Experimental Study on the Law Prevention of Coal Spontaneous Combustion by Shielding O₂ With Hysteresis Oxygen Depletion Inhibitor

ABSTRACT

To improve the efficiency of flame retardants in preventing spontaneous combustion of coal, a new type of hysteresis oxygen depletion inhibitor was developed based on the principle of bionics using sodium alginate, NaHCO₃, MgCl₂, and reduced Fe powder as raw materials. Oxygen permeation rates of different concentrations of sodium alginate were investigated by oxygen permeation experiments, the oxygen consumption characteristics of the inhibitor were analyzed according to the oxygen consumption experiments, and the inhibitory effect of the inhibitor on the oxidative process of spontaneous combustion of coal was analyzed according to the coal oxidative procedure warming experiments. The results showed that oxygen penetration into the inhibitor was slowest when the concentration of sodium alginate was 2%; 1.11 mg/L Fe reduction powder was low exothermic and could continuously consume oxygen; After the addition of this inhibitor, the temperature point where coal samples consumed a lot of oxygen was delayed from 130°C to 170°C, the oxygen consumption rate was reduced from 16.56% to 5.36%, and the inhibition rate of coal oxidation was as high as 67.63%-98.20%. This study used deoxygenation to reduce the coal oxygen contact and provides new ideas and methods for effectively curbing the spontaneous combustion of coal.

KEYWORDS:

• Coal spontaneous combustion
• multi-angle
• shielded oxygen
• hysteresis
• inhibitor

Acknowledgements

The authors deeply appreciate the financial supports provided by Applied Basic Research Project of Shanxi Province, China (No. 20210302123108).

Disclosure statement

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

Credit authorship contribution statement

Zhen Wang: Methodology, Investigation, Writing – original draft, Data curation. Chaoyu Hao: Software, Conceptualization, Supervision, Funding acquisition. Le Li: Visualization, Writing – review & editing. Wenhao He: Validation. Cunbao Deng: Resources.

Additional information

Funding

The work was supported by the Applied Basic Research Project of Shanxi Province, China [No. 20210302123108].