Comprehensive utilization method and test equipment for surface water, goaf and geothermal energy in coal mining subsidence area

A comprehensive utilization method for surface water, a goaf and geothermal energy in a coal mining subsidence area, comprising the following steps:

• determining a geothermal water collection area;
• arranging heat energy exchange equipment in a roadway of a mine;
• arranging a geothermal water extraction system, wherein the geothermal water extraction system comprises geothermal wells, extraction pipelines and tail water reinjection pipelines, the extraction pipelines are connected with a water inlet of the heat energy exchange equipment, and the tail water reinjection pipelines are connected with a water outlet of the heat energy exchange equipment;
• arranging a water channel on the surface, and arranging a drainage system on a subsidence trough to guide surface water to flow underground;
• and
• controlling directional and ordered flow of surface water through the coal mining subsidence area formed by ground mining, the surface water is injected into geothermal water collection area to achieve sustainable mining of underground water, achieving complete space restoration of the underground water system in combination with space structures between ground pipelines, terrane fracture zones and sagging zones, and constructing a resource joint utilization system of the surface water-geothermal resource in the coal mining subsidence area to comprehensively utilize the coal mining subsidence area.