Mercury removal by CaSO4 oxygen carrier during in-situ gasification and chemical-looping combustion of coal

被引：0

作者：

Fan Y. ^{[1
]}

Jin J. ^{[1
]}

Liu D. ^{[1
]}

Wang J. ^{[2
]}

Liu Q. ^{[1
]}

Xu K. ^{[1
]}

机构：

[1] School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai

[2] State Key Laboratory of Efficient and Clean Coal-Fired Utility Boilers, Harbin Boiler Company Limited, Heilongjiang, Harbin

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 03期

关键词：

CaSO[!sub]4[!/sub; chemical-looping combustion; circulating fluidized bed; coal combustion; gasification; mercury; oxygen carrier;

D O I：

10.16085/j.issn.1000-6613.2022-0901

中图分类号：

学科分类号：

摘要：

To understand the mechanism of mercury removal by oxygen carriers during in-situ gasification and chemical-looping combustion of coal, we used CaSO4 as oxygen carrier and CO2 and water vapor as gasification medium in a reduction reactor working at 900℃ . Results showed that the CaSO4 oxygen carrier itself promoted the oxidation of Hg0, but the SO2 produced by the decomposition of CaSO4 inhibited the oxidation of Hg0. CaSO4 promoted the chemical-looping combustion of coal to produce element S, which would further react with Hg0 to generate a variety of complex HgSn. This, reduced the Hg0 content in the flue gas and improved the mercury removal efficiency. In addition, the CaSO4 oxygen carrier has good cycle characteristics in the reduction-oxidation cyclic reactions, indicating an excellent chemical-looping oxygen carrier. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：1638 / 1648

页数：10

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