Study on the Behavior of Sulphur Trioxide in the High-Sulphur Low-Temperature and High-Ash Flue Gas Environment

doi:10.11930/j.issn.1004-9649.201812024

Abstract

Abstract: A low-low temperature economizer test-bed is set up in a generation unit burning high-sulphur coal, and the SO₃ co-removal experiment is carried out in the high-sulfur, low-temperature and high-ash flue gas environment. The results show that the ratio of SO₃ to SO₂ concentrations is about 0.97%, and the SO₃ concentration at the outlet of the low-low temperature economizer drops significantly when the flue gas temperature falls into the range of 150~120℃. By contrast, when the temperature is below 120℃, no significant change of SO₃ concentration is seen with the temperature decrease, which can be kept below 15 mg/m³. While with the temperature of flue gas below 100℃, the SO₃ concentration is basically stabilized at about 10 mg/m³. Especially when the temperature of flue gas decreases to around 100℃, the removal rate of SO₃ is 84.3%~88.8%. Moreover, the measured SO₃ concentrations do not match well with calculated values from the formulas of acid dew point. When the temperature of flue gas is above 150℃, the measured data is apparently lower than the calculated value, while with the temperature below 115℃, the measured value is apparently higher than the calculated value. The change of SO₃ concentration in the low temperature flue gas of high sulphur coal is subject to the flue gas temperature and the fly ash. The empirical formula obtained through this experimental study can effectively forecast the SO₃ concentrations in flue gas.

Key words: coal-fired power plant, high-sulphur coal, SO₃, low-low temperature economizer, flue gas temperature, acid dew point

CLC Number:

TK314

ZHANG Zhixiang, LI Nan, ZOU Xiaogang, SU Lin, LI Wenfeng, LI Weitao, HAN Jianping, XU Dangqi. Study on the Behavior of Sulphur Trioxide in the High-Sulphur Low-Temperature and High-Ash Flue Gas Environment[J]. Electric Power, 2019, 52(3): 23-28.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201812024

https://www.electricpower.com.cn/EN/Y2019/V52/I3/23

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