A compressed air purification system

Abstract

This invention discloses a compressed air purification system, relating to the field of compressed air purification technology. The compressed air purification system of this invention includes a spray device and a swirl-jet absorption device. The spray device includes a sprayer and a first working fluid tank, and the swirl-jet absorption device includes a swirl-jet absorber and a second working fluid tank. The inlet of the sprayer is connected to the first outlet of the first working fluid tank via a pipeline, the second outlet of the first working fluid tank is connected to the inlet of the second working fluid tank, and the outlet of the second working fluid tank is connected to the inlet of the swirl-jet absorber. This compressed air purification system solves the technical problems of limited applicability and low controllability of existing compressed air purification systems, and can be widely used in compressed air energy storage industries in the petroleum, chemical, metallurgical, power, machinery, light industry, textile, automobile manufacturing, electronics, food, pharmaceutical, biochemical, defense, and power energy storage fields.

Description

Technical Field

[0001] This invention relates to the field of compressed air purification technology, and more particularly to a compressed air purification system. Background Technology

[0002] Compressed air is air compressed by external force. Air is compressible; compressed air is air whose volume is reduced and pressure increased after being processed by an air compressor. Compressed air is an important power source. Compared with other energy sources, it has the following distinct characteristics: clear and transparent, convenient to transport, no special harmful properties, no fire hazard, unaffected by overload, able to work in many adverse environments, and abundant on the ground. Compressed air is a versatile process gas source, with applications spanning petroleum, chemical, metallurgical, power, machinery, light industry, textile, automobile manufacturing, electronics, food, pharmaceutical, biochemical, defense, and scientific research industries and sectors. In most cases, compressed air needs to be purified before being supplied to users.

[0003] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art:

[0004] Compressed air manufacturing and storage methods differ, resulting in variations in the impurities present in the compressed air. For example, reciprocating compressors used in compressed air production contain oil, producing compressed air containing oily substances, which can be further subdivided into large oil droplets, small oil droplets, and emulsified oil droplets. Compressed air storage devices may introduce acid ions, acidic or alkaline gases, a phenomenon particularly pronounced in underground storage. Furthermore, one of the byproducts of compressed air is free water, and the aforementioned acidic or alkaline gases are highly soluble in free water, existing in ionic form. Compressed air storage devices may also contain solid particulate impurities such as dust, silt, rust, and rock salt particles. Compressed air containing these impurities poses serious safety hazards during subsequent use, primarily in two aspects: firstly, if the compressed air is introduced into process units, the impurities may affect the normal operation of the main process units. On the other hand, devices that use compressed air at the user end are usually made of steel. Ordinary steel is highly susceptible to electrochemical corrosion under conditions of humid air containing impurities. Since compressed air is typically used in medium- and high-pressure environments, corrosion can lead to very serious consequences such as steel plate breakage and gas leakage. Furthermore, existing compressed air purification systems suffer from technical problems such as a limited range of purifiable impurities, limited applicability to certain operating conditions, and low controllability of the purification process.

[0005] Therefore, how to provide a compressed air purification system that can simultaneously remove oil, solid dust, free water and dissolved chemical impurities carried in compressed air, and adapt to various types of impurities, producing clean and dry compressed gas after purification, which is convenient for subsequent applications in various situations, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention 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.

[0007] To achieve this objective, a compressed air purification system is provided, comprising a spray device and a swirl-jet absorption device. The spray device includes a sprayer and a first working fluid tank, and the swirl-jet absorption device includes a swirl-jet absorber and a second working fluid tank. The inlet of the sprayer is connected to the first outlet of the first working fluid tank via a pipeline, the second outlet of the first working fluid tank is connected to the inlet of the second working fluid tank, and the outlet of the second working fluid tank is connected to the inlet of the swirl-jet absorber via a pipeline. The second outlet of the first working fluid tank is also connected to the inlet of the swirl-jet absorber via a pipeline through a first bypass branch. A first valve is provided on the pipeline between the second outlet of the first working fluid tank and the 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 inlet of the sprayer, flows out from the outlet of the sprayer, and then enters the inlet of the swirl-jet absorber.

[0008] Furthermore, a first separator is provided between the sprayer and the swirl jet absorber; compressed air flows out from the outlet of the sprayer and into the inlet of the first separator, and then flows out from the outlet of the first separator and into the inlet of the swirl jet absorber; the first separator is used to dry the compressed air.

[0009] Furthermore, an oil separator is also provided between the first separator and the swirl jet absorber; the air outlet of the first separator is connected to the air inlet of the oil separator through a first branch, and the air outlet of the oil separator is connected to the air inlet of the swirl jet absorber; a third valve is provided on the first branch; and a fifth valve is provided at the air outlet of the oil separator.

[0010] Furthermore, the outlet of the first separator also includes a second branch, one end of which is connected to the outlet of the first separator, and the other end of which is connected to the outlet pipe of the fifth valve. Compressed air flowing out from the second branch enters the inlet of the swirl jet absorber; a fourth valve is provided on the second branch.

[0011] Furthermore, a slug trap is provided before the inlet of the sprayer; the compressed air to be purified enters the inlet of the slug trap, flows out from the outlet of the slug trap, and then enters the inlet of the sprayer.

[0012] Furthermore, a second separator is provided on the outlet side of the swirl jet absorber. Compressed air flowing out from the outlet of the swirl jet absorber enters the inlet of the second separator and flows out from the outlet of the second separator.

[0013] Furthermore, the first working fluid tank contains water, alkali, or acid, and the second working fluid tank contains alkali or acid.

[0014] Furthermore, the first separator is a cyclone separator or a blade separator; and / or, the second separator is a cyclone separator or a blade separator.

[0015] Furthermore, a first cooler is provided between the first outlet of the first working fluid tank and the inlet of the sprayer; and / or, a second cooler is provided on the pipeline at the inlet of the swirl spray absorber.

[0016] Furthermore, a first high-pressure pump is also provided on the pipeline between the first outlet of the first working fluid tank and the inlet of the sprayer; and / or, a second high-pressure pump is provided at the inlet of the swirl jet absorber, the outlet of the second high-pressure pump is connected to the inlet of the swirl jet absorber, a sixth valve is provided at the outlet pipeline of the second working fluid tank, the inlet of the sixth valve is connected to the outlet of the second working fluid tank, the outlet of the sixth valve is connected to the outlet of the second valve, and the outlets of the sixth valve and 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 outlet of the first working fluid tank and the inlet of the second working fluid tank.

[0017] Furthermore, a pH detection device is installed at the drain outlet of the rotary jet absorber; the pH detection device controls the opening of the first valve and the sixth valve, and the closing of the second valve; or the pH detection device controls the opening of the second valve, and the closing of the first valve and the sixth valve; and / or the pH detection device controls the outlet pressure of the low-pressure pump and the second high-pressure pump.

[0018] Furthermore, the oil separator uses an oil coalescer.

[0019] Furthermore, a first three-phase separator is provided before the inlet of the sprayer; the compressed air to be purified enters the inlet of the first three-phase separator, flows out from the outlet of the first three-phase separator, and then enters the inlet of the sprayer.

[0020] Furthermore, the first three-phase separator includes a weir plate, a liquid collection zone, and an ice collection zone; 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 side of the windward side of the weir plate; the liquid collection zone is located in the space below the windward side of the weir plate; the ice collection zone is located in the space below the leeward side of the weir plate; the ice collection zone has a heater, which is used to heat the ice collection zone; the first drain outlet of the first three-phase separator is located at the bottom of the liquid collection zone, and the second drain outlet of the first three-phase separator is located at the bottom of the ice collection zone.

[0021] Furthermore, 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 inlet of the first three-phase separator, flows out from the outlet of the first three-phase separator, and then enters the inlet of the sprayer; or, the compressed air to be purified enters the inlet of the second three-phase separator, flows out from the outlet of the second three-phase separator, and then enters the inlet of the sprayer.

[0022] One of the above technical solutions has the following advantages or beneficial effects:

[0023] The compressed air purification system includes a spray device and a swirl-jet absorption device. The spray device includes a sprayer and a first working fluid tank, which stores the working fluid required by the sprayer. The swirl-jet absorption device includes a swirl-jet absorber and a second working fluid tank, which stores the working fluid required by the swirl-jet absorber. The inlet of the sprayer is connected to the first outlet of the first working fluid tank via a pipeline. The second outlet of the first working fluid tank is connected to the inlet of the second working fluid tank, and the outlet of the second working fluid tank is connected to the inlet of the swirl-jet absorber. The first working fluid tank is connected to the inlet of the sprayer, providing the sprayer with the required working fluid; it is also connected to the inlet of the second working fluid tank, allowing adjustment of the concentration of the working fluid in the second working fluid tank. The outlet of the second working fluid tank is connected to the inlet of the swirl-jet absorber, providing the absorber with the required working fluid. Therefore, the working fluid in the first working fluid tank can further adjust the concentration of the working fluid provided by the swirl-jet absorber. A first valve is located on the pipeline between the second outlet of the first working fluid tank and the 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 further adjusting the component concentration of the working fluid entering the rotary jet absorber.

[0024] The second outlet of the first working fluid tank is also connected to the inlet of the swirl jet absorber through the first bypass branch. The swirl jet 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 entering the swirl jet absorber from the first working fluid tank can be adjusted.

[0025] 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 (TDS) of free water carried in the compressed air. The compressed air flowing out of the sprayer's outlet enters the swirl jet absorber tangentially from the side. A swirling flow field is formed inside the swirl jet absorber. The compressed air to be purified enters through the inlet and is subjected to centrifugal force. At the same time, the working fluid is sprayed radially from the side and is impacted, cut, and atomized by the compressed air to be purified, forming numerous working fluid droplets for absorption. These working fluid droplets react with the free water containing chemical impurities in the compressed air to be purified. Because a swirling flow field is formed inside the swirl jet absorber, the purified compressed air is dry and is discharged from the outlet of the swirl jet absorber. The outlet of the swirl jet absorber is located at the center of the top of the swirl jet absorber, and the absorbed droplets after the reaction are discharged from the drain port at the bottom of the swirl jet absorber.

[0026] The decision to open the first or second valve depends on the chemical impurities dissolved in the free water in the compressed air to be purified. If the working fluid in the first tank can be used to absorb impurities in the compressed air entering the rotary jet absorber, then the second valve is opened and the first valve is closed. If a mixture of the working fluids from the first and second tanks is needed to absorb impurities in the compressed air entering the rotary jet absorber, then the first valve is opened and the second valve is closed.

[0027] Based on this, compressed air purification systems can simultaneously remove oil, solid dust, free water, and dissolved chemical impurities carried in compressed air. They can also adapt the required purification working fluid according to the composition of these chemical impurities, offering advantages such as a wide purification range and high controllability. The compressed air purified by the system is high-quality, clean, and dry, facilitating its application in various situations. It can be widely used in compressed air energy storage industries within the petroleum, chemical, metallurgical, power, machinery, light industry, textile, automotive manufacturing, electronics, food, pharmaceutical, biochemical, defense, and power energy storage sectors. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating Embodiment 1 of the present invention;

[0029] Figure 2 This is a flowchart illustrating Embodiment 2 of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the first three-phase separator and the second three-phase separator in Embodiment 2 of the present invention.

[0031] In the diagram: 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-Swirl 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 trap or gravity separator; 60-Oil separator; 70-Main drain pipe; 80-First three-phase separator; 81-Second three-phase separator; 82-First three-phase separator 84 - Air outlet valve of the separator; 85 - Air inlet valve of the first three-phase separator; 86 - First drain valve of the first three-phase separator; 87 - Air inlet valve of the second three-phase separator; 88 - Air inlet of the first three-phase separator; 89 - Air outlet of the first three-phase separator; 90 - Weir plate; 91 - Accompanying heater; 92 - Second drain outlet of the first three-phase separator; 93 - First drain outlet of the first three-phase separator; 94 - Air outlet valve of the second three-phase separator; 95 - First drain valve of the second three-phase separator; 96 - Second drain valve of the second three-phase separator; 97 - Liquid collection area; 98 - Ice collection area. Detailed Implementation

[0032] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] Example 1:

[0036] For simplicity, this embodiment refers to the compressed air to be purified as raw material air and the purified compressed air as product air. Figure 1 As shown, the compressed air purification system of this embodiment includes a spray device and a swirl-jet absorption device. The spray device includes a sprayer 10 and a first working fluid tank 11, which stores the working fluid required by the sprayer 10. The swirl-jet absorption device includes a swirl-jet absorber 20 and a second working fluid tank 21, which stores the working fluid required by the swirl-jet absorber 20. The inlet of the sprayer 10 is connected to the first outlet of the first working fluid tank 11 via a pipeline. The second outlet of the first working fluid tank 11 is connected to the inlet of the second working fluid tank 21. The outlet of the second working fluid tank 21 is connected to the inlet of the swirl-jet absorber 20.

[0037] The first working fluid tank 11 is connected to the inlet of the sprayer 10, providing the sprayer 10 with the working fluid required for spraying. It is also connected to the inlet of the second working fluid tank 21, adjusting the acid / alkali concentration of the working fluid in the second working fluid tank 21. The outlet of the second working fluid tank 21 is connected to the inlet of the rotary spray absorber 20, providing the rotary spray absorber 20 with the required working fluid. Therefore, the working fluid in the first working fluid tank 11 can further adjust the acid / alkali concentration of the working fluid provided by the rotary spray absorber 20. A first high-pressure pump is installed on the pipeline between the first outlet of the first working fluid tank and the 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. A first valve 13 and a low-pressure pump 16 are located on the pipeline between the second outlet of the first working fluid tank 11 and the inlet of the second working fluid tank 21. By opening the first valve 13 and adjusting the outlet head 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 further adjusting the acid / alkali concentration of the working fluid entering the rotary jet absorber 20.

[0038] The second outlet of the first working fluid tank 11 is also connected to the 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 third valve 23, and adjusting the outlet head 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.

[0039] The raw material gas first enters the sprayer 10, where it is sprayed by the working fluid in the first working fluid tank 11. The main function of the sprayer 10 is to clean and remove large oil droplets and dust from the raw material gas, and reduce the concentration of total dissolved solids (TDS) carried in the compressed air. Under special circumstances, depending on the type of working fluid in the first working fluid tank 11, the sprayed raw material gas can also absorb a portion of the chemical solution.

[0040] Compressed air flowing from the outlet of sprayer 10 enters the swirl jet absorber 20. The swirl jet absorber 20 is a device that combines absorption, separation, and drying functions. It creates a swirling flow field inside. The raw material gas enters through the inlet and is subjected to centrifugal force. Simultaneously, the working fluid is tangentially injected from the side, impacted, cut, and atomized by the raw material gas, forming numerous working fluid droplets for absorption. These droplets react with free water containing chemical impurities in the raw material gas. Because a swirling flow field is formed inside the swirl jet absorber 20, the product gas, which is dry compressed air, exits from the outlet of the swirl jet absorber 20. The outlet of the swirl jet absorber 20 is located at the center of the top of the absorber. The absorbed droplets after the reaction are discharged from the drain port at the bottom of the absorber.

[0041] The decision to open either the first valve 13 or the second valve 12 is 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, then the second valve 12 is opened and the first valve 13 is closed. If a mixed working fluid solution (made by blending the working fluids from the first working fluid tank 11 and the second working fluid tank 21) is needed to absorb impurities in the compressed air entering the rotary jet absorber 20, then the first valve 13 is opened and the second valve 12 is closed.

[0042] Therefore, the compressed air purification system of this embodiment can simultaneously remove oil, solid dust, free water, and dissolved chemical impurities carried in compressed air. It can also adapt the required purification working fluid according to the composition of the aforementioned chemical impurities, offering advantages such as a wide purification range and high controllability. It can be widely used in compressed air energy storage industries in the petroleum, chemical, metallurgical, power, machinery, light industry, textile, automobile manufacturing, electronics, food, pharmaceutical, biochemical, defense, and power energy storage fields.

[0043] Further, as described above, the working fluid in the first working fluid tank is used in the sprayer 10, and the working fluid in the second working fluid tank is used in 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 third valve 23, using the working fluids from both tanks. Therefore, the first working fluid tank contains water, alkali, or acid, and the second working fluid tank contains alkali or acid. If the first working fluid tank contains water and the second working fluid tank contains alkali or acid, then the working fluid in the sprayer 10 is water, and the working fluid in the rotary spray absorber 20 is either alkali or acid. If the first working fluid tank contains acid, and the second working fluid tank also contains acid, or if the first working fluid tank contains alkali, and the second working fluid also contains alkali, then both the working fluid in the sprayer 10 and the working fluid in the rotary spray absorber 20 are either acid or both are alkali. If the first working fluid tank contains acid and the second working fluid tank contains alkali, or vice versa, then the working fluid in the sprayer 10 can be either acid or alkali, while the working fluid in the rotary spray absorber 20 can be neutral, slightly acidic, or slightly alkaline. This improves the purification range of the compressed air purification system.

[0044] Preferably, the water in the first working fluid tank 11 can be one of desalinated water, purified water, or distilled water.

[0045] Although compressed air manufacturing and storage methods differ, the raw air will contain free water, dust, and large oil droplets. Chemical impurities are mainly categorized into acidic and alkaline types. These impurities dissolve in free water, resulting in a solution that is either entirely acidic or entirely alkaline. If the solution is acidic, the first working fluid tank 11 contains water, and the second working fluid tank 21 contains alkali. The first valve 13 and the third valve 23 are opened, and the second valve 12 is closed. The purification effect of the rotary jet absorber 20 is controlled by adjusting the concentration of the alkaline working fluid in the second working fluid tank 21 and the outlet head of the second high-pressure pump. If the solution is alkaline, the first working fluid tank 11 contains water, and the second working fluid tank 21 contains acid. The first valve 13 and the third valve 23 are opened, and the second valve 12 is closed. The purification effect of the rotary jet absorber 20 is controlled by adjusting the concentration of the acid working fluid 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 or the overall solution is neutral, then the first working fluid tank 11 contains water. The first valve 13 and the third valve 23 are closed, and the second valve 12 is opened. The purification effect of the swirl jet absorber 20 is controlled by the outlet liquid head of the second high-pressure pump.

[0046] Furthermore, a sixth valve 23 is provided at the outlet of the second working fluid tank 21.

[0047] Furthermore, a first separator 30 is provided between the sprayer 10 and the swirl-jet absorber 20; compressed air flows out of the outlet of the sprayer 10 and into the inlet of the first separator 30, and then flows out of the outlet of the first separator 30 and into the inlet of the swirl-jet absorber 20; the first separator 30 is used to dry the compressed air. Excess working fluid is introduced into the sprayed compressed air, which is then further separated by the first separator, further reducing the amount of total dissolved solids in the liquid carried in the compressed air. If the working fluid in the first working fluid tank 11 is water, water will be introduced into the sprayed compressed air, which will then be further separated by the separator, further reducing the amount of total dissolved solids in the liquid carried in the compressed air.

[0048] Furthermore, the first separator 30 mentioned above is a cyclone separator or a blade separator.

[0049] Furthermore, an oil separator 60 is provided between the sprayer 10 and the swirl spray absorber 20; compressed air flows out of the outlet of the sprayer 10 and into the inlet of the oil separator 60, and then flows out of the outlet of the oil separator 60 and into the inlet of the swirl spray absorber 20; the oil separator 60 is used to remove oil from the compressed air. The compressed air produced by the compressor contains impurities such as oily substances, which mainly include large oil droplets, small oil droplets, and emulsified oil droplets. Large oil droplets can be removed by the sprayer 10, while small oil droplets and emulsified oil droplets can be removed by the existing oil separator 60.

[0050] Furthermore, the oil separator 60 uses a coalescer, also known as a coalescing separator.

[0051] Furthermore, in this embodiment of the compressed air purification system, a first separator 30 and an oil separator 60 are provided between the sprayer 10 and the swirl jet absorber 20. Compressed air flowing out of the outlet of the sprayer 10 enters the inlet of the first separator 30, and after flowing out of the outlet of the first separator 30, it enters the oil separator 60 through a first branch; after flowing out of the outlet of the oil separator 60, it enters the inlet of the swirl jet absorber 20. Since the inlet accuracy requirement of the oil separator is generally higher than that of a regular separator, the oil separator 60 is located after the first separator 30. In the absence of the first separator 30, the oil separator can also be used alone between the sprayer 10 and the swirl jet absorber 20.

[0052] Furthermore, a third valve 31 is provided on the first branch line, which is used to control the opening and closing of the first branch line; a fifth valve 33 is provided on the outlet pipe of the oil separator 60. The raw material gas is first separated by the first separator 30, and then oil is removed by the oil separator 60, resulting in better purification. By opening the third valve 31 and the fifth valve 33, the compressed air flowing out of the outlet of the first separator 30 is controlled to enter the oil separator 60 through the first branch line.

[0053] Furthermore, the outlet of the first separator 30 also includes a second branch, the other end of which is connected to the inlet of the swirl jet absorber 20. Compressed air flowing out from the second branch enters the inlet of the swirl jet absorber 20. Furthermore, the second branch has a fourth valve 32, which controls the opening and closing of the second branch. If the oily substances in the compressed air do not contain small oil droplets or emulsified oil droplets, then it is unnecessary to pass through the oil separator 60. In this case, the fourth valve 32 is opened, and the third valve 31 and the fifth valve 33 are closed. The compressed air flowing out from the outlet of the first separator 30 bypasses the oil separator 60 and directly enters the swirl jet absorber 20.

[0054] Furthermore, a slug trap 50 is installed before the inlet of the sprayer 10. The compressed air to be purified enters the inlet of the slug trap 50 and flows out from the outlet of the slug trap 50 before entering the inlet of the sprayer 10. When the raw material gas passes through the undulating pipeline, the free water it carries will accumulate at the bottom of the pipeline. After reaching a certain volume, slug flow will occur in the pipeline. Therefore, the raw material gas is first passed into the slug trap to receive any slug flow that may occur before the compressed air to be purified enters the purification process, and to separate the slug flow carried by the raw material gas. The function of the slug trap is to eliminate slug flow, provide stable delivery downstream, and also to initially separate some large oil particles in the raw material gas. Furthermore, the slug trap can be a container type or a pipeline type, selected according to the site conditions.

[0055] Furthermore, a second separator 40 is provided on the outlet side of the swirl jet absorber 20. Compressed air flowing out of the outlet of the swirl jet absorber 20 enters the inlet of the second separator 40 and flows out of the outlet of the second separator 40. The second separator 40 is used to dry the compressed air, ensuring that the product air is dry compressed air.

[0056] Furthermore, the second separator 40 can be either a cyclone separator or a vane separator, depending on the operating conditions. If the operating conditions of the compressed air are stable, such as stable flow rate and pressure, a cyclone separator is used; if the operating conditions of the compressed air have a large range of flexibility, a vane separator is used.

[0057] Furthermore, a pH detection device 22 is installed at the drain outlet of the rotary jet absorber 20. This device controls the opening and closing of the first valve 13 and the degree of opening of the second valve 12. The pH of the wastewater discharged from the rotary jet absorber 20 controls the opening and closing of the first valve 13 and the degree of opening of the second valve 12, 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 at the drain 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, meaning the working fluid of the rotary jet absorber 20 is the same as that of the sprayer 10, improving the controllability of the purification process. If the pH detection device 22 detects that the pH at the drain 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 adjusts the opening of the first valve 13 based on the detected acidity or alkalinity, thereby adjusting the component concentration of the working fluid in the second working fluid tank 21.

[0058] Furthermore, the outlet pipe of the second working fluid tank intersects and connects with the first bypass branch, and a sixth valve is installed at the outlet pipe of the second working fluid tank; the opening and closing of the first valve 13 and the opening degree of the second valve 12 are controlled by the pH detection device 22. The opening and closing of the first valve 13, the second valve 12, and the sixth valve 23 are controlled by the pH of the wastewater discharged from the vortex absorber 20, thereby controlling the acid / alkali concentration of the working fluid entering the vortex absorber 20. If the pH detection device 22 detects that the pH of the sewage outlet of the vortex 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 vortex absorber 20, that is, the working fluid of the vortex absorber 20 is the same as the working fluid of the sprayer 10, avoiding the reintroduction of alkali / acid solutions into the raw material gas. If the pH detection device 22 detects that the pH at the drain outlet of the rotary jet absorber 20 is acidic or alkaline, then the second valve 12 is closed, and the first valve 13, low-pressure pump 16, sixth valve 23 and second high-pressure pump 15 are opened. The pH detection device 22 detects the acidity or alkalinity and adjusts the opening of the first valve 13 and the sixth valve 23, as well as the outlet pressure of the low-pressure pump 16 and the second high-pressure pump 15, thereby adjusting the component concentration of the working liquid in the second working liquid tank 21.

[0059] Furthermore, a first high-pressure pump is installed on the pipeline between the first outlet of the first working fluid tank 11 and the inlet of the sprayer 10; and / or, a second high-pressure pump is installed on the first bypass branch; and / or, a low-pressure pump is installed on the pipeline between the second outlet of the first working fluid tank 11 and the inlet of the second working fluid tank 21. Since the raw material gas in the sprayer 10 and the swirl-jet absorber 20 is in a medium-to-high pressure state, high-pressure pumps are used as power transmission components on the pipeline between the first outlet of the first working fluid tank 11 and the inlet of the sprayer 10, as well as on the pipeline of the first bypass branch. Since the passage between the second outlet of the first working fluid tank 11 and the inlet of the second working fluid tank 21 is a liquid passage and does not involve compressed air, 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.

[0060] Furthermore, a first cooler 17 is provided between the first outlet of the first working fluid tank 11 and the inlet of the sprayer 10; and / or, a second cooler 24 is provided on the pipeline at the inlet of the swirl spray absorber 20. The first cooler 17 is used to cool the working fluid conveyed at the outlet of the first working fluid tank 11, and the second cooler 24 is used to cool the working fluid conveyed at the outlet of the second working fluid tank 21, so as to reduce the amount of gaseous water carried by the raw material gas. Both the first cooler 17 and the second cooler 24 can be heat exchangers, which have a cold source to cool the working fluid liquid. The cold source can be a water cooler or the like.

[0061] Furthermore, the sprayer 10, swirl absorber 20, first separator 30, second separator 40, and slug flow trap 50 in the compressed air purification system all have drain ports, and all of the above drain ports can be connected to the main drain pipe 70 through pipelines.

[0062] Furthermore, in addition to the first valve, second valve, third valve, fourth valve, fifth valve, and sixth valve, pumps, valves, temperature sensors, and pressure sensors can be installed in the compressed air purification system of this embodiment as needed, especially before and after the sprayer 10, swirl absorber 20, first separator 30, second separator 40, and slug flow trap 50. Those skilled in the art can install pumps, valves, temperature sensors, pressure sensors, and other sensors as needed for detection.

[0063] Furthermore, the equipment and pipelines in the aforementioned compressed air purification system are all medium- and high-pressure equipment.

[0064] Example 2:

[0065] This embodiment, based on Embodiment 1, contains compressed air with impurities including oil, solid substances, free water, and chemical impurities. The chemical impurities dissolve in the free water to form a chemical solution. When the temperature is below the freezing point, the free water and part of the chemical solution will freeze, while the remaining chemical solution exists in a liquid state. Since the freezing point of oil is higher than the freezing point, when the free water freezes into a solid, the oil will also solidify. Therefore, when the temperature is below the freezing point, the impurity-laden compressed air contains solid substances, solid ice, solid oil, and a liquid solution.

[0066] like Figure 2 and 3 As shown, this embodiment provides a compressed air purification system, and a first three-phase separator 80 is provided before 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.

[0067] like Figure 3 As shown, the tank of the first three-phase separator 80 has an air inlet 88, an air outlet 89, a first drain outlet 93, and a second drain outlet 92. Inside the tank, there is a weir plate 90, a liquid collection zone 97, and an ice collection zone 98. 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 88 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 zone 97 is located in the space below the windward side of the weir plate. The ice collection zone 98 is located in the space below the leeward side of the weir plate. The ice collection zone 98 has a heater 91 for heating the ice collection zone 98. The first drain outlet 93 of the first three-phase separator is located at the bottom of the liquid collection zone 97, and the second drain outlet 96 of the first three-phase separator is located at the bottom of the ice collection zone 98.

[0068] The compressed air to be purified enters the inlet 88 of the first three-phase separator. Solid substances, solid ice, solid oil, and liquid solutions in the compressed air enter the liquid collection zone. As the liquid level in the collection zone rises above the top of the weir plate, the solid oil, solid ice, and impurity ice, due to their low density, will overflow the weir plate and enter the ice collection zone. The bottom of the liquid collection zone has the first drain port 93 of the first three-phase separator, from which the denser solid substances and liquid phase are discharged. The ice collection zone has a heater 91, which heats the solid oil, solid ice, and impurity ice separated in the ice collection zone, causing them to liquefy and the oil to regain its fluidity, which is then discharged from the bottom of the ice collection zone through the second drain port 92 of the first three-phase separator.

[0069] Furthermore, the accompanying heater 91 can be located inside the ice collecting zone or on the outer wall of the ice collecting zone. A heating rod can be used as the accompanying heater inside the ice collecting zone, resulting in higher thermal efficiency; a heating strip can also be used on the outer wall of the ice collecting zone, resulting in a more uniform heating area. The inlet 88 of the first three-phase separator has an inlet valve 84, the outlet 89 has an outlet valve 82, the first drain 93 has a second drain valve 86, and the second drain 92 has a first drain valve 85.

[0070] In this embodiment, the second three-phase separator 81 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 repaired, the second three-phase separator is activated. The inlet pipe of the second separator 81 has an inlet valve 87. When the first three-phase separator needs to be switched or repaired, the inlet valve 84, outlet valve 82, first drain valve 85, and second drain valve 86 of the first three-phase separator are closed, while the inlet valve 87, outlet valve 94, first drain valve 95, and second drain valve 96 of the second three-phase separator are opened, allowing separation to be performed using the second three-phase separator. Alternatively, a third three-phase separator can be provided, connected in parallel with the first and second three-phase separators.

[0071] like Figure 2The 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 swirl-jet absorber 20. 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 swirl-jet absorber 20. The compressed air flowing out from the swirl-jet absorber 20 is the purified compressed air. A spraying device and a swirl-jet absorption device are provided. The spraying device includes a sprayer and a first working fluid tank. The swirl-jet absorption device includes a swirl-jet absorber and a second working fluid tank. The inlet of the sprayer is connected to the first outlet of the first working fluid tank via a pipeline. The second outlet of the first working fluid tank is connected to the inlet of the second working fluid tank. The outlet of the second working fluid tank is connected to the inlet of the swirl-jet absorber via a first bypass branch. A first valve is provided on the pipeline between the second outlet of the first working fluid tank and the inlet of the second working fluid tank. A second valve is provided on the first bypass branch.

[0072] Furthermore, a first separator is provided between the sprayer and the swirl jet absorber; compressed air flows out from the outlet of the sprayer and into the inlet of the first separator, and then flows out from the outlet of the first separator and into the inlet of the swirl jet absorber; the first separator is used to dry the compressed air.

[0073] Furthermore, a second separator is provided on the outlet side of the swirl jet absorber. Compressed air flowing out from the outlet of the swirl jet absorber enters the inlet of the second separator and flows out from the outlet of the second separator.

[0074] As described above, a first valve 13 is provided on the pipeline between the second outlet of the first working fluid tank and the 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 outlet of the second working fluid tank and the inlet of the swirl jet absorber. The outlet of the second working fluid tank also has a sixth valve 23, and the outlet of the sixth valve 23 is connected to the inlet of the second high-pressure pump 15.

[0075] Furthermore, a pH detection device 22 is installed at the discharge port of the rotary jet absorber 20. This device controls the opening and closing of the first valve 13, the second valve 12, and the sixth valve 23, as well as their respective opening degrees. The pH of the wastewater discharged from the rotary jet absorber 20 controls the opening and closing 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 at the discharge port 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, while 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, meaning the working fluid of the rotary jet absorber 20 is the same as that of the sprayer 10, preventing the introduction of alkali / acid solutions into the raw material gas. If the pH detection device 22 detects that the pH at the drain outlet of the rotary jet absorber 20 is acidic or alkaline, then the second valve 12 is closed, and the first valve 13, low-pressure pump 16, sixth valve 23 and second high-pressure pump 15 are opened. The pH detection device 22 detects the acidity or alkalinity and adjusts the opening of the first valve 13 and the sixth valve 23, as well as the outlet pressure of the low-pressure pump 16 and the second high-pressure pump 15, thereby adjusting the component concentration of the working liquid in the second working liquid tank 21.

[0076] Furthermore, a first high-pressure pump 14 is installed on the pipeline between the first outlet of the first working fluid tank 11 and the inlet of the sprayer 10; and / or, a second high-pressure pump 15 is installed on the first bypass branch; and / or, a low-pressure pump 16 is installed on the pipeline between the second outlet of the first working fluid tank 11 and the inlet of the second working fluid tank 21. Since the raw material gas in the sprayer 10 and the swirl-jet absorber 20 is in a medium-high pressure state, high-pressure pumps are used as power transmission components on the pipeline between the first outlet of the first working fluid tank 11 and the inlet of the sprayer 10, as well as on the pipeline of the first bypass branch. Since the passage between the second outlet of the first working fluid tank 11 and the inlet of the second working fluid tank 21 is a liquid passage and does not involve compressed air, 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.

[0077] Furthermore, a first cooler 17 is provided between the first outlet of the first working fluid tank 11 and the inlet of the sprayer 10; and / or, a second cooler 24 is provided on the pipeline at the inlet of the swirl spray absorber 20. The first cooler 17 is used to cool the working fluid conveyed at the outlet of the first working fluid tank 11, and the second cooler 24 is used to cool the working fluid conveyed at the outlet of the second working fluid tank 21, so as to reduce the amount of gaseous water carried by the raw material gas. Both the first cooler 17 and the second cooler 24 can be heat exchangers, which have a cold source to cool the working fluid liquid. The cold source can be a water cooler or the like.

[0078] Furthermore, the equipment and pipelines in the aforementioned compressed air purification system are all medium- and high-pressure equipment.

[0079] The compressed air purification system implemented here is suitable for operating conditions where the raw gas temperature is below freezing. It can simultaneously remove solid substances, solid ice, solid oils, solid impurities, and liquid impurity solutions carried by the compressed air. Furthermore, it can adapt the required purification working fluid according to the composition of the chemical impurities, offering advantages such as a wide purification range, broad applicability, and high controllability.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A compressed air purification system, characterized in that, It includes a spraying device and a swirl-jet absorption device. The spraying device includes a sprayer and a first working fluid tank. The swirl-jet absorption device includes a swirl-jet absorber and a second working fluid tank. The inlet of the sprayer is connected to the first outlet of the first working fluid tank via a pipeline; the second outlet of the first working fluid tank is connected to the inlet of the second working fluid tank; the outlet of the second working fluid tank is connected to the inlet of the rotary jet absorber via a pipeline; the second outlet of the first working fluid tank is also connected to the inlet of the rotary jet absorber via a first bypass branch via a pipeline; a first valve is provided on the pipeline between the second outlet of the first working fluid tank and the 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 then enters the air inlet of the swirl spray absorber. A first separator is also provided between the sprayer and the swirl spray absorber; Compressed air flows out of the outlet of the sprayer and into the inlet of the first separator, and then flows out of the outlet of the first separator and into the inlet of the swirl spray absorber. The first separator is used to dry compressed air; An oil separator is also 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 separator through a first branch, and the air outlet of the oil separator 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 separator. The decision to open the first valve or the second valve depends on the chemical impurities dissolved in the free water in the compressed air. 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, then the second valve is opened and the first valve is closed. If it is necessary to absorb impurities in the compressed air entering the rotary jet absorber with a mixture of the working fluid in the first working fluid tank and the working fluid in the second working fluid tank, then the first valve is opened and the second valve is closed.

2. The compressed air purification system according to claim 1, characterized in that, The first separator also includes a second branch at its outlet. One end of the second branch is connected to the outlet of the first separator, and the other end of the second branch is connected to the outlet pipe of the fifth valve. Compressed air flowing out from the second branch enters the inlet of the swirl jet absorber. A fourth valve is provided on the second branch.

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

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

5. The compressed air purification system according to claim 1, characterized in that, The first working fluid tank contains water, alkali, or acid, and the second working fluid tank contains alkali or acid.

6. The compressed air purification system according to claim 1 or 4, 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.

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

8. The compressed air purification system according to claim 1, characterized in that, A first high-pressure pump is also 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 inlet of the rotary jet absorber, the outlet of the second high-pressure pump is connected to the inlet of the rotary jet absorber, a sixth valve is provided at the outlet pipeline of the second working fluid tank, the inlet of the sixth valve is connected to the 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 outlet of the first working fluid tank and the inlet of the second working fluid tank.

9. The compressed air purification system according to claim 8, characterized in that, A pH detection device is installed at the drain outlet of the rotary jet absorber; The first valve and the sixth valve are opened and the second valve is closed by controlling the pH detection device; or the second valve is opened and the first valve and the sixth valve are closed by controlling the pH detection device. And / or, the outlet pressure of the low-pressure pump and the second high-pressure pump can be controlled by the pH detection device.

10. The compressed air purification system according to claim 1, characterized in that, The oil separator uses an oil coalescer.

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

12. The compressed air purification system according to claim 11, characterized in that, The first three-phase separator includes a weir plate, a liquid collection zone, and an ice collection zone; 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 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, which is used to heat the ice collection area. The first drain outlet of the first three-phase separator is located at the bottom of the liquid collection zone, and the second drain outlet of the first three-phase separator is located at the bottom of the ice collection zone.

13. The compressed air purification system according to claim 11, characterized in that, A second three-phase separator is also 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 inlet of the first three-phase separator, flows out from the outlet of the first three-phase separator, and then enters the inlet of the sprayer; or, the compressed air to be purified enters the inlet of the second three-phase separator, flows out from the outlet of the second three-phase separator, and then enters the inlet of the sprayer.

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