Citation: LIU Jing-chao, ZHAO Yong-chun, HE Yong-lai, JI Yu-shan, CUI Xiang-zheng, XIAO Ri-hong, ZHANG Jun-ying, ZHENG Chu-guang. Experimental research on the control of heavy metal emissions from 330 MW coal-fired unit by heterogeneous agglomeration[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(11): 1386-1393. shu

Experimental research on the control of heavy metal emissions from 330 MW coal-fired unit by heterogeneous agglomeration

1.
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
2.
China-EU Institute of Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, China
3.
State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116000, China

Corresponding author: ZHAO Yong-chun, yczhao@hust.edu.cn
Received Date: 10 September 2020
Revised Date: 8 October 2020

Fund Project: National Key Research and Development Program 2018YFB0605104Hubei Province Key Research and Development Program 2020BCA076The project was supported by National Key Research and Development Program (2018YFB0605104) and Hubei Province Key Research and Development Program (2020BCA076) Project

Figures(11)

In order to investigate the influence of spraying the agglomeration adsorbent on the removal efficiency of fine particles and heavy metals, the sampling and tests on particles and heavy metals were carried out before and after the dedusters and the desulfurization towers in the Unit 1 of a power plant in Hubei Province with a capacity of 330 MW and equipped with a double-chamber four-electric-field electrostatic precipitator. The test results show that after spraying the agglomeration adsorbent in the flue, the proportion of the particulate heavy metals at the ESP inlet increases, the Se element increasing significantly in PM_2.5 and PM₁₀, while the heavy metal content in the gas phase decreases, indicating that the agglomeration adsorbent can improve the coagulation efficiency of particulate heavy metals, leading to the small particulate and heavy metals in gas phase being transferred to large particulates. In gypsum, the content of heavy metals is significantly reduced after agglomeration, indicating that heavy metals can join the desulfurized gypsum. Also, the heterogeneous agglomeration enhances the effect of ESP on the removal of heavy metals. At the point before final discharge to the chimney, there is a significant decrease in the content of heavy metals compared with the non-agglomerated condition, which indicates that the heavy metals discharged into the atmosphere after agglomeration are significantly reduced, and the heterogeneous agglomeration plays a key role in the control of heavy metals.
- heterogeneous agglomeration,
- particle,
- heavy metals,
- arsenic,
- selenium,
- lead
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