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Research Article

Laboratory Investigation of Underground Fire Hazard Control in Coal Mines by Use of the Pyrotechnic Aerosol

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Pages 232-246 | Received 13 Oct 2020, Accepted 20 Jun 2021, Published online: 12 Jul 2021
 

ABSTRACT

To control underground fire hazards, the principle of a pyrotechnic aerosol was adopted in coal fire-extinguishing experiments. Results show that fire extinguishing efficiency of a pyrotechnic aerosol composed of 63.4% KNO3, 23.6% C2H4N4, 8% C7H6O2, and 2% C8H5KO4 is better than that of nitrogen at 0.25 MPa. The required time to fire extinction is reduced by 41.6% in a 1 m3 control volume. TG/DTG tests support the view that the aerosol and its residues inhibit the oxidation and retards the combustion of coal. According to the EDS tests, the solid residues of the PA are mainly alkaline potassium salts such as K2CO3 and KHCO3. The FTIR results indicate that the K from the pyrotechnic aerosol will interact with the -OH in coal samples and also creates an alkaline environment inhibiting the production of -COOH. The effect on a pyrotechnic aerosol on coal fires is to produce ultra-fine and inert residue particles to extinguish the fire.

Disclosure statement

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

Additional information

Funding

This study is funded by the Project of National Natural Science Foundation of China (Grant no. 51604185).

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