Comparative analysis on temperature swing adsorption cycle for carbon capture by using internal heat/mass recovery
Comparative analysis on temperature swing adsorption cycle for carbon capture by using internal heat/mass recovery
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DOI：
10.1016/j.applthermaleng.2020.114973
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发表时间：
2020-02
影响因子：
6.4
通讯作者：
L. Jiang;Ruiqi Wang;A. González-Díaz;A. Smallbone;Rasaq. O. Lamidi;A. Roskilly
中科院分区：
文献类型：
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作者：
L. Jiang;Ruiqi Wang;A. González-Díaz;A. Smallbone;Rasaq. O. Lamidi;A. Roskilly
由于吸收技术能耗较高，吸附式二氧化碳捕集近年来发展势头强劲。本文旨在通过整合内部质量回收和热回收，进一步提高四步变温吸附循环的热性能。利用活性炭的吸附特性对其火用效率进行了评价，并对基本循环、热回收循环、质量回收循环、热质量回收循环四种不同的情况进行了比较，说明了不同回收技术的优缺点。结果表明，热回收和质量回收技术有利于提高循环热效率的上限。在不同的脱附/吸附温度和压力条件下，采用回收技术的火用效率与基本循环相比可提高2.86倍。在实际应用中，吸附反应器未利用率和金属比对循环性能影响较大，而质量回收率影响较小。所提出的回收技术的一个潜在应用是在建筑通风系统中直接捕获空气，因为在低二氧化碳浓度下可以实现最大的改善。
Due to relatively high energy consumption of absorption technology, adsorption carbon dioxide capture is gathering the momentum in recent years. This paper aims to further improve the thermal performance of a 4-step temperature swing adsorption cycle by integrating internal mass recovery and heat recovery. Exergy efficiency is evaluated by using adsorption characteristics of activated carbon and compared in terms of four different situations i.e. basic cycle, heat recovery cycle, mass recovery cycle, heat and mass recovery cycle, which could illustrate the advantages and disadvantages of different recovery technologies. Results demonstrate that heat recovery and mass recovery technologies are quite conducive to improve the up limit of cycle thermal efficiency. Under the conditions of different desorption/adsorption temperatures and pressures, exergy efficiencies using recovery technologies could be improved by up to 2.86 times when compared with that of basic cycle. Besides, in real application unused percentage of adsorption reactor and metal ratio have large influence on the cycle performance while mass recovery rate has a relatively small influence. One potential application of the proposed recovery technologies is direct air capture in building ventilation system since a largest improvement could be achieved at a low carbon dioxide concentration.