Coal mines are the main source of energy supply in China, but the emissions of exhaust gas, wastewater, waste residue, and other pollutants generated during coal mining are of high quality, resulting in serious environmental pollution. In this context, coal mining enterprises need to take energy-saving and emission reduction measures to maximize resource utilization and reduce the impact on the environment. The coal mine exhaust heat recovery heat pump system is an effective energy-saving and emission reduction technology. This article will elaborate on its principles and functions.

1、 Principle of Heat Pump System for Waste Heat Recovery from Coal Mine Exhaust Air

During the process of coal mining, continuous ventilation is required to ensure the circulation of air within the mine. During the ventilation process, a certain amount of exhaust air will be generated, which is the unused air discharged from the mine through the exhaust fan. In addition, there is also a certain amount of waste heat generated in the ventilation system of coal mines. If these waste air and waste heat are not properly utilized, it will cause energy waste and environmental pollution. Therefore, the heat pump system for recovering waste heat from coal mine exhaust air has emerged.

The principle of the coal mine exhaust heat recovery heat pump system is as follows: Firstly, the system sucks the exhaust air from the coal mine into the recovery system through a fan. The heat in the exhaust air passes through the recovery heat exchanger and is transferred to the working fluid in the recovery system. The working fluid evaporates in the evaporator, absorbs heat, and is then compressed into a high-temperature and high-pressure gas, which enters the condenser. In the condenser, high-temperature and high-pressure gases come into contact with the cooling water inside the condenser, and after cooling, they are converted into high-temperature and high-pressure liquids. Then, the high-temperature and high-pressure liquid is throttled and depressurized through the expansion valve, becoming a low-temperature and low-pressure liquid, and continuing to circulate.

The coal mine exhaust air and waste heat recovery heat pump system recovers the exhaust air and waste heat in the coal mine, converts them into energy, and provides them with wellhead antifreeze, building heating, and domestic hot water in the coal mine, thereby achieving the goal of energy conservation and emission reduction.

The Function of Heat Pump System for Waste Heat Recovery from Coal Mine Exhaust Air

Energy saving: The coal mine exhaust air and waste heat recovery heat pump system can convert the exhaust air and waste heat in the coal mine into energy, providing heat or cooling capacity for equipment in the coal mine, thereby saving the use of traditional energy such as coal and reducing energy consumption.

Reducing greenhouse gas emissions: The coal mine exhaust heat recovery heat pump system can effectively reduce greenhouse gas emissions from coal mines and reduce environmental pollution. At the same time, it can also reduce the discharge of pollutants such as wastewater and exhaust gas, reducing its impact on the environment.

Improving energy utilization efficiency: The coal mine exhaust air and waste heat recovery heat pump system converts the exhaust air and waste heat in the coal mine into energy, which can improve energy utilization efficiency, achieve maximum utilization of resources, and thus reduce the energy costs of enterprises.

Promoting green development: The use of coal mine exhaust air and waste heat recovery heat pump systems is in line with green development strategies and environmental requirements, which can enhance the environmental image of enterprises and promote their sustainable development.

The use of coal mine exhaust heat recovery heat pump system has multiple advantages, which can ensure the production safety of coal mines while achieving energy conservation and environmental protection.