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Effect of inhibitors on the thermodynamics and kinetics of spontaneous combustion of coal

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Abstract

In order to find a low-cost and better performance inhibitor, this study chose the widely used and effective inhibitors NH4HCO3, ammonium polyphosphate (APP) and waterborne polyacrylate (PA) and designed the TG–DSC and FTIR experiments of coal samples with three kinds of inhibitors to study the effects of different inhibitors on various parameters of spontaneous combustion of coal. The results showed that the mass loss rate of C&APP and C&PA was lower than that of raw coal, and the enthalpy and oxygen absorption quantity of coal obviously reduced, and the content of gas products also reduced to some extent. The two kinds of inhibitors had good retardant effect, but it was not good for C&NH4HCO3. Through the curve-fitting analysis of infrared spectrums, the intrinsic mechanism of retardant effect of PA was studied in depth, and it was found that PA can reduce the decomposition of aliphatic structure and inhibit the formation of oxygen-containing functional groups of coal. Further kinetic analysis was carried out by using the isoconversional method. It is found that adding PA increases activation energy in the oxygen absorption and mass gain stage of coal, which have retardant effect in the primary stage of spontaneous combustion of coal.

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Acknowledgements

This study is supported by National Key Research and Development Program of China (No:2016YFC0801800) and National Nature Science Foundation of China (No: 51774291 and 51864045).

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Authors and Affiliations

  1. School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Bo Tan, Hongyi Wei, Feichao Zhang, Bin Xu & Kunliang Chen

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  1. Bo Tan
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  2. Hongyi Wei
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  3. Feichao Zhang
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Correspondence to Bo Tan.

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Tan, B., Wei, H., Zhang, F. et al. Effect of inhibitors on the thermodynamics and kinetics of spontaneous combustion of coal. J Therm Anal Calorim 140, 295–307 (2020). https://doi.org/10.1007/s10973-019-08771-y

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  • DOI: https://doi.org/10.1007/s10973-019-08771-y

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