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Sulfur Conversion of Mixed Coal and Gangue during Combustion in a CFB Boiler

Author

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  • Lizheng Zhao

    (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 02206, China)

  • Yanfei Du

    (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 02206, China)

  • Yusen Zeng

    (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 02206, China)

  • Zhizhong Kang

    (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 02206, China)

  • Baomin Sun

    (School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 02206, China)

Abstract

The construction of a power plant using a 660 MW e supercritical circulating fluidized bed (CFB) boiler with co-combustion of coal and gangue has been proposed in China. Therefore, this study simulated the distribution law and transformation mechanism of sulfur-containing phases using three low-calorific samples of gangue and coal mixtures under different conditions, based on the thermodynamic simulation software HSC Chemistry. The results showed that sulfur low in calorific value coal is mainly converted into gas phase SO 2 , solid phase alkali metal sulfate (Na 2 SO 4 and K 2 SO 4 ), and alkaline earth metal sulfate (CaSO 4 and MgSO 4 ) in an oxidizing atmosphere. Under a reductive atmosphere, sulfur in coal is mainly converted into gaseous H 2 S, COS (Carbon oxysulfide), and solid FeS x . With an increase in the O/C ratio, the distribution curve of sulfur-containing substances contracted to lower temperatures. It was established that the sulfur fixation capacity of coal ash depends on the relative amounts of basic oxides and sulfur present in it. Relevant conclusions were also verified and compared to those of the laboratory small-fluidized bed test bench and the 3 MW th CFB combustion test bench.

Suggested Citation

  • Lizheng Zhao & Yanfei Du & Yusen Zeng & Zhizhong Kang & Baomin Sun, 2020. "Sulfur Conversion of Mixed Coal and Gangue during Combustion in a CFB Boiler," Energies, MDPI, vol. 13(3), pages 1-19, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:553-:d:312445
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    References listed on IDEAS

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    1. Guan-Bang Chen & Samuel Chatelier & Hsien-Tsung Lin & Fang-Hsien Wu & Ta-Hui Lin, 2018. "A Study of Sewage Sludge Co-Combustion with Australian Black Coal and Shiitake Substrate," Energies, MDPI, vol. 11(12), pages 1-25, December.
    2. Liu, Dianbin & Li, Wei & Li, Shiyuan & Song, Wenhao & Liu, Daofeng & Kong, Runjuan, 2019. "Transformation characteristics of sodium, chlorine and sulfur of Zhundong coal during O2/CO2 combustion in circulating fluidized bed," Energy, Elsevier, vol. 185(C), pages 254-261.
    3. Liang, Xiaorui & Wang, Qinhui & Luo, Zhongyang & Eddings, Eric & Ring, Terry & Li, Simin & Lin, Junjie & Xue, Shuang & Han, Long & Xie, Guilin, 2019. "Experimental and numerical investigation on sulfur transformation in pressurized oxy-fuel combustion of pulverized coal," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
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    1. Xueshen Wang & Zheng Gan & Shengwei Xin & Chunzhen Yang, 2023. "Study on Gas–Solid Two–Phase Flow Characteristics of One–Furnace with Two–Tower Semi–Dry Desulfurization in Circulating Fluidized Bed Boiler," Energies, MDPI, vol. 16(4), pages 1-13, February.

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