Geothermal development system and the construction method thereof

A geothermal development system, wherein comprising a ground lifting system, where a large-diameter vertical shaft, an underground high temperature and high pressure heat transfer pool, a heat transfer diversion channel, a hot mine blasting fracture reservoir formed by an approach blasting roadway and a main roadway;

• the geothermal development system is provided with an injection pipe and a collection pipe along an inner wall of a large-diameter vertical shaft;
• the injection pipe is connected with the collection pipe through the heat transfer diversion channel in a borehole of the underground high temperature and high pressure heat transfer pool in a dry hot rock;
• the main roadway for circulation is arranged around the underground high temperature and high pressure heat transfer pool;
• the main roadway is arranged longitudinally along the large-diameter vertical shaft and the underground high temperature and high pressure heat transfer pool;
• the approach blasting roadway is arranged horizontally in multiple drainage channels along the main roadway, and rock is loosened and blasted by caving method to form a hot mine blasting fracture reservoir;
• a movable sealing device is arranged above the large-diameter vertical shaft corresponding to the hot mine blasting fracture reservoir;
• then, water is injected into the underground high temperature and high pressure heat transfer pool to store water and form hydrothermal rock through the injection pipe, and a water injection function will not be recovered and closed;
• using a U-tube principle, cold water and the hydrothermal rock in the underground high temperature and high pressure heat transfer pool are exchanged for heat by the injection pipe and the collection pipe, realizing a double heat transfer;
• the cold water not only obtains the heat in the dry hot rock, but also absorbs the heat of water heat exchange, forming a closed heat exchange system;
• personnel, equipment and mine resources are transported by the ground lifting system;
• the injection pipe and the collection pipe are connected to a power generation working platform installed on surface power generation system to form a closed cycle.