Abstract
SummaryAiming at the problems that the existing coal spontaneous combustion physical inhibitor has the disadvantages of short retarding time and low blocking efficiency, the novel super‐absorbent polymer‐grafted tea polyphenol composite inhibitor is prepared based on analyzing the advantages and disadvantages of various kinds of inhibitors. The orthogonal test was carried out with the water‐absorbent as the assessment index, and the optimum formulation of the composite inhibitor was obtained: the degree of neutralization was 90%, the amount of initiator was KPS (Potassium peroxydisulfate)/AA (Acroleic acid) = 1.2%, and the amount of cross‐linking agent was MBA (N,N' Methylene diene amide)/AA = 0.4%. The experimental results show that the temperature of the cross‐point of the coal sample treated by obtained composite inhibitor increased by 18°C compared with the raw coal, and the crossing point temperature delayed by 37 minutes, the activation energy increased by 38.552 kJ/mol. The further mechanism analysis shows that the inhibitor has good water‐retaining and water‐absorbing property. The function of cooling by absorbing heat, covering coal and insulating oxygen, and also inhibiting the oxidation activity of the coal molecule can effectively inhibit the spontaneous combustion of the coal.
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