Carbon Dioxide Recovery from a Simulated Dry Exhaust Gas by an Internally Heated and Cooled Temperature Swing Adsorption Packed with a Typical Hydrophobic Adsorbent
Carbon Dioxide Recovery from a Simulated Dry Exhaust Gas by an Internally Heated and Cooled Temperature Swing Adsorption Packed with a Typical Hydrophobic Adsorbent
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DOI：
10.1016/j.seppur.2021.120249
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发表时间：
2021-12
影响因子：
8.6
通讯作者：
S. Masuda;Y. Osaka;T. Tsujiguchi;A. Kodama
中科院分区：
文献类型：
--
作者：
S. Masuda;Y. Osaka;T. Tsujiguchi;A. Kodama
研究了内加热和冷却的热摇摆吸附法对二氧化碳（CO2）的分离和回收。作为初步研究的一部分，研究了典型疏水吸附剂碳分子筛（CMS）和高硅沸石（HSZ）在模拟干燥废气中的co2捕获和富集性能，这表明沸石具有疏水行为。此外，还采用吸附剂CaA型沸石进行了比较。初步研究了再生温度和再生风量对分离性能的影响。总体而言，CaA型沸石吸附容量较大，具有较好的co2浓缩性能和回收率。HSZ与CMS的对比表明，HSZ对co2的分离和回收性能优于CMS。在80℃的再生温度下，得到了比原料气高4倍的co2浓度。此外，通过降低再生空气流量至吸附过程原料气的1/40，以降低co2回收率为交换条件，进一步富集了解吸出口的co2。相比之下，CMS只能产生3倍于原料气的富集co2浓度。富集的co2浓度几乎不受再生空气流量的影响。这是由于CMS对co2的选择性较低；解吸气体出口体积和co2浓度的时间曲线支持了这一解释。
This study focused on the carbon dioxide (CO2) separation and recovery by an internally heated and cooled thermal swing adsorption process. As part of the preliminary investigation, the CO2capture and enrichment performance of carbon molecular sieve (CMS), a typical hydrophobic adsorbent, and high silica zeolite (HSZ), which indicates hydrophobic behavior among zeolites, were examined in a simulated dry exhaust gas. In addition, the hydroscopic adsorbent, CaA type zeolite, was employed for comparison. The effects of the regeneration temperature and the regeneration air flow rate on the separation performance were primarily investigated. In general, the CaA type of zeolite indicated a greater CO2concentration performance and recovery ratio due to its relatively larger adsorption capacity. Comparison between HSZ and CMS showed that the CO2separation and recovery performance of HSZ were greater than that of CMS. A CO2concentration four times higher than that of the feed gas was obtained at a regeneration temperature of 80 °C. Moreover, further enrichment of CO2at the desorption outlet was achieved by reducing the regeneration air flow rate to 1/40 of the feed gas of the adsorption process in exchange for lowering the CO2recovery ratio. In contrast, CMS could only produce three times greater the concentration of enriched CO2when compared to the feed gas. The enriched CO2concentration was almost independent of the regeneration air flow rate. This behavior was due to a lower CO2adsorption selectivity of CMS; this interpretation was supported by time profiles of desorption gas outlet volume and the CO2concentration.