Not only hot water and high-sulfur coal mine underground mine high temperatures, and general metal mines with underground mining with the temperature will increase with depth increased, therefore, high temperature mines technology will be a metal mines have to face the future technical challenge. High temperature mine cooling measures include:
(1) Isolation of heat sources. Isolation of heat sources is the most fundamental, most important and economical measure of all heat hazard prevention measures. Specific measures, such as filling the empty area in time, give priority to the method of dewatering and lowering the water level for high-temperature mines with hot water as the main heat source.
(2) Strengthen ventilation. The main purpose of enhanced ventilation is to reduce the temperature rise of the unit air volume or increase the local wind speed. The former generally increases the air volume, while the latter uses the air ejector to achieve the purpose of cooling.
(3) Cool the airflow spray with cold water or ice water. The method mainly utilizes the gasification and heat absorption of water to achieve the purpose of cooling, for example, the ice is mixed with 27 ° C water to form a pyrite , and a cold water of about 10 ° C is formed, and the wind flow is sprayed on the working face into the air duct. The inlet air temperature of the working face decreased by an average of 5.5 ° C ~ 6.5 ° C , and the relative humidity increased from 40% to 50%.
(4) Artificial cooling and cooling. There are two types of artificial refrigeration: fixed refrigeration station and mobile air conditioner. The former is suitable for cooling of total airflow in the whole mine or production stage, while the latter is mainly used for wind cooling of a few high temperature working faces.
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