超低排放燃煤电厂中SO3的迁移及脱除特征

doi:10.16085/j.issn.1000-6613.2020-0186

摘要/Abstract

摘要：

燃煤烟气中的SO₃会对机组运行及大气环境造成不利影响。为研究燃煤电厂SO₃排放特征，本文采取异丙醇吸收法对某300MW超低排放机组污染物控制装置进出口SO₃采样，以分析SO₃在燃煤机组中的迁移及脱除特性。结果表明：炉膛燃烧过程以及选择性催化还原装置（selective catalytic reduction，SCR）均将部分SO₂转化为SO₃，炉膛燃烧生成SO₃的质量浓度为SO₂的0.86%，SCR内SO₂/SO₃转化率为0.45%。烟气经过空气预热器，SO₃浓度降低了5.7%；静电除尘器（electrostatic precipitator，ESP）脱除SO₃效果较差，主要由于ESP内烟温在110℃以上，H₂SO₄酸雾凝结量较少；双级湿法脱硫装置（wet flue gas desulfurization，WFGD）对SO₃脱除效率达到81.3%，比国内单级脱硫装置SO₃脱除效果高30%～50%；湿式静电除尘器（wet electrostatic precipitator，WESP）脱除SO₃效率为23.0%。机组烟囱排放SO₃质量浓度为2.025mg/m³（标准），SO₃排放因子EF为0.034kg/t。

关键词: 燃煤机组, 三氧化硫, 超低排放, 脱除特性, 排放因子

Abstract:

SO₃ in coal-fired flue gas could cause negative effects on the operation of power plants and the atmospheric environment. To further understand the SO₃ emission from coal-fired power plants, SO₃ was sampled by isopropanol absorption method at the inlet and outlet of each air pollution control device of a 300MW ultra-low emission unit. The migration and removal characteristics of SO₃was analyzed. The results showed that both of combustion process and selective catalytic reduction (SCR) could converted SO₂ into SO₃. The mass concentration of SO₃ generated in the combustion process accounted for 0.86% of SO₂ and the conversion rate of SO₂/SO₃ in SCR was 0.45%. The SO₃ concentration was reduced by 5.7% with an air preheater. The removal efficiency of SO₃ by electrostatic precipitator (ESP) was not satisfactory because the temperature of the flue gas in ESP was above 110℃, which resulted in a less condensation amount of H₂SO₄ acid mist. The removal efficiency of SO₃ by the two-stage desulfurization tower was 81.3%, which was 30%—50% higher than that of single stage desulfurization tower. The SO₃ removal efficiency by wet electrostatic precipitator (WESP) was 23%. The SO₃ emission mass concentration of coal-fired power plant was 2.025mg/m³ with an emission factor EF_coal of 0.034kg/t.

Key words: coal-fired power plant, sulfur trioxide, ultra-low emission, removal characteristics, emission factor

中图分类号:

X701

冯鹏, 李正鸿, 刘鹤欣, 谭厚章, 张思聪, 卢旭超, 杨富鑫. 超低排放燃煤电厂中SO₃的迁移及脱除特征[J]. 化工进展, 2020, 39(11): 4660-4667.

Peng FENG, Zhenghong LI, Hexin LIU, Houzhang TAN, Sicong ZHANG, Xuchao LU, Fuxin YANG. Migration and removal characteristics of SO₃ in ultra-low emission coal-fired power plant[J]. Chemical Industry and Engineering Progress, 2020, 39(11): 4660-4667.

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超低排放燃煤电厂中SO₃的迁移及脱除特征

Migration and removal characteristics of SO₃ in ultra-low emission coal-fired power plant

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