Gas injection waste heat utilization system, method, device, equipment and medium of gas storage

Abstract

The invention provides a gas storage gas injection waste heat utilization system, method, device and equipment and a medium, and belongs to the technical field of oil and gas field surface engineering. The system comprises a multi-stage gas injection compressor heat exchange system and an organic working medium recycling system, natural gas is compressed in a multi-stage mode through the multi-stage gas injection compressor heat exchange system, heat exchange with organic working medium liquid with different flows is achieved, natural gas waste heat recovery is achieved, after the organic working medium gas subjected to temperature rising is used for expansion acting power generation through the organic working medium cyclic utilization system, heat exchange and cooling with formation water are conducted, and the cooled organic working medium liquid is obtained; and then cyclic utilization is performed. By recycling the waste heat of the compressor and converting the waste heat into electric energy, the energy utilization efficiency of the gas storage is remarkably improved, energy waste is reduced, and meanwhile additional power supply is provided.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field surface engineering, and in particular to a gas storage reservoir gas injection waste heat utilization system, a gas storage reservoir gas injection waste heat utilization control method, a gas storage reservoir gas injection waste heat utilization control device, an electronic device and a computer-readable storage medium. Background Art

[0002] Under the general trend of global energy transformation and environmental protection, natural gas, as a clean and efficient energy source, has been increasing year by year in my country's energy structure. As an important natural gas storage and peak-shaving facility, underground gas storage plays an irreplaceable role in ensuring national energy security and stable gas supply. During the operation of underground gas storage, especially during the gas injection stage, natural gas needs to be compressed in multiple stages to increase pressure for storage.

[0003] At present, the compressed natural gas is mainly cooled by natural gas compression and cooling technology, and then stored in the gas storage. Specifically, the following steps are included: after the low-pressure natural gas is compressed in the first stage, the temperature rises from 10°C to 60°C, and then it is cooled to below 40°C through an air cooler; then the natural gas is compressed in the second stage, the temperature rises to 80°C, and it is cooled again through an air cooler; finally, the natural gas is compressed in the third stage, the temperature rises to above 95°C, and it is finally cooled to below 50°C through an air cooler so that it can enter the gas storage.

[0004] However, the existing natural gas compression and cooling technology cannot recover the waste heat generated during the compression process because the air cooler is unable to recover the waste heat generated during the compression process, resulting in a large amount of direct heat energy loss, which is not conducive to energy conservation and efficient utilization. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a system, method, device, equipment and medium for utilizing waste heat from gas injection in a gas storage facility to solve the above-mentioned problems.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a gas storage reservoir gas injection waste heat utilization system, comprising: a multi-stage gas injection compressor heat exchange system and an organic working fluid recycling system, wherein the heat exchange medium input end and the output end of the multi-stage gas injection compressor heat exchange system are simultaneously connected to the organic working fluid recycling system;

[0007] The multi-stage gas injection compressor heat exchange system is used to perform multi-stage compression processing on low-pressure natural gas to obtain high-pressure natural gas;

[0008] The multi-stage gas injection compressor heat exchange system is also used to use the organic working fluid liquid prefabricated at different flow rates to exchange heat with the corresponding natural gas after each stage of compression treatment, so as to obtain organic working fluid gas after different flow rates and temperature increase;

[0009] The organic working fluid recycling system is used to mix the heated organic working fluid gases at different flow rates to obtain mixed organic working fluid gases, and then use the mixed organic working fluid gases to expand and generate power, and then exchange heat with formation water to obtain cooled organic working fluid liquids;

[0010] The organic working fluid recycling system is also used to divert the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates.

[0011] Optionally, the organic working fluid recycling system is further used to perform gas-liquid separation on the mixed organic working fluid gas to obtain organic working fluid gas and organic working fluid liquid after gas-liquid separation;

[0012] The organic working fluid recycling system is also used to utilize the organic working fluid gas after gas-liquid separation to expand and generate power, and then exchange heat with formation water to obtain a cooled organic working fluid liquid;

[0013] The organic working fluid recycling system is also used to divert the organic working fluid liquid after cooling and the organic working fluid liquid after gas-liquid separation after mixing to obtain organic working fluid liquids with different flow rates.

[0014] Optionally, the organic working fluid recycling system is used to divert the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates when the gas storage is in full load condition;

[0015] The organic working fluid recycling system is used to store the cooled organic working fluid liquid when the gas storage is in peak load regulation condition.

[0016] Optionally, the multi-stage gas injection compressor heat exchange system includes: multiple gas injection compressors and corresponding multiple first heat exchangers, the multiple gas injection compressors are connected in series through the multiple first heat exchangers, the gas outlet end of the primary gas injection compressor is connected to the gas inlet end of the next stage gas injection compressor through the corresponding first heat exchanger, the gas inlet end of the primary gas injection compressor is connected to the natural gas pipeline network, the gas outlet end of the final stage gas injection compressor is connected to the geological reservoir, and the low-temperature medium output end and the low-temperature medium input end of the multiple first heat exchangers are simultaneously connected to the organic working fluid recycling system.

[0017] Optionally, the organic working fluid recycling system comprises: an expansion generator, a second heat exchanger and an organic working fluid circulation pump;

[0018] The output end of the organic working fluid circulation pump is respectively connected to the low-temperature medium input ends of multiple first heat exchangers, the low-temperature medium output ends of multiple first heat exchangers are respectively connected to the air inlet ends of the expansion generator, the exhaust end of the expansion generator is connected to the high-temperature medium output end of the second heat exchanger, the high-temperature medium output end of the second heat exchanger is connected to the input end of the organic working fluid circulation pump, the low-temperature medium input end of the second heat exchanger is connected to the formation water system, and the low-temperature medium output end of the second heat exchanger is connected to the cooling tower.

[0019] Optionally, the organic working fluid recycling system further comprises: a liquid separation tank;

[0020] The input end of the liquid separation tank is communicated with the low-temperature medium output ends of the plurality of first heat exchangers respectively, and the output end of the liquid separation tank is communicated with the air inlet end of the expansion generator.

[0021] Optionally, the organic working fluid recycling system further includes: a buffer tank;

[0022] The input end of the buffer is communicated with the low-temperature medium output end of the second heat exchanger, and the output end of the buffer is communicated with the input end of the organic working medium circulation pump.

[0023] Optionally, it also includes: a computing control system;

[0024] The computing control system is used to collect the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas and the temperature of the organic working fluid liquid at the inlet of each first heat exchanger;

[0025] The computing control system is also used to obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger based on the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each stage of the first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of the gas injection compressor of each stage, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid liquid;

[0026] The organic working fluid recycling system is also used to control the flow rate of the organic working fluid liquid flowing to each stage of the first heat exchanger to meet the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

[0027] Optionally, the computing control system includes: a first temperature monitoring sensor, a flow monitoring sensor, a second temperature monitoring sensor and a flow calculation device; the organic working fluid recycling system also includes: a control valve;

[0028] The first temperature monitoring sensor and the flow monitoring sensor are both arranged at the air inlet end of the primary air injection compressor, the second temperature monitoring sensor and the control valve are respectively arranged at the low-temperature medium input end of each first heat exchanger, the second temperature monitoring sensor is arranged at one end close to the low-temperature medium input end of each first heat exchanger, and the control valve is arranged at one end far away from the low-temperature medium input end of each first heat exchanger;

[0029] The first temperature monitoring sensor is used to collect the temperature of the low-pressure natural gas;

[0030] The flow monitoring sensor is used to collect the flow of low-pressure natural gas;

[0031] The second temperature monitoring sensor is used to collect the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger;

[0032] The flow calculation device is also used to calculate the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each stage of the first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of each stage of the gas injection compressor, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid using the following formula to obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger;

[0033] Among them, m i represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, m represents the flow rate of the low-pressure natural gas, C p1 represents the preset specific heat capacity of natural gas, r i represents the preset compression ratio of the i-th stage gas injection compressor, γ represents the preset adiabatic index of natural gas, T represents the temperature of low-pressure natural gas, C p2 represents the preset specific heat capacity of the organic working fluid, t i,出 represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, t i,入 represents the temperature of the organic working fluid gas at the inlet of the first heat exchanger of the i-th stage;

[0034] The flow calculation device is also used to generate a valve opening adjustment instruction corresponding to each stage of the first heat exchanger based on the flow of the organic working fluid liquid corresponding to each stage of the first heat exchanger;

[0035] The control valve corresponding to each stage of the first heat exchanger is used to adjust the opening of the control valve corresponding to each stage of the first heat exchanger when receiving the valve opening adjustment instruction corresponding to each stage of the first heat exchanger, so that the mass of the organic working fluid liquid flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

[0036] Optionally, the number of the gas injection compressor, the number of the first heat exchanger and the number of the control valve are three.

[0037] Optionally, the first heat exchanger and the second heat exchanger are both plate heat exchangers.

[0038] Optionally, the gas injection compressor is a reciprocating gas injection compressor.

[0039] Optionally, the organic working fluid is any one of propane, isobutane and propylene.

[0040] In a second aspect of an embodiment of the present invention, a method for controlling utilization of waste heat from gas injection in a gas storage is provided, which is implemented based on the above-mentioned system for utilizing waste heat from gas injection in a gas storage, and comprises:

[0041] Perform multi-stage compression on low-pressure natural gas to obtain high-pressure natural gas;

[0042] The organic working fluid liquid prefabricated at different flow rates is used to exchange heat with the corresponding natural gas after each stage of compression treatment to obtain organic working fluid gas after different flow rates and temperature increases;

[0043] Mixing the heated organic working fluid gases at different flow rates to obtain a mixed organic working fluid gas, and then using the mixed organic working fluid gas to expand and generate power for heat exchange with formation water to obtain a cooled organic working fluid liquid;

[0044] The cooled organic working fluid liquid is split to obtain organic working fluid liquids of different flow rates, and the organic working fluid liquids prefabricated with different flow rates are returned to exchange heat with the corresponding natural gas after each stage of compression treatment to obtain organic working fluid gases of different flow rates after heating.

[0045] Optionally, the mixed organic working fluid gas is expanded to generate power and then heat is exchanged with formation water to obtain a cooled organic working fluid liquid, including:

[0046] Performing gas-liquid separation on the mixed organic working fluid gas to obtain gas-liquid separated organic working fluid gas and organic working fluid liquid;

[0047] The organic working fluid gas after gas-liquid separation is expanded to generate power and then heat is exchanged with formation water to obtain a cooled organic working fluid liquid;

[0048] The organic working fluid liquid after cooling and the organic working fluid liquid after gas-liquid separation are mixed and then diverted to obtain organic working fluid liquids with different flow rates.

[0049] Optionally, the cooled organic working fluid liquid is split to obtain organic working fluid liquids with different flow rates, including:

[0050] When the gas storage is in full load condition, the cooled organic working fluid is diverted to obtain organic working fluids with different flow rates; or

[0051] When the gas storage is in peak load operation, the cooled organic working fluid liquid is stored.

[0052] Optionally, the cooled organic working fluid liquid is split to obtain organic working fluid liquids of different qualities, including:

[0053] Collecting the temperature of the organic working fluid liquid at the inlet of the first heat exchanger of each stage;

[0054] The temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each stage of the first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of each stage of the gas injection compressor, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid are calculated using the following formula to obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger;

[0055] Among them, m i represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, m represents the flow rate of the low-pressure natural gas, C p1 represents the preset specific heat capacity of natural gas, r i represents the preset compression ratio of the i-th stage gas injection compressor, γ represents the preset adiabatic index of natural gas, T represents the temperature of low-pressure natural gas, C p2 represents the preset specific heat capacity of the organic working fluid, t i,出 represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, t i,入 represents the temperature of the organic working fluid gas at the inlet of the first heat exchanger of the i-th stage;

[0056] Based on the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, a valve opening adjustment instruction corresponding to each stage of the first heat exchanger is generated;

[0057] The valve opening adjustment instruction corresponding to each stage of the first heat exchanger is sent to the control valve corresponding to each stage of the first heat exchanger to adjust the opening of the control valve corresponding to each stage of the first heat exchanger, so that the mass of the organic working fluid liquid flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

[0058] In a third aspect of the embodiments of the present invention, a gas storage gas injection waste heat utilization control device is provided, comprising:

[0059] The multi-stage compression module is used to control the multi-stage gas injection compressor heat exchange system to perform multi-stage compression processing on low-pressure natural gas to obtain high-pressure natural gas;

[0060] The multi-stage heat exchange module is used to control the multi-stage gas injection compressor heat exchange system to use the prefabricated organic working fluid liquid with different flow rates to exchange heat with the corresponding natural gas after each stage of compression treatment, so as to obtain the organic working fluid gas with different flow rates and temperature rise;

[0061] The power generation heat exchange module is used to control the organic working fluid recycling system to mix the heated organic working fluid gases at different flow rates to obtain mixed organic working fluid gases, and then use the mixed organic working fluid gases to expand and generate power to exchange heat with formation water to obtain cooled organic working fluid liquids;

[0062] The diversion circulation module is used to control the organic working fluid recycling system to divert the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates, and return to call the multi-stage compression module.

[0063] In a fourth aspect of the embodiments of the present invention, an electronic device is provided, comprising: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the above-mentioned gas storage reservoir gas injection waste heat utilization control method is executed.

[0064] In a fifth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, storing computer instructions, which, when executed on a computer, enable the computer to execute the above-mentioned gas storage gas injection waste heat utilization control method.

[0065] Beneficial effects of the present invention:

[0066] (1) Improve energy efficiency: By recovering and utilizing the waste heat generated by the compressor during the gas injection process, the system can improve the energy efficiency of the entire gas storage facility.

[0067] (2) Reduce energy waste: Usually, a compressor generates a lot of heat when compressing gas. If this heat is not used, it will be wasted. This system can effectively utilize this part of heat and reduce energy waste.

[0068] (3) Power generation capacity: The organic working fluid circulation system can be used to convert the recovered heat energy into electrical energy, thereby providing additional power supply for gas storage or other facilities.

[0069] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0071] Figure 1 It is a structural schematic diagram of a gas storage gas injection waste heat utilization system provided by an embodiment of the present invention;

[0072] Figure 2 It is a flow chart of a method for controlling utilization of waste heat from gas injection in a gas storage facility provided by an embodiment of the present invention;

[0073] Figure 3 It is a structural schematic diagram of a gas storage gas injection waste heat utilization control device provided in an embodiment of the present invention.

[0074] Description of Reference Numerals

[0075] 1-gas injection compressor; 2-first heat exchanger; 3-liquid separation tank; 4-expansion generator;

[0076] 5-second heat exchanger; 6-buffer tank; 7-organic working fluid circulation pump;

[0077] 8-first temperature monitoring sensor; 9-flow monitoring sensor;

[0078] 10 - second temperature monitoring sensor; 11 - computing device; 12 - control valve. DETAILED DESCRIPTION

[0079] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0081] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0082] Embodiment 1

[0083] Please refer to Figure 1 , Figure 1It is a structural schematic diagram of a gas storage gas injection waste heat utilization system provided by an embodiment of the present invention, the system comprising: a multi-stage gas injection compressor heat exchange system and an organic working fluid recycling system, the heat exchange medium input end and output end of the multi-stage gas injection compressor heat exchange system are simultaneously connected to the organic working fluid recycling system; the multi-stage gas injection compressor heat exchange system is used to perform multi-stage compression processing on low-pressure natural gas to obtain high-pressure natural gas; the multi-stage gas injection compressor heat exchange system is also used to use organic working fluid liquids prefabricated at different flow rates to exchange heat with the corresponding natural gas after each stage of compression processing to obtain organic working fluid gases after heating at different flow rates; the organic working fluid recycling system is used to mix organic working fluid gases after heating at different flow rates to obtain mixed organic working fluid gases, and after using the mixed organic working fluid gases to expand and generate power, perform heat exchange with formation water to obtain cooled organic working fluid liquid; the organic working fluid recycling system is also used to divert the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates.

[0084] In one embodiment, low-pressure natural gas comes from a natural gas pipeline network, and high-pressure natural gas is stored in a geological reservoir.

[0085] In one embodiment, the formation water comes from a formation water system, and the heated formation water flows to the cooling tower.

[0086] In one embodiment, the number of the plurality of gas injection compressors 1, the number of the plurality of first heat exchangers 2 and the number of the control valves 12 are all 3. In this embodiment, by setting a plurality of them, the reliability and redundancy of the system can be improved, ensuring that if one device fails, other devices can take over its work, thereby ensuring the continuous operation of the entire system.

[0087] In one embodiment, both the first heat exchanger 2 and the second heat exchanger 5 are plate heat exchangers. In this embodiment, since plate heat exchangers generally have the characteristics of high efficiency, small size and easy cleaning, plate heat exchangers are used to improve heat exchange efficiency and save space.

[0088] In one embodiment, the gas injection compressor 1 is a reciprocating gas injection compressor. In this embodiment, the reciprocating compressor can provide a higher pressure ratio and better gas processing performance.

[0089] In one embodiment, the organic working fluid is any one of propane, isobutane and propylene.

[0090] Specifically, the multi-stage gas injection compressor heat exchange system includes: multiple gas injection compressors 1 and corresponding multiple first heat exchangers 2, multiple gas injection compressors 1 are connected in series through multiple first heat exchangers 2, the gas outlet end of the primary gas injection compressor 1 is connected to the gas inlet end of the next stage gas injection compressor through the corresponding first heat exchanger 2, the gas inlet end of the primary gas injection compressor 1 is connected to the natural gas pipeline network, the gas outlet end of the final stage gas injection compressor 1 is connected to the geological reservoir, and the low-temperature medium output end and the low-temperature medium input end of the multiple first heat exchangers 2 are simultaneously connected to the organic working fluid recycling system.

[0091] Specifically, the organic working fluid recycling system includes: an expansion generator 4, a second heat exchanger 5 and an organic working fluid circulation pump 7; the output end of the organic working fluid circulation pump 7 is respectively connected to the low-temperature medium input ends of the multiple first heat exchangers 2, the low-temperature medium output ends of the multiple first heat exchangers 2 are respectively connected to the air inlet end of the expansion generator 4, the exhaust end of the expansion generator 4 is connected to the high-temperature medium output end of the second heat exchanger 5, the high-temperature medium output end of the second heat exchanger 5 is connected to the input end of the organic working fluid circulation pump 7, the low-temperature medium input end of the second heat exchanger 5 is connected to the formation water system (not shown), and the low-temperature medium output end of the second heat exchanger 5 is connected to the cooling tower (not shown).

[0092] In one embodiment, the organic working fluid recycling system is also used to perform gas-liquid separation on the mixed organic working fluid gas to obtain organic working fluid gas and organic working fluid liquid after gas-liquid separation; the organic working fluid recycling system is also used to utilize the organic working fluid gas after gas-liquid separation to expand and generate power, and then exchange heat with formation water to obtain cooled organic working fluid liquid; the organic working fluid recycling system is also used to divert the cooled organic working fluid liquid and the organic working fluid liquid after gas-liquid separation after mixing, to obtain organic working fluid liquids with different flow rates.

[0093] Specifically, the organic working fluid recycling system further includes: a liquid separator 3 ; the input end of the liquid separator 3 is respectively connected to the low-temperature medium output ends of the plurality of first heat exchangers 2 , and the output end of the liquid separator 3 is connected to the air inlet end of the expansion generator 4 .

[0094] In one embodiment, the organic working fluid recycling system is used to divert the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates when the gas storage reservoir is in a full load condition; the organic working fluid recycling system is used to store the cooled organic working fluid liquid when the gas storage reservoir is in a peak load condition.

[0095] A gas storage facility is at full capacity when its storage capacity has reached its designed maximum capacity and there is no more space to store additional natural gas. In this case, the gas storage facility can no longer accept more natural gas injection and must suspend or reduce the injection rate until natural gas is extracted or market demand increases.

[0096] A gas storage facility in peak-shaving operation means that the gas storage facility adjusts the injection and extraction of natural gas according to changes in market demand to meet peak market demand. Under peak-shaving conditions, the focus of gas storage operations is to balance the supply and demand of natural gas and ensure that sufficient natural gas supply can be provided during peak demand periods (such as winter or specific periods).

[0097] Specifically, the organic working medium recycling system further includes: a buffer tank 6 ; the buffer input end is connected to the low-temperature medium output end of the second heat exchanger 5 , and the buffer output end is connected to the input end of the organic working medium circulation pump 7 .

[0098] In one embodiment, the gas storage reservoir gas injection waste heat utilization system also includes: a computing control system; the computing control system is used to collect the temperature of low-pressure natural gas, the flow rate of low-pressure natural gas and the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger; the computing control system is also used to obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger based on the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each stage of the first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of the gas injection compressor at each stage, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid liquid; the organic working fluid recycling system is also used to control the flow rate of the organic working fluid liquid flowing to each stage of the first heat exchanger to meet the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

[0099] The temperature of natural gas refers to the thermodynamic temperature of natural gas under a specific state, and the unit is ℃.

[0100] The flow rate of natural gas refers to the volume or mass of natural gas passing through a pipeline or equipment per unit time, and is expressed in kg / h.

[0101] The temperature of the organic working fluid liquid at the inlet of each first stage heat exchanger refers to the temperature of the liquid state of the organic working fluid before entering the first stage heat exchanger for heat exchange, and the unit is °C.

[0102] The temperature of the organic working fluid gas at the outlet of each first stage heat exchanger refers to the outlet temperature when the organic working fluid changes from liquid to gas after absorbing heat in the first stage heat exchanger, and the unit is ℃.

[0103] The adiabatic index of natural gas, also known as the specific heat ratio, is an index of the change in the ratio of pressure to volume of natural gas in the adiabatic process, that is, the ratio of specific heat capacity at constant pressure to specific heat capacity at constant volume.

[0104] The compression ratio of each stage of the gas injection compressor refers to the pressure ratio of the gas in the compressor before and after it is compressed, that is, the ratio of the outlet pressure to the inlet pressure of the compressor. Among them, the compression ratio of the gas injection compressor can be found on the equipment nameplate of the gas injection compressor and is a fixed value.

[0105] The specific heat capacity of natural gas refers to the amount of heat required to raise the temperature of a unit mass of natural gas by 1 degree Celsius. It is usually divided into specific heat capacity at constant pressure and specific heat capacity at constant volume, and the unit is J / (kg·K).

[0106] The specific heat capacity of an organic working fluid refers to the amount of heat required to raise the temperature of a unit mass of the organic working fluid by 1 degree Celsius. It is also divided into specific heat capacity at constant pressure and specific heat capacity at constant volume, and its unit is J / (kg·K).

[0107] Specifically, the computing control system includes: a first temperature monitoring sensor 8, a flow monitoring sensor 9, a second temperature monitoring sensor 10 and a flow calculation device 11; the organic working fluid recycling system also includes: a control valve 12; the first temperature monitoring sensor 8 and the flow monitoring sensor 9 are both arranged at the air inlet end of the primary gas injection compressor 1, the second temperature monitoring sensor 10 and the control valve 12 are respectively arranged at the low-temperature medium input end of each first heat exchanger 2, the second temperature monitoring sensor 10 is arranged at one end close to the low-temperature medium input end of each first heat exchanger 2, and the control valve 12 is arranged at one end away from the low-temperature medium input end of each first heat exchanger 2; the first temperature monitoring sensor 8 is used to The temperature of the low-pressure natural gas is collected; the flow monitoring sensor 9 is used to collect the flow of the low-pressure natural gas; the second temperature monitoring sensor 10 is used to collect the temperature of the organic working fluid liquid at the inlet of each first heat exchanger; the flow calculation device 11 is also used to calculate the temperature of the low-pressure natural gas, the flow of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of each gas injection compressor, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid using the following formula to obtain the flow of the organic working fluid liquid corresponding to each first heat exchanger; Among them, m i represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, m represents the flow rate of the low-pressure natural gas, C p1 represents the preset specific heat capacity of natural gas, r i represents the preset compression ratio of the i-th stage gas injection compressor, γ represents the preset adiabatic index of natural gas, T represents the temperature of low-pressure natural gas, C p2 represents the preset specific heat capacity of the organic working fluid, t i,出 represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, t i,入Represents the temperature of the organic working fluid gas at the inlet of the i-th stage first heat exchanger; the flow calculation device 11 is also used to generate a valve opening adjustment instruction corresponding to each stage of the first heat exchanger based on the flow of the organic working fluid liquid corresponding to each stage of the first heat exchanger; the control valve 12 corresponding to each stage of the first heat exchanger 2 is used to adjust the opening of the control valve corresponding to each stage of the first heat exchanger when receiving the valve opening adjustment instruction corresponding to each stage of the first heat exchanger, so that the mass of the organic working fluid liquid flowing to each stage of the first heat exchanger meets the flow of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

[0108] For ease of understanding, the following example is given:

[0109] Assuming there are three gas injection compressors 1, there are also three first heat exchangers 2 and three control valves 12. The temperature of the natural gas monitored by the first temperature monitoring sensor 8 is 30°C, and the flow rate of the natural gas monitored by the flow monitoring sensor 9 is 1000m 3 / h, the second temperature monitoring sensor 10 detects that the temperature of the organic working fluid gas at the inlet of the first-stage heat exchanger is 40°C, the temperature of the organic working fluid gas at the outlet of the first-stage heat exchanger is 80°C, the temperature of the organic working fluid gas at the inlet of the second-stage heat exchanger is 70°C, the temperature of the organic working fluid gas at the outlet of the second-stage heat exchanger is 110°C, the temperature of the organic working fluid gas at the inlet of the third-stage heat exchanger is 100°C, the temperature of the organic working fluid gas at the outlet of the third-stage heat exchanger is 130°C, the adiabatic index of natural gas is 1.4, the compression ratio of the first gas injection compressor is 3, the compression ratio of the second gas injection compressor is 4, the compression ratio of the third gas injection compressor is 5, the specific heat capacity of natural gas is 2.1J / (kg·K), and the specific heat capacity of the organic working fluid is 1.5J / (kg·K).

[0110] The calculation process of the calculation device 11 is as follows:

[0111] The flow rate of organic working fluid required for heat exchange in the first heat exchanger of the first stage:

[0112] The flow rate of organic working fluid required for heat exchange in the first heat exchanger of the second stage:

[0113] The flow rate of organic working fluid required for heat exchange in the first heat exchanger of the third stage:

[0114] Then, based on the flow rate of the organic working fluid liquid required for heat exchange of the first-stage first heat exchanger, the flow rate of the organic working fluid liquid required for heat exchange of the second-stage first heat exchanger, and the flow rate of the organic working fluid liquid required for heat exchange of the third-stage first heat exchanger, a valve opening adjustment control instruction is generated, and then the valve opening adjustment control instruction is sent to the control valve corresponding to the first-stage first heat exchanger, the control valve corresponding to the second-stage first heat exchanger, and the control valve corresponding to the third-stage first heat exchanger, respectively, so as to adjust the control valve corresponding to the first-stage first heat exchanger, the control valve corresponding to the second-stage first heat exchanger, and the control valve corresponding to the third-stage first heat exchanger. The opening degree of the control valve corresponding to the first heat exchanger of the first stage will eventually make the flow rate of the organic working fluid liquid in the organic working fluid circulation pump 7 enter the first stage first heat exchanger, the second stage first heat exchanger and the third stage first heat exchanger respectively according to the flow rate of the organic working fluid liquid required for heat exchange by the first stage first heat exchanger, the flow rate of the organic working fluid liquid required for heat exchange by the second stage first heat exchanger and the flow rate of the organic working fluid liquid required for heat exchange by the third stage first heat exchanger, and then exchange heat with the compressed natural gas, so that the low-pressure natural gas can finally obtain the high-pressure natural gas we want after heat exchange.

[0115] Beneficial effects of the present invention:

[0116] (1) Improve energy efficiency: By recovering and utilizing the waste heat generated by the compressor during the gas injection process, the system can improve the energy efficiency of the entire gas storage facility.

[0117] (2) Reduce energy waste: Usually, a compressor generates a lot of heat when compressing gas. If this heat is not used, it will be wasted. This system can effectively utilize this part of heat and reduce energy waste.

[0118] (3) Power generation capacity: The organic working fluid circulation system can be used to convert the recovered heat energy into electrical energy, thereby providing additional power supply for gas storage or other facilities.

[0119] Embodiment 2

[0120] Based on the same inventive concept, Figure 2 As shown, the embodiment of the present invention further provides a method for controlling the utilization of waste heat from gas injection in a gas storage reservoir, which is implemented based on the above-mentioned system for utilizing waste heat from gas injection in a gas storage reservoir, and includes:

[0121] S100, performing multi-stage compression processing on low-pressure natural gas to obtain high-pressure natural gas;

[0122] S200, using the organic working fluid liquid prefabricated at different flow rates to perform heat exchange with the corresponding natural gas after each stage of compression treatment, to obtain organic working fluid gas after temperature increase at different flow rates;

[0123] S300, mixing the heated organic working fluid gases at different flow rates to obtain a mixed organic working fluid gas, and then performing heat exchange with formation water after the mixed organic working fluid gas is expanded to generate power, to obtain a cooled organic working fluid liquid;

[0124] S400, the cooled organic working fluid liquid is split to obtain organic working fluid liquids of different flow rates, and the organic working fluid liquids prefabricated with different flow rates are returned to exchange heat with the corresponding natural gas after each stage of compression treatment to obtain organic working fluid gases of different flow rates after heating.

[0125] In one embodiment, step S300 specifically includes:

[0126] S310, performing gas-liquid separation on the mixed organic working fluid gas to obtain organic working fluid gas and organic working fluid liquid after gas-liquid separation;

[0127] S320, using the organic working fluid gas after gas-liquid separation to expand and generate power, and then perform heat exchange with formation water to obtain a cooled organic working fluid liquid;

[0128] S330, mixing the cooled organic working fluid liquid and the gas-liquid separated organic working fluid liquid and then diverting the mixture to obtain organic working fluid liquids with different flow rates.

[0129] In one embodiment, step S400 specifically includes:

[0130] When the gas storage is in full load condition, the cooled organic working fluid is diverted to obtain organic working fluids with different flow rates; or

[0131] When the gas storage is in peak load operation, the cooled organic working fluid liquid is stored.

[0132] In one embodiment, step S400 specifically further includes:

[0133] S410, collecting the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger;

[0134] S420, using the following formula, calculate the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each stage of the first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of each stage of the gas injection compressor, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid, and obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger; Among them, m i represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, m represents the flow rate of the low-pressure natural gas, C p1represents the preset specific heat capacity of natural gas, r i represents the preset compression ratio of the i-th stage gas injection compressor, γ represents the preset adiabatic index of natural gas, T represents the temperature of low-pressure natural gas, C p2 represents the preset specific heat capacity of the organic working fluid, t i,出 represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, t i,入 represents the temperature of the organic working fluid gas at the inlet of the first heat exchanger of the i-th stage;

[0135] S430, generating a valve opening adjustment instruction corresponding to each stage of the first heat exchanger based on the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger;

[0136] S440, the valve opening adjustment instruction corresponding to each stage of the first heat exchanger is sent to the control valve corresponding to each stage of the first heat exchanger to adjust the opening of the control valve corresponding to each stage of the first heat exchanger, so that the mass of the organic working fluid liquid flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

[0137] Beneficial effects of the present invention:

[0138] (1) Improve energy efficiency: By recovering and utilizing the waste heat generated by the compressor during the gas injection process, the system can improve the energy efficiency of the entire gas storage facility.

[0139] (2) Reduce energy waste: Usually, a compressor generates a lot of heat when compressing gas. If this heat is not used, it will be wasted. This system can effectively utilize this part of heat and reduce energy waste.

[0140] (3) Power generation capacity: The organic working fluid circulation system can be used to convert the recovered heat energy into electrical energy, thereby providing additional power supply for gas storage or other facilities.

[0141] Embodiment 3

[0142] Based on the same inventive concept, Figure 3 As shown, the embodiment of the present invention further provides a gas storage gas injection waste heat utilization control device 200, comprising:

[0143] The multi-stage compression module 210 is used to control the multi-stage gas injection compressor heat exchange system to perform multi-stage compression processing on the low-pressure natural gas to obtain high-pressure natural gas;

[0144] The multi-stage heat exchange module 220 is used to control the multi-stage gas injection compressor heat exchange system to use the organic working fluid liquid prefabricated at different flow rates to exchange heat with the corresponding natural gas after each stage of compression treatment, so as to obtain organic working fluid gas after different flow rates and temperature increase;

[0145] The power generation heat exchange module 230 is used to control the organic working fluid recycling system to mix the heated organic working fluid gases at different flow rates to obtain a mixed organic working fluid gas, and then use the mixed organic working fluid gas to expand and generate power to perform heat exchange with formation water to obtain a cooled organic working fluid liquid;

[0146] The flow splitting circulation module 240 is used to control the organic working fluid recycling system to split the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates, and return to call the multi-stage compression module.

[0147] It should be understood that the device corresponds to the above-mentioned gas storage gas injection waste heat utilization control method embodiment, and can execute the various steps involved in the above-mentioned method embodiment. The specific functions of the device can be found in the above description. To avoid repetition, the detailed description is appropriately omitted here. The device includes at least one software function module that can be stored in the memory in the form of software or firmware or solidified in the operating system (OS) of the device.

[0148] Embodiment 4

[0149] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, including: a processor and a memory, the memory storing machine-readable instructions executable by the processor, and the machine-readable instructions, when executed by the processor, execute the above-mentioned gas storage reservoir gas injection waste heat utilization control method.

[0150] In a typical configuration, an electronic device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0151] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0152] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0153] Embodiment 5

[0154] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium storing computer instructions. When the computer instructions are executed on a computer, the computer executes the above-mentioned gas storage gas injection waste heat utilization control method.

[0155] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0156] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0157] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0158] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0159] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0160] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0161] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0162] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A gas storage gas injection waste heat utilization system, characterized in that: include: A multi-stage gas injection compressor heat exchange system and an organic working fluid recycling system, wherein the heat exchange medium input end and the output end of the multi-stage gas injection compressor heat exchange system are simultaneously connected to the organic working fluid recycling system; The multi-stage gas injection compressor heat exchange system is used to perform multi-stage compression processing on low-pressure natural gas to obtain high-pressure natural gas; The multi-stage gas injection compressor heat exchange system is also used to use the organic working fluid liquid prefabricated at different flow rates to exchange heat with the corresponding natural gas after each stage of compression treatment, so as to obtain organic working fluid gas after different flow rates and temperature increase; The organic working fluid recycling system is used to mix the heated organic working fluid gases at different flow rates to obtain mixed organic working fluid gases, and then use the mixed organic working fluid gases to expand and generate power, and then exchange heat with formation water to obtain cooled organic working fluid liquids; The organic working fluid recycling system is also used to divert the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates.

2. The gas storage gas injection waste heat utilization system according to claim 1 is characterized in that: The organic working fluid recycling system is also used to perform gas-liquid separation on the mixed organic working fluid gas to obtain the organic working fluid gas and organic working fluid liquid after gas-liquid separation; The organic working fluid recycling system is also used to utilize the organic working fluid gas after gas-liquid separation to expand and generate power, and then exchange heat with formation water to obtain a cooled organic working fluid liquid; The organic working fluid recycling system is also used to divert the organic working fluid liquid after cooling and the organic working fluid liquid after gas-liquid separation after mixing to obtain organic working fluid liquids with different flow rates.

3. The gas storage gas injection waste heat utilization system according to claim 2 is characterized in that: The organic working fluid recycling system is used to divert the cooled organic working fluid to obtain organic working fluids of different flow rates when the gas storage is under full load. The organic working fluid recycling system is used to store the cooled organic working fluid liquid when the gas storage is in peak load regulation condition.

4. The gas storage gas injection waste heat utilization system according to claim 3 is characterized in that: The multi-stage gas injection compressor heat exchange system comprises: a plurality of gas injection compressors (1) and a corresponding plurality of first heat exchangers (2); the plurality of gas injection compressors (1) are connected in series via the plurality of first heat exchangers (2); the gas outlet of the primary gas injection compressor (1) is connected to the gas inlet of the next-stage gas injection compressor via the corresponding first heat exchanger (2); the gas inlet of the primary gas injection compressor (1) is connected to a natural gas pipeline network; the gas outlet of the final gas injection compressor (1) is connected to a geological reservoir; and the low-temperature medium output ends and the low-temperature medium input ends of the plurality of first heat exchangers (2) are simultaneously connected to an organic working fluid recycling system.

5. The gas storage gas injection waste heat utilization system according to claim 4 is characterized in that: The organic working fluid recycling system comprises: an expansion generator (4), a second heat exchanger (5) and an organic working fluid circulation pump (7); The output end of the organic working fluid circulation pump (7) is respectively connected to the low-temperature medium input ends of the plurality of first heat exchangers (2), the low-temperature medium output ends of the plurality of first heat exchangers (2) are respectively connected to the air inlet end of the expansion generator (4), the exhaust end of the expansion generator (4) is connected to the high-temperature medium output end of the second heat exchanger (5), the high-temperature medium output end of the second heat exchanger (5) is connected to the input end of the organic working fluid circulation pump (7), the low-temperature medium input end of the second heat exchanger (5) is connected to the formation water system, and the low-temperature medium output end of the second heat exchanger (5) is connected to the cooling tower.

6. The gas storage gas injection waste heat utilization system according to claim 5, characterized in that: The organic working fluid recycling system also includes: a liquid separation tank (3); The input end of the liquid separation tank (3) is respectively connected to the low-temperature medium output ends of the plurality of first heat exchangers (2), and the output end of the liquid separation tank (3) is connected to the air inlet end of the expansion generator (4).

7. The gas storage gas injection waste heat utilization system according to claim 5, characterized in that: The organic working fluid recycling system also includes: a buffer tank (6); The input end of the buffer is in communication with the low-temperature medium output end of the second heat exchanger (5), and the output end of the buffer is in communication with the input end of the organic working medium circulation pump (7).

8. The gas storage gas injection waste heat utilization system according to claim 4, characterized in that: Also includes: Computational control systems; The computing control system is used to collect the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas and the temperature of the organic working fluid liquid at the inlet of each first heat exchanger; The computing control system is also used to obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger based on the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each stage of the first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of the gas injection compressor of each stage, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid liquid; The organic working fluid recycling system is also used to control the flow rate of the organic working fluid liquid flowing to each stage of the first heat exchanger to meet the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

9. The gas storage gas injection waste heat utilization system according to claim 8, characterized in that: The computing control system comprises: a first temperature monitoring sensor (8), a flow monitoring sensor (9), a second temperature monitoring sensor (10) and a flow calculation device (11); the organic working fluid recycling system further comprises: a control valve (12); The first temperature monitoring sensor (8) and the flow monitoring sensor (9) are both arranged at the air inlet end of the primary air injection compressor (1), the second temperature monitoring sensor (10) and the control valve (12) are respectively arranged at the low-temperature medium input end of each first heat exchanger (2), the second temperature monitoring sensor (10) is arranged at an end close to the low-temperature medium input end of each first heat exchanger (2), and the control valve (12) is arranged at an end far from the low-temperature medium input end of each first heat exchanger (2); The first temperature monitoring sensor (8) is used to collect the temperature of the low-pressure natural gas; The flow monitoring sensor (9) is used to collect the flow of low-pressure natural gas; The second temperature monitoring sensor (10) is used to collect the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger; The flow calculation device (11) is also used to calculate the temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of each gas injection compressor, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid using the following formula to obtain the flow rate of the organic working fluid liquid corresponding to each first heat exchanger; Among them, m i represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, m represents the flow rate of the low-pressure natural gas, C p1 represents the preset specific heat capacity of natural gas, r i represents the preset compression ratio of the i-th stage gas injection compressor, γ represents the preset adiabatic index of natural gas, T represents the temperature of low-pressure natural gas, C p2 represents the preset specific heat capacity of the organic working fluid, t i,出 represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, t i,入 represents the temperature of the organic working fluid gas at the inlet of the first heat exchanger of the i-th stage; The flow calculation device (11) is also used to generate a valve opening adjustment instruction corresponding to each stage of the first heat exchanger based on the flow of the organic working fluid liquid corresponding to each stage of the first heat exchanger; The control valve (12) corresponding to each stage of the first heat exchanger (2) is used to adjust the opening of the control valve corresponding to each stage of the first heat exchanger when receiving a valve opening adjustment instruction corresponding to each stage of the first heat exchanger, so that the mass of the organic working fluid liquid flowing to each stage of the first heat exchanger satisfies the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the organic working fluid liquid after the temperature is reduced.

10. The gas storage gas injection waste heat utilization system according to claim 9, characterized in that: The number of the gas injection compressor (1), the first heat exchanger (2) and the control valve (12) are all three.

11. The gas storage gas injection waste heat utilization system according to claim 5, characterized in that: The first heat exchanger (2) and the second heat exchanger (5) are both plate-type heat exchangers.

12. The gas storage gas injection waste heat utilization system according to claim 4, characterized in that: The gas injection compressor (1) is a reciprocating gas injection compressor.

13. The gas storage gas injection waste heat utilization system according to claim 1, characterized in that: The organic working fluid is any one of propane, isobutane and propylene.

14. A method for controlling the utilization of waste heat from gas injection in a gas storage facility, characterized in that: The gas storage gas injection waste heat utilization system according to any one of claims 1 to 13 is implemented, comprising: Perform multi-stage compression on low-pressure natural gas to obtain high-pressure natural gas; The organic working fluid liquid prefabricated at different flow rates is used to exchange heat with the corresponding natural gas after each stage of compression treatment to obtain organic working fluid gas after different flow rates and temperature increases; The organic working fluid gases heated at different flow rates are mixed to obtain a mixed organic working fluid gas, and the mixed organic working fluid gas is expanded to generate power and then heat is exchanged with formation water to obtain a cooled organic working fluid liquid; The cooled organic working fluid liquid is split to obtain organic working fluid liquids of different flow rates, and the organic working fluid liquids prefabricated with different flow rates are returned to exchange heat with the corresponding natural gas after each stage of compression treatment to obtain organic working fluid gases of different flow rates after heating.

15. The method for controlling utilization of waste heat from gas injection in a gas storage facility according to claim 14, characterized in that: The mixed organic working fluid gas is expanded to generate electricity and then heat is exchanged with formation water to obtain a cooled organic working fluid liquid, including: Performing gas-liquid separation on the mixed organic working fluid gas to obtain gas-liquid separated organic working fluid gas and organic working fluid liquid; The organic working fluid gas after gas-liquid separation is expanded to generate power and then heat is exchanged with formation water to obtain a cooled organic working fluid liquid; The organic working fluid liquid after cooling and the organic working fluid liquid after gas-liquid separation are mixed and then diverted to obtain organic working fluid liquids with different flow rates.

16. The method for controlling utilization of waste heat from gas injection in a gas storage facility according to claim 14, characterized in that: The cooled organic working fluid is divided to obtain organic working fluids with different flow rates, including: When the gas storage is in full load condition, the cooled organic working fluid is split to obtain organic working fluids with different flow rates; or When the gas storage is in peak load operation, the cooled organic working fluid liquid is stored.

17. The method for controlling utilization of waste heat from gas injection in a gas storage facility according to claim 14, characterized in that: The cooled organic working fluid is divided to obtain organic working fluids of different qualities, including: Collecting the temperature of the organic working fluid liquid at the inlet of the first heat exchanger of each stage; The temperature of the low-pressure natural gas, the flow rate of the low-pressure natural gas, the temperature of the organic working fluid liquid at the inlet of each stage of the first heat exchanger, the preset temperature of the organic working fluid gas at the outlet of each stage of the first heat exchanger, the preset adiabatic index of the natural gas, the preset compression ratio of each stage of the gas injection compressor, the preset specific heat capacity of the natural gas and the preset specific heat capacity of the organic working fluid are calculated using the following formula to obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger; Among them, m i represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, m represents the flow rate of the low-pressure natural gas, C p1 represents the preset specific heat capacity of natural gas, r i represents the preset compression ratio of the i-th stage gas injection compressor, γ represents the preset adiabatic index of natural gas, T represents the temperature of low-pressure natural gas, C p2 represents the preset specific heat capacity of the organic working fluid, t i,出 represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, t i,入 represents the temperature of the organic working fluid gas at the inlet of the first heat exchanger of the i-th stage; Based on the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, a valve opening adjustment instruction corresponding to each stage of the first heat exchanger is generated; The valve opening adjustment instruction corresponding to each stage of the first heat exchanger is sent to the control valve corresponding to each stage of the first heat exchanger to adjust the opening of the control valve corresponding to each stage of the first heat exchanger, so that the mass of the organic working fluid liquid flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

18. A gas storage gas injection waste heat utilization control device, characterized in that: include: The multi-stage compression module is used to control the multi-stage gas injection compressor heat exchange system to perform multi-stage compression processing on low-pressure natural gas to obtain high-pressure natural gas; The multi-stage heat exchange module is used to control the multi-stage gas injection compressor heat exchange system to use the prefabricated organic working fluid liquid with different flow rates to exchange heat with the corresponding natural gas after each stage of compression treatment, so as to obtain the organic working fluid gas with different flow rates and temperature rise; The power generation heat exchange module is used to control the organic working fluid recycling system to mix the heated organic working fluid gases at different flow rates to obtain mixed organic working fluid gases, and then use the mixed organic working fluid gases to expand and generate power to exchange heat with formation water to obtain cooled organic working fluid liquids; The diversion circulation module is used to control the organic working fluid recycling system to divert the cooled organic working fluid liquid to obtain organic working fluid liquids with different flow rates, and return to call the multi-stage compression module.

19. An electronic device, characterized in that: include: A processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the machine-readable instructions are executed by the processor, the gas storage reservoir gas injection waste heat utilization control method described in any one of claims 14-17 is executed.

20. A computer-readable storage medium storing computer instructions, characterized in that: When the computer instructions are executed on a computer, the computer executes the method for controlling utilization of waste heat from gas injection in a gas storage facility according to any one of claims 14 to 17.

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