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Evaluation of dual-bed pressure swing adsorption for CO_2 recovery from boiler exhaust gas

机译：双床变压吸附法从锅炉废气中回收CO_2的评价

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摘要

Dual-bed CO_2 adsorption using zeolite was studied experimentally experimentally and theorethically. Boiler exhaust gas (13 vol% CO_2, 79 vol% N_2 and 8 vol% O_2) was used as a feed gas for the eight-step four-step four-bed PSA process. Na-X type zeolite (NaX) and Na-A type zeolie (NaA) were selected in the break-through test. NaX has higher CO_2 adsorption capacity than other adsorbents. NaA has the highest selectivity among all adsorbents tested. In the simulations, a NaX-to-NaA ratio affected the recovery efficiency and the concentration of recovery gas. Moreover, in the dual-bed PSA process of NaX-to-NaA ratio = 2/1, the recovery efficiency and CO_2 concentration of recovry gas were higher than those in a single adsorbent PSA process. Simulated results by the dynamic model agreed well with the PSA experimental results.
机译：从理论上和实验上研究了沸石对CO_2的吸附作用。锅炉废气（13％（体积）的CO_2、79％（体积）的N_2和8％（体积）的O_2）被用作八步四步四床变压吸附工艺的进料气。在突破测试中选择了Na-X型沸石（NaX）和Na-A型沸石（NaA）。 NaX具有比其他吸附剂更高的CO_2吸附能力。在所有测试的吸附剂中，NaA的选择性最高。在模拟中，NaX与NaA的比率影响了回收效率和回收气体的浓度。此外，在NaX与NaA之比= 2/1的双床PSA工艺中，回收气和回收气的CO_2浓度高于单吸附PSA工艺。动态模型的仿真结果与PSA实验结果非常吻合。

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