| 温度对载氧体还原过程中汞的析出特性及形态分布的影响 |
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| 引用本文： | 张志越,毛琳,孙佳兴,周长松,姜小祥,杨宏旻. 温度对载氧体还原过程中汞的析出特性及形态分布的影响[J]. 化工进展, 2018, 37(3): 1187-1193. DOI: 10.16085/j.issn.1000-6613.2017-1117 |
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| 作者姓名： | 张志越 毛琳 孙佳兴 周长松 姜小祥 杨宏旻 |
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| 作者单位： | 南京师范大学能源与机械工程学院, 江苏 南京 210042 |
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| 基金项目： | 国家自然科学基金（51676101）及江苏省自然科学基金（BK20161558）项目。 |
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| 摘 要： | 化学链燃烧是近年来提出的一种具有高效、内分离CO2特点的新型燃烧方式。本文在立式管式炉实验装置上研究了温度对基于Fe2O3载氧体的煤化学链燃烧载氧体还原过程中汞析出特性的影响，探讨了不同燃烧温度下燃料反应器（FR）出口烟气组分的变化及其对汞迁移变化的影响。结果表明：在高温条件下（≥ 800℃），煤中的汞在载氧体还原过程中基本全部析出，180s时基本达到90%，并且随着温度升高而增加；FR出口烟气中的汞主要以单质态（Hg0）形式存在，各工况下的单质态汞占烟气中气态总汞比例都在88%以上，随着温度的升高，烟气中Hg0/HgT略有降低；温度对烟气组分具有影响，随着温度的升高，CO、NO和SO2浓度上升；对于汞而言，SO2会抑制Cl及Cl2的形成从而抑制Hg0向Hg2+转化，NO会直接或间接促进汞的氧化过程，FR烟气中以CO为主的还原性气氛不利于汞的氧化。
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| 关 键 词： | 煤 还原 化学链燃烧 汞释放 Fe2O3载氧体 |
| 收稿时间： | 2017-06-08 |
Characterization of mercury releasing during reduction of oxygen carriers with coal in chemical looping combustion |
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| ZHANG Zhiyue,MAO Lin,SUN Jiaxing,ZHOU Changsong,JIANG Xiaoxiang,YANG Hongmin. Characterization of mercury releasing during reduction of oxygen carriers with coal in chemical looping combustion[J]. Chemical Industry and Engineering Progress, 2018, 37(3): 1187-1193. DOI: 10.16085/j.issn.1000-6613.2017-1117 |
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| Authors: | ZHANG Zhiyue MAO Lin SUN Jiaxing ZHOU Changsong JIANG Xiaoxiang YANG Hongmin |
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| Affiliation: | School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, Jiangsu, China |
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| Abstract: | Chemical looping combustion is one of the promising technologies to capture CO2 with low cost. The effect of temperatures on mercury speciation and transport during coal chemical looping combustion based on Fe2O3 oxygen carriers were studied in a vertical tube furnace device. The change of flue gas components at different temperatures and the oxidation mechanism of elemental mercury on flue gas from fuel reactor were also investigated. The results showed that mercury in coal was completly released and the discharge rate reached 90% in 180s at high temperature in FR. The major mercury species was Hg0 and the ratio Hg0/HgT was 88%. The rate of Hg0/HgT decreased with increasing temperature. Different temperature affected the components of flue gas. The elevated temperature could cause an increase in the SO2,NO and CO. SO2 could inhibit the oxidation of mercury by inhibiting the formation of Cl/Cl2. The NO could promote the oxidation of mercury,but CO had an opposite effect. |
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| Keywords: | coal reduction chemical looping combustion mercury release Fe2O3 oxygen carriers |
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