燃烧和反应

Heavy Metal Migration Characteristics of Co-Combustion between Sewage Sludge and High Alkaline Coal on Circulating Fluidized Bed

  • LI Yaode ,
  • YANG Dong ,
  • ZHOU Xihong ,
  • DONG Le ,
  • SUO Lihui ,
  • SUN Wenbo
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  • 1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China 
    2. College of Energy & Power Engineering, Northeast Electric Power University, Jilin 132000, China

网络出版日期: 2023-12-04

基金资助

This research was supported by the National Natural Science Foundation of China (No. 52076172).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Heavy Metal Migration Characteristics of Co-Combustion between Sewage Sludge and High Alkaline Coal on Circulating Fluidized Bed

  • LI Yaode ,
  • YANG Dong ,
  • ZHOU Xihong ,
  • DONG Le ,
  • SUO Lihui ,
  • SUN Wenbo
Expand
  • 1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China 
    2. College of Energy & Power Engineering, Northeast Electric Power University, Jilin 132000, China

Online published: 2023-12-04

Supported by

This research was supported by the National Natural Science Foundation of China (No. 52076172).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

通过实验和模拟研究了循环流化床内污泥与高碱煤共燃过程中重金属的迁移特性。温度对重金属的热力学平衡分布和迁移特性起着至关重要的作用。在700℃-1200℃的温度范围内,Hg完全为气态,且Pb、Ni、Cd在气相中的比例也较高。As在系统中以单质为主,Cr在固相中所占比例较大。锌化合物是多种固体物质的混合物。Cu的挥发性不强,当温度超过1700℃时就会变成气态。重金属在气相中的比例随着过量空气系数的增加而降低。在富氧的氛围中,大部分锌和镍转化为氧化物;铅和镉转化为结晶硅酸盐;铜转化为部分铝酸盐;Cr化合物分解生成Cr2O3;这都有利于重金属的凝固和控制。单质Hg被转化为HgCl2,元素As被转化为AsCl3。温度对重金属的挥发率也有很大的影响。温度越高,达到最大挥发性的时间越短。

本文引用格式

LI Yaode , YANG Dong , ZHOU Xihong , DONG Le , SUO Lihui , SUN Wenbo . Heavy Metal Migration Characteristics of Co-Combustion between Sewage Sludge and High Alkaline Coal on Circulating Fluidized Bed[J]. 热科学学报, 2022 , 31(6) : 2178 -2188 . DOI: 10.1007/s11630-022-1695-5

Abstract

The migration characteristics of heavy metals in co-combustion of sewage sludge and high alkali coal in circulating fluidized bed were studied by experiments and simulations. Temperature plays a crucial role in thermodynamic equilibrium distribution and migration characteristics of heavy metals. At the temperature range of 700°C–1200°C, Hg is completely gaseous and the proportion of Pb, Ni, and Cd in the gas phase is also high. As is mainly elemental in the system, and the proportion of Cr in the solid phase is large. Zn compounds are diverse and mostly solid materials. The volatility of Cu is not strong, and it will become gaseous when the temperature exceeds 1700°C. The proportion of heavy metals in the gas phase decreases as the excess air ratio increases. In an oxygen-rich atmosphere, most of Zn and Ni are converted to oxides; Pb and Cd are converted to crystalline silicate; Cu is converted to partial aluminate; Cr compound is decomposed to form Cr2O3; they are good for the solidification and controlling of heavy metals. The elemental Hg is converted to HgCl2 and the elemental As is converted to AsCl3. Temperature also has a great influence on the volatilization rate of heavy metals. The higher the temperature, the shorter the time they reach the maximum volatility.

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