The air and air heat exchange system has been demonstrated by the expert group of the mine and China Coal Comprehensive Utilization Center, which does not affect the mine ventilation system, and is safe and reliable. The three-dimensional special-shaped tube super enhanced heat transfer technology is used to greatly improve the flow performance of the fluid inside and outside the pipe, reduce the dirt deposition, and the heat transfer coefficient is 3 times of the conventional technology. The heat exchange surface of the return air side is sprayed with nano polymer materials to prevent the adhesion of coal ash and dust To ensure the long-term reliability of heat exchange, modular design is adopted, which can be freely combined according to heat transfer load and mine site conditions. The heat transfer load of single module is from 1000kW, 1200kW to 2240kw, the pressure loss of return air side is less than 100Pa, pure countercurrent heat transfer, the mine return air with humidity of 90% can heat fresh air of - 25.4 ℃ to above 4 ℃.
The mine shaft antifreeze system based on wind and air heat exchange technology has been successfully operated in Zaoquan, Yangchangwan, maiduoshan, Jinfeng, jinjiaqu, etc. of Ningxia coal industry group. All the design objectives have been achieved and the shaft antifreeze task in heating season has been completed. According to the actual conditions of the mine, the integrated services of process technology, engineering design and complete set of equipment engineering are provided to ensure the safety and reliability of cooling engineering and economic and energy saving.

Exhaust air source heat pump and gush water source heat pump system: heat is extracted from the return air (or water inflow) of the mine to the heat exchange circulating water of the system, and the high temperature heat pump unit is used for heating. In winter, the heat is absorbed from the mine return air (or water gushing) of about 15 ℃ to make hot water of 45 ℃ ~ 60 ℃ for heating and heating. In summer, if there is cooling demand, the system can also reverse cycle, providing air conditioning chilled water for refrigeration. At the same time, the system can extract 3-5kw low-grade heat energy from the mine return air, and produce 4-6kw heating capacity in total.
Using heat pump system, high temperature hot water can be produced in winter, which can not only meet the demand of fresh air heating at wellhead, but also meet the demand of heating water and bathing hot water in mining area. It can optimize energy utilization in mining area.
The exhaust air heat extraction box is used at the heat taking end, and the fresh air heat exchanger is used at the fresh air side. The unit is modularized with high integration and wide application range.
The heat extraction box can realize two-stage or even multi-stage heat extraction, so that the temperature after exhaust air heat extraction is gradually reduced to below zero.
The exhaust air heating box can realize automatic defrosting.
The high temperature heat pump unit adopts the international famous brand semi closed compressor. It integrates several decades of experience in unit matching and integration of Wuhan cooling plant, and has hundreds of sets of supporting capacity every year, with advanced technology and reliable performance.

With the increase of mining depth, the high temperature heat damage is more and more serious. "Coal mine safety regulations" stipulates that "when the air temperature of the mining face exceeds 30 ℃ and the air temperature of the mechanical and electrical equipment chamber exceeds 34 ℃, the operation must be stopped." The mine explosion-proof refrigeration device provides 3 ℃～ 15 ℃ chilled water to the air cooler of working face, which can reduce the working face temperature to below 30 ℃.
The mine explosion-proof refrigeration device uses freon as refrigerant, which is mainly composed of screw compressor, condenser, evaporator, economizer and necessary electrical automatic control equipment.
The company's mine explosion-proof refrigeration device is an independent underground cooling special equipment, which has obtained the national patent authorization and safety standard certification of national mining product safety mark center. The refrigerating capacity of a single unit covers 400KW to 3300kW.