LIU Dong, HU Letian. Experimental study on effects of imidazolium-based ionic liquids on heat transfer characteristics of coal[J]. Safety in Coal Mines, 2022, 53(6): 44-49.
    Citation: LIU Dong, HU Letian. Experimental study on effects of imidazolium-based ionic liquids on heat transfer characteristics of coal[J]. Safety in Coal Mines, 2022, 53(6): 44-49.

    Experimental study on effects of imidazolium-based ionic liquids on heat transfer characteristics of coal

    • To investigate the influence of imidazolium-based ionic liquids(ILs) on the heat transfer characteristics of coal, the gas-fat coal from Ewirgol Coal Mine was selected, and BMIMBF4, BMIMNO3, BMIMI, BMIMPF6 and BMIMNTf2 were adopted to treat coal. The laser heat conduction experiment was conducted to measure the thermal diffusivity, specific heat capacity, and thermal conductivity for ILs treated coal and untreated coal at 30–300 ℃ under air atmosphere, and the influence of ILs on thermophysical parameters of coal was obtained. Results indicated that: with elevated temperature, the thermal diffusivity of ILs treated coal and untreated coal decreased and then increased, the specific heat capacity rose and then tended to be steady, and the thermal conductivity enhanced slowly and then increased rapidly. In fixed temperature, the thermal diffusivity and thermal conductivity of ILs treated coal were lower than that of untreated coal, but specific heat capacity was higher than that of untreated coal. Meanwhile, the thermal diffusivity and thermal conductivity of BMIMBF4 treated coal decreased by 12.9% and 7.3%, respectively, and specific heat capacity increased by 9.0%, which was higher than the effect of other ILs on thermophysical parameters of coal. BMIMBF4 had obvious inhibition effect on heat transfer characteristics of coal.
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