Formation and emission characteristics of PM<sub>2.5</sub> in a 660 MW coal-fired unit

PAN Siwei; ZHANG Kai; ZHANG Yu; XU Yishu; LIU Xiaowei; XU Minghou

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Formation and emission characteristics of PM_2.5 in a 660 MW coal-fired unit

更新时间：2025-09-28

- Formation and emission characteristics of PM_2.5 in a 660 MW coal-fired unit
- Thermal Power Generation Vol. 45, Issue 10, Pages: 29-34(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, ZHANG Kai, ZHANG Yu, et al. Formation and emission characteristics of PM_2.5 in a 660 MW coal-fired unit[J]. Thermal power generation, 2016, 45(10): 29-34.
DOI：

PAN Siwei, ZHANG Kai, ZHANG Yu, et al. Formation and emission characteristics of PM_2.5 in a 660 MW coal-fired unit[J]. Thermal power generation, 2016, 45(10): 29-34. DOI：

摘要

对某660 MW机组燃煤锅炉静电除尘器(ESP)前、后颗粒物和湿法石灰石-石膏脱硫装置(WFGD)后颗粒物分别进行了现场取样分析

研究了燃用2种煤时机组的PM_(2.5)生成特性

并分析了ESP及WFGD对PM_(2.5)粒径颗粒等不同排放特性的影响。结果表明:该锅炉燃用2种煤产生的细颗粒物PM_(2.5)均呈双模态分布

且PM_(2.5)与PM_(10)生成量与煤的灰分含量呈正相关关系;ESP对PM_(10)、PM_(2.5)和PM_(1.0)的脱除效率分别为99.812%、99.711%和99.402%

对粒径0.1~1.0μm颗粒物的脱除效率低于其他粒径颗粒物;烟气经过装有气-气换热器(GGH)的WFGD后

粒径在1.0μm以上的颗粒物质量浓度下降约40%

而粒径1.0μm的颗粒物质量浓度升高约35%;脱硫浆液喷淋对颗粒物的洗涤作用会降低粒径1.0μm的颗粒物质量浓度;而超细颗粒物的团聚长大及脱硫浆液携带产生的石膏颗粒等则会导致1.0μm的颗粒物质量浓度有所升高。

Abstract

Particulate matter(PM)samplings were performed on a 660 MW coal-fired unit

at the inlet and outlet of electrostatic precipitator(ESP)

and the outlet of limestone-gypsum wet flue gas desulfurization(WFGD)tower

to study the formation characteristics of PM_(2.5) when firing different types of coal.The influences of the ESP and WFGD on emission characteristics of PM_(2.5) were investigated.A low pressure impactor(LPI)was applied to collect the PMs with different sizes

and the particle size distribution(PSD)and concentration of PMs were obtained via calculation.The results show that

the PMs produced from the combustion of the two tested coals are of bimodal size distribution.However

the PM yield differs from each other due to the different ash contents in coal.The ESP has a removal efficiency of 99.812%

99.711% and 99.402% for PM_(10)

PM_(2.5)and PM_(1.0)

respectively

with the lowest removal efficiency for PMs in the size range from 0.1μm to 1μm.When the flue gas passes through the WFGD tower and gasgas heater(GGH)

the concentration of PMs with size below 1.0μm increases by about 35%

but the concentration of PMs with size larger than 1.0μm reduces by 40%.Captured by the sprayed desulfurizationslurry helps the concentration of PMs with size larger than 1.0μm be reduced

while the coagulation of ultrafine PMs and the gypsum slurry entrainment will cause an increase in concentration of the PMs with size less than 1.0μm.

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Formation and emission characteristics of PM2.5 in a 660 MW coal-fired unit

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摘要

Abstract

关键词

Keywords

references

Formation and emission characteristics of PM_2.5 in a 660 MW coal-fired unit