Comprehensive energy utilization system combining pumped storage power station and hydrothermal type geothermal resource development system and operation method of comprehensive energy utilization system

Abstract

The invention relates to the field of energy engineering, in particular to a comprehensive energy utilization system combining a pumped storage power station and a hydrothermal type geothermal resource development system, comprising: a pumped storage power station for storing energy during the off-peak period of power grid load and generating power during the peak period; the hydrothermal type geothermal resource development system is used for collecting and utilizing geothermal energy and comprises a water injection well forming fluid circulation, a hot water reservoir, a water pumping well and a geothermal utilization system. The pressure coupling device is used for connecting a water drainage pipeline of the pumped storage power station with a water injection well of the hydrothermal geothermal resource development system and driving geothermal fluid to circulate by utilizing pressure generated during water drainage; and the energy conversion and control system is used for monitoring the load of the power grid, the operation condition of the geothermal well and the energy storage state of the pumped storage power station in real time, and regulating and controlling the working mode of the pumped storage power station and the collection and utilization of geothermal energy according to the monitored operation data.

Description

Technical Field

[0001] The present invention relates to the field of energy engineering, and specifically to an integrated energy system and an operation method thereof that integrates pumped storage technology with hydrothermal geothermal resource development technology, aiming to improve the flexibility and energy efficiency of the energy system. Background Art

[0002] As one of the most mature large-scale energy storage technologies, pumped storage power stations are widely used in peak-to-valley shifting, frequency and phase modulation, and emergency backup of power systems. Their advantage is that they can store and release electricity on a large scale and over a long period of time, which is of great significance for improving the flexibility and stability of power systems. Hydrothermal geothermal energy uses the heat energy of underground hot water for heating and power generation by drilling wells to obtain water, and uses reinjection technology to re-inject the low-temperature fluid into the ground to achieve sustainable utilization of geothermal resources.

[0003] However, the current pumped storage power station and geothermal well system have not been effectively integrated to achieve the complementary advantages of the two. Therefore, the present invention proposes a new type of integrated energy system, which aims to improve energy utilization efficiency, reduce dependence on fossil fuels, and promote the comprehensive development of renewable energy. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a comprehensive energy utilization system and an operation method thereof that combines a pumped storage power station with a hydrothermal geothermal resource development system, which can realize the comprehensive utilization of pumped storage and hydrothermal geothermal resources.

[0005] The object of the present invention is to achieve the following technical solution: a comprehensive energy utilization system combining a pumped storage power station and a hydrothermal geothermal resource development system, comprising: As the core energy storage unit of the system, the pumped storage power station uses surplus electricity to pump water from low-level reservoirs to high-level reservoirs for energy storage during the off-peak period of the power grid. When the power grid enters the peak load period, it quickly responds to the power grid demand by releasing water to generate electricity, providing stable and reliable power support.

[0006] The hydrothermal geothermal resource development system has injection wells and pumping wells, which are connected through hot water reservoirs in underground rock formations to form a fluid circulation system with the geothermal utilization system. The injection wells are responsible for injecting processed low-temperature fluids into the ground, using the heating effect of geothermal energy to heat the fluids. Subsequently, the high-temperature fluids are pumped out through the pumping wells and supplied to the geothermal utilization system for various purposes such as heating and power generation.

[0007] A pressure coupling device connects the discharge pipe of the pumped storage power station to the injection well of the medium-deep geothermal hydrothermal recharge well system. During the process of the pumped storage power station discharging water to generate electricity, the water flow with strong water pressure is directly transmitted to the injection well, thereby driving the circulation of geothermal fluid in the underground rock formation.

[0008] Energy conversion and control system, which can monitor the grid load, geothermal well operation status and energy storage status of pumped storage power station in real time, and intelligently adjust the working mode of pumped storage power station and geothermal energy collection and utilization strategy according to the monitored operation data. Through optimized scheduling and precise control, the maximum utilization of energy and the economical and stable operation of the system can be achieved.

[0009] In a further scheme, the pumped storage power station includes a high-level reservoir and a low-level reservoir, and realizes the mutual conversion of electrical energy and potential energy through water pumps and turbines.

[0010] In a further solution, a pressure sensor and a regulating valve are provided inside the pressure coupling device for monitoring and regulating the water flow pressure, and both are electrically connected to the energy conversion and control system.

[0011] In a further solution, the energy conversion and control system includes a central control unit and multiple sensors. The sensors are installed in a pumped storage power station, a hydrothermal geothermal resource development system and a pressure coupling device for collecting operating data, and the central control unit is used for analyzing and processing the operating data.

[0012] In a further solution, the energy conversion and control system also includes a data storage and analysis module, the data storage module is used to store operating data, and the analysis module analyzes the stored data and optimizes system performance based on the analysis results.

[0013] In a further solution, the energy conversion and control system also includes an alarm module. When the analysis module identifies that the monitoring parameters are abnormal, it sends a command to the alarm module, and the alarm module sends an alarm signal according to a preset alarm method.

[0014] Another technical solution of the present invention is: a method for operating the comprehensive energy utilization system, comprising the following steps: During the off-peak period of the power grid load, the pumps of the pumped storage power station are started to store energy; During the peak load period of the power grid, the turbine is turned on to generate electricity; Extract high-temperature fluid from the pumping well and supply it to the geothermal utilization system; By using a special reinjection pump or the pressure generated when a pumped-storage power station releases water, the low-temperature fluid used by the geothermal utilization system is reinjected into the injection well to form a closed cycle.

[0015] It also includes real-time monitoring of grid load, geothermal well operation status, and energy storage status of pumped-storage power stations. When abnormal conditions are detected in monitoring parameters, it will autonomously shut down part or all of the system to prevent further damage, and notify operation and maintenance personnel of the fault location and fault information via phone calls, text messages, etc., so that they can take timely maintenance measures to ensure safe and stable operation of the system.

[0016] Further plans also include adjusting the operating mode of the pumped-storage power station and the collection and utilization of geothermal energy based on real-time monitoring results.

[0017] A further solution also includes regularly evaluating system performance based on monitored operating data and adjusting operating parameters based on the evaluation results.

[0018] The beneficial effects of the present invention are as follows: by integrating the above-mentioned subsystems, the present invention realizes the use of surplus electricity to drive geothermal wells to collect thermal energy when the grid load is low, and the use of the natural discharge pressure of the pumped storage power station to promote the circulation of geothermal fluids during peak hours, thereby improving the energy utilization efficiency and economy of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the hydrothermal geothermal resource development system in the present invention.

[0021] Explanation of the reference numerals in the accompanying drawings: pumped-storage power station 1, pressure coupling device 2, hydrothermal geothermal resource development system 3, energy conversion and control system 4, geothermal power generation system 5, geothermal heating system 6, high-level water reservoir 11, plant system 12, low-level water reservoir 13, injection well 31, pumping well 32, underground rock and soil body 33, hot water reservoir 34. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings: As attached Figure 1 , 2 As shown, this embodiment provides a comprehensive energy utilization system combining a pumped storage power station and a hydrothermal geothermal resource development system, including a pumped storage power station 1, a pressure coupling device 2, a hydrothermal geothermal resource development system 3, an energy conversion and control system 4, a geothermal power generation system 5, a geothermal heating system 6, a high-level reservoir 11, a plant system 12, a low-level reservoir 13, an injection well 31, a pumping well 32, an underground rock and soil body 33 and a hot water reservoir 34.

[0023] Reference Figure 1In this system, the pumped storage power station 1 is responsible for pumping water to store energy when the grid load is low, and releasing water to generate electricity when the grid load is peak. The mutual conversion of electric energy and potential energy is realized through the two-way working mode of the pump turbine. During the low load period of the grid, the surplus electricity is used to drive the water pump located in the plant system 12 to pump the water in the low-level reservoir 13 to the high-level reservoir 11 for energy storage. In this process, the electric energy is converted into potential energy and stored. When the grid enters the peak load period, the water pump is turned off and the turbine is turned on, so that the water in the high-level reservoir 11 flows to the low-level reservoir through the turbine, driving the turbine to rotate and then driving the generator to generate electricity. In this process, the stored potential energy is released and converted into electric energy to supply the grid.

[0024] Reference Figure 2 , a hydrothermal geothermal resource development system 3, which includes an injection well 31, a hot water reservoir 34, a pumping well 32 and a geothermal utilization system to form a fluid circulation system, wherein the geothermal utilization system includes a geothermal power generation system 5 or a geothermal heating system 6. Before building a comprehensive energy utilization system combining a pumped storage power station and a hydrothermal geothermal resource development system, the regional geological and geothermal conditions are ascertained through geothermal surveys. If the temperature of the underground hot water reservoir is high, the geothermal power generation system is preferred, and if the temperature is low, the geothermal heating system is preferred. The geothermal power generation system 5 and the geothermal heating system 6 can use existing technologies. The pumping well 32 is responsible for extracting the high-temperature geothermal fluid in the underground hot water reservoir for heating or power generation purposes, and is connected to the geothermal power generation system 5 and the geothermal heating system 6; the injection well 31 is responsible for injecting the low-temperature fluid formed after heating or power generation into the underground hot water reservoir 34, using the heating effect of geothermal energy to heat the fluid and balance the extraction and production of water.

[0025] The pressure coupling device 2 is a key component that connects the discharge pipe of the pumped storage power station 1 and the injection well 31 of the hydrothermal geothermal resource development system 3. It uses the pressure generated when the pumped storage power station 1 discharges water to drive the fluid circulation of the hydrothermal geothermal resource development system. The pressure coupling device 2 is an existing engineering equipment, made of pressure-resistant and corrosion-resistant materials, with a reasonable flow channel design and sealing structure, and is equipped with control elements such as pressure sensors and regulating valves to ensure stable transmission and regulation of pressure. When the pumped storage power station 1 discharges water, the water flows into the pressure coupling device 2 through the discharge pipe. The pressure sensor in the device monitors the water flow pressure in real time and converts it into an electrical signal to transmit to the control system. The energy conversion and control system 4 adjusts the opening of the regulating valve according to the preset parameters and real-time data to control the water flow pressure and flow. Finally, the adjusted water flows into the injection well of the geothermal well through the injection pipe to drive the geothermal fluid circulation.

[0026] The energy conversion and control system 4 is electrically connected to the pumped storage power station 1 and the hydrothermal geothermal resource development system 3, and is responsible for intelligently regulating the working mode of the pumped storage power station 1 and the collection and utilization of geothermal energy according to the grid load and the operation status of the geothermal well. The system monitors the grid load, the operation status of the geothermal well (such as water temperature, water level, flow, etc.) and the energy storage state and operation parameters of the pumped storage power station in real time through sensors installed in key parts such as the pressure coupling device, the discharge pipe and pump turbine of the pumped storage power station, the pumping well, the injection well and the geothermal power generation system or the geothermal heating system in the hydrothermal geothermal resource development system. The collected data is transmitted to the central control unit for analysis and processing. The central control unit calculates the optimal control strategy and generates control instructions based on the preset algorithm and model. According to the control instructions, the system intelligently regulates the working mode of the pumped storage power station (pumping power, power generation power, etc.) and the collection and utilization of geothermal energy (injection flow and pressure, pumping flow, etc.). At the same time, the system also has fault detection and alarm functions. If it identifies abnormal conditions in the above monitoring parameters (for example, exceeding the safety threshold), it can autonomously take measures to shut down part or the entire system to prevent further harm, and notify the operation and maintenance personnel of the fault location and fault information through preset alarm methods (telephone, text message, etc.), so that the operation and maintenance personnel can take timely measures to repair and ensure the safe and stable operation of the system.

[0027] The present invention also provides an operation method, based on the above-mentioned integrated energy utilization system of the combined pumped storage power station and the hydrothermal geothermal resource development system, comprising the following steps: 1. System initialization and preparation Check the status of each subsystem: First, conduct a comprehensive inspection of the pumped storage power station 1, the pressure coupling device 2, the hydrothermal geothermal resource development system 3 and the energy conversion and control system 4 to ensure that each subsystem is in normal working condition.

[0028] Setting operating parameters: According to the grid load forecast, geothermal resource assessment and the actual operation of the system, set the key operating parameters such as the pumping power and power generation power of the pumped storage power station, the injection flow rate and pumping flow rate of the geothermal well.

[0029] 2. Operation of Pumped Storage Power Station Pumped storage: During the off-peak period of the power grid, the pumps of the pumped storage power station are started to pump water from the low-lying reservoir to the high-lying reservoir for energy storage. At this time, the energy conversion and control system 4 monitors the load of the power grid and intelligently adjusts the pumping power to match the surplus power of the power grid.

[0030] Water release for power generation: When the power grid enters the peak load period, the water pump is turned off and the turbine is turned on, so that the water in the high-level reservoir flows to the low-level reservoir through the turbine, drives the generator to generate electricity, and outputs the electricity to the power grid. During the power generation process, the system adjusts the power generation power in real time according to the power grid demand to ensure the stability and reliability of the power supply.

[0031] 3. Operation of hydrothermal geothermal resource development system When the grid load is low: surplus electricity is used to drive an electric pump to extract geothermal fluid in the underground hot water reservoir from the pumping well 32, which is converted into electrical energy or usable thermal energy through the geothermal power generation system 5 or the geothermal heating system 6 and output to the grid or heating network. Then, the low-temperature fluid formed after power generation or heating is injected into the underground hot water reservoir 34 through the injection well 31, and the heating effect of geothermal energy is used to heat the fluid and balance the extraction and production of water.

[0032] During peak load periods of the power grid: the use of surplus electricity to drive an electric pump is replaced by the use of a pressure coupling device 2 to utilize the water discharge and power generation process of a pumped storage power station to drive the circulation of geothermal fluid.

[0033] 4. Operation of energy conversion and control system Data collection and monitoring: The system monitors parameters such as grid load, geothermal well operation status (such as water temperature, water level, flow rate, etc.) and energy storage status of pumped storage power stations in real time through sensors installed in key locations (pressure coupling devices, discharge pipes and pump-turbines of pumped storage power stations, pumping wells, injection wells and geothermal power generation systems or geothermal heating systems in hydrothermal geothermal resource development systems, etc.).

[0034] Data analysis and processing: The collected data is transmitted to the central control unit for analysis and processing. The central control unit calculates the optimal control strategy and generates control instructions based on the preset algorithms and models.

[0035] Intelligent regulation: According to the control instructions, the system intelligently regulates the working mode of the pumped storage power station (such as pumping power, power generation power, etc.) and the collection and utilization of geothermal energy (such as injection flow, pumping flow, etc.).

[0036] Fault detection and alarm: When abnormal conditions are detected in the above monitoring parameters (for example, exceeding the safety threshold), the system can autonomously shut down part or all of the system to prevent further damage, and notify the operation and maintenance personnel of the fault location and fault information via phone calls, text messages, etc., so that the operation and maintenance personnel can take timely measures to repair and ensure the safe and stable operation of the system.

[0037] 5. System optimization and adjustment Performance evaluation: Based on the monitored operating data, the system performance is evaluated regularly (manually or based on preset algorithms and models), including energy efficiency, economic benefits, environmental impact and other aspects.

[0038] Parameter adjustment: Based on the evaluation results and actual needs, timely adjust and optimize the system operating parameters to improve the overall system performance and operating efficiency.

[0039] The above algorithms and models in this embodiment can all refer to the prior art.

[0040] The above is only a preferred embodiment of the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A comprehensive energy utilization system combining a pumped storage power station and a hydrothermal geothermal resource development system, characterized in that: include: Pumped storage power stations are used to store energy during off-peak hours and generate electricity during peak hours; Hydrothermal geothermal resource development system, used to collect and utilize geothermal energy, including injection wells, hot water reservoirs, pumping wells and geothermal utilization systems that form fluid circulation; The pressure coupling device is used to connect the water discharge pipeline of the pumped storage power station with the water injection well of the hydrothermal geothermal resource development system, and use the pressure generated during the water discharge to drive the circulation of geothermal fluid; The energy conversion and control system is used to monitor the grid load, geothermal well operation status and energy storage status of the pumped-storage power station in real time, and to adjust the working mode of the pumped-storage power station and the collection and utilization of geothermal energy according to the monitored operation data.

2. The comprehensive energy utilization system of the combined pumped storage power station and hydrothermal geothermal resource development system according to claim 1 is characterized in that: The pumped storage power station comprises a high-level reservoir and a low-level reservoir, and realizes mutual conversion between electric energy and potential energy through water pumps and water turbines.

3. The comprehensive energy utilization system of the combined pumped storage power station and hydrothermal geothermal resource development system according to claim 1 is characterized in that: The pressure coupling device is internally provided with a pressure sensor and a regulating valve for monitoring and regulating the water flow pressure, and both are electrically connected to the energy conversion and control system.

4. The comprehensive energy utilization system of the combined pumped storage power station and hydrothermal geothermal resource development system according to claim 1, characterized in that: The energy conversion and control system includes a central control unit and multiple sensors. The sensors are arranged in a pumped storage power station, a hydrothermal geothermal resource development system and a pressure coupling device for collecting operation data. The central control unit is used for analyzing and processing the operation data.

5. The comprehensive energy utilization system of the combined pumped storage power station and hydrothermal geothermal resource development system according to claim 4 is characterized in that: The energy conversion and control system also includes a data storage and analysis module. The data storage module is used to store operating data. The analysis module analyzes the stored data and optimizes system performance based on the analysis results.

6. The comprehensive energy utilization system of the combined pumped storage power station and hydrothermal geothermal resource development system according to claim 5, characterized in that: The energy conversion and control system also includes an alarm module. When the analysis module identifies that an abnormal situation occurs in the monitoring parameters, the alarm module sends a command to the alarm module, and the alarm module sends an alarm signal in a preset alarm mode.

7. An operating method of the integrated energy utilization system according to any one of claims 1 to 6, characterized in that: The following steps are involved: During the off-peak period of the power grid load, the pumps of the pumped storage power station are started to store energy; During the peak load period of the power grid, the turbine is turned on to generate electricity; Extract high-temperature fluid from the pumping well and supply it to the geothermal utilization system; By using a special reinjection pump or the pressure generated when a pumped-storage power station releases water, the low-temperature fluid used by the geothermal utilization system is reinjected into the injection well to form a closed cycle.

8. The operating method according to claim 7, characterized in that: It includes real-time monitoring of grid load, geothermal well operation status and energy storage status of pumped-storage power stations. When abnormal conditions are detected in monitoring parameters, it will autonomously shut down part or all of the system to prevent further damage, and notify operation and maintenance personnel of the fault location and fault information so that they can take timely maintenance measures to ensure safe and stable operation of the system.

9. The operating method according to claim 8, characterized in that: It also includes adjusting the operating mode of the pumped-storage power station and the collection and utilization of geothermal energy based on real-time monitoring results.

10. The operating method according to claim 9, characterized in that: It also includes regular evaluation of system performance based on monitored operating data and adjustment of operating parameters based on the evaluation results.

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