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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第1期    总第293期    2019年1月

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文章编号:1672-7207(2019)01-0023-06
基于石灰石法脱硫浆液的K2S2O8氧化Hg0性能
田立江,刘秉坤,李杰,沈晓玲

(中国矿业大学 环境与测绘学院,江苏 徐州,221116)

摘 要: 利用改进的Hg0液相氧化反应器,考察脱硫浆液pH、K2S2O8浓度、金属离子浓度、入口烟气Hg0和SO2质量浓度对氧化Hg0性能的影响。研究结果表明:低pH有利于K2S2O8高效氧化Hg0,pH在5.0左右时,Hg0氧化效率能维持在83%以上。K2S2O8浓度在5 mmol/L时,Hg0氧化效率高于90%并呈现很好的运行稳定性。Mn2+,Ag+或Co2+的存在均可提高Hg0氧化性能,但提高K2S2O8浓度至5 mmol/L也能达同等效果。Hg0氧化效率随浆液Fe3+浓度的增加先增加后趋于稳定,当Fe3+浓度增至2.0 mmol/L以上时,Hg0氧化效率再次增加;Mg2+的存在反而使Hg0性能有所降低。Hg0氧化效率随烟气SO2质量浓度的升高先增加后逐渐下降,最高可达85.57%,且SO2的存在增强了系统Hg0氧化的稳定性。

 

关键字: 石灰石-石膏法;脱硫浆液;燃煤烟气;汞氧化

Characteristics of Hg0 oxidation by K2S2O8 based on limestone-gypsum desulfurization slurry
TIAN Lijiang, LIU Bingkun, LI Jie, SHEN Xiaoling

School of Environment Science & Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

Abstract:The effects of slurry pH, K2S2O8 concentration, metallic ion concentration, inlet flue gas Hg0 and SO2 mass concentration on Hg0 oxidation were studied based on the modified liquid reactor. The results show that low value of slurry pH is propitious to oxidize Hg0, and the oxidation efficiency can maintain above 83% when the value of pH keeps around 5.0. The oxidation efficiency of Hg0 can be higher than 90% and keeps stable steadily when K2S2O8 concentration reaches 5 mmol/L. The existence of Mn2+, Ag+ or Co2+ can improve the Hg0 oxidation capability while it can acquire the same outcome through increasing the K2S2O8 concentration to 5 mmol/L. With the increase of Fe3+ concentration, the Hg0 oxidation efficiency rises firstly, then becomes steady, but the efficiency rises again when the Fe3+ concentration is higher than 2.0 mmol/L. The existence of Mg2+ does not enhance the Hg0 oxidation but weakens the oxidation capability. Hg0 oxidation efficiency rises firstly and then descends gradually, and the highest efficiency can reach 85.57% with the increase of flue gas SO2 mass concentration. The existence of SO2 can enhance the stabilization of the system about Hg0 oxidation.

 

Key words: limestone-gypsum method; desulfurization slurry; coal fired flue gas; mercury oxidation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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