دانلود رایگان مقاله لاتین فرآیند جذب کربن از سایت الزویر
عنوان فارسی مقاله:
توسعه یک نظریه تعادل حل کننده برای چرخه جذب نوسان فشار مورد استفاده در فرآیندهای جذب کربن اعمال شده
عنوان انگلیسی مقاله:
Development of an equilibrium theory solver applied to pressure swing adsorption cycles used in carbon capture processes
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Pressure Swing Adsorption (PSA) cycles are widely used as gas separation unit operations; examples of industrial applications include hydrogen purification and air separation for the production of both nitrogen and oxygen (Ruthven, 1984; Ruthven et al., 1994). In the case of hydrogen purification and oxygen production the separation is based on equilibrium selectivity. The more strongly adsorbed components are held by the solid and a high purity product is obtained. Production of nitrogen is achieved via a kinetic selectivity because oxygen has a slightly smaller critical diameter and diffuses more rapidly in solids that have critically sized micropores (Ruthven et al., 1994). Clearly in this case the separation is operated far from equilibrium conditions, which would either favour nitrogen due to the larger quadrupole moment or would yield a small equilibrium selectivity if van der Waals forces prevail (Ruthven, 1984). CO2 post-combustion capture from coal fired power plants using PSA can be achieved using adsorbents that show high equilibrium selectivity (see for example Kikkinides et al., 1993; Krishnamurthy et al., 2014; Webley, 2014), but in this case more complex process configurations are needed because carbon dioxide is the more strongly adsorbed component (see for example Ebner and Ritter, 2002; Luberti et al., 2013; Wang et al., 2013). For these systems, the materials are designed to reduce mass transfer resistances, which are primarily in the macropores (Hu et al., 2014). The design and optimisation of PSA processes are complex because the system is intrinsically dynamic, depends on a large number of parameters and the simulations have to be carried out until the adsorption columns reach cyclic steady state (CSS) (Cheng et al., 1998; Friedrich et al., 2013 and Simo et al., 2008). For equilibrium driven separations any mass transfer resistance or other terms that lead to dispersion of the separation front will reduce the efficiency of the separation. For this reason, simulations which neglect any effects that lead to dispersion of the separation front can establish optimal bounds on the performance of equilibrium drivenseparations (Ruthven, 1984;Ruthvenet al., 1994). To achieve this, these simulations assume instantaneous mass and heat transfer between the gas and solid phase and negligible axial dispersion. Thus equilibrium theory assumes that the adsorbed phase is in equilibrium with the gas phase: the adsorbed phase concentration is calculated directly from the adsorption isotherm and the gas phase concentration. This simplification reduces the number of differential equations since only the mass and the energy balances in the gas phase have to be solved without mass and heat transfer resistances and axial dispersion terms (Ruthven, 1984). Thus equilibrium theory simulations can establish the range of optimal conditions of the full process from a limited number of experimental equilibrium measurements or molecular simulations (see for example Banu et al., 2013).
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کلمات کلیدی:
Integrated adsorbent-process optimization for carbon capture and ... onlinelibrary.wiley.com/doi/10.1002/aic.15602/full by M Khurana - 2016 - Related articles Jan 26, 2017 - The traditional pressure or vacuum swing adsorption (PSA) ... Two VSA cycles, namely a four-step process1, currently known to have ... to their optimum performance in a carbon capture process by VSA. ..... The process simulation model used in the current work has been developed in our previous study. New Pressure Swing Adsorption Cycles for Carbon ... - ResearchGate https://www.researchgate.net/.../226449136_New_Pressure_Swing_Adsorption_Cycles_f... A rigorous pressure swing adsorption (PSA) process simulator was used to study a ... and show the potential of a high temperature PSA cycle for CO2 capture. PRESSURE SWING ADSORPTION FOR CARBON DIOXIDE ... https://www.researchgate.net/.../238681749_PRESSURE_SWING_ADSORPTION_F... We used a four-step cycle comprising pressurization, feed, counter-current ... Keywords: Carbon Dioxide, Sequestration and Pressure Swing Adsorption. ... production processes are implemented, the capture of carbon dioxide and its storage ... New Pressure Swing Adsorption Cycles for Carbon ... - Springer Link link.springer.com/article/10.1007/s10450-005-5980-x by SP Reynolds - 2005 - Cited by 92 - Related articles A rigorous pressure swing adsorption (PSA) process simulator was used to study a ... and show the potential of a high temperature PSA cycle for CO2 capture. Design and simulation of pressure swing adsorption cycles for CO2 ... https://www.era.lib.ed.ac.uk/handle/1842/16198 by GD Oreggioni - 2015 - Related articles Nov 26, 2015 - Carbon capture and storage technologies (CCS) are expected to play a key role in the future energy matrix. Different gas separation processes ... Oreggioni2015.pdf - Edinburgh Research Archive - University of ... https://www.era.lib.ed.ac.uk/bitstream/handle/1842/16198/Oreggioni2015.pdf?...3 by GD Oreggioni - 2015 - Related articles Design and simulation of pressure swing adsorption cycles for CO2 capture ..... carbon capture and storage (CCS) processes and the use of renewable sources.
