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

Abstract

The present invention provides a system, method, device, equipment, and medium for utilizing waste heat from gas injection in a gas storage facility, belonging to the field of oil and gas field surface engineering technology. The system comprises: a multi-stage gas injection compressor heat exchange system and an organic working fluid recycling system; the multi-stage gas injection compressor heat exchange system compresses natural gas in multiple stages and exchanges heat with organic working fluid liquids of varying flow rates to recover waste heat from the natural gas; the organic working fluid recycling system utilizes the heated organic working fluid gas to expand and generate power, then exchanges heat with formation water to cool it down, obtaining a cooled organic working fluid liquid that is then recycled. By recovering compressor waste heat and converting it into electrical energy, the present invention significantly improves the energy utilization efficiency of the gas storage facility and reduces energy waste, while also providing an additional power supply.

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] Amidst global trends in energy transition and environmental protection, natural gas, as a clean and efficient energy source, is increasingly used in my country's energy mix. Underground gas storage, as crucial natural gas storage and peak-shaving facilities, plays an irreplaceable role in ensuring national energy security and a stable gas supply. During underground gas storage operations, particularly during the injection phase, natural gas requires multiple stages of compression to increase pressure for storage.

[0003] Currently, compressed natural gas is primarily cooled through natural gas compression and cooling technology before being stored in gas storage facilities. Specifically, the process involves the following steps: low-pressure natural gas undergoes a first-stage compression process, raising its temperature from 10°C to 60°C, before being cooled to below 40°C in an air cooler. The natural gas then undergoes a second-stage compression process, raising its temperature to 80°C, before being cooled again in an air cooler. Finally, the natural gas undergoes a third-stage compression process, raising its temperature to above 95°C, before finally being cooled to below 50°C in an air cooler before entering the gas storage facility.

[0004] However, the existing natural gas compression and cooling technology cannot recover the waste heat generated during the compression process by the air cooler, 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] To achieve the above objectives, 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 and output ends of the multi-stage gas injection compressor heat exchange system are simultaneously connected to the organic working fluid recycling system;

[0007] Multi-stage gas injection compressor heat exchange system, 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 prefabricated organic working fluid liquid at different flow rates to exchange heat with the corresponding natural gas after compression treatment at each stage, thereby obtaining organic working fluid gas at different flow rates and temperatures.

[0009] The organic working fluid recycling system is used to mix 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, and then exchange heat with formation water to obtain a cooled organic working fluid liquid.

[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 gas-liquid separated organic working fluid gas and organic working fluid liquid;

[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 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 to obtain organic working fluids of different flow rates when the gas storage is in full load condition;

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

[0016] Optionally, the multi-stage air injection compressor heat exchange system includes: multiple air injection compressors and corresponding multiple first heat exchangers, multiple air injection compressors are connected in series through multiple first heat exchangers, the air outlet end of the primary air injection compressor is connected to the air inlet end of the next stage air injection compressor through the corresponding first heat exchanger, the air inlet end of the primary air injection compressor is connected to the natural gas pipeline network, the air outlet end of the final stage air 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 includes: 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 end of multiple first heat exchangers, the low-temperature medium output ends of multiple first heat exchangers are respectively connected to the air inlet end 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 further includes: a computing control system;

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

[0025] The computing and control system is further configured 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 flowing to each stage of the first heat exchanger to meet the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid.

[0027] Optionally, the computing and 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, and 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 an end close to the low-temperature medium input end of each first heat exchanger, and the control valve is arranged at an end 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 at the inlet of each stage of the first heat exchanger;

[0032] The flow calculation device is further configured to calculate the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger using the following formula: 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;

[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 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 Indicates 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 further 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 flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid.

[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 reservoir is provided, which is implemented based on the above-mentioned gas storage reservoir waste heat utilization system and includes:

[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 with different flow rates and temperature increases;

[0043] Mixing heated organic working fluid gases at different flow rates to obtain mixed organic working fluid gas, and then using the mixed organic working fluid gas to expand and generate power, exchanging heat with formation water to obtain 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 for heat exchange with the corresponding natural gas after each stage of compression treatment to obtain heated organic working fluid gases of different flow rates.

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

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

[0049] Optionally, the cooled organic working fluid is split to obtain organic working fluids 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 regulation mode, the cooled organic working fluid is stored.

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

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

[0054] The flow rate of the organic working fluid corresponding to each stage of the first heat exchanger is calculated using the following formula: 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;

[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 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 Indicates 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] Generate 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;

[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 flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid.

[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 exchange heat with the organic working fluid liquid pre-made at different flow rates and the corresponding natural gas after compression treatment at each stage, thereby obtaining organic working fluid gas at different flow rates and temperatures;

[0061] The power generation and 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 a mixed organic working fluid gas. After the mixed organic working fluid gas is expanded to generate power, it is heat-exchanged with formation water to obtain a cooled organic working fluid liquid.

[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 them 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 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, which stores computer instructions. When the computer instructions are executed on a computer, the computer executes the above-mentioned gas storage 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 recovered heat energy into electrical energy, thereby providing additional power supply for gas storage facilities 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 detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

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

[0072] Figure 2 1 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 reservoir gas injection waste heat utilization control device provided by 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 following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein 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 those skilled in the art 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 this application, the technical terms "first," "second," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0082] Example 1

[0083] Please refer to Figure 1 , Figure 1This is a structural schematic diagram of a gas storage injection waste heat utilization system provided by an embodiment of the present invention, which includes: a multi-stage gas injection compressor heat exchange system and an organic working fluid recycling system, wherein the heat exchange medium input and output ends 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 three. In this embodiment, by providing multiple devices, 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, plate heat exchangers are used to improve heat exchange efficiency and save space because they are generally high-efficiency, small-sized, and easy to clean.

[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 multiple first heat exchangers 2, the low-temperature medium output ends of 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 medium recycling system further includes: a separator 3 ; the input end of the 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 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 of different flow rates when the gas storage reservoir is in a full-load operating 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-shaving operating condition.

[0095] A gas storage facility is at full capacity when its storage capacity has reached its designed maximum and there is no more room to store additional natural gas. In this case, the facility cannot accept any more natural gas injections 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 mode adjusts the injection and extraction of natural gas based on market demand fluctuations to meet peak demand. During peak-shaving mode, the focus of gas storage operations is to balance natural gas supply and demand, ensuring sufficient natural gas supply during peak demand periods (such as winter or specific time 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 and control system; the computing and 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 and 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 low-pressure natural gas, the flow rate of 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 natural gas, the preset compression ratio of each stage of gas injection compressor, the preset specific heat capacity of 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 the first heat exchanger of each stage 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 during 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 a gas injection compressor refers to the pressure ratio of the gas before and after compression, that is, the ratio of the compressor's outlet pressure to its inlet pressure. The compression ratio of a gas injection compressor is a fixed value and can be found on the compressor's nameplate.

[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 and 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 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 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 further 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 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 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 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 Indicates 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 first heat exchanger based on the flow of the organic working fluid liquid corresponding to each first heat exchanger; the control valve 12 corresponding to each first heat exchanger 2 is used to adjust the opening of the control valve corresponding to each first heat exchanger when receiving the valve opening adjustment instruction corresponding to each first heat exchanger, so that the mass of the organic working fluid flowing to each first heat exchanger meets the flow of the organic working fluid liquid corresponding to each first heat exchanger, so as to realize the diversion of the cooled organic working fluid liquid.

[0108] For easier understanding, the following examples are 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, and 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, and 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 heat exchanger of the first stage, the first heat exchanger of the second stage and the first heat exchanger of the third stage respectively according to the flow rate of the organic working fluid liquid required for heat exchange in the first heat exchanger of the first stage, the flow rate of the organic working fluid liquid required for heat exchange in the second stage and the flow rate of the organic working fluid liquid required for heat exchange in the third stage, 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 recovered heat energy into electrical energy, thereby providing additional power supply for gas storage facilities or other facilities.

[0119] Example 2

[0120] Based on the same inventive concept, Figure 2 As shown, an embodiment of the present invention further provides a method for controlling 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, heat exchange is performed between the organic working fluid liquid prefabricated at different flow rates and the corresponding natural gas after compression treatment at each stage, thereby obtaining organic working fluid gas at different flow rates and temperatures;

[0123] S300, 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, exchanging heat with formation water to obtain a cooled organic working fluid liquid;

[0124] S400 is a step of splitting the cooled organic working fluid liquid to obtain organic working fluid liquids of different flow rates, and returning the organic working fluid liquids prefabricated with different flow rates to exchange heat with the corresponding natural gas after each stage of compression treatment to obtain heated organic working fluid gases of different flow rates.

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

[0126] S310, 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;

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

[0128] S330 , mixing the cooled organic working fluid and the gas-liquid separated organic working fluid and then diverting the mixture to obtain organic working fluids 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 regulation mode, the cooled organic working fluid is stored.

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

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

[0134] S420: Using the following formula, calculate the flow rate of the organic working fluid 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, to obtain the flow rate of the organic working fluid liquid corresponding to each stage of the first heat exchanger; Among them, m irepresents 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 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 Indicates 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 flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger, thereby realizing the diversion of the cooled organic working fluid.

[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 recovered heat energy into electrical energy, thereby providing additional power supply for gas storage facilities or other facilities.

[0141] Example 3

[0142] Based on the same inventive concept, Figure 3 As shown, an 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 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 prefabricated organic working fluid at different flow rates to exchange heat with the corresponding natural gas after compression treatment at each stage, thereby obtaining organic working fluid gas at different flow rates and temperatures;

[0145] The power generation and 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. After the mixed organic working fluid gas is expanded to generate power, it is heat-exchanged with formation water to obtain a cooled organic working fluid liquid.

[0146] The diversion circulation module 240 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 them to call the multi-stage compression module.

[0147] It should be understood that this device corresponds to the aforementioned embodiment of the method for controlling waste heat utilization during gas injection in a gas storage facility and is capable of executing each of the steps involved in the aforementioned method embodiment. The specific functions of this device can be found in the description above; to avoid repetition, a detailed description is omitted here. The device includes at least one software functional module that can be stored in a memory in the form of software or firmware or embedded in the device's operating system (OS).

[0148] Example 4

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

[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 includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The 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 disc read-only memory (CD-ROM), digital versatile disc (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 transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0153] Example 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 injection waste heat utilization control method.

[0155] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can 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 can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic 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 produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. 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 that can direct a computer or other programmable data processing device to work 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 The 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 operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function 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 appropriate 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 independently, or two or more modules can be integrated to form an independent part.

[0161] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0162] The above are merely 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 modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all 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; Multi-stage gas injection compressor heat exchange system, 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 prefabricated organic working fluid liquid at different flow rates to exchange heat with the corresponding natural gas after compression treatment at each stage, thereby obtaining organic working fluid gas at different flow rates and temperatures. The organic working fluid recycling system is used to mix 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, 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 cooled organic working fluid to obtain organic working fluids with different flow rates. The multi-stage air injection compressor heat exchange system comprises: a plurality of air injection compressors (1) and corresponding plurality of first heat exchangers (2), the plurality of air injection compressors (1) are connected in series through the plurality of first heat exchangers (2), the air outlet of the primary air injection compressor (1) is connected to the air inlet of the next stage air injection compressor through the corresponding first heat exchanger (2), the air inlet of the primary air injection compressor (1) is connected to a natural gas pipeline network, the air outlet of the final stage air 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; The gas storage reservoir gas injection waste heat utilization system further includes: a calculation control system; the calculation 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 further 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 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 away 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 further 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 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 using the following formula to obtain the flow rate of the organic working fluid liquid corresponding to each first heat exchanger; ； in, represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, Indicates the flow rate of low-pressure natural gas, Indicates the preset specific heat capacity of natural gas, represents the preset compression ratio of the i-th stage gas injection compressor, Indicates the preset adiabatic index of natural gas, Indicates the temperature of low-pressure natural gas, Indicates the preset specific heat capacity of the organic working fluid, represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, 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 further 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 flowing to each stage of the first heat exchanger satisfies the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger, thereby realizing the diversion of the cooled organic working fluid.

2. The gas storage gas injection waste heat utilization system according to claim 1, characterized in that: The organic working medium recycling system is also used to perform gas-liquid separation on the mixed organic working medium gas to obtain the organic working medium gas and organic working medium 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 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, 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 in full load condition. The organic working fluid recycling system is used to store 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 1, 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 medium 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 medium 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.

5. The gas storage gas injection waste heat utilization system according to claim 4, characterized in that: The organic working fluid recycling system further 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).

6. The gas storage gas injection waste heat utilization system according to claim 4, characterized in that: The organic working fluid recycling system further includes: a buffer tank (6); The input end of the buffer tank (6) is communicated with the low-temperature medium output end of the second heat exchanger (5), and the output end of the buffer tank (6) is communicated with the input end of the organic working medium circulation pump (7).

7. The gas storage gas injection waste heat utilization system according to claim 1, characterized in that: The computing and control system is used to collect the temperature and flow rate of the low-pressure natural gas and the temperature of the organic working fluid liquid at the inlet of the first heat exchanger of each stage; The computing and control system is further configured 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 flowing to each stage of the first heat exchanger to meet the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid.

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

9. The gas storage gas injection waste heat utilization system according to claim 4, characterized in that: The first heat exchanger (2) and the second heat exchanger (5) are both plate-type heat exchangers.

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

11. 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.

12. 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 11 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 with different flow rates and temperature increases; Mixing heated organic working fluid gases at different flow rates to obtain mixed organic working fluid gas, and then using the mixed organic working fluid gas to expand and generate power, exchanging heat with formation water to obtain 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 for heat exchange with the corresponding natural gas after each stage of compression treatment to obtain heated organic working fluid gases of different flow rates.

13. The method for controlling utilization of waste heat from gas injection in a gas storage facility according to claim 12, characterized in that: The mixed organic working fluid gas is expanded to generate electricity and then heat 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 exchanged with formation water to obtain a cooled organic working fluid liquid; The cooled organic working fluid liquid and the gas-liquid separated organic working fluid liquid are mixed and then diverted to obtain organic working fluid liquids with different flow rates.

14. The method for controlling utilization of waste heat from gas injection in a gas storage facility according to claim 12, characterized in that: The cooled organic working fluid is split 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 diverted to obtain organic working fluids with different flow rates; or When the gas storage is in peak load regulation mode, the cooled organic working fluid is stored.

15. The method for controlling utilization of waste heat from gas injection in a gas storage facility according to claim 12, characterized in that: The cooled organic working fluid is divided to obtain organic working fluids of different qualities, including: Collect the temperature of the organic working fluid at the inlet of the first heat exchanger of each stage; The flow rate of the organic working fluid corresponding to each stage of the first heat exchanger is calculated using the following formula: 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; ； in, represents the flow rate of the organic working fluid corresponding to the first heat exchanger of the i-th stage, Indicates the flow rate of low-pressure natural gas, Indicates the preset specific heat capacity of natural gas, represents the preset compression ratio of the i-th stage gas injection compressor, Indicates the preset adiabatic index of natural gas, Indicates the temperature of low-pressure natural gas, Indicates the preset specific heat capacity of the organic working fluid, represents the preset temperature of the organic working fluid gas at the outlet of the first heat exchanger of the i-th stage, represents the temperature of the organic working fluid gas at the inlet of the first heat exchanger of the i-th stage; Generate 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; 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 flowing to each stage of the first heat exchanger meets the flow rate of the organic working fluid corresponding to each stage of the first heat exchanger, so as to realize the diversion of the cooled organic working fluid.

16. A gas storage gas injection waste heat utilization control device, applied to the gas storage gas injection waste heat utilization control method according to any one of claims 12 to 15, 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 exchange heat with the organic working fluid liquid pre-made at different flow rates and the corresponding natural gas after compression treatment at each stage, thereby obtaining organic working fluid gas at different flow rates and temperatures; The power generation and 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 a mixed organic working fluid gas. After the mixed organic working fluid gas is expanded to generate power, it is heat-exchanged with formation water to obtain a cooled organic working fluid liquid. 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 them to call the multi-stage compression module.

17. 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 according to any one of claims 12 to 15 is executed.

18. A computer-readable storage medium storing computer instructions, characterized in that: When the computer instructions are executed on a computer, the computer is enabled to execute the gas storage gas injection waste heat utilization control method according to any one of claims 12 to 15.

Images