Numerical simulation on agglomerating behaviors of ultrafine particles

PAN Siwei; MA Siming; YANG Jianping; ZHANG Kai; LI Li; ZHANG Junying; ZHAO Yongchun

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Numerical simulation on agglomerating behaviors of ultrafine particles

更新时间：2025-09-28

- Numerical simulation on agglomerating behaviors of ultrafine particles
- Thermal Power Generation Vol. 45, Issue 9, Pages: 44-50(2016)
- 作者机构：
  
  1. 广东电网有限责任公司电力科学研究院
  2. 华中科技大学煤燃烧国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： X773
- Published：2016
- 稿件说明：
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PAN Siwei, MA Siming, YANG Jianping, et al. Numerical simulation on agglomerating behaviors of ultrafine particles[J]. Thermal power generation, 2016, 45(9): 44-50.
DOI：

PAN Siwei, MA Siming, YANG Jianping, et al. Numerical simulation on agglomerating behaviors of ultrafine particles[J]. Thermal power generation, 2016, 45(9): 44-50. DOI：

摘要

针对燃煤电厂现有除尘设备的超细颗粒物脱除效率偏低

大量超细颗粒物排放造成严重的环境污染问题

采用化学团聚促进超细颗粒物团聚长大

可有效提高超细颗粒物脱除效率。本文选用絮凝模型蒙特卡罗算法

在考虑液滴破碎和不考虑液滴破碎情况下研究超细颗粒团聚絮凝过程中尺度分布、颗粒数目和颗粒平均粒径在不同团聚剂流量下的变化。结果表明:团聚剂流量较小时

液滴数目较少

会影响颗粒与液滴间的吸附

团聚剂对颗粒团聚促进作用不明显;但团聚剂流量过大会增加液滴间的吸附

增大液滴的平均粒径

降低颗粒与液滴吸附的机率

降低团聚效果。因此

选择合理的团聚剂流量是获得良好团聚效果的关键。

Abstract

The capture efficiency of ultra fine particles in air pollution control devices of present coal-fired power plants are relatively low.The emission of ultrafine particles caused serious environmental pollution.To solve this problem

the chemical agglomeration method was proposed

which can make the ultrafine particles grow up and thus to enhance the ultrafine particles removal efficiency.The flocculation model combining the Monte Carlo algorithm was used to simulate the changes of particle size distribution

number and average diameter

under conditions considering and not considering the droplet fragmentation.The results show that

small agglomeration agent amount will decrease the number of droplets

affecting the adsorption of particle on droplets.Thus

the role of agglomeration agent in agglomeration will be not obvious.However

too much agglomeration agent will increase the adsorption interaction between droplets.This will decrease the chance of adsorption between particles and droplets

increase the average size of droplets

and weakening the agglomeration of particles.Therefore

appropriate flow rate of agglomeration agent is the key factor for determining the agglomeration of particle.

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