Cooling and dewatering device and compressed air energy storage system

Abstract

The invention provides a cooling and dewatering device and a compressed air energy storage system using the same. A cooler and a gas-liquid separator on the compression side of an existing multi-section compressed air energy storage system are replaced by the cooling and dewatering device for the compressed air energy storage system. The cooling and dewatering device adopts a low-temperature water direct cooling method, has cooling and dewatering functions, and can quickly reduce the temperature of the high-temperature compressed air to be below the dew point temperature, so that water vapor in the compressed air is condensed and separated out, the moisture content of the compressed air is reduced, and the corrosion rate of equipment is delayed. Compared with an existing system, economic loss and early-stage construction investment caused by equipment corrosion can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a cooling and dehydrating device and a compressed air energy storage system using the cooling and dehydrating device. Background Art

[0002] At present, my country's energy consumption structure is gradually changing from an energy consumption structure dominated by fossil energy to an energy consumption structure dominated by new energy. Renewable energy represented by solar energy and wind energy is developing rapidly, but renewable power generation is affected by environmental and weather factors and has great randomness and volatility. In order to reduce the impact of large-scale renewable energy grid connection on the power grid, it is necessary to vigorously develop energy storage technology to reduce the impact of renewable energy grid connection.

[0003] In the existing technology, the compressed air energy storage system is one of the most mature physical energy storage technologies besides pumped storage. Compressed air energy storage has the advantages of long energy storage time, large energy storage capacity, and high energy storage efficiency. The compressed air energy storage system is mainly composed of compression system, heat exchange system, heat storage system, gas storage system, turbine expansion system and other subsystems.

[0004] Figure 1 is a schematic diagram of a compressed air energy storage system in the prior art, such as Figure 1 As shown, the compressed air energy storage system in the prior art includes at least one or more compression sections consisting of a compressor, a heat exchanger, a first gas-liquid separator, a cooler, and a second gas-liquid separator connected in sequence by compressed air pipelines, and an air storage reservoir connected to the second gas-liquid separator.

[0005] The heat exchange system composed of a heat exchanger, a gas-liquid separator and a cooler is an important component of the compressed air energy storage system. It plays a vital role and accounts for a very large proportion of the investment. In the design and actual operation of the compressed air energy storage system, due to the consideration of the thermal balance of the entire system or the high air humidity, the outlet temperature of the heat exchanger and the outlet temperature of the cooler in the heat exchange system are often lower than the dew point temperature of the air under the corresponding pressure. This will cause water vapor in the compressed air to precipitate and condense on the inner wall of the heat exchanger and cooler, causing corrosion damage to the equipment and seriously affecting the service life of the equipment. This will seriously affect the stable operation of the entire compressed air energy storage system and cause huge economic losses such as equipment maintenance and replacement.

[0006] Therefore, in the design and application of compressed air systems, the condensation of water vapor in compressed air must be taken seriously. The moisture in compressed air mainly comes from the moisture contained in the atmosphere sucked in from the air inlet when the air compressor is working. The amount of water entering the compressed air system per unit time is related to the displacement of the air compressor, the ambient temperature of the inlet air, and the relative humidity of the humid air. The amount of condensed water generated by the compressed air in the subsequent heat exchanger and cooler is related to the pressure and temperature of the compressed air. Especially in the multi-stage compression process, the compressed air pressure continues to increase, and the dew point temperature of the compressed air continues to increase when the moisture content of the compressed air remains unchanged. During the heat exchange process, the compressed air temperature decreases. When the temperature is lower than the dew point temperature, the water content in the saturated humid air decreases, making it easier for water vapor to condense and precipitate. Summary of the invention

[0007] In view of the above problems, the present invention provides a cooling and dehydration device suitable for compressed air energy storage and a compressed air energy storage system using the cooling and dehydration device. The low-temperature water direct cooling method is used to quickly reduce the temperature of the compressed air to below the dew point temperature, so that the water vapor in the compressed air is quickly condensed, and the relative humidity and moisture content of the compressed air are reduced, as well as the dew point temperature of the compressed air during subsequent compression and heat exchange processes, thereby avoiding the precipitation of water vapor.

[0008] The first aspect of the present invention provides a cooling and water removal device, comprising: a shell; an opening arranged in the shell and introducing a compressed air inlet from external compressed air; an opening arranged in the shell and connected to the compressed air inlet through the inside of the shell with a compressed air outlet; an opening arranged in the shell and introducing a low-temperature water inlet from the outside; an opening arranged in the shell and connected to the low-temperature water inlet through the inside of the shell, wherein the temperature of the low-temperature water entering from the low-temperature water inlet is lower than the dew point temperature of the compressed air entering from the compressed air inlet, and the low-temperature water is in direct contact with the compressed air inside the shell.

[0009] According to the technical solution, compressed air enters the cooling and dehydrating device shell through the compressed air inlet, and is discharged through the inside of the shell connected to the compressed air outlet. Low-temperature water enters the cooling and dehydrating device shell through the low-temperature water inlet, and is discharged through the inside of the shell connected to the low-temperature water outlet. In the cooling and dehydrating device, the compressed air is fully in contact with low-temperature water whose temperature is lower than the dew point temperature of the compressed air, and the temperature is rapidly reduced to below the dew point temperature. The water vapor in the compressed air condenses and precipitates, so that the relative humidity and moisture content of the compressed air discharged from the shell decrease. This effectively avoids the problem in the prior art that the outlet temperature of the heat exchanger is lower than the dew point temperature of the compressed air under the corresponding pressure, causing the water vapor in the compressed air to precipitate and condense on the inner wall of the heat exchanger and cooler, resulting in corrosion damage to the equipment, which seriously affects the service life of the equipment.

[0010] The optional technical solution also includes: a sprayer is provided inside the shell between the low-temperature water inlet and the low-temperature water outlet, and the low-temperature water from the low-temperature water inlet is directly in contact with the compressed air after being sprayed out from the sprayer.

[0011] According to the technical solution, after the low-temperature water enters the shell through the low-temperature water inlet, it diffuses to the bottom of the shell through the sprinkler, and countercurrently exchanges heat with the high-temperature compressed air entering the shell from the compressed air inlet, rapidly reducing the temperature of the compressed air to below the dew point temperature, and the water vapor in the compressed air condenses and precipitates. The low-temperature water is brought into contact with the compressed air in the form of mist through the sprinkler, which can not only further reduce the temperature of the low-temperature water through the throttling effect of the sprinkler, but also increase the contact area between the gas-liquid two phases, and strengthen the heat and mass transfer process between the low-temperature water and the compressed air.

[0012] In an optional technical solution, the cooling and water removal device also includes: a water collector arranged in the shell and located between the low-temperature water inlet and the sprayer, and a filler arranged in the shell and located between the sprayer and the low-temperature water outlet.

[0013] In an optional technical solution, the cooling and water removal device further includes: a water collector arranged in the shell and located between the filler and the low-temperature water outlet.

[0014] According to the technical solution, a water collector, a filler and a water collector are provided in the cooling and water removal device. The water collector is provided in the shell and between the low-temperature water inlet and the sprayer to intercept the droplets entrained in the compressed air flowing through the water collector, so that this part of water is separated from the compressed air and drips into the water collector. By providing a filler matching the cross-sectional shape of the water removal device in the cooling and water removal device, the low-temperature water droplets sprayed into the cooling and water removal device by the sprayer are broken to form a water film, thereby increasing the contact area between the gas and liquid phases and further strengthening the heat and mass transfer between the low-temperature water and the compressed air. At the same time, the low-temperature water after the heat exchange with the compressed air and the condensed water condensed in the compressed air are collected by the water collector, so that the low-temperature water after the heat exchange with the compressed air and the condensed water condensed in the compressed air flow out from the low-temperature water outlet.

[0015] In an optional technical solution, a compressed air inlet is correspondingly arranged in the space of the shell formed between the filler and the low-temperature water outlet; a compressed air outlet is correspondingly arranged in the space of the shell formed between the low-temperature water inlet and the sprinkler; a low-temperature water inlet is arranged at the top of the shell; and a low-temperature water outlet is arranged at the bottom of the shell.

[0016] According to the technical solution, a compressed air inlet and a low-temperature water outlet are provided at the bottom of the shell of the cooling and dewatering device, and a compressed air outlet and a low-temperature water inlet are provided at the top. Compressed air enters from the bottom of the shell of the cooling and dewatering device, flows to the top, and is discharged from the compressed air outlet provided at the top. Low-temperature water enters from the top of the shell of the cooling and dewatering device in the form of countercurrent to the compressed air, sprays to the bottom, and is discharged from the low-temperature water outlet provided at the bottom. When the compressed air and the low-temperature water flow in countercurrent, the high-temperature compressed air at the compressed air inlet and the low-temperature water at the low-temperature water outlet or in the water collector perform preliminary heat exchange, thereby improving the heat exchange efficiency of the cooling and dewatering device. At the same time, by making the compressed air and the low-temperature water flow in countercurrent, the low-temperature water in each part of the cooling and dewatering device is controlled to be always lower than the temperature of the compressed air, thereby further improving the heat exchange efficiency of the cooling and dewatering device.

[0017] In an optional technical solution, the sprayer further includes: a plurality of spray heads arranged at equal intervals in a manner of facing one side of the filler.

[0018] According to the technical solution, after the low-temperature water enters the cooling and dehydration device through the low-temperature water inlet, it diffuses to the bottom of the device in the form of mist through the nozzle, and countercurrently exchanges heat with the high-temperature compressed air from the compressed air inlet, rapidly reducing the temperature of the compressed air to below the dew point temperature, causing the water vapor in the compressed air to condense and precipitate. By arranging the nozzles at equal intervals, the low-temperature water sprayed by the nozzles can be evenly diffused into the cooling and dehydration device, increasing the contact area between the gas and liquid phases, and further improving the heat exchange efficiency.

[0019] In an optional technical solution, the cooling and water removal device further includes: a temperature sensor arranged at the low-temperature water inlet; and an electric flow regulating valve arranged at the low-temperature water inlet corresponding to the temperature sensor.

[0020] According to the technical solution, the low-temperature water inlet temperature is monitored by a temperature sensor, and based on the monitored low-temperature water inlet temperature, the electric flow control valve is controlled to adjust the low-temperature water inlet flow in real time to ensure that the low-temperature water temperature in the cooling and water removal device is always maintained below the compressed air dew point temperature.

[0021] In an optional technical solution, the cooling and water removal device also includes: an air distribution pipeline arranged in the shell and connected to the compressed air inlet; and a plurality of wind hoods arranged at equal intervals in the air distribution pipeline and immersed in the low-temperature water provided by the low-temperature water inlet.

[0022] According to this technical solution, compressed air enters the shell of the cooling and water removal device through multiple wind hoods immersed in low-temperature water provided by the low-temperature water inlet, and the high-temperature compressed air directly contacts the low-temperature water in the form of bubbling in the low-temperature water for heat exchange.

[0023] In an optional technical solution, the cooling and water removal device further includes: a water collector arranged in the shell and located between the compressed air outlet and the low-temperature water inlet.

[0024] According to the technical solution, a water collector is arranged in the housing and located between the compressed air outlet and the low-temperature water inlet to intercept the droplets carried by the compressed air flowing through the water collector, so that this part of the water is separated from the compressed air and drips into the water collector. At the same time, by arranging the water collector between the compressed air outlet and the low-temperature water inlet, it is prevented that some of the low-temperature water droplets entering from the low-temperature water inlet are carried away from the cooling and water removal device by the compressed air.

[0025] In an optional technical solution, the cooling and water removal device also includes: a compressed air inlet arranged at the bottom of the shell and connected to the air distribution pipeline; a compressed air outlet arranged at the top of the shell; a low-temperature water inlet corresponding to a space formed between the water collector and the air distribution pipeline, which is higher than the liquid level formed by the low-temperature water provided by the low-temperature water inlet in the shell; and a low-temperature water outlet corresponding to a space formed between the air distribution pipeline and the water collector, which is immersed in the low-temperature water provided by the low-temperature water inlet.

[0026] According to the technical solution, low-temperature water enters the shell of the cooling and dewatering device from the low-temperature water inlet, and is discharged from the cooling and dewatering device from the low-temperature water outlet, and the low-temperature water is controlled to maintain a certain liquid level and temperature in the shell of the cooling and dewatering device. Compressed air enters the air distribution pipeline from the compressed air inlet, and is transported to the low-temperature water through the wind cap immersed in the low-temperature water on the air distribution pipeline to exchange heat with the low-temperature water. The compressed air after heat exchange is discharged from the cooling and dewatering device from the compressed air outlet. In the above manner, the contact area between the compressed air and the low-temperature water is increased, and the heat exchange efficiency of the cooling and dewatering device is improved.

[0027] In an optional technical solution, the cooling and water removal device also includes: a temperature sensor arranged at the low-temperature water outlet; a first electric flow regulating valve arranged at the low-temperature water inlet corresponding to the temperature sensor; and a second electric flow regulating valve arranged at the low-temperature water inlet.

[0028] According to the technical solution, the temperature of the low-temperature water flowing out of the low-temperature water outlet is monitored by a temperature sensor, and the first electric flow regulating valve and the second flow regulating valve are controlled in linkage based on the monitored low-temperature water temperature to adjust the low-temperature water flow in real time, thereby ensuring that the low-temperature water in the cooling and water removal device maintains a certain liquid level height, and at the same time controlling the low-temperature water temperature to always be maintained below the dew point temperature of the compressed air.

[0029] Another aspect of the present invention also provides a compressed air energy storage system, comprising at least a first-stage compressor, a cooling and dehydration device, and a second-stage compressor connected in sequence according to the flow direction of compressed air, wherein the cooling and dehydration device is a cooling and dehydration device provided by any of the above-mentioned technical solutions, and the compressed air inlet pipeline of the cooling and dehydration device is connected to the outlet of the first-stage compressor.

[0030] According to the technical solution, a cooling and water removal device is used to replace the gas-liquid separator and cooler of the compressed air energy storage system in the prior art, so that the high-temperature compressed air can achieve the effects of cooling and gas-liquid separation in the cooling and water removal device at the same time, avoiding the situation where the outlet temperature of the heat exchanger and the outlet temperature of the cooler in the heat exchange system are lower than the dew point temperature of the air under the corresponding pressure, causing the water vapor in the compressed air to precipitate and condense on the inner wall of the heat exchanger and the cooler, causing equipment corrosion damage and seriously affecting the service life of the equipment. The unstable operation of the compressed air energy storage system caused by equipment corrosion damage is reduced, and the economic losses caused by equipment maintenance and replacement are also reduced.

[0031] In an optional technical solution, the compressed air energy storage system also includes: an air storage reservoir connected to the compressed air outlet pipeline of the cooling and water removal device.

[0032] According to this technical solution, the compressed air after cooling and dehydration is stored in the gas storage reservoir, and the energy in the compressed air is stored efficiently and for a long time, reducing the impact of renewable energy grid connection.

[0033] In an optional technical solution, the compressed air energy storage system also includes: a heat exchanger arranged between the first-stage compressor and the cooling and water removal device.

[0034] According to the technical solution, the high-temperature compressed air entering the heat exchanger from the compressor outlet exchanges heat with the energy storage medium in the heat exchanger, and most of the heat of the high-temperature compressed air is stored in the heat storage system.

[0035] In an optional technical solution, the compressed air energy storage system further includes: an inlet filter arranged at the inlet of the first-stage compressor.

[0036] According to the technical solution, the air is filtered before entering the compressed air energy storage system, thereby reducing the impact of impurities entering the compressed air energy storage system, such as reducing the operating efficiency of the compressed air energy storage system.

[0037] In an optional technical solution, the compressed air energy storage system further includes: a muffler arranged at the inlet of the first-stage compressor.

[0038] According to the technical solution, a muffler is arranged at the inlet of the compressed air energy storage system to reduce the noise generated during the operation of the compressed air energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of a compressed air energy storage system in the prior art.

[0040] Figure 2 This is a schematic structural diagram of the cooling and water removal device in the first embodiment of the present application.

[0041] Figure 3 This is a schematic structural diagram of a cooling and water removal device in the second embodiment of the present application.

[0042] Figure 4 This is a schematic diagram of a compressed air energy storage system in the third embodiment of the present application, in which the cooling and water removal device in the first embodiment of the present application is used to replace the gas-liquid separator and the cooler.

[0043] Figure 5 This is a schematic diagram of a compressed air energy storage system in the third embodiment of the present application, in which the cooling and water removal device in the second embodiment of the present application is used to replace the gas-liquid separator and the cooler.

[0044] Figure numerals: cooling and water removal device 11; cooling and water removal device 12; shell 101; compressed air inlet 102; compressed air outlet 103; low-temperature water inlet 104; low-temperature water outlet 105; sprinkler 106; water collector 107; filler 108; water collector 109; nozzle 110; temperature sensor 111; first electric flow control valve 112; air distribution pipeline 113; wind hood 114; second electric flow control valve 115; compressed air energy storage system 2; compressed air pipeline 201; first-stage compressor 202(a); heat exchanger 203(a); cooling and water removal device 1(a); second-stage compressor 202(b); heat exchanger 203(b); cooling and water removal device 1(b); air storage reservoir 204; inlet filter 205; silencer 206. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] <First Embodiment>

[0047] Figure 2 Schematic diagram of the structure of the cooling and water removal device in the first embodiment of the present application. Figure 2 As shown, the cooling and water removal device 11 of the first embodiment of the present invention includes: a shell 101; a compressed air inlet 102; a compressed air outlet 103; a low-temperature water inlet 104; a low-temperature water outlet 105; a sprinkler 106; a water collector 107; a filler 108; a water collector 109; a nozzle 110; a temperature sensor 111; and a first electric flow control valve 112.

[0048] like Figure 2As shown, the shell 101 of the cooling and water removal device 11 is provided with a compressed air inlet 102 and a low-temperature water outlet 105 near the bottom, and a compressed air outlet 103 and a low-temperature water inlet 104 near the top. Compressed air from the outside enters the shell 101 through the compressed air inlet 102 and is discharged from the shell 101 through the compressed air outlet 103. The compressed air inlet 102 and the compressed air outlet 103 are connected through the inside of the shell 101. Low-temperature water from the outside enters the shell 101 through the low-temperature water inlet 104 and is discharged from the shell 101 through the low-temperature water outlet 105. The low-temperature water inlet 104 and the low-temperature water outlet 105 are connected through the inside of the shell 101.

[0049] A sprayer 106 connected to the low-temperature water inlet 104 is arranged between the low-temperature water inlet 104 and the low-temperature water outlet 105 in the shell 101. After the low-temperature water enters the low-temperature water inlet 104, it is sprayed into the shell 101 in the form of mist through the sprayer 106. A water collector 107 is arranged between the low-temperature water inlet 104 and the sprayer 106 to intercept the droplets entrained in the compressed air flowing toward the top of the shell 101. A packing 108 matching the cross-sectional shape of the shell 101 is arranged between the sprayer 106 and the low-temperature water outlet 105. A water collector 109 is also arranged between the packing 108 and the low-temperature water outlet to collect the low-temperature water sprayed from the sprayer 106 and the condensed water condensed from the compressed air. Furthermore, a plurality of nozzles 110 are arranged at equal intervals on the sprayer 106 in a manner facing one side of the packing.

[0050] Preferably, the compressed air inlet 102 is arranged in a manner close to the water collector 109, corresponding to the space formed in the shell 101 between the filler 108 and the low-temperature water outlet 105, and the compressed air outlet 103 is arranged in a manner corresponding to the space formed in the shell 101 between the low-temperature water inlet 104 and the sprinkler 106. After the compressed air enters the shell 101 from the compressed air inlet 102 arranged at the bottom of the shell 101, it flows toward the top of the shell 101 and flows out of the shell 101 from the compressed air outlet 103 arranged at the top of the shell 101.

[0051] In the cooling and water removal device 11 in the above embodiment of the present invention, after the low-temperature water enters the shell 101 through the low-temperature water inlet 104, it is sprayed to the bottom of the shell 101 through the sprinkler 106. When the low-temperature water passes through the filler 108 that matches the cross-sectional shape of the shell 101 of the cooling and water removal device 11, the filler 108 can further break up the droplets to form a water film, increase the contact area between the low-temperature water flowing to the bottom of the shell 101 in the filler 108 and the compressed air flowing to the top of the shell 101, so that the compressed air inside the shell 101 is fully in contact with the low-temperature water, strengthen the heat and mass transfer process between the low-temperature water and the compressed air, and make the temperature of the compressed air quickly drop below the dew point temperature. At this time, the water vapor in the compressed air condenses and precipitates, and the relative humidity and moisture content of the compressed air decrease. The cooling and water removal device 11 is also provided with a water collector 107 matching the cross-sectional shape of the shell 101, which can intercept the liquid droplets entrained in the compressed air flowing toward the top of the shell 101 and the liquid droplets precipitated by cooling, and separate the liquid water entrained in the compressed air after heat exchange with the low-temperature water, so that this part of water returns to the water collector 109. After the high-temperature compressed air enters the cooling and water removal device 11 from the compressed air inlet 102 at the bottom of the shell 101, it completes heat exchange and cooling in the countercurrent with the water mist in the filler 108, separates the entrained liquid water in the water collector 107, and then flows out of the cooling and water removal device 11 from the compressed air outlet 103 near the top of the shell 101.

[0052] Through the above-mentioned implementation, after the high-temperature compressed air enters the cooling and water removal device 11, it is fully contacted with the low-temperature water in the form of countercurrent, and the temperature is rapidly reduced to below the dew point temperature, and the water vapor in the compressed air condenses and precipitates, so that the relative humidity and moisture content of the compressed air are reduced. This effectively avoids the problem in the prior art that when the compressed air is cooled and water is removed by connecting the heat exchanger and the gas-liquid separator, the outlet temperature of the heat exchanger is lower than the dew point temperature of the compressed air under the corresponding pressure, so that the water vapor in the compressed air is precipitated in the heat exchanger and condensed on the inner wall of the heat exchanger, causing corrosion damage to the equipment and seriously affecting the service life of the equipment.

[0053] Preferably, a temperature sensor 111 and a first electric flow regulating valve 112 are provided at the low-temperature water inlet 104. The low-temperature water inlet 104 is connected to a low-temperature water supply pipeline (not shown) in the plant area; the low-temperature water outlet 105 is connected to a cooling water pipeline (not shown) in the plant area, and the low-temperature water is transported to a cooling device (not shown), and the temperature of the low-temperature water entering the cooling and water removal device 11 is controlled to be kept below the minimum dew point temperature of the compressed air.

[0054] Through the above implementation, the temperature sensor 111 monitors the temperature of the low-temperature water flowing through the low-temperature water inlet 104 and controls the first electric flow control valve 112 to adjust the low-temperature water supply flow in real time based on the monitored low-temperature water temperature at the low-temperature water inlet 104, and ensures that the low-temperature water temperature at various locations in the shell 101 is always maintained below the dew point temperature of the compressed air by adjusting the flow rate.

[0055] In this embodiment, the compressed air inlet 102, the compressed air outlet 103, the low-temperature water inlet 104, and the low-temperature water outlet 105 are arranged in a countercurrent manner between the compressed air and the low-temperature water, but the present invention is not limited thereto. According to different pipeline connections, other forms can be used to make the compressed air and the low-temperature water contact each other. For example, in a downstream manner, as long as the compressed air and the low-temperature water can be directly contacted and heat exchanged inside the cooling and water removal device 11, they should be included in the protection scope of the present application.

[0056] In addition, although in the present embodiment, the nozzles 110 are arranged at equal intervals on the sprinkler 106 in a manner facing one side of the filler, the present application is not limited to this. The setting of the form and position of the nozzles 110 can be optimized according to the flow field characteristics in the cooling and water removal device 11, which should be included in the protection scope of the present application.

[0057] <Second Embodiment>

[0058] The cooling and water removal device 12 of the second embodiment of the present application is described using the same name or symbol as the cooling and water removal device 11 of the first embodiment of the present application, and they are the same in content, which will not be repeated here.

[0059] Figure 3 Schematic diagram of the structure of the cooling and water removal device 12 in the second embodiment of the present application. Figure 3 As shown, different from the first embodiment, the cooling and water removal device 12 provided in the second embodiment further includes: an air distribution pipeline 113; a wind cap 114; and a second electric flow control valve 115.

[0060] Among them, Figure 3 As shown, the shell 101 of the cooling and water removal device 12 is provided with a compressed air inlet 102 and a low-temperature water outlet 105 near the bottom, and a compressed air outlet 103 and a low-temperature water inlet 104 near the top. Compressed air from the outside enters the shell 101 through the compressed air inlet 102 and is discharged from the shell 101 through the compressed air outlet 103. The compressed air inlet 102 and the compressed air outlet 103 are connected through the inside of the shell 101. Low-temperature water from the outside enters the shell 101 through the low-temperature water inlet 104 and is discharged from the shell 101 through the low-temperature water outlet 105. The low-temperature water inlet 104 and the low-temperature water outlet 105 are connected through the inside of the shell 101.

[0061] A water collector 109 connected to the low-temperature water outlet 105 is provided between the low-temperature water inlet 104 and the low-temperature water outlet 105 in the housing 101. The low-temperature water is stored in the water collector 109 in a form of maintaining a certain liquid level and temperature. An air distribution pipeline 113 connected to the compressed air inlet 103 is provided near the bottom of the cooling and water removal device 12. A plurality of wind caps 114 are evenly spaced on the pipe section of the air distribution pipeline 113 immersed in the low-temperature water in the water collector 109. After the compressed air enters the compressed air inlet 102, it enters the water collector 109 in the form of bubbles through the wind caps 114 on the air distribution pipeline 113, and exchanges heat with the low-temperature water stored in the water collector 109. A water collector 107 is provided between the low-temperature water inlet 104 and the low-temperature water outlet 105 to intercept the droplets entrained in the compressed air flowing toward the top of the housing 101.

[0062] Preferably, the low-temperature water inlet 104 is arranged in a space formed in the shell 101 between the water collector 107 and the gas distribution pipeline 113, which is higher than the liquid surface formed by the low-temperature water provided by the low-temperature water inlet 104. The low-temperature water outlet is arranged in a space formed in the shell 101 between the gas distribution pipeline 113 and the water collector 107, which is immersed in the low-temperature water provided by the low-temperature water inlet 104, and is connected to the low-temperature water in the water collector 109.

[0063] In the cooling and dehumidifying device 12 in the above embodiment of the present invention, after the compressed air enters the shell 101 through the compressed air inlet 102, it flows into the low-temperature water stored in the water collector 109 through the wind cap 114 arranged on the air distribution pipeline 113. The high-temperature compressed air passes through the water collector 109 in the form of bubbles, and exchanges heat with the low-temperature water in the water collector 109, so that the temperature of the compressed air is rapidly reduced to below the dew point temperature. At this time, the water vapor in the compressed air condenses and precipitates, and the relative humidity and moisture content of the compressed air decrease. The cooling and dehumidifying device 12 is also provided with a water collector 107 that matches the cross-sectional shape of the shell 101, which can intercept the droplets entrained in the compressed air flowing toward the top of the shell 101 and the droplets precipitated by cooling, and separate the liquid water entrained in the compressed air after heat exchange with the low-temperature water, so that this part of water returns to the water collector 109.

[0064] Through the above method, after the high-temperature compressed air enters the cooling and dehydrating device 12, it is fully contacted with the low-temperature water in the form of bubbling in the low-temperature water, and the temperature is rapidly reduced to below the dew point temperature, and the water vapor in the compressed air condenses and precipitates, so that the relative humidity and moisture content of the compressed air are reduced. This effectively avoids the problem in the prior art that when the compressed air is cooled and dehydrated by connecting the heat exchanger and the gas-liquid separator, the outlet temperature of the heat exchanger is lower than the dew point temperature of the compressed air under the corresponding pressure, so that the water vapor in the compressed air is precipitated in the heat exchanger and condensed on the inner wall of the heat exchanger, causing corrosion damage to the equipment and seriously affecting the service life of the equipment.

[0065] Preferably, a first electric flow regulating valve is provided at the low-temperature water inlet 104, and a temperature sensor 111 and a second electric flow regulating valve 115 are provided at the low-temperature water outlet 105. After the low-temperature water with a temperature lower than the dew point temperature of the compressed air enters the cooling and water removal device 12 from the low-temperature water inlet 104, it is collected in the water collector 109, and merges with the low-temperature water heated after heat exchange with the high-temperature compressed air in the water collector 109, so as to control the temperature of the low-temperature water in the water collector 109 to be always lower than the dew point temperature of the compressed air. At the same time, the low-temperature water collected in the water collector 109 flows out of the water collector from the low-temperature water outlet 105 connected to the water collector 109, so as to ensure that the low-temperature water in the water collector 109 always maintains a certain liquid level.

[0066] Through the above implementation, the temperature sensor 111 detects the temperature of the low-temperature water flowing out from the low-temperature water outlet 105, and controls the first electric flow regulating valve 112 and the second electric flow regulating valve 113 in real time to adjust the low-temperature water supply flow rate based on the monitored low-temperature water temperature at the low-temperature water outlet 105. By simultaneously adjusting the flow rate, the low-temperature water in the water collector 109 is ensured to maintain a certain liquid level while the low-temperature water temperature is always maintained below the dew point temperature of the compressed air.

[0067] Although the hoods 114 are arranged at equal intervals on the air distribution pipeline 113 in the present embodiment, the present application is not limited to this. Changing and optimizing the form and position of the hoods 114 according to the flow field characteristics in the cooling and water removal device 12 should be included in the protection scope of the present application.

[0068] <Third Embodiment>

[0069] The third embodiment of the present application provides a compressed air energy storage system 2, which is equipped with the cooling and water removal device 11 of the first embodiment of the present application or the cooling and water removal device 12 of the second embodiment. Among them, the same names and symbols as those in the above other embodiments are used for explanation, which are the same contents and will not be repeated here.

[0070] Figure 4 It is a schematic diagram of a compressed air energy storage system 2 provided in the third embodiment of the present application, which uses a cooling and water removal device 11 to replace a gas-liquid separator and a cooler. Figure 5 Schematic diagram of a compressed air energy storage system 2 using a cooling and water removal device 12 instead of a gas-liquid separator and a cooler provided in the third embodiment of the present application. Figure 4 , Figure 5As shown, the compressed air energy storage system 2 at least includes a compressor, a heat exchanger, a cooling and water removal device, and an air storage reservoir, which are sequentially connected through a compressed air pipeline 201. In the following description, the first-stage compressor 202 (a), the heat exchanger 203 (a), the cooling and water removal device 1 (a), the second-stage compressor 202 (b), the heat exchanger 203 (b), the cooling and water removal device 1 (b), and the air storage reservoir 204, which are sequentially connected through a compressed air pipeline 201 (i.e., two-stage compression) are used for description.

[0071] Preferably, an inlet filter 205 and a muffler 206 are also provided at the inlet of the first-stage compressor 202 (a).

[0072] It should be noted that the cooling and water removal device 1 (a) and the cooling and water removal device 1 (b) can adopt the cooling and water removal device 11 in the first embodiment of the present application or the cooling and water removal device 12 in the second embodiment of the present application or a combination of the cooling and water removal device 11 and the cooling and water removal device 12 to achieve the cooling and water removal effect without any special restrictions.

[0073] In the compressed air energy storage system 2 in the above embodiment of the present invention, after the air is filtered through the inlet filter 205, it enters the compressed air energy storage system 2 and is first compressed by the first-stage compressor 202 (a). The outlet of the first-stage compressor 202 (a) is high-temperature and high-pressure compressed air. The high-temperature and high-pressure compressed air enters the heat exchanger 203 (a) from the compressed air pipeline 201, and exchanges heat with the energy storage medium in the heat exchanger 203 (a), and most of the heat of the high-temperature compressed air is stored in the heat storage system. The air outlet of the heat exchanger 203 (a) is connected to the compressed air inlet 102 of the cooling and dehydration device 1 (a), and exchanges heat with low-temperature water in the cooling and dehydration device 1 (a), further reducing the temperature of the compressed air, condensing the water vapor in the compressed air into liquid, and reducing the moisture content of the compressed air.

[0074] The compressed air outlet 103 of the cooling and water removal device 1(a) is connected to the second compressor 202(b), and the compressed air after cooling and water removal is compressed for a second time. The compressed air pressure at the outlet of the second compressor 202(b) is further increased, and the dew point temperature of the compressed air is also increased accordingly. The compressed gas after the second compression enters the heat exchanger 203(b) from the compressed air pipeline 201, and exchanges heat with the energy storage medium in the heat exchanger 203(b), and most of the heat of the compressed air is stored in the heat storage system. The air outlet of the heat exchanger 203(b) is connected to the compressed air inlet 102 in the cooling and water removal device 1(b). The compressed air exchanges heat with low-temperature water in the cooling and water removal device 1(b), further reducing the temperature of the compressed air, condensing the water vapor in the compressed air into liquid, and reducing the moisture content of the compressed air. At this time, the pressure and temperature of the compressed air meet the pressure and temperature requirements at the entrance of the gas storage reservoir. The compressed air outlet 103 of the cooling and water removal device 1 (b) is connected to the air storage reservoir 204 to store the high-pressure compressed air in the air storage reservoir 204.

[0075] Through the above method, the gas-liquid separator and cooler in the prior art compressed air energy storage system 2 are replaced by the cooling and water removal device 1 (a) or the cooling and water removal device 1 (b), so that the high-temperature compressed air can achieve the effects of cooling and gas-liquid separation in the cooling and water removal device 1 (a) or the cooling and water removal device 1 (b), avoiding the situation where the outlet temperature of the heat exchanger 203 and the outlet temperature of the cooler in the heat exchange system are lower than the dew point temperature of the air under the corresponding pressure, resulting in the precipitation of water vapor in the compressed air and condensation on the inner wall of the heat exchanger 203 and the cooler, causing equipment corrosion damage and seriously affecting the service life of the equipment. The unstable operation of the compressed air energy storage system caused by equipment corrosion damage is reduced, and the economic losses caused by equipment maintenance and replacement are also reduced.

[0076] It should be noted that, although in this embodiment, the first stage compressor 202 (a), heat exchanger 203 (a), cooling and water removal device 1 (a), second stage compressor 202 (b), heat exchanger 203 (b), cooling and water removal device 1 (b), and air storage 204 connected in sequence through the compressed air pipeline 201 are used as an example (i.e., two-stage compression) for explanation, the present invention is not limited thereto, and multi-stage compression may also be used according to different energy storage scales.

[0077] In addition, although in this embodiment, the compressed air energy storage system 2 replaces all coolers and gas-liquid separators on the compression side in the prior art with a cooling and dehydration device 1 (a) or a cooling and dehydration device 1 (b). However, the present invention is not limited to this. Depending on the relative humidity of the air and the dehydration effect of the device, it is not necessary to replace all coolers and gas-liquid separators. If the relative humidity of the air is low and the dehydration effect of the device is good, select one or more places to use the cooling and dehydration device 1 (a) or the cooling and dehydration device 1 (b) of the present application. As long as the setting can reduce the moisture content and dew point temperature of the compressed air to a state where water vapor no longer condenses and precipitates, it should be included in the protection scope of the present application.

[0078] The above is only a preferred implementation mode of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cooling and water removal device, comprising: case; A compressed air inlet, the opening of which is arranged on the housing, for introducing compressed air from the outside; A compressed air outlet, the opening of which is disposed on the housing and communicates with the compressed air inlet through the interior of the housing; A low-temperature water inlet, with an opening disposed on the shell, for introducing low-temperature water from outside; A low-temperature water outlet, the opening of which is disposed on the shell and communicates with the low-temperature water inlet through the interior of the shell, It is characterized in that The temperature of the low-temperature water entering from the low-temperature water inlet is lower than the dew point temperature of the compressed air entering from the compressed air inlet, and the low-temperature water is in direct contact with the compressed air inside the housing.

2. The cooling and water removal device according to claim 1, characterized in that: A sprinkler is provided inside the shell between the low-temperature water inlet and the low-temperature water outlet; The low-temperature water from the low-temperature water inlet directly contacts the compressed air after being sprayed out from the sprinkler.

3. The cooling and water removal device according to claim 2, characterized in that: Also includes, A water collector, arranged in the housing and located between the low-temperature water inlet and the sprayer; The filler is arranged in the shell and located between the sprayer and the low-temperature water outlet.

4. The cooling and water removal device according to claim 3, characterized in that: It also includes a water collector, which is arranged in the shell and located between the filler and the low-temperature water outlet.

5. The cooling and water removal device according to claim 3, characterized in that: The compressed air inlet is correspondingly arranged in a space of the shell formed between the filler and the low-temperature water outlet; The compressed air outlet is correspondingly arranged in the space of the shell formed between the low-temperature water inlet and the sprinkler; The low-temperature water inlet is arranged at the top of the shell; The low-temperature water outlet is arranged at the bottom of the shell.

6. The cooling and water removal device according to claim 4, characterized in that: The sprayer also includes: A plurality of nozzles are arranged at equal intervals toward one side of the filler.

7. The cooling and water removal device according to claim 5, characterized in that: Also includes, A temperature sensor is arranged at the low-temperature water inlet; The first electric flow regulating valve is arranged at the low-temperature water inlet corresponding to the temperature sensor.

8. The cooling and water removal device according to claim 1, characterized in that: Also includes, an air distribution pipeline, disposed in the housing and connected to the compressed air inlet; A plurality of hoods are arranged at equal intervals on the air distribution pipeline and immersed in the low-temperature water provided by the low-temperature water inlet.

9. The cooling and water removal device according to claim 8, characterized in that: Also includes, The water collector is arranged in the shell and located between the compressed air outlet and the low-temperature water inlet.

10. The cooling and water removal device according to claim 9, characterized in that: The compressed air inlet is arranged at the bottom of the housing and is connected to the air distribution pipeline; The compressed air outlet is arranged at the top of the housing; The low-temperature water inlet is correspondingly arranged in a space formed between the water collector and the gas distribution pipeline in the shell and higher than the low-temperature water liquid level provided by the low-temperature water inlet; The low-temperature water outlet is correspondingly arranged in a space formed between the gas distribution pipeline and the water collector and immersed in the low-temperature water provided by the low-temperature water inlet in the shell.

11. The cooling and water removal device according to claim 10, characterized in that: Also includes, A temperature sensor is arranged at the low-temperature water outlet; A first electric flow regulating valve, arranged at the low-temperature water inlet; The second electric flow regulating valve is arranged at the low-temperature water outlet corresponding to the temperature sensor.

12. A compressed air energy storage system, comprising at least a first-stage compressor, a cooling and water removal device, and a second-stage compressor connected in sequence according to the flow direction of compressed air, It is characterized in that The cooling and water removal device is the cooling and water removal device according to any one of claims 1 to 11, and the compressed air inlet pipeline is connected to the outlet of the first-stage compressor.

13. The compressed air energy storage system according to claim 12, characterized in that: Also includes, The air storage is connected to the compressed air outlet pipeline of the cooling and water removal device.

14. The compressed air energy storage system according to claim 12, characterized in that: Also includes, The heat exchanger is arranged between the first-stage compressor and the cooling and water removal device.

15. The compressed air energy storage system according to claim 12, characterized in that: Also includes, An inlet filter is arranged at the inlet of the first-stage compressor.

16. The compressed air energy storage system according to claim 12, characterized in that: Also includes, A muffler is arranged at the inlet of the first-stage compressor.

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