Dechlorination System and Dechlorination Method for Salt Cavern Compressed Air Energy Storage

Abstract

This application relates to the field of novel energy storage technology in power system applications, and provides a dechlorination system and method for salt cavern compressed air energy storage. The dechlorination system includes a first separator, a mixer, a second separator, a first liquid storage tank, and an atomizing pump. The first separator, mixer, and second separator are connected sequentially. The first liquid storage tank is connected to the mixer via the atomizing pump, which drives the liquid in the first liquid storage tank to spray into the mixer, forming atomized droplets with a particle size larger than a set diameter. The first separator has an inlet for chlorinated air to enter, and it can separate droplets with a particle size larger than a set diameter from the chlorinated air to output primary dechlorinated gas. The primary dechlorinated gas can enter the mixer and mix with the atomized droplets to form a mixed gas. The mixed gas can enter the second separator, which can separate droplets with a particle size larger than a set diameter from the mixed gas to output dechlorinated air, thus achieving multi-stage dechlorination.

Description

Technical Field

[0001] This application relates to the field of novel energy storage technology in power system applications, and in particular to a dechlorination system and method for salt cavern compressed air energy storage. Background Technology

[0002] Against the backdrop of building a new power system, compressed air energy storage (CAES) technology using salt caverns has become a key technology for balancing grid fluctuations and improving the efficiency of renewable energy absorption due to its large-scale and long-cycle energy storage capabilities. Underground salt cavern gas storage facilities are widely regarded as ideal gas storage carriers for CAES systems due to their high geological stability, excellent sealing performance, and low construction costs. CAES technology converts electrical energy into the potential energy of compressed air and stores it in underground salt cavern gas storage facilities. During peak electricity demand periods, it generates electricity using compressed air, effectively smoothing grid load fluctuations and improving the absorption capacity of renewable energy. However, salt cavern gas storage facilities are located in a high-pressure, high-humidity chemical environment containing corrosive ions such as chloride ions. Within the salt cavern, water and chloride form solution-like chloride ion droplets that exist in a free form within the compressed air.

[0003] Current methods use mechanical separation devices to remove chloride ion droplets from compressed air. However, these devices can only remove larger chloride ion droplets; smaller droplets can pass through and enter subsequent power generation equipment. When compressed air from the salt cavern gas storage facility is used for power generation, chloride ion droplets can enter the downstream heat exchanger and expander, corroding the heat exchanger inner tubes and expander blades, thus shortening the equipment's lifespan. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a dechlorination system and dechlorination method for salt cavern compressed air energy storage.

[0005] The first aspect of this application provides a dechlorination system for compressed air energy storage in a salt cavern, including a first separator, a mixer, a second separator, a first storage tank, and an atomizing pump;

[0006] The first separator, the mixer, and the second separator are connected in sequence. The first liquid storage tank is connected to the mixer through the atomizing pump. The atomizing pump is used to drive the liquid in the first liquid storage tank to spray into the mixer, and form atomized droplets with a particle size larger than a set diameter in the mixer.

[0007] The first separator is provided with an air inlet for chlorine-containing air to enter. The first separator can separate droplets in the chlorine-containing air with a particle size larger than the set diameter, so as to output primary dechlorination gas.

[0008] The primary dechlorination gas can be introduced into the mixer and mixed with the atomized droplets to form a mixed gas. The mixed gas can be introduced into the second separator, which can separate droplets with a particle size larger than the set diameter from the mixed gas to output dechlorinated air.

[0009] Optionally, the first storage tank stores a mixed solution, which includes ethylene glycol and softened water.

[0010] Optionally, the atomizing pump includes a drive pump and an atomizing nozzle. The atomizing nozzle is connected to the inner cavity of the mixer. The atomizing nozzle has an opening with a diameter larger than the set diameter. The drive pump is connected between the first liquid storage tank and the atomizing nozzle. The drive pump can drive the liquid in the first liquid storage tank to be sprayed into the interior of the mixer through the opening of the atomizing nozzle.

[0011] Optionally, the first separator includes a first housing and a primary separator. The bottom of the first housing is provided with the air inlet, and the top of the first housing is provided with the air outlet. The air outlet is connected to the mixer through a pipe. The primary separator is disposed inside the first housing. The chlorine-containing air passes through the primary separator to be separated into the primary dechlorinated gas, the first residual liquid, and solid impurities.

[0012] Optionally, the second separator includes a second housing, a first coupling separator, and a second coupling separator;

[0013] The first coupling separator and the second coupling separator are disposed inside the second housing. The bottom of the second housing is provided with a vent, and the top of the second housing is provided with an exhaust port for the dechlorinated air to be discharged.

[0014] The vent is connected to the mixer. The first coupling separator is located on the lower side of the second separator, and the second coupling separator is located on the upper side of the second separator. The droplet size that the first coupling separator can separate is larger than the droplet size that the second coupling separator can separate. The mixed gas passes through the first coupling separator and the second coupling separator in sequence to remove droplets with a particle size larger than the set diameter to output dechlorinated air.

[0015] Optionally, the dechlorination system for compressed air energy storage in the salt cavern further includes a second liquid storage tank, which is connected to the second separator. The mixed gas can be separated in the second separator to form the dechlorinated air and the second residual liquid, and the second residual liquid can be introduced into the second liquid storage tank.

[0016] Optionally, the mixer includes a cylindrical structure, the interior of which forms a mixing chamber. The cylindrical structure is arranged horizontally, and its two ends are respectively connected to the first separator and the second separator via pipes.

[0017] The cylindrical structure has a spray port in the middle that communicates with the mixing chamber. The spray port is located at one end of the cylindrical structure near the first separator. The first liquid storage tank is connected to the spray port through the atomizing pump.

[0018] Optionally, the dechlorination system for salt cavern compressed air energy storage further includes a controller, and a detector is provided in the first separator. The detector is used to detect the air pressure entering the first separator, and the controller is connected to the detector and the atomizing pump.

[0019] The controller controls the atomizing pump based on the detection data of the detector, so that when the air pressure in the first separator increases, the pressure of the liquid in the first storage tank entering the mixer increases synchronously; when the air pressure in the first separator decreases, the pressure of the liquid in the first storage tank entering the mixer decreases synchronously.

[0020] Optionally, the controller controls the power of the atomizing pump based on the data from the detector, so that the pressure of the liquid in the first storage tank entering the mixer is greater than the pressure in the first separator.

[0021] The second aspect of this application provides a method for dechlorination of compressed air energy storage in salt caverns, comprising the following steps:

[0022] Chlorine-containing air is passed into a first separator, which separates droplets with a particle size larger than a set diameter from the chlorine-containing air to output primary dechlorinated gas.

[0023] An atomizing pump drives the liquid in the first storage tank to spray into a mixer, and atomized droplets with a particle size larger than a set diameter are formed in the mixer. The mixer receives the primary dechlorination gas, and the primary dechlorination gas mixes with the atomized droplets to form a mixed gas.

[0024] The second separator receives the mixed gas and separates droplets in the mixer that have a particle size larger than the set diameter, so as to output dechlorinated air.

[0025] The technical solution provided in this application has the following advantages compared with the prior art:

[0026] This application provides a dechlorination system and method for compressed air energy storage in salt caverns. The dechlorination system includes a first separator that initially separates chloride ion droplets from chlorine-containing air to form primary dechlorinated gas. An atomizing pump atomizes liquid in a first storage tank into atomized droplets. The primary dechlorinated gas and atomized droplets are thoroughly mixed in a mixer to increase the diameter of chloride ion-containing droplets in the mixture. A second separator separates droplets in the mixture to further remove chloride ions from the compressed air. The first storage tank, atomizing pump, and mixer work together to allow smaller chloride ion-containing droplets to dissolve into the atomized droplets, causing the chloride ion droplets to coalesce and form chloride ion-containing droplets with a larger diameter than a set value. These droplets are then removed by the second separator, achieving multi-stage dechlorination of the compressed air. Furthermore, the mixing of chloride ion droplets with atomized droplets in the mixer reduces the concentration of chloride ions in the chloride ion-containing droplets. Compared to traditional methods of separating chloride-containing droplets, this multi-stage dechlorination system can further reduce the mass percentage of chloride-containing droplets in the dechlorinated air. Furthermore, the mixing of chloride-containing droplets with atomized liquid in the mixer can further reduce the chloride ion concentration in the chloride-containing droplets, thereby reducing the corrosiveness of residual chloride-containing droplets in the dechlorinated air and reducing corrosion of the subsequent power generation system. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the dechlorination process for salt cavern compressed air energy storage described in the embodiments of this application;

[0030] Figure 2 This is a flowchart of the dechlorination method for salt cavern compressed air energy storage described in the embodiments of this application.

[0031] Among them, 1, first separator; 2, mixer; 3, second separator; 31, second housing; 32, first coupling separator; 33, second coupling separator; 4, first liquid storage tank; 5, atomizing pump; 51, drive pump; 52, atomizing nozzle; 6, second liquid storage tank. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0034] Reference Figure 1 As shown, the first aspect of this application provides a dechlorination system for compressed air energy storage in a salt cavern, including a first separator 1, a mixer 2, a second separator 3, a first liquid storage tank 4, and an atomizing pump 5. The first separator 1, the mixer 2, and the second separator 3 are connected in sequence. The first liquid storage tank 4 is connected to the mixer 2 through the atomizing pump 5. The atomizing pump 5 is used to drive the liquid in the first liquid storage tank 4 to spray into the mixer 2, and form atomized droplets with a particle size larger than a set diameter in the mixer 2. The first separator 1 is provided with an air inlet for chlorinated air to enter. The first separator 1 can separate droplets with a particle size larger than a set diameter in the chlorinated air to output primary dechlorination gas. The primary dechlorination gas can enter the mixer 2 and mix with the atomized droplets to form a mixed gas. The mixed gas can enter the second separator 3, and the second separator 3 can separate droplets with a particle size larger than a set diameter in the mixed gas to output dechlorinated air.

[0035] Specifically, the first separator 1 can be a cylindrical vertical structure with an internal cyclone separator element and a liquid capture mesh on top. The bottom of the housing has an air inlet suitable for the air intake load, and the top has an air outlet, allowing gas to enter the housing through the inlet and exit through the outlet. The bottom of the housing also has a drain pipe for collecting separated droplets and impurities.

[0036] The chlorine-containing air in the aforementioned salt cavern gas storage tank has a relatively high pressure, which gives it a certain velocity when it enters the first separator 1. The chlorine-containing air enters the first separator 1 from the bottom inlet at a certain velocity, and the centrifugal force generated by the cyclone separation element throws chloride ion liquid larger than the set diameter onto the inner wall of the cyclone separation element. The flow velocity of the chlorine-containing air can be selected from 15-20 m / s, and the flow velocity varies according to the gas pressure in the salt cavern gas storage tank. The set diameter can be selected as 10 μm. Solid impurities in the chlorine-containing air will also move to the inner wall of the cyclone separation element due to centrifugal force.

[0037] The chlorine-containing gas mentioned above is separated by a cyclone separation element in the first separator 1, which removes solid impurities and part of the chloride ion liquid, forming air and a primary dechlorinated gas with chloride ion liquid particles smaller than the set diameter. The primary dechlorinated gas can be introduced into the mixer 2 under the gas pressure in the first separator 1.

[0038] Alternatively, the first separator 1 can be equipped with multiple layers of filters with filter holes of a set diameter. When chlorine-containing gas passes through the filters, chlorine ions larger than the set diameter will be blocked by the filters. The set diameter can be selected as 10μm.

[0039] The mixer 2 described above can be a horizontally arranged cylindrical structure. One end of the mixer 2 is connected to the first separator 1 through a pipe, and the other end is connected to the second separator 3 through a pipe. An opening is provided on the mixer 2, and the output end of the atomizing pump 5 is located inside the atomizer through the opening, so that the liquid in the first liquid storage tank 4 is sprayed into the mixer 2 through the atomizing pump 5 and the opening.

[0040] The liquid in the first storage tank 4 is selectively formed into droplets with a diameter larger than a set diameter by the atomizing pump 5. These droplets come into contact with and dissolve the residual chloride ion droplets in the primary dechlorination gas. One droplet can dissolve multiple chloride ion liquids, causing multiple chloride ion liquids to aggregate and form a large droplet. After the atomized droplets are fully mixed with the primary dechlorination gas, a mixed gas is formed. The diameter of the chloride ion liquid in the mixed gas is larger than the set diameter. When the mixed gas passes through the second separator 3, the second separator 3 separates the droplets with a diameter larger than the set diameter in the mixed gas. The chloride ion liquid in the mixed gas is separated in the second separator 3 to form dechlorinated air.

[0041] The aforementioned atomizing pump 5 can be selected as a high-pressure plunger pump. The output end of the atomizing pump 5 can be equipped with a nozzle. The nozzle has multiple openings. The liquid in the first storage tank 4 is sprayed into the mixer 2 through the multiple openings of the nozzle under the drive of the atomizing pump 5. The diameter of the opening can be greater than or equal to a set diameter, which can be selected as 10μm, so that the particle size of the atomized droplets is greater than the set diameter. This ensures that the size of the atomized droplets of chloride ion droplets in the primary dechlorination gas is greater than the set diameter, so as to facilitate the removal of the atomized droplets containing chloride ion droplets in subsequent processing.

[0042] Traditional filtration methods can only filter droplets with a diameter larger than a set value. Even after multiple filtrations, chlorine-containing compressed air will still contain many droplets with a diameter smaller than the set value, resulting in a high concentration of chlorine ions in the filtered compressed air, which can easily corrode power generation equipment.

[0043] However, after the primary dechlorination gas is mixed with the atomized droplets to form a mixed gas, the chloride-containing droplets in the primary dechlorination gas dissolve into the atomized droplets, increasing the size of the chloride-containing droplets in the mixed gas. After the mixed gas passes through the second separator 3, droplets with a particle size larger than the set diameter are removed to form dechlorinated air, so that the chloride ion concentration in the dechlorinated air is lower than the chloride ion concentration in the compressed air treated by the traditional filtration method.

[0044] In specific use, the dechlorination system for compressed air energy storage in salt caverns provided in this application embodiment involves the following steps: High-pressure chlorinated air from the underground salt cavern gas storage tank is introduced into the first separator 1. The first separator 1 removes droplets with a diameter larger than a set value from the chlorinated air to initially remove chloride ion droplets and form primary dechlorinated gas. The primary dechlorinated gas is then introduced into the mixer 2, where the atomizing pump 5 atomizes the liquid in the first storage tank 4 and sprays it into the mixer 2, allowing the primary dechlorinated gas to fully mix with the atomized droplets. Smaller chloride ion droplets in the primary dechlorinated gas dissolve into the atomized droplets to form a mixed gas. The mixed gas is then introduced into the second separator 3, where the second separator 3 separates droplets with a diameter larger than a set value from the mixer to form dechlorinated air. The dechlorinated air is then output from the second separator 3 and enters the subsequent power generation equipment.

[0045] The dechlorination system for compressed air energy storage in salt caverns provided in this application embodiment includes a first separator 1 that initially separates chloride ion droplets from chlorine-containing air to form primary dechlorinated gas. An atomizing pump 5 atomizes the liquid in a first storage tank 4 into atomized droplets. The primary dechlorinated gas and the atomized droplets are thoroughly mixed in a mixer 2 to increase the diameter of the chloride ion-containing droplets in the mixed gas. A second separator 3 separates the droplets in the mixed gas to further remove chloride ions from the compressed air. The first storage tank 4, the atomizing pump 5, and the mixer 2 work together to allow smaller chloride ion-containing droplets to dissolve into the atomized droplets, causing the chloride ion droplets to coalesce and form chloride ion-containing droplets with a diameter larger than a set value. These droplets in the mixed gas are then removed by the second separator 3, thus achieving multi-stage dechlorination of the compressed air. Furthermore, the mixing of chloride ion droplets and atomized droplets in the mixer 2 reduces the concentration of chloride ions in the chloride ion-containing droplets. Compared to traditional methods of separating chloride-containing droplets, this multi-stage dechlorination system can further reduce the mass proportion of chloride-containing droplets in the dechlorinated air. Furthermore, the mixing of chloride-containing droplets with atomized liquid in mixer 2 can further reduce the chloride ion concentration in the chloride-containing droplets, thereby reducing the corrosiveness of residual chloride-containing droplets in the dechlorinated air and reducing corrosion of the subsequent power generation system.

[0046] Reference Figure 1 As shown, in some embodiments, the first storage tank 4 stores a mixed solution, which includes ethylene glycol and softened water.

[0047] With this configuration, the first storage tank 4 stores the mixed solution. Ethylene glycol and softened water work together to reduce the surface tension of the mixed solution. Furthermore, the hydroxyl groups of ethylene glycol can synergistically interact with water molecules to enhance the solubilization ability of chloride ions. This makes it easier for chloride ion droplets to dissolve into the droplets formed by atomization of the mixed solution, allowing more chloride ion droplets in the primary dechlorination gas to dissolve into the atomized droplets, thereby improving the effect of the second separator 3 in removing chloride ions from the mixed gas.

[0048] Specifically, the mass percentage of ethylene glycol in the mixed solution can be chosen to be 85%, with the remainder being softened water. Softened water refers to natural water containing small amounts of soluble magnesium and calcium salts; it can also be described as hard water that has undergone softening treatment. The water quality of softened water is between 0-60 ppm.

[0049] Ethylene glycol is a dihydroxy organic compound with strong polarity and hydrogen bonding ability. When dissolved in water, it significantly reduces the surface tension of the solution. The lower the surface tension, the smaller the interfacial energy of the droplets, making them more prone to deformation and fusion upon collision. Pure water, with its high surface tension, tends to maintain a spherical shape and may bounce rather than fuse after collision with other droplets. Ethylene glycol-water solutions have lower surface tension and are more likely to fuse with other droplets.

[0050] The hydroxyl groups of ethylene glycol can synergistically interact with water molecules, enhancing their solubilization ability for chloride ions through a stronger hydrogen bond network and polar interactions. This reduces the repulsive effect of chloride ions at the droplet interface, promoting their diffusion into the droplet interior. Softened water removes hard water ions such as calcium and magnesium, preventing these cations from forming insoluble salts (such as calcium chloride) with chloride ions, thereby reducing precipitation and making chloride ions easier to disperse uniformly. The optimal mixing ratio of ethylene glycol and softened water is calculated based on the operating parameters of each salt cavern compressed air energy storage power generation gas extraction process.

[0051] Reference Figure 1 As shown, in some embodiments, the atomizing pump 5 includes a drive pump 51 and an atomizing nozzle 52. The atomizing nozzle 52 is connected to the inner cavity of the mixer 2. The atomizing nozzle 52 is provided with an opening with a diameter larger than a set diameter. The drive pump 51 is connected between the first liquid storage tank 4 and the atomizing nozzle 52. The drive pump 51 can drive the liquid in the first liquid storage tank 4 to be sprayed into the interior of the mixer 2 through the opening of the atomizing nozzle 52.

[0052] With this configuration, the drive pump 51 provides power for the liquid flow in the first storage tank 4, and the atomizing nozzle 52 can atomize the liquid. The diameter of the opening limits the diameter of the atomized droplets. The diameter of the opening is larger than the diameter of the atomized droplets, so that the sprayed atomized droplets can be removed in the second separator 3, preventing the atomized droplets from entering the power generation equipment.

[0053] Specifically, the drive pump 51 can be a water pump or a plunger pump, and the atomizing nozzle 52 can be a nozzle structure made of a corrosion-resistant alloy, such as a nozzle structure made of a metal material with a high nickel content. The atomizing nozzle 52 has multiple openings, and the liquid in the first liquid storage tank 4 is sprayed out through the multiple openings on the atomizing nozzle 52 to form atomized droplets. The size of the openings limits the size of the atomized droplets. The particle size of the atomized droplets formed after the liquid passes through the openings is less than or equal to the diameter of the opening. The diameter of the opening can be equal to or greater than the set diameter.

[0054] Reference Figure 1 As shown, in some embodiments, the first separator 1 includes a first housing and a primary separator. The bottom of the first housing is provided with an air inlet, and the top of the first housing is provided with an air outlet. The air outlet is connected to the mixer 2 through a pipe. The primary separator is disposed inside the first housing. Chlorine-containing air passes through the primary separator to be separated into primary dechlorinated gas, first residual liquid and solid impurities.

[0055] With this configuration, the first housing contains chlorine-containing air, and the primary separator performs preliminary separation of the chlorine-containing space, so that the gas entering the mixer 2 contains only chloride ion droplets with a particle size smaller than the set diameter.

[0056] Specifically, the first housing can be a vertical cylindrical structure with a hollow interior. The primary separator is installed inside the housing, the air inlet is located at the bottom of the first housing, and the air outlet is located at the top of the first housing. This allows the chlorine-containing air to move upwards within the first housing, and after passing through the primary separator, it can move to the air inlet. The air outlet at the top of the first housing is connected to the mixer 2 via a pipe.

[0057] The aforementioned primary separation element may include a cyclone separator, in which the gas can flow in a spiral pattern along the height of the first housing. The cyclone separator may be made of corrosion-resistant nickel alloy. Chlorinated air moves upward along the cyclone separator, and the chlorinated air generates centrifugal force, driving chloride ion droplets and solid impurities with a particle size larger than a set diameter to move to the inner wall of the cyclone separator. After passing through the primary separation element, chloride ion droplets with a particle size smaller than the set diameter in the air form primary dechlorinated gas. The chloride ion droplets thrown onto the inner wall of the cyclone separator accumulate to form the first residual liquid, and the solid particles thrown onto the inner wall of the cyclone separator are solid impurities.

[0058] Alternatively, a primary separation component can be selected, including multiple layers of filters. The multiple layers of filters are spaced apart, and the filters have filter holes with a diameter greater than or equal to the set diameter, so that chlorine-containing air can pass smoothly through the multiple layers of filters, and chlorine ion droplets and solid particles with a particle size greater than the set diameter in the chlorine-containing air can be blocked by the multiple layers of filters.

[0059] Reference Figure 1 As shown, in some embodiments, the second separator 3 includes a second housing 31, a first coupling separator 32, and a second coupling separator 33; the first coupling separator 32 and the second coupling separator 33 are disposed inside the second housing, the bottom of the second housing 31 is provided with a vent, and the top of the second housing 31 is provided with an exhaust port for dechlorinated air to be discharged; the vent is connected to the mixer 2, the first coupling separator 32 is disposed on the lower side of the second separator 3, and the second coupling separator 33 is disposed on the upper side of the second separator 3. The droplet size that the first coupling separator 32 can separate is larger than the droplet size that the second coupling separator 33 can separate, and the mixed gas passes through the first coupling separator 32 and the second coupling separator 33 in sequence to remove droplets with a particle size larger than a set diameter to output dechlorinated air.

[0060] With this configuration, the mixed gas enters from the bottom vent, passes through the first coupling separator 32 for coarse filtration and the second coupling separator 33 for fine filtration, and finally the dechlorinated air is discharged from the top exhaust port. The first coupling separator 32 removes larger droplets to prevent them from affecting the passage of the mixed gas through the second coupling separator 33.

[0061] Specifically, the second housing 31 is a vertical cylindrical structure. A vent is provided at the bottom of the second housing 31, and an exhaust port is provided at the top of the second housing 31. The mixed gas enters the interior of the second housing 31 from the vent and moves upward to the exhaust port. During the movement, the mixed gas passes through the first coupling separator 32 and the second coupling separator 33 in sequence.

[0062] The first coupling separator 32 described above can be a cyclone separator or a common cyclone separator. The diameter of the filter holes in the first coupling separator 32 is larger than a set diameter, allowing larger droplets in the gas mixture to be filtered first, thus completing the coarse filtration operation. Alternatively, the first coupling separator 32 can be selected to separate droplets with a diameter less than 10 μm in the gas mixture, thus completing the coarse filtration operation.

[0063] The aforementioned second coupling separator 33 may include a fiber coalescing filter element, allowing the coarse mixed gas to pass through a multi-layer fiber coalescing filter element. The pore diameter of the fiber coalescing filter element may be selected as 10 μm, or it may be selected as 5 μm. Droplets of chloride ions with a particle size larger than the set diameter in the gas passing through the second coupling separator 33, which are mixed with the atomized liquid, can be filtered to complete the fine filtration operation of the mixed gas.

[0064] Reference Figure 1As shown, in some embodiments, the dechlorination system of salt cavern compressed air energy storage also includes a second liquid storage tank 6, which is connected to the second separator 3. The mixed gas can be separated in the second separator 3 to form dechlorinated air and a second residual liquid, and the second residual liquid can be introduced into the second liquid storage tank 6.

[0065] With this configuration, the second storage tank 6 collects the second residual liquid, which can be recycled into the first storage tank 4 after regeneration, thus saving costs.

[0066] Specifically, the body of the second storage tank 6 is a horizontal cylindrical shape. The second storage tank 6 is connected to the bottom of the second separator 3 through a pipe. The liquid droplets separated in the second separator 3 can converge to form a second residual liquid. The second residual liquid accumulates at the bottom of the second separator 3, so that the liquid droplets separated in the second separator 3 can enter the second storage tank 6 for storage.

[0067] The second residual liquid is collected in the second storage tank 6. The second residual liquid has a high chloride ion concentration. After the chloride ions are removed by regeneration treatment, the second residual liquid can be recycled back into the first storage tank 4. When the first storage tank 4 stores a mixed solution of ethylene glycol and softened water, the chloride ions in the second residual liquid can be removed by neutralization and evaporation recrystallization to obtain a mixed solution, allowing the second residual liquid to be recycled.

[0068] Reference Figure 1 As shown, in some embodiments, the mixer 2 includes a cylindrical structure, the interior of which forms a mixing chamber. The cylindrical structure is arranged in a horizontal direction, and its two ends are connected to the first separator 1 and the second separator 3 through pipes, respectively. A spray port connected to the mixing chamber is provided in the middle of the cylindrical structure. The spray port is located at one end of the cylindrical structure near the first separator 1, and the first liquid storage tank 4 is connected to the spray port through an atomizing pump 5.

[0069] With this configuration, the spray nozzle is positioned close to the first separator 1, ensuring that the primary dechlorination gas comes into contact with the atomized droplets upon entering the cylinder structure, thus guaranteeing thorough mixing between the primary dechlorination gas and the atomized droplets. The cylinder structure is horizontally oriented, allowing the primary dechlorination gas to move along its length, increasing the gas's travel distance.

[0070] Specifically, the interior of the cylindrical structure is hollow, the cylindrical structure is arranged in a horizontal direction, the front end of the cylindrical structure is connected to the air outlet of the first separator 1 through a pipe, and the rear end of the cylindrical structure is connected to the air inlet of the second separator 3.

[0071] The cylinder structure has a spray port on the top side in the height direction and is located in the middle of the cylinder structure in the horizontal direction. The spray port can be used to accommodate the nozzle of the atomizing pump 5. The spray port is close to the front end of the cylinder structure so that the primary dechlorination gas can come into contact with the atomized droplets when it enters the cylinder structure, ensuring that the primary dechlorination gas and the atomized droplets are fully mixed.

[0072] Reference Figure 1 As shown, in some embodiments, the dechlorination system of salt cavern compressed air energy storage also includes a controller. A detector is provided in the first separator 1 to detect the air pressure entering the first separator 1. The controller is connected to the detector and the atomizing pump 5. The controller controls the atomizing pump 5 according to the detection data of the detector so that when the air pressure in the first separator 1 increases, the pressure of the liquid in the first storage tank 4 entering the mixer 2 increases synchronously; when the air pressure in the first separator 1 decreases, the pressure of the liquid in the first storage tank 4 entering the mixer 2 decreases synchronously.

[0073] With this setup, the controller and detector work together to control the power of the atomizing pump 5 in real time, so that the pressure of the atomized droplets matches the pressure of the primary dechlorination gas, ensuring that the primary dechlorination gas and the atomized droplets can be fully mixed while saving energy.

[0074] Specifically, the detector can be a piezoresistive pressure sensor, installed in the middle of the outlet pipe of the first separator 1, or on the top wall inside the first separator 1. The detector monitors the gas pressure in real time.

[0075] The aforementioned controller hardware is a PLC controller or chip. The controller is connected to the atomizing pump 5 and can control the power of the atomizing pump 5. When the air pressure measured by the detector increases, the controller outputs a signal to increase the speed of the atomizing pump 5, thereby increasing the pressure of the liquid in the first storage tank 4 after atomization before entering the mixer 2. When the air pressure measured by the detector decreases, the controller outputs a signal to decrease the speed of the atomizing pump 5, thereby reducing the pressure of the liquid in the first storage tank 4 after atomization before entering the mixer 2.

[0076] When the pressure of the primary dechlorinated gas in the first separator 1 increases, the flow rate of the primary dechlorinated gas entering the mixer 2 will increase, and the residence time of the primary dechlorinated gas in the mixer 2 will decrease. Therefore, it is necessary to increase the pressure of the atomized droplets entering the mixer 2 to increase the flow rate of the atomized droplets, increase the concentration of the atomized droplets in the mixer 2, and ensure that the chloride ion droplets in the primary dechlorinated gas can dissolve into the atomized droplets.

[0077] When the pressure of the primary dechlorinated gas in the first separator 1 decreases, the flow rate of the primary dechlorinated gas into the mixer 2 decreases, and the pressure of the atomized droplets entering the mixer 2 decreases simultaneously. The concentration of the atomized droplets in the mixer 2 decreases. Since the residence time of the primary dechlorinated gas in the mixer 2 increases, the atomized droplets can be fully mixed with the primary dechlorinated gas at this time.

[0078] The chlorine-containing air is introduced into the first separator 1 through a salt cavern storage tank. The gas pressure output from the salt cavern storage tank is unstable and fluctuates within a certain range. Through the cooperation of the controller and the detector, the pressure of the atomized droplets entering the mixer 2 can be controlled in real time to ensure the dechlorination effect.

[0079] Reference Figure 1 As shown, in some embodiments, the controller controls the power of the atomizing pump 5 based on the data from the detector, so that the pressure of the liquid in the first storage tank 4 entering the mixer 2 is greater than the pressure in the first separator 1.

[0080] This configuration ensures that the atomized droplets can enter the mixer 2 through the control of the controller, preventing the primary dechlorination gas in the mixer 2 from backflowing into the atomizing pump 5 and damaging it.

[0081] Specifically, the controller controls the power of the atomizing pump 5 to control the pressure of the atomized droplets entering the mixer 2. The pressure difference between the liquid in the first storage tank 4 entering the mixer 2 and the pressure in the first separator 1 can be greater than or equal to 1 MPa. Because high-pressure chlorine-containing air is introduced into the first separator 1, the primary dechlorination gas output from the first separator 1 also has a high pressure, resulting in a higher gas pressure in the mixer 2. The pressure of the liquid in the first storage tank 4 entering the mixer 2 is greater than the pressure in the first separator 1, ensuring that the atomized droplets smoothly enter the mixer 2 and preventing the primary dechlorination gas in the mixer 2 from backflowing into the atomizing pump 5.

[0082] The dechlorination system for compressed air energy storage provided in this application embodiment is applied to a compressed air energy storage expansion reheat power generation system. The compressed air energy storage expansion reheat power generation system includes an energy storage system, an energy release system, and a heat storage system. The energy storage system has a salt cavern gas storage tank to store compressed air. A first separator 1 is connected to the salt cavern gas storage tank so that the gas in the salt cavern gas storage tank can be passed into the first separator 1. The energy release system is used for power generation. A second separator 3 is connected to the energy release system so that the energy release system utilizes the dechlorinated air discharged from the second separator 3.

[0083] Specifically, the air inlet and the salt cavern gas storage can be connected by a pipeline. There is a valve on the pipeline. The salt cavern gas storage contains high-pressure air. When the valve is opened, the high-pressure air enters the first separator 1 under its own pressure.

[0084] The aforementioned energy release system includes a generator. The generator's air inlet is connected to the exhaust port of the second separator 3. The high-pressure chlorine-containing air from the salt cavern gas storage tank enters the aforementioned dechlorination system for compressed air energy storage in the salt cavern for dechlorination. The dechlorinated air then enters the generator to generate electricity, and the electricity generated by the generator is input into the power grid.

[0085] By using the aforementioned dechlorination system for salt cavern compressed air energy storage in a salt cavern compressed air power generation device, high-pressure chlorine-containing air undergoes multi-stage dechlorination after passing through the system to output dechlorinated air. Compared to traditional methods of separating chloride-containing droplets, this system further reduces the mass percentage of chloride-containing liquid in the dechlorinated air and lowers the chloride ion concentration in the dechlorinated gas. This reduces the corrosiveness of residual chloride-containing droplets in the dechlorinated air, decreases corrosion of the subsequent power generation system, and extends the service life of the power generation system.

[0086] Reference Figure 2 As shown, a second aspect of this application also provides a dechlorination method for compressed air energy storage in salt caverns, comprising the following steps:

[0087] Chlorine-containing air is introduced into the first separator 1, which separates droplets with a particle size larger than a set diameter from the chlorine-containing air to output primary dechlorinated gas.

[0088] The atomizing pump 5 drives the liquid in the first storage tank 4 to spray into the mixer 2, and forms atomized droplets with a particle size larger than the set diameter in the mixer 2. The mixer 2 receives the primary dechlorination gas, and the primary dechlorination gas mixes with the atomized droplets to form a mixed gas.

[0089] The second separator 3 receives the mixed gas and separates droplets in the mixer with a particle size larger than a set diameter to output dechlorinated air.

[0090] Specifically, high-pressure chlorinated air from the underground salt cavern gas storage tank is introduced into the first separator 1. The chlorinated air passes through a primary separator to remove droplets and solid impurities with a particle size larger than a set diameter. The primary dechlorinated gas output from the first separator 1 is introduced into the mixer 2. The controller controls the atomizing pump 5 to atomize the mixed solution in the first storage tank 4 and spray it into the mixer 2. The primary dechlorinated gas and the atomized droplets are fully mixed in the mixer 2 to form a mixed gas, allowing the smaller chlorine-containing droplets in the primary dechlorinated gas to dissolve into the atomized droplets. The mixed gas is then introduced into the second separator 3. The mixed gas is first coarsely filtered through the first coupling separator 32, and then finely filtered through the second coupling separator 33 to form dechlorinated air. The dechlorinated air is output from the second separator 3 to the subsequent power generation system.

[0091] The dechlorination system using the salt cavern compressed air energy storage described above dechlorinates the compressed air stored in the salt cavern. The first separator 1, the mixer 2, and the second separator 3 are matched to perform multi-stage dechlorination of the compressed air. The primary dechlorinated gas is mixed with atomized droplets in the mixer 2, which can reduce the chloride ion concentration of chlorine-containing droplets in the compressed air, thereby reducing the corrosiveness of the dechlorinated gas discharged from the second separator 3.

[0092] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0093] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dechlorination system for compressed air energy storage in salt caverns, characterized in that, It includes a first separator (1), a mixer (2), a second separator (3), a first liquid storage tank (4), and an atomizing pump (5); The first separator (1), the mixer (2) and the second separator (3) are connected in sequence. The first liquid storage tank (4) is connected to the mixer (2) through the atomizing pump (5). The atomizing pump (5) is used to drive the liquid in the first liquid storage tank (4) to spray into the mixer (2) and form atomized droplets with a particle size larger than a set diameter in the mixer (2). The first separator (1) is provided with an air inlet for chlorine-containing air to enter. The first separator (1) can separate droplets in the chlorine-containing air with a particle size larger than the set diameter to output primary dechlorination gas. The primary dechlorination gas can be introduced into the mixer (2) and mixed with the atomized droplets to form a mixed gas. The mixed gas can be introduced into the second separator (3). The second separator (3) can separate droplets in the mixed gas with a particle size larger than the set diameter to output dechlorinated air. The first storage tank (4) stores a mixed solution, which includes ethylene glycol and softened water; The first separator (1) includes a first housing and a primary separator, the primary separator including a cyclone separator element or a multi-layer filter screen; The second separator (3) includes a second housing (31), a first coupling separator (32), and a second coupling separator (33); The first coupling separator (32) is a cyclone separator, and the second coupling separator (33) includes a fiber coalescing filter element; During its movement, the mixed gas passes sequentially through the first coupling separator (32) and the second coupling separator (33).

2. The dechlorination system for salt cavern compressed air energy storage according to claim 1, characterized in that, The atomizing pump (5) includes a drive pump (51) and an atomizing nozzle (52). The atomizing nozzle (52) is connected to the inner cavity of the mixer (2). The atomizing nozzle (52) has an opening with a diameter larger than the set diameter. The drive pump (51) is connected between the first liquid storage tank (4) and the atomizing nozzle (52). The drive pump (51) can drive the liquid in the first liquid storage tank (4) to be sprayed into the interior of the mixer (2) through the opening of the atomizing nozzle (52).

3. The dechlorination system for salt cavern compressed air energy storage according to claim 1, characterized in that, The first housing has an air inlet at the bottom and an air outlet at the top. The air outlet is connected to the mixer (2) via a pipe. The primary separator is located inside the first housing. The chlorine-containing air is separated into the primary dechlorination gas, the first residual liquid, and solid impurities by passing through the primary separator.

4. The dechlorination system for salt cavern compressed air energy storage according to claim 1, characterized in that, The first coupling separator (32) and the second coupling separator (33) are disposed inside the second housing (31). The bottom of the second housing (31) is provided with a vent, and the top of the second housing (31) is provided with an exhaust port for the dechlorinated air to be discharged. The vent is connected to the mixer (2). The first coupling separator (32) is located on the lower side of the second separator (3), and the second coupling separator (33) is located on the upper side of the second separator (3). The droplet size that the first coupling separator (32) can separate is larger than the droplet size that the second coupling separator (33) can separate. The mixed gas passes through the first coupling separator (32) and the second coupling separator (33) in sequence to remove droplets with a particle size larger than the set diameter to output dechlorinated air.

5. The dechlorination system for salt cavern compressed air energy storage according to claim 1, characterized in that, The dechlorination system for compressed air energy storage in the salt cavern also includes a second liquid storage tank (6), which is connected to the second separator (3). The mixed gas can be separated in the second separator (3) to form the dechlorinated air and the second residual liquid, and the second residual liquid can be introduced into the second liquid storage tank (6).

6. The dechlorination system for salt cavern compressed air energy storage according to claim 1, characterized in that, The mixer (2) includes a cylindrical structure, the interior of which forms a mixing chamber. The cylindrical structure is arranged in a horizontal direction, and the two ends of the cylindrical structure are respectively connected to the first separator (1) and the second separator (3) through pipes. The cylindrical structure has a spray port in the middle that communicates with the mixing chamber. The spray port is located at one end of the cylindrical structure near the first separator (1). The first liquid storage tank (4) is connected to the spray port through the atomizing pump (5).

7. The dechlorination system for salt cavern compressed air energy storage according to claim 1, characterized in that, The dechlorination system for compressed air energy storage in the salt cavern also includes a controller. The first separator (1) is equipped with a detector, which is used to detect the air pressure entering the first separator (1). The controller is connected to the detector and the atomizing pump (5). The controller controls the atomizing pump (5) according to the detection data of the detector, so that when the air pressure in the first separator (1) increases, the pressure of the liquid in the first storage tank (4) entering the mixer (2) increases synchronously; when the air pressure in the first separator (1) decreases, the pressure of the liquid in the first storage tank (4) entering the mixer (2) decreases synchronously.

8. The dechlorination system for salt cavern compressed air energy storage according to claim 7, characterized in that, The controller controls the power of the atomizing pump (5) according to the data of the detector, so that the pressure of the liquid in the first storage tank (4) when it enters the mixer (2) is greater than the pressure in the first separator (1).

9. A method for dechlorination of compressed air energy storage in salt caverns, characterized in that, The dechlorination system applied to the salt cavern compressed air energy storage as described in any one of claims 1 to 8 comprises the following steps: Chlorine-containing air is introduced into the first separator (1), which separates droplets with a particle size larger than a set diameter from the chlorine-containing air to output primary dechlorination gas; The atomizing pump (5) drives the liquid in the first storage tank (4) to spray into the mixer (2), and forms atomized droplets with a particle size larger than a set diameter in the mixer (2). The mixer (2) receives the primary dechlorination gas, and the primary dechlorination gas mixes with the atomized droplets to form a mixed gas. The second separator (3) receives the mixed gas and separates droplets in the mixer that have a particle size larger than the set diameter to output dechlorinated air.

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