Low-ventilation-air-methane-temperature mine ventilation-air-methane residual heat extraction system

Abstract

The invention discloses a low-ventilation-air-methane-temperature mine ventilation-air-methane residual heat extraction system. According to the system, a positive-pressure system is formed by a mineventilation-air-methane air duct (1), an air-compressor residual heat recovery system (2), a mine ventilation-air-methane dust removal chamber (3), a ventilation-air-methane heat exchange chamber (4),an air source heat pump system (5) and the like; mine ventilation air methane passes through the mine ventilation-air-methane air duct (1), and is subjected to dust removal through the mine ventilation-air-methane dust removal chamber (3), then the mine ventilation air methane subjected to dust removal is sent into the ventilation-air-methane heat exchange chamber (4), and is subjected to heat exchange through the air source heat pump system (5) arranged in the ventilation-air-methane heat exchange chamber (4), and then the mine ventilation air methane subjected to heat exchange is exhaustedinto the atmosphere. The system is characterized in that the temperature and the dust removal effect of dust-removal spray water are guaranteed by adopting the combination of a wet-method dust removalway and the air-compressor residual heat recovery system; the whole heat exchange process, in the ventilation-air-methane heat exchange chamber, of the mine ventilation air methane is in a positive-pressure state and the mine-mouth antifreezing or mining-area heat supply demand is met after the energy of the mine ventilation air methane is extracted by utilizing an ultralow-temperature air sourceheat pump host machine.

Description

technical field [0001] The invention relates to a waste heat extraction system for low exhaust air temperature mine exhaust air, and belongs to the field of coal mine waste heat utilization systems. Background technique [0002] Mine exhaust air waste heat recovery system is currently widely used in hot summer and cold winter regions, that is, North China and East China. The system forms are mainly spray convection heat transfer type and deep enthalpy direct steam type. Among them, the spray convection heat transfer type is the main type in North China and East China, mainly because the depth of coal mines in North China and East China is relatively deep. The depth of the well is generally more than 400 meters. According to incomplete statistics, the annual temperature of the exhaust air in the mine is about 18-30°C, and because the winter outdoor temperature in North China and East China is higher than that in the Northwest and Northeast, the general winter temperature is -...

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Problems solved by technology

But the biggest problem with this method is that the heat pump host needs to be customized for different coal mine exhaust air systems, and the heat exchanger has been in an environment with a lot of dust and particulate impurities for a long time, and it is easy to be dirty and clogged to affect heat transfer, even if automatic cleaning is adopted Measures, the cleaning solution also needs to be customized and the freezing point must be extremely low to meet the requirements of use, which hinders the development of this system form both in terms of equipment stability and cost

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