化学链重整直接制氢技术进展

doi:10.11949/j.issn.0438-1157.20150810

摘要/Abstract

摘要：

化学链重整直接制氢技术使用固态金属氧化物作为氧载体代替传统重整过程中所需的水蒸气或纯氧,将燃料直接转化为高纯度的合成气或者二氧化碳和水,被还原的金属氧化物则可以与水蒸气再生并直接产生氢气,实现了氢气的近零能耗原位分离,是一种绿色高效的新型制氢过程。根据产物和供热方式的不同,可以将化学链重整直接制氢工艺分为双床系统和三床系统两类,并对各系统中氧载体与反应器的设计与选择进行了分析。通过Elingham图对不同氧载体的氧化还原能力进行比较,选取适于直接制氢的金属氧化物,并讨论了氧载体材料研发的最新进展。化学链制氢反应器设计应根据不同原料和产品的特点,选择合适的气-固接触方式,以强化化学链重整直接制氢效率。

关键词: 制氢, 合成气, 二氧化碳捕集, 化学链, 重整

Abstract:

Chemical looping reforming (CLR) technology is a clean and efficient fuel conversion process for direct hydrogen production by using solid metal oxides. Instead of the traditional use of steam or pure oxygen, solid metal oxides are typically used as oxygen carriers to convert carbonaceous fuel to syngas or CO₂/H₂O. The reduced oxygen carrier then reacts with the steam for directly generating H₂, which is separated in situ with near zero energy consumption. Based on the need for different products and the different heat supply methods, both two-reactor and three-reactor CLR systems have been discussed, with a focus on the characteristics of oxygen carriers and reactor design. The Elingham diagram is used to compare the redox properties of various metal oxides, and to guide the selection of suitable oxygen carriers for direct hydrogen production. Recent oxygen carrier development is also discussed to investigate the strategies for improving H₂ selectivity and yield. The gas solid contacting pattern should be carefully selected when designing CLR reactors with various kinds of feed fuels and target products.

Key words: hydrogen production, syngas, CO₂ capture, chemical looping, reforming

中图分类号:

TQ028.8

曾亮, 巩金龙. 化学链重整直接制氢技术进展[J]. 化工学报, 2015, 66(8): 2854-2862.

ZENG Liang, GONG Jinlong. Advances in chemical looping reforming for direct hydrogen production[J]. CIESC Journal, 2015, 66(8): 2854-2862.

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