Relevant bibliographies by topics / Circulating fluidized bed boiler

Academic literature on the topic 'Circulating fluidized bed boiler'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Circulating fluidized bed boiler"

1

Dudek, Agata, and Rafał Kobyłecki. "Influence of the Environment on the Operational Safety of a Fluidized Bed Boiler." System Safety: Human - Technical Facility - Environment 1, no. 1 (March 1, 2019): 678–83. http://dx.doi.org/10.2478/czoto-2019-0086.

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AbstractThe use of fluidized bed boilers in modern power engineering is a promising solution for clean and economically acceptable combustion of various fuels, including coal, biomass and waste, for the generation of electricity. The fluidized bed boilers are nowadays technically advanced and complex combustion facilities where all individual boiler elements are subjected to withstand continuous structural and thermal loads during their operation. Intensive loading of boiler elements can be quite easily linked with boiler operational safety and is quite often one of the main reasons for emergency shutdowns followed by necessary replacements of the damaged items. In case of industrial large-scale circulating fluidized bed boilers the frequency of unplanned shutdowns is also quite often affected by the hydrodynamics of the fluidized bed and some other parameters, such as the intensity of solids circulation, temperature, solids concentration, flue gas composition and velocity, solids accumulation and deposition, as well as the corrosion or erosion of heat transfer surfaces. The present paper briefly reports the results of authors investigation focused on the morphology and structure of some chosen elements (steel anchors) sampled from one of Polish circulating fluidized bed boilers. The anchors were degraded during boiler operation and lost their mechanical durability. In order to determine the reasons of anchors’ degradation chemical composition of the elements was determined with the use of a spark spectrometer SPECTROLAB and sample morphology was investigated with JEOL JSM-6610LV scanning microscope equipped with LaB6 cathode.
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Yan, Yi. "Analysis and Discussion on Burning Low Calorific Value Fuel of Circulating Fluidized Bed Boiler." E3S Web of Conferences 329 (2021): 01074. http://dx.doi.org/10.1051/e3sconf/202132901074.

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China's coal-dominated energy structure will not change in a short time. In order to implement the relevant national policies on energy conservation and emission reduction, it is a good response to adopt circulating fluidized bed boilers in coal-fired power stations. Circulating fluidized bed boiler adopts fluidized combustion, which has high reliability and high utilization rate because of its special combustion mode and particle recycling device. For the low calorific value inferior fuel which is difficult to burn in common boiler, CFB boiler also has certain adaptability and compatibility. In this background, this article with coal gangue as the representative of the inferior coal are discussed its application in the circulating fluidized bed boiler, the combustion process, boiler equipment and special fly ash produced by combustion is proposed that often appear in the three aspects of problems, and accordingly put forward the solution and optimization measures, provides reference for the actual process.
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Ma, Da Fu, and Xiao Hong Hao. "Status and Prospect of Large-Scale Circulating Fluidized Bed Boiler." Advanced Materials Research 516-517 (May 2012): 444–47. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.444.

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The paper is focused on the present situation and the development of large-scale circulating fluidized bed (CFB) boilers. Several developed technology of CFB such as supercritical and ultra supercritical pressure CFB boilers for power plants, oxy-fuel CFB boiler for CO2 capture and high-density circulating fluidized bed gasifier for advanced IGCC/IGFC are introduced in this paper.
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Basu, P., and P. K. Halder. "A New Concept for Operation of a Pulverized Coal Fired Boiler Using Circulating Fluidized Bed Firing." Journal of Engineering for Gas Turbines and Power 111, no. 4 (October 1, 1989): 626–30. http://dx.doi.org/10.1115/1.3240302.

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The feasibility of adapting existing pulverized coal fired boilers slated for life extension to circulating fluidized bed firing is examined by considering the case of a 150 MWe tangentially fired pulverized coal boiler. The proposed modifications call for a minimum of change in existing units. Thermal calculations are presented to show how heat absorption in different sections of the converted boiler can be matched to that in the pre-existing pulverized coal fired boiler. Data for two load conditions are presented to identify problems associated with low loads. Fuel flexibility in the converted circulating fluidized bed unit is shown by repeating the thermal calculations for coal washery rejects. It is concluded that the adoption of circulating fluidized bed firing is thermodynamically feasible.
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Kim, Seongil, Sangmin Choi, Jari Lappalainen, and Tae-Ho Song. "Dynamic simulation of the circulating fluidized bed loop performance under the various operating conditions." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 7 (March 27, 2019): 901–13. http://dx.doi.org/10.1177/0957650919838111.

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In a circulating fluidized bed boiler, the large thermal mass and flow characteristics of the solids strongly affect the transient response of the circulating fluidized bed loop temperature, which determines the heat transfer rate to steam flow. Therefore, it is essential to interpret the dynamic response of the solid behavior in the circulating fluidized bed loop for the stable and efficient operation of the circulating fluidized bed boiler. In this study, the dynamic simulation of the solid behavior along with the flue gas flow in a circulating fluidized bed loop was performed by applying the core-annulus approach for the solid-gas flow inside the furnace and selected models for other physical phenomena of the fluidized bed. The circulating fluidized bed loop of a commercial boiler was selected as the target system. Especially, the model simulates the characteristics of the solid behavior, such as the local solid mass distribution, and the solid flow inside the furnace and the circulating solid according to the various operating conditions. These aspects are difficult to measure and quantify in a real power plant. In this paper, the simulated furnace temperature behavior as the representative performance parameter of the circulating fluidized bed loop was discussed along with the qualitative operation experiences reported in the literature. The operating conditions include the feed rate of fuel and air, the particle size, the solid inventory and the solid circulation rate. Furnace temperature behavior was reproduced through the simulation for each operating case in the literature and was analyzed with the solid behavior along with the combustion rate and heat transfer rate of the circulating fluidized bed loop. The simulation enables quantitative evaluation of the effect of the solid behavior on the temperatures of the furnace and return part in the various operating conditions.
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Zhao, Bin, Jun Hao Li, Jing Quan Shen, and Guo Zhong Wang. "The Analysis on Circulating Fluidized Bed Boiler Heat Tube Failure." Advanced Materials Research 291-294 (July 2011): 1679–84. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1679.

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Boiler heat tube failure is a long-term technical problem plaguing the production of electricity. The research on how to prevent failure of boiler heat tubes has practical significance. In this paper, select the type of the Tangshan Dong fang power plant SG-490/13.8-M572 CFB boiler as the research object, part by pressure, failure type, and run-time statistics on the heat tubes failure of two boilers throught the collation and analysis on records, the basic rules of the failure are found out, statistics show that the water wall and super heater tubes explosion causes boiler shutdown time accounted for unplanned boiler shutdown time about 82%, small power generating capacity of about 11% of the total time. Finally, relevant technical strategies including improving maintenance quality and strengthening boilers regular inspection are proposed, the unplanned outage of units is radically reduced, and the safety and reliability of boiler operation is comprehensively improved.
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Cui, Lin Lin, Hua Lai, Xiao Qian Yu, and Ming Jie Qi. "Modeling and Simulation of Circulating Fluidized Bed Boiler Combustion System Based on Neural Network." Advanced Materials Research 706-708 (June 2013): 859–63. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.859.

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According to the multivariable coupling、 large time delay, non-linearity and time-varying and other difficulties of circulating fluidized bed boiler combustion system, a kind of control technology based on neural network to circulating fluidized bed boiler combustion system was presented. Actual parameter data of a paper mill in Kunming and neural network control principle were used in the establishment of a circulating fluidized bed boiler combustion system mathematical model and modified BP neural network algorithm training. Results of MATLAB simulation show that boiler combustion system control precision was effectively improved and good effects in production and application were got.
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Nie, Li, Jiayi Lu, Qigang Deng, Liming Gong, Dayong Xue, Zhongzhi Yang, and Xiaofeng Lu. "Study on the Uniformity of Secondary Air of a 660 MW Ultra-Supercritical CFB Boiler." Energies 15, no. 10 (May 14, 2022): 3604. http://dx.doi.org/10.3390/en15103604.

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Based on the field test of a 600 MW supercritical circulating-fluidized bed boiler, this paper optimizes the secondary air pipe layout scheme of a 660 MW ultra-supercritical circulating fluidized bed boiler with a similar furnace structure and carried out a numerical simulation on its air distribution uniformity. The secondary air box of the 660 MW ultra-supercritical circulating-fluidized bed boiler adopts a variable section design, and the secondary air branch pipe adopts a separate air inlet mode. The experimental results showed that the oxygen concentration was uniform near the rear wall, but all exhibited a “decrease–increase–decrease” profile along the horizontal line, which indicated that the trajectory of the secondary air jet was first in the shape of bending downward and then upward. To achieve a more uniform secondary air distribution for supercritical CFB boilers, further optimization of the layout of the bellows and branch pipes should be considered. Numerical results showed that the deviation rate of the internal and lower secondary air reached 17%, and there was optimization space for the secondary air branch pipe layout of the boiler. Its uniformity can be increased by adding valves and other measures. The velocity deviation of the secondary air of the 660 MW ultra-supercritical circulating-fluidized bed boiler can be within 3% by means of separate air supply and pipe diameter change, and better uniform air supply can be achieved to reduce the speed deviation by adding valves and adjusting the combustion.
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Liang, Yu Wen, Hui Song, and Yuan Xin Li. "Optimization Design of Limestone Conveyor System in Circulating Fluidized Bed Boiler." Applied Mechanics and Materials 602-605 (August 2014): 731–33. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.731.

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The qualities of the limestone conveyor system running directly affect the efficiency of circulating fluidized bed boiler combustion. Aiming at the problems of limestone conveyor system, this paper optimizes the design of the control system and the ring limestone fluidized bed boiler combustion control system networking, the use of configuration technology for real-time data control system to monitor and implement manual and automatic switching function. While improving the delivery system and improve the combustion efficiency of the boiler. For the circulating fluidized bed boiler combustion system provides a reference value.
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Huang, Yuansheng, Lijun Zhang, and Min Zhong. "Study on Coordination Control of Subcritical Circulating Fluidized Bed Units with Win-Win Source Network." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 3 (June 2019): 621–27. http://dx.doi.org/10.1051/jnwpu/20193730621.

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Aiming at the large delay and inertia characteristics of circulating fluidized bed units, a coordinated control method of circulating fluidized bed units under the CPS evaluation system of power grid is proposed. Firstly, starting from the power grid performance evaluation index CPS, the formation characteristics of regional control error ACE in the CPS index are analyzed. Then, according to the operation characteristics of circulating fluidized bed units, the feasibility of realizing the boiler-turbine-grid coordinated control system is revealed. Then, the switch controller based on the energy state of the boiler and the optimal controller based on CPS standard are designed to realize the boiler network. Finally, through simulation experiments, it is verified that the proposed control methods not only meets the requirements of power grid for unit evaluation better, but also takes into account the overall energy state of the boiler to improve the control performance of main steam pressure, and achieves the win-win control effect of circulating fluidized bed units and power grid.
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Dissertations / Theses on the topic "Circulating fluidized bed boiler"

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Karppanen, E. (Erkki). "Advanced control of an industrial circulating fluidized bed boiler using fuzzy logic." Doctoral thesis, University of Oulu, 2000. http://urn.fi/urn:isbn:9514255194.

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Abstract Circulating Fluidized Bed (CFB) boilers are widely used for multi-fuel combustion of waste and bio-fuels. When several non-homogeneous fuels, having varying heat values, are burned simultaneously, the boiler control system can be affected by various control challenges, especially since it is not feasible to reliably measure the energy content of the multi-fuel flow. In order to fulfill energy production needs and maintain the ability to burn low grade fuels, co-firing with high heat value fuels such as gas, oil or coal is needed. Fuzzy Logic Control (FLC) has been successfully used for solving control challenges, where operators' process expertise can be transformed into automation. Real life control objects are often non-linear because the dynamics change with the operating point, or there might be other essential non-linearities in the combustion process. The proposed fuzzy control applications were developed to solve control challenges the operators meet in daily operation of a 150 MW(th) CFB at Varenso Oy's (Stora Enso Oyj) K6 boiler in Varkaus Finland. Before implementing the applications in the fullscale boiler, they were tested at a 2 MW(e) pilot plant boiler at Foster Wheeler Energia Oy's Research Center in Karhula, Finland. According to the industrial experiments, the four applications (steam pressure control, compensation of fuel quality fluctuation, fuel-feed optimization and increased bed inventory monitoring) discussed in this thesis, showed satisfactory performance and various improvements to the boiler control were achieved. Fuzzy logic control was shown to be a notable tool to improve the multi-fuel CFB boiler control.
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Niva, L. (Laura). "Self-optimizing control of oxy-combustion in circulating fluidized bed boilers." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526221304.

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Abstract Energy production in combustion power plants is a significant source of anthropogenic carbon dioxide emissions. The targets of international climate agreements call for utilizing all available technologies to achieve rapid and cost-effective emission reductions. Carbon capture and storage is one of the possible technical solutions applied in combustion power plants. Circulating fluidized bed boilers have gained increasing popularity due to advantages in availability, emission control, fuel flexibility and option for using challenging fuels, and the possibility of using high-efficiency steam cycles. In the novel process of oxy-combustion, combustion air is replaced by a mixture of oxygen and recycled flue gas to facilitate the capture of carbon dioxide from the flue gas flow. Additional degrees of freedom become available for combustion control as the gas flow and composition can be controlled separately for fluidization and combustion purposes. In the research for this thesis, self-optimizing control was applied for the control structure design of a circulating fluidized bed boiler. Self-optimizing control offers a systematic tool for the early phases of control design, in which decisions have traditionally been made based on intuition, heuristics and previous experience. The self-optimizing control approach searches for controlled variables without a need for constant setpoint optimization when the process is affected by disturbances and implementation errors. Results presented in the thesis show that self-optimizing control can be applied in the control structure design of circulating fluidized bed combustion. A range of control structure alternatives were evaluated using steady-state approximations of a validated process model. For the novel oxy-combustion process, promising control structures were identified and could be dynamically demonstrated
Tiivistelmä Energiantuotanto polttovoimalaitoksissa on merkittävä hiilidioksidipäästöjen lähde. Kansainväliset ilmastotavoitteet edellyttävät kaikkien käytettävissä olevien teknologioiden hyödyntämistä päästövähennysten aikaansaamiseksi nopeasti ja kustannustehokkaasti. Hiilidioksidin talteenotto on yksi mahdollisista teknisistä ratkaisuista polttovoimalaitoksissa. Kiertoleijukattilat ovat saavuttaneet kasvavaa suosiota etuinaan hyvä käytettävyys, tehokas päästöjen hallinta, soveltuvuus erilaisten haastavienkin polttoaineiden hyödyntämiseen ja mahdollisuus tehokkaiden höyrykiertojen käyttöön. Uudessa happipolttoprosessissa palamisilma korvataan hapen ja kierrätetyn savukaasun seoksella, mikä mahdollistaa hiilidioksidin talteenoton savukaasuista. Kiertoleijupolton säädön kannalta vapausasteet lisääntyvät, sillä leijutukseen ja polttamiseen käytettävän kaasun määrää ja koostumusta voidaan säätää erikseen. Väitöstutkimuksessa käytettiin itseoptimoivaa säätöä kiertoleijukattilan säätörakenteiden suunnitteluun. Itseoptimoiva säätö tarjoaa systemaattisen menetelmän säätösuunnittelun alkuvaiheeseen, jossa päätöksenteko on perinteisesti tehty esimerkiksi intuition, heuristiikan ja aiempien ratkaisujen perusteella. Menetelmän tavoitteena on löytää säädettävät muuttujat, joiden asetusarvot eivät vaadi jatkuvaa optimointia, vaikka prosessiin vaikuttavat erilaiset häiriöt ja mittausvirheet. Väitöstutkimuksen tulokset osoittavat, että itseoptimoiva säätö soveltuu kiertoleijupolton säätörakenteiden suunnitteluun. Erilaisten säätörakenteiden toimivuutta arvioitiin käyttäen validoidun prosessimallin tasapainotilan approksimaatioita. Uudelle happipolttoprosessille löydettiin lupaavia säätörakenteita, joiden toimintaa voitiin demonstroida myös dynaamisesti
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Biruk, David D. "Neural Network Based Control of Integrated Recycle Heat Exchanger Superheaters in Circulating Fluidized Bed Boilers." UNF Digital Commons, 2013. http://digitalcommons.unf.edu/etd/470.

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The focus of this thesis is the development and implementation of a neural network model predictive controller to be used for controlling the integrated recycle heat exchanger (Intrex) in a 300MW circulating fluidized bed (CFB) boiler. Discussion of the development of the controller will include data collection and preprocessing, controller design and controller tuning. The controller will be programmed directly into the plant distributed control system (DCS) and does not require the continuous use of any third party software. The intrexes serve as the loop seal in the CFB as well as intermediate and finishing superheaters. Heat is transferred to the steam in the intrex superheaters from the circulating ash which can vary in consistency, quantity and quality. Fuel composition can have a large impact on the ash quality and in turn, on intrex performance. Variations in MW load and airflow settings will also impact intrex performance due to their impact on the quantity of ash circulating in the CFB. Insufficient intrex heat transfer will result in low main steam temperature while excessive heat transfer will result in high superheat attemperator sprays and/or loss of unit efficiency. This controller will automatically adjust to optimize intrex ash flow to compensate for changes in the other ash properties by controlling intrex air flows. The controller will allow the operator to enter a target intrex steam temperature increase which will cause all of the intrex air flows to adjust simultaneously to achieve the target temperature. The result will be stable main steam temperature and in turn stable and reliable operation of the CFB.
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Fusey, Isabelle. "A novel circulating fluidized bed." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25094.

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A novel type of circulating fluidized bed has been investigated and tested. While a conventional circulating fluidized bed unit consists of two vessels standing side by side - a fast bed operating at high gas velocity, and a slow bed which acts as a recycle vessel and operates at a much lower velocity - the novel design incorporates the two beds into a unique concentric arrangement. The inner column acts as the fast bed and the annular region acts as the slow bed. A baffle to separate the gas-solid mixture at the top of the inner column has been designed and tested. The baffle works reasonably well but design optimization is needed. Two types of air inlets for aeration of the insert have been tried: vertical and tangential. The vertical air inlet has been found to produce the highest solids circulation rates. Two types of solids have been investigated: polyvinyl chloride resin and cracking catalyst. The use of the heavier and smaller cracking catalyst particles resulted in higher circulation rates and greater solids hold-up in the inner column. The hydrodynamic behavior of the system has been studied using pressure and circulation flux measurements. The solids circulation flux, the axial pressure profile, and the absolute pressure inside the system are generally all strong functions of air velocity in both the inner and outer sections, solids inventory, type of particle, and type of air inlet.
Applied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate
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Huang, Yue. "Dynamic model of circulating fluidized bed." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4823.

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Thesis (Ph. D.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains ix, 133 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 103-114).
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Gogebakan, Yusuf. "Simulation Of Circulating Fluidized Bed Combustors." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607775/index.pdf.

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A dynamic mathematical model for simulation of atmospheric circulating fluidized bed combustors has been developed on the basis of first principles and empirical correlations. The model accounts for dense and dilute zone hydrodynamics, volatiles release and combustion, char particles combustion and their size distribution, and heat transfer from/to gas, particles, waterwalls and refractory. Inputs to the model include configuration and dimensions of the combustor and its internals, air and coal flows, coal analysis, all solid and gas properties, inlet temperatures of air, cooling water, and feed solids, size distribution of feed solids
whereas outputs include transient values of combustor temperatures, gas concentrations, char and inert hold-ups and their size distributions. The solution procedure employs method of lines approach for the governing non-linear partial differential equations and combined bisection and secant rule for non-linear algebraic equations. The initial conditions required for the model are provided from the simultaneous solution of governing equations of dynamic model with all temporal derivatives set to zero. By setting all temporal derivatives to zero, model can also be utilized for steady state performance prediction. In order to assess the validity and predictive accuracy of the model, it was applied to the prediction of the steady state behavior of Technical University of Nova Scotia 0.3 MWt CFBC Test Rig and predictions were compared with measurements taken on the same rig. Comparison of model predictions at steady state conditions revealed that the predictions of the model are physically correct and agree well with the measurements and the model is successful in qualitatively and quantitatively simulating the processes taking place in a circulating fluidized bed combustor.
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Courbariaux, Yann. "Heat transfer in a circulating fluidized bed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ46243.pdf.

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Redemann, Kai. "Ash management in circulating fluidized bed combustors." Aachen Shaker, 2008. http://d-nb.info/991096231/04.

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Wu, Richard Lap. "Heat transfer in circulating fluidized beds." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/31037.

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Heat transfer in circulating fluidized beds was studied in both a 7.3 m high, 152 x 152 mm square, pilot-scale combustor and a 9.3 m high, 152 mm ID transparent cold model unit. Results were obtained for particles of mean size 171-299 µm at superficial gas velocities from 4 to 9.5 m/s and for solids circulation rates up to 70 kg/m².s. For the combustor, results obtained by using membrane walls and a vertical tube as heat transfer surfaces show a strong influence of the cross-sectional area-averaged suspension density on time-averaged, length-averaged suspension-to-surface heat transfer coefficient. The influence of superficial gas velocity is found to be small. Radiation becomes significant at suspension temperatures higher than 400 C and at low suspension densities. Heat transfer coefficients were also found to vary with the lateral position of the tube. The vertical length of heat transfer surface is shown to be an important parameter, allowing seemingly discrepant published results to be reconciled. For the cold model unit, sudden and dramatic peaks in instantaneous heat transfer coefficients were measured using an instantaneous heat transfer probe. Simultaneous heat transfer and capacitance measurements suggest that these peaks are caused by the arrivals of particle strands at the heat transfer surface. Two-probe heat transfer measurements suggest the existence of a characteristic residence length for the strands at the wall in this column. A proposed heat transfer model, based on an overall core-annulus flow structure in the riser, and periodic formation, movement along the wall, and disintegration of strands in the annulus, gives reasonable agreement with a wide range of published data. It accounts successfully for the effects of heat transfer surface length and particle sizes. However, the effect of the heat transfer surface configuration on the flow pattern of particles must also be taken into account to give improved agreement with experimental data.
Applied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate
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Herbert, Peter M. "Hydrodynamic study of a downflow circulating fluidized bed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/NQ32310.pdf.

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Books on the topic "Circulating fluidized bed boiler"

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Basu, Prabir. Circulating Fluidized Bed Boilers. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3.

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A, Fraser Scott, ed. Circulating fluidized bed boilers: Design and operations. Boston: Butterworth-Heinemann, 1991.

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International, Conference on Circulating Fluidized Beds (2nd 1988 Compiègne France). Circulating fluidized bed technology II: Proceedings of the second international conference on circulating fluidized beds. Oxford: Pergamon, 1988.

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Nowak, Wojciech. A comprehensive study of the circulating fluidized bed. Częstochowa: Politechnika Częstochowska, 1989.

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International Conference on Circulating Fluidized Beds (2nd 1988 Compiègne, France). Circulating fluidized bed technology II: Proceedings of the Second International Conference on Circulating Fluidized Beds, Compiègne, France, 14-18 March 1988. Oxford, England: Pergamon Press, 1988.

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1946-, Basu Prabir, Horio Masayuki 1943-, and Hasatani Masanobu 1941-, eds. Circulating fluidized bed technology III: Proceedings of the Third International Conference on Circulating Fluidized Beds, Nagoya, Japan, 14-18 October 1990. Oxford: Pergamon Press, 1991.

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Valmari, Tuomas. Potassium behaviour during combustion of wood in circulating fluidised bed power plants. Espoo [Finland]: Technical Research Centre of Finland, 2000.

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1946-, Basu Prabir, Canadian Society for Chemical Engineering., Canadian Society for Mechanical Engineering., and Technical University of Nova Scotia. Centre for Energy Studies., eds. Circulating fluidized bed technology: Proceedings of the First International Conference on Circulating Fluidized Beds, Halifax, Nova Scotia, Canada, November 18-20, 1985. Toronto: Pergamon Press, 1986.

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Francisco, M. Disposal of pellitized circulating fluidized bed combustion products: Costain haul-back project. S.l: s.n, 1994.

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Hyppänen, Timo. An experimental and theoretical study of multiphase flow in a circulating fluidized bed. Lappeenranta: Lappeenranta University of Technology, 1989.

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Book chapters on the topic "Circulating fluidized bed boiler"

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Basu, Prabir. "Introduction." In Circulating Fluidized Bed Boilers, 1–15. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_1.

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Basu, Prabir. "Material Issues." In Circulating Fluidized Bed Boilers, 277–303. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_10.

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Basu, Prabir. "Operation and Maintenance Issues." In Circulating Fluidized Bed Boilers, 305–36. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_11.

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Basu, Prabir. "Hydrodynamics." In Circulating Fluidized Bed Boilers, 17–47. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_2.

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Basu, Prabir. "Heat Transfer." In Circulating Fluidized Bed Boilers, 49–87. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_3.

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Basu, Prabir. "Combustion." In Circulating Fluidized Bed Boilers, 89–119. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_4.

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Basu, Prabir. "Emissions." In Circulating Fluidized Bed Boilers, 121–53. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_5.

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Basu, Prabir. "Design Considerations." In Circulating Fluidized Bed Boilers, 155–99. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_6.

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Basu, Prabir. "Gas–Solid Separators." In Circulating Fluidized Bed Boilers, 201–27. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_7.

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Basu, Prabir. "Design of CFB Components." In Circulating Fluidized Bed Boilers, 229–53. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06173-3_8.

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Conference papers on the topic "Circulating fluidized bed boiler"

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Yue, Guangxi, Junfu Lu, Hai Zhang, Hairui Yang, Jiansheng Zhang, Qing Liu, Zheng Li, Eric Joos, and Philippe Jaud. "Design Theory of Circulating Fluidized Bed Boilers." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78134.

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Studies on circulating fluidized bed (CFB) boilers have being conducted at the Tsinghua University (TH) for about two decades and much of works are done to link the fundamentals with practical application. A full set of design theory was developed and some key elements of this theory are presented in this paper. First, a classification of state of the solid-gas two-phase flow in CFB boiler is given. TH’s studies validated that a CFB boiler can be generally described as the superposition of a fast bed in the upper part with a bubbling bed or turbulent bed in the bottom part. A concept model of material balance for the open system of CFB boiler was developed and later improved as a more comprehensive 1-D model taking ash formation, particle attrition and segregation in bed into account. Some results of the models are discussed. Then the concept of State Specification of a CFB boiler is defined and discussed. The State Specification is regarded as the first step to design a CFB and a base to classify different style of CFB boiler technologies for various CFB boiler manufacturers. The State Specification adopted by major CFB boiler makers is summarized and associated importance issues are addressed. The heat transfer model originally developed by Leckner and his coworkers is adopted and improved. It is further calibrated with experimental data obtained on the commercial CFB boiler measurements. The principle, improvements and application of the model are introduced. Some special tools developed for heat transfer field test are also given. Also, combustion behaviors of char and volatile content are studied, and the combustion difference between a CFB boiler and a bubbling bed is analyzed. The influence of volatile content and size distribution is discussed. The concept of vertical distribution of combustion and heat in CFB boiler furnace is introduced and discussed as well. In the last, the suggested design theory of CFB boiler is summarized.
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Liu, Yanpeng, Beijing Zhong, and Shaohua Li. "Exergy analysis of circulating fluidized bed boiler." In 2015 IEEE 10th Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2015. http://dx.doi.org/10.1109/iciea.2015.7334241.

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Chen, Han-Ping, Xian-Hua Wang, Shi-Hong Zhang, De-Chang Liu, Yu-Hua Lai, Jian-Xin Tian, Shao-You Jiang, Shao-Peng Wei, Jian-Hui Liu, and Ming-Ge Huang. "Retrofitting 25T/h Pulverized Coal-Fired Boiler Into 35T/h Circulating Fluidized Bed Boiler for Burning Mixture of Coal and Bagasse." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78041.

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In China, there are a large number of pulverized coal-fired industrial boilers, whose steam capacities are usually relatively small. These boilers can burn only high-grade coal and have low combustion efficiency. Furthermore, the combustion emissions, such as SO2 and NOx, pollute the environment severely. Therefore it is very important and urgent to adopt economically efficient and environmentally friendly technologies to retrofit these boilers. At the same time, there are many industrial wastes, such as bagasse, wood waste, rubbish, petroleum coke and so on, need burning disposal in China. Fluidized bed combustion technology is a kind of clear combustion technology, which has many advantages, such as excellence fuel flexibility, high combustion efficiency, low pollutant emission and good turndown capability etc. So, adopting fluidized bed combustion technology, retrofitting pulverized coal-fired boiler into fluidized bed boiler can realize pure burning various wastes or co-firing with coal, which should have great economic benefits and social benefits. And the application prospect of the method is also extensive. The State Key Laboratory of Coal Combustion has successfully retrofitted a 25t/h pulverized coal-fired boiler into circulating fluidized bed boiler with in-bed tubes and downward exhaust cyclone. The retrofitted boiler can burn mixture of coal and bagasse and the steam capacity reaches 35t/h. This paper presents the retrofitting measures and the operation status of the boiler after retrofitting.
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Myo¨ha¨nen, Kari, Timo Hyppa¨nen, Jouni Miettinen, and Riku Parkkonen. "Three-Dimensional Modeling and Model Validation of Circulating Fluidized Bed Combustion." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-048.

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This paper presents a three-dimensional, steady state combustion model for a circulating fluidized bed (CFB) furnace and several calculation cases which have been used for the validation of the model. The model includes essential submodels to describe the complex combustion process in a circulating fluidized bed boiler. These include the hydrodynamics of the bed, devolatilization of fuel, combustion of char, combustion of hydrocarbons, carbon monoxide and hydrogen, calcination and sulfation, fragmentation and attrition of solids, heat transfer, overall mass balance of the furnace, and three-dimensional balance equations based on the finite volume method. The code was initially developed in 1989, and it has been updated and improved over the years as new methods and new information have become available. The model is used for increasing process knowledge and for studying such phenomena inside the furnace which are often difficult or impossible to study by direct measurements. The knowledge obtained is then applied to optimize boiler design and process performance in terms of efficiency, economy and environmental issues. Reliable experiments and measurements in commercial boilers are used for the validation of the model and for tuning the model parameters. For the validation of a three-dimensional model, extensive profile measurements of the various parts of the furnace are required. This paper presents validation studies for an 80 MWth hot water boiler burning bituminous coal and for a 235 MWe subcritical boiler burning lignite. The measurements with these units included profile measurements of heat flux, pressure, temperature and gas composition under different process conditions. The model was tuned according to the measurements and used for the prediction of the heat flux profile of a large scale supercritical CFB boiler.
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Wu, Zhengshun, Hanping Chen, Dechang Liu, Jie Wang, Chuangzhi Wu, and Haitao Huang. "A Study of Operation Performance of Circulating Fluidized Bed Combustion Boiler." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-001.

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The operation performance of circulating fluidized bed combustion (CFBC) boiler was studied in this paper. The experimental results indicate that the load of CFB boiler has linear relation with bed temperature and bed material height of operation. By multiple regression analysis, the relation of the load of CFB boiler with bed temperature and bed material height of operation can be expressed as a formula. The suitable temperature and the bed material height corresponding to the load of CFB boiler can be found using the formula; the problem of the boiler to be blindly operated can be reduced in practice.
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Skrifvars, Bengt-Johan, Patrik Yrjas, Tor Laure´n, Mikko Hupa, and Martin Dittrich. "The A˚bo Akademi Database: Ash Behavior Measurements in Full-Scale Boilers." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78140.

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This poster paper presents an overview of the A˚bo Akademi full-scale boiler ash behavior measurement database. The database contains data from some 20 full-scale boiler measurement campaigns during which the ash behavior in the boiler has been monitored identically. The measurements have been done in 3 different bubbling fluidized bed boilers and 2 circulating fluidized bed boilers during 11 different campaigns. For comparison data from 2 pulverized fuel fired boilers as well as from 2 grate fired boilers have also been included. The data collection includes conventional analyses of the fuels or fuel mixes used during the measurements, ash deposition measurements performed with the air-cooled probe technique, chemical analyses of the collected deposits (front and back side separately, chemical analyses of the boiler fly ashes, and recordings of chosen relevant boiler operation parameters such as boiler load, air-distribution, and flue gas temperatures. The poster paper presents ash deposition data, so called Rate-of-build-up values (RBU, g/m2h) as a function of fuel mixes, probe surface temperatures and boiler type. The poster also presents compositional data of the collected deposits such as the chlorine content as a function of fuel mix and probe surface temperature.
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Basu, P., A. Dutta, and L. Miller. "An Intelligent Tool for Evaluating Bids for Circulating Fluidized Bed Boilers." In 17th International Conference on Fluidized Bed Combustion. ASMEDC, 2003. http://dx.doi.org/10.1115/fbc2003-153.

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Circulating fluidized bed (CFB) boilers have gained wide scale acceptance in both the process and utility industries in sizes up to 300 MWe. Their ability to burn opportunity fuels such as petroleum coke has carved out a special niche for CFB boilers in the energy market. Presently more than 600 CFB boilers are either in operation or under construction worldwide. Boiler purchasers have a much wider choice of available designs and manufacturers to choose from, making bid selection more difficult. Even with performance guarantees in place, it is prudent for buyers to evaluate proposed designs in order to fully appreciate the various options and to identify potential problems. CFBCAD© is an intelligent software developed by extensive research into design methodologies for CFB boilers and critical analysis of the design of many CFB boilers manufactured by different companies around the world. The model used considers user-inputted fuel specifications and steam conditions, and performs sizing calculations for the furnace and heat transfer surfaces. A variety of heat transfer surface configurations are available for analysis. It has been used to evaluate the design of some operating plants and to try and predict deviations from design parameters.
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Gao, Jian-Qiang, Chao-Bo Du, and Yin-Song Wang. "Analysis on the Bed Temperature Characteristics of 450t/h Circulating Fluidized Bed Boiler." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78087.

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Normal and steady bed temperature provides a basis for the stabilization and safe operation of the circulating fluidized bed boiler (CFBB) unit. Because the bed temperature is affected by many operating factors, it often fluctuates unexpectedly. The bed temperature auto-control system seldom could be put into service during the operation of large capacity CFBB unit. On the basis of operation data of a commercial 450t/h CFBB, which is the first biggest CFBB made in China, the authors systematically analyze the main factors which influence the changes of bed temperature, such as fuel supply rate, air supply rate, oxygen concentration, dense zone height and the unit load et al. The record of the operation data show that the lag of the bed temperature is common phenomenon while fuel supply is changed, and the lag time varies with the fuel supply time, fuel supply operating mode and fuel supply rate; Coal quality and its grain diameter spectrum also have notable influence on bed temperature; Primary air rate has different influences on bed temperature at different operating conditions, and its adjustment range on bed temperature is limited while it is used to bed temperature control; The change of oxygen concentration can reflect combustion conditions in the furnace; The change of dense zone height will result in the change of bed temperature, so the adjustment of fluidization air rate is necessary; Bed temperature is one of the main factors which lead to the change of boiler load. At last, regulating rules on bed temperature control are analyzed and summarized. The conclusions can provide references for the design of control system and safe operation of CFBB unit.
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Wang, Yu, Junfu Lu, Hairui Yang, Xinmu Zhao, and Guangxi Yue. "Measurement of Heat Transfer in a 465t/h Circulating Fluidized Bed Boiler." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78050.

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The study of heat transfer and thermal boundary layer in the combustor of a circulating fluidized bed (CFB) is important to the boiler design and operation. Both heat transfer coefficient between the solid-gas flow and the water-wall and the thickness of thermal boundary layer are key data to determine the amount and layout of the tube walls in a CFB furnace. A series of experiments was conducted on a 465t/h commercial CFB boiler, which operated at bed temperature between 850 and 900°C, and at superficial gas velocity between 5.2 to 5.9m/s. Local bed to water wall heat transfer coefficients and temperature profiles near the wall were measured at a set of test ports at different heights of the sidewall. In the same time, the local solid bulk density near the wall was also measured. Special tools such as heat flux probe, solid bulk density sampling probe and temperature probe were developed for the experiments and their structures were introduced. The experimental results were compared with the data from previous studies. Theoretical analysis of the factors that play important role in heat transfer in a CFB boiler was also performed. The relationship between heat transfer and thermal boundary layer was also discussed. Furthermore, a simple model correlating the local heat transfer coefficients with bulk density was developed.
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Zhao, Xinmu, Junfu Lu, Jianhua Yang, Qingguo Zhang, Fengliang Dong, Long Yu, Zhongming Yang, and Guangxi Yue. "Operational Performance and Optimization of a 465t/h CFB Boiler in China." In 18th International Conference on Fluidized Bed Combustion. ASMEDC, 2005. http://dx.doi.org/10.1115/fbc2005-78051.

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In the last three years in China, more than 80 units of 135MWe circulating fluidized bed (CFB) boilers were ordered, and about two dozens of them have been put into operation. So far, the experience and performance evaluation of the boilers with such large capacity are very limited. A series of cold and hot tests were carried out on the boiler in order to optimize the operation and provide more information to the future design. The influence of coal properties, bed material fluidization, air distribution, bed temperature and pressure drop on the boiler performance such as carbon content in fly ash was assessed and discussed. Some problems of the boiler, including the bottom ash system, milling system, abrasion of the heating surface in the furnace, refractory stability, and exhaust fuel gas temperature are reported and suggestions are given for the future improvement and design.
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Reports on the topic "Circulating fluidized bed boiler"

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Nsakala ya Nsakala and Gregory N. Liljedahl. GREENHOUSE GAS EMISSIONS CONTROL BY OXYGEN FIRING IN CIRCULATING FLUIDIZED BED BOILERS. Office of Scientific and Technical Information (OSTI), May 2003. http://dx.doi.org/10.2172/825796.

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Miller, Bruce G., Sharon Falcone Miller, Robert Cooper, Douglas Donovan, John Gaudlip, Matthew Lapinsky, William Serencsits, Neil Raskin, Dale Lamke, and Joseph J. Battista. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), March 2001. http://dx.doi.org/10.2172/788934.

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Miller, Bruce G., Sharon Falcone Miller, Robert Cooper, Douglas Donovan, John Gaudlip, Matthew Lapinsky, William Serencsits, Neil Raskin, and Dale Lamke. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/792060.

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Bruce G. Miller, Sharon Falcone Miller, Robert Cooper, Douglas Donovan, John Gaudlip, Matthew Lapinsky, William Serencsits, Neil Raskin, and Dale Lamke. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/808550.

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Bruce G. Miller, Sharon Falcone Miller, Robert Cooper, Douglas Donovan, John Gaudlip, Matthew Lapinsky, and William Serencsits. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/808551.

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Bruce G. Miller, Sharon Falcone Miller, Robert Cooper, Douglas Donovan, John Gaudlip, Matthew Lapinsky, William Serencsits, Neil Raskin, and Tom Steitz. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), October 2002. http://dx.doi.org/10.2172/808552.

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Miller, Bruce G., Sharon Falcone Miller, Robert Cooper, Douglas Donovan, John Gaudlip, Matthew Lapinsky, William Serencsits, Neil Raskin, and Tom Steitz. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), July 2002. http://dx.doi.org/10.2172/799759.

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Bruce G. Miller and Curtis Jawdy. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), October 2000. http://dx.doi.org/10.2172/774491.

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Miller, B. G., S. F. Miller, C. Jawdy, R. Cooper, D. Donovan, and J. J. Battista. Feasibility analysis for installing a circulating fluidized bed boiler for cofiring multiple biofuels and other wastes with coal at Pennsylvania State University. Office of Scientific and Technical Information (OSTI), December 2000. http://dx.doi.org/10.2172/774908.

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Bruce G. Miller, Sharon Falcone Miller, Robert Cooper, John Gaudlip, Matthew Lapinsky, Rhett McLaren, William Serencsits, Neil Raskin, Tom Steitz, and Joseph J. Battista. FEASIBILITY ANALYSIS FOR INSTALLING A CIRCULATING FLUIDIZED BED BOILER FOR COFIRING MULTIPLE BIOFUELS AND OTHER WASTES WITH COAL AT PENN STATE UNIVERSITY. Office of Scientific and Technical Information (OSTI), March 2003. http://dx.doi.org/10.2172/820032.

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