化工进展 ›› 2023, Vol. 42 ›› Issue (3): 1638-1648.DOI: 10.16085/j.issn.1000-6613.2022-0901

• 资源与环境化工 • 上一篇    下一篇

CaSO4载氧体在煤气化化学链燃烧中的脱汞

范昀培1(), 金晶1(), 刘敦禹1, 王静杰2, 刘秋祺1, 许开龙1   

  1. 1.上海理工大学能源与动力工程学院,上海 200093
    2.哈尔滨锅炉厂有限责任公司高效清洁燃煤电站锅炉国家 重点实验室,黑龙江 哈尔滨 150046
  • 收稿日期:2022-05-16 修回日期:2022-07-19 出版日期:2023-03-15 发布日期:2023-04-10
  • 通讯作者: 金晶
  • 作者简介:范昀培(1996—),男,硕士研究生,研究方向为清洁燃烧。E-mail:792337631@qq.com
  • 基金资助:
    国家自然科学基金(51706143);上海市自然科学基金(21ZR1444400);上海市科委地方能力建设项目(23010503500)

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

FAN Yunpei1(), JIN Jing1(), LIU Dunyu1, WANG Jingjie2, LIU Qiuqi1, XU Kailong1   

  1. 1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.State Key Laboratory of Efficient and Clean Coal-Fired Utility Boilers, Harbin Boiler Company Limited, Harbin 150046, Heilongjiang, China
  • Received:2022-05-16 Revised:2022-07-19 Online:2023-03-15 Published:2023-04-10
  • Contact: JIN Jing

摘要:

为了研究载氧体在煤气化化学链燃烧中的脱汞机理,选择CaSO4载氧体作为研究对象,900℃的反应温度下,在还原反应器中通入CO2气体和水蒸气作为气化介质进行实验。结果表明:以CaSO4作为载氧体的煤气化化学链燃烧中,CaSO4载氧体本身促进Hg0的氧化,但CaSO4分解产生的SO2抑制Hg0的氧化。CaSO4促进煤气化化学链燃烧产生S单质,会进一步与Hg0反应生成多种复杂的HgS n,降低了烟气中Hg0含量,提高了脱汞效率。同时CaSO4载氧体在还原-氧化的循环反应中具有良好的循环特性,是一种优良的化学链载氧体。

关键词: 化学链燃烧, 汞, 载氧体, 硫酸钙, 煤燃烧, 循环流化床, 气化

Abstract:

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 HgS n . 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.

Key words: chemical-looping combustion, mercury, oxygen carrier, CaSO4, coal combustion, circulating fluidized bed, gasification

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