AN Yang, YUAN Sijie, WU Man, WANG Lingyun, GUO Qingjie

(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: In order to promote the deep reduction of Fe-based oxygen carrier and increase the yield of hydrogen, an enhanced coal chemical looping hydrogen generation(enhanced coal CLHG)was proposed by optimizing the reaction process.Fe-based oxygen carrier was prepared by impregnation method.Using Meihuajing bituminous coal as raw material, the effect of the mass ratio of coal and Fe-based oxygen carrier on the enhanced coal CLHG was studied on a fixed bed.The hydrogen generation of two-reactor, three-reactor and enhanced chemical looping hydrogen generation processes in six cycles of experiments were compared.The results show that when the mass ratio of coal to oxygen carrier is 1∶15, the maximum hydrogen yield is 1.74 L/g.The Fe-based oxygen carrier in the enhanced coal CLHG is more reduced to FeO or Fe, and the degree of reduction is deepened.At the same time, the carbon residue in the reduction stage is further reacted in the steam oxidation stage, making the hydrogen production 18.4% higher than that of the three-reactor coal CLHG.In the 6-cycle experiment, the carbon conversion rate of the enhanced coal CLHG is not much different from that of the three-reactor coal CLHG, which is much higher than that of the two-reactor coal CLHG.The hydrogen production of the enhanced coal CLHG is always higher than that of the two-reactor coal CLHG and the three-reactor coal CLHG.The maximum hydrogen output in a single cycle of the enhanced coal CLHG is 1.76 L/g, and the cumulative hydrogen output of the cycle is 9.54 L.The enhanced coal CLHG shortens the hydrogen production time, and the hydrogen production capacity is more excellent.

Keywords: Fe-based oxygen carrier; enhanced coal；chemical looping hydrogen generation; two-reactor; three-reactor

中图分类号： TQ116.2                            文献标志码：A

文章编号：1008-5548(2022)01-0087-08

DOI:10.13732/j.issn.1008-5548.2022.01.010

收稿日期： 2021-04-19，修回日期：2021-10-12，在线出版时间：2021-12-01。

基金项目：国家自然科学基金联合基金重点项目，编号：U20A20124；国家重点研发计划项目，编号：2018YFB0605401；宁夏回族自治区重点研发计划(重大科技)项目，编号：2018BCE01002。

第一作者简介：安阳(1996—)，男，硕士研究生，研究方向为煤炭清洁利用。E-mail：ayaaa@126.com。

通信作者简介：郭庆杰(1967—)，男，教授，博士，博士生导师，研究方向为煤炭清洁利用。E-mail：qj_guo@yahoo.com。