Category Archive mine ventilation

Mine exhaust heat extraction box with built-in air-to-air heat exchanger

The built-in air-to-air heat exchanger in the mine exhaust heat extraction box is a device specifically designed to recover waste heat from mine exhaust air. Mine exhaust refers to the low-temperature, high humidity waste gas discharged from a mine, which usually contains a certain amount of heat but is traditionally discharged directly without being utilized. This device uses a built-in air-to-air heat exchanger (i.e. air-to-air heat exchanger) to transfer heat from the exhaust air to another stream of cold air, thereby achieving the goal of waste heat recovery.

Working principle
Lack of air input: The mine's lack of air is introduced into the heat extraction box through the ventilation system. The temperature of the exhaust air is generally around 20 ℃ (the specific temperature varies depending on the depth of the mine and the environment), and the humidity is relatively high.
Function of Air to Air Heat Exchanger: The built-in air to air heat exchanger usually adopts a plate or tube structure, and the exhaust air and cold air exchange heat through a partition type in the heat exchanger. The heat from the lack of wind is transferred to the cold air, while the two airflows do not mix directly.
Heat output: After being heated by heat exchange, the cold air can be used for anti freezing of mine air inlet, heating of mining area buildings, or domestic hot water, while the exhaust air is discharged at a lower temperature after releasing heat.
Characteristics and advantages
Efficient and energy-saving: Air to air heat exchangers do not require additional working fluids and directly utilize the heat transfer from air to air. They have a simple structure and low operating costs.
Environmental friendliness: By recycling exhaust heat and reducing energy waste, it meets the requirements of green and low-carbon development.
Strong adaptability: The equipment can be customized and designed according to the flow rate and temperature of the mine exhaust, suitable for mines of different scales.
Easy maintenance: Compared to heat pipe or heat pump systems, air-to-air heat exchangers have a relatively simple structure and require less maintenance.
Application scenarios
Anti freezing at the wellhead: Use the recovered heat to heat the mine air intake and avoid freezing in winter.
Building heating: providing heating for office buildings, dormitories, etc. in the mining area.
Hot water supply: Combined with the subsequent system, provide a heat source for domestic hot water in the mining area.
precautions
Moisture treatment: Due to the high humidity of the exhaust air, the heat exchanger may face the problem of condensation water accumulation, and a drainage system or anti-corrosion materials need to be designed.
Heat transfer efficiency: The efficiency of an air-to-air heat exchanger is limited by the specific heat capacity and temperature difference of the air, and the recovered heat may not be as high as that of a heat pump system, but its advantage lies in its simple structure.

Mine ventilation waste heat recovery heat exchanger

Mine ventilation waste heat recovery heat exchangers are devices used to recover and utilize the waste heat generated from mine ventilation systems. In underground mining operations, a significant amount of heat is produced during the ventilation process, which is usually discharged into the atmosphere as waste.

The purpose of a waste heat recovery heat exchanger is to capture and transfer the heat from the mine ventilation air to another medium, such as water or air, for further use. The heat exchanger is typically installed in the ventilation system, where the hot ventilation air passes through it, transferring its heat to the secondary medium.

The heat transfer process in the heat exchanger allows the ventilation air to cool down while simultaneously heating up the secondary medium. The heated secondary medium can then be utilized for various applications, such as space heating, water heating, or even power generation.

By implementing waste heat recovery heat exchangers in mine ventilation systems, the heat energy that would otherwise be wasted can be effectively recovered and used, resulting in energy savings and improved overall energy efficiency of the mining operation. This approach not only reduces energy consumption but also contributes to a more sustainable and environmentally friendly mining industry.

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