A brine discharge device and brine discharge method for salt cavern gas storage

Abstract

The present invention relates to a brine discharge device and method for a salt cavern gas storage reservoir, the device comprising: an air injection pipe, a water injection pipe and a brine discharge pipe, the air injection pipe is inserted with a water injection pipe for adjusting the pressure by air injection; the water injection pipe is inserted with a brine discharge pipe for injecting clean water to dilute the brine in the salt cavern; the brine discharge pipe is provided with a crystal crusher for crushing the brine crystals entering the brine discharge pipe. The present invention dilutes the brine and sediment in the salt cavern through a dilution chamber and then discharges them from the brine discharge pipe. Due to the dilution, the brine is not easy to crystallize; at the same time, the crystal crusher can crush the crystals, which can effectively prevent the blockage caused by the crystallization; by discharging the sediment, the available space of the salt cavern can be effectively increased, and the gas storage capacity can be effectively increased; the existing brine discharge column structure is easily blocked at the port of the brine discharge pipe, and the brine cannot be discharged.

Description

Technical Field

[0001] The invention belongs to the technical field of salt cavern underground gas storage, and in particular relates to a brine discharge device and a brine discharge method for a salt cavern gas storage. Background Art

[0002] Underground salt caverns generally have a large space due to mining. The large storage space of underground salt caverns can store a large amount of natural gas or compressed air when energy is abundant, and consume the natural gas or compressed air stored in underground salt caverns when energy is low. Compared with manufacturing gas storage tanks, it can effectively reduce costs, and because it is stored in a confined underground space and stored through thick strata, it can effectively ensure safety and increase storage pressure.

[0003] Underground salt caverns are prone to produce sediment during the mining process. The sediment deposited at the bottom of the salt cavern will occupy a considerable part of the space inside the salt cavern, making it difficult to use it for gas storage. Therefore, it is necessary to discharge the sediment at the bottom of the salt cavern to expand the available space of the salt cavern. During the sediment discharge process, saturated brine is prone to crystallize with the sediment as the crystal nucleus, which can easily cause blockage of the brine discharge pipeline.

[0004] The prior art discloses a pipe column structure, method and salt cavern gas storage reservoir for preventing crystallization of gas injection and brine removal, wherein the pipe column structure includes: a brine discharge pipe, which is used to discharge brine in the gas storage reservoir; a fresh water injection pipe, which has a diameter smaller than that of the brine discharge pipe and is passed through the brine discharge pipe; when the brine discharge pipe discharges brine, the fresh water injection pipe injects fresh water into the brine discharge pipe to reduce the concentration of brine in the brine discharge pipe. Based on the technical solution of the present invention, the concentration of brine is reduced by injecting fresh water into the brine discharge pipe to avoid oversaturation of brine and precipitation of crystals, and water injection and brine removal can be carried out simultaneously and continuously, thereby ensuring the efficiency of gas injection and brine removal.

[0005] Although the above brine discharge pipe column structure can prevent crystallization in the brine discharge pipe by diluting with fresh water, the brine in the salt cavern is still easy to crystallize because it does not dilute the brine in the salt cavern. The brine crystals and sediments are easy to block the port of the brine discharge pipe when entering the port of the brine discharge pipe. Therefore, it is necessary to design a brine discharge device and a brine discharge method for a salt cavern gas storage to solve the above problems. Summary of the invention

[0006] In order to overcome the above problems existing in the prior art, the present invention provides a brine discharge device and a brine discharge method for a salt cavern gas storage, which are used to solve the currently existing technical problems.

[0007] A brine discharge device for a salt cavern gas storage, comprising: an air injection pipe, a water injection pipe and a brine discharge pipe.

[0008] Wherein, a water injection pipe is inserted into the gas injection pipe for adjusting the pressure by gas injection;

[0009] The water injection pipe is inserted with a brine discharge pipe for injecting clean water to dilute the brine in the salt cavern;

[0010] The brine discharge pipe is provided with a crystal crusher for crushing the brine crystals entering the brine discharge pipe.

[0011] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein the crystallization crusher includes: an upper straightening plate and a lower straightening plate fixed on the inner wall of the brine exhaust pipe, a support shaft, a crushing impeller and a reset module, the support shaft is movably installed between the upper straightening plate and the lower straightening plate, a plurality of groups of crushing impellers are arranged on the support shaft, and a reset module is arranged between the crushing impeller and the upper straightening plate.

[0012] According to the aspects described above and any possible implementation, an implementation is further provided, wherein a flange is provided on the support shaft above the crushing impeller, a support ring is provided on the support shaft above the flange, and a reset module is mounted on the support shaft between the support ring and the upper straightening plate.

[0013] According to the above aspects and any possible implementation manner, there is further provided an implementation manner, wherein the reset module is a reset spring.

[0014] According to the above aspects and any possible implementation, there is further provided an implementation, wherein the number of the crushing impellers is at least five, and a plurality of flow holes are respectively provided on the upper centralizing plate and the lower centralizing plate.

[0015] According to the aspects described above and any possible implementation, an implementation is further provided, wherein a plurality of the crystal breakers are sequentially arranged along the length direction of the brine exhaust pipe, and the number of the crystal breakers is determined according to the length of the brine exhaust pipe.

[0016] The present invention also provides a method for removing brine from a salt cavern gas storage, comprising the following steps:

[0017] 1) Drill a brine drainage well beside the salt cavern, drill the brine drainage well to the bottom of the salt cavern, and form a dilution cavity at the bottom of the brine drainage well;

[0018] 2) Continue drilling to connect the dilution chamber with the bottom of the salt cavern;

[0019] 3) lowering the brine discharge device of the salt cavern gas storage into the brine discharge well;

[0020] 4) Insert the injection pipe and the discharge pipe into the original brine well of the salt cavern, and extend the injection pipe and the discharge pipe to the top of the salt cavern;

[0021] 5) The brine discharge device of the salt cavern gas storage controls the liquid level and pressure in the dilution chamber, the injection pipe and the discharge pipe control the brine level and pressure in the salt cavern, and the flow direction of the brine is controlled by the pressure changes in the salt cavern and the dilution chamber;

[0022] 7) When brine is discharged from the brine discharge pipe of the brine discharge device of the salt cavern gas storage, the crystal crusher of the brine discharge pipe of the brine discharge device of the salt cavern gas storage crushes the brine crystals to prevent the brine from crystallizing into agglomerates or blocks, thereby preventing blockage.

[0023] According to the aspects described above and any possible implementation method, an implementation method is further provided, in which 3) is specifically: the brine discharge pipe and water injection pipe of the brine discharge device of the salt cavern gas storage are extended to the bottom of the dilution chamber, and the gas injection pipe of the brine discharge device of the salt cavern gas storage is extended to the top of the dilution chamber.

[0024] According to the aspects described above and any possible implementation method, an implementation method is further provided, wherein step 7) specifically includes: when brine is discharged from the brine discharge pipe, the crushing impellers of all crystal crushers are driven to rotate in sequence, and at the same time, the crushing impellers are driven to reciprocate axially through the pressure change of the brine and the reciprocating elastic force of the reset module of the crystal crusher, and the brine crystals are crushed by the rotating and axially reciprocating crushing impellers.

[0025] According to the above aspects and any possible implementation, an implementation is further provided, wherein the flow direction of the liquid includes:

[0026] (1) The clean water injected by the water injection pipe flows into the salt cavern through the connecting channel between the salt cavern and the dilution chamber under pressure;

[0027] (2) The brine in the salt cavern and the clean water injected into the salt cavern flow into the dilution chamber, and the sediment in the salt cavern is carried out by the water flow;

[0028] (3) injecting clean water into the dilution chamber through a water injection pipe to dilute the brine in the dilution chamber;

[0029] (4) The diluted brine carries the sediment and is discharged through the brine discharge pipe.

[0030] Beneficial effects of the present invention

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The brine discharge device and method for a salt cavern gas storage reservoir dilutes the brine and sediment in the salt cavern through a dilution chamber and then discharges the brine through a brine discharge pipe. Due to the dilution, the brine is not easy to crystallize; at the same time, the crystals can be crushed by a crystal crusher, which can effectively prevent blockage caused by crystallization; by discharging the sediment, the available space of the salt cavern can be effectively increased, and the gas storage capacity can be effectively increased; the problem that the existing brine discharge pipe column structure is prone to blockage at the brine discharge pipe port and cannot discharge brine is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the brine removal device of the salt cavern gas storage of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the crystal crusher of the present invention;

[0035] Figure 3 It is a schematic diagram of setting up the brine removal method of the present invention. DETAILED DESCRIPTION

[0036] In order to better understand the technical solution of the present invention, the content of the present invention includes but is not limited to the specific implementation methods below, and similar technologies and methods should be considered within the scope of protection of the present invention. In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0037] It should be clear that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0039] like Figure 1 As shown, the brine discharge device for salt cavern gas storage of the present invention comprises: a gas injection pipe 1, a water injection pipe 2 and a brine discharge pipe 3.

[0040] Wherein, a water injection pipe 2 is inserted into the gas injection pipe 1 for adjusting the pressure by gas injection;

[0041] The water injection pipe 2 is inserted with a brine discharge pipe 3 for injecting clean water to dilute the brine in the salt cavern; the brine discharge pipe 3 is provided with a crystal crusher 4 for crushing the brine crystals entering the brine discharge pipe 3.

[0042] On the one hand, the clean water injected through the water injection pipe 2 dilutes the brine and reduces the salt content in the brine, thereby preventing the brine from crystallizing; on the other hand, it dissolves the crystals wrapped with sediment, thereby effectively reducing the volume of sediment and crystals, making it easier for sediment and crystals to flow with the water flow. The function of the gas injection pipe 1 is to adjust the pressure by gas injection and control the flow of liquid. A brine discharge pipe 3 is inserted in the water injection pipe 2 to discharge brine and sediment outward through the brine discharge pipe 3. The sediment is discharged with the brine. By discharging the sediment, the available space of the salt cavern is increased, and the gas storage capacity is effectively increased. A plurality of crystal crushers 4 are evenly distributed in the brine discharge pipe 3, and the number of crystal crushers 4 is determined according to the length of the brine discharge pipe 3. The crystals in the brine discharge pipe 3 are crushed by the crystal crushers 4, which can further prevent crystallization, thereby effectively preventing the blockage of the brine discharge pipe 3, so that the brine discharge pipe 3 can continuously discharge the sediment from the bottom of the salt cavern.

[0043] like Figure 2As shown, the crystal crusher 4 includes an upper straightening plate 401 and a lower straightening plate 402 fixed on the inner wall of the brine discharge pipe 3, both of which have a straightening support function, a support shaft 403, a crushing impeller 404 and a reset spring 405. A support shaft 403 is movably installed between the upper straightening plate 401 and the lower straightening plate 402, and the support shaft 403 can rotate and move axially under the support of the upper straightening plate 401 and the lower straightening plate 402. A plurality of groups of crushing impellers 404 are arranged on the support shaft 403, and the number of the crushing impellers 404 is determined according to the length of the drilling. The longer the wellbore is, the corresponding number of crushing impellers 404 is arranged. The function of the crushing impeller 404 is to impact the crushing impeller 404 with the flowing brine during the brine discharge process of the brine discharge pipe 3, thereby driving the crushing impeller 404 to rotate. Through the rotation of the crushing impeller 404, the brine crystals on the inner wall of the brine discharge pipe 3 are broken, thereby effectively preventing crystallization on the inner wall of the brine discharge pipe 3, thereby effectively preventing the brine discharge pipe 3 from being blocked. Since the support shaft 403 can rotate and move axially, the crushing impeller 404 can rotate and move axially, so that the crystals on the inner wall of the brine exhaust pipe 3 can be crushed without dead angles. A flange 406 is provided on the support shaft 403 above the crushing impeller 404 for installing a thrust bearing. A support ring 408 is installed on the support shaft 403 above the flange 406 through a thrust bearing 407, which is used to prevent the spring from rotating when the thrust bearing 407 is idling and protect the spring. A reset spring 405 is installed on the support shaft 403 between the support ring 408 and the upper straightening plate 401. The function of the return spring 405 is to push the crushing impeller 404 downward through the return spring 405 when the pressure of the brine flowing in the brine discharge pipe 3 decreases, that is, when the upward impact force of the brine flowing in the brine discharge pipe 3 on the crushing impeller 404 decreases, and when the pressure of the brine flowing in the brine discharge pipe 3 increases, that is, when the upward impact force of the brine flowing in the brine discharge pipe 3 on the crushing impeller 404 increases, the crushing impeller 404 can be pushed upward by overcoming the elastic force of the return spring 405, thereby enabling the crushing impeller 404 to move axially. The function of the thrust bearing 407 is to prevent the return spring 405 from rotating relative to the support shaft 403 through the thrust bearing 407 and the support ring 408, thereby protecting the return spring 405. In order to enable the crushing impeller 404 to crush the crystals on the inner wall of the brine discharge pipe 3 outside the reset spring 405, the crushing impeller 404 below the flange 406 is tilted upward, similar to the tilt of a ship or submarine propeller, so that the crushing impeller 404 below the flange 406 can move to the bottom of the upper straightening plate 401 during axial movement, ensuring that all the crystals on the inner wall of the brine discharge pipe 3 can be crushed.

[0044] The upper and lower straightening plates 401 and 402 are provided with flow holes 409, respectively, so that brine can flow through the flow holes 409. The crushers are independent of each other, and the kinetic energy of water is used as a power source to drive the crushing impeller 404 to rotate. The flow holes 409 pass clean water, brine and sediment, and the clean water further dilutes the brine, and the diluted brine flows back.

[0045] As a disclosed embodiment, the present invention discloses a brine removal method for a salt cavern gas storage, comprising the following steps:

[0046] 1) Drill a brine drainage well beside the salt cavern, drill the brine drainage well to the bottom of the salt cavern, and form a dilution cavity 5 at the bottom of the brine drainage well;

[0047] 2) Continue drilling to connect the dilution chamber 5 with the bottom of the salt cavern;

[0048] 3) lowering the brine discharge device of the salt cavern gas storage into the brine discharge well, extending the brine discharge pipe 3 and the water injection pipe 2 of the brine discharge device of the salt cavern gas storage to the bottom of the dilution chamber 5, and extending the gas injection pipe 1 of the brine discharge device of the salt cavern gas storage to the top of the dilution chamber;

[0049] 4) Insert the injection pipe 6 and the discharge pipe 7 into the original brine mining well in the salt cavern, and extend the injection pipe 6 and the discharge pipe 7 to the top of the salt cavern;

[0050] 5) The liquid level and pressure in the dilution chamber 5 are controlled through the water injection pipe 2, the gas injection pipe 1, and the brine discharge pipe 3 in the brine discharge well, and the liquid level and pressure in the salt cavern are controlled through the injection pipe 6 and the discharge pipe 7;

[0051] 6) Control the flow direction of the liquid by pressure changes in the salt cavern and the dilution chamber 5;

[0052] 7) When the liquid is discharged from the brine discharge pipe 3, the liquid drives the crushing impeller 404 of the crystal crusher 4 to rotate. At the same time, the pressure change of the liquid and the elastic force of the return spring 405 drive the crushing impeller 404 to reciprocate axially. The crystals are crushed by the rotating and axially reciprocating crushing impeller 404, which prevents the brine from crystallizing into clumps or blocks, thereby preventing blockage.

[0053] Furthermore, the flow direction of the liquid in step 6) includes:

[0054] a. The clean water injected by the water injection pipe 2 flows into the salt cavern through the connecting passage between the salt cavern and the dilution chamber 5 under pressure. On the one hand, it dilutes the brine in the connecting passage between the salt cavern and the dilution chamber 5 to prevent the brine from crystallizing in the connecting passage between the salt cavern and the dilution chamber, causing the connecting passage between the salt cavern and the dilution chamber to be blocked. On the other hand, water is injected into the salt cavern to dissolve the crystals wrapped with sediment in the salt cavern.

[0055] b. The brine in the salt cavern and the clean water injected into the salt cavern flow into the dilution chamber 5, and the sediment in the salt cavern is taken out by the water flow;

[0056] c. The water injection pipe 2 injects clean water into the dilution chamber 5 to dilute the brine in the dilution chamber 5; d. The diluted brine carries the sediment and is discharged through the brine discharge pipe 3.

[0057] Specific as Figure 3 As shown, including:

[0058] A brine drainage well is drilled beside the salt cavern, with no distance requirement between the well and the salt cavern. The well is drilled to the bottom of the salt cavern, and a dilution chamber 5 is formed at the bottom of the well. Preferably, the dilution chamber 5 is a natural rock cave underground. Continue drilling to connect the dilution chamber 5 with the bottom of the salt cavern, so that the brine and sediment in the salt cavern can enter the dilution chamber 5 through the connecting channel between the dilution chamber 5 and the salt cavern. After the dilution chamber 5 is connected with the salt cavern, the brine drainage device of the salt cavern gas storage is lowered into the brine drainage well, and the brine drainage pipe 3 and the water injection pipe 2 of the brine drainage device of the salt cavern gas storage are extended to the bottom of the dilution chamber 5, and the gas injection pipe 1 of the brine drainage device of the salt cavern gas storage is extended to the top of the dilution chamber. The gas gathers at the top to drain the water. The injection pipe 6 and the discharge pipe 7 are lowered into the original brine extraction well in the salt cavern, and the injection pipe 6 and the discharge pipe 7 are extended to the bottom of the salt cavern, so that the bottom can absorb the brine and discharge it. If the salt cavern is complex, multiple vertical wells or inclined wells can be re-drilled to connect the top of the salt cavern to ensure that the flow direction of the sediment and brine at the bottom of the salt cavern can be controlled when the salt cavern is pressurized. The liquid level and pressure in the dilution chamber 5 are controlled by the water injection pipe 2, the gas injection pipe 1, and the brine discharge pipe 3 in the brine discharge well. The pressure is determined according to the downhole working conditions. The deeper the drilling, the greater the pressure. The liquid level is roughly controlled by time and does not need to be precisely controlled. Then the liquid level and pressure in the salt cavern are controlled by the injection pipe 6 and the discharge pipe 7. The flow direction of clean water or brine is controlled by the pressure changes in the salt cavern and the dilution chamber 5. The flow direction of the liquid includes: a. The clean water injected by the water injection pipe 2 flows into the salt cavern through the connecting channel between the salt cavern and the dilution chamber 5 under pressure, on the one hand diluting the brine in the connecting channel between the salt cavern and the dilution chamber 5 to prevent the brine from crystallizing in the connecting channel between the salt cavern and the dilution chamber and causing the connecting channel between the salt cavern and the dilution chamber to be blocked, and on the other hand injecting water into the salt cavern to dissolve the crystals wrapped with sediment in the salt cavern; b. The brine in the salt cavern carries and the clean water injected into the salt cavern by the injection pipe 6 flows into the dilution chamber 5, and the sediment in the salt cavern is taken out by the water flow; c. The water injection pipe 2 injects clean water into the dilution chamber 5 to dilute the brine in the dilution chamber 5; d. The diluted brine carries the sediment and is discharged through the brine discharge pipe 3. At this time, the crystals are broken, and only the diluted brine and sediment are left. The liquid, that is, the brine diluted with clean water is still brine, but the salt content is different. When discharged from the brine discharge pipe 3, the liquid drives the crushing impeller 404 of the crystal crusher 4 to rotate. At the same time, the pressure change of the liquid and the elastic force of the reset spring 405 drive the crushing impeller 404 to reciprocate axially. The crystals are crushed by the rotating and axially reciprocating crushing impeller 404 to prevent the brine from crystallizing into clumps or blocks, thereby preventing blockage. The whole process is controlled by pressure, and the pressure is determined according to the downhole working conditions such as the well depth.

[0059] The brine discharge device and method for the salt cavern gas storage reservoir dilutes the brine and sediment in the salt cavern through a dilution chamber and then discharges the brine through a brine discharge pipe. Due to the dilution, the brine is not easy to crystallize; at the same time, the crystal crusher 4 can crush the crystals, which can effectively prevent the blockage caused by the crystallization; by discharging the sediment, the available space of the salt cavern can be effectively increased, and the gas storage capacity can be effectively increased; the problem that the existing brine discharge pipe column structure is easy to cause blockage at the brine discharge pipe port and cannot discharge the brine is solved.

[0060] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not depart from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A brine removal device for a salt cavern gas storage, characterized in that: The device comprises: an air injection pipe, a water injection pipe and a brine discharge pipe, wherein the air injection pipe is inserted with a water injection pipe for adjusting the pressure by air injection; The water injection pipe is inserted with a brine discharge pipe for injecting clean water to dilute the brine in the salt cavern; The brine discharge pipe is provided with a crystal crusher for crushing the brine crystals entering the brine discharge pipe, and the crystal crusher comprises: an upper straightening plate and a lower straightening plate fixed on the inner wall of the brine discharge pipe, a support shaft, a crushing impeller and a reset spring, a support shaft is movably installed between the upper straightening plate and the lower straightening plate, and the support shaft rotates and moves axially under the support of the upper straightening plate and the lower straightening plate; a certain number of crushing impellers are arranged on the support shaft; a flange is arranged on the support shaft above the crushing impeller, and a support ring is installed on the support shaft above the flange through a thrust bearing, and a reset spring is mounted on the support shaft between the support ring and the upper straightening plate, and the crushing impeller below the flange is arranged to be inclined upward, so that the crushing impeller below the flange moves to the bottom of the upper straightening plate during the axial movement, so that all the crystals on the inner wall of the brine discharge pipe are crushed, and a plurality of flow holes are respectively arranged on the upper straightening plate and the lower straightening plate, and a plurality of the crystal crushers are arranged in sequence along the length direction of the brine discharge pipe, and the number depends on the length of the brine discharge pipe; The function of the crushing impeller is to impact the crushing impeller with the flowing brine during the brine discharge process of the brine discharge pipe, thereby driving the crushing impeller to rotate. Through the rotation of the crushing impeller, the brine crystals on the inner wall of the brine discharge pipe are broken up, thereby effectively preventing crystallization on the inner wall of the brine discharge pipe, thereby effectively preventing the brine discharge pipe from being blocked.

2. The brine removal device for salt cavern gas storage according to claim 1, characterized in that: The certain number of crushing impellers is at least five groups.

3. A brine removal method for a salt cavern gas storage, characterized in that: The following steps are involved: 1) Drill a brine drainage well beside the salt cavern, drill the brine drainage well to the bottom of the salt cavern, and form a dilution cavity at the bottom of the brine drainage well; 2) Continue drilling to connect the dilution chamber with the bottom of the salt cavern; 3) placing the brine discharge device for the salt cavern gas storage as claimed in any one of claims 1 to 2 into the brine discharge well; 4) Insert the injection pipe and the discharge pipe into the original brine well of the salt cavern, and extend the injection pipe and the discharge pipe to the top of the salt cavern; 5) The brine discharge device of the salt cavern gas storage controls the liquid level and pressure in the dilution chamber. The injection pipe and the discharge pipe control the brine level and pressure in the salt cavern. The flow direction of the liquid is controlled by the pressure changes in the salt cavern and the dilution chamber. 6) When brine is discharged from the brine discharge pipe of the brine discharge device of the salt cavern gas storage, the crystal crusher of the brine discharge pipe of the brine discharge device of the salt cavern gas storage crushes the brine crystals to prevent the brine from crystallizing into clumps or blocks, thereby preventing blockage.

4. The brine removal method for salt cavern gas storage according to claim 3, characterized in that: Specifically, the brine discharge pipe and water injection pipe of the brine discharge device of the salt cavern gas storage are extended to the bottom of the dilution chamber, and the gas injection pipe of the brine discharge device of the salt cavern gas storage is extended to the top of the dilution chamber.

5. The brine removal method for salt cavern gas storage according to claim 3, characterized in that: The step 6) specifically includes: when the brine is discharged from the brine discharge pipe, the crushing impellers of all the crystal crushers are driven to rotate in sequence, and at the same time, the crushing impellers are driven to reciprocate axially through the pressure change of the brine and the reciprocating elastic force of the return spring of the crystal crusher, and the brine crystals are crushed by the crushing impellers that rotate and reciprocate axially at the same time.

6. The brine removal method for salt cavern gas storage according to claim 3, characterized in that: The flow directions of the liquid include: (1) The clean water injected by the water injection pipe flows into the salt cavern through the connecting channel between the salt cavern and the dilution chamber under pressure; (2) The brine in the salt cavern and the clean water injected into the salt cavern flow into the dilution chamber, and the sediment in the salt cavern is carried out by the water flow; (3) The water injection pipe injects clean water into the dilution chamber to dilute the brine in the dilution chamber; (4) The diluted brine carries the sediment and is discharged through the brine discharge pipe.

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