Direct-cooling deep-enthalpy heat-extracting coal mine gas heat pump system

Abstract

The invention discloses a direct-cooling deep-enthalpy heat-extracting coal mine gas heat pump system. The direct-cooling deep-enthalpy heat-extracting coal mine gas heat pump system comprises a coalmine gas heat extracting chamber. At least one coal mine gas heat extracting box is arranged on the coal mine gas heat extracting chamber and communicates with an evaporator of a heat pump unit. An anti-freezing solution flows through an anti-freezing solution pipeline. A circulating pump is installed on the anti-freezing solution pipeline. The anti-freezing solution absorbs heat in coal mine gaswhile flowing through the coal mine gas heat extracting box and transmits the heat absorbed from the coal mine gas to a refrigerant in the heat pump unit while flowing through the evaporator. A condenser in the heat pump unit is used for heat exchange with hot water for users. The direct-cooling deep-enthalpy heat-extracting coal mine gas heat pump system is simple in structure and high in coal mine gas waste heat recovery efficiency.

Description

technical field [0001] The invention relates to a waste heat recovery system, in particular to a system for recovering the waste heat of exhaust air (return air) in coal mines. Background technique [0002] Mine exhaust air (return air) has the characteristics of large air volume, stable air temperature, high relative humidity, and good continuity. Heat needs for heating, bath hot water preparation and wellhead antifreeze. At the same time, in summer, the exhaust air heat pump can be used for cooling in buildings or well cooling. [0003] At present, there are two main technical routes for the utilization of exhaust air waste heat in coal mines: one is the "sprinkling exhaust air heat pump" technical route, and the other is the "direct steam exhaust air heat pump" technical route. [0004] The principle of the technical route of the spraying type exhaust air heat pump is as follows: figure 1 As shown, by installing a spray device at the outlet of the return air diffusion ...

AI Technical Summary

Problems solved by technology

[0006] Sprinkling type exhaust air heat pump technology has the following disadvantages: (1) The utilization rate of return air is low, and the water vapor takes away a lot of waste heat; (2) The system is complex, including spraying system, circulation system, sump, filter, heat pump system, etc. (3) Due to the use of spray heat exchange, all the dirt in the exhaust air enters the water, resulting in frequent blockage of the filter and the unit, low efficiency, difficult maintenance, high cost, and low reliability; (4) The circulating water pump adopts an open type Circulation, high power consumption, and high operating costs; (5) The exhausted air takes limited heat, and the exhausted air takes heat not lower than 7°C; (6) The heat extraction side adopts an open cycle, and the exhausted air takes away a large amount of water vapor. Large amount of water replenishment in the system

[0007] The direct steam exhaust air heat pump technology has the following disadvantages: (1) The direct steam exhaust air heat pump technology is a large-scale split heat pump, there is no standard unit, and it needs professional design by equipment manufacturers, which is technically difficult; (2) The direct steam exhaust air heat pump The connection with the exhaust air heating box is a refrigerant pipeline. Due to the limitation of the compressor capacity and the oil return of the compressor, the distance between the unit and the exhaust air heating box should not be too far, usually not more than 200m. If the distance is too far, the compression It is difficult to return oil from the machine, the energy efficiency of the exhaust air heat pump is low, and the reliability of the exhaust air heat pump becomes poor; (3) The height difference between the exhaust air heat extraction box and the exhaust air heat pump unit should not be too large, otherwise it will lead to low energy efficiency of the compressor; ( 4) When the number of units is large, each exhaust air heat pump unit is connected to its own heating box through its own refrigerant pipeline, resulting in a large number of refrigerant pipelines, complex system and large investment; (5) The exhaust air is taken below the frost point for defrosting The problem is difficult to solve, and it is difficult to achieve two-stage heating

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