Mining parallel compression-condensation type ventilation air methane heat pump heat supply system

Abstract

The invention relates to a mining parallel compression-condensation type ventilation air methane heat pump heat supply system. The mining parallel compression-condensation type ventilation air methaneheat pump heat supply system comprises a first-stage direct evaporation heat removal compression-condensation parallel circulating unit, a second-stage direct evaporation heat removal compression-condensation parallel circulating unit, a user side heat and water supply water system unit, a second-stage heat removal defrosting unit and a self-cleaning unit. The step heat removal principle is utilized, the parallel compression-condensation technology is adopted, heat of mine ventilation air methane is transferred to a working medium circulating system in the system in a staged manner through aworking medium direct evaporation heat exchange manner, then heat is transmitted to heat user return water through a high-temperature condensation heat exchange manner, and therefore high-temperaturewater is provided for heat users. The two-stage series connection manner is adopted on the condensation heat exchange manner, the temperature difference of user side return water supply is increased,the pipeline construction quantity is reduced, and the overall energy efficiency of the heat supply system can be improved.

Description

technical field [0001] The invention relates to the technical field of mine exhaust air waste heat utilization, in particular to a mining parallel compression condensation cascade exhaust air heat pump heat supply system. Background technique [0002] During the construction and production of coal mines, there is a large amount of mine exhaust air. The exhaust air temperature is about 18°C ​​throughout the year, and the relative humidity is close to 100%. It contains a large amount of low-temperature waste heat resources and has a high recovery value. Coal mines also have heat demand for wellhead antifreeze in winter, hot water for bathing, and building heating. Therefore, through the effective use of exhaust heat, energy conservation and emission reduction in coal mines can be further realized. [0003] At present, the utilization methods of mine exhaust air waste heat mainly include spray heat extraction method, split direct steam heat extraction method, partition wall typ...

AI Technical Summary

Problems solved by technology

For example, the spray heat exchange method and the indirect antifreeze method need to be combined with a water source heat pump, and the recovery device is large in size, low in efficiency, and easy to corrode; in the split direct steam method, there are many connecting pipelines and a large amount of installation work; There are problems such as heat transfer limit, complex engineering and large application restrictions, and the recovered waste heat has a single use, etc.

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