Separation of hydrogen from syngas using a regenerative system

被引:58
作者
Campen, Adam [2 ]
Mondal, Kanchan [2 ]
Wiltowski, Tomasz [1 ,2 ]
机构
[1] So Illinois Univ, Coal Res Ctr, Carbondale, IL 62901 USA
[2] So Illinois Univ, Dept Mech Engn & Energy Proc, Carbondale, IL 62901 USA
关键词
hydrogen; syngas; coal;
D O I
10.1016/j.ijhydene.2007.07.016
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A method of separating hydrogen from syngas for use as a carbon-free energy carrier is reported. The overall process consists of a hydrogen enrichment step and a solids regeneration step in a lab-scale, fixed-bed reactor under atmospheric pressure. During the enrichment step, syngas and steam are passed through iron oxide and calcium oxide beds where multiple reactions occur simultaneously to yield a stream of hydrogen. The syngas and steam feeds are then replaced by air to regenerate the solids, releasing sequestration-ready carbon dioxide. The effects of moderate temperatures (600-800 degrees C), steam concentration, syngas concentration, residence time, and solids composition on hydrogen purity were studied. The information obtained was used to optimize the process and achieve a 99% hydrogen stream. Ten cycles using the same solids were completed with a minimal loss in performance observed. (C) 2007 International Association for Hydrogen Energy.
引用
收藏
页码:332 / 339
页数:8
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