A compressed air energy storage and concentrated salt wastewater evaporation collaborative treatment system and treatment method

Abstract

The application discloses a compressed air energy storage and concentrated salt wastewater evaporation collaborative treatment system and method, and relates to the technical field of energy saving and environmental protection.The compressed air energy storage and concentrated salt wastewater evaporation collaborative treatment system comprises a compressed air energy storage system and an evaporation treatment system; the compressed air energy storage system comprises an expander set; the evaporation treatment system comprises an evaporation device; concentrated salt wastewater to be treated is introduced into the evaporation device; the exhaust gas of the expander set is introduced into the evaporation device; and the exhaust gas of the expander is used to treat the concentrated salt wastewater in the evaporation device.The compressed air energy storage and concentrated salt wastewater evaporation collaborative treatment system solves the technical problem of high concentrated salt wastewater treatment cost in the existing compressed air energy storage system, and has the technical effect of realizing zero discharge of concentrated salt wastewater at low cost.

Description

Technical Field

[0001] This invention relates to the field of energy conservation and environmental protection technology, and in particular to a system and method for the synergistic treatment of compressed air energy storage and concentrated saline wastewater evaporation. Background Technology

[0002] Compressed air energy storage systems contain a large water circulation system. The cold source for this system is the cooling tower, and the circulating water is typically demineralized water. Demineralized water is water that has been treated to remove most of the dissolved salts, minerals, and ions; it has extremely low conductivity and high purity. Using demineralized water in cooling towers effectively prevents scale buildup and reduces the risk of corrosion.

[0003] In the process of developing this invention, the inventors discovered at least the following problems in the prior art: Since the working principle of a cooling tower is evaporation and concentration, the evaporation process carries away pure water, leaving behind demineralized water that becomes concentrated salt wastewater. Existing systems require the design of reasonable wastewater discharge strategies to properly treat the generated concentrated salt wastewater, resulting in high overall costs for achieving zero discharge of concentrated salt wastewater. Summary of the Invention

[0004] The purpose of this invention is to provide a low-cost system and method for the synergistic treatment of compressed air energy storage and concentrated saline wastewater evaporation to achieve zero discharge of concentrated saline wastewater.

[0005] To achieve this objective, a system for the coordinated treatment of concentrated saline wastewater by compressed air energy storage and evaporation is provided. This system includes a compressed air energy storage system and an evaporation treatment system. The compressed air energy storage system includes an expander; the evaporation treatment system includes an evaporation device. The concentrated saline wastewater to be treated is introduced into the evaporation device, and the exhaust gas from the expander is also introduced into the evaporation device. The exhaust gas from the expander is dry air with extremely low relative humidity, which can absorb a large amount of water from the concentrated saline wastewater upon contact. After treatment by the evaporation device, the exhaust gas is discharged as humid air, and the concentrated saline wastewater is discharged as salt residue, thus separating the concentrated saline wastewater.

[0006] Furthermore, the evaporator is equipped with a concentrated brine wastewater inlet at the top, through which the concentrated brine wastewater to be treated enters the evaporator. An air inlet is located at the bottom of the evaporator, through which the exhaust gas from the expander enters the evaporator. Since the concentrated brine wastewater has a larger mass and the exhaust gas has a smaller mass, the concentrated brine wastewater enters from the top of the evaporator, while the exhaust gas enters from the bottom. The masses of both materials combine and react within the evaporator.

[0007] Furthermore, the evaporator is equipped with a packing layer where concentrated brine wastewater reacts with the exhaust gas from the expander. The downward-sprayed concentrated brine wastewater meets and reacts with the rising exhaust gas at the packing layer. The packing layer contains packing material that provides a larger specific surface area, allowing for sufficient contact between the gas and liquid phases and promoting mass and heat transfer between the concentrated brine wastewater and the exhaust gas.

[0008] Furthermore, the evaporation treatment system also includes a concentrated brine wastewater heating device to increase the temperature of the concentrated brine wastewater entering the evaporation unit. Increasing the temperature of the concentrated brine wastewater entering the evaporation unit improves evaporation efficiency.

[0009] Furthermore, the compressed air energy storage system includes a compressor for compressing air. After the air is compressed by the compressor, its temperature rises, generating heat of compression. The heat source of the heating device comes from the heat of compression.

[0010] Furthermore, the heating device is a heat exchanger, with the hot side inlet of the heat exchanger being compression heat, the cold side inlet of the heat exchanger being concentrated brine wastewater, and the cold side outlet of the heat exchanger being the heated concentrated brine wastewater.

[0011] Furthermore, the evaporator is equipped with heat exchange components to increase the temperature inside the evaporator cavity, thereby increasing the evaporation efficiency.

[0012] Furthermore, the compressed air energy storage system includes a compressor for compressing air. After the air is compressed by the compressor, its temperature rises, generating heat of compression. The heat source for the heat exchange components in the evaporator comes from the heat of compression.

[0013] Furthermore, the compressed air energy storage system also includes a heat tank, in which the heat of compression is stored through a heat exchange medium, and the heat exchange components in the heating device or evaporation device utilize the heat in the heat tank.

[0014] Furthermore, the top of the evaporation device is equipped with a sprayer for spraying the concentrated salt wastewater to be treated, and the bottom of the evaporation device is equipped with a liquid level monitoring device located below the exhaust gas inlet of the expander. The liquid level monitoring device controls the spraying volume of the sprayer.

[0015] On the other hand, a system for the coordinated treatment of compressed air energy storage and concentrated brine wastewater evaporation is also provided. The exhaust gas from the expander in the compressed air energy storage system is introduced into the evaporation device, and the concentrated brine wastewater to be treated is introduced into the evaporation device. In the evaporation device, the exhaust gas from the expander comes into contact with and reacts with the concentrated brine wastewater, turning the concentrated brine wastewater into salt residue and the exhaust gas into humid air.

[0016] Furthermore, a liquid level monitoring device is installed at the bottom of the inner cavity of the evaporator; when the liquid level monitoring device detects that the liquid level is H1, the inlet of concentrated brine wastewater is closed; when the liquid level monitoring device detects that the liquid level has dropped to H2, the outlet of humid air and the outlet of salt residue are opened, where H2 is less than H1.

[0017] One of the above technical solutions has the following advantages or beneficial effects: it utilizes the exhaust gas from an expander to treat concentrated saline wastewater through evaporation, achieving zero wastewater discharge and significantly reducing sewage discharge costs. Attached Figure Description

[0018] Figure 1 This is the compressed air energy storage and concentrated saline wastewater evaporation co-treatment system provided in Example 1; Figure 2 It is the evaporation apparatus of Example 1; Figure 3 This is the compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system provided in Example 2; Figure 4 This is the evaporation apparatus of Example 2; Figure 5 This is the compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system provided in Example 3; Figure 6 This is another compressed air energy storage and concentrated salt wastewater evaporation co-treatment system provided in Example 3.

[0019] In the diagram: 100 - Compressed air energy storage system; 111 - First-stage compressor; 112 - Compressor; 113 - Last-stage compressor; 120 - Air storage tank; 130 - Regenerative heat exchanger; 140 - Hot water tank; 151 - Expander; 152 - Last-stage expander; 161 - Cooling tower; 162 - Demineralized water station; 170 - Blower; 180 - Cold water tank; 190 - Reheat heat exchanger; 200 - Evaporation treatment system; 210 - Evaporation unit; 211 - Concentrated brine wastewater inlet; 212 - Sprayer; 213- Spray pipe; 214- Air inlet; 215- Slag outlet; 216- Air outlet; 217- Aggregate bin; 218- Packing layer; 219- Liquid level monitoring device; 250- Heat exchange component; 251- Inlet pipe of heat exchange component; 252- Outlet pipe of heat exchange component; 260- Washing tank; 261- Sewage treatment tank; 220- Heating device; 230- Filter press; 240- Gas-solid separator; 270- Condenser; 280- Gas-liquid separator. Detailed Implementation

[0020] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0021] Example 1: like Figures 1-2 As shown, this embodiment provides a compressed air energy storage and concentrated brine wastewater evaporation co-treatment system, including a compressed air energy storage system 100. The compressed air energy storage system can be divided into an energy storage unit and an energy release unit. When the power grid has abandoned power or needs energy storage, the energy storage unit is activated. When the plant area needs to use electricity, the energy release unit is activated.

[0022] The energy storage unit includes a compressor unit and a regenerative heat exchanger assembly for recovering compression heat. The compressor unit uses surplus electricity to compress air into high-pressure air. The compressor unit includes at least one stage of compressors 111, 112, and 113 connected in series. The inlet of the first-stage compressor 111 is connected to the incoming air. After compression, the outlet of the last-stage compressor 113 is connected to the inlet of the air storage tank 120, storing the surplus electricity as high-pressure air within the storage tank. Each compressor's outlet is equipped with a regenerative heat exchanger 130, which recovers the compression heat into a heat tank 140. This heat can be used to heat the compressed air during energy release. To cope with extreme conditions, the heat tanks in the current compressed air energy storage system are designed with a capacity surplus.

[0023] When the plant needs electricity, the energy release unit is activated. The energy release unit includes an expander unit and a reheat heat exchanger assembly. The expander unit uses compressed air from the gas storage tank to generate electricity. The expander unit includes at least one stage of expanders 151 connected in series. Before entering the expander, the compressed air from the gas storage tank is heated by a reheat heat exchanger 190. The hot-side inlet of the reheat heat exchanger is connected to the outlet of the hot tank. During energy release, the compressed air entering the expander is heated by the high-temperature working fluid in the hot tank through the reheat heat exchanger. The hot-side outlet of the reheat heat exchanger is connected to the inlet of the cold tank, storing the cold air in the cold tank 180. The cold-side outlet of the reheat heat exchanger is connected to the inlet of the expander. The expander unit uses the heated compressed air to expand and generate electricity. The low-pressure, low-temperature gas after the expander unit performs work and reduces pressure is the exhaust gas of the expander unit, which is the tail gas of the final expander 152 within the expander unit. The exhaust gas is clean, low-pressure air and can be directly discharged into the atmosphere.

[0024] The compressed air energy storage system also includes a water circulation system. The main function of the water circulation system is to cool the lubricating oil and / or coolant in equipment such as the compressor unit, expander unit, engine, and motor. The cold source for the water circulation system is the cooling tower 161, and the circulating water in the water circulation system is demineralized water, which is stored in the demineralized water station 162.

[0025] The compressed air energy storage and concentrated brine wastewater evaporation co-treatment system also includes an evaporation treatment system 200, which includes an evaporation unit 210. The concentrated brine wastewater to be treated is introduced into the evaporation unit 210, and the exhaust gas from the expander is introduced into the evaporation unit. The exhaust gas from the expander is used to treat the concentrated brine wastewater within the evaporation unit. The exhaust gas from the expander is low-pressure air with extremely low relative humidity and extremely low enthalpy. Upon contact with the concentrated brine wastewater, this low-enthalpy exhaust gas can absorb a large amount of water from the wastewater. After the exhaust gas and concentrated brine wastewater react within the evaporation unit, the concentrated brine wastewater becomes salt residue, and the exhaust gas becomes humidified air.

[0026] Furthermore, the outlet of the last stage expander of the expander unit is equipped with a waste gas pipeline. This waste gas pipeline includes a first branch, which connects to the air inlet of the evaporator. The waste gas pipeline also includes a second branch, which connects to the atmosphere and serves as a vent pipe. Optionally, a blower 170 for adjusting the flow rate of the waste gas is installed on the first branch of the waste gas pipeline. A vent valve is installed on the second branch of the waste gas pipeline. The opening degree of the vent valve is determined according to the amount of waste gas required by the evaporator; when the evaporator can absorb all the waste gas, the vent valve can be closed.

[0027] Furthermore, the upper part of the evaporator is provided with a concentrated brine wastewater inlet 211, through which the concentrated brine wastewater to be treated enters the evaporator. The lower part of the evaporator is provided with an air inlet 214, through which the exhaust gas from the expander unit enters the evaporator. Optionally, the lower part of the evaporator is provided with two air inlets, which are symmetrically arranged to improve the uniformity of air intake. Optionally, the concentrated brine wastewater to be treated is collected in a wastewater treatment tank 261. A sprayer 212 for spraying the concentrated brine wastewater to be treated is provided at the top of the inner cavity of the evaporator. A spray pipe 213 passes through the evaporator, and the concentrated brine wastewater inlet is a through hole through which the spray pipe passes in the wall of the evaporator. One end of the spray pipe is connected to the sprayer, and the other end of the spray pipe leads into the wastewater treatment tank. A circulation pump is provided on the spray pipe to provide power for this circulation. Inside the cavity of the evaporator, the concentrated brine wastewater is sprayed by the sprayer. The air inlet of the evaporator is located below the inlet of the concentrated brine wastewater, and the exhaust gas from the expander unit is introduced into the evaporator from the bottom. The downward-sprayed concentrated brine wastewater meets and reacts with the rising exhaust gas inside the evaporator chamber.

[0028] Furthermore, the evaporation unit also includes a slag outlet 215 and a gas outlet 216. The slag outlet is located at the bottom of the evaporation unit, and the gas outlet is located at the top. After the concentrated brine wastewater and exhaust gas react within the evaporation unit, solid salt residue precipitates out and collects under gravity in the collection bin 217 at the bottom of the evaporation unit. Below the collection bin 217 is the slag outlet, from which the solid salt residue is discharged from the evaporation unit. The exhaust gas from the expander is converted into more humid air and discharged from the outlet.

[0029] Furthermore, the evaporator is equipped with a packing layer 218, where concentrated brine wastewater reacts with the exhaust gas from the expander unit. The downward-sprayed concentrated brine wastewater meets and reacts with the rising exhaust gas at the packing layer. The packing layer contains packing material that provides a larger specific surface area, allowing for sufficient contact between the gas and liquid phases and promoting mass and heat transfer between the concentrated brine wastewater and the exhaust gas. The packing material can be ultra-high efficiency packing materials such as wire mesh corrugated packing, micro-mixed packing, or SQ-type hyperbolic corrugated packing, with a specific surface area of ​​500-1200 m² / m³.

[0030] Furthermore, the evaporation treatment system also includes a concentrated brine wastewater heating device 220, which raises the temperature of the concentrated brine wastewater entering the evaporation device. After the concentrated brine wastewater is heated, it reacts with the exhaust gas, thus increasing the evaporation reaction rate. Optionally, the heating device can be an electric heater, which further increases the reaction rate of the concentrated brine wastewater in contact with the exhaust gas, thereby improving the evaporation efficiency.

[0031] Preferably, the heat source for the heating device comes from the heat of compression of a compressed air energy storage system. The compressed air energy storage system includes a compressor unit for compressing air. After the air is compressed by the compressor unit, its temperature rises, generating heat of compression, which is stored in a heat tank. The heat tank in the compressed air energy storage system is designed with redundancy; when this portion of the heat is not used, it becomes waste heat of the system.

[0032] Furthermore, the heating device is a heat exchanger. The hot-side inlet of the heat exchanger receives compression heat, the cold-side inlet receives concentrated brine wastewater, and the cold-side outlet receives the heated concentrated brine wastewater. The cold-side inlet of the heat exchanger is connected to the wastewater treatment tank, and the cold-side outlet is connected to the spray pipe. The hot-side inlet of the heat exchanger is connected to the outlet of the hot tank, and the hot-side outlet receives low-grade heat, which can be used for domestic heating in the factory's living and office buildings, such as for heating and hot water supply.

[0033] Furthermore, a liquid level monitoring device 219 is installed at the bottom of the evaporator, located below the exhaust gas inlet of the expander unit. The liquid level monitoring device controls the spray volume of the sprayer. Optionally, the liquid level monitoring device is installed in the collection bin 217 at the bottom of the evaporator cavity.

[0034] Furthermore, the evaporation treatment system also includes a filter press 230, which is connected to the slag outlet 215 of the evaporation unit 210. The filter press 230 separates the mixture of concentrated brine wastewater and solid salt residue from the slag outlet 215 into solid salt residue filter cake and concentrated brine wastewater. The solid salt residue filter cake is subjected to solid waste safety treatment, while the concentrated brine wastewater is returned to the wastewater treatment pond. The filter press can be a plate and frame filter press or a diaphragm filter press.

[0035] Furthermore, the evaporation treatment system also includes a gas-solid separator 240. The inlet of the gas-solid separator 240 is connected to the outlet of the evaporation device. When the gas after evaporation may contain micro-solid salt residue, it is separated by the gas-solid separator 240. The solid salt residue located at the bottom of the gas-solid separator is collected and discharged, while the gas is humid air, which is discharged into the atmosphere from the outlet of the gas-solid separator. Optionally, the gas-solid separator is a cyclone dust collector.

[0036] This embodiment also provides a method for the coordinated treatment of compressed air energy storage and concentrated salt evaporation. The process for treating concentrated salt wastewater is as follows: when the evaporator 210 is shut down, the air inlet, concentrated salt wastewater inlet, air outlet, and slag outlet of the evaporator are all closed. When concentrated salt wastewater is generated in the system, it is collected into a wastewater treatment pond.

[0037] When there is a high-temperature working fluid in the hot tank of the compressed air energy storage system, or when the compressed air energy storage system releases energy and there is exhaust gas at the outlet of the expander unit, the concentrated brine wastewater heating device 220 is turned on to heat the concentrated brine wastewater entering the evaporator.

[0038] When the compressed air energy storage system releases energy, after exhaust gas is present at the outlet of the expander unit, the air inlet 214 and sprayer 212 of the evaporator 210 are opened, introducing exhaust gas and concentrated brine wastewater to be treated into the evaporator 210. When the liquid level monitoring device 219 at the bottom of the evaporator cavity detects a liquid level of H1, it sends a signal to the control device to close the sprayer. The exhaust gas and the concentrated brine wastewater to be treated begin to react within the evaporator 210.

[0039] When the liquid level monitoring device 219 at the bottom of the evaporator 210 detects that the liquid level has dropped to H2 (H2 is less than H1), it sends a signal to the control device to open the air outlet 214 of the evaporator 210 to discharge humid air and the slag outlet 215 to discharge salt slag. The reacted solid salt slag falls into the collection bin 217 and mixes with the concentrated salt wastewater in the collection bin 217. Since the concentrated salt wastewater is saturated brine, the reacted solid salt slag is incompatible with the concentrated salt wastewater, and the mixture of concentrated salt wastewater and solid salt slag is discharged from the slag outlet. After the mixture is emptied, the slag outlet 215 and the air outlet 216 are closed, and the sprayer 212 is turned on again to start the next evaporation reaction. The mixture of concentrated salt wastewater and solid salt slag discharged from the slag outlet 215 is processed by the filter press 230 to become concentrated salt wastewater and solid salt slag filter cake. The solid salt slag filter cake can be safely disposed of, and the concentrated salt wastewater is returned to the sewage treatment pond.

[0040] In this embodiment, the bottom of the evaporation device 210 contains a certain amount of concentrated salt wastewater, which ensures that there is a sufficient amount of exhaust gas to contact and react with the concentrated salt wastewater during each evaporation. After each evaporation is completed, due to the sufficient amount of exhaust gas in the evaporation device, the liquid level of the concentrated salt wastewater (including solid salt residue) at the bottom of the evaporation device 210 will also decrease. When it decreases to a certain value, it indicates that all the concentrated salt wastewater in the evaporation device 210 has reacted.

[0041] Therefore, the compressed air energy storage and concentrated saline wastewater evaporation co-treatment system provided in this embodiment utilizes the exhaust gas from the expander as waste gas to treat concentrated saline wastewater, achieving zero wastewater discharge and reducing sewage discharge costs.

[0042] Example 2: like Figures 3-4 This embodiment provides a system for the coordinated treatment of compressed air energy storage and concentrated brine wastewater evaporation. The parts identical to those in Embodiment 1 will not be repeated. Unlike Embodiment 1, the evaporator also includes a heat exchange component 250 for increasing the temperature inside the evaporator cavity. In this embodiment, the concentrated brine wastewater heating device located outside the evaporator as described in Embodiment 1 can be omitted or included simultaneously.

[0043] In this embodiment, the concentrated brine wastewater to be treated is heated inside the evaporator. Optionally, a heat exchange component 250 is also provided inside the evaporator to increase the temperature inside the evaporator chamber, thereby improving evaporation efficiency. Inside the evaporator, the exhaust gas from the expander unit enters from below, and the concentrated brine wastewater enters from the sprayer above. The heat exchange component 250 located inside the evaporator chamber can heat either the exhaust gas from the expander unit entering from below or the concentrated brine wastewater sprayed from above, depending on the position of the heat exchange component.

[0044] Optionally, plate heat exchangers can be used as the heat exchange components in the evaporation unit. The plate heat exchangers are made of corrosion-resistant stainless steel. Optionally, the plates of the plate heat exchanger are installed at an angle to facilitate liquid film flow. Optionally, the heat exchange components in the evaporation unit can be arranged modularly, meaning that the heat exchange components in the evaporation unit can be partially opened.

[0045] Optionally, the heat for the heat exchange component can come from the heat of compression in the compressed air energy storage system, specifically from the heat tank within the compressed air energy storage system. The inlet pipe 251 and outlet pipe 252 of the heat exchange component pass through the wall of the evaporator. The inlet pipe 251 of the heat exchange component is connected to the outlet of the heat tank, and the outlet pipe 252 contains low-grade heat, which can be used for domestic heating in the factory's living and office buildings.

[0046] Optionally, when a packing layer 218 is provided inside the evaporator, the packing layer 218 is positioned above the heat exchange component 250. In this embodiment, the heating device inside the evaporator is used to heat the exhaust gas from the expander, resulting in higher efficiency in the reaction between the high-temperature exhaust gas and the concentrated brine wastewater.

[0047] Furthermore, the concentrated brine wastewater evaporation system also includes a self-cleaning system for cleaning the internal equipment of the evaporator. The self-cleaning system includes a cleaning tank 260, which is connected to the spray pipe 213 of the evaporator. After the evaporator 210 has been running for a certain period, the cleaning valve is opened, and cleaning liquid enters the spray pipe to spray and clean the inside of the evaporator, preventing blockage of the heat exchange components 250 within the evaporator. Optionally, hydrochloric acid cleaning liquid can be used.

[0048] The method for co-processing compressed air energy storage and concentrated salt evaporation in this embodiment is the same as that in Embodiment 1, and will not be repeated here. The difference from Embodiment 1 is that when there is a high-temperature working fluid in the hot tank of the compressed air energy storage system, or when the compressed air energy storage system releases energy and there is exhaust gas at the outlet of the expander unit, the inlet pipe 251 of the heat exchange component is opened to introduce the heat source into the heat exchange component in the evaporation device.

[0049] After the evaporator has been running for a certain period of time (Tmax), the self-cleaning system is activated after the current processing cycle is completed. When self-cleaning is required, the air inlet and slag outlet are closed before the self-cleaning is activated. The cleaning liquid is sprayed into the evaporator chamber through a sprayer to clean the heat exchange components.

[0050] Example 3: like Figures 5-6 As shown, this embodiment also provides a system for the coordinated treatment of compressed air energy storage and concentrated saline wastewater evaporation. The parts that are the same as those in Embodiment 1 and / or Embodiment 2 will not be described again.

[0051] In this embodiment, the evaporation system also includes a condenser 270 and a gas-liquid separator 280. The condenser 270 is located at the outlet of the evaporation device, and the gas-liquid separator 280 is located downstream of the condenser 270. The humid air flowing out of the evaporation device outlet is condensed by the condenser, causing water to separate. The separated water then enters the gas-liquid separator to separate the gas and water. The gas can be directly discharged into the atmosphere, while the water can be collected and used in a circulating water system, such as the circulating water system within a compressed air energy storage system. When the air at the outlet of the evaporation device has a high moisture content, this water can be separated through the condenser heat exchanger and the gas-liquid separator. The separated pure water can be used as the circulating working fluid in the circulating water system, further improving wastewater utilization.

[0052] Furthermore, the condenser uses a water-cooled condensing heat exchanger. The hot-side inlet of the water-cooled condensing heat exchanger is connected to the outlet of the gas-solid separator, and the cold side of the water-cooled condensing heat exchanger has a cold source. The hot-side outlet of the water-cooled condensing heat exchanger is connected to the inlet of the gas-liquid separator. After the gas containing water enters the gas-liquid separator and is separated, the gas is directly discharged, and the liquid is pure water, which can be returned to the demineralized water station. Optionally, the cold source of the water-cooled condensing heat exchanger uses a cooling tower within a compressed air energy storage system. The outlet of the cooling tower is connected to the cold-side inlet of the water-cooled condensing heat exchanger, and the cold-side outlet of the water-cooled condensing heat exchanger is connected to the return liquid port of the cooling tower.

[0053] Alternatively, an air-cooled condensing heat exchanger can be used as the condenser. The cold side of the air-cooled condensing heat exchanger relies on natural convection or forced convection for heat exchange with the atmosphere.

[0054] Alternatively, a cyclone separator can be used as the gas-liquid separator.

[0055] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A system for the synergistic treatment of compressed air energy storage and concentrated saline wastewater evaporation, characterized in that, Includes compressed air energy storage systems and evaporation treatment systems; Compressed air energy storage systems include expanders; The evaporation treatment system includes an evaporation device. The concentrated saline wastewater to be treated is fed into the evaporation device, and the exhaust gas from the expander is also fed into the evaporation device. The concentrated saline wastewater is treated in the evaporation device using the exhaust gas from the expander.

2. The compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system according to claim 1, characterized in that, The upper part of the evaporator is equipped with a concentrated brine wastewater inlet, through which the concentrated brine wastewater to be treated is introduced into the evaporator. The lower part of the evaporator is equipped with an air inlet, through which the exhaust gas from the expander is introduced into the evaporator.

3. The system for synergistic treatment of compressed air energy storage and concentrated saline wastewater evaporation according to claim 1, characterized in that, The evaporation unit is equipped with a packing layer, where concentrated brine wastewater reacts with the exhaust gas from the expander.

4. The compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system according to claim 1, characterized in that, The evaporation treatment system also includes a concentrated brine wastewater heating device, which increases the temperature of the concentrated brine wastewater entering the evaporation device.

5. The compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system according to claim 4, characterized in that, The compressed air energy storage system includes a compressor for compressing air. After the air is compressed by the compressor, its temperature rises and generates heat of compression. The heat source of the heating device comes from the heat of compression.

6. The compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system according to claim 5, characterized in that, The heating device is a heat exchanger. The hot side inlet of the heat exchanger is the heat of compression, the cold side inlet of the heat exchanger is concentrated brine wastewater, and the cold side outlet of the heat exchanger is the heated concentrated brine wastewater.

7. The compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system according to claim 1, characterized in that, The evaporator is equipped with heat exchange components to increase the temperature inside the cavity.

8. The compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system according to claim 7, characterized in that, The compressed air energy storage system includes a compressor for compressing air, which generates heat of compression as the air is compressed and its temperature rises; the heat source for the heat exchange components in the evaporator comes from the heat of compression.

9. A system for the synergistic treatment of compressed air energy storage and concentrated saline wastewater evaporation according to claim 5 or claim 8, characterized in that, The compressed air energy storage system also includes a heat tank, in which the heat of compression is stored through a heat exchange medium, and the heat exchange components in the heating or evaporation device utilize the heat in the heat tank.

10. The compressed air energy storage and concentrated saline wastewater evaporation synergistic treatment system according to claim 2, characterized in that, The top of the evaporation device is equipped with a sprayer for spraying concentrated salt wastewater to be treated, and the bottom of the evaporation device is equipped with a liquid level monitoring device located below the exhaust gas inlet of the expander. The liquid level monitoring device controls the spraying volume of the sprayer.

11. A method for the synergistic treatment of compressed air energy storage and concentrated saline wastewater evaporation, characterized in that, The exhaust gas from the expander in the compressed air energy storage system is fed into the evaporation device, and the concentrated salt wastewater to be treated is fed into the evaporation device. Inside the evaporation unit, the exhaust gas from the expander comes into contact with and reacts with the concentrated brine wastewater, turning the concentrated brine wastewater into salt residue and the exhaust gas into humid air.

12. The method for synergistic treatment of compressed air energy storage and concentrated saline wastewater evaporation according to claim 11, characterized in that, A liquid level monitoring device is installed at the bottom of the inner cavity of the evaporator; When the liquid level monitoring device detects a liquid level of H1, the inlet of the concentrated brine wastewater is closed; When the liquid level monitoring device detects that the liquid level has dropped to H2, the outlet for humid air and the outlet for salt residue are opened, and H2 is less than H1.

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