Medium-deep efficient-heat-exchange geothermal well system

Abstract

A medium-deep efficient-heat-exchange geothermal well system comprises an overground heat exchange system and an underground heat exchange system. The underground heat exchange system comprises a heatexchange pipe, a heat exchange well and a heat storage layer. The heat storage pipe is located in the heat exchange well and communicates with the overground heat exchange system. The heat exchange pipe comprises a geothermal well water feed pipe section, a geothermal well U-shaped pipe section and a geothermal well water discharge pipe section which sequentially communicate. A part of the geothermal well water feed pipe section, a part of geothermal well water discharge pipe section and the geothermal well U-shaped pipe section are located in the heat storage layer. The geothermal well waterfeed pipe section and the geothermal well water discharge pipe section communicate with the overground heat exchange system. The heat exchange well comprises a geothermal well primary spud-in sleeveand a geothermal well secondary spud-in sleeve which are connected with each other, wherein the geothermal well first-spud sleeve is located outside the geothermal well water feed pipe section and thegeothermal well water discharge pipe section. A part of the geothermal well second-spud sleeve extends into the heat storage layer. The medium-deep efficient-heat-exchange geothermal well system hasthe advantages of saving energy and being environmentally friendly and high in heat exchange efficiency.

Description

technical field [0001] The invention belongs to the technical field of geothermal wells and utilization of geothermal energy, and in particular relates to a mid-deep layer geothermal well system with high-efficiency heat exchange. Background technique [0002] Compared with other energy sources, geothermal heating has the special advantages of saving fossil fuels and not causing urban air pollution. As an alternative new energy source, its development and utilization are being paid attention to. [0003] The geothermal water mining system can be divided into two types: direct utilization and indirect utilization according to the utilization method: direct utilization is to introduce geothermal water directly into the heat user system; indirect utilization is to heat the secondary water with geothermal water through surface heat exchangers, The secondary water enters the heat user system to circulate heat. A large amount of groundwater is exploited directly in the geothermal...

AI Technical Summary

Problems solved by technology

A large amount of groundwater is exploited directly in the geothermal water heating system, which will cause insufficient groundwater supply and the groundwater level will drop year by year, and the geothermal water contains hydrogen sulfide and other components that will cause corrosion to the pipes and equipment of the geothermal water heating system

The indirect geothermal water heating system is more complicated, and the capital investment is higher, and the heat exchanger in the geothermal water heating system will also have the disadvantage of corrosion and scaling

[0004] In recent years, a concentric shaft single-well heat exchange technology has emerged in the industry. The main problem is that the heat exchange efficiency is low.

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