Study on the influence of flow field on evolution law of temperature distribution in goaf

Abstract

Accurately grasping the distribution and evolution law of coal spontaneous combustion temperature in goaf is a prerequisite for improving the prevention and control effect of coal spontaneous combustion. Taking the 15103 working face of Wenzhuang Coal Mine as the prototype, a similar experimental platform for heterogeneous goaf was established to explore the evolution law of temperature distribution in goaf under different flow field conditions, and the influence of different wind speed and unsteady wind flow conditions on the evolution of temperature distribution in goaf was analyzed. The results show that both porosity and wind flow have a certain influence on the temperature distribution, and the temperature distribution will be biased towards the large porosity area and the downwind area of the wind flow. Under the condition of unsteady flow field, the high temperature area of goaf will expand, resulting in the increase of coal spontaneous combustion danger area. The migration phenomenon of high temperature area and high temperature point under the action of airflow was found, and the migration principle was revealed.

Keywords

• coal spontaneous combustion
• flow field
• temperature distribution
• high-temperature area
• unsteady-state wind flow
• goaf