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

Abstract

The present invention provides an energy-saving dehydration system and a compressed air energy storage system utilizing the same. This system adds a dehydration device to the compression side of an existing multi-stage compressed air energy storage system and replaces the existing cooler with an air heat exchanger. A dehydrating agent is circulated and regenerated between two shells to reduce the moisture content and dew point of the compressed air, preventing the condensation and precipitation of water vapor and slowing the corrosion rate of equipment. The system also utilizes the waste heat of the compressed air to repeatedly regenerate the adsorbent within a specified period, thereby improving the system's energy efficiency.

Description

Technical Field

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

[0002] my country's energy consumption structure is currently shifting from one dominated by fossil fuels to one dominated by new energy sources. Renewable energy sources, such as solar and wind power, are developing rapidly. However, renewable power generation is subject to significant randomness and volatility, influenced by environmental and weather factors. To mitigate the impact of large-scale renewable energy integration on the power grid, significant development of energy storage technologies is necessary.

[0003] Compressed air energy storage (CAES) is one of the most mature physical energy storage technologies, besides pumped hydro. It offers advantages such as long storage time, large storage capacity, and high efficiency. CAES is primarily composed of subsystems including a compression system, a heat exchange system, a heat storage system, a gas storage system, and a turbine expansion system.

[0004] Figure 1 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, consisting of a heat exchanger, gas-liquid separator, and cooler, is a crucial component of a compressed air energy storage system. It plays a vital role and accounts for a significant portion of the investment. In the design and actual operation of compressed air energy storage systems, due to considerations of the overall system's thermal balance or high air humidity, the outlet temperatures of the heat exchanger and cooler often fall below the dew point of the air at the corresponding pressure. This causes water vapor in the compressed air to precipitate and condense on the inner walls of the heat exchanger and cooler, leading to corrosion and damage to the equipment, seriously shortening its service life. This can severely impact the stable operation of the entire compressed air energy storage system and result in significant economic losses from equipment repair and replacement.

[0006] Therefore, in the design and application of compressed air systems, the condensation of water vapor in compressed air must be given great attention. 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 operating. The amount of water entering the compressed air system per unit time is related to the air compressor displacement, 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 compressed air pressure and temperature. Especially in the multi-stage compression process, the compressed air pressure continues to increase. When the moisture content of the compressed air remains unchanged, the dew point temperature of the compressed air continues to rise. 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. This part of the heat is directly dissipated into the atmosphere in the form of waste heat after heat exchange in the cooler, resulting in a large waste of energy. Summary of the Invention

[0008] In response to 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 the 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 cyclic operation.

[0009] A first aspect of the present invention provides an energy-saving dehydration system, comprising: a first shell having a compressed air inlet and a first shell dehydrating agent outlet at its bottom and a compressed air outlet and a first shell dehydrating agent inlet at its upper portion; a second shell having a second shell dehydrating agent inlet and a second shell dehydrating agent outlet, a compressed air outlet pipeline connected to the compressed air outlet; a dehydrating agent regeneration pipeline connected to the first shell dehydrating agent outlet and the second shell dehydrating agent inlet; a dehydrating agent circulation pipeline connected to the second shell dehydrating agent outlet and the first shell dehydrating agent inlet; and a compressed air-dehydrating agent heat exchanger having a primary side arranged in the compressed air outlet pipeline and a secondary side arranged in the dehydrating agent regeneration pipeline, wherein the inlet of the secondary side of the compressed air-dehydrating agent heat exchanger is connected to the first shell dehydrating agent outlet, and the outlet of the secondary side of the compressed air-dehydrating agent heat exchanger is connected to the second shell dehydrating agent inlet.

[0010] According to this technical solution, when high-temperature, high-pressure compressed air enters the first shell through the compressed air inlet, it comes into contact with the dehydrating agent entering the first shell through the dehydrating agent inlet, where it is dehydrated. Water vapor in the compressed air is adsorbed by the dehydrating agent, reducing its relative humidity, moisture content, and dew point. The dehydrated compressed air then flows through the compressed air outlet into the compressed air outlet pipeline. On the primary side of the compressed air-dehydrating agent heat exchanger, it exchanges heat with dehydrating agent from the dehydrating agent regeneration pipeline on the secondary side. Since the compressed air has already been dehydrated in the first shell, no water vapor condenses in the compressed air-dehydrating agent heat exchanger.

[0011] At the same time, the dehydrating agent flowing from the first shell's dehydrating agent outlet into the secondary side of the compressed air-dehydrating agent heat exchanger heats up after exchanging heat with the compressed air. It then enters the second shell through the second shell's dehydrating agent inlet, where the water in the dehydrating agent is desorbed at high temperature. After completing the dehydrating agent regeneration process, the dehydrating agent flows through the dehydrating agent circulation pipeline into the first shell to dehydrate the compressed air. This cycle continuously achieves uninterrupted dehydration of the compressed air.

[0012] The technical solution of the present invention effectively avoids the problem, in the prior art, of the heat exchanger outlet temperature falling below the dew point of the compressed air at the corresponding pressure, which causes water vapor in the compressed air to precipitate and condense on the inner walls of the heat exchanger and cooler, leading to corrosion and damage to the equipment, seriously shortening its service life. Furthermore, the dehydrated compressed air exchanges heat with the dehydrating agent in the compressed air-dehydrating agent heat exchanger, reusing the compressed air's waste heat, improving energy utilization and achieving energy conservation.

[0013] In an optional technical solution, the energy-saving water removal system further includes: a circulation pump arranged in the dehydrating agent circulation pipeline.

[0014] According to this technical solution, a circulation pump is provided in the dehydrating agent circulation pipeline connecting the dehydrating agent outlet of the second shell and the dehydrating agent inlet of the first shell. The dehydrating agent after dehydration in the second shell can be pumped into the first shell through the circulation pump, thereby completing the regeneration and water removal cycle of the dehydrating agent.

[0015] In an optional technical solution, the energy-saving water removal system further includes: a humidity sensor arranged in the compressed air outlet pipeline.

[0016] According to this technical solution, a humidity sensor installed in the compressed air outlet pipeline can monitor the humidity of the compressed air flowing out of the first housing in real time to determine whether the desired compressed air dehumidification effect is being achieved. If not, measures such as adjusting the flow rate at the compressed air inlet of the first housing or adjusting the flow rate at the dehydrating agent inlet of the first housing can be taken based on the humidity sensor's detection results to achieve the desired compressed air dehumidification effect.

[0017] In an optional technical solution, the regeneration dehydrating agent flowing in the first shell and the second shell is at least one selected from ethylene glycol, lithium bromide, diethylene glycol, triethylene glycol, and tetraethylene glycol.

[0018] According to this technical solution, when one of ethylene glycol, lithium bromide, diethylene glycol, triethylene glycol, and tetraethylene glycol is selected as the dehydrating agent, the dehydrating agent is reversible. When the regeneration conditions are met in the second shell, the water in the dehydrating agent is desorbed, thereby achieving regeneration of the dehydrating agent.

[0019] Another aspect of the present invention provides a compressed air energy storage system, which includes 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. It is 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 of the first shell is connected to the outlet of the first-stage compressor.

[0020] According to this technical solution, an energy-saving dehydration 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 at the same time in the energy-saving dehydration system, 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 water vapor in the compressed air to precipitate and condense on the inner wall of the heat exchanger and 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 corrosion and damage to the equipment is reduced, and the economic losses caused by equipment maintenance and replacement are also reduced. By controlling the heat exchange between the compressed air and the dehydrating agent from the dehydrating agent regeneration pipeline on the secondary side in the energy-saving dehydration system, the purpose of cooling the compressed air is achieved, and the waste heat of the compressed air is also reused, thereby improving the utilization rate of energy and achieving the purpose of energy saving.

[0021] In an optional technical solution, the compressed air energy storage system further includes: an air storage reservoir connected to the compressed air outlet pipeline of the energy-saving water removal system.

[0022] 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 long-term, reducing the impact of renewable energy grid connection.

[0023] In an optional technical solution, the compressed air energy storage system further includes: an energy storage heat exchanger arranged between the first-stage compressor and the energy-saving water removal system.

[0024] According to this 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.

[0025] 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.

[0026] According to this 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.

[0027] 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.

[0028] According to this technical solution, a second muffler is provided at the inlet of the compressed air energy storage system, thereby reducing the noise generated during the operation of the compressed air energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of a compressed air energy storage system in the prior art.

[0030] Figure 2 This is a schematic diagram of the energy-saving water removal system in the first embodiment of the present application.

[0031] Figure 3 This 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.

[0032] Figure 1: Energy-saving dehydration system 1; first shell 101; second shell 102; compressed air inlet 103; compressed air outlet 104, first shell dehydration agent inlet 1011; first shell dehydration agent outlet 1012; second shell dehydration agent inlet 1021; second shell dehydration agent outlet 1022; compressed air outlet pipeline A; dehydration agent regeneration pipeline B; dehydration agent circulation pipeline C; compressed air-dehydration agent heat exchanger 105; circulation pump 106; humidity sensor 107; compressed air energy storage system 2; compressed air pipeline 201; first stage compressor 202(a); heat exchanger 203(a); energy-saving dehydration system 1(a); second stage compressor 202(b); heat exchanger 203(b); energy-saving dehydration system 1(b); air storage reservoir 204; inlet filter 205; second silencer 206. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0034] <First embodiment>

[0035] 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 water removal system 1 according to the first embodiment of the present invention includes a first housing 101 and a second housing 102. A compressed air inlet 103 and a first housing dehydrating agent outlet 1012 are provided at the bottom of the first housing 101, and a compressed air outlet 104 and a first housing dehydrating agent inlet 1011 are provided at the top of the first housing 101. A second housing dehydrating agent inlet 1021 and a second housing dehydrating agent outlet 1022 are provided in the second housing 102. Specifically, the second housing dehydrating agent outlet 1022 is located closer to the top of the second housing 102 than the second housing dehydrating agent inlet 1021. A compressed air outlet pipeline A is provided in communication with the compressed air outlet 104. A dehydrating agent regeneration pipeline B is provided in communication with the first housing dehydrating agent outlet 1012 and the second housing dehydrating agent inlet 1021. A dehydrating agent circulation pipeline C is provided in communication with the second housing dehydrating agent outlet 1022 and the first housing dehydrating agent inlet 1011. A compressed air-dehydrating agent heat exchanger 105 is also provided. The primary side of the compressed air-dehydrating agent heat exchanger 105 is located in the compressed air outlet pipeline A. That is, the compressed air flowing through the compressed air outlet pipeline A flows through the primary side of the compressed air-dehydrating agent heat exchanger 105. The secondary side of the compressed air-dehydrating agent heat exchanger 105 is located in the dehydrating agent regeneration pipeline B. That is, the dehydrating agent flowing through the dehydrating agent regeneration pipeline B flows through the secondary side of the compressed air-dehydrating agent heat exchanger 105. The inlet of the secondary side of the compressed air-dehydrating agent heat exchanger 105 is connected to the dehydrating agent outlet 1012 of the first shell, and the outlet of the secondary side of the compressed air-dehydrating agent heat exchanger 105 is connected to the dehydrating agent inlet 1021 of the second shell.

[0036] like Figure 2 As shown, the energy-saving dehydration system 1 consists of a first shell 101 and a second shell 102, each of which has a dehydrating agent flowing therein. When high-temperature, high-pressure compressed air from the outside enters the first shell 101 through the compressed air inlet 103 of the first shell 101, it comes into contact with the dehydrating agent entering the first shell 101 through the first shell dehydrating agent inlet 1011, thereby being dehydrated. Water vapor in the compressed air is adsorbed by the dehydrating agent, causing the relative humidity, moisture content, and dew point temperature to decrease. There are no specific restrictions on the contact method between the compressed air and the dehydrating agent within the first shell 101. The compressed air can be bubbled in the dehydrating agent, or the dehydrating agent can be sprayed in the form of a spray. As long as the compressed air and the dehydrating agent are in sufficient contact, the moisture in the compressed air can be fully adsorbed by the dehydrating agent.

[0037] The dehydrated compressed air flows into the compressed air outlet pipe A through the compressed air outlet 104 of the first shell 101 and flows through the compressed air-dehydrating agent heat exchanger 105 , that is, flows through the primary side of the compressed air-dehydrating agent heat exchanger 105 .

[0038] The dehydrating agent that has absorbed moisture flows out of the first shell dehydrating agent outlet 1012 located at the bottom of the first shell 101 and flows through the dehydrating agent regeneration pipeline B, that is, through the secondary side of the compressed air-dehydrating agent heat exchanger 105. Specifically, the primary side of the compressed air-dehydrating agent heat exchanger 105 is the high-temperature side, which introduces the high-temperature compressed air from the compressed air outlet pipeline A, and the secondary side is the low-temperature side, which introduces the dehydrating agent after the moisture has been absorbed.

[0039] At this time, the dehydrating agent flowing through the secondary side of the compressed air-dehydrating agent heat exchanger 105 exchanges heat with the compressed air on the primary side of the compressed air-dehydrating agent heat exchanger 105. At this time, since the compressed air has been dehydrated in the first shell, no water vapor will condense in the compressed air-dehydrating agent heat exchanger.

[0040] At the same time, the dehydrating agent flowing from the first shell dehydrating agent outlet 1012 into the secondary side of the compressed air-dehydrating agent heat exchanger 105 exchanges heat with the compressed air, causing its temperature to rise. The dehydrating agent then enters the second shell 102 through the second shell dehydrating agent inlet 1021. The water in the dehydrating agent is desorbed at high temperature, completing the dehydrating agent regeneration process. The dehydrating agent then flows into the first shell 101 through the dehydrating agent circulation line C to dehydrate the compressed air again. This cycle achieves dehydrating agent regeneration and uninterrupted dehydration of the compressed air.

[0041] The embodiments of the present invention effectively avoid the problem in the prior art where the heat exchanger outlet temperature falls below the dew point of the compressed air at the corresponding pressure, causing water vapor in the compressed air to precipitate and condense on the inner walls of the heat exchanger and cooler, leading to corrosion and damage to the equipment, seriously shortening its service life. Furthermore, the dehydrated compressed air exchanges heat with the dehydrating agent in the compressed air-dehydrating agent heat exchanger 105, reusing the waste heat of the compressed air, improving energy utilization, and achieving energy conservation.

[0042] Preferably, if Figure 2 As shown, the energy-saving water removal system 1 of the first embodiment of the present invention further includes: a circulation pump 106 arranged in the dehydrating agent circulation pipeline C, and a humidity sensor 107 arranged in the compressed air outlet pipeline A.

[0043] According to this preferred embodiment, a circulating pump 106 is provided in the dehydrating agent circulation pipeline C connecting the dehydrating agent outlet 1022 of the second shell and the dehydrating agent inlet 1011 of the first shell. Thus, the dehydrating agent, which has been dehydrated in the second shell 102, can be pumped into the first shell 101 via the circulating pump 106, thereby completing the regeneration and water removal cycle of the dehydrating agent. In particular, the provision of the circulating pump 106 not only controls the regeneration flow rate of the dehydrating agent, but also increases the degree of freedom in the relative positioning of the first shell 101 and the second shell 102. If the second shell 102 is positioned lower than the first shell 101, the desired pumping flow rate can be achieved by appropriately increasing the head of the circulating pump 106.

[0044] The humidity sensor 107, installed in the compressed air outlet pipe A, can monitor the humidity of the compressed air flowing out of the first housing 101 in real time to determine whether the desired compressed air dehumidification effect is achieved. If not, measures such as adjusting the flow rate of the compressed air inlet 103 of the first housing 101 or adjusting the flow rate of the dehydrating agent inlet 1011 of the first housing 101 can be taken based on the detection results of the humidity sensor 107 to achieve the desired compressed air dehumidification effect.

[0045] Preferably, the dehydrating agent used in this embodiment is at least one selected from ethylene glycol, lithium bromide, diethylene glycol, triethylene glycol, and tetraethylene glycol.

[0046] The energy-saving dehydration system 1 in the above embodiment of the present invention can continuously dehydrate the compressed air using the dehydrating agent and desorb and regenerate the dehydrating agent in the second shell 102 without switching the valve to control the flow path of the first shell 101 or the second shell 102.

[0047] Although in this embodiment, the dehydrating agent is described as being at least one selected from ethylene glycol, the present application is not limited to this. As long as the dehydrating agent is flowable and can be desorbed and regenerated, it should be included in the scope of protection of the present application.

[0048] <Second embodiment>

[0049] 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. The same names and symbols as those used in the other embodiments above are used for explanation and are not repeated here.

[0050] Figure 3 This is a 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 3As shown, the compressed air energy storage system 2 includes at least a compressor, a heat exchanger, an energy-saving water removal system, and an air storage reservoir, which are sequentially connected via a compressed air pipeline 201. The following description uses the example of a first-stage compressor 202(a), an energy storage heat exchanger 203(a), an energy-saving water removal system 1(a), a second-stage compressor 202(b), an energy storage heat exchanger 203(b), an energy-saving water removal system 1(b), and an air storage reservoir 204, which are sequentially connected via a compressed air pipeline 201 (i.e., two-stage compression).

[0051] Preferably, an inlet filter 205 and a second muffler 206 are further provided at the inlet of the first-stage compressor 202 ( a ).

[0052] 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 performs heat exchange 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.

[0053] In energy-saving dehydration system 1(a), the compressed air reacts with the regenerated dehydrating agent, absorbing water vapor from the compressed air into the regenerated dehydrating agent, reducing the compressed air's moisture content. Simultaneously, after dehydration, the high-temperature compressed air undergoes heat exchange with the dehydrating agent from the secondary side of the dehydrating agent regeneration pipeline within energy-saving dehydration system 1(a), further lowering the compressed air temperature to meet the temperature and pressure requirements at the inlet of the second-stage compressor 202(b).

[0054] The compressed air outlet pipeline 112 of the energy-saving dehydration system 1(a) is connected to the second-stage compressor 202(b), which performs a secondary compression on the compressed air after cooling and dehydration. The compressed air pressure at the outlet of the second-stage compressor 202(b) is further increased. The compressed air after secondary compression enters the energy storage heat exchanger 203(b) through the compressed air pipeline 201, where it undergoes heat exchange with the energy storage medium in the energy storage heat exchanger 203(b), storing most of the compressed air's heat in the heat storage system. The air outlet of the energy storage heat exchanger 203(b) is connected to the compressed air inlet 111 of the energy-saving dehydration system 1(b). Within the energy-saving dehydration system 1(b), the air reacts with the regenerated dehydrating agent, absorbing the water vapor in the compressed air into the regenerated dehydrating agent and reducing the moisture content of the compressed air. Simultaneously, after the high-temperature compressed air is dehydrated, it exchanges heat with the dehydrating agent from the secondary side of the dehydrating agent regeneration pipeline within the energy-saving dehydration system 1(b), further reducing the compressed air temperature. At this point, the compressed air pressure and temperature meet the pressure and temperature requirements at the gas storage inlet. The compressed air outlet 112 of the energy-saving water removal system 1 (b) is connected to the gas storage 204 to store the high-pressure compressed air in the gas storage 204.

[0055] Likewise, the structure and operation 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 here.

[0056] It should be noted that, although in this embodiment, the compressed air energy storage system 2 replaces all coolers and gas-liquid separators on the compression side in the prior art with the energy-saving water removal system 1 (a) or the 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, one or more of the energy-saving water removal system 1 (a) or the energy-saving water removal system 1 (b) of this application can be selected. 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 scope of protection of this application.

[0057] Through the above method, the gas-liquid separator and cooler in the prior art compressed air energy storage system 2 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). 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 lower than the dew point temperature of the air under 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 damage, seriously affecting the service life of the equipment. This reduces the unstable operation of the compressed air energy storage system due to equipment corrosion damage, and also reduces the economic losses caused by equipment maintenance and replacement.

[0058] It should be noted that although this embodiment uses a first-stage compressor 202(a), an energy storage heat exchanger 203(a), an energy-saving water removal system 1(a), a second-stage compressor 202(b), an energy storage heat exchanger 203(b), an energy-saving water removal system 1(b), and an air storage reservoir 204, which are sequentially connected via a compressed air pipeline 201, as an example (i.e., two-stage compression), the present invention is not limited thereto and may employ a multi-stage compression method depending on the energy storage scale.

[0059] The above is only a preferred embodiment of the present application and is not intended to 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 scope of protection of the present application.

Claims

1. An energy-saving water removal system, comprising: A first shell having a compressed air inlet and a first shell dehydrating agent outlet provided at its bottom and a compressed air outlet and a first shell dehydrating agent inlet provided at its upper portion; The second shell is provided with a second shell dehydrating agent inlet and a second shell dehydrating agent outlet; A compressed air outlet pipeline connected to the compressed air outlet; a dehydrating agent regeneration pipeline, communicating with the dehydrating agent outlet of the first shell and the dehydrating agent inlet of the second shell; The dehydrating agent circulation pipeline is connected to the dehydrating agent outlet of the second shell and the dehydrating agent inlet of the first shell, It is characterized by also including: A compressed air-dehydrating agent heat exchanger, whose primary side is arranged in the compressed air outlet pipeline, and whose secondary side is arranged in the dehydrating agent regeneration pipeline, the inlet of the secondary side of the compressed air-dehydrating agent heat exchanger is connected to the dehydrating agent outlet of the first shell, and the outlet of the secondary side of the compressed air-dehydrating agent heat exchanger is connected to the dehydrating agent inlet of the second shell.

2. The energy-saving water removal system according to claim 1, characterized in that: Also includes, A circulation pump is provided in the dehydrating agent circulation pipeline.

3. The energy-saving water removal system according to claim 2, characterized in that: Also includes, A humidity sensor is arranged in the compressed air outlet pipeline.

4. The energy-saving water removal system according to claim 3, characterized in that: The regeneration dehydrating agent flowing in the first shell and the second shell is at least one selected from ethylene glycol, lithium bromide, diethylene glycol, triethylene glycol, and tetraethylene glycol.

5. 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 4, and the compressed air inlet is connected to the outlet of the first-stage compressor.

6. The compressed air energy storage system according to claim 5, characterized in that: Also includes, The air storage reservoir is connected to the compressed air outlet pipeline of the energy-saving water removal system.

7. The compressed air energy storage system according to claim 5, characterized in that: Also includes, The energy storage heat exchanger is arranged between the first-stage compressor and the energy-saving water removal system.

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

9. The compressed air energy storage system according to claim 5, characterized in that: Also includes, The second muffler is arranged at the inlet of the first-stage compressor.

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