Compressed-air purification system

Abstract

The present application relates to the technical field of compressed-air purification. Disclosed is a compressed-air purification system. The compressed-air purification system of the present application comprises a spray device and a rotary spray absorption device, wherein the spray device comprises a sprayer and a first working-medium tank; the rotary spray absorption device comprises a rotary spray absorber and a second working-medium tank; a liquid inlet of the sprayer is in communication with a first liquid outlet of the first working-medium tank by means of a pipeline; a second liquid outlet of the first working-medium tank is in communication with a liquid inlet of the second working-medium tank; and a liquid outlet of the second working-medium tank is in communication with a liquid inlet of the rotary spray absorber. The compressed-air purification system of the present application overcomes the limitations in the prior art regarding compressed-air purification systems in terms of applicable working conditions and solves the technical problem of low controllability in the purification process. The compressed-air purification system can be widely applied in the compressed-air energy storage industry in fields such as petroleum, chemicals, metallurgy, electric power, machinery, light industry, textiles, automobile manufacturing, electronics, food products, medicine, biochemistry, national defense, and electric power energy storage.

Description

A compressed air purification system

[0001] Related Technology Cross-references

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on March 20, 2024, with application number 202410319886.X and invention name “A Compressed Air Purification System”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of compressed air purification, and in particular to a compressed air purification system. Background Art

[0004] Compressed air is air that has been compressed by an external force. Air is compressible, and the air that has been compressed by the mechanical work of an air compressor, resulting in a reduction in volume and an increase in pressure, is called compressed air. Compressed air is an important power source. Compared to other energy sources, it possesses distinct advantages: clarity, ease of transport, no harmful properties, no fire hazard, no overload resistance, and the ability to operate in many adverse environments. Air is ubiquitous and inexhaustible. Compressed air is a versatile process air source, with applications in various industries and sectors, including petroleum, chemical, metallurgy, electricity, machinery, light industry, textiles, automotive, electronics, food, medicine, biochemistry, national defense, and scientific research. In most cases, compressed air requires purification before use.

[0005] In the process of implementing this application, the inventors discovered that the prior art has at least the following problems:

[0006] Compressed air production and storage methods vary, leading to variations in the impurities present in the compressed air. For example, the reciprocating compressors used in compressed air production contain oil, and the resulting compressed air contains oily substances, which can be further subdivided into large oil droplets, small oil droplets, and emulsified oil droplets. Acid ions and acidic or alkaline gases may be introduced into compressed air storage devices, a phenomenon particularly pronounced in underground gas storage. Furthermore, one byproduct of compressed air is free water, and these acidic or alkaline gases are highly soluble in free water, existing as ions. Compressed air storage devices may also contain solid particulate impurities such as dust, silt, rust, and rock salt particles. Compressed air containing these impurities can pose serious safety hazards during subsequent use, primarily in two ways. First, if the compressed air is passed into a process unit, the impurities may affect the normal operation of the main process unit. On the other hand, the devices that use compressed air at the user end are typically made of steel. Ordinary steel is highly susceptible to electrochemical corrosion in the presence of humid air. Since compressed air is typically used in medium- and high-pressure environments, corrosion can lead to serious consequences such as steel plate fractures and gas leaks. Existing compressed air purification systems suffer from technical issues such as a limited number of impurities that can be purified, limited operating conditions, and low controllability of the purification process.

[0007] Based on this, how to provide a compressed air purification system that can simultaneously remove oil, solid dust, free water and chemical impurities dissolved in compressed air, and adapt to various types of impurities, and produce clean dry compressed gas after purification, which is convenient for subsequent application in various occasions, is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the Invention

[0008] The purpose of this application is to provide a compressed air purification system that can simultaneously remove oil, solid dust, free water and chemical impurities dissolved in the free water carried by the compressed air.

[0009] To achieve this purpose, on the one hand, a compressed air purification system is provided, including a spray device and a rotary spray absorption device, the spray device including a sprayer and a first working fluid tank, the rotary spray absorption device including a rotary spray absorber and a second working fluid tank; the liquid inlet of the sprayer is connected to the first liquid outlet of the first working fluid tank through a pipeline, the second liquid outlet of the first working fluid tank is connected to the liquid inlet of the second working fluid tank, and the liquid outlet of the second working fluid tank is connected to the liquid inlet of the rotary spray absorber through a pipeline; the second liquid outlet of the first working fluid tank is also connected to the liquid inlet of the rotary spray absorber through a pipeline via a first bypass branch; a first valve is provided on the pipeline between the second liquid outlet of the first working fluid tank and the liquid inlet of the second working fluid tank; a second valve is provided on the first bypass branch; the compressed air to be purified enters the air inlet of the sprayer, flows out from the air outlet of the sprayer and enters the air inlet of the rotary spray absorber.

[0010] Optionally, a first separator is further provided between the sprayer and the rotary spray absorber; the compressed air flows out from the air outlet of the sprayer and enters the air inlet of the first separator, and then flows out from the air outlet of the first separator and enters the air inlet of the rotary spray absorber; the first separator is used to dry the compressed air.

[0011] Optionally, an oil remover is further provided between the first separator and the rotary jet absorber; the air outlet of the first separator is connected to the air inlet of the oil remover through a first branch, and the air outlet of the oil remover is connected to the air inlet of the rotary jet absorber; a third valve is provided on the first branch; and a fifth valve is provided at the air outlet of the oil remover.

[0012] Optionally, the air outlet of the first separator also includes a second branch, one end of the second branch is connected to the air outlet of the first separator, and the other end of the second branch is connected to the outlet pipe of the fifth valve, and the compressed air flowing out of the second branch enters the air inlet of the rotary jet absorber; a fourth valve is provided on the second branch.

[0013] Optionally, a slug flow catcher is further provided before the inlet of the sprayer; the compressed air to be purified enters the air inlet of the slug flow catcher, flows out from the air outlet of the slug flow catcher and then enters the air inlet of the sprayer.

[0014] Optionally, a second separator is further provided on the outlet side of the rotary jet absorber, and the compressed air flowing out of the air outlet of the rotary jet absorber enters the air inlet of the second separator and flows out from the air outlet of the second separator.

[0015] Optionally, the first working fluid tank is filled with water, alkali or acid, and the second working fluid tank is filled with alkali or acid.

[0016] Optionally, a sixth valve is provided at the outlet of the second working fluid tank; the first working fluid tank is filled with water, the second working fluid tank is filled with alkali, the first valve and the sixth valve are opened, and the second valve is closed, for purifying the compressed air.

[0017] Optionally, a sixth valve is provided at the outlet of the second working fluid tank; the first working fluid tank is filled with water, the second working fluid tank is filled with acid, the first valve and the sixth valve are opened, and the second valve is closed, for purifying the compressed air.

[0018] Optionally, a sixth valve is provided at the outlet of the second working fluid tank; the first working fluid tank is filled with water, the first valve and the sixth valve are closed, and the second valve is opened to purify the compressed air.

[0019] Optionally, the first separator is a cyclone separator or a blade separator; and / or the second separator is a cyclone separator or a blade separator.

[0020] Optionally, a first cooler is provided between the first liquid outlet of the first working medium tank and the liquid inlet of the sprayer; and / or a second cooler is provided on the pipeline at the liquid inlet of the rotary spray absorber.

[0021] Optionally, a first high-pressure pump is further provided on the pipeline between the first liquid outlet of the first working fluid tank and the liquid inlet of the sprayer; and / or, a second high-pressure pump is provided at the liquid inlet of the rotary spray absorber, the outlet of the second high-pressure pump is connected to the liquid inlet of the rotary spray absorber, a sixth valve is provided at the liquid outlet pipeline of the second working fluid tank, the inlet of the sixth valve is connected to the liquid outlet of the second working fluid tank, the outlet of the sixth valve is connected to the outlet of the second valve, and the outlet of the sixth valve and the outlet of the second valve are both connected to the inlet of the second high-pressure pump; and / or, a low-pressure pump is further provided on the pipeline between the second liquid outlet of the first working fluid tank and the liquid inlet of the second working fluid tank.

[0022] Optionally, a pH detection device is provided at the sewage outlet of the rotary jet absorber; the first valve and the sixth valve are controlled to be opened, and the second valve is closed by the pH detection device; or the second valve is controlled to be opened, and the first valve and the sixth valve are 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.

[0023] Optionally, the deoiler is an oil removal coalescer.

[0024] Optionally, a first three-phase separator is further provided before the inlet of the sprayer; the compressed air to be purified enters the air inlet of the first three-phase separator, flows out from the air outlet of the first three-phase separator and then enters the air inlet of the sprayer.

[0025] Optionally, the first three-phase separator includes a weir plate, a liquid collection area, and an ice collection area; the bottom of the weir plate is connected to the inner bottom wall of the first three-phase separator, and there is a gas phase space between the top of the weir plate and the inner top wall of the first three-phase separator; the windward side of the weir plate is the side facing the air inlet of the first three-phase separator, and the leeward side of the weir plate is the back of the windward side of the weir plate; the liquid collection area is located in the space below the windward side of the weir plate; the ice collection area is located in the space below the leeward side of the weir plate; the ice collection area has a heater, which is used to heat the ice collection area; the first sewage outlet of the first three-phase separator is located at the bottom of the liquid collection area, and the second sewage outlet of the first three-phase separator is located at the bottom of the ice collection area.

[0026] Optionally, a second three-phase separator is provided before the inlet of the sprayer, and the second three-phase separator is connected in parallel with the first three-phase separator; the compressed air to be purified enters the air inlet of the first three-phase separator, flows out from the air outlet of the first three-phase separator, and then enters the air inlet of the sprayer; or, the compressed air to be purified enters the air inlet of the second three-phase separator, flows out from the air outlet of the second three-phase separator, and then enters the air inlet of the sprayer.

[0027] One of the above technical solutions has the following advantages or beneficial effects:

[0028] The compressed air purification system includes a spray device and a rotary spray absorption device, wherein the spray device includes a sprayer and a first working fluid tank, the first working fluid tank is used to store the working fluid required by the sprayer, and the rotary spray absorption device includes a rotary spray absorber and a second working fluid tank, the second working fluid tank is used to store the working fluid required by the rotary spray absorber. The liquid inlet of the sprayer is connected to the first liquid outlet of the first working fluid tank through a pipeline, the second liquid outlet of the first working fluid tank is connected to the liquid inlet of the second working fluid tank, and the liquid outlet of the second working fluid tank is connected to the liquid inlet of the rotary spray absorber. On the one hand, the first working fluid tank is connected to the liquid inlet of the sprayer to provide the sprayer with the working fluid required for spraying, and on the other hand, it is connected to the liquid inlet of the second working fluid tank to adjust the component concentration of the working fluid in the second working fluid tank. The liquid outlet of the second working fluid tank is connected to the liquid inlet of the rotary spray absorber to provide the rotary spray absorber with the required working fluid. Therefore, the working fluid in the first working fluid tank can further adjust the component concentration of the working fluid required by the rotary spray absorber. There is a first valve on the pipeline between the second liquid outlet of the first working fluid tank and the liquid inlet of the second working fluid tank. By adjusting the opening of the first valve, the amount of working fluid entering the second working fluid tank from the first working fluid tank is adjusted, thereby adjusting the component concentration of the working fluid in the second working fluid tank, and then adjusting the component concentration of the working fluid entering the rotary spray absorber.

[0029] The second liquid outlet of the first working fluid tank is also connected to the liquid inlet of the rotary spray absorber through the first bypass branch. The rotary spray absorber can directly use the working fluid in the first working fluid tank through the first bypass branch. There is a second valve on the first bypass branch. By adjusting the opening of the second valve, the amount of working fluid from the first working fluid tank entering the rotary spray absorber can be adjusted.

[0030] The compressed air to be purified first enters the sprayer. Under the action of the working fluid in the first working fluid tank, the compressed air is sprayed to remove large oil droplets and dust, and reduce the concentration of total dissolved solids in the free water carried in the compressed air. The compressed air flowing out of the air outlet of the sprayer enters the rotary spray absorber from the side. A cyclone field can be formed inside the rotary spray absorber. After the compressed air to be purified enters from the air inlet, it is subjected to centrifugal force. At the same time, the working fluid is sprayed radially from the side and is atomized by the impact of the compressed air to be purified, forming countless working fluid droplets for absorption. The working fluid droplets react with the free water containing chemical impurities in the compressed air to be purified by absorption. Since a cyclone field can be formed inside the rotary spray absorber, the purified compressed air is dry compressed air and is discharged from the air outlet of the rotary spray absorber. The air outlet of the rotary spray absorber is located at the center of the top of the rotary spray absorber, and the absorbed droplets after reaction are discharged from the sewage outlet at the bottom of the rotary spray absorber.

[0031] Whether to open the first or second valve is determined based on the chemical impurities dissolved in the free water in the compressed air to be purified. If the working fluid in the first working fluid tank can be used to absorb impurities in the compressed air entering the rotary jet absorber, the second valve is opened and the first valve is closed. If a mixed working fluid from the first and second working fluid tanks is required to absorb impurities in the compressed air entering the rotary jet absorber, the first valve is opened and the second valve is closed.

[0032] Based on this, the compressed air purification system can simultaneously remove oil, solid dust, free water, and dissolved chemical impurities from compressed air. It can also adapt the required impurity removal fluid to the composition of these chemical impurities, offering the advantages of a wide purification range and high controllability. Compressed air purified by the compressed air purification system is a high-quality, clean, dry compressed gas, making it suitable for subsequent applications in a variety of situations. It can be widely used in the compressed air energy storage industry in the petroleum, chemical, metallurgy, electric power, machinery, light industry, textiles, automotive manufacturing, electronics, food, medicine, biochemistry, national defense, and power energy storage sectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic diagram of a process flow of Example 1 of the present application;

[0034] FIG2 is a schematic diagram of a flow chart of Example 2 of the present application;

[0035] FIG3 is a schematic structural diagram of the first three-phase separator and the second three-phase separator of the second embodiment of the present application.

[0036] In the figure: 10-sprayer; 11-first working fluid tank; 12-second valve; 13-first valve; 14-first high-pressure pump; 15-second high-pressure pump; 16-low-pressure pump; 17-first cooler; 20-rotary spray absorber; 21-second working fluid tank; 22-PH detection device; 23-sixth valve; 24-second cooler; 30-first separator; 31-third valve; 32-fourth valve; 33-fifth valve; 40-second separator; 50-slug flow catcher or gravity separator; 60-oil remover; 70-main sewage pipe; 80-first three-phase separator; 81-second three-phase separator; 82-first three-phase The air outlet valve of the separator; 84-the air inlet valve of the first three-phase separator; 85-the first sewage valve of the first three-phase separator; 86-the second sewage valve of the first three-phase separator; 87-the air inlet valve of the second three-phase separator; 88-the air inlet of the first three-phase separator; 89-the air outlet of the first three-phase separator; 90-the weir plate; 91-the heater; 92-the second sewage outlet of the first three-phase separator; 93-the first sewage outlet of the first three-phase separator; 94-the air outlet valve of the second three-phase separator; 95-the first sewage valve of the second three-phase separator; 96-the second sewage valve of the second three-phase separator; 97-the liquid collection area; 98-the ice collection area. DETAILED DESCRIPTION

[0037] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0038] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] Example 1:

[0041] To simplify the description, in this embodiment, the compressed air to be purified is referred to as raw gas, and the purified compressed air is referred to as product gas. As shown in Figure 1, the compressed air purification system of this embodiment includes a spray device and a rotary spray absorption device, wherein the spray device includes a sprayer 10 and a first working fluid tank 11, the first working fluid tank 11 is used to store the working fluid required by the sprayer 10, and the rotary spray absorption device includes a rotary spray absorber 20 and a second working fluid tank 21, and the second working fluid tank 21 is used to store the working fluid required by the rotary spray absorber 20. The liquid inlet of the sprayer 10 is connected to the first liquid outlet of the first working fluid tank 11 through a pipeline, the second liquid outlet of the first working fluid tank 11 is connected to the liquid inlet of the second working fluid tank 21, and the liquid outlet of the second working fluid tank 21 is connected to the liquid inlet of the rotary spray absorber 20.

[0042] On the one hand, the first working fluid tank 11 is connected to the liquid inlet of the sprayer 10 to provide the sprayer 10 with the working fluid required for spraying. On the other hand, it is connected to the liquid inlet of the second working fluid tank 21 to adjust the acid / alkali concentration of the working fluid in the second working fluid tank 21. The liquid outlet of the second working fluid tank 21 is connected to the liquid inlet of the rotary spray absorber 20 to provide the required working fluid to the rotary spray absorber 20. Therefore, the working fluid in the first working fluid tank 11 can further adjust the acid / alkali concentration of the working fluid required by the rotary spray absorber 20. There is a first high-pressure pump on the pipeline between the first liquid outlet of the first working fluid tank and the liquid inlet of the sprayer. By adjusting the outlet head of the first high-pressure pump, the amount of working fluid entering the sprayer from the first working fluid tank is adjusted. There is a first valve 13 and a low-pressure pump 16 on the pipeline between the second liquid outlet of the first working fluid tank 11 and the liquid inlet of the second working fluid tank 21. By opening the first valve 13 and adjusting the outlet lift of the low-pressure pump 16, the amount of working fluid entering the second working fluid tank 21 from the first working fluid tank 11 is adjusted, thereby adjusting the acid / alkali concentration of the working fluid in the second working fluid tank 21, and then adjusting the acid / alkali concentration of the working fluid entering the rotary spray absorber 20.

[0043] The second liquid outlet of the first working fluid tank 11 is also connected to the liquid inlet of the rotary jet absorber 20 through the first bypass branch. The rotary jet absorber 20 can directly use the working fluid in the first working fluid tank 11 through the first bypass branch. There is a second valve 12 on the first bypass branch. By opening the second valve 12, closing the first valve 13 and the sixth valve 23, and adjusting the outlet lift of the second high-pressure pump, the amount of working fluid entering the rotary jet absorber 20 from the first working fluid tank 11 can be adjusted.

[0044] The raw gas first enters the sprayer 10, where it is sprayed onto the compressed air by the working fluid in the first working fluid tank 11. The sprayer 10 primarily cleans and removes large oil droplets and dust from the raw gas, reducing the concentration of total dissolved solids (TDS) in the free water carried by the compressed air. In special circumstances, by selecting the working fluid in the first working fluid tank 11, the sprayed raw gas can also absorb a portion of the chemical solution.

[0045] The compressed air flowing out of the air outlet of the sprayer 10 enters the rotary spray absorber 20. The rotary spray absorber 20 is a device with both absorption, separation and drying functions. A cyclone field can be formed inside the rotary spray absorber. After the raw gas enters from the air inlet, it is subjected to centrifugal force. At the same time, the working fluid is sprayed in tangentially from the side and is atomized by the impact of the raw gas, forming countless working fluid droplets for absorption. The working fluid droplets react with the free water containing chemical impurities in the raw gas for absorption. Since a cyclone field can be formed inside the rotary spray absorber 20, the product gas is dry compressed air, which is discharged from the air outlet of the rotary spray absorber 20. The air outlet of the rotary spray absorber 20 is located at the center of the top of the rotary spray absorber, and the absorbed droplets after the reaction are discharged from the sewage outlet at the bottom of the rotary spray absorber.

[0046] Whether to open the first valve 13 or the second valve 12 is determined based on the chemical impurities dissolved in the free water in the feed gas. If the working fluid in the first working fluid tank 11 can be used to absorb impurities in the compressed air entering the rotary jet absorber 20, the second valve 12 is opened and the first valve 13 is closed. If a mixed working fluid, obtained by mixing the working fluid in the first working fluid tank 11 and the working fluid in the second working fluid tank 21, is required to absorb impurities in the compressed air entering the rotary jet absorber 20, the first valve 13 is opened and the second valve 12 is closed.

[0047] Therefore, the compressed air purification system of this embodiment can simultaneously remove oil, solid dust, free water, and chemical impurities dissolved in compressed air, and can also adapt the required impurity removal fluid according to the composition of these chemical impurities. It has the advantages of a wide purification range and high controllability. It can be widely used in the compressed air energy storage industry in the fields of petroleum, chemical industry, metallurgy, electricity, machinery, light industry, textiles, automobile manufacturing, electronics, food, medicine, biochemistry, national defense, and power energy storage.

[0048] Furthermore, as described above, the working fluid in the first working fluid tank is used for the sprayer 10, and the working fluid in the second working fluid tank is used for the rotary spray absorber 20. The working fluid in the second working fluid tank can be mixed by opening the first valve 13 and the sixth valve 23 through the working fluids in the first working fluid tank and the second working fluid tank. Therefore, the first working fluid tank is filled with water, alkali or acid, and the second working fluid tank is filled with alkali or acid. If the first working fluid tank is filled with water and the second working fluid tank is filled with alkali or acid, then the working fluid in the sprayer 10 is water, and the working fluid in the rotary spray absorber 20 is alkali liquid or acid liquid. If the first working fluid tank is filled with acid and the second working fluid tank is also filled with acid, or if the first working fluid tank is filled with alkali and the second working fluid tank is also filled with alkali, then the working fluid in the sprayer 10 and the working fluid in the rotary spray absorber 20 are both acid, or both alkali. If the first working fluid tank contains acid and the second working fluid tank contains alkali, or if the first working fluid tank contains alkali and the second working fluid tank contains acid, then the working fluid in the sprayer 10 is acidic or alkaline, and the working fluid in the rotary spray absorber 20 can be neutral, slightly acidic, or slightly alkaline, thereby increasing the purification range of the compressed air purification system.

[0049] Optionally, the water in the first working medium tank 11 may be desalted water, purified water, or distilled water.

[0050] Although the compressed air manufacturing method and storage method are different, the raw gas will contain free water, dust, and large oil droplets, and the chemical impurities are mainly divided into two situations: acidic and alkaline. The above-mentioned chemical impurities are dissolved in free water, and the impurity solution after dissolving in free water is acidic or alkaline as a whole. If the impurity solution after dissolving in free water is acidic as a whole, then the first working fluid tank 11 is filled with water, and the second working fluid tank 21 is filled with alkali, the first valve 13 and the sixth valve 23 are opened, and the second valve 12 is closed. The purification effect of the rotary spray absorber 20 is controlled by adjusting the alkali working fluid concentration in the second working fluid tank 21 and the outlet head of the second high-pressure pump. If the impurity solution after dissolving in free water is alkaline as a whole, then the first working fluid tank 11 is filled with water, and the second working fluid tank 21 is filled with acid, the first valve 13 and the sixth valve 23 are opened, and the second valve 12 is closed. The purification effect of the rotary spray absorber 20 is controlled by adjusting the acid working fluid concentration in the second working fluid tank 21 and the outlet head of the second high-pressure pump. If the impurity solution after dissolving in free water is neutral as a whole, then the first working medium tank 11 is filled with water, the first valve 13 and the sixth valve 23 are closed, and the second valve 12 is opened. The purification effect of the rotary spray absorber 20 is controlled by the outlet liquid head of the second high-pressure pump.

[0051] Optionally, a sixth valve 23 is provided at the outlet of the second working medium tank 21 .

[0052] Optionally, a first separator 30 is further provided between the sprayer 10 and the rotary spray absorber 20; the compressed air flowing out of the air outlet of the sprayer 10 enters the air inlet of the first separator 30, and then flows out of the air outlet of the first separator 30 and enters the air inlet of the rotary spray absorber 20; the first separator 30 is used to dry the compressed air. The compressed air after spraying will introduce excess working fluid, and then the above-mentioned working fluid will be further separated by the first separator, and the amount of total dissolved solid matter in the liquid carried in the compressed air will be further reduced. If the working fluid contained in the first working fluid tank 11 is water, then the compressed air after spraying will introduce water, and then the moisture in the compressed air will be further separated by the separator, and the amount of total dissolved matter in the liquid carried in the compressed air will be further reduced.

[0053] Optionally, the first separator 30 is a cyclone separator or a blade separator.

[0054] Optionally, a deoiler 60 is further provided between the sprayer 10 and the rotary spray absorber 20; the compressed air flowing out of the air outlet of the sprayer 10 enters the air inlet of the deoiler 60, and then flows out of the air outlet of the deoiler 60 and enters the air inlet of the rotary spray absorber 20; the deoiler 60 is used to remove oil from the compressed air. Impurities in the compressed air prepared by the compressor include oil substances, which mainly include large oil droplets, small oil droplets and emulsified oil droplets. Large oil droplets can be removed by the sprayer 10, and if the oil substance contains small oil droplets and emulsified oil droplets, they can be removed by the existing deoiler 60.

[0055] Optionally, the oil remover 60 is a coalescer, also known as a coalescing separator.

[0056] Optionally, in the compressed air purification system of this embodiment, a first separator 30 and a degreaser 60 are disposed between the sprayer 10 and the rotary jet absorber 20. Compressed air flowing out of the air outlet of the sprayer 10 enters the air inlet of the first separator 30. After flowing out of the air outlet of the first separator 30, it enters the degreaser 60 through a first branch; after flowing out of the air outlet of the degreaser 60, it enters the air inlet of the rotary jet absorber 20. Since the inlet precision requirements of a degreaser coalescer are generally higher than those of an ordinary separator, the degreaser 60 is disposed after the first separator 30. In the absence of the first separator 30, the degreaser separator can also be used alone between the sprayer 10 and the rotary jet absorber 20.

[0057] Optionally, a third valve 31 is provided on the first branch to control the opening and closing of the first branch. A fifth valve 33 is provided on the outlet pipe of the degreaser 60. The raw gas is first separated by the first separator 30 and then degreased by the degreaser 60, resulting in a more effective purification effect. By opening the third valve 31 and the fifth valve 33, compressed air flowing out of the outlet of the first separator 30 enters the degreaser 60 through the first branch.

[0058] Optionally, the air outlet of the first separator 30 further includes a second branch, the other end of the second branch is connected to the air inlet of the rotary jet absorber 20, and the compressed air flowing out of the second branch enters the air inlet of the rotary jet absorber 20. Furthermore, there is a fourth valve 32 on the second branch, and the fourth valve is used to control the opening and closing of the second branch. If the oil substances in the impurities in the compressed air do not have small oil droplets and emulsified oil droplets, then there is no need to pass through the degreaser 60. At this time, the fourth valve 32 is opened, and the third valve 31 and the fifth valve 33 are closed. The compressed air flowing out of the air outlet of the first separator 30 does not pass through the degreaser 60, but directly enters the rotary jet absorber 20.

[0059] Optionally, a slug flow catcher 50 is also provided before the inlet of the sprayer 10; the compressed air to be purified enters the air inlet of the slug flow catcher 50, flows out from the air outlet of the slug flow catcher 50 and enters the air inlet of the sprayer 10. When the raw gas passes through the undulating pipeline, the free water carried by it will accumulate at the bottom of the pipeline. After reaching a certain volume, a slug flow will appear in the pipe. Therefore, the raw gas first passes into the slug flow catcher to receive the slug flow that may appear before the compressed air to be purified enters the purification process, and separates the slug flow carried by the raw gas. The function of the slug flow catcher is to eliminate the slug flow, provide stable transportation for the downstream, and preliminarily separate a portion of the large particles of oil in the raw gas. Furthermore, the slug flow catcher can be of container type or pipeline type, which can be selected according to the site conditions.

[0060] Optionally, a second separator 40 is further provided on the outlet side of the rotary jet absorber 20. The compressed air flowing out of the air outlet of the rotary jet absorber 20 enters the air inlet of the second separator 40 and flows out of the air outlet of the second separator 40. The second separator 40 is used to dry the compressed air to ensure that the product gas is dry compressed air.

[0061] Optionally, the second separator 40 is a cyclone separator or a blade separator, which is selected according to the working conditions. If the operating conditions of the compressed air are stable, such as when the flow rate and pressure are stable, a cyclone separator is used; if the operating conditions of the compressed air have a wide range of flexibility, a blade separator is used.

[0062] Optionally, a pH detection device 22 is provided at the sewage outlet of the rotary jet absorber 20, and the opening and closing and opening degree of the first valve 13 and the second valve 12 are controlled by the pH detection device 22. The pH of the sewage discharged by the rotary jet absorber 20 controls the opening and closing and opening degree of the first valve 13 and the second valve 12, thereby controlling the acid / base concentration of the working fluid entering the rotary jet absorber 20. If the pH detection device 22 detects that the pH of the sewage outlet of the rotary jet absorber 20 is neutral, then the first valve 13 is closed and the second valve 12 is opened. At this time, the first working fluid enters the rotary jet absorber 20, that is, the working fluid of the rotary jet absorber 20 is the same as the working fluid of the sprayer 10, thereby improving the controllability of the purification. If the pH detection device 22 detects that the pH of the sewage outlet of the rotary jet absorber 20 is acidic or alkaline, then the second valve 12 is closed and the first valve 13 is opened. The pH detection device 22 detects the pH value to adjust the opening degree of the first valve 13, thereby adjusting the component concentration of the working fluid in the second working fluid tank 21.

[0063] Optionally, the liquid outlet pipeline of the second working fluid tank intersects and is connected with the first bypass branch, and a sixth valve is provided at the liquid outlet pipeline of the second working fluid tank; the opening and closing and the opening degree of the first valve 13 and the second valve 12 are controlled by the pH detection device 22. The pH of the sewage discharged by the rotary jet absorber 20 controls the opening and closing and the opening degree of the first valve 13, the second valve 12 and the sixth valve 23, thereby controlling the acid / base concentration of the working fluid entering the rotary jet absorber 20. If the pH detection device 22 detects that the pH of the sewage outlet of the rotary jet absorber 20 is neutral, then the first valve 13, the low-pressure pump 16 and the sixth valve 23 are closed, and the second valve 12 and the second high-pressure pump 15 are opened. At this time, the first working fluid enters the rotary jet absorber 20, that is, the working fluid of the rotary jet absorber 20 is the same as the working fluid of the sprayer 10, so as to avoid bringing the alkali / acid solution into the raw gas again. If the pH detection device 22 detects that the pH of the sewage outlet of the rotary spray absorber 20 is acidic or alkaline, then the second valve 12 is closed, and the first valve 13, the low-pressure pump 16, the sixth valve 23 and the second high-pressure pump 15 are opened. The pH detection device 22 detects the pH value to adjust the opening of the first valve 13 and the sixth valve 23, and the outlet pressure of the low-pressure pump 16 and the second high-pressure pump 15, thereby adjusting the component concentration of the working fluid in the second working fluid tank 21.

[0064] Optionally, a first high-pressure pump is further provided on the pipeline between the first liquid outlet of the first working fluid tank 11 and the liquid inlet of the sprayer 10; and / or, a second high-pressure pump is further provided on the first bypass branch; and / or, a low-pressure pump is further provided on the pipeline between the second liquid outlet of the first working fluid tank 11 and the liquid inlet of the second working fluid tank 21. Since the raw gas in the sprayer 10 and the rotary spray absorber 20 is in a medium-high pressure state, a high-pressure pump is used as a power transmission component on the pipeline between the first liquid outlet of the first working fluid tank 11 and the liquid inlet of the sprayer 10, as well as on the pipeline of the first bypass branch. Since there is a liquid path between the second liquid outlet of the first working fluid tank 11 and the liquid inlet of the second working fluid tank 21, and compressed air does not pass through, a low-pressure pump, such as a low-pressure water pump, is used between the first working fluid tank 11 and the second working fluid tank 21.

[0065] Optionally, a first cooler 17 is provided between the first liquid outlet of the first working fluid tank 11 and the liquid inlet of the sprayer 10; and / or a second cooler 24 is provided on the pipeline at the liquid inlet of the rotary spray absorber 20. The first cooler 17 is used to cool the working fluid delivered from the outlet of the first working fluid tank 11, and the second cooler 24 is used to cool the working fluid delivered from the outlet of the second working fluid tank 21, so as to reduce the amount of gaseous water carried by the raw gas. Both the first cooler 17 and the second cooler 24 can be heat exchangers, each having a cold source, through which the working fluid is cooled. The cold source can be a water cooler, for example.

[0066] Optionally, the sprayer 10, the rotary spray absorber 20, the first separator 30, the second separator 40, and the slug flow collector 50 in the compressed air purification system all have sewage outlets, and the above sewage outlets can be connected to the main sewage pipe 70 through pipelines.

[0067] Optionally, in addition to the first valve, the second valve, the third valve, the fourth valve, the fifth valve, and the sixth valve, pumps, valves, temperature sensors, and pressure sensors can be set in the compressed air purification system of this embodiment as needed, especially before and after the sprayer 10, the rotary jet absorber 20, the first separator 30, the second separator 40, and the slug flow catcher 50. Those skilled in the art can set pumps, valves, temperature sensors, pressure sensors and other sensors according to detection needs.

[0068] Optionally, the equipment and pipelines in the above-mentioned compressed air purification system are all medium and high pressure equipment.

[0069] Example 2:

[0070] This embodiment, based on the first embodiment, involves compressed air containing impurities including oil, solid matter, free water, and chemical impurities. The chemical impurities dissolve in the free water to form a chemical solution. When the temperature is below freezing, the free water and a portion of the chemical solution freeze, while the remaining portion remains in liquid form. Since the freezing point of oil is higher than its freezing point, when the free water freezes and solidifies, the oil also solidifies. Therefore, when the temperature is below freezing, the impure compressed air contains solid matter, solid ice, solid oil, and the liquid solution.

[0071] As shown in Figures 2 and 3, this embodiment provides a compressed air purification system, and a first three-phase separator 80 is also provided in front of the inlet of the sprayer; the compressed air to be purified enters the air inlet of the first three-phase separator 80, flows out from the air outlet of the first three-phase separator 80, and enters the air inlet of the sprayer 10.

[0072] As shown in FIG3 , the tank body of the first three-phase separator 80 includes an air inlet 88 of the first three-phase separator, an air outlet 89 of the first three-phase separator, a first sewage outlet 93 of the first three-phase separator, and a second sewage outlet 92 of the first three-phase separator. The tank body includes a weir plate 90, a liquid collection area 97, and an ice collection area 98. The bottom of the weir plate is connected to the inner bottom wall of the first three-phase separator, and a gas phase space is defined between the top of the weir plate and the inner top wall of the first three-phase separator. The windward side of the weir plate is the side facing the air inlet 88 of the first three-phase separator, and the leeward side of the weir plate is the back side of the windward side of the weir plate. The liquid collection area 97 is located in the space below the windward side of the weir plate. The ice collection area 98 is located in the space below the leeward side of the weir plate. The ice collection area 98 has a heater 91 for heating the ice collection area 98. The first sewage outlet 93 of the first three-phase separator is located at the bottom of the liquid collection area 97, and the second sewage outlet 92 of the first three-phase separator is located at the bottom of the ice collection area 98.

[0073] Compressed air to be purified enters the air inlet 88 of the first three-phase separator. Solid matter, solid ice, solid oil, and liquid solutions contained in the compressed air enter the liquid collection area. As the liquid level in the liquid collection area rises above the top of the weir plate, the solid oil, solid ice, and impure ice, due to their low density, will flow over the weir plate and into the ice collection area. The bottom of the liquid collection area is located at the first drain outlet 93 of the first three-phase separator, from which high-density solid matter and liquid are discharged. The ice collection area is equipped with a heater 91, which heats the solid oil, solid ice, and impure ice separated into the ice collection area, converting them into liquid form and restoring the fluidity of the oil. The oil is then discharged from the second drain outlet 92 of the first three-phase separator at the bottom of the ice collection area.

[0074] Optionally, the heater 91 can be located inside the ice collection area or on the outer wall of the ice collection area. A heating rod can be used as a heater inside the ice collection area, which has higher thermal efficiency; a heating tape can also be used as a heater on the outer wall of the ice collection area, which makes the heating area of ​​the ice collection area more uniform. The pipeline of the first three-phase separator's air inlet 88 is provided with the first three-phase separator's air inlet valve 84, the pipeline of the first three-phase separator's air outlet 89 is provided with the first three-phase separator's air outlet valve 82, the pipeline of the first three-phase separator's first sewage outlet 93 is provided with the first three-phase separator's second sewage outlet valve 86, and the pipeline of the first three-phase separator's second sewage outlet 92 is provided with the first three-phase separator's first sewage outlet valve 85.

[0075] The second three-phase separator 81 of this embodiment can have the same structure as the first three-phase separator. The second three-phase separator is connected in parallel with the first three-phase separator. When the first three-phase separator needs to be switched or overhauled, the second three-phase separator is activated. There is an air inlet valve 87 of the second three-phase separator on the air inlet pipeline of the second three-phase separator 81. When the first three-phase separator needs to be switched or overhauled, the air inlet valve 84 of the first three-phase separator, the air outlet valve 82 of the first three-phase separator, the first drain valve 85 of the first three-phase separator, and the second drain valve 86 of the first three-phase separator are closed, and the air inlet valve 87 of the second three-phase separator, the air outlet valve 94 of the second three-phase separator, the first drain valve 95 of the second three-phase separator, and the second drain valve 96 of the second three-phase separator are opened, and separation is performed using the second three-phase separator. Of course, a third three-phase separator can also be set up in parallel with the first three-phase separator and the second three-phase separator.

[0076] As shown in Figure 2, the compressed air purification system of this embodiment includes a first three-phase separator 80, a second three-phase separator 81, a sprayer 10, and a rotary spray absorber 20, wherein the first three-phase separator 80 and the second three-phase separator 81 are connected in parallel and are both connected to the air inlet of the sprayer 10. When the air inlet valve 84 and the air outlet valve 82 of the first three-phase separator are opened, the compressed air to be purified enters from the air inlet 88 of the first three-phase separator, flows out from the air outlet 89 of the first three-phase separator, and then enters the air inlet of the sprayer 10. After flowing out from the air outlet of the sprayer 10, it enters the air inlet of the rotary spray absorber 20. The compressed air flowing out of the rotary spray absorber 20 is the purified compressed air. A spraying device and a rotary spray absorption device, wherein the spraying device includes a sprayer and a first working fluid tank, and the rotary spray absorption device includes a rotary spray absorber and a second working fluid tank; the liquid inlet of the sprayer is connected to the first liquid outlet of the first working fluid tank through a pipeline, the second liquid outlet of the first working fluid tank is connected to the liquid inlet of the second working fluid tank, and the liquid outlet of the second working fluid tank is connected to the liquid inlet of the rotary spray absorber; the second liquid outlet of the first working fluid tank is also connected to the liquid inlet of the rotary spray absorber through a first bypass branch; a first valve is provided on the pipeline between the second liquid outlet of the first working fluid tank and the liquid inlet of the second working fluid tank; a second valve is provided on the first bypass branch.

[0077] Optionally, a first separator is further provided between the sprayer and the rotary spray absorber; the compressed air flows out from the air outlet of the sprayer and enters the air inlet of the first separator, and then flows out from the air outlet of the first separator and enters the air inlet of the rotary spray absorber; the first separator is used to dry the compressed air.

[0078] Optionally, a second separator is further provided on the outlet side of the rotary jet absorber, and the compressed air flowing out of the air outlet of the rotary jet absorber enters the air inlet of the second separator and flows out from the air outlet of the second separator.

[0079] As described above, a first valve 13 is provided on the pipeline between the second liquid outlet of the first working fluid tank and the liquid inlet of the second working fluid tank. Furthermore, there is a low-pressure pump 16, a second high-pressure pump 15 is provided between the liquid outlet of the second working fluid tank and the liquid inlet of the rotary spray absorber, and a sixth valve 23 is provided at the liquid outlet of the second working fluid tank, and the outlet of the sixth valve 23 is connected to the inlet of the second high-pressure pump 15.

[0080] Optionally, a pH detection device 22 is provided at the sewage outlet of the rotary jet absorber 20, and the opening and closing and the opening degree of the first valve 13, the second valve 12 and the sixth valve 23 are controlled by the pH detection device 22. The pH of the sewage discharged by the rotary jet absorber 20 controls the opening and closing and the opening degree of the first valve 13, the second valve 12 and the sixth valve 23, thereby controlling the acid / alkali concentration of the working fluid entering the rotary jet absorber 20. If the pH detection device 22 detects that the pH of the sewage outlet of the rotary jet absorber 20 is neutral, then the first valve 13, the low-pressure pump 16 and the sixth valve 23 are closed, and the second valve 12 and the second high-pressure pump 15 are opened. At this time, the first working fluid enters the rotary jet absorber 20, that is, the working fluid of the rotary jet absorber 20 is the same as the working fluid of the sprayer 10, thereby avoiding the alkali / acid solution from being brought into the raw gas again. If the pH detection device 22 detects that the pH of the sewage outlet of the rotary spray absorber 20 is acidic or alkaline, then the second valve 12 is closed, and the first valve 13, the low-pressure pump 16, the sixth valve 23 and the second high-pressure pump 15 are opened. The pH detection device 22 detects the pH value to adjust the opening of the first valve 13 and the sixth valve 23, and the outlet pressure of the low-pressure pump 16 and the second high-pressure pump 15, thereby adjusting the component concentration of the working fluid in the second working fluid tank 21.

[0081] Optionally, a first high-pressure pump 14 is further provided on the pipeline between the first liquid outlet of the first working fluid tank 11 and the liquid inlet of the sprayer 10; and / or a second high-pressure pump 15 is further provided on the first bypass branch; and / or a low-pressure pump 16 is further provided on the pipeline between the second liquid outlet of the first working fluid tank 11 and the liquid inlet of the second working fluid tank 21. Since the raw gas in the sprayer 10 and the rotary spray absorber 20 is in a medium-high pressure state, a high-pressure pump is used as a power transmission component on the pipeline between the first liquid outlet of the first working fluid tank 11 and the liquid inlet of the sprayer 10, as well as on the pipeline of the first bypass branch. Since the second liquid outlet of the first working fluid tank 11 and the liquid inlet of the second working fluid tank 21 are a liquid path and compressed air is not passed through, a low-pressure pump, such as a low-pressure water pump, is used between the first working fluid tank 11 and the second working fluid tank 21.

[0082] Optionally, a first cooler 17 is provided between the first liquid outlet of the first working fluid tank 11 and the liquid inlet of the sprayer 10; and / or a second cooler 24 is provided on the pipeline at the liquid inlet of the rotary spray absorber 20. The first cooler 17 is used to cool the working fluid delivered from the outlet of the first working fluid tank 11, and the second cooler 24 is used to cool the working fluid delivered from the outlet of the second working fluid tank 21, so as to reduce the amount of gaseous water carried by the raw gas. Both the first cooler 17 and the second cooler 24 can be heat exchangers, each having a cold source, through which the working fluid is cooled. The cold source can be a water cooler, for example.

[0083] Optionally, the equipment and pipelines in the above-mentioned compressed air purification system are all medium and high pressure equipment.

[0084] The compressed air purification system in this embodiment is suitable for operating conditions where the feed gas temperature is below freezing. It can simultaneously remove solid matter, solid ice, solid oil, solid impurity ice, and liquid impurity solutions carried by the compressed air. It can also adapt the required impurity removal fluid to the composition of the chemical impurities, offering the advantages of a wide purification range, wide geographical applicability, and high controllability.

[0085] Obviously, the above embodiments of the present application are merely examples for the purpose of clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other variations or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the claims of the present application.

Claims

1. A compressed air purification system, characterized in that: It includes a spraying device and a rotary spray absorption device, wherein the spraying device includes a sprayer and a first working fluid tank, and the rotary spray absorption device includes a rotary spray absorber and a second working fluid tank; The liquid inlet of the sprayer is connected to the first liquid outlet of the first working fluid tank via a pipeline, the second liquid outlet of the first working fluid tank is connected to the liquid inlet of the second working fluid tank, and the liquid outlet of the second working fluid tank is connected to the liquid inlet of the rotary spray absorber via a pipeline; the second liquid outlet of the first working fluid tank is also connected to the liquid inlet of the rotary spray absorber via a pipeline via a first bypass branch; a first valve is provided on the pipeline between the second liquid outlet of the first working fluid tank and the liquid inlet of the second working fluid tank; and a second valve is provided on the first bypass branch; The compressed air to be purified enters the air inlet of the sprayer, flows out from the air outlet of the sprayer and then enters the air inlet of the rotary spray absorber.

2. The compressed air purification system according to claim 1, characterized in that: A first separator is further provided between the sprayer and the rotary spray absorber; The compressed air flows out of the air outlet of the sprayer and enters the air inlet of the first separator, and then flows out of the air outlet of the first separator and enters the air inlet of the rotary spray absorber; The first separator is used to dry the compressed air.

3. The compressed air purification system according to claim 2, characterized in that: An oil remover is also provided between the first separator and the rotary spray absorber; the air outlet of the first separator is connected to the air inlet of the oil remover through a first branch, and the air outlet of the oil remover is connected to the air inlet of the rotary spray absorber; a third valve is provided on the first branch; and a fifth valve is provided at the air outlet of the oil remover.

4. The compressed air purification system according to claim 3, characterized in that: The air outlet of the first separator also includes a second branch, one end of the second branch is connected to the air outlet of the first separator, and the other end of the second branch is connected to the outlet pipe of the fifth valve. The compressed air flowing out of the second branch enters the air inlet of the rotary spray absorber; a fourth valve is provided on the second branch.

5. The compressed air purification system according to claim 1, characterized in that: A slug flow catcher is also provided before the inlet of the sprayer; The compressed air to be purified enters the air inlet of the slug flow catcher, flows out from the air outlet of the slug flow catcher, and then enters the air inlet of the sprayer.

6. The compressed air purification system according to claim 1, characterized in that: A second separator is further provided on the outlet side of the rotary jet absorber. The compressed air flowing out of the air outlet of the rotary jet absorber enters the air inlet of the second separator and flows out from the air outlet of the second separator.

7. The compressed air purification system according to claim 1, characterized in that: The first working fluid tank is filled with water, alkali or acid, and the second working fluid tank is filled with alkali or acid.

8. The compressed air purification system according to claim 1, characterized in that: A sixth valve is provided at the outlet of the second working fluid tank; the first working fluid tank is filled with water, the second working fluid tank is filled with alkali, the first valve and the sixth valve are opened, and the second valve is closed, for purifying the compressed air.

9. The compressed air purification system according to claim 1, characterized in that: A sixth valve is provided at the outlet of the second working fluid tank; the first working fluid tank is filled with water, the second working fluid tank is filled with acid, the first valve and the sixth valve are opened, and the second valve is closed, for purifying the compressed air.

10. The compressed air purification system according to claim 1, characterized in that: A sixth valve is provided at the outlet of the second working fluid tank; the first working fluid tank is filled with water, the first valve and the sixth valve are closed, and the second valve is opened to purify the compressed air.

11. The compressed air purification system according to claim 2 or 6, characterized in that: The first separator is a cyclone separator or a blade separator; and / or the second separator is a cyclone separator or a blade separator.

12. The compressed air purification system according to claim 1, characterized in that: A first cooler is provided between the first liquid outlet of the first working medium tank and the liquid inlet of the sprayer; and / or a second cooler is provided on the pipeline at the liquid inlet of the rotary spray absorber.

13. The compressed air purification system according to claim 1, characterized in that: A first high-pressure pump is further provided on the pipeline between the first liquid outlet of the first working medium tank and the liquid inlet of the sprayer; And / or, a second high-pressure pump is provided at the liquid inlet of the rotary spray absorber, the outlet of the second high-pressure pump is connected to the liquid inlet of the rotary spray absorber, a sixth valve is provided at the liquid outlet pipeline of the second working fluid tank, the inlet of the sixth valve is connected to the liquid outlet of the second working fluid tank, the outlet of the sixth valve is connected to the outlet of the second valve, and the outlet of the sixth valve and the outlet of the second valve are both connected to the inlet of the second high-pressure pump; and / or, a low-pressure pump is also provided on the pipeline between the second liquid outlet of the first working fluid tank and the liquid inlet of the second working fluid tank.

14. The compressed air purification system according to claim 13, characterized in that: A pH detection device is provided at the sewage outlet of the rotary spray absorber; Controlling the first valve and the sixth valve to be opened and the second valve to be closed by the pH detection device; or controlling the second valve to be opened and the first valve and the sixth valve to be closed by the pH detection device; And / or, the outlet pressures of the low-pressure pump and the second high-pressure pump are controlled by the pH detection device.

15. The compressed air purification system according to claim 3, characterized in that: The deoiler uses an oil removal coalescer.

16. The compressed air purification system according to claim 1, characterized in that: A first three-phase separator is also provided before the inlet of the sprayer; The compressed air to be purified enters the air inlet of the first three-phase separator, flows out from the air outlet of the first three-phase separator, and then enters the air inlet of the sprayer.

17. The compressed air purification system according to claim 16, characterized in that: The first three-phase separator includes a weir plate, a liquid collection area, and an ice collection area; The bottom of the weir plate is connected to the inner bottom wall of the first three-phase separator, and a gas phase space is formed between the top of the weir plate and the inner top wall of the first three-phase separator; The windward side of the weir plate is the side facing the air inlet of the first three-phase separator, and the leeward side of the weir plate is the back side of the windward side of the weir plate; the liquid collection area is located in the space below the windward side of the weir plate; the ice collection area is located in the space below the leeward side of the weir plate; the ice collection area has a heater, and the heater is used to heat the ice collection area; The first sewage outlet of the first three-phase separator is located at the bottom of the liquid collection area, and the second sewage outlet of the first three-phase separator is located at the bottom of the ice collection area.

18. The compressed air purification system according to claim 16, characterized in that: A second three-phase separator is further provided before the inlet of the sprayer, and the second three-phase separator is connected in parallel with the first three-phase separator; The compressed air to be purified enters the air inlet of the first three-phase separator, flows out from the air outlet of the first three-phase separator, and then enters the air inlet of the sprayer; or, the compressed air to be purified enters the air inlet of the second three-phase separator, flows out from the air outlet of the second three-phase separator, and then enters the air inlet of the sprayer.

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