VOCs-containing waste gas treatment method and device

Abstract

The invention discloses a VOCs-containing waste gas treatment method and device, and relates to the technical field of waste gas treatment.The VOCs-containing waste gas treatment method comprises the following steps that VOCs-containing waste gas is compressed, and compressed waste gas is obtained; atomizing the bacterial liquid capable of adsorbing VOCs by using compressed waste gas, settling, separating and filtering to obtain treated waste gas; wherein the pressure of the compressed waste gas is greater than the standard atmospheric pressure. Waste gas containing VOCs is compressed, so that the pressure of the compressed waste gas is larger than the standard atmospheric pressure, the content of the VOCs in unit volume of waste can be concentrated, the volume of the waste gas is reduced, then bacteria liquid capable of adsorbing the VOCs is atomized through the compressed waste gas, more VOCs in fine fog drops in the compressed waste gas are in full contact with strains in the bacteria liquid capable of adsorbing the VOCs, and the VOCs in the bacteria liquid capable of adsorbing the VOCs are removed. The concentration of reactants is improved, so that the reaction rate of strains and VOCs is improved, more VOCs are adsorbed and decomposed by the strains in the bacterial liquid within a certain reaction time, and the treatment efficiency of waste gas containing VOCs is improved.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a method and device for treating waste gas containing VOCs. Background Art

[0002] Automobile painting is the main link in the production of VOCs (volatile organic compounds). The main materials such as paint and sealant used in painting will evaporate a large amount of VOCs during the operation and drying and curing process, and the direct emission of their exhaust gas will pollute the environment.

[0003] There are many methods for treating VOCs waste gas, such as combustion and adsorption. The VOCs-containing waste gas is concentrated and adsorbed by transporting porous zeolite or molecular sieves, and then the VOCs in the waste gas are decomposed into carbon dioxide and water through combustion or catalytic decomposition, and finally discharged.

[0004] These VOCs waste gas treatment methods require additional heat sources, further consume energy, and are prone to produce secondary pollutants, which is not conducive to reducing costs and also poses certain risks. Summary of the invention

[0005] The present application provides a method and device for treating waste gas containing VOCs to solve the existing problems of high energy consumption and high risk.

[0006] In a first aspect, the present application provides a method for treating waste gas containing VOCs, comprising the following steps:

[0007] Compressing the waste gas containing VOCs to obtain compressed waste gas;

[0008] Atomize the bacterial solution capable of absorbing VOCs with compressed waste gas to obtain a mixed aerosol;

[0009] The mixed gas mist is settled, separated and filtered to obtain the treated waste gas;

[0010] Wherein, the pressure of the compressed exhaust gas is greater than the standard atmospheric pressure.

[0011] The present application compresses the waste gas containing VOCs so that the pressure of the compressed waste gas is greater than the standard atmospheric pressure, which can concentrate the content of VOCs in the waste per unit volume and reduce the volume of the waste gas. Then, the bacterial solution that can absorb VOCs is atomized by the compressed waste gas, so that in the fine droplets, more VOCs in the compressed waste gas are fully in contact with the strains in the bacterial solution that can absorb VOCs, thereby increasing the concentration of the reactants and thus increasing the reaction rate of the strains and VOCs, so that within a certain reaction time, more VOCs are adsorbed and decomposed by the strains in the bacterial solution, thereby improving the treatment efficiency of the waste gas containing VOCs. At the same time, since the waste gas containing VOCs is compressed into compressed waste gas, the bacterial solution that can absorb VOCs is driven to atomize, and the pressure of the compressed waste gas can drive the movement of the droplets, which reduces additional energy consumption, and the treatment product is carbon dioxide, which has little pollution to the environment. The treated waste gas can be separated from the bacterial solution by sedimentation, separation and filtration, the bacterial solution can be recycled and reused, and the waste gas can be further used as compressed air.

[0012] It should be noted that the strains in the bacterial solution capable of adsorbing VOCs are mainly strains separated from VOCs wastewater, including but not limited to yeast, bacillus and thermophilic bacteria.

[0013] In some embodiments, the active gas partial pressure coefficient in the VOCs-containing waste gas is δ, the standard atmospheric pressure is P0, the pressure of the compressed waste gas is P1, the active gas partial pressure in the VOCs-containing waste gas is P2, the active gas in the VOCs-containing waste gas inhibits the activity of the strain in the bacterial solution that can adsorb VOCs is P3, and the active gas includes oxygen and / or carbon dioxide, satisfying:

[0014] δP1<P3;

[0015] δ=P2 / P0.

[0016] The gases in the waste gas of VOCs that inhibit the strains of the bacterial solution are oxygen and / or carbon dioxide. When the pressure of oxygen and carbon dioxide is too high, it will inhibit the activity of the strains and affect the decomposition of VOCs by the strains. Therefore, in the compressed gas, the partial pressure of the active gas needs to be less than the inhibitory pressure of the active gas on the activity of the strains. While improving the decomposition of VOCs by the strains, it can reduce the inhibition of the active gas on the strains in the compressed waste gas after compression. Usually, the active gas partial pressure coefficient is 0 to 1. P0 is a standard atmospheric pressure. P2 can be measured in the waste gas containing VOCs.

[0017] In some embodiments, the pressure of the compressed exhaust gas is P1, 150kPa≤P1≤1500kPa. Compressed exhaust gas in the range of 1.5 to 15 atmospheres can reduce the flow rate of exhaust gas treatment, reduce the volume of treatment equipment, concentrate the content of VOCs, improve the reaction efficiency of VOCs and strains, improve the efficiency of exhaust gas treatment, and at the same time adapt to the pressure bearing capacity of compressors and pipelines. Preferably, 200kPa≤P1≤500kPa, and the compressed exhaust gas in this range has the best compression efficiency for VOCs and is most suitable for the requirements of pipelines and compressors.

[0018] In some embodiments, the flow rate of the bacterial solution capable of adsorbing VOCs is V1, the flow rate of the compressed exhaust gas is V2, the solubility of the bacterial solution capable of adsorbing VOCs to VOCs is m, the pressure of the sedimentation chamber during sedimentation is P4, the standard atmospheric pressure is P0, the contact efficiency between the compressed exhaust gas and the bacterial solution capable of adsorbing VOCs is θ, the contact time between the compressed exhaust gas and the bacterial solution capable of adsorbing VOCs is t, and the adsorption efficiency of the bacterial solution capable of adsorbing VOCs to VOCs is:

[0019] R=θV1·m·t / (V2·C·P4 / P0).

[0020] Usually, by using an excessive amount of strains, the VOCs in the waste gas of VOCs can be more completely decomposed by the strains, thereby achieving the treatment of VOCs in the waste gas, making the content of VOCs in the waste gas after decomposition and separation as small as possible, and improving the treatment effect of VOCs in the waste gas of VOCs. The solubility m of the bacterial solution that can adsorb VOCs to VOCs can be calculated experimentally, and the contact efficiency θ between the compressed waste gas and the bacterial solution that can adsorb VOCs can be calculated experimentally. The flow rate V1 of the bacterial solution that can adsorb VOCs can be set manually as needed, the flow rate V2 of the compressed waste gas can be set manually as needed, the pressure P4 of the sedimentation chamber during sedimentation can be set manually as needed, and the contact time between the compressed waste gas and the bacterial solution that can adsorb VOCs can be set manually as needed.

[0021] In some embodiments, the flow rate of the bacterial solution capable of absorbing VOCs is V1, 100m 3 / h≤V1≤1000m 3 When the flow rate of the bacterial solution capable of absorbing VOCs is within this range, the atomization effect can be improved, so that the contact efficiency between the bacterial solution and VOCs is higher, and the decomposition efficiency of VOCs is improved.

[0022] In some embodiments, the flow rate of the compressed exhaust gas is V2,4000m 3 / h≤V2≤300000m 3 / h. When the flow rate of the compressed exhaust gas is within this range, the contact efficiency between VOCs and the strain can be higher, and the droplets of the atomized strain can be smaller. At the same time, the flow rate of the droplets is appropriate, and the residence time in the sedimentation chamber is sufficient, so that the contact time and amount of VOCs and the strain are sufficient, thereby improving the decomposition efficiency of VOCs.

[0023] In some embodiments, the contact time between the compressed exhaust gas and the bacterial solution capable of absorbing VOCs is t, 1s≤t≤15s. The contact time between the compressed exhaust gas and the bacterial solution capable of absorbing VOCs directly affects the absorption amount of VOCs by the strain. When the contact time is within this range, the sprayed bacterial solution is driven by the compressed gas to flow continuously in the pipe and container, which can improve the treatment effect of the strain on VOCs while reducing the volume of the pipe and container.

[0024] In some embodiments, the pressure of the sedimentation chamber during sedimentation is P4, 120kPa≤P4≤700kPa. The pressure difference of the sedimentation chamber affects the movement rate of the atomized bacterial liquid. The exhaust pressure can be set according to the pressure difference requirement to control the total amount of gas output. Within this range, the movement rate of the atomized bacterial liquid can be moderate, the bacterial liquid has sufficient contact time with VOCs, and the decomposition effect of the bacterial liquid on VOCs is improved.

[0025] In some embodiments, the strain concentration in the bacterial solution capable of adsorbing VOCs is C, 1000TPU≤C≤20000TPU. The strain concentration in the bacterial solution capable of adsorbing VOCs affects the adsorption amount of VOCs. Within this range, sufficient strains can be in contact with VOCs, thereby increasing the adsorption rate of VOCs, while keeping the strain concentration within an appropriate range, reducing competitive inhibition between strains, and reducing the reduction in strain activity.

[0026] In a second aspect, the present application provides a waste gas treatment device containing VOCs, comprising:

[0027] A compression system for compressing the exhaust gas containing VOCs into compressed exhaust gas;

[0028] The spray system includes a liquid pipeline for circulating a bacterial liquid capable of absorbing VOCs and at least one gas pipeline for circulating a compressed waste gas, wherein an outlet of the gas pipeline is arranged at an angle to an outlet of the liquid pipeline, wherein the compressed waste gas at the outlet of the gas pipeline can atomize the bacterial liquid at the outlet of the liquid pipeline;

[0029] Sedimentation system, used to settle the bacterial solution that can absorb VOCs after being atomized by compressed exhaust gas;

[0030] A separation system for separating gas and liquid in the atomized bacterial solution capable of absorbing VOCs; and

[0031] Filtration system.

[0032] Usually, the gas pipeline is set as a high-pressure resistant gas nozzle to spray the compressed waste gas from the gas pipeline. The outlet of the liquid pipeline is a nozzle for the bacterial liquid to flow out. Since the outlet of the gas pipeline and the outlet of the liquid pipeline are set at an angle, when the compressed waste gas is sprayed from the gas nozzle, it just sprays on the outflowing bacterial liquid, and then under the pressure of the compressed gas, the bacterial liquid is atomized into small droplets, thereby improving the contact efficiency between the strain and VOCs, and improving the treatment effect of VOCs in the waste gas. After sedimentation, separation and filtration, the bacterial liquid and the waste gas adsorbed by VOCs can be separated, thereby realizing the biological treatment of waste gas containing VOCs. In the entire VOCs-containing waste gas treatment device, the compression system can be used to convert the waste gas into high-pressure gas, so that the wind of the entire equipment is self-driven by the high-pressure gas, without the need for additional power, the overall equipment has no secondary power consumption, and the pressurized clean exhaust gas can be used as power gas to reduce energy waste. Compressed waste gas is a high-pressure gas that can reduce the overall air volume of the equipment, making the main volume of the equipment doubled compared with the traditional solution, and reducing the footprint of the device.

[0033] It should be noted that the wind direction of the entire VOCs-containing waste gas treatment device can be to compress the waste gas self-sedimentation system to atomize the bacteria liquid at the top, and rely on the pressure of the compressed waste gas to drive the atomized bacteria liquid beads to float and settle in the sedimentation system. At the bottom of the sedimentation system, the atomized bacteria liquid beads enter the separation system through the pipeline from the air outlet. After centrifugal separation, the bacteria liquid falls back to the bottom of the centrifugal separation system under the action of gravity, and is recycled and reused from the reflux tank at the bottom. The separated gas moves to the air outlet at the top of the separation system under the push of pressure, thereby realizing gas-liquid separation. The gas flowing out of the separation system enters the filtration system for filtration to obtain the treated waste gas. The treated waste gas still has some pressure and can be used as compressed air.

[0034] It should be noted that before the compression system compresses the VOCs-containing waste gas into compressed waste gas, the VOCs-containing waste gas can also be filtered as needed to remove large particles and improve the effect of VOCs treatment.

[0035] It should be noted that in order to ensure the atomization separation effect, the bacterial liquid is usually sprayed at the top of the sedimentation system. The bacterial liquid is atomized into fine droplets under the action of the atomizer, drifting and settling along the overall pipeline, and an outlet pipeline is set at the bottom of the sedimentation system to connect to the separation system for gas-liquid separation. The time it takes for the bacterial bead droplets to travel from the top of the sedimentation system to the separation system is the adsorption treatment time of the strain on VOCs.

[0036] It should be noted that the filtration system is usually configured with multiple layers of filter plates. From the air inlet to the air outlet, the filtrate plate, the filter membrane containing the adsorbent and the waterproof and breathable semipermeable membrane are sequentially arranged at intervals. The filtrate plate can isolate the unseparated part of the liquid water. The filter membrane containing the adsorbent is composed of a porous structure of zeolite or activated carbon, which can adsorb some of the small molecules involved in VOCs. The waterproof and breathable semipermeable membrane can isolate water molecules and allow air or other small molecules to pass through, and is generally composed of PTFE. The top of the filtration system is a sealing structure, and a liquid reflux groove is provided at the bottom of the filtration system, which flows from the direction of the air outlet to the direction of the air inlet, wherein the reflux groove is a one-way check setting in the flow direction, that is, the recovered water can only flow from the air outlet to the air inlet, and cannot flow back.

[0037] In some embodiments, the angle between the outlet of the gas pipeline and the outlet of the liquid pipeline is 30 to 60 degrees. When the angle between the outlet of the gas pipeline and the outlet of the liquid pipeline is within this range, the angle and strength of the compressed exhaust gas ejected from the gas outlet to be ejected on the bacterial liquid flowing out of the liquid pipeline outlet can be better, thereby improving the atomization effect, reducing the waste of compressed exhaust gas and bacterial liquid, and improving the adsorption treatment effect of the bacterial liquid on VOCs in the compressed exhaust gas.

[0038] In some embodiments, the spray system includes a liquid pipeline and two gas pipelines, wherein the liquid pipeline is located between the two gas pipelines. By arranging the two gas pipelines on both sides of the liquid pipeline, the bacterial liquid can be sprayed into droplets by the compressed exhaust gas on both sides, thereby improving the spray effect, improving the contact efficiency between the strain and VOCs, and further improving the decomposition efficiency of the strain on VOCs.

[0039] In some embodiments, the separation system includes a separation chamber and a plurality of spoilers extending radially along the separation chamber, wherein the plurality of spoilers are arranged at intervals along the circumference of the separation chamber. The plurality of spoilers constitute turbine blades, and the aerosol droplets entering the separation system are separated from the gas and liquid under the action of gravity and centrifugal force through the spoiled flow of the turbine blades, thereby realizing the recovery of bacterial liquid and the treatment of VOCs waste gas.

[0040] In some embodiments, in order to improve the spoiler effect and the effect of blocking the bacterial liquid, the angle between adjacent spoilers is 10 to 45 degrees. By setting the spoilers at an angle, the spoiler effect can be improved while providing a channel for the gas. It should be noted that there is a projected overlapping part between the spoilers to increase the isolation and separation effect on the bacterial liquid.

[0041] In some embodiments, the separation system includes a separation chamber and an inlet and an outlet located at two ends of the separation chamber in a radial direction, wherein the angle between the inlet and the outlet is 90 to 120°. When the angle between the inlet and the outlet is within this range, the amount of bacterial liquid carried out can be reduced, while the turbulence effect is improved, so that the gas can flow out from the outlet more easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 This is a schematic structural diagram of a waste gas treatment device containing VOCs according to an embodiment of the present application.

[0044] Figure 2 This is a schematic diagram of the nozzle position structure of the spray system of a VOCs-containing waste gas treatment device according to one embodiment of the present application.

[0045] Figure 3 This is a schematic structural diagram of a separation system of a waste gas treatment device containing VOCs according to an embodiment of the present application.

[0046] Figure 4 This is a schematic diagram of the structure of the separation chamber and spoiler of a waste gas treatment device containing VOCs in one embodiment of the present application.

[0047] Figure 5 This is a schematic diagram of the internal structure of the filtration system of a waste gas treatment device containing VOCs according to an embodiment of the present application.

[0048] Description of Figure Numbers:

[0049] 100 Waste gas treatment device containing VOCs; 1 compression system; 2 spray system; 21 liquid pipeline; 22 gas pipeline; 3 sedimentation system; 4 separation system; 41 separation chamber; 42 spoiler; 43 inlet; 44 outlet; 5 filtration system; 51 filtrate plate; 52 filter membrane; 53 waterproof and breathable semipermeable membrane; 54 reflux tank. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0051] Automobile painting is the main link in the production of VOCs (volatile organic compounds). The main materials such as paint and sealant used in painting will evaporate a large amount of VOCs during the operation and drying and curing process, and the direct emission of their exhaust gas will pollute the environment.

[0052] There are many methods for treating VOCs waste gas, such as combustion and adsorption. The VOCs-containing waste gas is concentrated and adsorbed by transporting porous zeolite or molecular sieves, and then the VOCs in the waste gas are decomposed into carbon dioxide and water through combustion or catalytic decomposition, and finally discharged.

[0053] These VOCs waste gas treatment methods require additional heat sources, further consume energy, and are prone to produce secondary pollutants, which is not conducive to reducing costs and also poses certain risks.

[0054] Therefore, there are endless studies on pollution-free VOCs waste gas treatment methods. For example, a biological method for treating VOCs waste gas is to spray VOCs-containing waste gas with a surfactant liquid carrying microorganisms. After the VOCs substances are dissolved in water, they are captured by high-concentration biological bacteria liquid and decomposed into carbon dioxide, water and other metabolites. This solution does not rely on natural gas for combustion and decomposition, which can greatly reduce carbon emissions. At the same time, low-temperature operations will not produce secondary dioxin pollution. However, this method cannot handle large air volumes of VOCs waste gas. The negative pressure fan is wind-powered, and the exhaust of the entire system needs to go through multiple filtrations, resulting in large pressure losses and high energy consumption. The electric energy has no advantage over traditional solutions, and the contact efficiency between the waste gas and the bacteria liquid is not high, so the treatment results cannot meet the requirements.

[0055] In view of this, the present application provides a method and device for treating waste gas containing VOCs to solve the existing problems of high energy consumption and high risk.

[0056] In a first aspect, the present application provides a method for treating waste gas containing VOCs, comprising the following steps:

[0057] Compressing the waste gas containing VOCs to obtain compressed waste gas;

[0058] Use compressed waste gas to atomize bacterial solution that can absorb VOCs, settle, separate, and filter to treat the waste gas;

[0059] Wherein, the pressure of the compressed exhaust gas is greater than the standard atmospheric pressure.

[0060] The present application compresses the waste gas containing VOCs so that the pressure of the compressed waste gas is greater than the standard atmospheric pressure, which can concentrate the content of VOCs in the waste per unit volume and reduce the volume of the waste gas. Then, the bacterial solution that can absorb VOCs is atomized by the compressed waste gas, so that in the fine droplets, more VOCs in the compressed waste gas are fully in contact with the strains in the bacterial solution that can absorb VOCs, thereby increasing the concentration of the reactants and thus increasing the reaction rate of the strains and VOCs, so that within a certain reaction time, more VOCs are adsorbed and decomposed by the strains in the bacterial solution, thereby improving the treatment efficiency of the waste gas containing VOCs. At the same time, since the waste gas containing VOCs is compressed into compressed waste gas, the bacterial solution that can absorb VOCs is driven to atomize, and the pressure of the compressed waste gas can drive the movement of the droplets, which reduces additional energy consumption, and the treatment product is carbon dioxide, which has little pollution to the environment. The treated waste gas can be separated from the bacterial solution by sedimentation, separation and filtration, the bacterial solution can be recycled and reused, and the waste gas can be further used as compressed air.

[0061] It should be noted that the strains in the bacterial solution capable of adsorbing VOCs are mainly strains separated from VOCs wastewater, including but not limited to yeast, bacillus and thermophilic bacteria.

[0062] In combination with the first aspect, in some embodiments provided in the present application, the active gas partial pressure coefficient in the VOCs-containing waste gas is δ, the standard atmospheric pressure is P0, the pressure of the compressed waste gas is P1, the active gas partial pressure in the VOCs-containing waste gas is P2, the active gas in the VOCs-containing waste gas inhibits the activity of the strain in the bacterial solution that can adsorb VOCs is P3, and the active gas includes oxygen and / or carbon dioxide, satisfying:

[0063] δP1<P3;

[0064] δ=P2 / P0.

[0065] The gases in the waste gas of VOCs that inhibit the strains of the bacterial solution are oxygen and / or carbon dioxide. When the pressure of oxygen and carbon dioxide is too high, it will inhibit the activity of the strains and affect the decomposition of VOCs by the strains. Therefore, in the compressed gas, the partial pressure of the active gas needs to be less than the inhibitory pressure of the active gas on the activity of the strains. While improving the decomposition of VOCs by the strains, it can reduce the inhibition of the active gas on the strains in the compressed waste gas after compression. Usually, the active gas partial pressure coefficient is 0 to 1. P0 is a standard atmospheric pressure. P2 can be measured in the waste gas containing VOCs. Usually P2 can be measured in the waste gas containing VOCs.

[0066] It should be noted that the oxygen partial pressure in high-pressure compressed exhaust gas is higher, which can support a higher scalar aerobic bacteria concentration, enhance the activity of aerobic bacteria, and inhibit anaerobic bacteria contamination.

[0067] In combination with the first aspect, in some embodiments provided in the present application, the pressure of the compressed exhaust gas is P1, 150kPa≤P1≤1500kPa. Compressed exhaust gas in the range of 1.5 to 15 atmospheres can reduce the flow rate of exhaust gas treatment, reduce the volume of treatment equipment, concentrate the content of VOCs, improve the reaction efficiency of VOCs and strains, improve the efficiency of exhaust gas treatment, and at the same time adapt to the pressure bearing capacity of compressors and pipelines. Preferably, 200kPa≤P1≤500kPa, and the compressed exhaust gas in this range has the best compression efficiency for VOCs and is most suitable for the requirements of pipelines and compressors.

[0068] In combination with the first aspect, in some embodiments provided in the present application, the flow rate of the bacterial solution capable of adsorbing VOCs is V1, the flow rate of the compressed exhaust gas is V2, the solubility of the bacterial solution capable of adsorbing VOCs to VOCs is m, the pressure of the sedimentation chamber during sedimentation is P4, the standard atmospheric pressure is P0, the contact efficiency of the compressed exhaust gas with the bacterial solution capable of adsorbing VOCs is θ, the contact time of the compressed exhaust gas with the bacterial solution capable of adsorbing VOCs is t, and the adsorption efficiency of the bacterial solution capable of adsorbing VOCs to VOCs is:

[0069] R=θV1·m·t / (V2·C·P4 / P0).

[0070] Usually, by using an excessive amount of strains, the VOCs in the waste gas of VOCs can be more completely decomposed by the strains, thereby achieving the treatment of VOCs in the waste gas, making the content of VOCs in the waste gas after decomposition and separation as small as possible, and improving the treatment effect of VOCs in the waste gas of VOCs. The solubility m of the bacterial solution that can adsorb VOCs to VOCs can be calculated by experiments, and the contact efficiency θ between the compressed waste gas and the bacterial solution that can adsorb VOCs can be calculated by experiments. The flow rate V1 of the bacterial solution that can adsorb VOCs can be set manually as needed, the flow rate V2 of the compressed waste gas can be set manually as needed, the content X of VOCs in the waste gas containing VOCs can be measured, the pressure P4 of the sedimentation chamber during sedimentation can be set manually as needed, and the contact time between the compressed waste gas and the bacterial solution that can adsorb VOCs can be set manually as needed.

[0071] In combination with the first aspect, in some embodiments provided in the present application, the flow rate of the bacterial solution capable of absorbing VOCs is V1, 100m 3 / h≤V1≤1000m 3 When the flow rate of the bacterial solution capable of absorbing VOCs is within this range, the atomization effect can be improved, so that the contact efficiency between the bacterial solution and VOCs is higher, and the decomposition efficiency of VOCs is improved.

[0072] In combination with the first aspect, in some embodiments provided in the present application, the flow rate of the compressed exhaust gas is V2,4000m 3 / h≤V2≤300000m 3 / h. When the flow rate of the compressed exhaust gas is within this range, the contact efficiency between VOCs and the strain can be higher, and the droplets of the atomized strain can be smaller. At the same time, the flow rate of the droplets is appropriate, and the residence time in the sedimentation chamber is sufficient, so that the contact time and amount of VOCs and the strain are sufficient, thereby improving the decomposition efficiency of VOCs.

[0073] In combination with the first aspect, in some embodiments provided in the present application, the contact time between the compressed exhaust gas and the bacterial solution capable of absorbing VOCs is t, 1s≤t≤15s. The contact time between the compressed exhaust gas and the bacterial solution capable of absorbing VOCs directly affects the absorption amount of VOCs by the strain. When the contact time is within this range, since the sprayed bacterial solution is driven by the compressed gas and flows continuously in the pipe and container, the volume of the pipe and container can be reduced while improving the treatment effect of the strain on VOCs.

[0074] In combination with the first aspect, in some embodiments provided in the present application, the pressure of the sedimentation chamber during sedimentation is P4, 120kPa≤P4≤700kPa. The pressure difference of the sedimentation chamber affects the movement rate of the atomized bacterial liquid. The exhaust pressure can be set according to the pressure difference requirement to control the total amount of gas output. Within this range, the movement rate of the atomized bacterial liquid can be moderate, the bacterial liquid has sufficient contact time with VOCs, and the decomposition effect of the bacterial liquid on VOCs is improved.

[0075] In combination with the first aspect, in some embodiments provided in the present application, the strain concentration in the bacterial solution capable of adsorbing VOCs is C, 1000TPU≤C≤20000TPU. The strain concentration in the bacterial solution capable of adsorbing VOCs affects the adsorption amount of VOCs. Within this range, sufficient strains can be in contact with VOCs, thereby increasing the adsorption rate of VOCs, while keeping the strain concentration within an appropriate range, reducing competitive inhibition between strains, and reducing the reduction in strain activity.

[0076] Second, as Figure 1As shown, the present application provides a waste gas treatment device 100 containing VOCs, comprising a compression system 1, a spray system 2, a sedimentation system 3, a separation system 4 and a filtration system 5 which are sequentially connected by pipelines, wherein the compression system 1 is used to compress the waste gas containing VOCs into compressed waste gas; the spray system 2 comprises a liquid pipeline 21 for circulating a bacterial liquid capable of absorbing VOCs and at least one gas pipeline 22 for circulating the compressed waste gas, wherein the outlet of the gas pipeline 22 is arranged at an angle to the outlet of the liquid pipeline 21, wherein the compressed waste gas at the outlet of the gas pipeline 22 can atomize the bacterial liquid at the outlet of the liquid pipeline 21; the sedimentation system 3 is used to precipitate the bacterial liquid capable of absorbing VOCs atomized by the compressed waste gas; the separation system 4 is used to separate the gas and liquid in the atomized bacterial liquid capable of absorbing VOCs.

[0077] like Figure 2 As shown, the gas pipeline 22 is usually configured as a high-pressure resistant gas nozzle to eject the compressed waste gas from the gas pipeline 22, and the outlet of the liquid pipeline 21 is a nozzle for the bacterial liquid to flow out. Since the outlet of the gas pipeline 22 and the outlet of the liquid pipeline 21 are arranged at an angle, when the compressed waste gas is ejected from the gas nozzle, it just sprays on the outflowing bacterial liquid, and then under the pressure of the compressed gas, the bacterial liquid is atomized into small droplets, thereby improving the contact efficiency between the strain and VOCs, and improving the treatment effect of VOCs in the waste gas. After sedimentation, separation and filtration, the bacterial liquid and the waste gas after VOCs adsorption can be separated, thereby realizing the biological treatment of the waste gas containing VOCs. In the entire VOCs-containing waste gas treatment device 100, the compression system 1 can be used to convert the waste gas into high-pressure gas, so that the wind of the entire device is self-driven by the high-pressure gas, no additional power is required, the overall device has no secondary power consumption, and the pressurized clean exhaust gas can be used as power gas to reduce energy waste. Compressed exhaust gas is a high-pressure gas that can reduce the overall air volume of the equipment, making the main volume of the equipment several times smaller than that of traditional solutions, reducing the footprint of the device.

[0078] It should be noted that the air path direction of the entire VOCs-containing waste gas treatment device 100 can be that the compressed waste gas atomizes the bacterial liquid at the top of the self-settling system 3, and relies on the pressure of the compressed waste gas to drive the atomized bacterial liquid beads to float and settle in the sedimentation system 3. At the bottom of the sedimentation system 3, the atomized bacterial liquid beads enter the separation system 4 through the pipeline from the air outlet. The centrifugal separation system 4 is centrifuged, so that the bacterial liquid falls back to the bottom of the centrifugal separation system 4 under the action of gravity, and is recycled and reused from the reflux tank 54 at the bottom. The separated gas moves to the air outlet at the top of the separation system 4 under the push of pressure, thereby realizing gas-liquid separation. The gas flowing out of the separation system 4 enters the filtration system 5 for filtration to obtain the treated waste gas. The treated waste gas still has some pressure and can be used as compressed air.

[0079] It should be noted that before the compression system 1 compresses the VOCs-containing waste gas into compressed waste gas, the VOCs-containing waste gas can also be filtered as needed to remove large particles and improve the effect of VOCs treatment.

[0080] It should be noted that, in order to ensure the atomization separation effect, the bacterial liquid is usually sprayed at the top of the sedimentation system 3. The bacterial liquid is atomized into fine droplets under the action of the atomizer, which float and settle along the entire pipeline. An outlet pipe is set at the bottom of the sedimentation system 3 to connect to the separation system 4 for gas-liquid separation. The time it takes for the bacterial bead droplets to travel from the top of the sedimentation system 3 to the separation system 4 is the adsorption treatment time of the strain on VOCs.

[0081] It should be noted that if Figure 3 As shown, the filter system 5 is usually configured as a multi-layer filter plate. From the air inlet to the air outlet, a filtrate plate 51, a filter membrane containing an adsorbent 52, and a waterproof and breathable semipermeable membrane 53 are sequentially arranged at intervals. The filtrate plate 51 can isolate the unseparated part of the liquid water. The filter membrane containing an adsorbent 52 is composed of a porous structure of zeolite or activated carbon, which can adsorb part of the small molecules involved in VOCs. The waterproof and breathable semipermeable membrane 53 can isolate water molecules and allow air or other small molecules to pass through, and is generally composed of PTFE. The top of the filter system 5 is a sealing structure, and a liquid reflux groove 54 is provided at the bottom of the filter system 5, which flows from the direction of the air outlet to the direction of the air inlet, wherein the reflux groove 54 is a one-way check setting in the flow direction, that is, the recovered water can only flow from the air outlet to the air inlet, and cannot flow back.

[0082] In combination with the second aspect, in some embodiments provided in the present application, the angle between the outlet of the gas pipeline 22 and the outlet of the liquid pipeline 21 is 30 to 60 degrees. When the angle between the outlet of the gas pipeline 22 and the outlet of the liquid pipeline 21 is within this range, the angle and strength of the compressed exhaust gas ejected from the gas outlet to be ejected on the bacterial liquid flowing out of the outlet of the liquid pipeline 21 can be better, thereby improving the atomization effect, reducing the waste of compressed exhaust gas and bacterial liquid, and improving the adsorption treatment effect of the bacterial liquid on VOCs in the compressed exhaust gas.

[0083] In combination with the second aspect, in some embodiments provided in the present application, the spray system 2 includes a liquid pipeline 21 and two gas pipelines 22, wherein the liquid pipeline 21 is located between the two gas pipelines 22. By arranging the two gas pipelines 22 on both sides of the liquid pipeline 21, the bacterial liquid can be sprayed into droplets by the compressed exhaust gas on both sides, thereby improving the spray effect, improving the contact efficiency between the strain and VOCs, and further improving the decomposition efficiency of the strain on VOCs.

[0084] Combined with the second aspect, such as Figure 4 and Figure 5As shown, in some embodiments provided in the present application, the separation system 4 includes a separation chamber 41 and a plurality of spoilers 42 extending radially along the separation chamber 41, and the plurality of spoilers 42 are arranged at intervals along the circumference of the separation chamber 41. The plurality of spoilers 42 constitute turbine blades, and the aerosol droplets entering the separation system 4 are separated from gas and liquid under the action of gravity and centrifugal force through the spoiled flow of the turbine blades, thereby realizing the recovery of bacterial liquid and the treatment of VOCs waste gas.

[0085] Combined with the second aspect, such as Figure 4 and Figure 5 As shown, in some embodiments provided in the present application, in order to improve the turbulence effect and the effect of blocking the bacterial liquid, the angle between adjacent spoilers 42 is 10 to 45°. By setting the spoilers 42 at an angle, the turbulence effect of the spoilers 42 can be improved, and at the same time, a channel is provided for the gas. It should be noted that there is a projected overlapping portion between the spoilers 42 to increase the isolation and separation effect on the bacterial liquid.

[0086] Combined with the second aspect, such as Figure 4 and Figure 5 As shown, in some embodiments provided in the present application, the separation system 4 includes a separation chamber 41 and an inlet 43 and an outlet 44 located at both ends of the separation chamber 41 in the radial direction, wherein the angle between the inlet and the outlet is 90 to 120°. Within this range, the angle between the inlet and the outlet can reduce the amount of bacterial liquid carried out, while improving the turbulence effect, so that the gas can flow out from the outlet more easily.

[0087] The technical solution provided by the present application is described in detail below in conjunction with the embodiments. The two-compound bacteria are Brevmonas LMR and Beyerlinckia LMW. The four-compound bacteria are Brevmonas LMR, Beyerlinckia LMW, Phytophaga diazotrophica LMH and Bacillus martensii LY.

[0088] Example 1

[0089] A method for treating waste gas containing VOCs comprises the following steps:

[0090] Containing VOCs 150mg / m 3 The exhaust gas is compressed to a pressure of 150 kPa;

[0091] The compressed exhaust gas with a pressure of 150kPa is transported at a flow rate of 300000m 3 / h, deatomization flow rate is 1000m 3 / h, the bacterial solution concentration is 20000TPU, the strain is a dual composite bacteria, and the solubility is 13.8g / m 3 s of bacterial liquid, the sedimentation chamber pressure is 120kPa, sedimentation is 1.5s, separation, filtration, and the treated waste gas is obtained;

[0092] The included angle between the compressed exhaust gas nozzle and the bacteria liquid nozzle is 30°, and compressed exhaust gas nozzles are arranged on both sides of the bacteria liquid nozzle.

[0093] Example 2

[0094] A method for treating waste gas containing VOCs comprises the following steps:

[0095] Containing VOCs 150mg / m 3 The exhaust gas is compressed to a pressure of 1500kPa;

[0096] The compressed exhaust gas with a pressure of 1500kPa is transported at a flow rate of 4000m 3 / h, deatomization flow rate is 100m 3 / h, the bacterial solution concentration is 4000TPU, the strain is a quadruple composite bacteria, and the solubility is 25g / m 3 s of bacterial liquid, settle in a sedimentation chamber at a pressure of 700 kPa for 15 s, separate, and filter to obtain treated waste gas;

[0097] The included angle between the compressed exhaust gas nozzle and the bacteria liquid nozzle is 60°, and compressed exhaust gas nozzles are arranged on both sides of the bacteria liquid nozzle.

[0098] Example 3

[0099] A method for treating waste gas containing VOCs comprises the following steps:

[0100] Containing VOCs 150mg / m 3 The exhaust gas is compressed to a pressure of 400 kPa;

[0101] The compressed exhaust gas with a pressure of 400 kPa is transported at a flow rate of 14000 m 3 / h, deatomization flow rate is 600m 3 / h, the bacterial solution concentration is 10000TPU, the strain is a dual composite bacteria, and the solubility is 15.5g / m 3 s of bacterial liquid, settle in a sedimentation chamber at a pressure of 450 kPa for 8 s, separate, and filter to obtain treated waste gas;

[0102] The included angle between the compressed exhaust gas nozzle and the bacteria liquid nozzle is 45°, and compressed exhaust gas nozzles are arranged on both sides of the bacteria liquid nozzle.

[0103] Example 4

[0104] A method for treating waste gas containing VOCs comprises the following steps:

[0105] Containing VOCs 150mg / m 3 The exhaust gas is compressed to a pressure of 200 kPa;

[0106] The compressed exhaust gas with a pressure of 200 kPa is transported at a flow rate of 40000 m 3 / h, deatomization flow rate is 800m 3 / h, the bacterial solution concentration is 15000TPU, the strain is a dual composite bacteria, and the solubility is 15.5g / m 3 s of bacterial liquid, settle in a sedimentation chamber at a pressure of 150 kPa for 5 s, separate, and filter to obtain treated waste gas;

[0107] The included angle between the compressed exhaust gas nozzle and the bacteria liquid nozzle is 45°, and compressed exhaust gas nozzles are arranged on both sides of the bacteria liquid nozzle.

[0108] Example 5

[0109] A method for treating waste gas containing VOCs comprises the following steps:

[0110] Containing VOCs 150mg / m 3 The exhaust gas is compressed to a pressure of 500 kPa;

[0111] The compressed exhaust gas with a pressure of 500 kPa is transported at a flow rate of 10000 m 3 / h, deatomization flow rate is 700m 3 / h, the bacterial solution concentration is 5000TPU, the strain is a dual composite bacteria, and the solubility is 15.5g / m 3 s of bacterial liquid, settle in a sedimentation chamber at a pressure of 350 kPa for 10 s, separate, and filter to obtain treated waste gas;

[0112] The included angle between the compressed exhaust gas nozzle and the bacteria liquid nozzle is 45°, and compressed exhaust gas nozzles are arranged on both sides of the bacteria liquid nozzle.

[0113] Example 6

[0114] A method for treating waste gas containing VOCs comprises the following steps:

[0115] Contains 150mg / m 3 The exhaust gas of VOCs is compressed to obtain a pressure of 140 kPa;

[0116] The compressed exhaust gas with a pressure of 140 kPa is transported at a flow rate of 3000 m 3 / h, deatomization flow rate is 90m 3 / h, the bacterial solution concentration is 9500TPU, the strain is a dual composite bacteria, and the solubility is 15.5g / m 3 s of bacterial liquid, settle in a sedimentation chamber at a pressure of 110 kPa for 20 s, separate, and filter to obtain treated waste gas;

[0117] The included angle between the compressed exhaust gas nozzle and the bacteria liquid nozzle is 15°, and compressed exhaust gas nozzles are arranged on both sides of the bacteria liquid nozzle.

[0118] Example 7

[0119] A method for treating waste gas containing VOCs comprises the following steps:

[0120] Contains 150mg / m 3 The exhaust gas of VOCs is compressed to obtain a pressure of 1550 kPa;

[0121] The compressed exhaust gas with a pressure of 1550kPa is transported at a flow rate of 350000m 3 / h atomization flow rate is 1100m 3 / h, the bacterial solution concentration is 25000TPU, the strain is a quadruple composite bacteria, and the solubility is 21.6g / m 3 s of bacterial liquid, settle in a sedimentation chamber at a pressure of 800 kPa for 0.5 s, separate, filter, and obtain treated waste gas;

[0122] The included angle between the compressed exhaust gas nozzle and the bacteria liquid nozzle is 75°, and compressed exhaust gas nozzles are arranged on both sides of the bacteria liquid nozzle.

[0123] Comparative Example 1

[0124] A method for treating waste gas containing VOCs, which differs from Example 6 in that:

[0125] The waste gas containing VOCs is not compressed and is normal pressure gas, and only normal pressure air is injected.

[0126] Comparative Example 2

[0127] A method for treating waste gas containing VOCs, which differs from Example 4 in that:

[0128] Atmospheric pressure treatment, the washing tower uses volcanic rock filler for filtration, and the bacterial liquid is sprayed onto the volcanic rock to adsorb and wash the exhaust gas.

[0129] Performance Testing

[0130] According to the methods for treating waste gas containing VOCs in Examples 1 to 7 and Comparative Examples 1 to 2, the main active gas of the bacterial liquid used is O 2 The metabolites are CO2 and H 2 O, environment δO 2 The absorption efficiency of VOCs in Examples 1 to 7 and Comparative Examples 1 to 2 was 21%. The specific test method of the absorption efficiency was calculated by the inlet VOC concentration Q1 and the outlet VOC concentration Q2. The Q value was measured by the non-methane total hydrocarbon detection equipment. The efficiency = (Q1-Q2) / Q1*100%. The test results are shown in Table 1:

[0131] Table 1 Absorption efficiency of VOCs by the waste gas treatment methods containing VOCs in Examples 1-7 and Comparative Examples 1-2

[0132]

[0133]

[0134] As can be seen from Table 1, the absorption efficiency of VOCs in Examples 1 to 7 exceeds 90%, among which the absorption efficiency of VOCs in Examples 3 to 5 exceeds 95%. Due to the low exhaust gas pressure and high VOC concentration, the absorption efficiency of Examples 6 and 7 is lower than that of Examples 1 to 5, but still higher than that of Comparative Examples 1 and 2.

[0135] Since the comparative example 1 adopts normal pressure waste gas to spray the bacterial liquid, it has the defects of insufficient atomization and extremely low contact efficiency.

[0136] In Comparative Example 2, the contact efficiency is low due to insufficient bacterial liquid contact, and the equipment volume is more than three times that of Example 4.

[0137] In summary, by compressing the waste gas containing VOCs so that the pressure of the compressed waste gas is greater than the standard atmospheric pressure, the content of VOCs in the unit volume of waste can be concentrated, the volume of the waste gas can be reduced, and then the bacterial solution that can absorb VOCs can be atomized by compressing the waste gas, so that in the fine droplets, more VOCs in the compressed waste gas can fully contact with the strains in the bacterial solution that can absorb VOCs, thereby increasing the concentration of the reactants, and then increasing the reaction rate of the strains and VOCs, so that within a certain reaction time, more VOCs are adsorbed and decomposed by the strains in the bacterial solution, thereby improving the treatment efficiency of the waste gas containing VOCs. At the same time, since the waste gas containing VOCs is compressed into compressed waste gas, the bacterial solution that can absorb VOCs is driven to atomize, and the pressure of the compressed waste gas can drive the movement of the droplets, reducing additional energy consumption, and the treatment product is carbon dioxide, which has little pollution to the environment. The treated waste gas can be separated from the bacterial solution through sedimentation, separation and filtration, the bacterial solution can be recycled and reused, and the waste gas can be further used as compressed air.

[0138] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0139] It should be noted that, in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically stipulated.

[0140] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for treating waste gas containing VOCs, characterized in that: The following steps are involved: Compressing the waste gas containing VOCs to obtain compressed waste gas; Atomize the bacterial solution capable of absorbing VOCs with compressed waste gas to obtain a mixed aerosol; The mixed gas mist is settled, separated and filtered to obtain the treated waste gas; Wherein, the pressure of the compressed exhaust gas is greater than the standard atmospheric pressure.

2. The method for treating waste gas containing VOCs according to claim 1, characterized in that: The active gas partial pressure coefficient in the VOCs-containing waste gas is δ, the standard atmospheric pressure is P0, the pressure of the compressed waste gas is P1, the active gas partial pressure in the VOCs-containing waste gas is P2, the active gas in the VOCs-containing waste gas inhibits the activity of the strain in the bacterial solution that can adsorb VOCs is P3, and the active gas includes oxygen and / or carbon dioxide, which satisfies: δP1<P3; δ=P2 / P0.

3. The method for treating waste gas containing VOCs according to claim 2, characterized in that: The pressure of the compressed exhaust gas is P1, 150kPa≤P1≤1500kPa.

4. The method for treating waste gas containing VOCs according to claim 1, characterized in that: The flow rate of the bacterial solution capable of adsorbing VOCs is V1, the flow rate of the compressed exhaust gas is V2, the solubility of the bacterial solution capable of adsorbing VOCs to VOCs is m, the pressure of the sedimentation chamber during sedimentation is P4, the standard atmospheric pressure is P0, the contact efficiency between the compressed exhaust gas and the bacterial solution capable of adsorbing VOCs is θ, the contact time between the compressed exhaust gas and the bacterial solution capable of adsorbing VOCs is t, and the adsorption efficiency of the bacterial solution capable of adsorbing VOCs to VOCs is: R=θV1·m·t / (V2·C·P4 / P0).

5. The method for treating waste gas containing VOCs according to claim 4, characterized in that: The flow rate of the bacterial solution capable of absorbing VOCs is V1, 100m 3 / h≤V1≤1000m 3 / h.

6. The method for treating waste gas containing VOCs according to claim 4, characterized in that: The flow rate of the compressed exhaust gas is V2,4000m 3 / h≤V2≤300000m 3 / h.

7. The method for treating waste gas containing VOCs according to claim 4, characterized in that: The contact time between the compressed exhaust gas and the bacterial solution capable of adsorbing VOCs is t, 1s≤t≤15s.

8. The method for treating waste gas containing VOCs according to claim 4, characterized in that: The pressure in the sedimentation chamber during sedimentation is P4, 120kPa≤P4≤700kPa.

9. The method for treating waste gas containing VOCs according to claim 1, characterized in that: The strain concentration in the bacterial solution capable of adsorbing VOCs is C, 1000TPU≤C≤20000TPU.

10. A waste gas treatment device containing VOCs, characterized in that: Including pipelines connected in sequence: A compression system for compressing the exhaust gas containing VOCs into compressed exhaust gas; The spray system includes a liquid pipeline for circulating a bacterial liquid capable of absorbing VOCs and at least one gas pipeline for circulating compressed waste gas, wherein the outlet of the gas pipeline is arranged at an angle to the outlet of the liquid pipeline; Sedimentation system; separation systems; and Filtration system.

11. The VOCs-containing waste gas treatment device according to claim 10, characterized in that: The angle between the outlet of the gas pipeline and the outlet of the liquid pipeline is 30 to 60 degrees.

12. The VOCs-containing waste gas treatment device according to claim 10, characterized in that: The spray system comprises a liquid pipeline and two gas pipelines, wherein the liquid pipeline is located between the two gas pipelines.

13. The VOCs-containing waste gas treatment device according to claim 10, characterized in that: The separation system comprises a separation chamber and a plurality of spoilers extending radially along the separation chamber, wherein the plurality of spoilers are arranged at intervals along the circumference of the separation chamber.

14. The VOCs-containing waste gas treatment device according to claim 13, characterized in that: The angle between adjacent spoilers is 10 to 45 degrees.

15. The VOCs-containing waste gas treatment device according to claim 10, characterized in that: The separation system comprises a separation chamber and an inlet and an outlet located at two ends of the separation chamber in a radial direction, wherein an angle between the inlet and the outlet is 90-120°.

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