Prevention and control of heat damage in coal mine

1. The air temperature of underground mining face and Electromechanical chamber should comply with the current “coal mine safety regulations”

2 in the design of new and expanded mines, the identified temperature prediction method should be used to predict and calculate the mine temperature according to the mine exploration geological report and the relevant data provided by the construction unit, and cooling measures should be taken at the over temperature places

3 comprehensive cooling measures should be taken for mines with temperature exceeding the limit

4 according to the specific conditions of the mine, non artificial refrigeration should be used to reduce the temperature, such as using natural cold source, increasing the air supply or increasing the local wind speed of the workers, downward ventilation or co flow ventilation, avoiding underground heat source, isolating or reducing the heat source to the air inlet, draining or plugging the hot water Personal protection measures

5 the use of artificial cooling should be based on the mine geological conditions, development and mining system, roadway layout, mine ventilation system, cooling range, mining depth, cooling load, mine inflow and water quality and temperature, return air volume and temperature, mining mechanization degree, heat source and experience of similar mines, Local cooling measures such as underground mobile air conditioning or compressed air refrigeration, ground central air conditioning system, ground and underground combined air conditioning system are selected< (1) according to the air conditioning system, the air volume to be treated and the cooling load, the underground air handling equipment and facilities should adopt direct evaporation type, water-cooled surface type, spray type cooler or spray chamber (2) the underground air can be treated in a centralized way or separately in each cooling place (3) when the amount of air to be treated is large, the cooling load is large, or the temperature difference of natural air in long and narrow space is greater than 10 ℃, it is difficult to achieve the effect or uneconomical to use a single air treatment equipment or facility, the comprehensive air treatment mode should be adopted (4) the processing air volume of air handling equipment should be determined according to the cooling load and the temperature difference of supply air, but it should not be greater than the air volume of the roadway where the supply is located. For the heading face, the treated air volume shall not exceed 70% of the air volume supplied by the full negative pressure of the working face< (1) cooling tower or natural water can be used to remove condensation heat on the ground (2) when the cooling mode of underground central air conditioning system is adopted, if the water quality, quantity and temperature of underground water are appropriate or the treatment is appropriate, it is preferred to use underground water to remove condensation heat; When the underground water is not applicable, it should be determined after technical and economic comparison of the discharge methods, such as removing the condensation heat from the mine return air and discharging the condenser circulating cooling water to the ground for cooling treatment< (3) the wet bulb temperature of return air should not be higher than 29 ℃ when the condensation heat is removed by return air< The selection of refrigerants should meet the requirements of fire prevention, non explosion, non toxicity, high condensation temperature, low condensation pressure, low price and environmental protection the standby coefficient of cooling load of 9 refrigerator can be 110-120, and the number of refrigeration equipment should not be less tha2. When the cooling load is large, the large refrigerator should be selected 10 when the refrigeration station is set on the ground, the design and layout of the refrigeration room shall comply with the relevant provisions of the current national standard code for design of heating, ventilation and air conditioning (GB 50019). The distance between the refrigerator room and the air inlet wellhead should not be less than 50m, and it should be under the dominant wind direction in summer 11 when the refrigeration station is located underground, the location and layout of the refrigeration chamber should be conducive to cooling and removing condensation heat, and meet the requirements of equipment handling, installation, maintenance, operation and safety when the well depth is more than 600m, the coupling device must be used for the cooling capacity transmission of the ground central air conditioning system. The selection of coupling mode should consider the factors of safety, energy saving, high efficiency, convenient maintenance and management. After technical and economic demonstration, shell and tube high and low pressure heat exchanger, water energy recovery device, multi cavity hot pressure converter and other equipment should be selected 13 the water supply pipe of the cooling capacity transmission pipe shall be insulated. Whether the return pipe is insulated or not should be determined according to the ambient temperature of the return pipe. The cooling capacity transmission shall meet the following requirements: (1) the pipeline insulation material and structure shall be fireproof, moisture-proof, air proof and non-toxic to avoid “cold bridge”, and the temperature rise shall not be higher than 06 ℃ / 1000m< (2) the pipeline can be laid in the form of wall hanging, overhead or trench, and the cold pipe should not be arranged in the return air lane (3) according to the source of raw materials, corrosiveness, water solubility, refrigerant temperature and price, low-temperature refrigerant should use calcium chloride solution, glycol solution or glycerol solution, and the concentration of the solution should be determined according to the refrigerant temperature 14 hydraulic balance calculation shall be conducted for the pipe network of cooling system and cooling water system in the mine refrigeration system. The hydraulic system design shall comply with the relevant provisions of the current national standards “code for design of building water supply and drainage” GB 50015 and “code for design of heating, ventilation and air conditioning” GB 50019 this article is reprinted by 1nternet media, which only represents the author’s point of view and has nothing to do with China labor insurance network. 1f the information column articles and comments violate your legal rights, please call to let us know and we will deal with them in time

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