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, including: a shell formed by a first side plate, a second side plate, a top plate and a bottom plate; a compressed air inlet opening provided on the first side plate and introducing compressed air from the outside; a compressed air outlet opening provided on the second side plate of the shell and opposite to the first side plate where the compressed air inlet is located and connected to the compressed air inlet through the inside of the shell; a low-temperature water inlet opening provided on the first side plate or the top plate and introducing low-temperature water from the outside; a low-temperature water outlet opening provided on the first side plate or the second side plate close to the bottom plate and connected to the low-temperature water inlet through the inside of the shell; a filler provided in the shell and located between the low-temperature water inlet and the low-temperature water outlet; a sprinkler provided in the shell, located between the low-temperature water inlet and the filler and connected to the low-temperature water inlet. 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 scheme, compressed air enters the shell of the cooling and dewatering device 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 shell of the cooling and dewatering device through the low-temperature water inlet, diffuses to the bottom of the shell through the sprayer, and is discharged through the inside of the shell connected to the low-temperature water outlet. In the cooling and dewatering device, the compressed air is fully in contact with the 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. It 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, so that the water vapor in the compressed air precipitates and condenses 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. By arranging a filler matching the cross-sectional shape of the dewatering device in the cooling and dewatering device, the low-temperature water droplets sprayed by the sprayer into the cooling and dewatering device are broken to form a water film, the contact area of ​​the gas-liquid two phases is increased, and the heat and mass transfer between the low-temperature water and the compressed air is further enhanced.

[0010] In an optional technical solution, the cooling and water removal device also includes: a water collector arranged in the shell and located between the compressed air outlet and the filler; a water collector arranged in the shell and located between the filler and the shell bottom plate and connected to the low-temperature water outlet.

[0011] According to the technical solution, a water collector and a water collector are provided in the cooling and water removal device. The water collector is provided in the shell and between the compressed air outlet and the filler to intercept the droplets contained 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. 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.

[0012] In an optional technical solution, it also includes: the water collector is arranged in the shell in a manner of forming a specified angle with the second side plate.

[0013] According to this technical solution, when the liquid droplets entrained in the compressed air are intercepted by the water collector, the water droplets are adsorbed on the water collector. By setting the water collector at a specified angle to the second side plate, the water droplets are controlled to flow into the water collector more quickly along the water collector.

[0014] In an optional technical solution, it also includes: the compressed air inlet is arranged in a form corresponding to the filler in the height direction of the shell; the compressed air outlet is arranged in a form corresponding to the filler in the height direction of the shell.

[0015] According to the technical solution, the compressed air inlet and the compressed air outlet are arranged corresponding to the filler in the height direction of the shell. The compressed air is controlled to enter the cooling and dewatering device through the compressed air inlet and then pass through the filler, so that all the compressed air entering the cooling and dewatering device can fully contact with the low-temperature water in the filler, further improving the heat exchange efficiency.

[0016] 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.

[0017] According to the technical solution, after the low-temperature water enters the cooling and dehydrating device through the low-temperature water inlet, it diffuses to the bottom of the device in the form of mist through the nozzle, and exchanges heat with the high-temperature compressed air from the compressed air inlet in a cross-flow manner, rapidly reducing the compressed air temperature to below the dew point temperature, so that the water vapor in the compressed air condenses and precipitates. By arranging the nozzles at equal intervals, the low-temperature water sprayed by the nozzles is evenly diffused into the cooling and dehydrating device, increasing the contact area between the gas and liquid phases, and further improving the heat exchange efficiency.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In an optional technical solution, the compressed air energy storage system further includes: a muffler arranged at the inlet of the first-stage compressor.

[0029] 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

[0030] Figure 1 Schematic diagram of a compressed air energy storage system in the prior art.

[0031] Figure 2 This is a schematic structural diagram of the cooling and water removal device in the first embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of a compressed air energy storage system provided by the second embodiment of the present application, which uses the cooling and water removal device in the first embodiment of the present application to replace the gas-liquid separator and the cooler.

[0033] Figure numerals: cooling and water removal device 1; shell 101; first side plate 1011; second side plate 1012; top plate 1013; bottom plate 1014; compressed air inlet 102; compressed air outlet 103; low-temperature water inlet 104; low-temperature water outlet 105; filler 106; sprinkler 107; water collector 108; water collector 109; nozzle 110; temperature sensor 111; electric flow control valve 112; 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

[0034] 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.

[0035] <First Embodiment>

[0036] 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 1 of the first embodiment of the present invention includes: a shell 101; a first side plate 1011; a second side plate 1012; a top plate 1013; a bottom plate 1014; a compressed air inlet 102; a compressed air outlet 103; a low-temperature water inlet 104; a low-temperature water outlet 105; a filler 106; a sprinkler 107; a water collector 108; a water collector 109; a nozzle 110; a temperature sensor 111; and an electric flow control valve 112.

[0037] like Figure 2As shown, a compressed air inlet 102 is provided at the first side plate 1011 of the shell 101 of the cooling and water removal device 1, and a compressed air outlet 103 is provided at the second side plate 1012. A low-temperature water inlet is provided at the top plate 1013 or the first side plate 1011 near the top plate 1013, and a low-temperature water outlet is provided at the bottom plate 1014 or the second side plate 1012 near the bottom plate 1014. 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.

[0038] A packing 106 is provided between the low-temperature water inlet 104 and the low-temperature water outlet 105 in the shell 101, and a sprayer 107 connected to the low-temperature water inlet 104 is provided between the low-temperature water inlet 104 and the packing 106. 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 107. A water collector 108 is provided between the compressed air outlet 103 and the packing 106 in a manner that is at a specified angle to the second side plate 1012 to intercept the droplets entrained in the compressed air flowing toward the second side plate 1012. A water collector 109 connected to the low-temperature water outlet 105 is also provided between the packing 106 and the bottom plate 1014, which is used 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 provided on the sprayer 107 at equal intervals in a manner that faces one side of the packing.

[0039] Preferably, the compressed air inlet 102 is arranged on the first side plate 1011 in a form corresponding to the filler 106 in the height direction of the housing 101, and the compressed air outlet 103 is arranged on the second side plate 1012 in a form corresponding to the filler 106 in the height direction of the housing 101. At the same time, the openings of the compressed air inlet 102 and the compressed air outlet 103 in the height direction of the housing 101 are smaller than the height of the filler 106.

[0040] In the cooling and water removal device 1 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 107. When the low-temperature water passes through the filler 106, the filler 106 can further break up the droplets to form a water film, increase the contact area between the low-temperature water flowing to the bottom plate 1014 of the shell 101 in the filler 106 and the compressed air flowing to the second side plate 1012 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 quickly reduce the temperature of the compressed air 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 water removal device 1 is also provided with a water collector 108 arranged at a specified angle with the second side plate 1012 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. At the same time, the water collector 108 is arranged at a specified angle so that this part of water can return to the water collector 109 more quickly. After the high-temperature compressed air enters the cooling and water removal device 1 from the compressed air inlet 102 arranged on the first side plate 1011, it completes heat exchange and cooling in the filler 106 with the water mist cross flow, separates the entrained liquid water in the water collector 108, and then flows out of the cooling and water removal device 11 from the compressed air outlet 103 close to the second side plate 1012 of the shell 101.

[0041] Through the above-mentioned implementation, after the high-temperature compressed air enters the cooling and water removal device 1, it is fully contacted with the low-temperature water in the form of cross flow, 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.

[0042] The compressed air enters the cooling and dehydrating device 1 in the form of a cross flow, and the compressed air inlet 102 is arranged corresponding to the filler 106 in the height direction of the shell 101. There is no backflow obstruction in the flow direction of the compressed air, and the wind speed requirement at the compressed air inlet 102 is relatively low. Accordingly, a motor with lower power consumption can be selected to provide driving force for the compressed air. At the same time, because the compressed air flows in the cooling and dehydrating device 1 in the form of a cross flow, the cooling and dehydrating device 1 is more flexible in the height direction, and the cooling and dehydrating device 1 of different heights and lengths can be set according to the system needs. While flexibly adapting to different height requirements, the needs of compressed air cooling and dehydration can also be met by extending the length in the flow direction of the compressed air.

[0043] 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.

[0044] 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.

[0045] In this embodiment, the compressed air inlet 102 and the compressed air outlet 103 are arranged in the form of compressed air cross flow, and the low-temperature water inlet 104 and the low-temperature water outlet 105 are arranged in the form of low-temperature water spraying from the top of the shell 101 to the bottom, but it is not limited to this. According to different pipeline connections, other forms are used to make the compressed air contact with the low-temperature water. For example, downstream, countercurrent, etc., as long as the compressed air and the low-temperature water can be directly contacted inside the cooling and water removal device 11 for heat exchange, they should be included in the protection scope of this application.

[0046] Preferably, a portion of the filler 106 near the water collector 109 is immersed in the low-temperature water in the water collector 109 .

[0047] Through the above-mentioned implementation, after the low-temperature water and the compressed air complete the heat exchange, they flow toward the bottom of the shell 101 through the gaps in the filler 106 under the action of gravity. Because the bottom part of the filler 106 is immersed in the low-temperature water in the water collector 109, the water flows through the gaps in the filler and directly merges with the low-temperature water in the water collector 109, reducing or eliminating the noise when the water drops fall.

[0048] 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.

[0049] <Second Embodiment>

[0050] The second embodiment of the present application provides a compressed air energy storage system 2, which is equipped with the cooling and water removal device 1 of the first embodiment of the present application. Among them, the same names and symbols as those in the above other embodiments are used for explanation, and they all belong to the same content, which will not be repeated here.

[0051] Figure 3 Schematic diagram of a compressed air energy storage system 2 using a cooling and water removal device 1 instead of a gas-liquid separator and a cooler provided in the second embodiment of the present application. Figure 3 As 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.

[0052] Preferably, an inlet filter 205 and a muffler 206 are also provided at the inlet of the first-stage compressor 202 (a).

[0053] 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.

[0054] 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.

[0055] It should be noted that, although in the present 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.

[0056] 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.

[0057] 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.

[0058] 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: The shell is formed by enclosing a first side plate, a second side plate, a top plate and a bottom plate; A compressed air inlet, the opening of which is arranged on the first side plate, for introducing compressed air from the outside; A compressed air outlet, the opening of which is disposed on the second side plate of the housing and is disposed opposite to the first side plate where the compressed air inlet is located, and is communicated with the compressed air inlet through the interior of the housing; A low-temperature water inlet, the opening of which is arranged on the first side plate or the top plate, for introducing low-temperature water from the outside; A low-temperature water outlet, the opening of which is arranged on the first side plate or the second side plate close to the bottom plate, and is connected to the low-temperature water inlet through the interior of the shell; A filler, arranged in the shell and located between the low-temperature water inlet and the low-temperature water outlet; A sprayer is arranged in the housing, located between the low-temperature water inlet and the filler, and communicated with the low-temperature water inlet. 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: Also includes, A water collector, arranged in the housing and located between the compressed air outlet and the filler; The water collector is arranged in the shell, located between the filler and the bottom plate of the shell, and communicated with the low-temperature water outlet.

3. The cooling and water removal device according to claim 2, characterized in that: The water collector is disposed in the housing in a manner of being disposed at a predetermined angle to the second side plate.

4. The cooling and water removal device according to claim 2, characterized in that: The compressed air inlet is arranged in a form corresponding to the filler in the height direction of the shell; The compressed air outlet is arranged in a form corresponding to the filler in the height direction of the housing.

5. 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.

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

7. 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, characterized in that: The cooling and water removal device is the cooling and water removal device according to any one of claims 1 to 6, and the compressed air inlet pipeline is connected to the outlet of the first-stage compressor.

8. The compressed air energy storage system according to claim 7, characterized in that: Also includes, The air storage is connected to the compressed air outlet pipeline of the cooling and water removal device.

9. The compressed air energy storage system according to claim 7, characterized in that: Also includes, The heat exchanger is arranged between the first-stage compressor and the cooling and water removal device.

10. The compressed air energy storage system according to claim 7, characterized in that: Also includes, An inlet filter is arranged at the inlet of the first-stage compressor.

11. The compressed air energy storage system according to claim 7, characterized in that: Also includes, A muffler is arranged at the inlet of the first-stage compressor.

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