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Enhancement mechanism of SO_2 removal with calcium hydroxide in the presence of NO_2

机译：NO_2存在下用氢氧化钙去除SO_2的增强机理

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摘要

The enhancement mechanism of SO_2 removal by the presence of NO_2 under low temperature and humid conditions was studied in a fixed bed reactor system. The presence of NO_2 in the flue gas can enhance SO_2 removal. The interaction between SO_2 and NO_2 in gas phase could not explain the effect of NO_2 on SO_2 removal under low-temperature and humid conditions. When Ca(NO_3)_2 and Ca(NO_2)_2 as additive were added on the surface of sorbent, the desulfurization activity of sorbent decreased. However, the sorbent pretreated by NO_2 for a moment has higher SO_2 removal. The oxidization of SO_3~(2-) to SO_4~(2-) and the evolution of sorbent surface structure in the presence of NO_2 can explain die enhancement of SO_2 removal by the presence of NO_2. HSO_3~- and SO_3~- reacted with NO_2 to form sulfate, which can accelerate the hydrolysis of SO_2. The reaction between NO_2 and Ca(OH)_2 can make the unreacted sorbet under the SO_2 removal product exposed to the reactant gas.
机译：在固定床反应器系统中研究了在低温高湿条件下通过存在NO_2去除SO_2的增强机理。烟气中NO_2的存在可以提高SO_2的去除率。气相中SO_2与NO_2之间的相互作用不能解释低温低湿条件下NO_2对SO_2去除的影响。在吸附剂表面添加Ca（NO_3）_2和Ca（NO_2）_2作为添加剂时，吸附剂的脱硫活性降低。但是，用NO_2预处理的吸附剂具有较高的SO_2去除率。在存在NO_2的情况下，SO_3〜（2-）氧化为SO_4〜（2-）以及吸附剂表面结构的演变可以解释NO_2的存在对SO_2去除的促进作用。 HSO_3〜-和SO_3〜-与NO_2反应生成硫酸盐，从而促进SO_2的水解。 NO_2与Ca（OH）_2之间的反应可使未反应的冰糕在SO_2去除产物下暴露于反应气体中。

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  • 来源
    《The Korean journal of chemical engineering》 |2012年第2期|p.263-269|共7页
  • 作者

    Jihui Gao; Guoqing Chen; Xiaolin Fu; Yijun Yin; Shaohua Wu; Yukun Qin;

  • 作者单位

    School of Energy Science and Engineering, Harbin Institute of Technology,92, West Dazhi Street, Harbin 150001, Heilongjiang Province, P. R. China;

    School of Energy Science and Engineering, Harbin Institute of Technology,92, West Dazhi Street, Harbin 150001, Heilongjiang Province, P. R. China;

    ShanDong Electric Power Engineering Consulting Institute Corp., Ltd. (SDEPCI),106, Minziqian Road, Jinan 250013, Shandong Province, P. R. China;

    School of Energy Science and Engineering, Harbin Institute of Technology,92, West Dazhi Street, Harbin 150001, Heilongjiang Province, P. R. China;

    School of Energy Science and Engineering, Harbin Institute of Technology,92, West Dazhi Street, Harbin 150001, Heilongjiang Province, P. R. China;

    School of Energy Science and Engineering, Harbin Institute of Technology,92, West Dazhi Street, Harbin 150001, Heilongjiang Province, P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SO_2 and NO_2; desulfurization; denitrification; flue gas; calcium hydroxide;

    机译：SO_2和NO_2;脱硫反硝化烟气氢氧化钙;

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