Study on Environmental Benefits of Wet Plume Treatment Project Based on Actual Measurements

doi:10.11930/j.issn.1004-9649.202004038

Abstract

Abstract: In order to evaluate the environmental benefits, onsite measurements were retrieved by using the RJ-SO₃-M portable SO₃ analyzer in the wet plume treatment project of a 600 MW power unit in Handan, Hebei Province. The monitoring data of dust, SO₂ and NO_x before and after the wet plume treatment project were continuously collected under the conditions of similar operating load, coal quality and time period of operations. The results show that the flue gas cooling has very limited effects on the removal of SO₃ by FGD and WESP. In addition, there is no correlation between flue gas temperature drop and SO₃ removal efficiency of FGD, WESP and FGD + WESP. The total removal efficiency of SO₃ by FGD + WESP is between 75.6% and 81.9%, with the average of 78.9% under the conditions of the temperature drop by 0 ℃, 2.9 ℃, 3.9 ℃ and 5.8 ℃ respectively. The temperature drop of flue gas in the wet plume treatment project is beneficial to the removal of particulate matter by WESP. For instance, the mass concentration of dust emission has decreased by 0.5 mg/m³, while the concentration of SO₂ and NO_x emission remains almost unchanged. The removal of SO₃ in flue gas mainly depends on FGD and WESP, but has almost nothing to do with whether the flue gas has been cooled down. Therefore cooling down the flue gas temperatures turns out not an effective way to reduce the emission of pollutants.

Key words: wet plume treatment project, temperature drop, SO₃, conventional pollutants

ZHANG Zhiqiang, ZHU Fahua, ZOU Siyi, SHI Pengfei, WANG Xiaoling, YOU Qin, YAO Li, YAN Shaoshuai, WANG Xing. Study on Environmental Benefits of Wet Plume Treatment Project Based on Actual Measurements[J]. Electric Power, 2020, 53(9): 202-207.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202004038

https://www.electricpower.com.cn/EN/Y2020/V53/I9/202

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