Constant-pressure gas storage control method, device and equipment based on gas-liquid phase change and medium

Abstract

The invention provides a constant-pressure gas storage control method, device and equipment based on gas-liquid phase change and a medium, and relates to the technical field of compressed gas energy storage, the gas storage device comprises a high-pressure gas storage unit and a heat insulation piston, and the method comprises the steps that according to CO2 energy release working condition parameters and N2O initial working condition parameters, the N2O energy release working condition parameters are determined through thermodynamic software; determining dryness change data of the N2O storage area, the work amount of the N2O and the heating amount of the N2O according to the energy release working condition parameters of the N2O, and determining the heating amount of the CO2 storage area according to the work amount of the N2O and the energy release working condition parameters of the CO2; according to the N2O heating capacity and the CO2 heating capacity, the temperature of the CO2 storage area and the dryness change of the gas-liquid phase change N2O storage area in the energy release process are controlled respectively, and a heat insulation piston is pushed to maintain the pressure of the CO2 storage area constant according to volume expansion generated by gas-liquid phase change of N2O. According to the invention, isothermal and isobaric release of high-pressure CO2 can be realized.

Description

Technical Field

[0001] The present invention relates to the field of compressed energy storage technology, and in particular to a constant-pressure gas storage control method, device, equipment and medium based on gas-liquid phase change. Background Art

[0002] Compressed CO2 energy storage uses electricity to compress and store carbon dioxide in geological structures or man-made tanks. When needed, the high-pressure CO2 is released to drive turbines for power generation. This technology is primarily used for large-scale grid energy storage to balance grid loads, increase renewable energy utilization, address the mismatch between supply and demand in the renewable energy power generation industry, and assist in peak-shaving.

[0003] A key challenge facing compressed CO2 energy storage systems is the periodic fluctuations in pressure within the high-pressure gas storage unit over time, which hinders real-time matching of the system's output power with grid demand. Current approaches to this challenge include employing a sliding-pressure expander operation mode, which is complex to control, and employing a throttle valve to maintain a constant expander inlet pressure. However, this valve can cause significant exergy losses, reducing the system's electrical-to-electrical conversion efficiency. Summary of the Invention

[0004] The problem solved by the present invention is to ensure that the pressure in the high-pressure gas storage unit remains constant during the storage / release process, fundamentally solving the key problems in the current compressed CO2 energy storage system, and improving the system's electric-to-electrical conversion efficiency while reducing exergy losses.

[0005] To solve the above problems, the present invention provides a constant pressure gas storage control method, device, equipment and medium based on gas-liquid phase change.

[0006] In a first aspect, the present invention provides a constant-pressure gas storage control method based on gas-liquid phase change, which is applied to a gas storage device based on gas-liquid phase change material in a compressed energy storage system. The gas storage device based on gas-liquid phase change material includes a high-pressure gas storage unit and an insulating piston disposed inside the high-pressure gas storage unit. The insulating piston divides the high-pressure gas storage unit into a CO2 storage area and a sealed gas-liquid phase change N2O storage area. The gas outlet of the high-pressure gas storage unit is disposed in the CO2 storage area. The constant pressure gas storage control method based on gas-liquid phase change includes: respectively obtaining the CO2 initial operating condition parameters of the CO2 storage area and the N2O initial operating condition parameters of the gas-liquid phase change N2O storage area; Using thermodynamic software, based on the CO2 initial operating condition parameters, determine the CO2 energy release operating condition parameters during the energy release process; based on the CO2 energy release operating condition parameters and the N2O initial operating condition parameters, determine the N2O energy release operating condition parameters during the energy release process; Determine the dryness change data, N2O work and N2O heating of the gas-liquid phase transition N2O storage area according to the N2O energy release operating parameters, and determine the CO2 heating of the CO2 storage area according to the N2O work and the CO2 energy release operating parameters; The temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area are controlled respectively according to the dryness change data, the N2O heating amount, and the CO2 heating amount.

[0007] Optionally, the CO2 initial operating condition parameters include CO2 mass flow, CO2 temperature, CO2 pressure and CO2 initial volume, the N2O initial operating condition parameters include N2O mass, N2O temperature, N2O pressure and N2O initial volume, the CO2 energy release operating condition parameters include CO2 density, CO2 change mass, CO2 change volume, CO2 specific thermodynamic energy and CO2 specific enthalpy, and the N2O energy release operating condition parameters include N2O change volume, N2O change density and N2O specific thermodynamic energy; The method of using thermodynamic software to determine the CO2 energy release parameters during the energy release process based on the CO2 initial operating parameters includes: Using the thermodynamic software and the law of conservation of mass, the CO2 density, the CO2 specific enthalpy, and the CO2 mass change are determined according to the CO2 temperature and the CO2 pressure; Determining the CO2 change volume according to the CO2 density, the CO2 initial volume, the CO2 change mass and the CO2 density; The CO 2 specific thermodynamic energy is determined based on the CO 2 density and the CO 2 pressure.

[0008] Optionally, determining the N2O energy release operating condition parameters during the energy release process based on the CO2 energy release operating condition parameters and the N2O initial operating condition parameters includes: Determining the N2O change volume based on the CO2 change volume; Determining the N2O change density according to the N2O change volume and the N2O mass; The thermodynamic software is used to determine the N2O specific thermodynamic energy based on the N2O density change and the N2O pressure.

[0009] Optionally, the determining of the dryness change data, N2O work amount, and N2O heating amount of the gas-liquid phase change N2O storage area according to the N2O energy release operating condition parameters includes: Using the thermodynamic software, the dryness change data is determined based on the N2O density change and the N2O pressure; determining the N2O work amount according to the N2O change volume and the N2O pressure; The N2O heating amount is determined according to the N2O work amount, the N2O mass, and the N2O specific thermodynamic energy.

[0010] Optionally, determining the N2O heating amount according to the N2O work amount, the N2O mass, and the N2O specific thermodynamic energy includes: The N2O heating amount is determined according to the N2O work, the N2O mass, and the N2O specific thermodynamic energy using an N2O heating amount formula, wherein the N2O heating amount formula includes: ; in, is the N2O heating amount, is the work done by N2O, is the N2O mass, is the N2O specific thermodynamic energy at the next energy release moment, t is time, is the time interval, is the specific thermodynamic energy of N2O at the current energy release moment.

[0011] Optionally, determining the CO2 heating amount of the CO2 storage area according to the N2O work amount and the CO2 energy release operating condition parameter includes: Determining the amount of work done by CO2 based on the amount of work done by N2O; The CO2 heating amount is determined based on the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate and the CO2 specific enthalpy.

[0012] Optionally, determining the CO2 heating amount according to the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate and the CO2 specific enthalpy includes: The CO2 heating amount is determined using a CO2 heating amount formula based on the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate, and the CO2 specific enthalpy. The CO2 heating amount formula includes: ; in, is the CO2 heating amount, is the CO2 mass change at the next energy release moment, t is time, is the time interval, is the CO2 specific thermodynamic energy, is the CO2 mass change at the current energy release moment, is the CO2 specific thermodynamic energy at the current energy release moment, mf is the CO2 mass flow rate, is the CO2 specific enthalpy, is the amount of work done by CO2.

[0013] In a second aspect, the present invention provides a constant-pressure gas storage control device based on gas-liquid phase change, which is applied to a gas storage device based on gas-liquid phase change material in a compressed CO2 energy storage system. The gas storage device based on gas-liquid phase change material includes a high-pressure gas storage unit and an insulating piston arranged inside the high-pressure gas storage unit. The insulating piston divides the high-pressure gas storage unit into a CO2 storage area and a sealed gas-liquid phase change N2O storage area. The gas outlet of the high-pressure gas storage unit is arranged in the CO2 storage area. The constant pressure gas storage control method based on gas-liquid phase change includes: an acquisition module, configured to respectively acquire the CO2 initial operating condition parameters of the CO2 storage area and the N2O initial operating condition parameters of the gas-liquid phase change N2O storage area; An energy release module, configured to determine, using thermodynamic software, CO2 energy release operating parameters during the energy release process based on the CO2 initial operating parameters, and to determine N2O energy release operating parameters during the energy release process based on the CO2 energy release operating parameters and the N2O initial operating parameters; A heating module is used to determine the dryness change data, N2O work and N2O heating of the gas-liquid phase transition N2O storage area according to the N2O energy release operating condition parameters, and to determine the CO2 heating of the CO2 storage area according to the N2O work and the CO2 energy release operating condition parameters; A control module is used to control the temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area according to the dryness change data, the N2O heating amount and the CO2 heating amount.

[0014] In a third aspect, the present invention provides an electronic device comprising a memory and a processor; The memory is used to store computer programs; The processor is used to implement the constant pressure gas storage control method based on gas-liquid phase change as described in the first aspect when executing the computer program.

[0015] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the constant-pressure gas storage control method based on gas-liquid phase change as described in the first aspect is implemented.

[0016] The beneficial effects of the constant pressure gas storage control method, device, equipment and medium based on gas-liquid phase change of the present invention are: By setting an adiabatic piston in the high-pressure gas storage unit, the high-pressure gas storage unit is divided into a CO2 storage area and a sealed gas-liquid phase change N2O storage area, and the gas-liquid phase change material N2O is filled in the gas-liquid phase change N2O storage area, the N2O can be heated during the energy release process to change from liquid to gas, and the density is reduced and the volume is expanded under the condition that the temperature of the sealed gas-liquid phase change N2O storage area remains unchanged, thereby pushing the adiabatic piston to compress the CO2 in the CO2 storage area. Since the mass of the CO2 in the CO2 storage area is reduced during the energy release process, the CO2 in the CO2 storage area is compressed. The amount and density will decrease, and the pressure in the CO2 storage area will also decrease. Therefore, the volume of the CO2 storage area is reduced by pushing the adiabatic piston through N2O to increase the density of CO2 in the CO2 storage area. According to the law of conservation of mass, the pressure of CO2 in the CO2 storage area can be guaranteed to be constant during energy release. At the same time, thermodynamic software is used to determine the CO2 energy release operating parameters during the energy release process through the CO2 initial operating parameters, and the N2O energy release parameters during the energy release process are determined based on the CO2 energy release operating parameters and the N2O initial operating parameters. Energy release operating parameters are then used. Based on the N2O energy release operating parameters, the dryness change data of the gas-liquid phase change N2O storage area during the energy release process, as well as the N2O work and N2O heating required to maintain a constant pressure, are determined. Furthermore, based on the N2O work and CO2 energy release operating parameters, the CO2 heating required to maintain a constant pressure in the CO2 storage area is determined. By heating the gas-liquid phase change N2O storage area with the N2O heating, the dryness change within the storage area is controlled, thereby precisely reducing the N2O density and expanding its volume. This drives the adiabatic piston to compress the CO2 within the CO2 storage area, ensuring a constant pressure within the CO2 storage area during energy release. Since the present invention does not employ a throttle valve, exergy loss caused by the throttle valve is avoided. Furthermore, heating the CO2 storage area with the CO2 heating can maintain a constant temperature within the CO2 storage area, thereby achieving an ideal state for the energy release process. This ensures stable operation of subsequent equipment in the gas-liquid phase change material storage device, such as the expander and the first-stage reheater, further reducing exergy loss caused by unstable operation of subsequent equipment. At the same time, the present invention can enable the expander to always operate under the designed working conditions, greatly improving the operating stability of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic flow chart of a constant-pressure gas storage control method based on gas-liquid phase change provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of a gas storage device based on a gas-liquid phase change material provided in an embodiment of the present invention; Figure 3 A schematic diagram of the gas energy release process of a gas storage device based on a gas-liquid phase change material provided in an embodiment of the present invention; Figure 4A schematic diagram of a curve showing dryness variation data provided by an embodiment of the present invention; Figure 5 A schematic diagram of a curve showing the N2O heating amount provided in an embodiment of the present invention; Figure 6 A schematic diagram of a curve showing the CO2 heating capacity provided by an embodiment of the present invention; Figure 7 A schematic diagram of a curve showing the volume of N2O provided in an embodiment of the present invention; Figure 8 A schematic structural diagram of a constant-pressure gas storage control device based on gas-liquid phase change provided in an embodiment of the present invention; Figure 9 A schematic structural diagram of an electronic device provided by an embodiment of the present invention.

[0018] Description of reference numerals: 1. High-pressure gas storage unit; 2. Insulated piston. DETAILED DESCRIPTION

[0019] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0021] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0022] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0023] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0024] In response to the problems existing in the above-mentioned related technologies, this embodiment provides a constant-pressure gas storage control method, device, equipment and medium based on gas-liquid phase change.

[0025] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a constant-pressure gas storage control method based on gas-liquid phase change, which is applied to a gas storage device based on gas-liquid phase change material in a compressed CO2 energy storage system. The gas storage device based on gas-liquid phase change material includes a high-pressure gas storage unit 1 and an insulating piston 2 arranged inside the high-pressure gas storage unit 1. The insulating piston 2 divides the high-pressure gas storage unit 1 into a CO2 storage area and a sealed gas-liquid phase change N2O storage area. The gas outlet of the high-pressure gas storage unit 1 is arranged in the CO2 storage area.

[0026] Specifically, the gas storage device based on gas-liquid phase change material includes a high-pressure gas storage unit 1 and an insulating piston 2 arranged inside the high-pressure gas storage unit 1. The insulating piston 2 divides the high-pressure gas storage unit 1 into a CO2 storage area and a sealed gas-liquid phase change N2O storage area. The insulating piston 2 can slide inside the high-pressure gas storage unit 1 to ensure that the pressure of the CO2 storage area and the gas-liquid phase change N2O storage area is constant, that is, the gas-liquid phase change N2O storage area can undergo a gas-liquid phase change, and the gas-liquid phase change of N2O causes the volume of N2O to expand, thereby releasing energy. During the process, the volume of the gas-liquid phase change N2O storage area expands, pushing the adiabatic piston 2 to maintain a constant pressure in the CO2 storage area. The gas outlet of the high-pressure gas storage unit 1 is arranged in the CO2 storage area. CO2 is stored in the CO2 storage area, and N2O is stored in the gas-liquid phase change N2O storage area. N2O is heated by an external heat source and can undergo a phase change, entering a gas-liquid coexistence state. It can achieve a reduction in density and an increase in volume without changing the temperature, so as to push the supercritical CO2 in the CO2 storage area to flow out of the high-pressure gas storage unit 1 at a constant pressure to do work.

[0027] The constant pressure gas storage control method based on gas-liquid phase change includes: The CO2 initial operating condition parameters of the CO2 storage area and the N2O initial operating condition parameters of the gas-liquid phase change N2O storage area are respectively obtained.

[0028] Specifically, the initial operating parameters of CO2 in the CO2 storage area and the initial operating parameters of N2O in the gas-liquid phase change N2O storage area are obtained respectively. The initial operating parameters of CO2 and N2O can be pre-set according to the actual situation. For example, the temperature of the CO2 storage area is set to 308 K, the pressure is set to 10 MPa, and the initial volume is set to 80 m 3 The temperature of the gas-liquid phase transition N2O storage zone is set to 308 K, the pressure is set to 7.01 MPa, and the initial volume is set to 60 m 3 The CO2 flow rate at the outlet is 5 kg / s, and the supplementary pressure of the adiabatic piston 2 is set to 2.99 MPa to balance the initial operating parameters of CO2 and the pressure of the gas-liquid phase change N2O storage area.

[0029] Using thermodynamic software, the CO2 energy release operating parameters during the energy release process are determined based on the CO2 initial operating parameters, and the N2O energy release operating parameters during the energy release process are determined based on the CO2 energy release operating parameters and the N2O initial operating parameters.

[0030] Specifically, by using thermodynamic software, such as refprop software, the CO2 energy release operating parameters in the energy release process can be accurately determined based on the functional relationship between the CO2 initial operating parameters and the thermodynamic software, and the N2O energy release operating parameters in the energy release process can be determined based on the CO2 energy release operating parameters and the N2O initial operating parameters, so as to facilitate subsequent calculations. Among them, determining the CO2 energy release operating parameters in the energy release process based on the functional relationship of the thermodynamic software according to the CO2 initial operating parameters is an existing technology and will not be repeated here.

[0031] According to the N2O energy release operating parameters, the dryness change data, N2O work and N2O heating of the gas-liquid phase change N2O storage area are determined respectively, and according to the N2O work and the CO2 energy release operating parameters, the CO2 heating of the CO2 storage area is determined.

[0032] Specifically, by using thermodynamic software, such as refprop software, according to the functional relationship between the N2O energy release parameters and the thermodynamic software, the dryness change data, N2O work and N2O heating of the gas-liquid phase change N2O storage area can be determined respectively, and the CO2 heating of the CO2 storage area can be determined according to the N2O work and CO2 energy release parameters, so as to control the temperature of the CO2 storage area and the dryness change of the gas-liquid phase change N2O storage area based on the N2O heating and CO2 heating. Figure 4 As shown, the dryness refers to the proportion of saturated gaseous N2O in the gas-liquid coexisting N2O in the high-pressure gas storage unit 1. The dryness change data can clarify the degree of gas-liquid phase change process in the high-pressure gas storage unit 1, thereby determining the state of N2O, that is, Figure 4 As shown in the figure, as the energy release time increases, when the dryness value is in the interval [0, 1], N2O is in a gas-liquid coexistence state, and the high-pressure CO2 release operation can be performed. As the energy release time increases, when it is outside the interval [0, 1], for example, when it is greater than 1, N2O is in a saturated gas state, and the energy release process can be completed, or when the volume change of the CO2 storage area reaches a preset volume change threshold, for example, 80 m 3 , complete the energy release process, where the preset change volume threshold can be set according to actual conditions. The N2O heating amount during the energy release process is as follows Figure 5 As shown, the CO2 heating capacity is Figure 6 shown.

[0033] The temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area are controlled respectively according to the dryness change data, the N2O heating amount, and the CO2 heating amount.

[0034] Specifically, the energy release process is as follows Figure 3 As shown, the energy release time is determined according to the volume change of the CO2 storage area. As the energy release time increases, the external heat source is used according to the following formula: Figure 5 The N2O heating amount shown in the figure heats the N2O storage area of ​​the gas-liquid phase change material so that the dryness of the gas-liquid phase change N2O storage area meets the following conditions: Figure 4 The dryness change data shown in the figure is used to make the gas-liquid phase change process occur in the N2O storage area, resulting in the N2O volume as follows: Figure 4 As shown in the figure, the volume of the N2O storage area of ​​the gas-liquid phase change material expands during the energy release process, pushing the adiabatic piston 2 to compress the volume of the CO2 storage area, so that the pressure in the CO2 storage area is constant. At the same time, the CO2 storage area is heated by the CO2 heating amount, that is, the heating amount of the CO2 storage area is the CO2 heating amount, so that its temperature is constant, thereby ensuring that the pressure and temperature of the entire system are constant.

[0035] In this embodiment, an insulating piston 2 is provided in the high-pressure gas storage unit 1 to divide the high-pressure gas storage unit 1 into a CO2 storage area and a sealed gas-liquid phase change N2O storage area, and the gas-liquid phase change material N2O is filled in the gas-liquid phase change N2O storage area. The N2O can be heated during the energy release process to change from liquid to gas, and the density can be reduced and the volume can be expanded while the temperature of the high-pressure gas storage unit 1 remains unchanged, thereby pushing the insulating piston 2 to compress the CO2 in the CO2 storage area. Due to the mass and The density will decrease, and the pressure in the CO2 storage area will also decrease. Therefore, the volume of the CO2 storage area is reduced by pushing the adiabatic piston 2 through N2O to increase the density of CO2 in the CO2 storage area. According to the law of conservation of mass, the pressure of CO2 in the CO2 storage area can be guaranteed to be constant during energy release. At the same time, thermodynamic software is used to determine the CO2 energy release operating parameters during the energy release process through the CO2 initial operating parameters, and the N2O energy release operating parameters during the energy release process are determined based on the CO2 energy release operating parameters and the N2O initial operating parameters. Then, according to the N2O energy release operating parameters, the dryness change data of the gas-liquid phase change N2O storage area during the energy release process, as well as the N2O work and N2O heating required to maintain a constant pressure are determined respectively. Moreover, according to the N2O work and CO2 energy release operating parameters, the CO2 heating required to maintain a constant pressure in the CO2 storage area is determined. Finally, the gas-liquid phase change N2O storage area is heated by the N2O heating, and its internal dryness change is controlled so that its internal dryness change conforms to the dryness change data. This can accurately reduce the N2O density and expand the volume to promote adiabatic activity. Plug 2 compresses the CO2 within the CO2 storage area, ensuring a constant pressure during energy release. Because the present invention does not employ a throttle valve, exergy loss caused by such a valve is avoided. Furthermore, by heating the CO2 storage area with the CO2 heat, the CO2 storage area is kept at a constant temperature, thereby achieving an ideal energy release state. This ensures stable operation of subsequent equipment in the gas-liquid phase change material storage device, such as the expander and primary reheater, further reducing exergy loss caused by unstable operation of subsequent equipment. Furthermore, the present invention enables the expander to consistently operate within its designed operating conditions, significantly improving system operational stability.

[0036] Optionally, the CO2 initial operating condition parameters include CO2 mass flow, CO2 temperature, CO2 pressure and CO2 initial volume, the N2O initial operating condition parameters include N2O mass, N2O temperature, N2O pressure and N2O initial volume, the CO2 energy release operating condition parameters include CO2 density, CO2 change mass, CO2 change volume, CO2 specific thermodynamic energy and CO2 specific enthalpy, and the N2O energy release operating condition parameters include N2O change volume, N2O change density and N2O specific thermodynamic energy; The method of using thermodynamic software to determine the CO2 energy release parameters during the energy release process based on the CO2 initial operating parameters includes: Using the thermodynamic software and the law of conservation of mass, the CO2 density, the CO2 specific enthalpy, and the CO2 mass change are determined according to the CO2 temperature and the CO2 pressure; Determining the CO2 change volume according to the CO2 density, the CO2 initial volume, the CO2 change mass and the CO2 density; The CO 2 specific thermodynamic energy is determined based on the CO 2 density and the CO 2 pressure.

[0037] Specifically, thermodynamic software is used to determine the CO2 density based on the CO2 temperature and CO2 pressure using the CO2 density formula. The CO2 specific enthalpy is determined based on the CO2 specific enthalpy formula. The CO2 change mass is determined based on the mass flow rate and the mass conservation formula. The CO2 change volume is determined based on the CO2 change mass and CO2 density and the law of mass conservation using the CO2 change volume formula. The CO2 specific thermodynamic energy is determined based on the CO2 density and CO2 pressure using the specific thermodynamic energy formula. The CO2 density formula includes: ; in, is the CO2 density, f 0 is the function of the thermodynamic software, P is the CO2 pressure, and T is the CO2 temperature.

[0038] The formula for CO2 specific enthalpy includes: ; in, is the CO2 specific enthalpy, f 1 is the function of thermodynamic software, P is CO2 pressure, and T is CO2 temperature.

[0039] The mass conservation formula includes: ; in, is the CO2 mass change at the next energy release moment, is the CO2 mass change at the current energy release moment, mf is the CO2 mass flow rate, is the time interval.

[0040] The formula for CO2 volume change includes: ; in, The formula for the CO2 volume change is: is the CO2 mass change at the next energy release moment, t is the energy release time, is the time interval, which can be set to 30s. is the CO2 mass change at the current energy release moment, is the density of CO2.

[0041] The specific thermodynamic energy formula includes: ; in, u is the specific thermodynamic energy of CO2, f is a function of the thermodynamic software, is the CO2 density, and P is the CO2 pressure.

[0042] Optionally, determining the N2O energy release operating condition parameters during the energy release process based on the CO2 energy release operating condition parameters and the N2O initial operating condition parameters includes: Determining the N2O change volume based on the CO2 change volume; Determining the N2O change density according to the N2O change volume and the N2O mass; The thermodynamic software is used to determine the N2O specific thermodynamic energy based on the N2O density change and the N2O pressure.

[0043] Specifically, since the high-pressure gas storage unit 1 is a rigid container with a constant total volume, the volume variables of the CO2 storage area and the gas-liquid phase change N2O storage area are the same. The N2O change volume can be determined based on the CO2 change volume. The sum of the CO2 change volume and the N2O change volume is the total volume of the high-pressure gas storage unit 1. Using thermodynamic software, the N2O change density and N2O pressure are substituted into the above-mentioned specific thermodynamic energy formula to determine the N2O specific thermodynamic energy. Based on the N2O change volume and N2O mass, the N2O change density formula is used to determine the N2O change density. The N2O change density formula includes: ; in, is the N2O density change at the next energy release moment, is the volume change of N2O at the next energy release moment, is the N2O mass change at the next energy release moment, t is the energy release time, is the time interval.

[0044] Optionally, the determining of the dryness change data, N2O work amount, and N2O heating amount of the gas-liquid phase change N2O storage area according to the N2O energy release operating condition parameters includes: Using the thermodynamic software, the dryness change data is determined based on the N2O density change and the N2O pressure; determining the N2O work amount according to the N2O change volume and the N2O pressure; The N2O heating amount is determined according to the N2O work amount, the N2O mass, and the N2O specific thermodynamic energy.

[0045] Specifically, the thermodynamic software is used to determine the dryness change data based on the N2O density change and the N2O pressure using the dryness formula. The N2O work amount is determined using the work formula. The heating process of the N2O storage area during the gas-liquid phase transition is a closed isobaric expansion process, so the N2O heating amount can be determined based on the law of conservation of energy. The dryness formula includes: ; in, is the dryness change data, g is a function of the thermodynamic software, P is the N2O pressure, is the N2O density change.

[0046] The work formula includes: ; in, is the work done by N2O, is the N2O pressure, is the volume change of N2O at the next energy release moment, is the volume change of N2O at the current energy release moment.

[0047] In one embodiment, determining the N2O heating amount based on the N2O work, the N2O mass, and the N2O specific thermodynamic energy includes: The N2O heating amount is determined according to the N2O work, the N2O mass, and the N2O specific thermodynamic energy using an N2O heating amount formula, wherein the N2O heating amount formula includes: ; in, is the N2O heating amount, is the work done by N2O, is the N2O mass, is the N2O specific thermodynamic energy at the next energy release moment, t is the energy release time, is the time interval, is the specific thermodynamic energy of N2O at the current energy release moment.

[0048] Optionally, determining the CO2 heating amount of the CO2 storage area according to the N2O work amount and the CO2 energy release operating condition parameter includes: Determining the amount of work done by CO2 based on the amount of work done by N2O; The CO2 heating amount is determined based on the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate and the CO2 specific enthalpy.

[0049] Specifically, the amount of work done by N2O and the amount of work done by CO2 are equal in value.

[0050] In one embodiment, determining the CO2 heating amount based on the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate, and the CO2 specific enthalpy includes: The CO2 heating amount is determined using a CO2 heating amount formula based on the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate, and the CO2 specific enthalpy. The CO2 heating amount formula includes: ; in, is the CO2 heating amount, is the CO2 mass change at the next energy release moment, t is time, is the time interval, is the CO2 specific thermodynamic energy at the next energy release moment, is the CO2 mass change at the current energy release moment, is the CO2 specific thermodynamic energy at the current energy release moment, mf is the CO2 mass flow rate, is the CO2 specific enthalpy, is the amount of work done by CO2.

[0051] Specifically, the specific thermodynamic energy of CO2 is calculated through the specific thermodynamic energy formula using the fixed CO2 density and CO2 pressure, so the specific thermodynamic energy of CO2 is also fixed. Since the specific thermodynamic energy is a state quantity and is described as the specific thermodynamic energy at a certain moment, the specific thermodynamic energy of CO2 at the next energy release moment and the specific thermodynamic energy of CO2 at the current energy release moment exist in this formula, and the specific thermodynamic energy of CO2 at the next energy release moment is equal to the specific thermodynamic energy of CO2 at the current energy release moment.

[0052] like Figure 8As shown, an embodiment of the present invention provides a constant-pressure gas storage control device 800 based on gas-liquid phase change, which is applied to a gas storage device based on gas-liquid phase change material in a compressed CO2 energy storage system. The gas storage device based on gas-liquid phase change material includes a high-pressure gas storage unit 1 and an insulating piston 2 provided inside the high-pressure gas storage unit 1. The insulating piston 2 divides the high-pressure gas storage unit 1 into a CO2 storage area and a sealed gas-liquid phase change N2O storage area. The gas outlet of the high-pressure gas storage unit 1 is provided in the CO2 storage area. The constant pressure gas storage control device 800 based on gas-liquid phase change includes: An acquisition module 810 is configured to respectively acquire the initial operating parameters of CO2 in the CO2 storage area and the initial operating parameters of N2O in the gas-liquid phase-change N2O storage area; The energy release module 820 is used to determine the CO2 energy release operating parameters during the energy release process based on the CO2 initial operating parameters using thermodynamic software, and to determine the N2O energy release operating parameters during the energy release process based on the CO2 energy release operating parameters and the N2O initial operating parameters; The heating module 830 is used to determine the dryness change data, N2O work and N2O heating of the gas-liquid phase transition N2O storage area according to the N2O energy release operating condition parameters, and determine the CO2 heating of the CO2 storage area according to the N2O work and the CO2 energy release operating condition parameters; The control module 840 is configured to control the temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area according to the dryness change data, the N2O heating amount, and the CO2 heating amount.

[0053] like Figure 9 As shown, an electronic device 900 provided by an embodiment of the present invention includes a memory 910 and a processor 920; the memory 910 is used to store computer programs; the processor 920 is used to implement the above-mentioned constant-pressure gas storage control method based on gas-liquid phase change when executing the computer program.

[0054] In other words, an electronic device 900 includes a memory 910 and a processor 920 coupled to the memory 910; the memory 910 is configured to store a computer program; and the processor 920 is configured to perform the following operations when executing the computer program: respectively obtaining the CO2 initial operating condition parameters of the CO2 storage area and the N2O initial operating condition parameters of the gas-liquid phase change N2O storage area; Using thermodynamic software, based on the CO2 initial operating condition parameters, determine the CO2 energy release operating condition parameters during the energy release process; based on the CO2 energy release operating condition parameters and the N2O initial operating condition parameters, determine the N2O energy release operating condition parameters during the energy release process; Determine the dryness change data, N2O work and N2O heating of the gas-liquid phase transition N2O storage area according to the N2O energy release operating parameters, and determine the CO2 heating of the CO2 storage area according to the N2O work and the CO2 energy release operating parameters; The temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area are controlled respectively according to the dryness change data, the N2O heating amount, and the CO2 heating amount.

[0055] An embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the constant-pressure gas storage control method based on gas-liquid phase change as described above is implemented.

[0056] In other words, a non-volatile computer-readable storage medium stores a computer program, which, when executed by a processor, causes the processor to perform the following operations: respectively obtaining the CO2 initial operating condition parameters of the CO2 storage area and the N2O initial operating condition parameters of the gas-liquid phase change N2O storage area; Using thermodynamic software, based on the CO2 initial operating condition parameters, determine the CO2 energy release operating condition parameters during the energy release process; based on the CO2 energy release operating condition parameters and the N2O initial operating condition parameters, determine the N2O energy release operating condition parameters during the energy release process; Determine the dryness change data, N2O work and N2O heating of the gas-liquid phase transition N2O storage area according to the N2O energy release operating parameters, and determine the CO2 heating of the CO2 storage area according to the N2O work and the CO2 energy release operating parameters; The temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area are controlled respectively according to the dryness change data, the N2O heating amount, and the CO2 heating amount.

[0057] An electronic device 900 that can serve as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device 900 is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device 900 can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0058] Electronic device 900 includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) or loaded from a storage unit into a random access memory (RAM). The RAM can also store various programs and data required for device operation. The computing unit, ROM, and RAM are interconnected via a bus. An input / output (I / O) interface is also connected to the bus.

[0059] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). In this application, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network elements. Some or all of these units can be selected based on actual needs to achieve the objectives of the embodiments of the present invention. Furthermore, the functional units in the various embodiments of the present invention can be integrated into a single processing unit, each unit can exist physically separately, or two or more units can be integrated into a single unit. These integrated units can be implemented in either hardware or software functional units.

[0060] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A constant pressure gas storage control method based on gas-liquid phase change, characterized in that: A gas storage device based on a gas-liquid phase change material used in a compressed CO2 energy storage system, the gas storage device based on a gas-liquid phase change material comprising a high-pressure gas storage unit (1) and a heat-insulating piston (2) arranged inside the high-pressure gas storage unit (1), the heat-insulating piston (2) dividing the high-pressure gas storage unit (1) into a CO2 storage area and a sealed gas-liquid phase change N2O storage area, the gas outlet of the high-pressure gas storage unit (1) being arranged in the CO2 storage area; The constant pressure gas storage control method based on gas-liquid phase change includes: respectively obtaining the CO2 initial operating condition parameters of the CO2 storage area and the N2O initial operating condition parameters of the gas-liquid phase change N2O storage area; Using thermodynamic software, based on the CO2 initial operating condition parameters, determine the CO2 energy release operating condition parameters during the energy release process; based on the CO2 energy release operating condition parameters and the N2O initial operating condition parameters, determine the N2O energy release operating condition parameters during the energy release process; Determine the dryness change data, N2O work and N2O heating of the gas-liquid phase transition N2O storage area according to the N2O energy release operating parameters, and determine the CO2 heating of the CO2 storage area according to the N2O work and the CO2 energy release operating parameters; The temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area are controlled respectively according to the dryness change data, the N2O heating amount, and the CO2 heating amount.

2. The constant pressure gas storage control method based on gas-liquid phase change according to claim 1 is characterized in that: The CO2 initial operating condition parameters include CO2 mass flow, CO2 temperature, CO2 pressure and CO2 initial volume, the N2O initial operating condition parameters include N2O mass, N2O temperature, N2O pressure and N2O initial volume, the CO2 energy release operating condition parameters include CO2 density, CO2 change mass, CO2 change volume, CO2 specific thermodynamic energy and CO2 specific enthalpy, and the N2O energy release operating condition parameters include N2O change volume, N2O change density and N2O specific thermodynamic energy; The method of using thermodynamic software to determine the CO2 energy release parameters during the energy release process based on the CO2 initial operating parameters includes: Using the thermodynamic software and the law of conservation of mass, the CO2 density, the CO2 specific enthalpy, and the CO2 mass change are determined according to the CO2 temperature and the CO2 pressure; Determining the CO2 change volume according to the CO2 density, the CO2 initial volume, the CO2 change mass and the CO2 density; The CO 2 specific thermodynamic energy is determined based on the CO 2 density and the CO 2 pressure.

3. The constant pressure gas storage control method based on gas-liquid phase change according to claim 2, characterized in that: The determining of the N2O energy release operating condition parameters during the energy release process based on the CO2 energy release operating condition parameters and the N2O initial operating condition parameters includes: Determining the N2O change volume based on the CO2 change volume; Determining the N2O change density according to the N2O change volume and the N2O mass; The thermodynamic software is used to determine the N2O specific thermodynamic energy based on the N2O density change and the N2O pressure.

4. The constant pressure gas storage control method based on gas-liquid phase change according to claim 2, characterized in that: The method of determining the dryness change data of the gas-liquid phase transition N2O storage area, the N2O work amount, and the N2O heating amount according to the N2O energy release operating condition parameters includes: Using the thermodynamic software, the dryness change data is determined based on the N2O density change and the N2O pressure; determining the N2O work amount according to the N2O change volume and the N2O pressure; The N2O heating amount is determined according to the N2O work amount, the N2O mass, and the N2O specific thermodynamic energy.

5. The constant pressure gas storage control method based on gas-liquid phase change according to claim 4 is characterized in that: The determining of the N2O heating amount according to the N2O work amount, the N2O mass, and the N2O specific thermodynamic energy includes: The N2O heating amount is determined according to the N2O work, the N2O mass, and the N2O specific thermodynamic energy using an N2O heating amount formula, wherein the N2O heating amount formula includes: ； in, is the N2O heating amount, is the work done by N2O, is the N2O mass, is the N2O specific thermodynamic energy at the next energy release moment, t is time, is the time interval, is the specific thermodynamic energy of N2O at the current energy release moment.

6. The constant pressure gas storage control method based on gas-liquid phase change according to claim 2, characterized in that: The determining of the CO2 heating amount of the CO2 storage area according to the N2O work amount and the CO2 energy release operating condition parameter includes: Determining the amount of work done by CO2 based on the amount of work done by N2O; The CO2 heating amount is determined based on the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate and the CO2 specific enthalpy.

7. The constant pressure gas storage control method based on gas-liquid phase change according to claim 6, characterized in that: Determining the CO2 heating amount according to the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate and the CO2 specific enthalpy includes: The CO2 heating amount is determined using a CO2 heating amount formula based on the CO2 work done, the CO2 mass change, the CO2 specific thermodynamic energy, the CO2 mass flow rate, and the CO2 specific enthalpy. The CO2 heating amount formula includes: ； in, is the CO2 heating amount, is the CO2 mass change at the next energy release moment, t is time, is the time interval, is the CO2 specific thermodynamic energy at the next energy release moment, is the CO2 mass change at the current energy release moment, is the CO2 specific thermodynamic energy at the current energy release moment, mf is the CO2 mass flow rate, is the CO2 specific enthalpy, is the amount of work done by CO2.

8. A constant pressure gas storage control device based on gas-liquid phase change, characterized in that: A gas storage device based on a gas-liquid phase change material used in a compressed CO2 energy storage system, the gas storage device based on a gas-liquid phase change material comprising a high-pressure gas storage unit (1) and a heat-insulating piston (2) arranged inside the high-pressure gas storage unit (1), the heat-insulating piston (2) dividing the high-pressure gas storage unit (1) into a CO2 storage area and a sealed gas-liquid phase change N2O storage area, the gas outlet of the high-pressure gas storage unit (1) being arranged in the CO2 storage area; The constant pressure gas storage control method based on gas-liquid phase change includes: an acquisition module, configured to respectively acquire the CO2 initial operating condition parameters of the CO2 storage area and the N2O initial operating condition parameters of the gas-liquid phase change N2O storage area; An energy release module, configured to determine, using thermodynamic software, CO2 energy release operating parameters during the energy release process based on the CO2 initial operating parameters, and to determine N2O energy release operating parameters during the energy release process based on the CO2 energy release operating parameters and the N2O initial operating parameters; A heating module is used to determine the dryness change data, N2O work and N2O heating of the gas-liquid phase transition N2O storage area according to the N2O energy release operating condition parameters, and to determine the CO2 heating of the CO2 storage area according to the N2O work and the CO2 energy release operating condition parameters; A control module is used to control the temperature of the CO2 storage area and the dryness change of the gas-liquid phase-change N2O storage area according to the dryness change data, the N2O heating amount and the CO2 heating amount.

9. An electronic device, characterized in that: including memory and processor; The memory is used to store computer programs; The processor is configured to implement the constant-pressure gas storage control method based on gas-liquid phase change as described in any one of claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by the processor, the constant-pressure gas storage control method based on gas-liquid phase change according to any one of claims 1 to 7 is implemented.

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