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

Abstract

The invention provides an energy-saving water removal system and a compressed air energy storage system using the energy-saving water removal system. According to the system, a water removal device is additionally arranged on the basis of the compression side of an existing multi-section compressed air energy storage system, and an air heat exchanger is used for replacing an original cooler. A waste heat utilization drying method is adopted, compressed air can be dehydrated and dried, the moisture content and the dew point temperature of the compressed air are reduced, condensation and precipitation of water vapor are avoided, the corrosion rate of equipment is delayed, waste heat of the compressed air can be utilized to enable an adsorbent to be subjected to regeneration cycle operation repeatedly in a specified period, and the energy utilization rate of the system is increased.

Description

Technical Field

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

[0007] In addition, the compressed air inlet temperature of the air cooler in the heat exchange system is relatively high. After heat exchange in the cooler, this part of the heat is directly dissipated into the atmosphere in the form of waste heat, resulting in a large waste of energy. Summary of the invention

[0008] In view of the above problems, the present invention provides an energy-saving dehydration system suitable for compressed air energy storage and a compressed air energy storage system using the energy-saving dehydration system. The energy-saving dehydration system can use a dehydrating agent to dehydrate and dry the compressed air, thereby reducing the relative humidity and moisture content of the compressed air, as well as the dew point temperature of the compressed air during subsequent compression and heat exchange processes, thereby avoiding condensation and precipitation of water vapor, and can utilize the waste heat of the compressed air to repeatedly regenerate the dehydrating agent within a specified period to achieve a cyclic operation.

[0009] The first aspect of the present invention provides an energy-saving water removal system, comprising: a first shell with a first regenerative dehydrating agent built in; a second shell with a second regenerative dehydrating agent built in; a first shell air intake valve having one end connected to the first shell and the other end connected to a compressed air inlet pipeline; a second shell air intake valve having one end connected to the second shell and the other end connected to a compressed air inlet pipeline; a first shell outlet-side check valve having one end connected to the first shell and the other end connected to a compressed air outlet pipeline; a second shell outlet-side check valve having one end connected to the second shell and the other end connected to a compressed air outlet pipeline; a first shell outlet-side check valve having one end connected to the second shell and the other end connected to a compressed air outlet pipeline; a A regeneration check valve on the outlet side of the first shell; a regeneration check valve on the outlet side of the second shell connected to the second shell at one end and connected to the external air pipeline at the other end; a regeneration valve on the inlet side of the first shell connected to the first shell at one end and connected to the second shell at the other end; a regeneration valve on the inlet side of the second shell connected to the first shell at one end and connected to the second shell at the other end; a regeneration valve on the inlet side of the second shell connected to the regeneration valve on the inlet side of the first shell at one end and connected to the second shell at the other end; a compressed air-external air heat exchanger having a primary side arranged in the compressed air outlet pipeline and a secondary side arranged in the external air pipeline, wherein the outlet on the secondary side of the compressed air-external air heat exchanger is connected to the regeneration check valve on the outlet side of the first shell and the regeneration check valve on the outlet side of the second shell.

[0010] According to the technical solution, the high-temperature and high-pressure compressed air can be controlled to enter the first shell (or the second shell) for dehydration by switching the valve, and the high-temperature external air can enter the second shell (or the first shell) to desorb the built-in regenerative dehydrating agent. Taking the example of introducing high-temperature compressed air into the first shell for dehydration and introducing high-temperature external air into the second shell for desorption of the regenerative dehydrating agent, the high-temperature and high-pressure compressed air flows into the energy-saving dehydration system through the first shell air inlet valve, and the compressed air is fully contacted with the first regenerative dehydrating agent in the first shell. The water vapor in the compressed air is adsorbed by the first regenerative dehydrating agent, and the relative humidity, moisture content and dew point temperature decrease. The dehydrated compressed air flows into the primary side of the compressed air-external air heat exchanger through the check valve on the outlet side of the first shell, and exchanges heat with the air from the outside on the secondary side. At this time, since the compressed air has been dehydrated in the first shell, there is no water vapor condensation in the compressed air-external air heat exchanger.

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

[0012] Afterwards, the first shell and the second shell can be switched, that is, high-temperature compressed air is introduced into the second shell for dehydration, and high-temperature external air is introduced into the first shell to desorb the regenerated dehydrating agent, and the first shell and the second shell are switched repeatedly to achieve uninterrupted dehydration of the compressed air.

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

[0014] In an optional technical solution, it also includes: an electric heater 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 solution, the external air after heat exchange with high-temperature compressed air in the compressed air-external air heat exchanger is reheated by an electric heater, thereby avoiding the problem that the external air cannot reach the dehydrating agent regeneration temperature after heat exchange with high-temperature compressed air in the compressed air-external air heat exchanger, thereby affecting the regeneration of the dehydrating agent.

[0016] In an optional technical solution, it also includes: a muffler having one end connected to the first shell inlet side regeneration valve and / or the second shell inlet side regeneration valve and the other end connected to the atmosphere.

[0017] According to this technical solution, high-temperature external air reacts with the second regenerative dehydrating agent in the second shell, and then the second regenerative dehydrating agent is regenerated and flows to the muffler through the regeneration valve on the inlet side of the second shell, and then is discharged into the atmosphere through the muffler, thereby reducing the noise generated during the operation of the energy-saving dehydration system.

[0018] In the optional technical solution, it also includes: a fan arranged on the external air pipeline.

[0019] According to the technical solution, external air is introduced into the energy-saving dehydration system through a fan, and a driving force is provided for the flow of external air in the external air pipeline, so that it exchanges heat 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 dehydrating agent after absorbing water in the first shell or the second regenerated dehydrating agent after absorbing water in the second shell, thereby completing the regeneration of the first regenerated dehydrating agent or the second regenerated dehydrating agent.

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

[0021] According to the technical solution, when one of zeolite, activated alumina, molecular sieve, silica gel, and ethylene glycol is selected as the first regeneration dehydrating agent and / or the second regeneration dehydrating agent, it is reversible. When the temperature in the first shell or the second shell reaches the regeneration temperature, the water in the first regeneration dehydrating agent or the second regeneration dehydrating agent is desorbed at high temperature, and the regeneration of the first regeneration dehydrating agent or the second regeneration dehydrating agent is achieved.

[0022] Another aspect of the present invention provides a compressed air energy storage system, comprising at least a first-stage compressor, an energy-saving water removal system, and a second-stage compressor connected in sequence according to the flow direction of compressed air, characterized in that the energy-saving water removal system is an energy-saving water removal system provided by any of the above-mentioned technical solutions, and the compressed air inlet pipeline is connected to the outlet of the first-stage compressor.

[0023] According to the technical solution, an energy-saving water removal system 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 energy-saving water removal system 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, which causes the water vapor in the compressed air to precipitate and condense on the inner wall of the heat exchanger and the cooler, causing corrosion and damage to the equipment, seriously affecting the service life of the equipment. The unstable operation of the compressed air energy storage system caused by equipment corrosion and damage is reduced, and the economic losses caused by equipment maintenance and replacement are also reduced. The purpose of cooling the compressed air is achieved by controlling the heat exchange between the compressed air and the external air in the energy-saving water removal system, and at the same time, the waste heat of the compressed air is reused, thereby improving the utilization rate of energy and achieving the purpose of energy saving.

[0024] 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 energy-saving water removal system.

[0025] 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.

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

[0027] According to the technical solution, the high-temperature compressed air entering the energy storage heat exchanger from the compressor outlet 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 solution, the compressed air energy storage system further includes: an inlet filter arranged at the inlet of the first-stage compressor.

[0029] 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.

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

[0031] According to the technical solution, a second 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

[0032] Figure 1 Schematic diagram of a 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 the present application.

[0034] 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 energy-saving water removal system in the first embodiment of the present application to replace the gas-liquid separator and the cooler.

[0035] Reference numerals: energy-saving water removal system 1; first shell 101; second shell 102; first shell air inlet valve 103; second shell air inlet valve 104; first shell outlet side check valve 105; second shell outlet side check valve 106; first shell outlet side regeneration check valve 107; second shell outlet side regeneration check valve 108; first shell inlet side regeneration valve 109; second shell inlet side 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 water removal system 1(a); second-stage compressor 202(b); heat exchanger 203(b); energy-saving water removal system 1(b); air storage reservoir 204; inlet filter 205; second silencer 206. DETAILED DESCRIPTION

[0036] 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.

[0037] <First Embodiment>

[0038] Figure 2 This is a schematic diagram of the energy-saving water removal system in the first embodiment of the present application. Figure 2 As shown, the energy-saving water removal system 1 of the first embodiment of the present invention includes: a first shell 101; a second shell 102; a first shell air intake valve 103; a second shell air intake valve 104; a first shell outlet side check valve 105; a second shell outlet side check valve 106; a first shell outlet side regeneration check valve 107; a second shell outlet side regeneration check valve 108; a first shell inlet side regeneration valve 109; a second shell 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] like Figure 2 As shown, the energy-saving dehydration system 1 is composed of a first shell 101 with a first regenerative dehydrating agent built in, and a second shell 102 with a second regenerative dehydrating agent built in, which are connected in parallel between a compressed air inlet pipeline 111 and a compressed air outlet pipeline 112. Among them, a first shell air intake valve 103 is provided on the inlet side of the first shell 101, one end of which is connected to the first shell 101 and the other end of which is connected to the compressed air inlet pipeline 111, and a first shell outlet side check valve 105 is provided on the outlet side of the first shell 101, one end of which is connected to the first shell 101 and the other end of which is connected to the compressed air outlet pipeline 112. A second shell air intake valve 104 is provided on the inlet side of the second shell 102, one end of which is connected to the second shell 102 and the other end of which is connected to the compressed air inlet pipeline 111, and a second shell outlet side check valve 106 is provided on the outlet side of the second shell 102, one end of which is connected to the second shell 102 and the other end of which is connected to the compressed air outlet pipeline 112.

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

[0041] In the energy-saving dewatering system 1, a compressed air-external air heat exchanger 114 is provided at the compressed air outlet pipeline 112 and the external air pipeline 113, wherein the primary side is provided at the compressed air outlet pipeline 112, and the secondary side is provided at the external air pipeline 113. The outlet of the secondary side of the compressed air-external air heat exchanger 114 is connected with the regeneration check valve 107 on the outlet side of the first shell and the regeneration check valve 108 on the outlet side of the second shell. The primary side of the compressed air-external air heat exchanger 114 is a high-temperature side, which introduces the high-temperature compressed air in the compressed air outlet pipeline 112, and the secondary side is a low-temperature side, which introduces the low-temperature external air from the outside of the energy-saving dewatering system 1 through the external air pipeline 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, and the low-temperature external air is heated while the high-temperature compressed air is cooled.

[0042] Preferably, if 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 muffler 116; a fan 117

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

[0044] A muffler 116 connected to the atmosphere is provided on the pipeline between the first shell inlet side regeneration valve 109 and the second shell inlet side regeneration valve 110, and the external air flowing out through the first shell inlet side regeneration valve 109 or the second shell inlet side regeneration valve 110 is discharged into the atmosphere through the muffler 116.

[0045] A fan 117 is also provided at the inlet of the external air pipeline 113, through which the external low-temperature air is introduced into the internal air pipeline 113 and a driving force is provided for the low-temperature external air.

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

[0047] The energy-saving dehydration system 1 in the above embodiment of the present invention can dehydrate the compressed air by using the first regenerated dehydrating agent in the first shell 101 through valve switching control, and at the same time, the second regenerated dehydrating agent in the second shell 102 is desorbed and regenerated by high-temperature air (first mode). Or the first regenerated dehydrating agent in the first shell 101 is desorbed and regenerated by high-temperature air, and at the same time, the compressed air is dehydrated by using the second regenerated dehydrating agent in the second shell 102 (second mode). In the following description, the energy-saving dehydration system will be described as an example in which the first regenerated dehydrating agent in the first shell 101 is used to dehydrate the compressed air through valve switching, and the second regenerated dehydrating agent in the second shell 102 is desorbed and regenerated by high-temperature air, that is, the energy-saving dehydration system is in the first mode.

[0048] According to this embodiment, high-temperature compressed air enters the energy-saving dehydration system 1 through the compressed air inlet pipeline 111. At this time, the energy-saving dehydration 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, and 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 regeneration dehydrating agent in the first shell 101, so that the water vapor in the compressed air is adsorbed into the first regeneration dehydrating agent, thereby achieving dehydration of the compressed air. After the dehydration is completed, the compressed air flows through the first shell outlet side check valve 105 and then flows into the compressed air outlet pipeline 112, and is transported from the compressed air outlet pipeline 112 to the primary side of the compressed air-external air heat exchanger 114, and heat is exchanged with the low-temperature external air in the compressed air-external air heat exchanger 114. The cooled compressed air then continues to flow out along the compressed air outlet pipeline 112.

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

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

[0051] In the above embodiment, the first regenerative dehydrating agent or the second regenerative dehydrating agent adsorbs water vapor in the compressed air, 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.

[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 external air is heated by the waste heat of the compressed air, which cools the compressed air while also initially heating the external air. This realizes the utilization of the waste heat of the compressed air, improves the energy utilization rate to a certain extent, and achieves the purpose of energy saving.

[0053] Although in this embodiment, the first regenerated dehydrating agent and / or the second regenerated dehydrating agent is described as being at least one selected from zeolite, activated alumina, molecular sieve, silica gel, and ethylene glycol, the present application is not limited to this. As long as other physical adsorption dehydration or chemical adsorption dehydration methods can achieve desorption and regeneration of the dehydrating agent through 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, which is equipped with the energy-saving water removal system 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.

[0056] Figure 3 Schematic diagram of a compressed air energy storage system 2 using an energy-saving water removal system 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, an energy-saving water removal system, 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 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 air storage reservoir 204, which are sequentially connected through a compressed air pipeline 201, are used as an example (i.e., two-stage compression) for explanation.

[0057] Preferably, an inlet filter 205 and a second silencer 206 are also provided at the inlet of the first-stage compressor 202 ( a ).

[0058] 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 energy storage heat exchanger 203 (a) from the compressed air pipeline 201, and exchanges heat with the energy storage medium in the energy storage heat exchanger 203 (a), storing 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 to the compressed air inlet pipeline 111 of the energy-saving water removal system 1 (a). The structure and working mode of the energy-saving water removal system 1 (a) in this embodiment are the same as those of the energy-saving water removal system 1 in the first embodiment, and will not be repeated here.

[0059] The compressed air reacts with the first regenerative dehydrating agent or the second regenerative dehydrating agent in the energy-saving dehydration system 1(a), so that the water vapor in the compressed air is absorbed into the regenerative dehydrating agent, thereby 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 outside air in the energy-saving dehydration system 1(a), further reducing the temperature of the compressed air so that the compressed air temperature meets the temperature and pressure requirements at the inlet of the second compressor 202(b).

[0060] The compressed air outlet pipeline 112 of the energy-saving dehydration system 1(a) is connected to the second compressor 202(b), and the compressed air after cooling and dehydration is compressed twice. The compressed air pressure at the outlet of the second compressor 202(b) is further increased. The compressed gas after secondary compression enters the energy storage heat exchanger 203(b) from the compressed air pipeline 201, and performs heat exchange with the energy storage medium in the energy storage 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 energy storage heat exchanger 203(b) is connected to the compressed air inlet 111 in the energy-saving dehydration system 1(b), and reacts with the first regenerative dehydrating agent or the second regenerative dehydrating agent in the energy-saving dehydration system 1(b), so that the water vapor in the compressed air is absorbed into the regenerative 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 dehydration 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 entrance of the gas storage reservoir. The compressed air outlet 112 of the energy-saving water removal system 1 (b) is connected to the air storage reservoir 204 to store the high-pressure compressed air in the air storage reservoir 204.

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

[0062] 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 an energy-saving water removal system 1 (a) or an energy-saving water removal system 1 (b). However, the present invention is not limited to this. Depending on the relative humidity of the air and the water removal 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 water removal effect of the device is good, select one or more places to use the energy-saving water removal system 1 (a) or the energy-saving water removal system 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.

[0063] Through the above method, the gas-liquid separator and cooler in the compressed air energy storage system 2 of the prior art are replaced by the energy-saving water removal system 1 (a) or the energy-saving water removal system 1 (b), 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), and avoid 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 lower than the air dew point temperature under the corresponding pressure, resulting in the precipitation of water vapor in the compressed air and condensation on the energy storage heat exchanger 203 and the inner wall of the cooler, causing equipment corrosion damage, 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.

[0064] It should be noted that, although in this 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 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.

[0065] 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. An energy-saving water removal system, comprising: A first shell body having a first regeneration dehydrating agent built therein; A second shell body having a second regeneration dehydrating agent built therein; 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 pipeline; 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 pipeline; A check valve at the outlet side of the first housing, one end of which is connected to the first housing and the other end of which is connected to the compressed air outlet pipeline; A check valve at the outlet side of the second housing, one end of which is connected to the second housing and the other end of which is connected to the compressed air outlet pipeline; a regeneration check valve at the outlet side of the first housing, one end of which is connected to the first housing and the other end of which is connected to an external air pipeline; a regeneration check valve at the outlet side of the second housing, one end of which is connected to the second housing and the other end of which is connected to the external air pipeline; A regeneration valve at the inlet side of the first shell, one end of which is connected to the first shell and the other end of which is connected to the second shell; A regeneration valve at the inlet side of the second shell, one end of which is connected to the second shell, and the other end of which is connected to the regeneration valve at the inlet side of the first shell; It is characterized by also including: A compressed air-external air heat exchanger, whose primary side is arranged in the compressed air outlet pipeline, and whose secondary side is arranged in the external air pipeline, and the outlet of the secondary side of the compressed air-external air heat exchanger is connected to the first shell outlet side regeneration check valve and the second shell outlet side regeneration check valve.

2. The energy-saving water removal system according to claim 1, characterized in that: Also includes, The electric heater is 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.

3. The energy-saving water removal system according to claim 2, characterized in that: Also includes, The muffler has one end connected to the first shell inlet side regeneration valve and / or the second shell inlet side regeneration valve, and the other end connected to the atmosphere.

4. The energy-saving water removal system according to claim 3, characterized in that: It also includes a fan, which is arranged in the external air pipeline.

5. The energy-saving water removal system according to claim 4, characterized in that: The first regenerated dehydrating agent and / or the second regenerated dehydrating agent is at least one selected from zeolite, activated alumina, molecular sieve, 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 connected in sequence according to the flow direction of compressed air, 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 pipeline is connected to the outlet of the first-stage compressor.

7. The compressed air energy storage system according to claim 6, characterized in that: Also includes, The air storage reservoir is connected to the compressed air outlet pipeline of the energy-saving water removal system.

8. The compressed air energy storage system according to claim 6, characterized in that: Also includes, The energy storage heat exchanger is arranged between the first-stage compressor and the energy-saving water removal system.

9. The compressed air energy storage system according to claim 6, characterized in that: Also includes, An inlet filter is arranged at the inlet of the first-stage compressor.

10. The compressed air energy storage system according to claim 6, characterized in that: Also includes, The second muffler is arranged at the inlet of the first-stage compressor.

Images