Study on the Effect of the Obstacle on Heat Transfer Oxidation Spontaneous Combustion Characteristic of Coal Gangue Fracture

ABSTRACT

To address the coal gangue fracture heat transfer problem, the law of heat transfers and temperature distribution in the coal gangue fracture is studied. The temperature distribution in a coal gangue fracture under 12 conditions (with or without the obstacle, and various heat flows) is simulated via Fluent numerical simulation. The results show that the heat flow velocity, temperature and obstacle are important factors in inhibiting heat transfer oxidation spontaneous combustion in the coal gangue fracture. When the heat flow temperature is constant, the low-velocity heat flow causes a large temperature drops in the coal gangue fracture; when the heat flow velocity is constant, the high-temperature heat flow also produces a large temperature drops effect; when the obstacle is present and the heat flow produces vortex pass through the obstacle, increasing the energy loss in the coal gangue fracture, causing the temperature in the coal gangue fracture to drop rapidly, and reach the lowest in the position of the obstacle. Obstacles can effectively inhibit the heat transfer characteristics in the coal gangue fracture and reduce the risks of oxidation spontaneous combustion of gangue after grouting.

KEYWORDS:

• Oxidation spontaneous combustion
• coal gangue fracture
• obstacle
• heat flow
• heat transfer

Acknowledgments

This work was carried out with funding from the National Natural Science Foundation of China (Grant No. 51304070, 51674103), Training Program for Young Backbone Teachers in Henan Higher Education Institutions (Grant No. 2018GGJS056), Outstanding Youth Fund of Henan Polytechnic University (Grant No. J2018-5), and supported by the Science Research Funds for the Universities of Henan Province. The authors wish to thank these organizations for their support. They also wish to thank the readers and editors for their constructive comments and suggestions to improve the manuscript.

Additional information

Funding

This work was supported by the Outstanding Youth Fund of Henan Polytechnic University [Grant No.J2018-5]; National Natural Science Foundation of China [Grant No. 51304070, 51674103]; Training Program for Young Backbone Teachers in Henan Higher Education Institutions [Grant No. 2018GGJS056].