Simple heat taking method for efficiently and cleanly utilizing geothermal energy

Abstract

The invention discloses a simple heat taking method for efficiently and cleanly utilizing geothermal energy. The problems that during existing geothermal heat taking, equipment is huge, the construction cost is high, and underground water is prone to being polluted are solved. A total thought of taking heat without taking water is adopted, a traditional manner of extracting underground hot water is abandoned, a heat exchanger for exchanging heat between supercritical CO2 and hot water is arranged in an underground hot well, heat energy of the underground hot water is directly exchanged into asupercritical CO2 working medium underground, and the supercritical CO2 working medium obtaining the energy is pumped to the ground for power generation or heat exchange through a supercritical CO2 circulating pump; the supercritical CO2 after acting is sent back to an underground heat exchanger to obtain heat energy again, the process is repeated, so that efficient utilization of the undergroundheat energy is achieved; and in the whole process, the underground hot water does not need to be pumped to the ground and is isolated from a heat exchange medium, so that clean utilization is achieved, and the ground surface structure is protected.

Description

technical field [0001] The invention relates to a geothermal energy utilization system, in particular to a simple and fast heat extraction system and a heat extraction method that can cleanly utilize geothermal energy with high efficiency. Background technique [0002] Supercritical CO 2 The circulatory system (Supercritical Carbon Dioxide Cycle) is a system that utilizes supercritical CO 2 As a working fluid power generation system, the system uses CO in a supercritical pressure state 2 As a circulating working fluid, heat is absorbed in the heat exchanger, and then converted into supercritical CO 2 , entering the turbine to expand and do work, thereby driving the generator to generate electricity, and completing the work of supercritical CO 2 , return to the heat exchanger to absorb heat through the cooler and circulating pump, and then enter the turbine to expand and do work, so that the power generation task is completed; supercritical CO 2 The heat exchanger in the ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a simple and efficient heat extraction method for efficient and clean utilization of geothermal heat energy, which solves the technical problems of large equipment, high construction costs and easy pollution of groundwater existing in existing geothermal heat extraction

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