Solutions to improve microclimate conditions for longwall in Mong Duong coal mine

Abstract

Microclimate conditions of underground coal mines are important factors affecting comfortable and safe working conditions for miners. The microclimate depends on the ventilation airflow parameters such as wind temperature, humidity and wind speed. Currently, Mong Duong coal mine is exploiting -250 m level and preparing for -400 m level. The strata temperature is about 320C, the heat dissipation from mining equipment, coal transporting and the mined space has increased the temperature at the CGH L7 longwall of the Mong Duong coal mine. The air temperature of the longwall greater than 300C, the humidity of 95÷100%, exceed the allowable standard, leading to the longwall is closed, affecting workers' health and labor productivity. Traditionally, ventilation method has been used to remove heat to ensure a safe working environment underground. However, when the ventilation system cannot provide suitable climatic conditions for underground workers, a cooling system is required. Selection of the most suitable cooling method depends on the intensity of the heat to be removed, the mining method, the location of the high temperature areas. The article analyzes the current state of microclimate, the temperature distribution of the longwall, the causes of the increase in the temperature of the longwall and the cooling solutions in the underground mine and proposes solutions to use air conditioners to reduce temperature and improve microclimate conditions for the CGH L7 longwall at Mong Duong coal mine. Results after application for this longwall of Mong Duong coal mine are guaranteed according to QCVN 01/2011/BCT