Energy-saving water removal system, compressed air energy storage system

Abstract

The application provides an energy-saving water removal system and a compressed air energy storage system using the same. The system adds a water removal device to the compression side of the existing multi-stage compressed air energy storage system and replaces the original cooler with an air heat exchanger. The waste heat utilization drying method can dehydrate and dry the compressed air, reduce the moisture content and dew point temperature of the compressed air, avoid the condensation and precipitation of water vapor, delay the corrosion rate of equipment, and repeatedly regenerate and circulate the adsorbent within a specified period by using the waste heat of the compressed air, thereby improving the energy utilization rate of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy-saving water removal and compressed air energy storage, in particular to an energy-saving water removal system and a compressed air energy storage system using the same. BACKGROUND

[0002] At present, the energy consumption structure in China is gradually changing from a fossil energy-based energy consumption structure to a new energy-based energy consumption structure. Renewable new energy represented by solar energy and wind energy is developing rapidly, but renewable power generation is greatly 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 prior art, 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, high energy storage efficiency, etc. The compressed air energy storage system mainly consists of compression system, heat exchange system, heat storage system, gas storage system, turbine expansion system and other subsystems.

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

[0005] The heat exchange system composed of the heat exchanger, the gas-liquid separator and the cooler is an important component of the compressed air energy storage system, which plays a crucial role and occupies a very large investment proportion. In the design and actual operation of the compressed air energy storage system, due to the consideration of the heat balance of the whole system or the large air humidity, etc., the outlet temperature of the heat exchanger and the outlet temperature of the cooler in the heat exchange system are often less than the dew point temperature of the air at the corresponding pressure, which will cause the water vapor in the compressed air to precipitate and condense on the inner wall of the heat exchanger and the cooler, resulting in equipment corrosion and damage, which seriously affects the service life of the equipment. This will seriously affect the stable operation of the whole compressed air energy storage system and cause huge economic losses in equipment maintenance and replacement.

[0006] Therefore, in the design and application of compressed air system, the condensation of water vapor in compressed air must be paid high attention. The water in compressed air mainly comes from the water in the air sucked by the air compressor from the air inlet during operation. The amount of water entering the compressed air system per unit time is related to the displacement of the air compressor, the ambient temperature and the relative humidity of the wet air. The amount of condensed water 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 pressure of the compressed air is continuously rising, and under the condition that the moisture content of the compressed air is unchanged, the dew point temperature of the compressed air is continuously rising. In the heat exchange process, the temperature of the compressed air is reduced, and when the temperature is lower than the dew point temperature, the water content in the saturated wet air is reduced, which leads to the condensation of water vapor.

[0007] In addition, the temperature of the compressed air inlet of the air cooler in the heat exchange system is high, and the heat is directly dissipated to the atmosphere in the form of waste heat after heat exchange in the cooler, which causes great energy waste. SUMMARY

[0008] In view of the above problems, the present application provides an energy-saving water removal system suitable for compressed air energy storage and a compressed air energy storage system using the energy-saving water removal system. The energy-saving water removal system can use a dehydrating agent to dehydrate and dry the compressed air, reduce the relative humidity and moisture content of the compressed air, and the dew point temperature of the compressed air in the subsequent compression and heat exchange process, avoid the condensation of water vapor, and can use the waste heat of the compressed air to regenerate the dehydrating agent repeatedly within a specified period to realize cyclic operation.

[0009] The first aspect of the present application provides an energy-saving water removal system, comprising: a first shell with a first regenerated dehydrating agent; a second shell with a second regenerated dehydrating agent; a first shell inlet valve with one end communicating with the first shell and the other end communicating with the compressed air inlet pipeline; a second shell inlet valve with one end communicating with the second shell and the other end communicating with the compressed air inlet pipeline; a first shell outlet side check valve with one end communicating with the first shell and the other end communicating with the compressed air outlet pipeline; a second shell outlet side check valve with one end communicating with the second shell and the other end communicating with the compressed air outlet pipeline; a first shell outlet side regeneration check valve with one end communicating with the first shell and the other end communicating with the external air pipeline; a second shell outlet side regeneration check valve with one end communicating with the second shell and the other end communicating with the external air pipeline; a first shell inlet side regeneration valve with one end communicating with the first shell and the other end communicating with the second shell; a second shell inlet side regeneration valve with one end communicating with the second shell and the other end communicating with the first shell inlet side regeneration valve; a compressed air-external air heat exchanger with one side communicating with the compressed air outlet pipeline and the other side communicating with the external air pipeline, wherein the outlet of the secondary side of the compressed air-external air heat exchanger communicates with the first shell outlet side regeneration check valve and the second shell outlet side regeneration check valve.

[0010] According to the technical scheme, the high-temperature and high-pressure compressed air can be controlled to enter the first shell (or the second shell) to carry out dehydration, and the high-temperature external air enters the second shell (or the first shell) to make the built-in regenerative dehydrating agent desorb. Taking the first shell into which the high-temperature compressed air is introduced to carry out dehydration and the second shell into which the high-temperature external air is introduced to desorb the regenerative dehydrating agent as an example, the high-temperature and high-pressure compressed air flows into the energy-saving water removal system through the first shell inlet valve, and the compressed air and the first regenerative dehydrating agent are fully contacted in the first shell, the water vapor in the compressed air is adsorbed by the first regenerative dehydrating agent, and the relative humidity, the moisture content and the dew point temperature are reduced. The compressed air after dehydration flows into the primary side of the compressed air-external air heat exchanger through the first shell outlet side check valve, and exchanges heat with the air from the outside in the secondary side, at this time, since the compressed air has completed dehydration in the first shell, no water vapor is condensed in the compressed air-external air heat exchanger.

[0011] At the same time, the temperature of the external air in the secondary side of the compressed air-external air heat exchanger is increased after heat exchange with the compressed air, and the external air enters the second shell through the second shell outlet side regeneration check valve, so that the moisture in the second regenerative dehydrating agent is desorbed at a high temperature to complete the regeneration process of the second regenerative dehydrating agent, and the high-temperature external air is discharged from the second shell inlet side regeneration valve to the energy-saving water removal system.

[0012] Then, the first shell and the second shell can be switched, that is, the high-temperature compressed air is introduced into the second shell to carry out dehydration, and the high-temperature external air is introduced into the first shell to desorb the regenerative dehydrating agent, and the first shell and the second shell are repeatedly switched, so that the dehydration of the compressed air is not interrupted.

[0013] According to the technical scheme of the present application, the problem that the outlet temperature of the heat exchanger is less than the dew point temperature of the compressed air under the corresponding pressure in the prior art, so that the water vapor in the compressed air is precipitated and condensed on the inner wall of the heat exchanger and the cooler, causing corrosion and damage of the equipment and seriously affecting the service life of the equipment, can be effectively avoided. At the same time, the compressed air after dehydration exchanges heat with the external air in the compressed air-external air heat exchanger, realizing the reuse of waste heat of the compressed air, improving the energy utilization rate and achieving the purpose of energy saving.

[0014] In the optional technical scheme, an electric heater is further arranged on the external air pipeline between the compressed air-external air heat exchanger and the first shell outlet side regeneration check valve or the second shell outlet side regeneration check valve.

[0015] According to the technical scheme, the external air after heat exchange with the high-temperature compressed air in the compressed air-external air heat exchanger is secondarily heated by the electric heater, thereby avoiding the problem that the external air after heat exchange with the high-temperature compressed air in the compressed air-external air heat exchanger still cannot reach the regeneration temperature of the dewatering agent, thereby affecting the regeneration of the dewatering agent.

[0016] In the optional technical scheme, the muffler is further arranged in communication with one end of the first shell inlet side regeneration valve and / or the second shell inlet side regeneration valve and in communication with the atmosphere.

[0017] According to the technical scheme, the high-temperature external air is reacted with the second regenerated dewatering agent in the second shell, and after the second regenerated dewatering agent is regenerated, the second regenerated dewatering agent flows to the muffler through the second shell inlet side regeneration valve, and then is discharged into the atmosphere through the muffler, thereby reducing the noise generated during the operation of the energy-saving dewatering system.

[0018] In the optional technical scheme, the fan is further arranged on the external air pipeline.

[0019] According to the technical scheme, the external air is introduced into the energy-saving dewatering system by the fan, and the fan provides driving force for the flow of the external air in the external air pipeline, so that the external air is heat-exchanged with the compressed air in the compressed air-external air heat exchanger, and the waste heat of the compressed air is used to desorb the first regenerated dewatering agent after water absorption in the first shell or the second regenerated dewatering agent after water absorption in the second shell, thereby completing the regeneration of the first regenerated dewatering agent or the second regenerated dewatering agent.

[0020] In the optional technical scheme, the first regenerated dewatering agent and / or the second regenerated dewatering agent is at least one selected from zeolite, activated alumina, molecular sieve, silica gel and ethylene glycol.

[0021] According to the technical scheme, when one of zeolite, activated alumina, molecular sieve, silica gel and ethylene glycol is selected as the first regenerated dewatering agent and / or the second regenerated dewatering agent, the first regenerated dewatering agent and / or the second regenerated dewatering agent has reversibility. When the temperature in the first shell or the second shell reaches the regeneration temperature, the moisture in the first regenerated dewatering agent or the second regenerated dewatering agent is desorbed at high temperature, thereby realizing the regeneration of the first regenerated dewatering agent or the second regenerated dewatering agent.

[0022] In another aspect of the present application, a compressed air energy storage system is further provided, which at least comprises a first-stage compressor, an energy-saving dewatering system and a second-stage compressor arranged in sequence in the flow direction of the compressed air, wherein the energy-saving dewatering system is the energy-saving dewatering system provided in any one of the above technical schemes, and the compressed air inlet pipeline is in communication with the outlet of the first-stage compressor.

[0023] According to the technical scheme, the energy-saving water removal system is used to replace the gas-liquid separator and the 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 energy-saving water removal system, and the situation that the outlet temperature of the heat exchanger and the outlet temperature of the cooler in the heat exchange system are less than the dew point temperature of the air under the corresponding pressure, the water vapor in the compressed air is precipitated and condensed on the inner wall of the heat exchanger and the cooler, the equipment is corroded and damaged, and the service life of the equipment is seriously affected is avoided. The unstable operation of the compressed air energy storage system caused by the corrosion and damage of the equipment is reduced, and the economic loss caused by equipment maintenance and replacement is also reduced. By controlling the heat exchange between the compressed air and the external air in the energy-saving water removal system, the purpose of cooling the compressed air is achieved, and the waste heat of the compressed air is also reused, the energy utilization rate is improved, and the purpose of energy saving is achieved.

[0024] In an optional technical scheme, the compressed air energy storage system further comprises: a gas storage arranged in communication with the compressed air outlet pipeline of the energy-saving water removal system.

[0025] According to the technical scheme, the compressed air after cooling and water removal is stored in the gas storage, and the energy in the compressed air is stored efficiently and for a long time, and the influence caused by the grid connection of renewable energy is reduced.

[0026] In an optional technical scheme, the compressed air energy storage system further comprises: an energy storage heat exchanger arranged between the first-stage compressor and the energy-saving water removal system.

[0027] According to the technical scheme, the high-temperature compressed air from the outlet of the compressor exchanges heat with the energy storage medium in the energy storage heat exchanger, and most of the heat of the high-temperature compressed air is stored in the heat storage system.

[0028] In an optional technical scheme, the compressed air energy storage system further comprises: an inlet filter arranged at the inlet of the first-stage compressor.

[0029] According to the technical scheme, the air is filtered before entering the compressed air energy storage system, and the influence of impurities and the like entering the compressed air energy storage system on the operation efficiency of the compressed air energy storage system is reduced.

[0030] In an optional technical scheme, the compressed air energy storage system further comprises: a second silencer arranged at the inlet of the first-stage compressor.

[0031] According to the technical scheme, the second silencer is arranged at the inlet of the compressed air energy storage system, and the noise generated when the compressed air energy storage system operates is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic view of the compressed air energy storage system in the prior art.

[0033] Figure 2 This is a schematic diagram of the energy-saving water removal system in the first embodiment of this application.

[0034] Figure 3 This is a schematic diagram of a compressed air energy storage system provided in the second embodiment of this application, which uses the energy-saving dewatering system in the first embodiment of this application to replace the gas-liquid separator and cooler.

[0035] Reference numerals: Energy-saving dewatering system 1; First housing 101; Second housing 102; First housing inlet valve 103; Second housing inlet valve 104; First housing outlet check valve 105; Second housing outlet check valve 106; First housing outlet regeneration check valve 107; Second housing outlet regeneration check valve 108; First housing inlet regeneration valve 109; Second housing inlet regeneration valve 110; Compressed air inlet pipeline 111; Compressed air outlet pipeline 11 2; External air pipeline 113; Compressed air-external air heat exchanger 114; Electric heater 115; Silencer 116; Fan 117; Compressed air energy storage system 2; Compressed air pipeline 201; First stage compressor 202(a); Heat exchanger 203(a); Energy-saving dewatering system 1(a); Second stage compressor 202(b); Heat exchanger 203(b); Energy-saving dewatering system 1(b); Air storage tank 204; Inlet filter 205; Second silencer 206. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] <First Implementation Method>

[0038] Figure 2 This is a schematic diagram of the energy-saving water removal system in the first embodiment of this application. Figure 2 As shown, the energy-saving dewatering system 1 of the first embodiment of the present invention includes: a first housing 101; a second housing 102; a first housing inlet valve 103; a second housing inlet valve 104; a first housing outlet side check valve 105; a second housing outlet side check valve 106; a first housing outlet side regeneration check valve 107; a second housing outlet side regeneration check valve 108; a first housing inlet side regeneration valve 109; a second housing inlet side regeneration valve 110; a compressed air inlet pipeline 111; a compressed air outlet pipeline 112; an external air pipeline 113; and a compressed air-external air heat exchanger 114.

[0039] likeFigure 2 As shown, the energy-saving dehydration system 1 consists of a first housing 101 containing a first regeneration dehydrating agent and a second housing 102 containing a second regeneration dehydrating agent, connected in parallel between a compressed air inlet pipe 111 and a compressed air outlet pipe 112. The first housing 101 has an inlet valve 103 connected at one end to the first housing 101 and at the other end to the compressed air inlet pipe 111, and an outlet check valve 105 connected at one end to the first housing 101 and at the other end to the compressed air outlet pipe 112. The second housing 102 has an inlet valve 104 connected at one end to the second housing 102 and at the other end to the compressed air inlet pipe 111, and an outlet check valve 106 connected at one end to the second housing 102 and at the other end to the compressed air outlet pipe 112.

[0040] Furthermore, a first housing inlet-side regeneration valve 109 is provided on the inlet side of the first housing 101, with one end connected to the first housing 101 and the other end connected to the second housing 102. A first housing outlet-side regeneration check valve 107 is provided on the outlet side of the first housing 101, with one end connected to the first housing 101 and the other end connected to the external air pipeline 113. A second housing outlet-side regeneration check valve 108 is provided on the inlet side of the second housing 102, with one end connected to the second housing 102 and the other end connected to the external air pipeline 113.

[0041] In the energy-saving dewatering system 1, a compressed air-external air heat exchanger 114 is installed at the compressed air outlet pipe 112 and the external air pipe 113. Its primary side is located in the compressed air outlet pipe 112, and its secondary side is located in the external air pipe 113. The outlet of the secondary side of the compressed air-external air heat exchanger 114 is connected to the first shell outlet side regeneration check valve 107 and the second shell outlet side regeneration check valve 108. The primary side of the compressed air-external air heat exchanger 114 is the high-temperature side, introducing high-temperature compressed air from the compressed air outlet pipe 112. The secondary side is the low-temperature side, introducing low-temperature external air from outside the energy-saving dewatering system 1 through the external air pipe 113. The high-temperature compressed air and the low-temperature external air are controlled to exchange heat inside the compressed air-external air heat exchanger 114, cooling the high-temperature compressed air while heating the low-temperature external air.

[0042] Preferably, such as Figure 2 As shown, the energy-saving water removal system 1 of the first embodiment of the present invention further includes: an electric heater 115; a silencer 116; and a fan 117.

[0043] The compressed air-external air heat exchanger 114 is provided with an electric heater 115 on the external air pipeline 113 between the first shell outlet side regenerative check valve 107 or the second shell outlet side regenerative check valve 108, to further heat the external air after heat exchange with the high-temperature compressed air.

[0044] The pipeline between the first shell inlet side regenerative valve 109 and the second shell inlet side regenerative valve 110 is provided with a sound absorber 116 in communication with the atmosphere, through which the external air flowing through the first shell inlet side regenerative valve 109 or the second shell inlet side regenerative valve 110 is discharged into the atmosphere.

[0045] The external air pipeline 113 is also provided with a fan 117 at the inlet, which introduces the external low-temperature air into the external air pipeline 113 and provides driving force for the low-temperature external air.

[0046] Preferably, the first regenerative dehydrating agent and / or the second regenerative dehydrating agent is at least one selected from zeolite, activated alumina, molecular sieve, silica gel, and ethylene glycol.

[0047] The energy-saving water removal system 1 in the above embodiment of the present application can control the first regenerative dehydrating agent in the first shell 101 to remove water from compressed air, while the second regenerative dehydrating agent in the second shell 102 is regenerated by desorption with high-temperature air (first mode) through valve switching. Alternatively, the first regenerative dehydrating agent in the first shell 101 is regenerated by desorption with high-temperature air, while the second regenerative dehydrating agent in the second shell 102 is used to remove water from compressed air (second mode). In the following description, the first mode will be taken as an example, in which the first regenerative dehydrating agent in the first shell 101 is used to remove water from compressed air, and the second regenerative dehydrating agent in the second shell 102 is regenerated by desorption with high-temperature air through valve switching.

[0048] According to the embodiment, the high-temperature compressed air enters the energy-saving water removal system 1 through the compressed air inlet pipeline 111, at this time the energy-saving water removal system 1 is in the first mode, the first shell air inlet valve 103 and the first shell outlet side check valve 105 are opened, the second shell air inlet valve 104 and the second shell outlet side check valve 106 are closed, the compressed air enters the first shell 101 through the first shell air inlet valve 103, the water vapor in the compressed air reacts physically with the first regenerative dehydrating agent in the first shell 101, so that the water vapor in the compressed air is adsorbed into the first regenerative dehydrating agent, and the water removal of the compressed air is realized. After the water removal is completed, the compressed air flows into the compressed air outlet pipeline 112 after flowing through the first shell outlet side check valve 105, and is transported to the compressed air-external air heat exchanger 114 on the primary side, and exchanges heat with the low-temperature external air in the compressed air-external air heat exchanger 114, and the cooled compressed air continues to flow out along the compressed air outlet pipeline 112.

[0049] The external air enters the energy-saving water removal system 1 from the external air pipeline 113 inlet, under the driving force provided by the fan 117, the external air flows into the compressed air-external air heat exchanger 114 on the secondary side, and exchanges heat with the high-temperature compressed air in the compressed air-external air heat exchanger 114, and the temperature rises, and the temperature of the external air after the temperature rises continues to flow to the electric heater 115 along the external air pipeline 113, and is further heated in the electric heater 115, so that the temperature of the external air is further increased to the regeneration temperature of the second regenerative dehydrating agent. At this time, the energy-saving water removal system 1 is in the first mode, the first shell outlet side regeneration check valve 107 and the first shell inlet side regeneration valve 109 are closed; the second shell outlet side regeneration check valve 108 and the second shell inlet side regeneration valve 110 are opened. The high-temperature external air flowing out of the electric heater 115 flows into the second shell 102 through the second shell outlet side regeneration check valve 108, and the second regenerative dehydrating agent in the second shell 102 is physically reacted by the high-temperature to realize the desorption regeneration of the second regenerative dehydrating agent. The external air after reacting with the second regenerative dehydrating agent flows to the muffler 116 through the second shell inlet side regeneration valve 110, and is discharged into the atmosphere through the muffler 116.

[0050] When the water absorption amount of the first regenerative dehydrating agent in the first shell 101 reaches the moisture capacity of the dehydrating agent, the energy-saving water removal system 1 is switched to the second mode by controlling the opening and closing of the corresponding valves, at this time the first regenerative dehydrating agent in the first shell 101 realizes the desorption regeneration of the dehydrating agent by the high-temperature air, and the second regenerative dehydrating agent in the second shell 102 removes water from the compressed air.

[0051] In the above embodiments, the water vapor in the compressed air is adsorbed by the first or second regenerative dewatering agent, so that the relative humidity and moisture content of the compressed air are reduced. The problem that the outlet temperature of the heat exchanger is lower than the dew point temperature of the compressed air at the corresponding pressure when the compressed air is cooled and dehydrated by connecting the heat exchanger and the gas-liquid separator, 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 and damage to the equipment and seriously affecting the service life of the equipment, is effectively avoided.

[0052] At the same time, after the high-temperature compressed air is dehydrated, it enters the compressed air-external air heat exchanger 114 to exchange heat with the external air. The waste heat of the compressed air is used to heat the external air, so that the compressed air is cooled and the external air is preliminarily heated by the compressed air. The use of waste heat of compressed air is realized, the energy utilization rate is improved to a certain extent, and the purpose of energy saving is achieved.

[0053] Although in this embodiment, the first regenerative dewatering agent and / or the second regenerative dewatering agent are at least one selected from zeolite, activated alumina, molecular sieve, silica gel and ethylene glycol, but the present application is not limited thereto. As long as other physical or chemical adsorption dewatering methods can realize the desorption and regeneration of the dewatering agent by high temperature, they should be included in the protection scope of the present application.

[0054] <Second embodiment>

[0055] The second embodiment of the present application provides a compressed air energy storage system 2 with the energy-saving dewatering system 1 of the first embodiment of the present application. Wherein, the same name and symbol are used in the above other embodiments, which are the same content, and will not be repeated here.

[0056] Figure 3 is a schematic diagram of the compressed air energy storage system 2 provided by the second embodiment of the present application using the energy-saving dewatering system 1 instead of the gas-liquid separator and the cooler. Wherein, as shown in Figure 3 The compressed air energy storage system 2 at least includes a compressor, a heat exchanger, an energy-saving dewatering system, and a gas storage connected in sequence through a compressed air pipeline 201. In the following description, the first segment compressor 202(a), the energy storage heat exchanger 203(a), the energy-saving dewatering system 1(a), the second segment compressor 202(b), the energy storage heat exchanger 203(b), the energy-saving dewatering system 1(b), and the gas storage 204 connected in sequence through the compressed air pipeline 201 are taken as an example (i.e. two-stage compression) for description.

[0057] Preferably, an inlet filter 205 is further arranged at the inlet of the first segment compressor 202(a); and a second silencer 206.

[0058] The compressed air energy storage system 2 in the above embodiment of the application, after the air is filtered by the inlet filter 205, enters the compressed air energy storage system 2 and is firstly preliminarily 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 energy storage heat exchanger 203(a) through the compressed air pipeline 201, exchanges heat with the energy storage medium in the energy storage heat exchanger 203(a), and stores most of the heat of the high-temperature compressed air in the heat storage system. The air outlet of the energy storage heat exchanger 203(a) is connected with the compressed air inlet pipeline 111 of the energy-saving and water-removing system 1(a). The structure and working mode of the energy-saving and water-removing system 1(a) in this embodiment are the same as those of the energy-saving and water-removing system 1 in the first embodiment, and will not be described here again.

[0059] The compressed air reacts with the first or second regenerated dehydrating agent in the energy-saving and water-removing system 1(a), so that the water vapor in the compressed air is absorbed into the regenerated dehydrating agent, reducing the moisture content of the compressed air. At the same time, after the high-temperature compressed air is dehydrated, it exchanges heat with the external air in the energy-saving and water-removing system 1(a), further reducing the temperature of the compressed air, so that the temperature of the compressed air meets the temperature and pressure requirements at the inlet of the second-stage compressor 202(b).

[0060] The compressed air outlet pipeline 112 of the energy-saving and water-removing system 1(a) is connected with the second-stage compressor 202(b), which compresses the compressed air after being cooled and dehydrated. The compressed air at the outlet of the second-stage compressor 202(b) is further compressed, and the compressed air after being compressed twice enters the energy storage heat exchanger 203(b) through the compressed air pipeline 201, exchanges heat with the energy storage medium in the energy storage heat exchanger 203(b), and stores most of the heat of the compressed air in the heat storage system. The air outlet of the energy storage heat exchanger 203(b) is connected with the compressed air inlet 111 in the energy-saving and water-removing system 1(b), and the compressed air reacts with the first or second regenerated dehydrating agent in the energy-saving and water-removing system 1(b), so that the water vapor in the compressed air is absorbed into the regenerated dehydrating agent, reducing the moisture content of the compressed air. At the same time, after the high-temperature compressed air is dehydrated, it exchanges heat with the external air in the energy-saving and water-removing system 1(b), further reducing the temperature of the compressed air. At this time, the pressure and temperature of the compressed air meet the pressure and temperature requirements at the inlet of the gas storage. The compressed air outlet 112 of the energy-saving and water-removing system 1(b) is connected with the gas storage 204, and the high-pressure compressed air is stored in the gas storage 204.

[0061] Similarly, the structure and working mode of the energy-saving and water-removing system 1(b) in this embodiment are the same as those of the energy-saving and water-removing system 1 in the first embodiment, and will not be described here again.

[0062] It should be noted that although in the present embodiment, the compressed air energy storage system 2 replaces all the coolers and gas-liquid separators in the prior art with the energy-saving water removal system 1(a) or the energy-saving water removal system 1(b). However, the present application is not limited to this. According to the relative humidity of the air and the water removal effect of the device, it can not be necessary to replace all the coolers and gas-liquid separators. If the relative humidity of the air is low and the water removal effect of the device is good, the energy-saving water removal system 1(a) or the energy-saving water removal system 1(b) of the present application is selected for use at one or more places. 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.

[0063] In the above manner, the energy-saving water removal system 1(a) or the energy-saving water removal system 1(b) replaces the gas-liquid separator and cooler in the prior art compressed air energy storage system 2, so that the high-temperature compressed air can achieve the effects of cooling and gas-liquid separation in the energy-saving water removal system 1(a) or the energy-saving water removal system 1(b). This avoids the situation where the outlet temperature of the energy storage heat exchanger 203 and the outlet temperature of the cooler in the heat exchange system are less than the dew point temperature of the air at the corresponding pressure, causing water vapor in the compressed air to precipitate and condense on the inner wall of the energy storage heat exchanger 203 and the cooler, resulting in equipment corrosion and damage, which seriously affects the service life of the equipment. This reduces the instability of the compressed air energy storage system caused by equipment corrosion and damage, and also reduces the economic losses caused by equipment maintenance and replacement.

[0064] It should be noted that although in the present embodiment, the first-stage compressor 202(a), the energy storage heat exchanger 203(a), the energy-saving water removal system 1(a), the second-stage compressor 202(b), the energy storage heat exchanger 203(b), the energy-saving water removal system 1(b), and the gas storage 204 are connected in sequence through the compressed air pipeline 201 (i.e., two-stage compression). However, the present application is not limited to this. According to the energy storage scale, multi-stage compression can also be used.

[0065] The above is only a preferred embodiment of the present application and does not limit the present application. Any modifications, equivalent replacements, 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. An energy-saving water removal system, comprising: a first housing, in which a first regenerative water removal agent is disposed; a second housing, in which a second regenerative water removal agent is disposed; a first housing air inlet valve, one end of which is connected to the first housing and the other end of which is connected to a compressed air inlet line; a second housing air inlet valve, one end of which is connected to the second housing and the other end of which is connected to the compressed air inlet line; a first housing outlet side check valve, one end of which is connected to the first housing and the other end of which is connected to a compressed air outlet line; a second housing outlet side check valve, one end of which is connected to the second housing and the other end of which is connected to the compressed air outlet line; a first housing outlet side regeneration check valve, one end of which is connected to the first housing and the other end of which is connected to an external air line; a second housing outlet side regeneration check valve, one end of which is connected to the second housing and the other end of which is connected to the external air line; a first housing inlet side regeneration valve, one end of which is connected to the first housing and the other end of which is connected to the second housing; a second housing inlet side regeneration valve, one end of which is connected to the second housing and the other end of which is connected to the first housing inlet side regeneration valve; characterized in that it further comprises: a compressed air-external air heat exchanger, one side of which is disposed in the compressed air outlet line and the other side of which is disposed in the external air line, the outlet of the other side of the compressed air-external air heat exchanger being connected to the first housing outlet side regeneration check valve and the second housing outlet side regeneration check valve.

2. The energy efficient water removal system of claim 1, wherein, further comprising: an electric heater, which is disposed in the external air line between the compressed air-external air heat exchanger and the first housing outlet side regeneration check valve or the second housing outlet side regeneration check valve.

3. The energy efficient water removal system of claim 2, wherein, further comprising: a muffler, one end of which is disposed in connection with the first housing inlet side regeneration valve and / or the second housing inlet side regeneration valve and the other end of which is connected to the atmosphere.

4. The energy efficient water removal system of claim 3, wherein, further comprising a fan, which is disposed in the external air line.

5. The energy-saving water removal system according to claim 4, wherein: the first regenerative water removal agent and / or the second regenerative water removal agent is at least one selected from the group consisting of a zeolite, an activated alumina, a molecular sieve, a silica gel, and ethylene glycol.

6. A compressed air energy storage system comprising at least a first stage compressor, an energy saving water removal system, and a second stage compressor, in series communication in the direction of compressed air flow, characterized in that, the energy-saving water removal system is the energy-saving water removal system according to any one of claims 1 to 5, and the compressed air inlet line is connected to the first-stage compressor outlet.

7. The compressed air energy storage system of claim 6, wherein, further comprising: a gas storage, which is connected to the compressed air outlet line of the energy-saving water removal system.

8. The compressed air energy storage system of claim 6, wherein, further comprising: a storage heat exchanger, which is disposed between the first-stage compressor and the energy-saving water removal system.

9. The compressed air energy storage system of claim 6, wherein, further comprising: an inlet filter, which is disposed at the inlet of the first-stage compressor.

10. The compressed air energy storage system of claim 6, wherein, further comprising: a second muffler, which is disposed at the inlet of the first-stage compressor.

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