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Performance exploration of temperature swing adsorption technology for carbon dioxide capture

机译：变温吸附技术捕集二氧化碳的性能探索

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Adsorption technology is recognised to be a promising CO2 capture method due to its desirable characteristics e.g. reusable nature of adsorbents, low capital investment and easy automatic operation. To further improve thermal performance, internal heat recovery is adopted for adsorption CO2 capture through analogy with adsorption refrigeration. Based on carbon pump theory, thermal performance of 4-step temperature swing adsorption (TSA) processes is analysed at various adsorption/desorption temperatures and pressures. Exergy efficiency of adsorption CO2 capture with and without heat recovery will be evaluated and compared by using experimental adsorption characteristics of activated carbon. Metal part and unused percentage of adsorption reactor are defined to further assess their influence on system performance in real application. Results indicate that sensible heat of adsorbents and adsorbed phase account for the major part of heat consumption. For different desorption/adsorption temperatures and pressures, theoretical exergy efficiency of 4-step TSA cycle ranges from 0.022 to 0.221. Heat recovery is conducive to exergy efficiency. Through heat recovery, exergy efficiency could be improved from 54.3% to 84.6% when mass ratio increases from 0 to 8. Similarly, the improvement by using heat recovery is up to 90% in terms of different unused percentages.
机译：吸附技术由于其所希望的特性，例如吸附特性，被认为是一种有前途的二氧化碳捕获方法。吸附剂可重复使用，投资少，易于自动操作。为了进一步提高热性能，采用内部热回收的方式类似于吸附制冷来吸附CO2。基于碳泵理论，分析了四步变温吸附（TSA）工艺在各种吸附/解吸温度和压力下的热性能。通过使用活性炭的实验吸附特性，可以评估和比较在有无热回收的情况下捕获CO2的火用效率。定义了金属部分和吸附反应器的未使用百分比，以进一步评估它们在实际应用中对系统性能的影响。结果表明，吸附剂和吸附相的显热占热量消耗的主要部分。对于不同的解吸/吸附温度和压力，4步TSA循环的理论火用效率为0.022至0.221。热回收有利于提高火用效率。通过热回收，当质量比从0增加到8时，火用效率可以从54.3％提高到84.6％。类似地，对于不同的未使用百分比，通过使用热回收的改进最多可以达到90％。

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