Determining the Spontaneous Combustion Period and Limit Parameters of Coal: A Large-Scale Furnace Experiment

ABSTRACT

A large-scale experiment on coal spontaneous combustion (CSC) was conducted to investigate the experimental spontaneous combustion period (ESCP) and limit parameters. Coal samples were collected from the Wenjiapo coal mine in the Binchang mining area in Shaanxi Province, China. Specifically, the high-temperature point (HTP) migration of coal and the variations in the oxygen consumption rate, heat release intensity, lower limit oxygen concentration (LOC), maximum air leakage intensity (ALI), and minimum residual coal thickness (RCT) during CSC were investigated. The ESCP was discovered to be 35 days. During CSC, the HTP moved from the middle of the coal body to the bottom where air was supplied. Heat release intensity and oxygen consumption rate were directly proportional to coal temperature. Under the same conditions, minimum RCT increased with ALI, lower LOC decreased as RCT increased, and maximum ALI increased with RCT.

KEYWORDS:

• Oxygen consumption rate
• heat release intensity
• limit oxygen concentration
• air leakage intensity
• residual coal thickness

Nomenclature

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Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [Grant No.51974233].