Analysis on Coordinated Reduction of SO3 in Whole Process of Ultra-low Emission in Coal-Fired Flue Gas

doi:10.11930/j.issn.1004-9649.201704063

Abstract

Abstract: It is necessary to study the formation, concentration, emission level and influencing factors of the sulfur trioxide in the control process of flue gas pollutants in thermal power plants because the sulfur trioxide in the flue gas is one of the precursors of smog. Based on the onsite measurements of ultra-low emission facilities of 300~1 000 MW coal-fired units and the whole process test of a 1 000 MW unit, the comparison with the conventional pollutant control process shows that the ultra-low emission facilities have a better control effect on SO₃ with SO₃ comprehensive removal efficiency reaching 90%. The SO₃ removal mechanism and effect of each equipment in flue gas flow process were also analyzed. The results show that: (1) SCR denitrification device has a catalytic oxidation effect on SO₂ converted to SO₃. (2) The air preheater consumes SO₃ indirectly during the process of the flue gas temperature drop. The low-low temperature electrostatic precipitator, the wet desulfurization absorber and the wet electrostatic precipitator all contribute to the SO₃ reduction, accounting for 30%, 40%, 15% and 5% of total reduction respectively. (3) The air preheater, electrostatic precipitator operating temperature has great impacts on SO₃ removal rate. (4) The high-efficiency desulfurization synergistic dust removing integrated absorption tower has a better effect of SO₃ removal.

Key words: coal-fired units, flue gas pollutants, ultra-low emission, sulfur trioxide, SCR denitrification equipment, air preheater, low-low temperature electrostatic precipitator, wet desulfurization, wet electrostatic precipitator

CLC Number:

X511
TM621

TAO Leixing, WENG Jie, LI Xiaofeng, YUE Chunmei, WANG Jian, AI Chunmei, DONG Feiying. Analysis on Coordinated Reduction of SO₃ in Whole Process of Ultra-low Emission in Coal-Fired Flue Gas[J]. Electric Power, 2018, 51(3): 177-184.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201704063

https://www.electricpower.com.cn/EN/Y2018/V51/I3/177

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Analysis on Coordinated Reduction of SO₃ in Whole Process of Ultra-low Emission in Coal-Fired Flue Gas

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