Biomass chemical looping gasification for syngas production using modified hematite as oxygen carriers  

作　　者：Cong Jiang Xiaoyu Jin Tingting Xu Bo Xiao Zhiquan Hu Xun Wang 

机构地区：[1]School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Journal of Environmental Sciences》2023年第3期171-184,共14页环境科学学报（英文版）

基　　金：supported by National Natural Science Foundation of China (Nos. 22005112, 22109048 and 21975089);China Postdoctoral Science Foundation (No. 2021M691121)。

摘　　要：Syngas is a clean energy carrier and a major industrial feedstock. In this paper, syngas was produced via biomass chemical looping gasification(CLG) process. Hematite, the most common Fe-based oxygen carrier(OC), was modified with different metal oxides(CeO_(2), CaO and MgO) by the impregnation method. The hematite modified by CeO_(2), CaO and MgO was namely as CeO_(2)-hematite(CeO_(2)-H), CaO-hematite(CaO-H) and MgO-hematite(MgO-H), respectively. The introduction of CeO_(2), CaO and MgO enhanced the reactivity of lattice oxygen of hematite. The optimum condition for syngas production had been explored as the mass ratio of oxygen carrier to biomass(O/B) of 0.2, the mass ratio of steam to biomass(S/B) of0.75 and temperature of 800℃in the biomass CLG process. The CeO_(2)-H exhibited the most wonderful performance compared to that for CaO-H and MgO-H. The crystal composition of OC influenced greatly in the CLG process. CeFeO_(3)had a good oxygen mobility property and lattice oxygen releasing capacity due to the most oxygen vacancy distributed on the OC surface and the most active lattice oxygen, which is conducive to the biomass chemical looping gasification process for syngas production, leading to the highest gasification efficiency of 95.86% and gas yield of 1.20 m^(3)/kg of the three. Cyclic test proved that CeO_(2)-H had well sintering resistance and cyclic performance.

关 键 词：Chemical looping gasification Oxygen carrier SYNGAS Modified hematite Pine sawdust 

分 类 号：TE665.3[石油与天然气工程—油气加工工程]