Forced ignition and subsequent combustion of large coal particles in a cold air and oxygen are investigated experimentally. The critical value of the initial temperature (ignition temperature) of a particle of charcoal and of anthracite is estimated. On preliminary heating of the particle above the ignition temperature, a quasi-stationary mode of combustion is attained after a certain interval of time. For a charcoal particle, depending on the initial density of the particle, either a substantial change in its density or its invariability in the process of combustion in a cold air flow is observed. A relation is suggested allowing one to estimate the critical temperatures of ignition in cold gaseous mixtures depending on oxygen concentration and particle diameter. The absence of ignition of a large anthracite particle in air at room temperature is attributed to the larger value of the activation energy there than in the charcoal particle.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 94, No. 2, pp. 372–379, March–April, 2021.
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Chernenko, A.S., Kalinchak, V.V. Ignition and Combustion of Large Coal Particles in Cold Nitrogen–Oxygen Mixtures. J Eng Phys Thermophy 94, 357–364 (2021). https://doi.org/10.1007/s10891-021-02305-w
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DOI: https://doi.org/10.1007/s10891-021-02305-w