化学与湍流团聚耦合促进燃煤细颗粒物团聚与脱除

doi:10.11949/0438-1157.20191021

摘要/Abstract

摘要：

将化学团聚与湍流团聚技术耦合，实验研究了燃煤细颗粒物在化学与湍流团聚耦合作用下的团聚与脱除效果，以及颗粒物浓度、烟气温度、团聚液喷入量与烟气流速等因素对细颗粒物团聚与脱除效果的影响规律。结果表明，典型工况下化学-湍流耦合团聚能够进一步促进细颗粒物团聚长大以及静电除尘器对细颗粒物的脱除，其作用效果优于单独的化学与湍流团聚。随细颗粒物浓度的升高，团聚与脱除效率均逐渐下降，分别由49.2%与96.7%下降至35.3%与88.2%。随烟气温度与团聚液喷入量的增加，细颗粒物团聚与脱除效率均先升高后降低，并在180℃与12 L/h处达到最高值，团聚与脱除效率分别为44.7%与94.8%。随烟气流速的增加，细颗粒物团聚与脱除效率均逐渐升高，分别由30.5%与86.3%升高至50.2%与97.5%。

关键词: 气溶胶, 团聚, 化学喷雾, 湍流, 耦合, 脱除

Abstract:

By coupling the chemical agglomeration and turbulent agglomeration technology, the agglomeration and removal characteristics of coal-fired fine particles under the coupling effect of chemical and turbulent agglomeration, as well as the influence of particle concentration, flue gas temperature, flow rate of chemical agglomeration solution and flue gas velocity on them were studied experimentally. The results show that the chemical turbulence coupling agglomeration can further promote the agglomeration and growth of fine particles and the removal of fine particles by electrostatic procipitator under typical conditions, and its effect is better than that of the chemical turbulence agglomeration alone. With the increase of fine particle concentration, the agglomeration and removal efficiency decreased gradually, from 49.2% and 96.7% to 35.3% and 88.2% respectively. With the increase of flue gas temperature and flow rate of chemical agglomeration solution, the agglomeration and removal efficiency of fine particles first increased and then decreased, and they reached the maximum value at 180℃ and 12 L/h, which were 44.7% and 94.8%. With the increase of flue gas velocity, the agglomeration and removal efficiency of fine particles increased gradually, from 30.5% and 86.3% to 50.2% and 97.5% respectively.

Key words: aerosol, agglomeration, chemical spray, turbulent flow, coupling, removal

中图分类号:

X 51

孙宗康, 张笑丹, 杨林军, 陈帅, 吴新. 化学与湍流团聚耦合促进燃煤细颗粒物团聚与脱除[J]. 化工学报, 2020, 71(3): 1317-1325.

Zongkang SUN, Xiaodan ZHANG, Linjun YANG, Shuai CHEN, Xin WU. Promoting the agglomeration and removal of coal-fired fine particles by coupling of chemical and turbulent agglomeration[J]. CIESC Journal, 2020, 71(3): 1317-1325.

图/表 11

图1 化学-湍流耦合团聚实验系统

Fig.1 Schematic diagram of chemical-turbulent agglomeration experiment system

图2 化学团聚剂液滴粒径分布

Fig.2 Size distribution of chemical agglomeration droplets

图3 湍流聚并器结构

Fig.3 Structure of turbulent coalescer

图4 细颗粒物浓度变化

Fig.4 Changes in concentration of fine particles

图5 细颗粒物粒径分布变化

Fig.5 Changes in size distribution of fine particles

图6 不同团聚方式后ESP出口细颗粒物浓度

Fig.6 Concentration of fine particles at outlet of ESP after different agglomeration modes

图7 不同团聚方式后细颗粒物分级脱除效率

Fig.7 Particle stage removal efficiency after different agglomeration modes

图8 不同颗粒物浓度下细颗粒物团聚与脱除效率

Fig.8 Agglomeration and removal efficiency of fine particles at different concentrations

图9 不同烟气温度下细颗粒物团聚与脱除效率

Fig.9 Agglomeration and removal efficiency of fine particles at different flue gas temperatures

图10 不同团聚液喷入量下细颗粒物团聚与脱除效率

Fig.10 Agglomeration and removal efficiency of fine particles at different flow rates of chemical solution

图11 不同烟气流速下细颗粒物团聚与脱除效率

Fig.11 Agglomeration and removal efficiency of fine particles at different flue gas velocities

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