Effect of External Mineral Addition on PM Generated from Zhundong Coal Combustion

Shizhang Wang, Junjie Wang, Yu Zhang (), Linhan Dong, Heming Dong, Qian Du and Jianmin Gao
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Shizhang Wang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Junjie Wang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Yu Zhang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Linhan Dong: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Heming Dong: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Qian Du: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Jianmin Gao: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2023, vol. 16, issue 2, 1-24

Abstract: The effect of intrinsic metal mineral elements in the combustion process of pulverized coal on the formation and transformation mechanism of PM was investigated in a drop-tube furnace in air atmospheres at 1200 °C, which laid a solid foundation for the control of particulate pollutants. The results show that reducing the evaporation of mineral elements or the generated PM 1 aggregating to form PM 1–10 or particles bigger than 10µm can reduce the emission of PM 1 in the coal combustion process. The amount of PM 0.2 , PM 0.2–1 , PM 1–2.5 and PM 2.5 produced by the raw coal-carrying Mg are reduced by 36.7%, 17.4%, 24.6% and 21.6%, respectively. The amount of PM 10 is almost unchanged. The addition of Mg increases the viscosity of submicron particles effectively, making it easier to aggregate and bond together to form ultra-micron particles. The amount of PM 0.2 , PM 0.2–1 , PM 1–2.5 , PM 2.5 and PM 10 produced by the raw coal-carrying Ca are reduced by 36.3%, 33.0%, 42.8%, 38% and 17.7%, respectively. The effect of adding Ca compounds on the particles is better than that of Mg. The amount of PM 0.2 , PM 0.2–1 , PM 1–2.5 , PM 2.5 and PM 10 produced by the raw coal-carrying Fe are reduced by 15.6%, 16.2%, 31.1%, 22.4% and 5%, respectively. While the production of PM 2.5–10 increased from 0.17 mg/g to 0.34 mg/g, it is clear that a significant fraction of the submicron particles produced during the combustion of the raw coal-carrying Fe are transformed into ultra-micron particles. After comparing the particulate matter produced by raw coal-carrying Mg, Ca and Fe, it shows that the addition of these three elements can effectively reduce the ash melting point, so that during the process of coal combustion, part of the sub-micron are transformed into ultra-micron particles, which are easy to remove.

Keywords: external mineral addition; PM; coal; combustion; Mg; Ca; Fe (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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