A purified compressed air energy storage power generation system

Abstract

The application discloses a purified compressed air energy storage power generation system and relates to the technical field of compressed air energy storage power generation. The purified compressed air energy storage power generation system comprises an energy releasing subsystem and a cold and heat storage subsystem. The energy releasing subsystem comprises a purification device and an expansion generator set. The purification device comprises a sprayer, a spraying tank, a rotary spraying absorber, an absorption tank and an absorption liquid heater. The cold and heat storage subsystem comprises a heat storage tank and a cold storage tank. The cold storage tank is used for storing low-temperature circulating medium, and the heat storage tank is used for storing high-temperature circulating medium. The application solves the technical problem of the large safety hidden danger of the compressed air power generation system in the prior art, has the advantages of removing the carried oil, solid dust, free water and dissolved chemical impurities in the compressed air, and can improve the service life, safety and stability of the compressed air energy storage power generation system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air energy storage power generation, and particularly relates to a compressed air energy storage power generation system with purification. BACKGROUND

[0002] The compressed air energy storage power generation technology is to store the electric energy in the low valley time by using the air compression energy storage technology (CAES) and release the electric energy when needed, so as to realize the power generation and grid connection, and belongs to the new energy power generation technology. When storing energy, the compressor set is needed to compress the air in nature into compressed air with high density and high pressure, and the compressed air is stored through the air storage system. When releasing energy, the stored compressed air is taken out to generate electricity through the expansion power generation system.

[0003] In the process of implementing the present application, the inventors have found that there are at least the following problems in the prior art:

[0004] The compressed air used when releasing energy contains various impurities. For example, the compressor set contains oil, and the compressed air prepared by the compressor set contains oil substances. These oil substances can be further divided into large oil droplets, small oil droplets and emulsified oil droplets. Acid radical ions, acidic or alkaline gases may be introduced into the compressed air storage device, and this phenomenon is particularly obvious in the case of underground air storage. In addition, one of the by-products of compressed air is free water, and the above-mentioned acidic or alkaline gases are easily dissolved in the free water in the form of ions. Solid particle impurities such as dust, rust and rock salt particles may also be introduced into the compressed air storage device.

[0005] The compressed air containing the above-mentioned impurities will cause serious safety hazards in subsequent use, mainly in two aspects: on the one hand, the impurities may affect the normal operation of the power generation system. The design life of the current large-scale compressed air energy storage power generation system is 30-50 years. In the case of compressed air containing impurities, it is necessary to frequently overhaul in order to achieve a service life of 30-50 years, especially to overhaul the complex and expensive expansion machine, pipelines and equipment at all levels. The overhaul process is complex and time-consuming. If frequent overhauls or replacements are made, it will inevitably cause the use cost of the compressed air energy storage power generation system to rise sharply, which leads to the fact that it has no market competitiveness compared with other new energy power generation systems. On the other hand, the device using compressed air is usually made of steel. Ordinary steel is prone to electrochemical corrosion under the condition of impurity-containing wet air. Since the use scenario of compressed air is usually a medium-high pressure working condition, corrosion may cause steel plate rupture and gas leakage, which are very serious consequences. And the slight chemical corrosion is also difficult to find in the overhaul. The compressed air purification system in the prior art has the technical problem of matching degree with the compressed air energy storage power generation system, which leads to the problem of system efficiency reduction.

[0006] Based on this, how to provide a compressed air energy storage power generation system with purification, which can remove oil, solid dust, free water and dissolved chemical impurities carried by compressed air at the same time, and is suitable for various types of impurities, and provides clean and dry compressed gas after purification, thereby improving the operation efficiency of the power generation system, is a technical problem to be solved by those skilled in the art. SUMMARY

[0007] The purpose of the present application is to provide a compressed air energy storage power generation system with purification, which can remove oil, solid dust, free water and dissolved chemical impurities carried by compressed air, thereby improving the service life, safety and stability of the compressed air energy storage power generation system.

[0008] To achieve this purpose, in one aspect, a compressed air energy storage power generation system with purification is provided, comprising an energy release subsystem and a cold and heat storage subsystem; the energy release subsystem comprises a purification device and an expansion generator set, the purification device comprises a sprayer, a spray tank, a rotary spray absorber, an absorption tank and an absorption liquid heater; impure compressed air enters from the sprayer, enters the rotary spray absorber after flowing out of the sprayer, and enters the expansion generator set after flowing out of the rotary spray absorber; the first liquid outlet of the spray tank is in communication with the liquid inlet of the sprayer, the second liquid outlet of the spray tank is in communication with the liquid inlet of the absorption tank through a first branch, and the liquid outlet of the absorption tank is in communication with the liquid inlet of the rotary spray absorber; a first valve is arranged on the first branch; the second liquid outlet of the spray tank is in communication with the liquid inlet of the rotary spray absorber through a second branch, and the first branch and the second branch jointly flow into the liquid inlet pipeline of the rotary spray absorber; a second valve is arranged on the second branch; the cold path of the absorption liquid heater is located on the liquid inlet pipeline of the rotary spray absorber; the cold and heat storage subsystem comprises a heat storage tank and a cold storage tank, the cold storage tank is used for storing low-temperature circulating medium, and the heat storage tank is used for storing high-temperature circulating medium; the hot path inlet of the absorption liquid heater is in communication with the outlet of the heat storage tank through a first subbranch; and the hot path outlet of the absorption liquid heater is in communication with the inlet of the cold storage tank.

[0009] Further, a first separator is arranged between the sprayer and the rotary spray absorber; compressed air flows out of the gas outlet of the sprayer into the gas inlet of the first separator, and then flows out of the gas outlet of the first separator into the gas inlet of the rotary spray absorber; and the first separator is used for drying compressed air.

[0010] Further, a plug flow trap is arranged in front of the inlet of the sprayer; compressed air to be purified enters the gas inlet of the plug flow trap, and then flows out of the gas outlet of the plug flow trap into the gas inlet of the sprayer.

[0011] Further, the spray tank is filled with water, and the absorption tank is filled with alkali or acid.

[0012] Further, the first separator is a cyclone separator or a vane separator.

[0013] Further, a first high-pressure pump is arranged on the pipeline between the first liquid outlet of the spray tank and the liquid inlet of the sprayer; a low-pressure pump is arranged on the first branch; a second high-pressure pump is arranged on the liquid inlet pipeline between the confluence point of the first branch and the second branch and the rotary-spray absorber.

[0014] Further, a PH detection device is arranged at the blowdown port of the rotary-spray absorber; a third valve is arranged on the liquid inlet pipeline of the rotary-spray absorber, and the outlet of the third valve is located before the inlet of the second high-pressure pump; the first valve and the third valve are controlled to be opened while the second valve is controlled to be closed by the PH detection device; or the second valve is controlled to be opened while the first valve and the third valve are controlled to be closed by the PH detection device; and / or the outlet pressure of the low-pressure pump and the second high-pressure pump is controlled by the PH detection device.

[0015] Further, the expansion generator set further comprises an expansion heat exchanger and at least one expansion unit; all the expansion units are connected in series; the cold inlet of the expansion heat exchanger is communicated with the gas outlet of the expansion unit, and the cold outlet of the expansion heat exchanger is communicated with the inlet of the next-stage expansion unit; the hot inlet of the expansion heat exchanger is communicated with the outlet of the heat storage tank through a second branch, and the hot outlet of the expansion heat exchanger is communicated with the inlet of the heat storage tank.

[0016] Further, the system further comprises a gas storage subsystem, which further comprises a gas storage tank, a compression heat recovery heat exchanger and at least one compressor unit; all the compressor units are connected in series; the external air source passes through all the compressor units and then enters the gas storage tank after passing through the hot pipeline of the compression heat recovery heat exchanger; the cold inlet of the compression heat recovery heat exchanger is communicated with the outlet of the heat storage tank, and the cold outlet of the compression heat recovery heat exchanger is communicated with the inlet of the heat storage tank.

[0017] One of the above technical solutions has the following beneficial effects:

[0018] The compressed air energy storage power generation system with purification comprises an energy releasing subsystem and a heat storage and heat accumulation subsystem; the energy releasing subsystem generates power by using compressed air, and the heat storage and heat accumulation subsystem provides heat and cold for the compressed air energy storage power generation system with purification and recovers heat and cold of the system.

[0019] The energy releasing subsystem comprises a purification device, the purification device comprising a sprayer, a spray tank, a rotary-spray absorber, an absorption tank and an absorption liquid heater; a first liquid outlet of the spray tank is in communication with a liquid inlet of the sprayer, a second liquid outlet of the spray tank is in communication with a liquid inlet of the absorption tank through a first branch, a liquid outlet of the absorption tank is in communication with a liquid inlet of the rotary-spray absorber; a first valve is arranged on the first branch; the second liquid outlet of the spray tank is in communication with the liquid inlet of the rotary-spray absorber through a second branch, the first branch and the second branch jointly flow into a liquid inlet pipeline of the rotary-spray absorber; a second valve is arranged on the second branch.

[0020] The spray tank is used for storing the spray liquid provided to the sprayer, and the compressed air containing impurities enters from the air inlet of the sprayer and flows out from the air outlet of the sprayer. The compressed air passing through the sprayer can remove oil droplets and dust in the impurities and reduce the concentration of total dissolved solids of free water carried in the compressed air.

[0021] The absorption tank is used for storing the absorption liquid provided to the rotary-spray absorber, and the compressed air containing impurities flows out from the air outlet of the sprayer and enters the air inlet of the rotary-spray absorber. The compressed air flowing out from the air outlet of the sprayer enters the rotary-spray absorber tangentially, and a rotational flow field can be formed in the rotary-spray absorber. After the compressed air to be purified enters the air inlet, it is subjected to centrifugal force, and at the same time, the working fluid is sprayed from the side along the radial direction and is cut and atomized by the impact of the compressed air to be purified, forming countless working fluid droplets for absorption. The working fluid droplets and the free water containing chemical impurities in the compressed air to be purified perform an absorption reaction. Since a rotational flow field can be formed in the rotary-spray absorber, the purified compressed air is dry compressed air, which is discharged from the central exhaust pipe of the rotary-spray absorber, and the absorption liquid droplets after the reaction are discharged from the blowdown port of the rotary-spray absorber. Therefore, the rotary-spray absorber can remove free water and acid-base ions in the compressed air, and the purified compressed air flows out from the air outlet of the rotary-spray absorber and enters the expansion generator set to generate electricity. Since the compressed air from the gas storage system is first deoiled, solid, free water and chemical impurities by the above-mentioned purification device before entering the expansion generator set, the compressed air flowing into the expansion generator set is clean and dry, thereby improving the efficiency, service life, safety and stability of the system.

[0022] The second liquid outlet of the spray tank is communicated with the liquid inlet of the absorption tank through a first branch, and the liquid outlet of the absorption tank is communicated with the liquid inlet of the rotary spray absorber; a first valve is arranged on the first branch, and the first valve is used to control the opening degree of the first branch. The second liquid outlet of the spray tank is communicated with the liquid inlet of the rotary spray absorber through a second branch, and the first branch and the second branch jointly flow into the liquid inlet pipeline of the rotary spray absorber; a second valve is arranged on the second branch, and the second valve is used to control the opening degree of the second branch. When the first valve is opened, the spray tank is communicated with the absorption tank, and the working medium in the spray tank enters the absorption tank, so that the composition of the working medium in the absorption tank can be adjusted, and thus the composition of the absorption liquid entering the rotary spray absorber can be adjusted. When the second valve is opened, the spray tank is directly connected with the rotary spray absorber, and the working medium in the spray tank enters the rotary spray absorber. The above technical scheme can select whether the working medium in the spray tank enters the rotary spray absorber or the mixed working medium in the spray tank and the absorption tank enters the rotary spray absorber through the impurity composition of the uncleaned compressed air flowing out of the gas storage system, and the concentration ratio of the above mixed working medium can also be adjusted by adjusting the opening degree of the first valve.

[0023] In order to improve the absorption efficiency of the rotary spray absorber, an absorption liquid heater is arranged on the liquid inlet pipeline of the rotary spray absorber. The cold storage and heat storage subsystem includes a cold storage tank and a heat storage tank, the cold storage tank is used to store low-temperature circulating medium, and the heat storage tank is used to store high-temperature circulating medium. The heat inlet of the absorption liquid heater is communicated with the heat storage tank, and the heat storage tank provides heat for the absorption liquid heater. The heat outlet of the absorption liquid heater is communicated with the inlet of the cold storage tank, and the high-temperature circulating medium after being cooled becomes low-temperature circulating medium and is stored in the cold storage tank.

[0024] Therefore, the compressed air energy storage power generation system can purify the compressed air flowing out of the gas storage system through the purification device before the compressed air enters the expansion generator set, so that the oil, solid dust, free water and chemical impurities dissolved in the oil, solid dust and free water carried by the compressed air can be removed, and the service life, safety and stability of the compressed air energy storage power generation system can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a flowchart of example one.

[0026] In the figure: 110 - compressor unit; 120 - gas storage; 121 - gas storage inlet valve; 122 - gas storage outlet valve; 130 - compressed heat recovery heat exchanger; 211 - sprayer; 212 - spray tank; 213 - rotary spray absorber; 214 - absorption tank; 215 - absorption liquid heater; 216 - first valve; 217 - second valve; 218 - third valve; 219 - first separator; 220 - slug catcher; 221 - first high pressure pump; 222 - low pressure pump; 223 - second high pressure pump; 224 - PH detection device; 232 - expansion generator unit; 231 - expansion heat exchanger; 310 - heat storage tank; 320 - cold storage tank; 311 - first hot water pump; 312 - first heat storage tank outlet valve; 313 - first cold storage tank inlet valve; 314 - second hot water pump; 315 - second heat storage tank outlet valve; 316 - second cold storage tank inlet valve; 317 - cold storage tank outlet valve; 318 - cold water pump; 319 - heat storage tank inlet valve. DETAILED DESCRIPTION

[0027] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless explicitly defined and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0030] Embodiment one:

[0031] As Figure 1 The embodiment provides a compressed air energy storage power generation system with purification, which comprises a gas storage subsystem, an energy release subsystem and a cold and heat storage subsystem. The gas storage subsystem is used for absorbing and compressing air in nature into effective resources with high density and high pressure and storing the resources. The cold and heat storage subsystem is used for providing a cold source or a heat source for the system. The energy release subsystem is used for converting the effective resources with high density and high pressure into electric energy.

[0032] The energy release subsystem comprises a purification device, the purification device comprises a sprayer 211, a spraying tank 212, a rotary spraying absorber 213, an absorption tank 214 and an absorption liquid heater 215; a first liquid outlet of the spraying tank 212 is in communication with a liquid inlet of the sprayer 211, a second liquid outlet of the spraying tank 212 is in communication with a liquid inlet of the absorption tank 214 through a first branch, and a liquid outlet of the absorption tank 214 is in communication with a liquid inlet of the rotary spraying absorber 213; a first valve 216 is arranged on the first branch; the second liquid outlet of the spraying tank 212 is in communication with the liquid inlet of the rotary spraying absorber 213 through a second branch, and the first branch and the second branch jointly flow into a liquid inlet pipeline of the rotary spraying absorber 213; and a second valve 217 is arranged on the second branch.

[0033] The spraying tank 212 is used for storing spraying liquid provided for the sprayer 211, and compressed air containing impurities enters from a gas inlet of the sprayer 211 and flows out from a gas outlet of the sprayer 211. The compressed air passing through the sprayer 211 can remove oil droplets and dust in the impurities and reduce the concentration of total dissolved solids of free water carried in the compressed air.

[0034] The absorption tank 214 is used to store the absorption liquid provided to the rotary spray absorber 213, and the compressed air containing impurities flows out of the air outlet of the sprayer 211 and enters the air inlet of the rotary spray absorber 213. The compressed air flowing out of the air outlet of the sprayer 211 enters the rotary spray absorber 213, and the inside of the rotary spray absorber 213 can form a rotational flow field. The compressed air to be purified enters from the air inlet and is subjected to centrifugal force, while the working fluid is sprayed radially from the side, is impacted and cut by the compressed air to be purified, and forms countless working fluid droplets for absorption. The working fluid droplets and the free water containing chemical impurities in the compressed air to be purified undergo an absorption reaction. Because the inside of the rotary spray absorber 213 can form a rotational flow field, the purified compressed air is dry compressed air, which is discharged from the central exhaust pipe of the rotary spray absorber 213, and the absorption liquid droplets after the reaction are discharged from the blowdown port of the rotary spray absorber 213. Therefore, the rotary spray absorber can remove free water and acid-base ions from the compressed air, and the compressed air flowing out of the air outlet of the rotary spray absorber 213 is purified compressed air, which enters the expansion generator set 232 to generate electricity. Because the compressed air from the gas storage system is first deoiled, solid dust, free water and chemical impurities by the above-mentioned purification device before entering the expansion generator set 232, the compressed air flowing into the expansion generator set 232 is clean and dry compressed air, thereby improving the efficiency, service life, safety and stability of the system.

[0035] The second liquid outlet of the spray tank 212 is communicated with the liquid inlet of the absorption tank 214 through a first branch, and the liquid outlet of the absorption tank 214 is communicated with the liquid inlet of the rotary spray absorber 213; the first valve 216 is arranged on the first branch, and the first valve 216 is used for controlling the opening degree of the first branch. The second liquid outlet of the spray tank 212 is communicated with the liquid inlet of the rotary spray absorber 213 through a second branch, and the first branch and the second branch are jointly introduced into the liquid inlet pipeline of the rotary spray absorber 213; the second valve 217 is arranged on the second branch, and the second valve 217 is used for controlling the opening degree of the second branch. When the first valve 216 is opened, the spray tank 212 is communicated with the absorption tank 214, and the working medium in the spray tank 212 enters the absorption tank 214, so that the composition of the working medium in the absorption tank 214 can be adjusted, and thus the composition of the absorption liquid entering the rotary spray absorber 213 can be adjusted. When the second valve 217 is opened, the spray tank 212 is directly connected with the rotary spray absorber 213, and the working medium in the spray tank 212 enters the rotary spray absorber 213. The compressed air to be purified may contain both acid ions and alkali, and both are easily dissolved in free water. The solution after being dissolved in free water is either acidic or alkaline as a whole, and in a few cases, it may be neutral. The chemical properties of the compressed air to be purified can be determined before it enters the purification device. In this embodiment, the impurity composition of the un-purified compressed air flowing out of the gas storage system can be used to select whether to use the working medium in the spray tank 212 to enter the rotary spray absorber 213 or to use the mixed working medium in the spray tank 212 and the absorption tank 214 to enter the rotary spray absorber 213, and the concentration ratio of the above-mentioned mixed working medium can also be adjusted by adjusting the valve opening degree of the first valve 216.

[0036] In order to improve the absorption efficiency of the rotary spray absorber 213, an absorption liquid heater 215 is arranged on the liquid inlet pipeline of the rotary spray absorber 213. The cold storage and heat storage subsystem includes a heat storage tank 310, and the hot inlet of the absorption liquid heater 215 is communicated with the heat storage tank 310. The heat storage tank is used for storing high-temperature circulating medium, and the high-temperature circulating medium refers to circulating medium with high temperature. The heat storage tank 310 provides heat for the absorption liquid heater 215. The cold storage and heat storage subsystem also includes a cold storage tank 320, and the cold storage tank is used for storing low-temperature circulating medium. The hot outlet of the absorption liquid heater 215 is communicated with the inlet of the cold storage tank 320. The high-temperature circulating medium after being cooled becomes low-temperature circulating medium and is stored in the cold storage tank. The circulating medium in this embodiment can use the circulating medium of a commonly used heat exchanger, such as water or antifreeze.

[0037] Therefore, the compressed air containing purified energy storage power generation system in this embodiment can purify the compressed air flowing out of the gas storage system through the purification device before entering the expansion generator set 232, so that the oil, solid dust, free water and chemical impurities dissolved therein carried by the compressed air can be removed, thereby improving the service life, safety and stability of the compressed air energy storage power generation system.

[0038] Further, the spray tank 212 is filled with water, and the absorption tank 214 is filled with alkali or acid. Preferably, the spray tank 212 is filled with one of desalted water, pure water, and distilled water. The spray tank 212 and the absorption tank 214 are connected by a first branch, and the first branch is provided with a first valve 216. The concentration of the acid solution or alkali solution in the absorption tank 214 can be adjusted by adjusting the opening of the first valve 216.

[0039] Further, a first separator 219 is arranged between the sprayer 211 and the rotary-spray absorber 213. The compressed air from the outlet of the sprayer 211 enters the inlet of the first separator 219, and then enters the inlet of the rotary-spray absorber 213 from the outlet of the first separator 219. The first separator 219 is used to dry the compressed air.

[0040] The compressed air after spraying can introduce excess spray liquid. Next, the liquid droplets and solid impurities carried by the compressed air are separated by the first separator 219, and the amount of total dissolved solids in the liquid carried by the compressed air is further reduced. If the working medium in the spray tank 212 is water, the compressed air after spraying can introduce free water, and then the free water in the compressed air is further separated by the separator, and the amount of total dissolved solids in the liquid carried by the compressed air is further reduced.

[0041] Further, a plug flow trap 220 is arranged before the inlet of the sprayer 211. The compressed air to be purified from the gas storage 120 enters the inlet of the plug flow trap 220, and then enters the inlet of the sprayer 211 from the outlet of the plug flow trap 220. When the raw gas passes through the undulating pipeline, the free water carried by the raw gas will accumulate at the bottom of the pipeline. When the volume reaches a certain value, plug flow will occur in the pipeline. Therefore, the raw gas is first introduced into the plug flow trap 220 to receive the plug flow that may occur before the purified compressed air enters the purification system, and separate the plug flow carried by the raw gas. The plug flow trap 220 functions to eliminate plug flow, provide stable transportation for the downstream, and also preliminarily separate a part of large particles of oil in the raw gas. Further, the plug flow trap 220 can be a container type or a pipeline type, which is selected according to the site conditions.

[0042] Further, the first separator 219 is a cyclone separator or a vane separator; and / or, the first separator 219 is a cyclone separator or a vane separator, which is selected according to the working condition. If the operating condition of the compressed air is stable, such as stable flow rate and pressure, a cyclone separator is used. If the elastic range of the operating condition of the compressed air is large, a vane separator is used.

[0043] Further, a first high-pressure pump 221 is arranged on the pipeline between the first liquid outlet of the spray tank 212 and the liquid inlet of the sprayer 211. Since the compressed air to be sprayed in the sprayer is of medium-high pressure, a high-pressure pump is used to introduce the spray working medium into the sprayer. The amount of working medium from the spray tank 212 into the sprayer 211 is adjusted by adjusting the outlet pressure of the first high-pressure pump 221. A low-pressure pump 222 is arranged on the first branch between the second liquid outlet of the spray tank 212 and the liquid inlet of the absorption tank 214. The amount of working medium from the spray tank 212 into the absorption tank 214 is adjusted by opening the first valve 216 and adjusting the outlet pressure of the low-pressure pump 222, so as to adjust the acid / base concentration of the working medium in the absorption tank 214, and further adjust the acid / base concentration of the working medium into the rotary-spray absorber 213. A second high-pressure pump 223 is arranged on the liquid inlet pipeline between the confluence point of the first branch and the second branch and the rotary-spray absorber 213. Since the compressed air to be absorbed in the rotary-spray absorber is of medium-high pressure, a high-pressure pump is used to introduce the absorption working medium into the rotary-spray absorber. The purification effect of the rotary-spray absorber 213 is controlled by adjusting the concentration of the alkali working medium in the absorption tank 214 and the outlet pressure of the second high-pressure pump 223.

[0044] Further, a PH detection device 224 is arranged at the blowdown port of the rotary-spray absorber 213, for detecting the PH value of the sewage discharged from the rotary-spray absorber 213, and controlling the opening degree of the following valves and the outlet pressure of the pumps according to the PH value. A third valve 218 is arranged on the liquid inlet pipeline of the rotary-spray absorber 213, and the outlet of the third valve 218 is located before the inlet of the second high-pressure pump 223. If the PH detection device 224 detects that the PH of the blowdown port of the rotary-spray absorber 213 is neutral, the PH detection device 224 controls the second valve 217 to open, and the first valve 216 and the third valve 218 to close at the same time. At this time, the spray liquid enters the rotary-spray absorber 213, i.e. the working medium into the sprayer 211 and the rotary-spray absorber 213 both comes from the spray tank 212. If the PH detection device 224 detects that the PH of the blowdown port of the rotary-spray absorber 213 is acidic or alkaline, the PH detection device 224 controls the first valve 216 and the third valve 218 to open, and the second valve 217 to close at the same time, so as to adjust the component concentration of the working medium in the absorption tank 214. The outlet pressure of the low-pressure pump 222 and the second high-pressure pump 223 can also be controlled by the PH detection device 224. The outlet pressure of the low-pressure pump 222 and the second high-pressure pump 223 is adjusted according to the acidity / alkalinity detected by the PH detection device 224, so as to adjust the acid / base concentration of the working medium in the absorption tank 214.

[0045] Further, the expansion generator set 232 further comprises an expansion heat exchanger 231 and at least one stage of expansion machines, all of which are connected in series. The cold inlet of the expansion heat exchanger 231 is connected to the gas outlet of the expansion machine, and the cold outlet of the expansion heat exchanger 231 is connected to the inlet of the next stage of expansion machine; the hot inlet of the expansion heat exchanger 231 is connected to the second outlet of the heat storage tank 310, and the hot outlet of the expansion heat exchanger 231 is connected to the inlet of the cold storage tank 320. The expansion heat exchanger 231 is used to recover the cold energy of expansion.

[0046] Further, the air storage subsystem further comprises an air storage tank 120, a compression heat recovery heat exchanger 130, and at least one stage of compressor sets 110, all of which are connected in series. The outside air source enters the air storage tank 120 through the compression heat recovery heat exchanger 130 after being compressed, and the cold inlet of the compression heat recovery heat exchanger 130 is connected to the outlet of the cold storage tank 320, and the cold outlet of the compression heat recovery heat exchanger 130 is connected to the inlet of the heat storage tank 310. The compression heat recovery heat exchanger 130 is used to recover the heat energy generated by the compressor set 110.

[0047] Further, in the air storage subsystem, there is an air storage tank inlet valve 121 on the pipeline from the compressor set to the air storage tank; and in the expansion subsystem, there is an air storage tank outlet valve 122 on the pipeline from the air storage tank.

[0048] Further, the heat storage tank 310 simultaneously provides heat sources for the absorption liquid heater 215 and the expansion heat exchanger 231, and the heat storage tank 310 is connected to the heat path of the absorption liquid heater 215 through a first branch and enters the cold storage tank 320, and the first branch is provided with a first hot water pump 311, a first heat storage tank outlet valve 312, and a first cold storage tank inlet valve 313. The heat storage tank 310 is connected to the heat path of the expansion heat exchanger 231 through a second branch and enters the cold storage tank 320, and the second branch is provided with a second hot water pump 314, a second heat storage tank outlet valve 315, and a second cold storage tank inlet valve 316. The cold inlet of the compression heat recovery heat exchanger 130 is connected to the cold storage tank 320 through a cold water pump 318 and a cold storage tank outlet valve 317, and the cold outlet of the compression heat recovery heat exchanger 130 is connected to the heat storage tank 310 through a heat storage tank inlet valve 319.

[0049] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. It is not necessary or possible to exhaust all the embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A purified compressed air energy storage power generation system comprising, The energy releasing subsystem and the cold and heat storage subsystem; The energy releasing subsystem comprises a purification device and an expansion generator set, the purification device comprises a sprayer, a spraying tank, a rotary spraying absorber, an absorption tank and an absorption liquid heater; the compressed air containing impurities enters the sprayer, flows out of the sprayer and enters the rotary spraying absorber, and then flows out of the rotary spraying absorber and enters the expansion generator set; the first liquid outlet of the spraying tank is communicated with the liquid inlet of the sprayer, the second liquid outlet of the spraying tank is communicated with the liquid inlet of the absorption tank through a first branch, and the liquid outlet of the absorption tank is communicated with the liquid inlet of the rotary spraying absorber; a first valve is arranged on the first branch; the second liquid outlet of the spraying tank is communicated with the liquid inlet of the rotary spraying absorber through a second branch, and the first branch and the second branch jointly enter the liquid inlet pipeline of the rotary spraying absorber; a second valve is arranged on the second branch; the cold path of the absorption liquid heater is located on the liquid inlet pipeline of the rotary spraying absorber; The cold and heat storage subsystem comprises a heat storage tank and a cold storage tank, the cold storage tank is used for storing low-temperature circulating medium, and the heat storage tank is used for storing high-temperature circulating medium; the hot path inlet of the absorption liquid heater is communicated with the outlet of the heat storage tank through a first branch; the hot path outlet of the absorption liquid heater is communicated with the inlet of the cold storage tank; A first separator is further arranged between the sprayer and the rotary spraying absorber; The compressed air flows out of the gas outlet of the sprayer, enters the gas inlet of the first separator, and then flows out of the gas outlet of the first separator and enters the gas inlet of the rotary spraying absorber; The first separator is used for drying the compressed air; A first high-pressure pump is arranged on the pipeline between the first liquid outlet of the spraying tank and the liquid inlet of the sprayer; a low-pressure pump is arranged on the first branch; a second high-pressure pump is arranged on the liquid inlet pipeline between the joint of the first branch and the second branch and the rotary spraying absorber; A PH detection device is arranged at the blowdown port of the rotary spraying absorber; a third valve is arranged on the liquid inlet pipeline of the rotary spraying absorber, and the outlet of the third valve is located before the inlet of the second high-pressure pump; The first valve and the third valve are controlled to be opened and the second valve is controlled to be closed by the PH detection device; or the second valve is controlled to be opened and the first valve and the third valve are controlled to be closed by the PH detection device; And / or, the outlet pressure of the low-pressure pump and the second high-pressure pump is controlled by the PH detection device.

2. The purified compressed air energy storage for power generation system of claim 1, wherein, A plug flow trap is further arranged in front of the inlet of the sprayer; The compressed air to be purified enters the gas inlet of the plug flow trap, and then flows out of the gas outlet of the plug flow trap and enters the gas inlet of the sprayer.

3. The purified compressed air energy storage for power generation system of claim 1, wherein, Water is filled in the spraying tank, and alkali or acid is filled in the absorption tank.

4. The purified compressed air energy storage for power generation system of claim 1, wherein, The first separator is a cyclone separator or a vane separator.

5. The purified compressed air energy storage for power generation system of claim 1, wherein, The expansion generator set further comprises an expansion heat exchanger and at least one expansion set; all the expansion sets are connected in series; The cold path inlet of the expansion heat exchanger is communicated with the gas outlet of the expansion set, and the cold path outlet of the expansion heat exchanger is communicated with the inlet of the next expansion set. The hot path import of the expansion heat exchanger is communicated with the export of the heat storage tank through a second branch; the hot path export of the expansion heat exchanger is communicated with the import of the cold storage tank.

6. The purified compressed air energy storage for power generation system of claim 1, wherein, Further comprising a gas storage subsystem, the gas storage subsystem further comprising a gas storage, a compression heat recovery heat exchanger and at least one compressor set; all the compressor sets are connected in series; The external air source enters the gas storage after passing through all the compressor sets and then passing through the hot path of the compression heat recovery heat exchanger; the cold path import of the compression heat recovery heat exchanger is communicated with the export of the cold storage tank, and the cold path export of the compression heat recovery heat exchanger is communicated with the import of the heat storage tank.

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