Solar-energy-combined dual-well closed enhanced type geothermal heating system

Abstract

The invention discloses a solar-energy-combined dual-well closed enhanced type geothermal heating system. The system comprises a first heat supply system, a second heat supply system and a heat storage system. The first heat supply system comprises a circulating pump, a heat pump and a dual-well closed enhanced type geothermal system body. The dual-well closed enhanced type geothermal system bodycomprises an injection well and a production well. The injection well is connected with the circulating pump and a first inlet of the heat pump in sequence. The production well is connected with a first outlet of the heat pump. Both a second inlet and a second outlet of the heat pump are connected with a target building. The second heat supply system comprises a solar thermal collector, a heat storage water tank and a hot water pump. An outlet of the solar thermal collector is connected with the heat storage water tank, the hot water pump and the target building in sequence. An inlet of the solar thermal collector is connected with the target building. According to the solar-energy-combined dual-well closed enhanced type geothermal heating system, solar energy and the dual-well closed enhanced type geothermal system body are combined to carry out heating during heating seasons, and the problem that solar energy is unstable is solved by utilizing the adjustment capacity of the geothermal system body; and heat of solar energy is stored into the geothermal system body during non-heating seasons.

Description

technical field [0001] The invention relates to the technical field of clean energy heating, in particular to a closed-type enhanced geothermal heating system combined with solar energy and double wells. Background technique [0002] For areas where hydrothermal geothermal resources are scarce, if large-scale exploitation of geothermal energy is required, two methods are often used, one is to use the traditional enhanced geothermal system (EGS), and the other is to use closed deep well heat exchangers ( DBHE). EGS creates high-permeability fractures in low-permeability rocks by means of hydraulic fracturing, and realizes convective heat exchange between fluid and rock. This heat exchange method can greatly improve the heat exchange of water and rocks, and is a way to realize thermal energy exploitation of dry hot rocks. a promising way. However, EGS mainly faces four problems: (1) high cost of hydraulic fracturing, (2) difficulty in controlling the direction of fractures, ...

AI Technical Summary

Problems solved by technology

However, EGS mainly faces four problems: 1. High cost of hydraulic fracturing; 2. Difficult to control the direction of fractures;

Although DBHE is a promising geothermal development technology, it mainly relies on the heat conduction of rocks to transfer the heat of surrounding rocks to the wellbore. Due to the low thermal conductivity of rocks, the heat extraction power of a single well is small.

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