Citation: LIU Tian-yu, WEN Chang, SHAO Yu-hao, LIU En-ze, PAN Zu-ming, CHEN Sheng, XU Ming-hou. Effects of multiple agglomeration technology on the removal of particulate matters and particulate heavy metals: A pilot study[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(11): 1378-1385. shu

Effects of multiple agglomeration technology on the removal of particulate matters and particulate heavy metals: A pilot study

1.
School of Energy and Power Engineering, State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Wuhan Likang Energy Co. Ltd., Wuhan 430074, China

Corresponding author: WEN Chang, wenchang@hust.edu.cn
Received Date: 21 September 2020
Revised Date: 13 October 2020

Fund Project: Major Project of Technical Innovation of Hubei Province 2017ACA087The project was supported by the National Key R & D Program of China (2018YFB0605104) and Major Project of Technical Innovation of Hubei Province (2017ACA087)the National Key R & D Program of China 2018YFB0605104

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The emmision of particulate matters and heavy metals such as As, Se and Pb from coal combustion into the atmosphere would cause a serious environmental and human health hazard. Therefore, a multiple agglomeration based on the principle of turbulent coalescence and wall surface adsorption was developed to investigate the agglomeration effects on the removal of particulate matter and particulate heavy metals. Firstly, a numerical simulation method was adopted to comprehensively study the pressure loss, the velocity uniformity and the particle agglomeration effect, and a folded blade was selected for the multiple agglomeration device. Subsequently, a pilot study at a coal-fired plant on the particle agglomeration at different flue gas velocities was carried out. It is found that the agglomeration rate of PM₁ in the multiple agglomeration device is up to 32.84%. As the gas velocity is increased from 11.1 to 17.6 m/s, the agglomeration rate of PM_2.5 shows a certain decline, indicating that an increase in gas velocity would lead to a shorter residence time of particles and thus a decrease in agglomeration rate of particles. By comparing the concentration changes of As, Se and Pb in the particles before and after agglomeration, it is found that the agglomeration process can enhance the adsorption to gaseous heavy metals and also aggregate the nano-particles rich in heavy metals, thus resulting in an increase in the concentration of heavy metals in PM₁. The decrease of the absolute concentrations of As, Se and Pb in PM₁ after coalescence shows a cooperative removal effect in the multiple agglomeration device on the particulate matter and particulate heavy metals.
- multiple agglomeration,
- particulate matter,
- emission reduction,
- particulate heavy metal,
- flue gas velocity
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沈阳化工大学材料科学与工程学院沈阳 110142