A gas filter structure optimization method, filtering system and equipment

Abstract

The present invention relates to a structural optimization method, a filtering system and a device for a gas filter, comprising the following steps: S1: dividing the gas filter to be optimized into multiple sections along its axial direction; S2: establishing a three-dimensional model of the gas filter to be optimized based on the slope of each section; S3: calculating each flow field separately, and calculating the life factor based on the flow field and the three-dimensional model data; S4: judging whether the life factor of each section meets the standard, if so, determining the slope of the section, otherwise adjusting the slope of the corresponding section, and returning to step S2 until the life factor of each section meets the standard. Through the above settings, the present invention makes the service life of the filter material in each part of the filter more balanced, avoiding the problem of waste of filter material.

Description

Technical Field

[0001] The present invention relates to the technical field of filters, and in particular to a structure optimization method, a filtering system and equipment for a gas filter. Background Art

[0002] The cartridge filter is a common gas filter that filters chemical gases in the air, such as Figure 1-Figure 4 As shown, it is composed of an inner cylinder 1 shell and an outer cylinder 2 shell nested together, and a filter material 3 with adsorption capacity is filled between the two cylinders. Both the inner cylinder 1 and the outer cylinder 2 have multiple openings, and the aperture is smaller than the particle diameter of the filter material 3, so that air can pass through, but the filter material 3 cannot pass through. One end of the filter is an air inlet 5, and the other end is a blind plate 4. The air enters from the air inlet 5, and after being filtered by the filter material 3, the chemical substances carried by the gas are adsorbed by the filter material 3, and the clean air flows out radially from the outer cylinder 2. After the filter material 3 adsorbs a certain amount of chemical gas and reaches saturation, it will lose the filtering effect and needs to be replaced.

[0003] In traditional cylindrical filters, it is the dynamic pressure that drives the fluid forward at the air inlet, and the static pressure of the fluid that drives the fluid to flow out to the surrounding areas. In the initial section of the cylinder, the static pressure and dynamic pressure each account for a part, but at the end blind plate all the dynamic pressure is converted into static pressure, resulting in a higher static pressure near the end, so the flow rate to the surroundings is also greater, resulting in rapid consumption of filter media, while the filter media near the air inlet is consumed slowly due to its low speed. Therefore, the filter media at the end away from the air inlet has been used up, but the air inlet end has not been fully used. However, at this time, the overall efficiency of the filter is no longer up to standard and needs to be replaced, resulting in uneven use of filter media and serious waste. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the situation in the prior art that the filter material at one end away from the air inlet has been used up, while the filter material at the air inlet end has not been fully used. However, at this time, the overall efficiency of the filter is no longer up to standard and needs to be replaced, resulting in uneven use of the filter material and serious waste. Thus, a structural optimization method, filtering system and equipment for a gas filter are provided.

[0005] In order to solve the above technical problems, the present invention provides a method for optimizing the structure of a gas filter, comprising the following steps:

[0006] Step S1: Divide the gas filter to be optimized into multiple sections along its axial direction;

[0007] Step S2: establishing a three-dimensional model of the gas filter to be optimized based on the slope of each inner wall or outer wall;

[0008] Step S3: Calculate each flow field segment separately, and calculate the life factor based on the flow field and the three-dimensional model data;

[0009] Step S4: Determine whether each life factor meets the standard. If so, determine the slope of the inner wall or outer wall of the section. Otherwise, adjust the slope of the inner wall or outer wall of the corresponding section and return to step S2 until each life factor meets the standard.

[0010] In one embodiment of the present invention, in step S2, the slopes of the outer walls of each section of the gas filter to be optimized are equal, and the slopes of the inner walls of the filters of adjacent sections are not equal.

[0011] In one embodiment of the present invention, in step S3, the life factor calculation formula of each section of the gas filter to be optimized is as follows:

[0012]

[0013] in, represents the calculated lifespan, Indicates the volume of filler, It represents the packing density of the filler. Indicates the adsorption capacity of the filler, represents the initial concentration of chemical gas, represents the adsorption efficiency, Indicates flow rate.

[0014] In one embodiment of the present invention, in step S2, a gas filter model is established through a 3D modeling module. In step S3, each flow field of the gas filter is calculated separately through a CFD simulation module. After calculation, the CFD simulation module sends the slope that needs to be adjusted to the 3D modeling module. The 3D modeling module generates a gas filter 3D model through parameterized 3D modeling and sends it to the CFD simulation module.

[0015] In one embodiment of the present invention, in step S2, the inner wall slopes of each section of the gas filter to be optimized are equal, and the outer wall slopes of the filters of adjacent sections are not equal.

[0016] In one embodiment of the present invention, the wind speed uniformity of the cylindrical filter is evaluated, and the evaluation includes the following steps:

[0017] Step A1: define the test interface so that the test interface and the axis of the gas filter are perpendicular;

[0018] Step A2: grid the test interface and measure the flow velocity in each grid;

[0019] Step A3: Based on the speed measurement data, the relative standard deviation of wind speed between grids is calculated, and the wind speed uniformity is evaluated according to the value of the relative standard deviation.

[0020] The present invention also provides a gas filtration system, comprising:

[0021] A first shell is divided into multiple sections along the axial direction, and a flow channel extending along a first direction is provided therein; an input port is opened on a first side of the first shell, the input port is connected to the flow channel, and the gas to be filtered enters the flow channel through the input port;

[0022] The second shell is covered on the first shell. The first shell and / or the second shell is divided into multiple sections along the axial direction. A first filter space is formed between the first shell and the second shell. The gas to be filtered flows out along the thickness direction of the first filter space in the flow channel. The thickness of the first filter space gradually increases along the flow direction of the flow channel.

[0023] A filler filled in the filtering space;

[0024] A calculation module determines a life factor using the above-mentioned gas filter structure optimization method, and confirms the thickness of the first filter space according to the life factor.

[0025] In one embodiment of the present invention, an output port is provided on the other side of the first shell, the output port is connected to the other end of the flow channel, the output port is covered with a flow stabilizer, the flow stabilizer is an open-hole structure, a second filter space is provided in the flow stabilizer, the first filter space and the second filter space are connected, and the second filter space is filled with filler.

[0026] In one embodiment of the present invention, the stabilizer cap is a hemispherical opening structure or an arc-shaped opening structure.

[0027] In one embodiment of the present invention, the packing life is positively correlated with the packing thickness and the flow rate ratio through the packing, the flow rate through the packing is negatively correlated with the packing thickness, and the packing thickness is sufficient to make the packing life of each section of the cylindrical filter equal.

[0028] The present invention also provides a filtering device, comprising a plurality of adjacent gas filters, wherein the central axes of the plurality of gas filters are parallel.

[0029] The above technical solution of the present invention has the following advantages compared with the prior art:

[0030] The present invention discloses a method for optimizing the structure of a gas filter. By segmenting the cylindrical filter, a three-dimensional model is established and the flow field is analyzed, so as to evaluate the expected life of each segment. By continuously adjusting the slope of each segment, the life factor of each segment is relatively balanced. The rationality of the structure of each segment is judged based on whether the life factor meets the standard, and the segments that do not meet the standard are adjusted. Through continuous iterative optimization, the cylindrical filter structure is optimized. The amount of filter material used is reasonably distributed in combination with the flow field, so that the gas flow of each segment of the filter material in each part of the filter is more uniform, thereby making the service life of the filler in each part of the filter more balanced and avoiding the problem of filter material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

[0032] Figure 1 It is a schematic diagram of the structure of an existing cylindrical filter;

[0033] Figure 2 It is a schematic diagram of radial airflow of an existing cylindrical filter;

[0034] Figure 3 It is a schematic diagram of the end airflow of the existing cylindrical filter;

[0035] Figure 4 This is the end flow field cloud diagram of the existing cylindrical filter;

[0036] Figure 5 is a flow chart of the optimization method of the present invention;

[0037] Figure 6 It is a schematic diagram of the axial segmentation of the cylindrical filter of the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of the cylindrical filter of the present invention;

[0039] Figure 8 is a schematic diagram of the slope of the cylindrical filter of the present invention, taking the first housing inside as an example;

[0040] Fig. 9 is a schematic diagram of the flow rate of the cartridge filter before optimization;

[0041] Fig.10 It is a schematic diagram comparing the life factors of each section of the present invention and the existing cylindrical filter;

[0042] Fig.11 is a schematic diagram of radial airflow of the present invention;

[0043] Fig.12 It is a schematic diagram of the airflow at the end of the present invention;

[0044] Fig.13 It is the flow field cloud diagram at the end of the present invention;

[0045] Fig.14 It is a structural schematic diagram of an embodiment of the stabilizer cover of the present invention;

[0046] Fig.15 It is a structural schematic diagram of another embodiment of the stabilizer cover of the present invention.

[0047] Explanation of the reference numerals in the specification: 1. Inner cylinder; 2. Outer cylinder; 3. Filter material; 4. Blind plate; 5. Air inlet; 6. Flow stabilizer; 7. First shell; 8. Second shell; 9. Filler; 10. Input port. DETAILED DESCRIPTION

[0048] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention. Embodiment 1

[0049] Reference Figure 5-Figure 13 As shown, a method for optimizing the structure of a gas filter of the present invention comprises the following steps:

[0050] Step S1: Divide the gas filter to be optimized into multiple sections along its axial direction;

[0051] Specifically, see Figure 6 As shown, the gas filter to be optimized is measured to determine its axial length, and the axial length of the filter is evenly divided into multiple sections.

[0052] Step S2: establishing a three-dimensional model of the gas filter to be optimized based on the slope of each inner wall or outer wall;

[0053] Specifically, Figure 6-Figure 8 As shown, the slope k is calculated by measuring the height difference between the two ends of the segment and the ratio of the horizontal distances. The height difference is selected as the height difference of the wall of the second shell 8 or the first shell 7. The height difference is configured as the thickness of the first filter space for accommodating the filler. The horizontal distance is the length of the axial segment. According to the slope data k1, k2, k3... of each segment, a three-dimensional model of the segment is created using three-dimensional modeling software.

[0054] Step S3: Calculate each flow field segment separately, and calculate the life factor based on the flow field and the three-dimensional model data;

[0055] Specifically, by setting boundary conditions and fluid parameters and solving the control equations of fluid flow, the flow field distribution of each section can be obtained. Based on the flow field analysis results and the data of the three-dimensional model, the life factor of each section can be predicted and calculated.

[0056] Step S4: Determine whether each life factor reaches the standard. If yes, determine the slope of the inner wall or outer wall of the section. Otherwise, adjust the slope of the inner wall or outer wall of the corresponding section, and then return to step S2.

[0057] Specifically, the calculated life factor of each segment is compared with the preset standard value. If the life factor of a segment reaches or slightly exceeds the standard value, it means that the structural design of the segment meets the requirements, and the slope of the segment is determined and recorded; if the life factor of a segment exceeds the standard value by too much, it is also determined to be unbalanced, and the slope of the segment is reduced and re-modeled and calculated; if the life factor of a segment does not reach the standard value, it means that the structure of the segment needs to be adjusted, and according to the insufficient life factor, the slope of the segment is appropriately increased, and the model is re-calculated.

[0058] The present invention discloses a method for optimizing the structure of a gas filter, which segments the gas filter, establishes a three-dimensional model and analyzes the flow field, thereby evaluating the expected life of each segment, and continuously adjusting the slope of each segment so that the life factor of each segment can meet the design requirements. The rationality of the structure of each segment is judged based on whether the life factor meets the standard, and the substandard segments are adjusted. Through continuous iterative optimization, the cylindrical filter structure is optimized, and the amount of filler 9 used is reasonably distributed in combination with the flow field, which can effectively improve the overall service life of the filter and solve the problem of uneven utilization of the filler 9.

[0059] In step S2, taking the example of changing the inner wall slope, i.e., the slope of the first shell, in segments along the axial direction, the outer wall slopes of the cylinder of each segment of the gas filter to be optimized are equal, and the inner wall slopes of the cylinders of adjacent segments are not equal. The first shell 7 is the inner wall of the filter, and the second shell 8 is the outer wall of the filter. The second shell 8 is configured as a cylindrical barrel. Only the first shell 7 needs to be processed during structural optimization and modeling. By changing the size of the wall of the first shell 7, the slope change of each segment of the cylindrical filter structure is achieved. In addition, in some embodiments, the shapes of the first shell and the second shell are divided into multiple segments, and the inner diameters of the walls of the first shell and the second shell gradually increase along the flow channel direction, and the increase rate of the inner diameter of the first shell is smaller than that of the second shell, so that the thickness of the first filter space gradually increases along the flow channel direction; or the first shell The inner diameter of the wall of the first shell gradually decreases along the flow channel direction, and the inner diameter of the wall of the second shell gradually increases along the flow channel direction, so that the thickness of the first filter space gradually increases along the flow channel direction; or the inner diameter of the wall of the first shell and the second shell gradually decreases along the flow channel direction, and the increase rate of the inner diameter of the first shell is greater than that of the second shell, so that the thickness of the first filter space gradually increases along the flow channel direction; or the slope of each section of the second shell is zero, and the inner diameter of the wall of the first shell gradually decreases along the flow channel direction, so that the thickness of the first filter space gradually increases along the flow channel direction. This solution is suitable for configuring multiple gas filters to improve the installability when forming a gas filter array. The appearance is round and will not block the installation of adjacent gas filters and will not affect the airflow stability between adjacent gas filters.

[0060] In step S3, according to the law of conservation of mass, the adsorption capacity of the filler 9 is equal to the amount of pollutants in the air treated during the entire life cycle, so the following equation is obtained: Based on the above formula, the life factor calculation formula of each gas filter to be optimized is as follows:

[0061]

[0062] in, represents the calculated lifespan, Indicates the volume of filler, It represents the packing density of the filler. Indicates the adsorption capacity of the filler, represents the initial concentration of chemical gas, represents the adsorption efficiency, Indicates flow rate.

[0063] It can be seen from the above formula that for a certain packing 9 and working conditions, other parameters are constants, and the service life of the packing 9 is only related to two factors, namely, the volume V of the packing 9 and the gas flow Q, that is, Therefore, V / Q can be used to characterize the life span. The cylinder is divided into several sections along the airflow direction, and the life index V / Q is calculated for each section to evaluate the life balance of each section.

[0064] In step S2, a gas filter model is established through a 3D modeling module. In step S3, each flow field of the gas filter is calculated by a CFD simulation module. After calculation, the CFD simulation module sends the slope that needs to be adjusted to the 3D modeling module. The 3D modeling module uses modeling software such as SolidWorks, Creo or CATIA. The 3D modeling module generates a 3D model of the gas filter by parameterized 3D modeling and sends it to the CFD simulation module. The flow field calculation data includes the volume of filler 9, the stacking density of filler 9, the adsorption capacity of filler 9, the initial concentration of the chemical gas to be filtered, the adsorption efficiency of filler 9 and the flow rate. When the t value is large, it means that the service life of the filter is long; conversely, when the t value is small, it means that the service life of the filter is short, and the segment is marked as a segment to be optimized. By calculating the life factor of each segment of the gas filter to be optimized, the performance and life of each segment of the filter as a whole can be comprehensively evaluated.

[0065] In step S2, the filter inner wall slopes of each section of the gas filter to be optimized are equal, and the filter outer wall slopes of adjacent sections are not equal. Specifically, the cylindrical inner wall slope of the gas filter to be optimized is zero, and the filter outer wall slopes of adjacent sections are not equal. The first shell 7 is configured as a cylindrical cylinder, and only the second shell 8 needs to be processed during structural optimization and modeling. When the gas to be filtered enters the filter, it will not collide with the inner wall of the filter, thereby reducing the generation of turbulence or eddy currents inside the first shell 7 of the filter. By changing the size of the wall of the second shell 8, the slope of each section of the cylindrical filter structure can be changed, so that the cylindrical filter has different filler 9 accommodation spaces at each radial interface along the axial direction.

[0066] It also includes testing the air velocity uniformity of the gas filter, and the test includes the following steps:

[0067] Step A1: define the test interface so that the test interface and the axis of the gas filter are perpendicular;

[0068] Specifically, the test interface is on the output port side of the cylinder and is 100 mm-200 mm away from the end of the cylinder, and the interface size is (100 mm-200 mm)·(100 mm-200 mm).

[0069] Step A2: grid the test interface and measure the flow velocity in each grid;

[0070] Specifically, the test interface and the axial direction of the filter are in the same straight line, the test interface is divided into (20mm-40mm)·(20mm-40 mm) blocks, a measuring point is set at the center of each block, and a single-point anemometer is used to measure the speed at each measuring point. In this embodiment, the interface size is selected as 150mm·150mm, the block size is selected as 30 mm·30 mm, and the number of blocks is 25.

[0071] Step A3: Based on the speed measurement data, the relative standard deviation of wind speed between grids is calculated, and the wind speed uniformity is evaluated according to the value of the relative standard deviation.

[0072] Specifically, relative standard deviation (RSD) is used for characterization, and the specific calculation formula is as follows:

[0073]

[0074] in, Indicates the number The grid point velocity, It represents the average flow velocity of all grid points, and the RSD value is used to evaluate the wind speed uniformity at the end of the gas filter. Embodiment 2

[0075] like Figure 7 As shown, this embodiment provides a gas filter, comprising:

[0076] A first shell 7, in which a flow channel extending in a first direction is provided, and an input port 10 is provided on one side of the first shell 7, the input port 10 is connected to the flow channel, and the gas to be filtered enters the flow channel through the input port 10;

[0077] The second shell 8 is coated on the first shell 7. The first shell 7 and / or the second shell 8 are divided into multiple sections along the axial direction thereof. A first filter space is enclosed between the first shell 7 and the second shell 8. The gas to be filtered flows out along the thickness direction of the first filter space in the flow channel. The thickness of the first filter space gradually increases along the flow direction of the flow channel. The thickness of the first filter space increases along the flow direction of the flow channel at an increasing rate, and the increasing rate is determined based on the slope of the filter.

[0078] Filler 9, which is filled in the filtering space;

[0079] A calculation module determines a life factor using a gas filter structure optimization method as described in Example 1, and confirms a thickness of the first filter space according to the life factor.

[0080] A gas filter is provided in this embodiment, and the gas to be filtered enters the flow channel through the input port 10 at one end of the first shell 7. The gas to be filtered flows in the flow channel along a first direction and passes through the first shell 7, the filler 9 in the first filter space and the second shell 8 along the cylindrical radial direction. When the gas passes through the first filter space, it can fully contact with the filler 9 to be adsorbed or reacted and filtered. The filler 9 adsorbs and filters impurities and harmful substances in the gas. The gas filtered through the first filter space is discharged from the outlet of the filter to complete the filtration process. By adopting the structural optimization method as described in Example 1, the thickness of the filler 9 layer gradually increases along the gas flow direction, and the slope of the filter is determined. Then, the increase rate of the thickness of the first filter space is designed according to the slope, so that the structure of the filter is more reasonable, which can better meet the filtering requirements, and can effectively improve the overall service life of the filter, so that the life of the filler 9 in the filter is more balanced.

[0081] like Figure 3-Figure 4 , Figure 10-13 As shown, an output port is provided on the other side of the first shell 7, and the output port is connected to the other end of the flow channel, avoiding the use of a blind plate, reducing the static pressure at the end of the flow channel, making the flow field before improvement more uniform, and increasing the passing capacity of the filtered gas. The output port is covered with a flow stabilizer 6, and the flow stabilizer 6 is an open-hole structure. A second filter space is provided in the flow stabilizer 6. The first filter space and the second filter space are connected, and the second filter space is filled with filler 9. After the gas enters the flow channel from the input port 10 of the first shell 7, it flows in the flow channel. A part of the gas flows out from the thickness direction of the first filter space between the first shell 7 and the second shell 8, and the other part of the gas passes through the flow stabilizer 6 and the second filter space, and is filtered by the filler 9 in the second filter space.

[0082] The filler is activated carbon, and chemical substances such as chemical reagents can be added and mixed with the activated carbon to filter, adsorb, neutralize or remove toxic substances, acidic substances, alkaline substances, active compounds, volatile organic compounds, etc. in the air to be purified.

[0083] Continue to refer to Figure 3-Figure 4 , Figure 14-15 As shown, the flow stabilizer 6 is a hemispherical opening structure or an arc-shaped opening structure. The airflow filtered from the side wall of the gas filter utilizes the Coanda effect, so that when the airflow on the side wall of the cylindrical filter flows toward the end, the fluid flows backward along the surface of the hemispherical and arc-shaped flow stabilizer 6. The flow stabilizer 6 improves the airflow condition at the rear of the cylinder, makes the gas flow rate discharged from the output port more stable, reduces the vortex and turbulence caused by airflow fluctuations, and makes the airflow at the end of the filter stable in a shorter distance, thereby reducing the reserved space occupied by the end of the filter.

[0084] like Figure 11-Figure 12As shown, the life of packing 9 is positively correlated with the thickness of packing 9, and the life of packing 9 is positively correlated with the thickness of packing 9 and the ratio of the flow rate passing through packing 9, and the flow rate passing through packing 9 is negatively correlated with the thickness of packing 9. The thickness of packing 9 satisfies the requirement of making the life of packing 9 of each section of the gas filter equal. In the gas filter, the greater the thickness of packing 9, the greater the gas resistance, resulting in a smaller flow rate passing through the packing 9 there. The volume of each section of packing 9 is set according to the balance of the life factor, and the life of packing 9 is positively correlated with the thickness of packing 9 and the ratio of the flow rate passing through packing 9.

[0085] like Fig. 9 , Fig.10 As shown, the air flow velocity at the end of the traditional cylindrical filter away from the air inlet is high. Figure 7 The horizontal axis represents the distance from the air inlet of the cylindrical filter in meters, and the vertical axis represents the air flow velocity in meters per second. Figure 8 The horizontal axis represents the distance from the air inlet or input port 10 of the cylindrical filter, in m, and the vertical axis represents the life factor, wherein the line graph of the square marked points (the starting vertical coordinate position is between 180-200) represents the life factor before optimization, and the line graph of the circular marked points (the starting vertical coordinate position is between 80-100) represents the life factor after optimization. It can be seen from the above figure that after structural optimization, the life of the gas filter of this embodiment is more balanced along the length direction. Embodiment 3

[0086] This embodiment also provides a filtering device, including the gas filter as described in Example 2, including a plurality of adjacent gas filters, the central axes of the plurality of gas filters are parallel, and a plurality of gas filters are arranged in a matrix.

[0087] The filtering device provided in this embodiment increases the filtering capacity by arranging a plurality of gas filters in a matrix, and maintains an appropriate spacing between each gas filter so that the filtered gas can flow from the gaps between the filters to the end.

[0088] Multiple gas filters are detachably arranged on the frame to facilitate replacement of damaged or life-limited cylindrical filters. Furthermore, the second shell 8 and the first shell 7 of each gas filter are detachably arranged, or the seal of the first filter space is detachably arranged, so that the filler 9 in a single gas filter can be replaced, thereby reducing the replacement cost of the cylindrical filter.

[0089] The filtering device also includes an air intake system and an exhaust system. The air to be filtered enters the gas filter arranged in the matrix through the air intake system. In the air intake system, the air first passes through a pretreatment device to remove large particle impurities and some harmful substances. The pretreated air enters the inner flow channels of multiple gas filters respectively under the power of the intake air. In the filter body, the air is filtered by the fillers 9 of multiple gas filters to remove fine particles and harmful substances in the gas. The filtered air is discharged from the system through the exhaust system. In the exhaust system, the exhaust fan discharges the filtered gas into the external environment.

[0090] It also includes a control system for real-time monitoring of the operating status of the entire filtration system, including intake and exhaust data, filter pressure difference, filtration efficiency, etc. Based on the monitored data, the control system automatically adjusts the system's operating parameters to ensure the system's operating efficiency and filtration effect.

[0091] It also includes a filtration effect monitoring system, which monitors the quality of the filtered air in real time through sensors. The detection area is set at the output side of one or more cylinder sensors to detect whether the filtered gas meets the emission standards. If it is found that the air quality does not meet the standards, the system will issue an alarm, stop air intake and exhaust, and clean or replace the filter.

[0092] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A method for optimizing the structure of a gas filter, characterized in that: The following steps are involved: Step S1: Divide the gas filter to be optimized into multiple sections along its axial direction; Step S2: establishing a three-dimensional model of the gas filter to be optimized based on the slope of each inner wall or outer wall; Step S3: Calculate each flow field segment separately, and calculate the life factor based on the flow field and the three-dimensional model data. The life factor calculation formula is as follows: ； in, represents the calculated lifespan, Indicates the volume of filler, It represents the packing density of the filler. Indicates the adsorption capacity of the filler, represents the initial concentration of chemical gas, represents the adsorption efficiency, Indicates flow rate; Step S4: Determine whether each life factor of each segment meets the standard. If so, determine the slope of the inner wall or outer wall of the segment. Otherwise, adjust the slope of the inner wall or outer wall of the corresponding segment, and return to step S2 until each life factor meets the standard. Also included is a gas filtration system comprising: A first shell, in which a flow channel extending in a first direction is provided, an input port is opened on a first side of the first shell, the input port is connected to the flow channel, and the gas to be filtered enters the flow channel through the input port; The second shell is covered on the first shell. The first shell and / or the second shell is divided into multiple sections along the axial direction. A first filter space is formed between the first shell and the second shell. The gas to be filtered flows out along the thickness direction of the first filter space in the flow channel. The thickness of the first filter space gradually increases along the flow direction of the flow channel. A filler filled in the filtering space; A calculation module is used to determine a life factor by using the structure optimization method of the gas filter, and to confirm a thickness of the first filter space according to the life factor.

2. The method for optimizing the structure of a gas filter according to claim 1, characterized in that: In step S2, the slopes of the outer walls of each section of the gas filter to be optimized are equal, and the slopes of the inner walls of the filters of adjacent sections are not equal.

3. The method for optimizing the structure of a gas filter according to claim 1, characterized in that: In step S2, a gas filter model is established through a 3D modeling module. In step S3, each flow field of the gas filter is calculated separately through a CFD simulation module. After calculation, the CFD simulation module sends the slope that needs to be adjusted to the 3D modeling module. The 3D modeling module generates a gas filter 3D model through parameterized 3D modeling and sends it to the CFD simulation module.

4. The method for optimizing the structure of a gas filter according to claim 1, characterized in that: In step S2, the inner wall slopes of each section of the gas filter to be optimized are equal, and the outer wall slopes of the filters of adjacent sections are not equal.

5. The method for optimizing the structure of a gas filter according to claim 1, characterized in that: It also includes evaluating the wind speed uniformity of the gas filter, and the evaluation includes the following steps: Step A1: define the test interface so that the test interface and the axis of the gas filter are perpendicular; Step A2: grid the test interface and measure the flow velocity in each grid; Step A3: Based on the speed measurement data, the relative standard deviation of wind speed between grids is calculated, and the wind speed uniformity is evaluated according to the value of the relative standard deviation.

6. The method for optimizing the structure of a gas filter according to claim 5, characterized in that: An output port is provided on the second side of the first shell, and the output port is connected to the output end of the flow channel. The output port is covered with a flow stabilizer, and the flow stabilizer is an open-hole structure. A second filter space is provided in the flow stabilizer. The first filter space and the second filter space are connected, and the second filter space is filled with filler.

7. The method for optimizing the structure of a gas filter according to claim 6, characterized in that: The flow stabilizer is a hemispherical opening structure or an arc-shaped opening structure.

8. The method for optimizing the structure of a gas filter according to claim 5, characterized in that: The life of the packing is positively correlated with the packing thickness and the ratio of the flow rate passing through the packing, and the flow rate passing through the packing is negatively correlated with the thickness of the packing. The thickness of the packing is sufficient to make the packing life of each section of the gas filter equal.

9. A filtering device, comprising the gas filtering system according to any one of claims 1 to 8, characterized in that: The invention comprises a plurality of adjacent gas filters, wherein the central axes of the plurality of gas filters are parallel.

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