Direct expansion type mine return air source heat pump system and operation method thereof

Abstract

The invention relates to a direct expansion type mine return air source heat pump system and an operation method thereof. The direct expansion type mine return air source heat pump system comprises a diffusion tower which is arranged at a mine return air source outlet, wherein an air outlet is formed in the top of the diffusion tower; an external gas-liquid heat exchanger is arranged on the upper part of the air outlet and is filled with a refrigeration working medium; a plurality of heat pump machine sets are arranged in a heat pump machine set unit; each heat pump machine set comprises an internal heat exchanger, a compressor with a reversing valve and an expansion valve; the external gas-liquid heat exchanger is connected with a shell pipeline of the internal heat exchanger through the compressor and the expansion valve to form a refrigeration working medium heat exchanging circulation pipeline; and both ends of a heat exchanging pipeline in the internal heat exchanger are connected with a water inlet and a water outlet of a user equipment unit respectively to form a user heat exchanging circulation pipeline. The system is operated in a heating mode and a refrigerating mode by switching the reversing valve on the compressor. The direct expansion type mine return air source heat pump system can supply heat to coal mine building heating in winter, living hot water and wellhead freezing protection, supplies cold capacity to summer air conditioning and has effects of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to a heat pump system and its operation method, in particular to a direct expansion mine return air source heat pump system and its operation method for recycling low-temperature heat or cold in the mine return air source. Background technique [0002] At present, most domestic coal mine industrial sites require building heating, well shaft antifreeze, and domestic hot water for employees to bathe, all of which are provided by coal-fired boilers. This traditional heating method not only consumes a large amount of non-renewable energy, but also emits a large amount of greenhouse gases and other pollutants that are not conducive to environmental protection. Energy trends. [0003] Under normal circumstances, the mine return air volume is sufficient, and the temperature and humidity of the mine return air source are basically kept constant throughout the year. Therefore, how to fully recycle the low-temperature heat or cold in the m...

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Problems solved by technology

However, these existing mine return air source heat pump systems have some shortcomings. For example, when the original mine total return air diffusion tower does not meet the requirements of the mine return air source heat pump, it is necessary to modify the structure of the diffusion tower and redesign it. The supporting return air heat exchange underground sump, diversion tank and other facilities, the process is relatively complicated

On the other hand, most of the existing mine return air source heat pumps adopt the indirect expansion type, and the mine return air heat exchanger and the heat pump evaporator are set up separately, and the mine return air heat exchanger and the heat pump evaporator are connected through water or refrigerant, and then Secondary heat exchange with refrigerant in the evaporator, which will cause energy loss in the process of mine return air-water-refrigerant energy transfer

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