Relationship between fine particle emission and droplets during limestone-gypsum WFGD process

HOU Dawei; PAN Danping; ZHOU Xincheng; HUANG Rongting; SHEN Kai; YANG Linjun

doi:10.11949/j.issn.0438-1157.20171000

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Relationship between fine particle emission and droplets during limestone-gypsum WFGD process

更新时间：2025-12-10

- Relationship between fine particle emission and droplets during limestone-gypsum WFGD process
- CIESC Journal Issue 4, Pages: 1714-1722(2018)
- 作者机构：
  
  东南大学能源热转换及其过程测控教育部重点实验室,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171000
  CLC： 51
- Online First：05 April 2018，
  
  Published：05 April 2018
- 稿件说明：
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HOU Dawei, PAN Danping, ZHOU Xincheng, et al. Relationship between fine particle emission and droplets during limestone-gypsum WFGD process[J]. CIESC Journal, 2018, (4): 1714-1722.
DOI：

HOU Dawei, PAN Danping, ZHOU Xincheng, et al. Relationship between fine particle emission and droplets during limestone-gypsum WFGD process[J]. CIESC Journal, 2018, (4): 1714-1722. DOI： 10.11949/j.issn.0438-1157.20171000.

摘要

脱硫浆液的雾化夹带是导致石灰石-石膏法脱硫过程中细颗粒物排放特征发生显著变化的主要原因。利用相位多普勒粒度分析仪（PDA）、电称低压冲击器（ELPI+）在线测试分析了脱硫浆液雾化、夹带特性及其与细颗粒物排放的关系。结果表明，石灰石-石膏法烟气脱硫过程中浆液雾化夹带可导致脱硫净烟气中含大量细小雾滴及亚微米级细颗粒，脱硫净烟气中雾滴粒径与喷嘴的雾化效果有关，主要集中在20 μm以下，雾滴含固量为脱硫浆液的20%～40%。脱硫操作参数如空塔气速、液气比和浆液浓度对脱硫净烟气中的雾滴夹带量存在显著影响，适当降低空塔气速、液气比及浆液浓度，优化喷淋工艺如增加喷淋层、合理布置脱硫喷嘴，能够有效抑制浆液夹带作用，进而降低脱硫净烟气中细颗粒物的排放浓度。

Abstract

Slurry droplets containing fine particles are entrained out of the scrubber in the process of the limestone-gypsum desulphurization

leading to significant impacts on the fine particle emission characteristics. The slurry atomization

entrainment characteristics of desulfurization slurry

and the relationship between fine particle emission and desulfurization slurry characteristics were on-line measured with the Phase Doppler Analyzer (PDA) system and the electrical low pressure impactor (ELPI+). The results show that large numbers of fine droplets and submicron solid particles exist in the flue gas after desulfurization

which attributes to the slurry entrainment during the desulfurization process. The emitted droplet sizes are related to the slurry atomization characteristics. They are mainly less than 20 μm and the solid content ratio of the emitted droplets and the slurry ranges from 20% to 40%. The operating parameters have significant effects on the amount of entrained slurry droplets such as the superficial gas velocity

the liquid gas ratio and the slurry concentration. With the decrease of these operating parameters and the spray optimization such as the increase of spray layers and the proper arrangement of the nozzles

the slurry entrainment is inhibited

resulting in the reduction of fine particle emissions.

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