Geothermal heating system for combining gradient flash evaporation afterheat recovery with heat pump technology

Abstract

The invention discloses a geothermal heating system for combining gradient flash evaporation afterheat recovery with a heat pump technology. The system comprises a submersible pump and a heating circulating water pump, and further comprises a first-grade flash evaporator and a second-grade flash evaporator; an outlet of the submersible pump is connected with the first-grade flash evaporator; and the first-grade flash evaporator is serially connected with the second-grade flash evaporator. The system further comprises a first-grade condenser and a second-grade condenser; the first-grade flash evaporator is connected with the first-grade condenser; and the second-grade flash evaporator is connected with the second-grade condenser. The system further comprises a heat pump; the heat pump is connected with the second-grade condenser; and the heating circulating water pump is connected with the first-grade condenser and the heat pump. The novel geothermal heating system built by the gradientflash evaporation and the heat pump technology uses heat recovered by the second-grade flash evaporator as a heat source of a heat pump main machine, so that heat in geothermal water is fully recovered; and meanwhile, the influence on the heating system by the water quality of geothermal water is lower, so that bad scaling caused by geothermal mineralization degree hot water is prevented.

Description

technical field [0001] The invention relates to the technical field of new energy development and utilization, in particular to a geothermal heating system with cascade flash waste heat recovery combined with heat pump technology. Background technique [0002] At present, in the mid-to-deep geothermal heating, most of the heating circulating water is directly heated by a plate heat exchanger and then recharged to the recharge well. For example, the Chinese patent with the publication number CN107270371A discloses a cascade utilization heating system of the same layer recharge electric heat pump for geothermal heating. The system is mainly composed of water pump, water well, plate heat exchanger, first valve, second valve, electric heat pump, recharge well, third valve and fourth valve. During operation, when the local hot water temperature is higher than 40°C, The geothermal water directly enters the plate heat exchanger to exchange heat with the heating return water, and t...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing geothermal heating is directly heated by the plate heat exchanger, which causes serious fouling of the heat exchanger, failure of the heat exchange effect, and even corrosion of the heat exchanger and the relatively high temperature of the recharged geothermal tail water. Provides a geothermal heating system with cascade flash waste heat recovery combined with heat pump technology

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