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Дисертації з теми "Coal Combustion"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 25 липня 2025

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1

Bend, Stephen Leonard. "Coal characterisation and combustion." Thesis, University of Newcastle Upon Tyne, 1989. http://hdl.handle.net/10443/361.

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There are three related studies within this thesis that examine the relationships between the properties of coals and the characteristics of the chars produced during rapid pyrolysis in a laboratory based Entrained Flow Reactor (EFR) which simulates the rapid rates of heating (104 to 105 °C s-1 ) typical of pulverised fuel boilers. The first study, using a suite of nine coals, investigates the influence of coal rank upon the generation of specific types of char, their respective physical and structural characteristics and their relative combustabilities. The second study, using a suite of twen

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2

Harding, Andrew W. "Environmental aspects of coal combustion." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360331.

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3

Pourkashanian, M. "The combustion of residual fuel oil, coal and coal slurries." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380819.

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4

Cavallo, Marincola Fabrizio. "Large eddy simulation of coal combustion." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/34316.

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In this work an in-house code for large-eddy simulations of coal combustion is developed and tested, with a special focus on the issue of modelling radiative heat transfer effects inside a furnace. An Eulerian-Lagrangian approach is used to describe the continuous gas phase and the discrete particle phase, with a two-way coupling between the two phases (implemented by another group member). The radiative transfer equation is solved using the discrete ordinates method, testing several different angular and spatial discretisation schemes. The spectral properties of the participating media are ap

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5

Hosin, Alyass Azzat. "Fiber reinforced coal combustion products concrete /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1342743231&sid=11&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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6

Megalos, Nikolaos Pandelis. "Coal combustion in precessing jet flames /." Title page, table of contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phm496.pdf.

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7

Le, Manquais Katherine. "Combustion enhancing additives for coal firing." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582090.

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Opportunities exist for effective coal combustion additives that can reduce the carbon content of pulverised fuel ash to below 6%, thereby improving the efficiency of low NOx burners and making the ash saleable for filler/building material applications. However, catalytic performance under pulverised fuel boiler conditions has received relatively little consideration. For the first time, the research set out in this thesis systematically compares the reactivity of catalysed and uncatalysed bituminous coal samples during combustion in a drop tube furnace (DTF) and a thermogravimetric analyser (

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8

Munir, Shahid. "Co-combustion of biomass with coal." Thesis, University of Leeds, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531610.

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9

Hirji, Karim Ahmedali Abdulla. "Combustion measurements in pulverised coal flames." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38035.

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10

Messig, Danny. "Numerical simulation of pulverized coal combustion." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-228707.

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Die Arbeit befasst sich mit der Flamelet Modellierung für die Verbrennung von Kohlenstaub. Dabei liegt der Fokus sowohl auf der detaillierten Betrachtung der Gasphasenchemie als auch auf der Interaktion der Kohle mit der Gasphase. Ziel der Arbeit ist die Entwicklung einer Methode für die Simulation großtechnischer Kohlestaubfeuerungen. Die energetische Umsetzung von Kohle läuft in drei wesentlichen Schritten ab: Verdampfung der Feuchtigkeit, Ausgasung der Kohle (Pyrolyse) und schließlich der Koksabbrand. Da die Struktur der Kohle als fossiler Brennstoff hoch komplex ist, existieren viele prädi

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11

Cai, Haiyong. "Fast pyrolysis of coals and char characterisation in relation to pulverised coal combustion." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337707.

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12

Kwong, Chi Wai. "Effect of co-combustion of coal and biomass on combustion performance and pollutant emissions /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?MECH%202005%20KWONG.

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Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2005.<br>"Sponsored by: CLP Research Institute." "HKUST project no.: CLPRI02/03.EG01." Includes bibliographical references (leaves 76-83). Also available in electronic version.

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13

Lapwood, Kevin John. "The combustion mechanisms of coal slurry fuels." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/842769/.

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Анотація:

The formation and subsequent burnout behaviour of coal slurry fuel chars has been studied using a suspended single droplet technique and solid sampling techniques in large turbulent diffusion flames. Both these techniques yielded comparable results on the structure of carbonaceous residues from a range of coal slurry fuels containing coals of different rank, size and concentration. The structure and burnout behaviour of all the fuels tested was dependant on coal rank, particle size, and concentration, although these variables did not always produce the same differences in behaviour in coal-oil

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14

Beck, N. C. "The early stages of pulverised coal combustion." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372642.

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15

Prassas, Ilias. "Combustion of pulverised coal in swirl burners." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286343.

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16

Burchfield, Nicole Ashley. "Narrow Angle Radiometer for Oxy-Coal Combustion." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8423.

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Анотація:

A new method of power production, called pressurized oxy-fuel combustion, burns coal with CO2 and oxygen, rather than air, bringing us closer to the end goal of developing zero emission coal-fired utility boilers. However, high-pressure, high-temperature systems such as these are under-studied, and their behavior is difficult to measure. An accurate model for previously untested conditions requires data for validation. The heat release profile of flames and their radiative intensity is one of the key data sets required for model validation of an oxy-coal combustion system. A radiometer can be

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17

Wan, Ab Karim Ghani Azlina. "Co-combustion of biomass fuels with coal in a fluidised bed combustor." Thesis, University of Sheffield, 2006. http://etheses.whiterose.ac.uk/14891/.

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Co-combustion of biomass with coal has been investigated in a 0.15 m diameter and 2.3 m high fluidised bed combustor under various fluidisation and operating conditions. Biomass materials investigated were chicken waste, rice husk, palm kernel shells and fibres, refuse derived fuel and wood wastes. These were selected because they are produced in large quantities particularly in the Far East. The carbon combustion efficiency was profoundly influenced by the operating and fluidising parameters in the decreased following order: fuel properties (particle size and density), coal mass fraction, flu

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18

Garba, Mohammed Umar. "Prediction of ash deposition for biomass combustion and coal/biomass co-combustion." Thesis, University of Leeds, 2012. http://etheses.whiterose.ac.uk/4373/.

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In this thesis, a model that couples a reduced alkali kinetic mechanism for alkali sulphate formation during biomass combustion with an ash deposition model using computational fluid dynamics (CFD) techniques has been presented. Starting with a detailed gas-phase kinetic mechanism for the alkali chemistry, a systematic reduction procedure has been performed using a sensitivity analysis to reduce the reaction mechanism to a level that can be implemented into a CFD calculation. An ash deposition model that takes into consideration the ash-sticking probability and the condensation of potassium sa

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19

Ejesieme, Obialo Vitus. "Evaluating the effect of microalgae biomass on the combustion of coal." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020641.

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In this work the combustion characteristics of coal, charcoal, microalgae biomass and blends between these three components were evaluated by means of non-isothermal thermogravimetry. Blends between coal, charcoal and microalgae biomass were made according to the specifications of a D-optimal mixture design so as to be able to model interactions between the three components with maximum precision despite multiple constraints built into the design. These constraints specified that coal can have a minimum value of 70 mass percent in any blend, while microalgae can have a maximum value of 20 mass

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20

Gallagher, Neal Benjamin. "Alkali metal partitioning in a pulverized coal combustion environment." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185896.

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Анотація:

Fouling, slagging, corrosion, and emission of submicron particulate from pulverized coal combustors have been linked to vapor alkali. Size segregated fly ash samples extracted from a 17 kW down-fired pulverized coal combustor showed strong evidence of alkali vaporization. The fraction of sodium in sizes smaller than 0.65 μm (f(8A)) showed a correlation with acid soluble sodium divided by total silicates in the parent coal. Addition of silicates to coal reduced f(8A) for sodium. Potassium existing primarily in the mineral matter, did not show a similar correlation, but f(8A) for potassium did c

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21

Punjak, Wayne Andrew. "High temperature interactions of alkali vapors with solids during coal combustion and gasification." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184599.

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The high temperature interactions of alkali metal compounds with solids present in coal conversion processes are investigated. A temperature and concentration programmed reaction method is used to investigate the mechanism by which organically bound alkali is released from carbonaceous substrates. Vaporization of the alkali is preceded by reduction of oxygen-bearing groups during which CO is generated. A residual amount of alkali remains after complete reduction. This residual level is greater for potassium, indicating that potassium has stronger interactions with graphitic substrates than sod

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22

West, Richard D. "NEW APPROACHES FOR MITIGATING ENVIRONMENTAL CONCERNS ASSOCIATED WITH COAL AND COAL COMBUSTION PRODUCTS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/dissertations/511.

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Currently, coal combustion plays an important role in meeting the energy needs of the United States. It is expected that the effective utilization of coal will be crucial for attaining energy independence for the nation in the next 25 to 30 years, if not longer. The United States burns about 20% of the world's annual coal production, second only to China. Strikingly, there are 200-300 more years of burn at our current rate of consumption, considering our massive coal reserves. Almost half of our electricity comes from coal power. Although coal is a fossil fuel that will become more and mo

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23

Puchakayala, Madhu Babu. "Mercury emission behavior during isolated coal particle combustion." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1153.

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24

Zhao, Jiansheng. "Coal combustion in spouted and spout-fluid beds." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26347.

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This study of coal combustion was carried out in a half-column spout-fluid bed combustor, in which Forestberg coal, a sub-bituminous Alberta coal, was burned in inert beds of sand. The combustor consists of a half cylindrical stainless steel column of 0.152 m I. D. and 1.06 m long, a half cylindrical cone fitted with an inlet orifice of 15.9 mm and a perforated plate as distributor surrounded by a plenum chamber, and a flat stainless steel panel with quartz glass windows. Aspects studied included hydrodynamic and combustion patterns, axial and radial temperature profiles, axial oxygen concent

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25

Allen, Deborah. "The removal of gaseous pollutants during coal combustion." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335690.

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26

Zebian, Hussam. "Multi-variable optimization of pressurized oxy-coal combustion." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67808.

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Анотація:

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 81-82).<br>Simultaneous multi-variable gradient-based optimization with multi-start is performed on a 300 MWe wet-recycling pressurized oxy-coal combustion process with carbon capture and sequestration. The model accounts for realistic component behavior such as heat losses, steam leaks, pressure drops, cycle irreversibilities, and other technological and economical considerations. The optimization study involves 16 var

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27

Shaw, David William. "Determination of global kinetics of coal volatiles combustion." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1346770278.

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28

Varol, Murat. "Combustion And Co-combustion Of Olive Cake And Coal In A Fluidized Bed." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607182/index.pdf.

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In this study, combustion performances and emission characteristics of olive cake and olive cake+coal mixture are investigated in a bubbling fluidized bed of 102 mm inside diameter and 900 mm height. The average particle sizes of coal and olive cake used in the experiments were 1.57 mm and 1.52 mm, respectively. Flue gas concentrations of O2, CO, SO2, NOx, and total hydrocarbons (CmHn) were measured during combustion experiments. Operational parameters (excess air ratio, secondary air injection) were changed and variation of pollutant concentrations and combustion efficiency with these operati

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29

Dhungel, Bhupesh [Verfasser]. "Experimental Investigations on Combustion and Emission Behaviour During Oxy-Coal Combustion / Bhupesh Dhungel." Aachen : Shaker, 2010. http://d-nb.info/1084536072/34.

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30

Wang, Muh-Rong. "Mechanisms and performance of coal burning Rijke type pulsating combustors." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/13032.

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31

Vicente, Annalisa Sarga. "Assessing different coal combustion residue backfill scenarios in opencast coal mines, Mpumalanga, South Africa." University of Western Cape, 2020. http://hdl.handle.net/11394/7853.

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>Magister Scientiae - MSc<br>Coal-fired power stations produce large volumes of coal combustion residues (CCRs), which are disposed of in hold ponds or landfill sites. These ash storage facilities are limited in space and are approaching the end of their capacities, thus additional land is required for extensions. If new land is not sourced, power plants will be forced to cease operations, resulting in increased expenditure costs and environmental liability. A proposed disposal solution is to backfill opencast coal mines with CCR monoliths. However, there is limited knowledge on the hydr

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32

Makgato, Seshibe Stanford. "Microbial Desulphurization of Combustion Coal and Environmental Control in Carbonization Coal : Emissions Reduction Techniques." Thesis, University of Pretoria, 2020. http://hdl.handle.net/2263/78953.

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Coal use in electricity generation has attracted much attention recently mainly due to the sector been identified as the main source of sulphur dioxide (SO2) emissions globally. The combustion of coal releases sulphur dioxide emissions into the atmosphere that create air pollution and cause harmful effects on the ecosystem. In the current study, biodesulphurization of Waterberg steam coal was investigated using a bacterial consortium isolated from coal. Coal samples were obtained from the coal feed into the power plant mills, by auto sampling equipment. Coal samples with various particle size

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33

Ribeiro, Natália da Silva [UNESP]. "Estudo termogravimétrico da combustão e oxicombustão de misturas carvão mineral-biomassa." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/149903.

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Анотація:

Submitted by NATALIA DA SILVA RIBEIRO null (nsribeiro2@gmail.com) on 2017-03-21T14:14:32Z No. of bitstreams: 1 Defesa Natalia_Final..pdf: 3776400 bytes, checksum: 4147b87ccc01a8c95a9e60c44f70613b (MD5)<br>Rejected by Luiz Galeffi (luizgaleffi@gmail.com), reason: Solicitamos que realize uma nova submissão seguindo a orientação abaixo: O arquivo submetido está sem a ficha catalográfica. A versão submetida por você é considerada a versão final da dissertação/tese, portanto não poderá ocorrer qualquer alteração em seu conteúdo após a aprovação. Corrija esta informação e realize uma nova

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34

No, Soo Young. "Processes involved in coal combustion in non-slagging cyclone combustors." Thesis, Cardiff University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316386.

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35

Cheng, Chin-Min. "Leaching of coal combustion products field and laboratory studies /." Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133195856.

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36

Bibrzycki, Jakub [Verfasser]. "Investigations of coal particle combustion and gasification / Jakub Bibrzycki." Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2015. http://d-nb.info/1070571792/34.

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37

Malik, Abdullah A. "A study of coal combustion using a rotating retort." Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315571.

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38

Trivett, G. S. "Combustion of coal/water slurry in a fluidized bed." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371453.

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39

Zeng, Taofang 1963. "Transformation of iron and trace elements during coal combustion." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9971.

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40

Franchetti, Mario Alberto Benjamin. "Large eddy simulation of air and oxy-coal combustion." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/32148.

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Анотація:

The main aim of the present work is to investigate the applicability of Large Eddy Simulations to pulverised coal combustion. The Navier-Stokes equations that describe an incompressible tur- bulent reactive flow are presented, with a source term which ac- counts for the effect of the coal particles on the gas phase. Both a Eulerian and Lagrangian approach are presented to describe the coal particles motion and their heat exchange with the gas phase. The main processes that characterise pulverised coal combustion: devolatilisation, volatile combustion and char combustion are described and the m

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41

Makhadmeh, Leema al. "Coal pyrolysis and char combustion under oxy-fuel conditions." Aachen Shaker, 2009. http://d-nb.info/996033009/04.

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42

Bulusu, Sowmya. "Remediation of abandoned mines using coal combustion by-products." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2992.

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Анотація:

Thesis (M.S.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Dept. of Civil and Environmental Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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43

Zailini, Ramlan. "Pulverised coal combustion in high CO₂ oxygen-rich environments." Thesis, University of Leeds, 2007. http://etheses.whiterose.ac.uk/4418/.

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Анотація:

Experiments on pulverised coal combustion in air and 02/C02 mixtures of various molar ratios, were conducted in a 20 kW-rated, down-fired furnace equipped with a single pulverised fuel (pt) burner, which was designed for the laboratory-scale experimental studies on coal combustion in air. In coal-02/C02 combustion tests, all the oxidants and fuel were delivered into the furnace with the same configurations as those in the coal-air combustion firing tests. In each test, the coal firing rate was fixed, and the furnace stoichiometric ratio was fixed at SR=1.20. Seven bituminous coals with fuel ra

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44

Kubacki, Michal Lukasz. "Co-pyrolysis and co-combustion of coal and biomass." Thesis, University of Leeds, 2007. http://etheses.whiterose.ac.uk/274/.

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Анотація:

Sustainability, security of supply, and diversity, as well as economic competitiveness are key components of energy policy. There is increasingly stringent legislation on the environmental impact of energy production, and there is growing pressure to reduce not just NOx and SOx emissions, but also C02 emissions. For both heating and electricity production it is likely that the plants will need to be fuel-flexible and could use one or more of several different feedstocks, for example coal and biomass. When coal is co-utilized with biomass there is added attractiveness because the biomass is C02

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45

Seames, Wayne Stewart. "The partitioning of trace elements during pulverized coal combustion." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284196.

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Анотація:

The environmental impact resulting from the release of trace elements during coal combustion is an important issue for the coal-fired electric utility industry. Trace elements exit the combustor by partitioning between the flue gas and the fly ash particles. A comprehensive study has been conducted to investigate the mechanisms governing the partitioning of trace elements during pulverized coal combustion. The behavior of seven trace elements (arsenic, selenium, antimony, cobalt, cesium, thorium, and cerium) in six pulverized coals were studied under commercially relevant conditions in a well-

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46

Ogden, Gregory E. "Pulverized coal combustion: Flame attachment and nitrogen oxide emissions." Diss., The University of Arizona, 2002. http://hdl.handle.net/10150/289822.

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To fully utilize coal as a long-term energy source, pollution prevention technologies must be developed to mitigate the negative environmental and health impacts of coal combustion. NOₓ emissions are of particular concern due to their role in forming ground-level ozone, photochemical smog, fine particulates and acid rain. A systematic evaluation of near-flame aerodynamics was conducted to determine how burner operating parameters and oxygen partial pressure influence flame attachment and coal ignition, two properties essential for proper low NOₓ burner operation. A laboratory scale (17kW) 2m t

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47

Scotto, Mark Vincent 1960. "A mechanism for the oxidation and fragmentation of a char particle." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276699.

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A mechanism for the oxidation and fragmentation of a char particle was developed. Qualitative agreement between the model simulations and experimental data observed in the literature, is found for the higher gas temperatures (1700K). However fundamental differences are found in the particle temperature histories and burnout times at low temperature (1250K). The role that fragmentation plays on the char particle history is incorporated into the model and the possible production of fine particulate through fragmentation is examined. A relatively large fraction of the mass of char available for f

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48

Bose, Arun Chand. "Pulverized coal combustion: Fuel nitrogen mechanisms in the rich post-flame." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184635.

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Chemical kinetic mechanisms governing the fate of coal nitrogen in the fuel-rich stage of a pulverized-coal staged combustion process were investigated. Emphasis was on determination of the effects of coal rank, temperature and stoichiometric ratios on the speciation and rates of destruction of nitrogenous species and correlation of coal data by a unif1ed mechanism. The relative importance of homogeneous and heterogeneous mechanisms during post-flame interconversion reactions of the fuel nitrogen pool was quantified. Experiments with doped propane gas and a high- and low-grade coals, burned un

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49

Mill, Christopher John School of Chemical Engineering &amp Industrial Chemistry UNSW. "Pyrolysis of Fine Coal Particles at High Heating Rate and Pressure." Awarded by:University of New South Wales. School of Chemical Engineering and Industrial Chemistry, 2000. http://handle.unsw.edu.au/1959.4/33358.

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High-intensity pyrolysis, rapid heating in an inert gas atmosphere at up to 20 atm pressure, of 6 Australian coals was examined to gain further insight into high-intensity processes such as Integrated Gasification Combined Cycles (IGCC). Experiments focussed on pyrolysis in a specially developed Wire Mesh Reactor (WMR). The particle temperature lagged that of the mesh by 0.2 seconds at a heating rate of 100??~C s -1 and was predicted by modelling. This is part of the reason the volatile yield (VY) results for 10 s hold-time at ???b1.7 wt% daf of coal, is much more reproducible than 1 s hold-ti

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50

Harris, Benjamin James. "The hydrodynamics of circulating fluidized beds." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385331.

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