Waste heat recovery and comprehensive utilization system and method for air return shaft in cold mining area

Abstract

The invention discloses a waste heat recovery and comprehensive utilization system and method for an air return shaft in a cold mining area. The waste heat recovery and comprehensive utilization system comprises a waste heat recovery preheating mechanism and a semiconductor thermoelectric conversion mechanism. The waste heat recovery and comprehensive utilization method comprises the following steps that step 1, a return air filter screen is mounted; step 2, mine return air in the return air shaft is filtered; step 3, mine return air waste heat is recycled and inlet air is pretreated; step 4, whether the air flow temperature in an air inlet shaft is larger than the set lowest temperature or not is judged; step 5, the semiconductor thermoelectric conversion mechanism charges a storage battery; step 6, the semiconductor thermoelectric conversion mechanism heats the inlet air; step 7, whether the air flow temperature in the air inlet shaft is larger than the set lowest temperature or not is judged again; and step 8, an electric auxiliary heater heats the inlet air. According to the waste heat recovery and comprehensive utilization system and method for the air return shaft in the cold mining area, return air waste heat can be recycled; and meanwhile, inlet air preheating and thermoelectric power generation can be carried out through the recycled waste heat, energy comprehensive utilization of power generation is achieved while inlet air is heated, the energy utilization rate is increased, the best use of materials is achieved, and inherent assets of mine construction are saved.

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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