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

Lizheng Zhao, Yanfei Du, Yusen Zeng, Zhizhong Kang and Baomin Sun
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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

Energies, 2020, vol. 13, issue 3, 1-19

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.

Keywords: circulating fluidized bed (CFB); coal and gangue co-combustion; sulfur fixation; sulfur compounds (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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