燃煤烟气中SO3迁移转化特性及其控制的研究现状及展望

doi:10.16085/j.issn.1000-6613.2017-2486

摘要/Abstract

摘要： SO₃排放导致的烟羽浊度增大、蓝烟/黄烟现象及其排入大气环境后转化为二次气溶胶等问题，已引起广泛关注。燃煤电厂SO₃的排放主要由煤燃烧以及SCR烟气脱硝中SO₂氧化形成，随着选择性催化还原（SCR）脱硝设施的推广应用及高硫煤使用量的增多，控制燃煤SO₃排放已迫在眉睫。本文分析综述了燃煤烟气SO₃在SCR脱硝过程、低低温电除尘、湿法烟气脱硫以及湿式电除尘中的生成、迁移转化及脱除特性。同时介绍了两类控制燃煤烟气系统中SO₃的技术，一是利用现有污染物控制设备的协同作用；二是喷射碱性吸收剂吸收SO₃，综合比较了各类碱性吸收剂以及不同喷射位置，提出一种将喷碱性吸收剂与脱硫废水烟道蒸发技术相结合的控制方法。最后指出探究烟气系统中SO₃迁移转化特性以及碱性吸附剂脱除SO₃的反应机理及其影响因素是未来燃煤烟气SO₃控制技术研究的发展方向。

关键词: 三氧化硫(SO₃), 燃煤烟气, 迁移, 转化, 控制

Abstract: The increased plume turbidity, the phenomenon of blue/yellow smoke and the conversion into secondary aerosol after its entry into the atmosphere caused by SO₃ emission have aroused increasing attention. The emission of SO₃ in coal-fired power plant mainly consists of coal combustion and SO₂ oxidation in selective catalytic reduction (SCR). With the increasing application of SCR and the use of high sulfur coal, the control of SO₃ emission from coal-fired is imminent. This paper reviewed the migration, transformation and removal of SO₃ in SCR, low-low temperature electrostatic precipitator, wet flue gas desulfurization and wet electrostatic precipitator. At the same time, this paper expounds two kinds of SO₃ control technologies in flue gas of coal-fired power plant, one is to take advantage of the synergistic effects of existing pollutant control devices, and the other is to absorb SO₃ through the injection of alkaline absorbent. The different types of alkaline absorbent and the injection position were compared. A control method combining alkaline absorbent spray with desulfurization wastewater evaporation treatment in flue gas duct was put forward. It is pointed out that exploring the characteristics of SO₃ migration and transformation in flue gas system, as well as the reaction mechanism of alkaline adsorbent for removing SO₃ and its influencing factors are the developing directions on the research of SO₃ control technology in coal-fired flue gas.

Key words: sulfur trioxide, coal-flue gas, migration, transformation, control

中图分类号:

X701.7

李欣怡, 潘丹萍, 胡斌, 程滕, 杨林军. 燃煤烟气中SO₃迁移转化特性及其控制的研究现状及展望[J]. 化工进展, 2018, 37(12): 4887-4896.

LI Xinyi, PAN Danping, HU Bin, CHENG Teng, YANG Linjun. Research status and prospects of migration, transformation and control of SO₃ from coal-fired flue gas[J]. Chemical Industry and Engineering Progress, 2018, 37(12): 4887-4896.

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燃煤烟气中SO₃迁移转化特性及其控制的研究现状及展望

Research status and prospects of migration, transformation and control of SO₃ from coal-fired flue gas

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