Underground and ground recycling system for geothermal energy in coal mine area

Abstract

The invention discloses a coal mine area geothermal energy on-well and under-well cyclic utilization system which comprises a heat extraction circulation module, a secondary heat exchange module, a monitoring module, a temperature compensation module and a maintenance module, the heat extraction circulation module comprises a driving pump and an under-well heat exchanger, a flow guide wall pipe is installed in the under-well heat exchanger, the driving pump is connected with an under-well conveying pipe and an on-well return pipe, and the under-well conveying pipe is connected with a water inlet pipe. The underground conveying pipe and the ground return pipe are both inserted into the underground heat exchanger, the secondary heat exchange module comprises a secondary heat exchange device, the secondary heat exchange device comprises a first heat exchange box, a primary heat exchange output pipe and a primary heat exchange input pipe are fixedly connected between the first heat exchange box and the driving pump, and the temperature compensation module comprises a temperature compensation device. And a heating pipe is mounted on the temperature compensation device. Through related design, the utilization effect of geothermal energy is improved, the effect of taking heat without taking water is achieved, underground water resources cannot be damaged, in addition, generation of geothermal tail water can be avoided, the ecological environment is protected, and long-term circulating use is facilitated.

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