Bibliografie tematiche / Cryogenic air separation

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Letteratura scientifica selezionata sul tema "Cryogenic air separation"

Autore: Grafiati

Pubblicato: 27 settembre 2024

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Articoli di riviste sul tema "Cryogenic air separation"

Cornelissen, R. L., e G. G. Hirs. "Exergy analysis of cryogenic air separation". Energy Conversion and Management 39, n. 16-18 (novembre 1998): 1821–26. http://dx.doi.org/10.1016/s0196-8904(98)00062-4.

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Cheung, Harry. "Moderate-pressure cryogenic air separation process". Gas Separation & Purification 5, n. 1 (marzo 1991): 25–28. http://dx.doi.org/10.1016/0950-4214(91)80045-7.

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Ionita, Claudia, Elena-Eugenia Vasilescu, Camelia Stanciu, Horatiu Pop e Lucretia Popa. "Optimization of the air separation process in single stage cryogenic units". Technium: Romanian Journal of Applied Sciences and Technology 14 (9 ottobre 2023): 14–17. http://dx.doi.org/10.47577/technium.v14i.9666.

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The industrial use of cryogenic air separation units started more than 130 years ago. Cryogenic air separation units produce oxygen, pure nitrogen and argon in liquid and/or gaseous state. Different configurations of these cryogenic plants lead to different quantities of gas and liquid products. In addition, product purity is also affected by the proposed scheme. As a result, the paper analyzes different variants of installations for the separation of binary gas mixtures based on the Linde process. By comparing energy indices and constructive considerations, the separation plant with external air pre-cooling and the use of a single-stage separation column is chosen. Finally, a study is carried out on the processes in the separation column and a calculation of the minimum mechanical work of separation. The real air consumption curve will also be built, with the help of which we shall determine what quantities of O2 and N2 are obtained by air separation at a specific consumption.

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Xiong, Yong Qiang, e Ben Hua. "Simulation and Analysis of Cryogenic Air Separation Process with LNG Cold Energy Utilization". Advanced Materials Research 881-883 (gennaio 2014): 653–58. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.653.

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In this paper, a cryogenic air separation process with LNG cold energy utilization is proposed to produce liquid nitrogen and high pressure pure oxygen gas economically. To reduce the electric energy consumption of air separation products, liquid nitrogen have been produced by condensing the separated pure nitrogen gas with LNG cold energy utilization, and the recycled nitrogen is served to transfer cold energy from LNG stream to cool off air stream in the proposed cryogenic air separation process. The specifications of streams and the major equipments of the air separation process are simulated with Aspen Plus software and the main parameters analysis are performed. The results show that the energy consumption of the proposed air separation process with LNG cold energy utilization decreased about 58.2% compared with a conventional cryogenic air separation process. The compressed pressure of recycled nitrogen has a big impact on the cost of air separation products and utilization efficiency of LNG cold energy. The LNG cold energy could be fully utilized when the recycled nitrogen has been compressed to above 6.5MPa.

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Parulekar, Prasad J. "Chemical Plant Utility – Nitrogen System Design". International Journal for Research in Applied Science and Engineering Technology 9, n. 11 (30 novembre 2021): 1560–67. http://dx.doi.org/10.22214/ijraset.2021.39047.

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Abstract: The study is been conducted to understand the different techniques to separate nitrogen from atmospheric air. Separation of nitrogen takes place by following techniques: Cryogenic air separation, Pressure swing adsorption and Membrane separation technique. Cryogenic air separation operates at a very low temperature, which uses the principle of rectification to separate nitrogen at a very high purity (99.999%). Pressure swing adsorption rely on the fact that higher the pressure, more the gas is adsorbed which results in high purity (95-99.99%) of nitrogen. Membrane separation technology is the process that uses hollow fibre membranes to separate the constituent gases in air, which gives the purity in the range of 93%-99.5%. After the comparative study, it is understood that membrane separation technique is the most efficient technology based on the cost, purity, flexibility in terms of adjusting the purity, maintenance, availability; it operates without heating and therefore uses less energy than conventional thermal separation processes. Different step designs of membrane separation techniques are discussed. A Process Flow Diagram and Piping Instrumentation Diagram is been added for single step membrane separation technique. Keywords: Atmospheric air, nitrogen, Cryogenic air separation, Pressure swing adsorption, Membrane separation technique.

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Dutta, T., K. P. Sinhamahapatra e S. S. Bandyopadhyay. "CFD Analysis of Energy Separation in Ranque-Hilsch Vortex Tube at Cryogenic Temperature". Journal of Fluids 2013 (14 novembre 2013): 1–14. http://dx.doi.org/10.1155/2013/562027.

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Study of the energy separation phenomenon in vortex tube (VT) at cryogenic temperature (temperature range below 123 K) has become important because of the potential application of VT as in-flight air separator in air breathing propulsion. In the present study, a CFD model is used to simulate the energy separation phenomenon in VT with gaseous air at cryogenic temperature as working fluid. Energy separation at cryogenic temperature is found to be considerably less than that obtained at normal atmospheric temperature due to lower values of inlet enthalpy and velocity. Transfer of tangential shear work from inner to outer fluid layers is found to be the cause of energy separation. A parametric sensitivity analysis is carried out in order to optimize the energy separation at cryogenic temperature. Also, rates of energy transfer in the form of sensible heat and shear work in radial and axial directions are calculated to investigate the possible explanation of the variation of the hot and cold outlet temperatures with respect to various geometric and physical input parameters.

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Khalel, Zeinab A. M., Ali A. Rabah e Taj Alasfia M. Barakat. "A New Cryogenic Air Separation Process with Flash Separator". ISRN Thermodynamics 2013 (27 giugno 2013): 1–4. http://dx.doi.org/10.1155/2013/253437.

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A new cryogenic air separation process with flash separator is developed. A flash separator is added to the conventional double-column cryogenic air separation process. The flash separator is used to replace the turbine required to recover a portion of the energy in the double-column air separation process. The flash separator served dual purposes of throttling and separation. Both the conventional and the new processes are simulated using Aspen Plus version 11.1 the model air flow rate and compositions are taken as 50000 Nm3/h of air at standard conditions of 1 atm and 25°C and feed composition of 79.1% N2 and 20.9% O2. The new process decreases the energy consumption and increases the productivity.

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Miller, Jason, William L. Luyben, Paul Belanger, Stephane Blouin e Larry Megan. "Improving Agility of Cryogenic Air Separation Plants". Industrial & Engineering Chemistry Research 47, n. 2 (gennaio 2008): 394–404. http://dx.doi.org/10.1021/ie070975t.

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Hamayun, Muhammad Haris, Naveed Ramzan, Murid Hussain e Muhammad Faheem. "Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis". Energies 13, n. 23 (2 dicembre 2020): 6361. http://dx.doi.org/10.3390/en13236361.

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Cryogenic air separation processes are widely used for the large-scale production of nitrogen and oxygen. The most widely used design for this process involves two distillation columns operating at different pressures. This work focuses on the selection of suitable cryogenic air separation process by evaluating seven alternative designs of the two-column air separation process based on detailed exergy analysis. The feed conditions (500 tons/h, and 50% relative humidity of air), product purities (99 mole% for both nitrogen and oxygen), and operational conditions (pressures of both distillation columns) are kept same in all designs. The two cryogenic distillation columns in each configuration are heat-integrated to eliminate the need for external utilities. Steady-state simulation results are used to calculate the exergy efficiency (%) of each equipment as well as its contribution toward the overall exergy destruction rate (kW) of the process. The results show that the compression section is a major source of exergy destruction, followed by the low-pressure column, and the multi-stream heat exchanger. A Petlyuk-like configuration, labeled as C1, provides the lowest exergy destruction rate.

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Bucsa, Sorin, Alexandru Serban, Mugur C. Balan, Claudia Ionita, Gabriel Nastase, Catalina Dobre e Alexandru Dobrovicescu. "Exergetic Analysis of a Cryogenic Air Separation Unit". Entropy 24, n. 2 (13 febbraio 2022): 272. http://dx.doi.org/10.3390/e24020272.

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This case study analyzes a cryogenic air separation unit (ASU) with a production of V˙O2=58,300 [m3Nh] of gaseous oxygen with a concentration greater than 98.5%, operating in Romania on a steel plant platform. The goal of the paper is to provide an extensive model of exergetic analysis that could be used in an optimization procedure when decisional parameters are changed or structural design modifications are implemented. For each key part of the Air Separation Unit, an exergetic product and fuel were defined and, based on their definition, the coefficient of performance of each functional zone was calculated. The information about the magnitude of the exergetic losses offers solutions for their future recovery. The analysis of the exergy destructions suggests when it is worth making a larger investment. The exergetic analysis of the compression area of the ASU points out an exergy destruction and loss of 37% from the total plant’s electrical energy input. The exergy loss with the heat transferred to the cooling system of compressors can be recovered; for the exergy destruction portion, the challenge between investment and operating costs should be considered. The exergy destruction of the air separation columns found the High Pressure Column (HPC) to be more destructive than the Low Pressure Column. The share of the exergy destruction in the total plant’s electrical energy input is 8.3% for the HPC. The local COP of the HPC, calculated depending on the total exergy of the local product and fuel, is 62.66%. The calculus of the air separation column is performed with the ChemSep simulator.

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Più fonti

Tesi sul tema "Cryogenic air separation"

van, der Ham Leen. "Improving the Second law efficiency of a cryogenic air separation unit". Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14772.

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One-quarter of the worldwide greenhouse gas emissions is emitted by fossil fuel based power plants. In order to limit future climate changes caused by these emissions, several types of CO2-capturing power plants are currently being developed. An integrated gasification combined cycle (IGCC) is one of the most promising alternatives. It is the mission of a European collaboration project called DECARBit to enable the commercial use of this type of power plant. One of themain process units of an IGCC is the air separation unit (ASU). It provides both oxygen and nitrogen to the gasifier, and nitrogen to the gas turbine. The main objective of this thesis is to improve the Second law efficiency of a cryogenic ASU, with a focus on the use of novel distillation concepts. Improving the Second law efficiency of a process is equivalent to improving its exergy efficiency. In this thesis, the exergy efficiency is defined as the desired change in exergy contents of the ASU products divided by the net amount of added work. Using exergy analysis, it is shown that the exergy efficiency of a state-of-the-art two-column ASU with a pumped liquid cycle is approximately 35%. Most of the exergy destruction is located in the compressor after-coolers, the distillation section, and the main heat exchanger. The irreversibilities in the compressor after-coolers are caused by the use of cooling water. They can almost completely be eliminated by transferring the heat of compression to the ASU products instead of to the cooling water. The achieved reduction in exergy destruction corresponds to almost 1% of the net electric efficiency of the IGCC and it increases the exergy efficiency of the ASU to approximately 70%. Two alternatives are presented that can improve the distillation section efficiency. The first one is the addition of a third distillation column; it can reduce the exergy destruction in the distillation section by approximately 30%. The second option is to improve the heat integration of the two distillation columns, by using heat-integrated distillation stages (HI stages). These HI stages are the basis of a relatively novel distillation column configuration called a heat-integrated distillation column (HIDiC). In an ASU, the use of HI stages enables a lower operating pressure in the high-pressure column, which reduces the required work input to ASU. Depending on the amount of heat-transfer capacity per HI stage, the exergy destruction in the distillation section can be reduced by 20 to 30% due to the use of HI stages. HI stages and HIDiCs are not yet in industrial use. So far, only two complete HIDiCs have been built, both using concentrically-integrated columns equipped with structured packing. They have proven the feasibility of the HIDiC concept, but detailed knowledge on the performance of the columns is still very scarce. As a result, simulations of packed concentric HIDiCs still involve several uncertainties. They are related to the achievable overall heat-transfer coefficient, to the performance of a ring-shaped distillation column, and to the effects that a radial heat flux has on the column performance. In order to obtain more insight into these phenomena, two research directions have been pursued: a theoretical one and an experimental one. The theoretical work concerns the further development of a model for the simultaneous transfer of mass and thermal energy, based on the theory of irreversible thermodynamics. The model describes the vapour–liquid interface region of a mixture as a series of connected control volumes that together represent a vapour film, the interface, and a liquid film. This interface region is located in between the bulk vapour and bulk liquid phases; the conditions at its boundaries are equal to the adjacent bulk phase conditions. A routine has been developed that calculates the thermal and molar fluxes through the interface region, based on input values for the boundary conditions, or driving forces. The film thicknesses ratio is found by requiring consistency between the entropy productions calculated using the entropy balance and using the product-sum of conjugate fluxes and driving forces. By applying this model to a nitrogen–oxygen mixture, it has been shown that the direct coupling between heat and diffusion fluxes has a considerable influence on the calculated values of the fluxes. The measurable heat flux is most sensitive to the coupling effect, which makes a correct description of the effect especially important when simulating a HIDiC. Another important model parameter is the number of control volumes that is used to represent the films. The effect of the interface resistances on the calculation results was relatively small. The experimental work concerns the development of a new experimental HIDiC. The designed set-up consists of a cylindrical inner column with a diameter of 14 cm that is surrounded by a ring-shaped outer column with a diameter of 22 cm. A difference in operating pressures causes thermal energy to be transferred from the high-pressure inner column to the low-pressure outer column. Both columns will be equipped with 1.6 m of structured packing and will operate at total reflux conditions. The set-up is designed to operate at cryogenic temperatures, elevated pressures, and high oxygen concentrations. At the top of the set-up, two copper-brazed plate heat exchangers will be used as condensers, using evaporating nitrogen as coolant. Electrical heaters with a maximum duty of 25 kW will be used as reboilers. Radial and angular temperature and composition gradients inside the columns will be measured directly at several height levels, in both the vapour and liquid phases. These measurements can also be used to determine the separation efficiency of the columns. The total amount of thermal energy transfer will be obtained based on two independent measurements of the condenser and reboiler duties of both columns. The set-up can also be used to assess the coupling between thermal and molar fluxes.

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Kruger, Theunis Johannes. "A generic framework for continuous energy management at cryogenic air separation plants". Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-05272005-165835/.

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Bian, Shoujun. "Nonlinear modeling, estimation and predictive control of cryogenic air separation columns". 2006. https://scholarworks.umass.edu/dissertations/AAI3242307.

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Cryogenic air separation columns produce high-purity air components for various industries. The need to operate these very high-purity columns over a wide range of production rates in response to time-varying electrical costs motivates the development of nonlinear control strategies. First-principles models of distillation columns are too complicated to be used on-line for optimization-based nonlinear control. The goal of this dissertation is to develop reduced-order nonlinear models for cryogenic air separation columns and to use these models to develop nonlinear model predictive controllers that allow operation over a wide range of production rates. An approach for selecting stage composition/temperature measurements for on-line estimation of wave model parameters is presented. The focus is on high-purity distillation columns, which are particularly challenging due to the presence of highly pinched composition profiles. The proposed method provides a compromise between two competing effects, the sensitivity of stage composition predictions to model parameters and collinearities between these sensitivities. An iterative calculation procedure based on a scaled sensitivity matrix yields a ranking of the stage compositions according to their usefulness for parameter estimation. The proposed method offers several important advantages over existing techniques including the capability to rank more measurements than the number of estimated variables and to allow the inclusion of existing plant measurements. Two high-purity column simulators are used to illustrate the measurement selection procedure and the subsequent design of nonlinear state/parameter estimators using the extended Kalman filtering approach. The simulation results suggest that the proposed method is more powerful than conventional measurement selection techniques based on singular value decomposition. A simplified nonlinear wave model is used to design a nonlinear model predictive controller for a simulated nitrogen purification column. A first-principles model constructed in Aspen Dynamics (Aspen Technology) is used as a surrogate plant in the simulation studies. Estimates of the unmeasured wave position and key wave model parameters are generated with an extended Kalman filter using a combination of composition and temperature measurements determined with the measurement selection procedure. The nonlinear model predictive controller manipulates the vapor nitrogen production rate to achieve the target nitrogen purity. The estimator and controller are combined through a state disturbance model that provides feedback and eliminates offset due to modeling errors. The proposed control strategy is compared to a classical control system consisting of a ratio controller and a PID controller. The proposed controller is shown to outperform the classical control system for large measured disturbances in the feed air flow rate. The single-column work is extended by exploring the feasibility of nonlinear model-based control for the double-column process used to produce purified nitrogen and oxygen. A reduced-order dynamic model for the upper column is developed by applying time-scale arguments to a detailed stage-by-stage model that includes mass and energy balances and that accounts for non-ideal vapor-liquid equilibrium. The column is divided into compartments according to the locations of liquid distributors as well as feed and withdrawal streams. The differential equations describing each compartment are placed in singularly perturbed form through the application of a physically based coordinate transformation. Application of singular perturbation theory yields a differential-algebraic equation model with significantly fewer differential variables than the original stage-by-stage model. A rigorous column simulator constructed using Aspen Dynamics (Aspen Technology) is used to assess the tradeoff between reduced-order model complexity and accuracy as the number of compartments is varied. The reduced-order model is shown to provide good agreement with the Aspen simulator over a wide range of operating conditions.

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K, umar Lukesh. "Analysis of steady state Cryogenic Air Separation unit of Rourkela Steel Plant and simulation of Fixed Bed Adsorption Separation of Air". Thesis, 2014. http://ethesis.nitrkl.ac.in/5591/1/212ME5406-9.pdf.

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Atmospheric dry air contains approximately 78% nitrogen, 21% oxygen, and 1% argon plus low concentrations of noble gases like carbon dioxide, hydrocarbons and other impurities. An air separation unit divides atmospheric air into the three pure gaseous components (nitrogen, oxygen and argon). Further separation may be performed on some plants to produce other gases such as krypton, neon and xenon. Other gas components of atmospheric air, such as carbon dioxide, water vapour and hydrocarbons must be removed to ensure safety, product quality and efficient plant operation. Nitrogen, oxygen and argon are used by industry in large quantities and hence termed industrial gases. The current work aim is to simulate the cryogenic air separation unit including adsorber and cryogenic distillation. Simulation of absorber is carried out using ADSIM of Aspen Tech to remove carbon dioxide (CO2) and water vapour (H2O). The breakthrough curves of carbon dioxide (CO2) and water vapour on 5A molecular sieve and activated alumina respectively are found at different Reynolds number. The study helps to find out schedule time adsorber/desorber unit. ASPEN Plus simulator is used to simulate cryogenic air separation into nitrogen, oxygen and argon. The steady-state simulation results (purity) are compared to Rourkela steel plant real data.

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Bhunya, D. K. "Simulation study of cryogenic air separation unit using Aspen Hysys at Rourkela steel plant". Thesis, 2014. http://ethesis.nitrkl.ac.in/5971/1/E-138.pdf.

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It’s been a few days now, requirement of Nitrogen, Oxygen and Argon increases day by day. Especially for a steel industry this three components are very essential for their steel production like decarburization, desulphurization, hydrogen removal, nitrogenation, argon, oxygen removal, metal cutting, welding, and cooling etc. Cryogenic air separation has the best impact to separate the air. Study and analyses of practical plant performance through computer aided programs has better and cost effective. Aspen Hysys by Aspen Technology is one of the major process simulators that are widely used in cryogenic, chemical and thermodynamic process industries today. In this work, the simulation study of cryogenic air separation unit (Rourkela steel plant, Odisha) is performed by using Aspen Hysys. The simulation study is based on both steady state and dynamic (high pressure column and low pressure column). The dynamic air separation unit has been designed based on PI controller. The plant efficiency, specific power consumption, product purity and behaviour of process parameter with respect to time and feed disturbance have been discussed.

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Miller, Jason J. "Rapid startup of cryogenic air separation plants by collection and distribution of process liquid". 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3316891.

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Aadhithiyan, A. K. "Studies on Hard Chrome Plating on Cylinder Liner of Air Compressor and Numerical Analysis of Cascade Cooler for an Air Separation Unit". Thesis, 2018. http://ethesis.nitrkl.ac.in/9663/1/2018_MT_216ME5394_AKAadhithiyan_Studies.pdf.

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This present work is to investigate the effects of chrome plating in reciprocating air compressors that result in reduction of power consumption. Reciprocating air compressors are the most commonly used compressors for domestic and industrial purposes to give required air output in terms of free air delivery, delivery temperature and maximum working pressure. The objective of this study is to develop a better understanding on the effects of chrome plating in the cylinder to build a lesser power consumed compressor with greater air output. Cylinders are made of graded cast iron that is then honed and hard chrome plated. The adequacy of this model can be verified using thermal image analysis, which includes the various temperature distribution plots around the compressor components. Further delivery temperature, actual displacement and free air delivery pressure are the parameters that conclude the deviation in actual and experimental values. This paper suggests the need of hard chrome plating to the compressor cylinder that resulted in annual power savings of about 25%. The increase in volumetric efficiency was about 20 -30% from the actual conditions. A cascade system for reducing the temperature of compressed air for processing the feed air in a cryogenic air separation plant whereindry nitrogen vapor from the bottom column of the plant is made to bubble with water. The feed air for the air compressor is cooled to about 310 –330 K which is highly recommended and efficient when the feed air enters the Air purification unit. The cascade cooling system eliminates the need of Freon cooler that results in economy. The numerical simulation have been conducted on single tube copper channel and copper coil bundles with two phase and multi-phase flow and temperature contours are displayed that indicates the compressed feed air temperature reduced to 380K in single copper tube channel and 313 K in copper coil bundle case which was the most effective respectively

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Libri sul tema "Cryogenic air separation"

J, Nowobilski J., e Lewis Research Center, a cura di. Airborne rotary air separator study: Final report. Tonawanda, NY: Praxair, Inc., 1992.

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Airborne rotary air separator study: Final report. Tonawanda, NY: Praxair, Inc., 1992.

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Capitoli di libri sul tema "Cryogenic air separation"

Wilcox, Jennifer. "Cryogenic Distillation and Air Separation". In Carbon Capture, 219–29. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2215-0_6.

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Grenier, M., e P. Petit. "Cryogenic Air Separation: The Last Twenty Years". In Advances in Cryogenic Engineering, 1063–70. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2213-9_119.

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DiNapoli, R. N., e A. M. Sass. "High-Purity Products from an Air Separation Plant". In Advances in Cryogenic Engineering, 399–405. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-0513-3_49.

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Aldridge, C. J., e A. C. Fowler. "Mathematical Modelling of Thermosyphons in Cryogenic Air Separation Plants". In European Consortium for Mathematics in Industry, 75–78. Wiesbaden: Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-663-09834-8_9.

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Zhang, Qi, Ignacio E. Grossmann e Jose M. Pinto. "Optimal Demand Side Management for Cryogenic Air Separation Plants". In Advances in Energy Systems Engineering, 535–64. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42803-1_18.

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Manikowski, A., G. Noland e M. A. Green. "The Elimination of Oxides of Nitrogen from the Exhaust of a Diesel Engine Using Cryogenic Air Separation". In Advances in Cryogenic Engineering, 1237–43. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-9047-4_154.

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Venetucci, J. M. "Air-Separation Plant System to Produce Cryogens". In Cryogenic Recycling and Processing, 57–67. CRC Press, 2018. http://dx.doi.org/10.1201/9781351071253-4.

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Wilson, K. B., D. W. Woodward e D. C. Erickson. "NEW, LOW-ENERGY PROCESSES FOR CRYOGENIC AIR SEPARATION". In Proceedings of the Twelfth International Cryogenic Engineering Conference Southampton, UK, 12–15 July 1988, 355–59. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-408-01259-1.50070-x.

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Fu, Chao, e Truls Gundersen. "Using PSE to develop innovative cryogenic air separation processes". In Computer Aided Chemical Engineering, 1602–6. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-444-59506-5.50151-6.

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Zhang, Qi, Clara F. Heuberger, Ignacio E. Grossmann, Arul Sundaramoorthy e Jose M. Pinto. "Optimal Scheduling of Air Separation with Cryogenic Energy Storage". In 12th International Symposium on Process Systems Engineering and 25th European Symposium on Computer Aided Process Engineering, 2267–72. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-444-63576-1.50072-8.

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Atti di convegni sul tema "Cryogenic air separation"

Yu Zhu, Xinggao Liu e Zhiyong Zhou. "Optimization of Cryogenic Air Separation Distillation Columns". In 2006 6th World Congress on Intelligent Control and Automation. IEEE, 2006. http://dx.doi.org/10.1109/wcica.2006.1713466.

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Nakano, A. "Investigation for Magnetic Separation of Oxygen from Supercritical Air Near the Maxcondentherm Point". In ADVANCES IN CRYOGENIC ENGEINEERING: Transactions of the Cryogenic Engineering Conference - CEC. AIP, 2004. http://dx.doi.org/10.1063/1.1774896.

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Panapitiya, Vishwa, Randika Randeniya, Nipuna Thennakoon, Mahinsasa Narayana e Adus Amarasinghe. "Multi-Objective Optimization Methodology for Cryogenic Air Separation Process". In 2022 Moratuwa Engineering Research Conference (MERCon). IEEE, 2022. http://dx.doi.org/10.1109/mercon55799.2022.9906238.

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Smith, A. R., e J. L. Dillon. "Gas Turbine Applications for Large Air Separation Units". In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-321.

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Oxygen production rates of 10,000 to 20,000 tons per day from large, cryogenic air separation units are being studied by many alternative fuel project developers. These projects utilize oxygen to partially oxidize hydrocarbon materials, producing a clean synthesis gas that can be used as a fuel or for conversion into valuable chemical products. Specific market applications include natural gas or waste material conversion processes and multi-train integrated gasification combined cycle facilities. In an effort to reduce specific facility cost project developers increase facility output to obtain economies of scale, resulting in large oxygen requirements for the partial oxidation step. One of the challenges to provide cost effective oxygen is the economic supply of large quantities of compressed air for use in the cryogenic air separation process. To date, gas turbines have found limited application for use in air separation facilities due to their relatively high capital cost compared to traditional electric motor drives. The need for large, single train air separation units to support alternative fuel projects creates opportunities for the use of gas turbines. This paper explores the use of commercially available equipment, configured to integrate with air separation processes, to improve the economics of oxygen production. Long term developmental equipment configurations are presented to further improve the economics of these facilities.

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Wang, Baoqun, Hongguang Jin, Wei Han e Danxing Zheng. "IGCC System With Integration of CO2 Recovery and the Cryogenic Energy in Air Separation Unit". In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53723.

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In this paper, we proposed a new type of IGCC system with CO2 recovery, which employed the cryogenic energy of the air separation unit. The idea of integration of CO2 separation is introduced and the theoretical separation work was compared between the integration CO2 separation process and the traditional CO2 separation process. Different from the two-step (separation and compression) CO2 recovery processes commonly used, the new system can separate and liquefy CO2 simultaneously by means of integration of the cryogenic energy of air separation unit and CO2 recovery unit. In this way, a large amount of compression work can be reduced, compared with wet scrubbing processes to sequestrate the recovered CO2. The new integration system was compared with the amine absorption process. The result indicated that through energy integration between air separation and CO2 recovery, the energy consumption of CO2 separation is expected to be reduced by 28.4%, compared to the traditional amine absorption process. Based on the investigation, the paper make a contribution to provide a concept of integration of cold energy with CO2 separation for the purpose of increase in efficiency and mitigation of greenhouse gas impact.

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Piotrowska-Hajnus, Agnieszka, e Maciej Chorowski. "Performance analysis of small capacity liquid nitrogen generator based on Joule-Thomson refrigerator coupled with air separation membrane". In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC, Volume 57. AIP, 2012. http://dx.doi.org/10.1063/1.4706981.

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Elzouka, Mahmoud, Mohammed Elgohary e Abdelhamid Attia. "Control of Heat Integrated Distillation Employed by Cryogenic Air Separation Using Decentralized Simple PID Controllers". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51223.

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Coupling cryogenic air separation plant to industrial processes imposes demand change on the air separation process. Therefore, control of cryogenic air separation plant is a must for stable operation. In this research, we introduce a control scheme for heat integrated distillation which is the main process of cryogenic air separation. The control is achieved via decentralized PID controllers, and its performance is investigated using numerical simulation. Sizing of distillation columns, control valves and heat exchanger were undertaken to simulate industrial air separation plant. In order to verify control system performance, five different control scenarios were studied, including switching between full load to part load, and switching between full production of oxygen to full production of nitrogen, which has not been reported in literature. The simulation results show satisfactory performance of control system facing the disturbing scenarios. However, in severe transition cases (i.e. transition from full liquid nitrogen to full liquid oxygen production), liquid level in the low pressure column base increased excessively and approached safe operating limits. This side effect requires care in controllers tuning, or even introducing level interlocks.

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Lige Tong, Li Wang, Shufeng Sun e Yanping Zhang. "Research and Development of Operation Simulation System for Cryogenic Air Separation Unit". In 2010 Second World Congress on Software Engineering (WCSE 2010). IEEE, 2010. http://dx.doi.org/10.1109/wcse.2010.122.

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Sethi, Prabhakar, Anit Tiwari, DSS Kiran Kumar, K. Balasubramanian e M. Mandal. "Optimization of power consumption opportunity in cryogenic Air Separation plant at RINL". In 2020 International Conference on Renewable Energy Integration into Smart Grids: A Multidisciplinary Approach to Technology Modelling and Simulation (ICREISG). IEEE, 2020. http://dx.doi.org/10.1109/icreisg49226.2020.9174196.

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Zhao, Wei, Jinju Sun, Hezhao Zhu, Cheng Li, Guocheng Cai e Guohong Ma. "Numerical Investigation of a Cryogenic Liquid Turbine Performance and Flow Behavior". In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50391.

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A single stage cryogenic liquid turbine is designed for a large-scale internal compression air-separation unit to replace the Joule-Thompson valve and recover energy from the liquefied air during throttling process. It includes a radial vaned nozzle, and 3-dimensional impeller. Numerical investigation using 3-D incompressible Navier-Stokes Equation together with Spalart-Allmaras turbulence model and mixing plane approach at the impeller and stator interface are carried out at design and off-design flow. At design condition, recovered shaft power has amounted to 185.87 kW, and pressure in each component decreases smoothly and reaches to the expected scale at outlet. At small flow rates, flow separation is observed near the middle section of blade suction surface, which may cause local vaporization and even cavitation. To further improve the turbine flow behavior and performance, geometry parametric study is carried out. Influence of radial gap between impeller and nozzle blade rows, and nozzle stagger angle on turbine performance are investigated and clarified. Results arising from the present study provide some guidance for cryogenic liquid turbine optimal design.

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