Improvement of SO3 Sampling Technology and SO3 Removal Capability Testing of Flue Gas Treatment Equipment

doi:10.11930/j.issn.1004-9649.201706037

Abstract

Abstract: Due to its unique chemical properties, SO₃ in coal-fired flue gas has been one of the difficult parts in pollutant testing in coal-fired power plants both at home and abroad. In this article, the SO₃ testing system is developed by utilizing the widely used control-condensation method and taking various factors into consideration during the sampling process. The optimal inner diameter, ring diameter and the number of rings of snake-shaped tube in SO₃ controlled condensation sampling system are determined through experimental simulation as well as the sampling tubes, the temperature control of filter and circulating water bath to improve the capture efficiency of SO₃. This SO₃ sampling system has been used to test the removal capability of the flue gas treatment equipment in the coal-fired boiler. The influencing factors and the trapping mechanism on SO₃ by sampling the flue gas are also analyzed. It is showed that SCR catalyst had some catalytic effects on SO₂, and the conversion rate of SO₂/SO₃ increases with higher flue gas temperature. As for the removal efficiency of SO₃, based on the comparison results of the inlet and outlet concentration between each equipment, the dry dedusting equipment can reach more than 80%, while the wet desulphurization equipment is 35%~40% and the wet electrostatic precipitator is 70%~75%.

Key words: coal-fired power plants, flue gas sampling, SO₃, controlled condensation method, SO₂/SO₃ percent conversion, flue gas treatment equipment, SO₃ removal ability

CLC Number:

X701.3

YANG Ding, CHEN Yongqiang, CHEN Weixiang, ZHENG Fang, LIN Qichao. Improvement of SO₃ Sampling Technology and SO₃ Removal Capability Testing of Flue Gas Treatment Equipment[J]. Electric Power, 2018, 51(7): 157-161.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201706037

https://www.electricpower.com.cn/EN/Y2018/V51/I7/157

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Improvement of SO₃ Sampling Technology and SO₃ Removal Capability Testing of Flue Gas Treatment Equipment

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