A system and method for comprehensive utilization of waste heat recovery from return air wells in cold mining areas

Abstract

The invention discloses a comprehensive utilization system and method for waste heat recovery of return air shafts in cold mining areas. The device includes a waste heat recovery preheating mechanism and a semiconductor thermoelectric conversion mechanism; the method includes steps 1, installation of a return air filter; Filtration of the mine return air in the shaft; 3. Recovery of waste heat from the mine return air and preheating of the incoming air; 4. Judging whether the temperature of the air flow in the air intake shaft is greater than the set minimum temperature; 5. The semiconductor thermoelectric conversion mechanism charges the battery; 6. 1. The semiconductor thermoelectric conversion mechanism heats the intake air; 7. Judges again whether the air flow temperature in the intake shaft is greater than the set minimum temperature; 8. The electric auxiliary heater heats the intake air. The invention can recover the waste heat of the return air, and at the same time, can carry out air intake preheating and temperature difference power generation through the recovered waste heat, realizes the energy comprehensive utilization of power generation while heating the intake air, improves the utilization rate of energy, and realizes the Make the best use of it and save the inherent assets of mine construction.

Description

technical field [0001] The invention belongs to the technical field of mine waste heat recycling and energy saving, and in particular relates to a comprehensive utilization system and method for waste heat recovery of return air wells in cold mining areas. Background technique [0002] Low temperature is a major factor restricting mine mining. my country's "Safety Regulations for Metal and Nonmetal Mine" (GB 16423-2020) clearly states that the air temperature in the air inlet shaft should not be lower than 2°C; when it is lower than 2°C, there should be air Heating facilities, and open flames should not be used to directly heat the air entering the mine. There are many existing cold mining areas in my country. On the one hand, in the northern part of China, due to the high latitude, the ambient temperature in winter is low, and the temperature of the air inlet of the mine is generally lower than 2°C without preheating; on the other hand, the demand for resources in recent yea...

AI Technical Summary

Problems solved by technology

However, most of the current mine waste heat recovery devices use direct cooling or spraying for heat exchange, and the equipment is bulky, with high construction costs and high failure rates.

Although the heat pipe heat exchanger has extremely simple manufacturability and high heat transfer performance, it can be used to recycle waste heat in various forms of media such as solid, liquid, and gas, but due to the distance between the mine air inlet shaft and the return air shaft Usually far away, so sometimes there is a situation of poor preheating of the incoming air

Moreover, in the existing research, the heat exchange of heat pipes can only perform one-level energy recovery, and cannot adjust the cooling capacity, which will easily cause energy waste and cause overcooling or overheating, which will affect the physical comfort of workers.

At this stage, the recovery and utilization of mine return air waste heat is not perfect, and it cannot meet the requirements of full utilization of resources, energy-saving and green mining

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