Study of energy-efficient heat resistance and cooling technology for high temperature working face with multiple heat sources in deep mine

Abstract

Abstract In the present research, we proposed a scheme to address the issues of severe heat damage, high energy consumption, low cooling system efficiency, and wastage of cold capacity in mines. To elucidate the seasonal variations of environmental temperature through field measurements, we selected a high-temperature working face in a deep mine as our engineering background. To enhance the heat damage control cability of the working face and minimize unnecessary cooling capacity loss, we introduced the multi-dimensional heat hazard prevention and control method called "Heat source barrier and cooling equipment". First, we utilize shotcrete and liquid nitrogen injection to eliminate the heat source and implemented pressure equalization ventilation to disrupt the heat transfer path, thereby creating a heat barrier. Second, we establish divisional prediction models for airflow temperature based on the variation patterns obtained through numerical simulation. Third, we devise the location and dynamic control strategy for the cooling equipment based on the prediction models. The results of field application show that the heat resistance and cooling linkage method comply with the safety requirement throughout the entire mining cycle while effectively reducing energy consumption. The ambient temperature is maintained below 30 °C, resulting in the energy saving of 10% during the high-temperature period and over 50% during the low-temperature period. These findings serve as a valuable reference for managing heat damage in high-temperature working faces.

Keywords

• High-temperature working face
• Heat source barrier
• Multiple heat source effect
• Airflow temperature prediction
• Dynamic control strategy