Design method of mine compressed air energy storage system

Abstract

The present invention provides a design method for a mine compressed air energy storage system, which relates to the field of energy storage technology. The design method includes: numbering the n mines of the mine gas storage reservoir in order from the surface downward; determining the peak power duration t1, the flat power duration t2, and the valley power duration t3 under the peak-valley arbitrage operation scenario of the mine compressed air energy storage system; analyzing and measuring the maximum bearing capacity P1 of the stratum surrounding rock at the top of the No. 1 mine and the bearing capacity of the stratum surrounding rock between adjacent mines, and screening out the minimum bearing capacity dP; calculating the changes in mine pressure and temperature during the compressed gas injection process, and designing the parameters of the compression subsystem; calculating the changes in mine pressure and temperature during the gas storage process; calculating the changes in mine pressure and temperature during the turbine gas release process, and designing the parameters of the turbine subsystem. This design method can reasonably design the parameters of the compressed air energy storage system and improve the energy storage density and power generation efficiency of the compressed air energy storage system.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a design method for a mine compressed air energy storage system. Background Art

[0002] Compressed air energy storage, as a large-scale clean physical energy storage technology, is one of the key development directions of new energy storage. How to improve the energy storage density and power generation efficiency of compressed air energy storage systems is the key to the promotion and application of compressed air energy storage technology.

[0003] Therefore, how to reasonably design the parameters of the compressed air energy storage system and improve the energy storage density and power generation efficiency of the compressed air energy storage system is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The purpose of the present invention includes providing a design method for a mine compressed air energy storage system, which can reasonably design the parameters of the compressed air energy storage system and improve the energy storage density and power generation efficiency of the compressed air energy storage system.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] The present invention provides a design method for a mine compressed air energy storage system, the design method comprising:

[0007] S1: Count the number of mine caves n in the mine gas storage, and number the mine caves in order from the surface downwards;

[0008] S2: Determine the peak, flat, and valley time periods of the power system where the mine compressed air energy storage system is located, and determine the peak power duration t1, flat power duration t2, and valley power duration t3 under the peak-valley arbitrage operation scenario of the mine compressed air energy storage system;

[0009] S3: Analyze and measure the maximum bearing capacity P1 of the surrounding rock formation at the top of the No. 1 mine and the bearing capacity of the surrounding rock formation between adjacent mines, and screen out the minimum bearing capacity dP;

[0010] S4: Calculate the changes in mine pressure and temperature during compressed gas injection and design the compression subsystem parameters;

[0011] S5: Calculate the changes in mine pressure and temperature during gas storage;

[0012] S6: Calculate the changes in mine pressure and temperature during turbine degassing and design the turbine subsystem parameters.

[0013] The beneficial effects of the mine compressed air energy storage system design method provided by the embodiment of the present invention include:

[0014] The core of this design method is to determine the design parameters of the compression system and the turbine system based on the pressure and temperature changes of the mine during cascade gas storage and cascade. This method not only fully incorporates the thermodynamic characteristics of the mine during the gas storage and release process, but also makes good use of the peak, flat and valley power periods of the power system in typical operating scenarios to achieve the rationality of the design parameters of the compressed air energy storage system. This can improve the energy storage density and power generation efficiency of the compressed air energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A flow chart of a method for designing a mine compressed air energy storage system according to an embodiment of the present invention;

[0017] Figure 2 This is a structural diagram of a mine gas storage facility;

[0018] Figure 3 Design process for parameters of compression subsystem;

[0019] Figure 4 Parameter design process for turbine subsystem.

[0020] Icon: 1-Mine No. 1; 2-Mine No. 2; 3-Mine No. 3; 4-Mine No. 4; 5-Mine No. 5. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0026] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0027] Please refer to Figure 1 This embodiment provides a design method for a compressed air energy storage system in a mine. For ease of distinction, the process of using a compressor to compress air to a high-pressure state and then injecting it into the mine is referred to as the gas injection process, the process of turbine power generation in the compressed air energy storage system is referred to as the gas release process, and the process between compressed gas storage and turbine gas release in the compressed air energy storage system is referred to as the gas storage process.

[0028] The overall design process of the mine compressed air energy storage system design method includes the following steps:

[0029] S1: Count the number of mine caves n in the mine gas storage, and number the mine caves in order from the surface downwards.

[0030] Specifically, in this embodiment, the design method is based on Figure 2 The mine gas storage shown in the figure is used as an example to illustrate. Figure 2 It can be seen that the mine gas storage in this embodiment includes 5 horizontal mines, that is, the number of mines n = 5, and each mine gas storage is vertically distributed from top to bottom along the surface, from top to bottom, they are mine No. 1 1, mine No. 2 2, mine No. 3 3, mine No. 4 4 and mine No. 5 5.

[0031] S2: Determine the peak, flat and valley time periods of the power system where the mine compressed air energy storage system is located, and determine the peak power duration t1, flat power duration t2 and valley power duration t3 under the peak-valley arbitrage operation scenario of the mine compressed air energy storage system.

[0032] S3: Analyze and measure the maximum bearing capacity P1 of the stratum surrounding rock at the top of No. 1 mine hole 1 and the bearing capacity of the stratum surrounding rock between adjacent mine holes, and screen out the minimum bearing capacity dP.

[0033] Specifically, for example, the maximum bearing capacity of the surrounding rock between Mine No. 1 and Mine No. 2 is dP1; the maximum bearing capacity of the surrounding rock between Mine No. 2 and Mine No. 3 is dP2; the maximum bearing capacity of the surrounding rock between Mine No. 3 and Mine No. 4 is dP3; and the maximum bearing capacity of the surrounding rock between Mine No. 4 and Mine No. 5 is dP4. Compare the bearing capacities of different mines and select the minimum bearing capacity as dP.

[0034] S4: Calculate the changes in mine pressure and temperature during compressed gas injection and design the compression subsystem parameters.

[0035] Specifically, this stage mainly determines the number of stages of the compression subsystem, the pressure ratio of each stage, the rated mass flow rate, and the temperature and pressure values ​​of each mine after the gas storage stage. Figure 3 ,The parameter design process of the compression subsystem includes the following steps:

[0036] S41: Determine the number of compressor stages N in the compression subsystem c =n, the gas storage pressure of the nth mine is P1+(n-1)dP.

[0037] Specifically, to increase the system's energy storage density, a cascaded pressurization method is used to fully utilize the pressure-bearing capacity of the surrounding rock between connected mines, increasing the energy and gas storage pressure in each mine. The maximum gas storage pressure of Mine No. 1 is determined to be P1; the maximum gas storage pressure of Mine No. 2 is P1+dP; the maximum gas storage pressure of Mine No. 3 is P1+2dP; and the gas storage pressure of Mine No. n is P1+(n-1)dP.

[0038] S42: Assume that the initial gas storage pressure of the mine is P t , then the compression ratio of the first-stage compressor is P1 / P0; the compression ratio of the n-th-stage compressor is [P1+(n-1)dP] / [P1+(n-2)dP], where n≥2.

[0039] Specifically, assuming that the initial gas storage pressure of the mine is P t , the compression ratio of the first-stage compressor is P1 / P0; the compression ratio of the second-stage compressor is (P1+dP) / P1; the compression ratio of the third-stage compressor is (P1+2dP) / (P1+dP); the compression ratio of the n-stage compressor is [P1+(n-1)dP] / [P1+(n-2)dP].

[0040] S43: Assume that the rated intake mass flow rate of the compressor is Q c .

[0041] S44: Starting from i=1, traverse each step-down gas storage stage; when i=1, the compression stage takes time t c =0.

[0042] S451: Determine the mine number of the compressed gas injection process in the current i-th gas injection stage: i~n; the gas injection mass flow rate m of each mine at this time c =Q c / (n-i+1), calculate t max Pressure and temperature changes in each mine cavern involved in the compressed gas injection process during the time period.

[0043] The number of compressor stages to be put into operation is determined as follows: 1 to i; the following formulas (1) to (3) are used to calculate ts with the time step length ts as the step value. max During the time period, the pressure and temperature changes of each mine involved in the compression gas injection process, t max A sufficiently large value should be chosen.

[0044]

[0045] Among them, ρ cav,0 is the density of air in the mine at the time of initial gas injection; ρ cav (t max ) is the gas injection t max The density of the air in the mine at the moment; m c is the current gas injection mass flow rate of the mine; M0 is the air mass of the mine at the initial moment; t max is the gas injection time; ρ cav (t max ) is the air density in the mine after gas injection time t.

[0046]

[0047] Among them, T cav,0 is the temperature of the air in the mine at the time of initial gas injection; h is the convection heat transfer coefficient between the air in the mine and the wall; A cav Mine surface area; T t,c is the air injection temperature; T w is the mine wall temperature; c v is the specific heat capacity of air at constant volume; T cav (t max ) is the air density in the mine after gas injection time t.

[0048] P cav (t max )=ρ cav (t max )R g Tcav (t max ) (3)

[0049] Among them, P cav (t) is the air pressure in the mine after the gas injection time t; R g is the gas constant of air.

[0050] S452: Determine the number of the mines in the gas storage process in the current stage i: 1 to (i-1); when i=1, no mine is involved in the gas storage process; calculate t max Changes in pressure and temperature of each mine cave involved in the gas storage process during the time period.

[0051] Specifically, let m c =0; Calculate t using formula (1) to formula (3) max Changes in pressure and temperature of each mine cave involved in the gas storage process during the time period.

[0052] S46: In t max Find the time t when the pressure of the i-n mine reaches P1+(n-1)dP for the first time during the time period i , record t i The pressure and temperature changes in mines 1 to n during the time period.

[0053] S47: Determine t i Whether the pressure difference between adjacent mines is greater than dP within the time period.

[0054] If yes, return to S43 and adjust the rated intake air mass flow rate of the compressor to Q c , re-iterate the calculation;

[0055] If not, proceed to S48.

[0056] S48: Determine t c Is it greater than t1? Among them, t c =t c +t i Superimposes and calculates the current compression time.

[0057] If yes, return to S43, adjust the rated intake air mass flow rate of the compressor to Qc, and perform iterative calculation again;

[0058] If not, proceed to S49.

[0059] S49: Determine whether i is n.

[0060] If not, proceed to S491.

[0061] S491: Record t iThe pressure and temperature of the mine holes No. 1 to No. n at time are used as the initial parameters of the gas injection stage i=i+1, and the process returns to S44.

[0062] If so, proceed to S492.

[0063] S492: The gas injection phase ends and t is recorded. i The pressure and temperature of the mine holes 1 to n at time t1 are used as the initial parameters of the gas storage stage. In addition, the number of compressor stages and the pressure ratio of each stage, the rated mass flow rate Q of the compressor can also be recorded. c .

[0064] S5: Calculate the changes in mine pressure and temperature during gas storage.

[0065] Specifically, this stage mainly calculates the temperature and pressure values ​​of each mine after the gas storage is completed.

[0066] In the gas storage stage, the No. 1 to No. n mines are in the gas storage process, and the specific gas storage time is t1-t c +t2; let m c =0; use formula (1) to formula (3) to calculate t1-t c During the +t2 period, the pressure and temperature changes of each mine cave involved in the gas storage process; the temperature and pressure of each mine cave after the gas storage stage are recorded as the initial values ​​of the turbine power generation and gas release process in the next stage.

[0067] S6: Calculate the changes in mine pressure and temperature during turbine degassing and design the turbine subsystem parameters.

[0068] Specifically, this stage mainly determines the number of stages of the turbine subsystem, the expansion ratio of each stage, and the rated mass flow of the expander. Figure 4 ,The parameter design process of the turbine subsystem includes the following steps:

[0069] S61: Determine the number of turbine stages N in the turbine subsystem e =n.

[0070] S62: Assume that the rated inlet mass flow rate of the turbine is Q e .

[0071] S63: Starting from j=1, traverse each pressure gradient release stage; when j=1, the turbine stage takes time t e =0, the pressure of the nth mine is P j .

[0072] S641: Determine the number of the mine holes that are performing the turbine gas release process in the current j-th gas injection stage: (n-j+1)~n; the gas injection mass flow rate m of each mine hole at this time d =Q e / j, calculate t maxPressure and temperature changes in each mine cavern involved in the turbine gas release process during the time period.

[0073] Among them, the number of turbine stages put into operation is: 1~j; the following formulas (4)~(6) are used with the time step t s is the step value, where t max A sufficiently large value should be chosen.

[0074]

[0075] Among them, ρ cav,0 is the density of the air in the mine at the initial gas release moment; ρ cav (t max ) is the released gas t max The density of the air in the mine at the moment; m d is the gas release mass flow rate of the current mine; M0 is the air mass of the mine at the initial moment; t max The degassing time.

[0076]

[0077] Among them, T cav,0 is the temperature of the air in the mine at the initial gas release time; h is the convection heat transfer coefficient between the air in the mine and the wall; A cav Mine surface area; T w is the mine wall temperature; c v is the specific heat capacity of air at constant volume; T cav (t max ) is the air density in the mine after gas injection time t.

[0078] P cav (t max )=ρ cav (t max )R g T cav (t max ) (6)

[0079] Among them, P cav (t) is the air pressure in the mine after the gas release time t; R g is the gas constant of air.

[0080] S642: Determine the number of the mines in the gas storage process at the current stage j: 1 to (nj); when j = n, no mine is involved in the gas storage process, calculate t max Changes in pressure and temperature of each mine cave involved in the gas storage process during the time period.

[0081] Specifically, let m d =0; Calculate t using formula (4) to formula (6)max Changes in pressure and temperature of each mine cave involved in the gas storage process during the time period.

[0082] S65: Assume that the initial gas storage pressure of the mine is P t , compared with t max The moment t when the pressure difference between the nth mine hole and the njth mine hole is less than 0.1 during the time period j ; When j = n, compare t max During the time period, the pressure of the nth mine and P t The time t that differs by less than 0.1 j .

[0083] S66: Record t i The pressure and temperature changes of mines 1 to n during the time period are recorded as t j The pressure of the nth mine at the moment is P tj .

[0084] S67: Determine t j Whether the pressure difference between adjacent mines is greater than dP within the time period.

[0085] If yes, return to S62 and adjust the rated intake mass flow of the turbine to Q e , and perform iterative calculation again.

[0086] If not, proceed to S68.

[0087] S68: Determine t e Is it greater than t3? Among them, t e =t e +t j The current turbine time is calculated by superposition.

[0088] If yes, return to S62 and adjust the rated intake mass flow of the turbine to Q e , re-iterate the calculation;

[0089] If not, proceed to S69.

[0090] S69: Determine whether j is n.

[0091] If not, proceed to S691.

[0092] S691: Record t j The pressure and temperature of the mine holes No. 1 to No. n at time are used as the initial parameters of the degassing stage j=j+1, and the process returns to S63.

[0093] If so, proceed to S692.

[0094] S692: The air injection phase ends, and the expansion ratios of the 1st to (n-1)th stage turbines along the air flow direction are P tj / P tj+1 , the expansion ratio of the nth stage turbine is P0 / P t Specifically, the first stage turbine is the first turbine that air enters after the gas storage outlet, followed by the second stage, and the nth stage is the last stage turbine, and the air from the nth stage turbine outlet is directly discharged to the environment. In this way, the expansion ratio of the first stage turbine is P j2 / P j1 ; The expansion ratio of the second stage turbine is P j3 / P j2 ; The expansion ratio of the third stage turbine is P j4 / P j3 , the expansion ratio of the nth stage turbine is P0 / P t .

[0095] The beneficial effects of the mine compressed air energy storage system design method provided by the embodiment of the present invention include:

[0096] This design method combines the valley power period in typical compressed air energy storage system operating scenarios with the calculation of the temperature and pressure change trends of the mine cave during the cascaded gas injection process to determine the design parameters of the compression subsystem. It also combines the flat power period in typical compressed air energy storage system operating scenarios with the calculation of the temperature and pressure change trends of the mine cave during the gas storage process. It also combines the peak power period in typical compressed air energy storage system operating scenarios with the calculation of the temperature and pressure change trends of the mine cave during the cascaded gas release process to determine the design parameters of the compression subsystem. The core of this design method is to determine the design parameters of the compression system and the turbine system based on the pressure and temperature changes of the mine cave during the cascaded gas storage and cascaded processes. This method not only fully incorporates the thermodynamic characteristics of the mine cave during the gas storage and release processes, but also effectively utilizes the peak, flat, and valley power periods of the power system in typical operating scenarios to achieve the rationality of the compressed air energy storage system design parameters. This can improve the energy storage density and power generation efficiency of the compressed air energy storage system.

[0097] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A design method for a mine compressed air energy storage system, characterized in that: The design method includes: S1: Count the number of mine caves n in the mine gas storage, and number the mine caves in order from the surface downwards; S2: Determine the peak, flat, and valley time periods of the power system where the mine compressed air energy storage system is located, and determine the peak power duration t1, flat power duration t2, and valley power duration t3 under the peak-valley arbitrage operation scenario of the mine compressed air energy storage system; S3: Analyze and measure the maximum bearing capacity P1 of the surrounding rock formation at the top of the No. 1 mine and the bearing capacity of the surrounding rock formation between adjacent mines, and select the minimum bearing capacity dP; S4: Calculate the changes in mine pressure and temperature during the compressed gas injection process and design the compression subsystem parameters, including determining the number of compression subsystem stages, the pressure increase ratio of each stage, the rated mass flow rate, and the temperature and pressure values ​​of each mine after the gas storage stage. S5: Calculate the changes in mine pressure and temperature during gas storage; S6: Calculate the changes in mine pressure and temperature during turbine degassing and design the turbine subsystem parameters, including determining the number of stages, expansion ratios of each stage, and rated mass flow of the expander.

2. The method for designing a mine compressed air energy storage system according to claim 1, characterized in that: In S1, the number of mines n=5, from top to bottom they are Mine No. 1, Mine No. 2, Mine No. 3, Mine No. 4 and Mine No.

5.

3. The method for designing a mine compressed air energy storage system according to claim 2, characterized in that: In S3, the maximum bearing capacity of the surrounding rock between the No. 1 mine cave and the No. 2 mine cave is dP1; the maximum bearing capacity of the surrounding rock between the No. 2 mine cave and the No. 3 mine cave is dP2; the maximum bearing capacity of the surrounding rock between the No. 3 mine cave and the No. 4 mine cave is dP3; the maximum bearing capacity of the surrounding rock between the No. 4 mine cave and the No. 5 mine cave is dP4; the bearing capacity between different mine caves is compared, and the minimum bearing value dP is selected.

4. The method for designing a mine compressed air energy storage system according to claim 3, wherein S4 include: S41: Determine the number of compressor stages N in the compression subsystem c =n, the gas storage pressure of the nth mine is P1+(n-1)dP; S42: Assuming that the ambient air pressure is P0, the compression ratio of the first-stage compressor is P1 / P0; the compression ratio of the n-stage compressor is [P1+(n-1)dP] / [P1+(n-2)dP], where n≥2; S43: Assume that the rated intake mass flow rate of the compressor is Q c ; S44: Starting from i=1, traverse each step-down gas storage stage; when i=1, the compression stage takes time t c =0; S451: Determine the mine number of the compressed gas injection process in the current i-th gas injection stage: i~n; the gas injection mass flow rate m of each mine at this time c =Q c / (n-i+1), calculate t max Pressure and temperature changes in each mine cavern involved in the compressed gas injection process during the time period; S452: Determine the number of the mines in the gas storage process in the current stage i: 1~(i-1); when i=1, no mine is involved in the gas storage process; calculate t max Changes in pressure and temperature of each mine cave involved in the gas storage process during the time period; S46: In t max Find the time t when the pressure of the i-nth mine reaches P1+(n-1)dP for the first time during the period i , record t i The pressure and temperature changes of mine holes 1 to n during the time period; S47: Determine t i During the time period, is the pressure difference between adjacent mines greater than dP? If so, return to S43; if not, proceed to S48; S48: Determine t c Is it greater than t1? Among them, t c =t c +t i The current compression time is calculated; if yes, return to S43; if no, proceed to S49; S49: Determine whether i is n; if not, proceed to S491; if so, proceed to S492; S491: Record t i The pressure and temperature of the mine holes 1 to n at time t1 are used as the initial parameters for the gas injection stage i=i+1, and the process returns to S44; S492: The gas injection phase ends and t is recorded. i The pressure and temperature of mine holes 1 to n at time are used as the initial parameters of the gas storage stage.

5. The method for designing a mine compressed air energy storage system according to claim 4, characterized in that: S41 includes: The maximum gas storage pressure of the No. 1 mine is determined to be P1; the maximum gas storage pressure of the No. 2 mine is determined to be P1+dP; the maximum gas storage pressure of the No. 3 mine is determined to be P1+2dP; and the gas storage pressure of the No. n mine is determined to be P1+(n-1)dP.

6. The method for designing a mine compressed air energy storage system according to claim 5, characterized in that: S42 includes: Assuming that the ambient air pressure is P0, the compression ratio of the first stage compressor is P1 / P0; the compression ratio of the second stage compressor is (P1+dP) / P1; the compression ratio of the third stage compressor is (P1+2dP) / (P1+dP); the compression ratio of the nth stage compressor is [P1+(n-1)d p ] / [P1+(n-2)dP].

7. The method for designing a mine compressed air energy storage system according to claim 6, characterized in that: S451 includes: Determine the number of compressor stages to be put into operation: 1~i stage; use the following formulas (1)~(3) with the time step ts as the step value to calculate t max Pressure and temperature changes in each mine cavern involved in the compressed gas injection process during the time period; （1） in, is the density of the air in the mine at the time of initial gas injection; It is gas injection The density of the air in the mine at that moment; is the gas injection mass flow rate of the current mine; is the air quality of the mine at the initial moment; is the gas injection time; is the air density in the mine after gas injection time t; （2） in, is the temperature of the air in the mine at the time of initial gas injection; is the convection heat transfer coefficient between the air and the wall in the mine; Mine surface area; is the air injection temperature; is the mine wall temperature; is the specific heat capacity of air at constant volume; ; is the air density in the mine after gas injection time t; （3） in, is the air pressure in the mine after gas injection time t; is the gas constant of air.

8. The method for designing a mine compressed air energy storage system according to claim 7, characterized in that: S452 includes: make ; Use formula (1) to formula (3) to calculate t max Changes in pressure and temperature of each mine cave involved in the gas storage process during the time period.

9. The method for designing a mine compressed air energy storage system according to claim 8, wherein S5 include: In the gas storage stage, the 1st to nth mines are all in the gas storage process, and the gas storage time is t1-t c +t2; ; Use formula (1) to formula (3) to calculate t1-t c During the +t2 period, the pressure and temperature changes of each mine cave involved in the gas storage process; the temperature and pressure of each mine cave after the gas storage stage are recorded as the initial values ​​of the turbine power generation and gas release process in the next stage.

10. The method for designing a mine compressed air energy storage system according to claim 9, wherein S6 include: S61: Determine the number of turbine stages N in the turbine subsystem e =n; S62: Assume that the rated inlet mass flow rate of the turbine is Q e ; S63: Starting from j=1, traverse each pressure release stage; when j=1, the turbine stage takes time t e =0, the pressure of the nth mine is P j ; S641: Determine the number of the mine holes that are performing the turbine gas release process in the current j-th gas injection stage: (n-j+1)~n; the gas injection mass flow rate m of each mine hole at this time d =Q e / j, calculate t max Pressure and temperature changes in each mine cavern involved in the turbine gas release process during the time period; S642: Determine the number of the mines in the gas storage process at the current stage j: 1~(nj); when j=n, no mine is involved in the gas storage process, calculate t max Changes in pressure and temperature of each mine cave involved in the gas storage process during the time period; S65: Assume that the initial gas storage pressure of the mine is P t , compared with t max The moment t when the pressure difference between the nth mine hole and the njth mine hole is less than 0.1 during the time period j ; When j = n, compare t max During the time period, the pressure of the nth mine and P t The time t that differs by less than 0.1 j ; S66: Record t i The pressure and temperature changes of mine holes 1 to n during the time period, record t j The pressure of the nth mine at the moment is P tj ; S67: Determine t j During the time period, is the pressure difference between adjacent mines greater than dP? If so, return to S62; if not, proceed to S68; S68: Determine t e Is it greater than t3? Among them, t e =t e +t j The current turbine time consumption is calculated by superposition; if yes, the process returns to S62; if no, the process proceeds to S69; S69: Determine whether j is n; if not, proceed to S691; if so, proceed to S692; S691: Record t j The pressure and temperature of the mine holes 1 to n at time t1 are used as the initial parameters for the gas release stage j=j+1, and the result is returned to S63; S692: The air injection stage ends, and the expansion ratios of the 1st to (n-1)th stage turbines along the air flow direction are P tj / P tj+1 , the expansion ratio of the nth stage turbine is P0 / P t .

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