摘要
归纳总结了化学链技术在制氢方面的研究和应用,目前主要应用方式有三种:化学链重整制氢(CLR)、钙链循环制氢(Ca-CLP)、化学链制氢(CLHG)。为制得高纯氢气CLR和Ca-CLP都需要水汽变换、变压吸附等后续处理过程,而CLHG在实现CO_2捕集的同时不需要额外的氢气净化过程,优势明显。氧载体的选择、制备和反应器结构设计是CLHG的关键。与其它氧载体相比,由于铁基氧载体具有制氢效率高、廉价易得、环境友好度高等特点更适合CLHG过程。而未经修饰的铁基氧载体容易失活,通过添加惰性组分和其它金属元素能增加其可循环性、抗积碳性、反应性。气固两相的热力学特性分析有助于CLHG反应器的设计,气固逆流接触的两段流化床和移动床两类反应器适合CLHG过程。以煤为燃料的CLHG过程将是化学链制氢的重要研究方向。
Research and application of chemical looping for hydrogen generation are summarized. Up to now,three main application modes for hydrogen generation,namely chemical looping reforming( CLR),calcium looping cycle for the production of hydrogen( Ca-CLP) and chemical looping hydrogen generation( CLHG) have been developed. In order to generate pure hydrogen,Unlike CLR and Ca-CLP,CLHG requires no additional gas treatment such as water-gas shift reaction and pressure swing adsorption to generate pure hydrogen. The selection of oxygen carrier and design of reactor structure are the key factors of CLHG development. Fe-based oxygen carrier is more appropriate for CLHG than others due to the high hydrogen production efficiency,environmentally friendliness and free availability. Fe-based oxygen carriers without any modification show a poor thermostability and the addition of inert components and other metal can improve the ability of resistance carbon deposition,cyclic stability and reactivity. The thermal analyses of gas and solid in CLHG reactor contribute significantly to its design. Two-stage fludized-bed and moving bed with the gas-solid counter-current flow pattern are fit for CLHG. The CLHG using coal as fuel is one of the most important direction.
出处
《应用化工》
CAS
CSCD
北大核心
2017年第11期2215-2222,共8页
Applied Chemical Industry
基金
国家自然科学基金(21506241)
关键词
化学链制氢
氧载体
移动床
流化床
氢气
chemical looping for hydrogen production
oxygen carrier
moving bed
fluidized bed
hydrogen
