CN-121993271-A - Water-heating type/dry-heating rock type geothermal power generation and comprehensive utilization system

Abstract

The invention relates to the technical field of geothermal energy utilization, in particular to a water-heating type/dry-heating rock type geothermal power generation and comprehensive utilization system, which comprises a unit for utilizing water-heating type geothermal water, wherein the unit comprises a gas-liquid separator, a flash evaporator, a helium extraction membrane group, a steam turbine and a unit for utilizing dry-heating rock type geothermal water, wherein the unit comprises an organic Rankine cycle generator set; the liquid outlet of the flash evaporator is connected with the inlet of the steam turbine through a pipeline, the gas outlet of the steam turbine is connected with the inlet of the helium extraction membrane set through a pipeline, the liquid outlet of the flash evaporator is in heat exchange with the regenerator of the organic Rankine cycle generator set, the gas outlet of the flash evaporator is connected with the inlet of the steam turbine through a pipeline, and the output shaft of the steam turbine drives the helium extraction membrane set.

Inventors

• WANG LINGBAO
• GAN ZHI
• BU XIANBIAO
• LI HUASHAN
• GONG YULIE

Assignees

• 中国科学院广州能源研究所

Dates

Publication Date

20260508

Application Date

20241108

Claims (6)

1. 1. A water heating type/dry heating rock type geothermal power generation and comprehensive utilization system is characterized by comprising: A unit for utilizing hydrothermal geothermal water, the unit comprising a gas-liquid separator, a flash evaporator, a helium extraction membrane group and a steam turbine, and a unit for utilizing dry-thermal rock geothermal water, the unit comprising an organic Rankine cycle generator group; The liquid outlet of the flash evaporator is connected with the inlet of the steam turbine through a pipeline, the gas outlet of the steam turbine is connected with the inlet of the helium extraction membrane set through a pipeline, the liquid outlet of the flash evaporator is in heat exchange with the regenerator of the organic Rankine cycle generator set, the gas outlet of the flash evaporator is connected with the inlet of the steam turbine through a pipeline, and the output shaft of the steam turbine drives the helium extraction membrane set; The hot water is used for driving the steam turbine and the helium extraction membrane group, preheating working media of the organic Rankine cycle generator set, recharging underground for the hot water preheated by the working media of the organic Rankine cycle generator set, and recharging underground for the hot water of dry rock type after the hot water is used for driving the organic Rankine cycle generator set.
2. 2. The hydro-thermal/dry thermal rock geothermal power generation and utilization system of claim 1, further comprising an electronic expansion valve disposed between the gas-liquid separator and the flash evaporator.
3. 3. The water heating type/dry heating rock type geothermal power generation and comprehensive utilization system according to claim 1, further comprising a helium storage tank, wherein an inlet of the helium storage tank is connected with a helium outlet of the helium extraction membrane group through a pipeline.
4. 4. The water heating type/dry heating rock type geothermal power generation and comprehensive utilization system according to claim 1, further comprising a condenser and a fresh water tank, wherein an inlet of the condenser is connected with an outlet of the steam turbine through a pipeline, and an inlet of the fresh water tank is connected with an outlet of the condenser through a pipeline.
5. 5. The hydro-thermal type/dry-thermal rock type geothermal power generation and comprehensive utilization system according to claim 1 is characterized in that the organic Rankine cycle power generation unit comprises an evaporator, an expander, a condenser, a working medium pump, a heat regenerator and a power generator, wherein the evaporator, the expander, the condenser, the working medium pump and the heat regenerator are sequentially connected through pipelines to form a loop, the dry-thermal rock type geothermal water exchanges heat with the evaporator, and the expander drives the power generator to generate power.
6. 6. The water heating type/dry hot rock type geothermal power generation and comprehensive utilization system according to claim 5, further comprising a mixing water tank, wherein the mixing water tank is used for receiving dry hot rock type geothermal water after heat exchange with the evaporator, the mixing water tank is further connected with a gas outlet of the helium extraction membrane group through a pipeline with an air compressor, and an outlet of the mixing water tank is connected with an underground dry hot rock system through a pipeline.

Description

Water-heating type/dry-heating rock type geothermal power generation and comprehensive utilization system Technical Field The invention relates to the technical field of geothermal energy utilization, in particular to a water heating type/dry heating rock type geothermal power generation and comprehensive utilization system. Background As a renewable energy source, the geothermal energy has the advantages of rich reserve, strong stability, good continuity, high utilization coefficient and the like, and the geothermal resource is efficiently developed and utilized to assist the achievement of the double carbon target in China. Geothermal resources can be classified into shallow geothermal resources, hydrothermal geothermal resources and dry thermal rock geothermal resources according to temperature and occurrence states. Dry thermal rock refers to rock (body) at high temperatures underground but lacking or lacking fluids due to low porosity and low permeability, and the heat stored in the dry thermal rock needs to be manually fractured to form an Enhanced Geothermal System (EGS) to be exploited. The scale of geothermal energy generated in the dry hot rock is huge, and the energy contained in the dry hot rock with the buried depth of 3-10 km in the crust is equivalent to 30 times of the energy of the traditional fossil. The data of the Chinese geological survey show that the total amount of the dry hot rock resources in the depth of 3-10 km in China is 2.5 multiplied by 1025J (combined 856 trillion t standard coal), and the total amount of the dry hot rock resources is approximately 10 ten thousand times of the shallow geothermal resources. Depending on the difficulty level, enhanced geothermal systems (Enhanced Geothermal Systems, abbreviated EGS) development techniques can be divided into three categories, in-field EGS, near-field EGS, and greenfield EGS. In-field EGS refers to EGS developed in a hydro-thermal geothermal field, while near-field EGS is developed near the hydro-thermal geothermal field. The development of in-field EGS and near-field EGS has been typically performed by DESERTPEAK, GEYSERS, RAFT RIVER, bradys, etc. The problem of thermal storage temperature attenuation in the dry-hot rock development process brings certain challenges to the applicability of the above-ground power generation technology. Based on the spatial association relation of the geothermal resources of the hydrothermal type and the dry-hot rock, the construction of the coupling enhancement technology of the two geothermal resource power generation is particularly urgent. The existing geothermal resource development and utilization mode focuses on the 'energy' attribute, and generalized comprehensive cascade utilization fully exerts the 'energy' attribute and the 'mineral' attribute of geothermal resources, and extracts mineral resources while developing energy. Helium is a non-renewable scarce resource and has an irreplaceable role in the fields of aerospace, nuclear industry and the like. The helium reserves in China only account for 2.1% of the global reserves, and the external dependence is as high as more than 98%, so that the development of helium resources in geothermal fluid has important significance for reducing external dependence and improving helium-lean situation. In addition, the development of geothermal fluid helium extraction technology is also helpful for improving the comprehensive utilization efficiency of geothermal resources and promoting the high-quality development of geothermal energy industry. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a water-heating type/dry-heating rock type geothermal power generation and comprehensive utilization system, which can simultaneously utilize water-heating type geothermal resources and dry-heating rock type geothermal resources, can extract mineral resources such as helium in geothermal fluid and the like while generating power, and improves the comprehensive utilization rate of the resources. In order to achieve the above purpose, the present invention provides the following technical solutions: A water-heating type/dry-heating rock type geothermal power generation and comprehensive utilization system comprises: A unit for utilizing hydrothermal geothermal water, the unit comprising a gas-liquid separator, a flash evaporator, a helium extraction membrane group and a steam turbine, and a unit for utilizing dry-thermal rock geothermal water, the unit comprising an organic Rankine cycle generator group; The liquid outlet of the flash evaporator is connected with the inlet of the steam turbine through a pipeline, the gas outlet of the steam turbine is connected with the inlet of the helium extraction membrane set through a pipeline, the liquid outlet of the flash evaporator is in heat exchange with the regenerator of the organic Rankine cycle generator set, the gas outlet of the flash evaporator is connected with the inlet o