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Citation: HU Shi-hao, ZHANG Jia-kai, CEN Ke-fa, ZHOU Hao. Ash deposition characteristics during co-combustion of coal and sawdust[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(9): 1055-1062. shu

Ash deposition characteristics during co-combustion of coal and sawdust

  • Zhejiang University, Institute for Thermal Power Engineering, State Key Laboratory of Clean Energy Utilization, Hangzhou 310027, China

  • Corresponding author: ZHOU Hao, zhouhao@zju.edu.cn
  • Received Date: 21 May 2020
    Revised Date: 15 July 2020

    Fund Project: The project was supported by the National Science Fund for Distinguished Young Scholars(51825605)The project was supported by the National Science Fund for Distinguished Young Scholars 51825605

Figures(8)

  • The ash deposition characteristics during co-combustion of coal and sawdust was studied in a 50 kW furnace with an online monitoring system composed of CCD camera and ash deposition probe. The deposition process can be divided into three stages: slow growth stage, rapid and stable stage. The stable thickness of bituminous coal increases with increasing proportion of sawdust, while that of lean coal is opposite. The stable thickness of bituminous coal are 1.37, 3.85, 11.50, 20.56 mm and the stable relative heat flux are 0.44, 0.41, 0.30, 0.26 when blending ratio of sawdust are 0, 6.7%, 15%, 22% respectively. The stable slags thickness of lean coal are 18.65, 10.97, 9.78 mm and the stable relative heat flux densities are 0.29, 0.31, 0.33 when blending ratio of sawdust are 6.7%, 15% and 22%. Ca and K in the initial layer of deposition significantly increases in the co-combustion. The melting fraction calculated by FactSage software shows that at the same tem-perature, the melting fraction of ash increases as the sawdust is increased. Because the wood ash contains more alkali metal oxides such as Na2O and K2O, while the content of Al2O3 and SiO2 is less, which lowers the melting temperature of ash.
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