TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION

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TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION ( temperature-swing-adsorption-processes-for-gas-separation )

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process performance is determined through simulations, the pilot plant could be built based on the specified geometry, boundary conditions and energy requirements. Based on the total working and coupling fluid flow rates, headers and valves can be designed and installed. A vertically upward flow direction through the microchannels is recommended, which not only reduces system footprint, but also minimizes flow maldistribution. Flow distribution in headers of the microchannel monolith in these plants is an important topic of further investigation, as flow maldistribution can be a considerable challenge for the scaling up of the pilot plant. Additionally, the effect of mixing of hot and cold HTFs in the inlet headers should be analyzed so that efficient headers to minimize loss of hot HTF energy during desorption can be designed. Another concern identified in the present work is the adsorbent layer manufacturing variability. It was observed that when a coating and solution drying approach was used for making the channels, the layer was discontinuous and non- uniform, giving rise to variable temperature rise during adsorption. Additionally, only gases were passed through the microchannels in the present work. Very high adsorbent mass fraction in the adsorbent layer, as was the case for the customized coated microchannels used in the present work, results in a high gas separation capacity; however, durability of such microchannels for use in continuous gas separation operations on a large scale is not fully established. In presence of fast-moving liquid, the resulting shear may pose challenges to the adherence of such a layer to the covering support. Adsorbent could be held in a fixed annular medium, such as a polymer matrix employed by Lively et al. (2009), to ensure that adsorbent volume fractions and adsorbent layer thickness are uniform throughout along the microchannel length. 164

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TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION

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