期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 43, 期 29, 页码 13305-13317出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.05.030
关键词
Elevated temperature pressure swing adsorption; Potassium-promoted hydrotalcite; CO deep purification; Hydrogen production; Process optimization; Fuel cell
资金
- Shanxi Province Science and Technology Major Projects [MH2015-06]
- National Key R&D Program of China [2017YFB0601900]
Purification of CO and CO2 to the ppm level in H-2-rich gas without losing H-2 is one of the technical difficulties for fuel cell power systems. In this work, a two-column seven-step elevated temperature pressure swing system with high purification performance was proposed. The concept of reactive separation by adding water gas shift catalysts into the columns filled with elevated temperature CO2 adsorbents was adopted. The H-2 recovery ratio and H-2 purity were greatly improved by the introduction of steam rinse and steam purge, which could be realized due to the increasing operating temperature (200-450 degrees C). An optimized operating region to both achieve high efficiency and low energy consumption was proposed. The optimized case with 0.09 purge-to-feed ratio and 0.15 rinse-to-feed ratio could achieve 99.6% H-2 recovery ratio and 99.9991% H-2 purity at a stable state for a feed gas containing 1% CO, 1% CO2, 10% H2O, and 88% H-2, No performance degradation was observed for at least 1000 cycles. The proposed (ET-PSA) system possessed self-purification ability while the columns were penetrated by CO2. It is however suggested that periodical heat regeneration should be adopted to accelerate performance recovery during long-term operation. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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