Filter element spraying modification system and modification method

Abstract

The invention relates to a filter element spraying modification system and method. The system comprises a modification subsystem, a drying subsystem and a conveying subsystem. The conveying subsystem is provided with a conveying roller and a conveying belt and used for conveying the filter element to be modified to the modification subsystem and the drying subsystem for modification and drying. The modification subsystem is provided with a modification reagent tank and a modification spray head assembly, and the spray head assembly comprises a first modification spray head and a plurality of second modification spray heads which are used for spraying the inner wall and the outer wall of the filter element respectively, so that uniform modification is realized. The drying subsystem is composed of a first draught fan, a heater and an air outlet, and dry air at the specific temperature is provided to quickly dry the filter element. Wherein the modified spray head assembly has rotating and vertical adjusting functions so as to meet the requirements of different filter elements. The efficient and uniform filter element modification can be realized, and the solvent loss is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of aerosol purification, and in particular to a filter element spray modification system and a modification method. Background Art

[0002] In the field of air pollution control, when solid or liquid particles are suspended in the air, aerosols are formed, becoming an important pollutant. Aerosols are widely present in chemical production, biomedicine, nuclear industry, optical electronics, precision instruments and other fields, posing a potential threat to the environment and operational safety. In nuclear sites, even radioactive aerosols are produced, which are more harmful. High-efficiency filters based on glass fiber filter materials can effectively filter and remove aerosols, and have become one of the core equipment used in many industries for pollutant control and clean environment protection, effectively meeting the strict requirements of many industries for pollutant emissions or environmental cleanliness.

[0003] However, the actual process conditions in some industries are characterized by high humidity, high acidity, and even high radiation, which puts higher requirements on the tolerance of glass fiber filter materials and filters. Especially in high humidity or strong acid environments, glass fiber filter materials are easily damaged, thus affecting the stability of the filter. Once the filter material tolerance is insufficient, the filter is prone to problems such as filter material breakage, rapid increase in filtration resistance, and the need for frequent replacement, which not only increases the amount of solid waste treatment, but also leads to a significant increase in the cost of use. Therefore, in order to improve the tolerance and operating stability of filtration equipment under complex working conditions, it is urgent to modify the glass fiber filter material in a targeted manner.

[0004] In the prior art, filter material modification processes are mostly for flat filter materials, and there is no related public technology for direct modification operation methods of cylindrical filter elements. In view of the above problems, the present invention is proposed. Summary of the invention

[0005] The invention discloses a filter element spray modification system and a modification method, aiming to solve the technical problems existing in the prior art.

[0006] According to one aspect of the present invention, a filter element spray modification system is provided, comprising a modification subsystem, a drying subsystem and a conveying subsystem;

[0007] The conveying subsystem is provided with conveying rollers and conveying belts, which are connected to each other. The filter element to be modified is arranged on the conveying belt and moves along the horizontal conveying direction under the drive of the conveying belt. The conveying rollers, conveying belts and the filter element conveyed by them are all arranged below the modifying subsystem and the drying subsystem.

[0008] The modification subsystem is provided with a modification reagent tank and a modification nozzle assembly for providing a modification reagent solvent. The modification nozzle assembly includes a first modification nozzle and a plurality of second modification nozzles arranged in parallel. The first modification nozzle is located at the center of the plurality of second modification nozzles. The first modification nozzle and the plurality of second modification nozzles cooperate to spray the inner wall and the outer wall of the filter element respectively.

[0009] The drying subsystem is provided with a first fan, a heater and an air outlet. The first fan and the heater cooperate to provide dry air with a specific temperature. The air outlet is arranged above the conveyor belt and the filter element conveyed by the conveyor belt to ensure that the dry air is effectively discharged and dries the modified filter element.

[0010] The modification nozzle assembly is arranged on the left side of the air outlet, and the filter element passes through the modification nozzle assembly and the air outlet in sequence along the conveying direction to optimize the continuity of the modification and drying process.

[0011] As a preferred technical solution, the first modified nozzle is configured as a self-driven rotating nozzle structure.

[0012] As a preferred technical solution, the outlets of the plurality of second modified nozzles are arranged to face the side wall of the filter element.

[0013] As a preferred technical solution, a bracket, a screw lift and a connecting hose are sequentially arranged above the first modified nozzle and multiple second modified nozzles. The screw lift can drive the bracket, the first modified nozzle and multiple second modified nozzles to move up and down in the vertical direction, and the connecting hose is used to provide space and amplitude for the displacement of the screw lift.

[0014] As a preferred technical solution, the support is configured as a hollow tube structure.

[0015] As a preferred technical solution, the bracket is configured to be rotatable, and the plurality of second modified nozzles can also rotate along the periphery of the filter element driven by the bracket.

[0016] As a preferred technical solution, the first fan, the heater and the air outlet are arranged in the same vertical direction, and the vertical direction is perpendicular to the conveying direction.

[0017] As a preferred technical solution, the specific temperature is 40°C-80°C.

[0018] As a preferred technical solution, a shell is also provided, and the modifying subsystem, the drying subsystem and the conveying subsystem are arranged inside the shell.

[0019] As a preferred technical solution, a recovery subsystem is also provided, and the recovery subsystem is arranged outside the shell.

[0020] As a preferred technical solution, the recovery subsystem is provided with a second fan and a condensation recovery device, and the second fan and the condensation recovery device cooperate to recover the modified solvent vaporized inside the shell.

[0021] According to another aspect of the present invention, there is also provided a modification method using the above filter element spray modification system, comprising the following steps:

[0022] Using a conveyor belt, the filter element to be modified is conveyed to the lower position corresponding to the first modification nozzle and the plurality of second modification nozzles;

[0023] Injecting a modifier solvent into a modifier tank, and spraying the modifier on the filter element using a first modification nozzle and a plurality of second modification nozzles;

[0024] The first fan and the heater are turned on to dry the modified filter element through the air outlet.

[0025] As a preferred technical solution, after the modified filter element is dried, the second fan and the condensation recovery device are turned on to cool the liquefied and vaporized modifier solvent.

[0026] The technical solution adopted by the present invention can achieve at least one of the following beneficial effects:

[0027] 1. The present invention realizes uniform spraying on the inner wall and the outer wall of the filter element by setting a combined structure of a first modified nozzle and a plurality of second modified nozzles, thereby effectively improving the coverage and consistency of the modification effect.

[0028] 2. The first modified nozzle in the modified nozzle assembly of the present invention has a self-driven rotation function, and multiple second modified nozzles can face the side wall of the filter element. Combined with the rotation of the bracket and the vertical movement function of the screw lift, the system can flexibly adapt to the modification requirements of different filter elements and accurately control the spraying angle and range.

[0029] 3. In the present invention, the fan, heater and air outlet in the drying subsystem ensure the effective circulation and control of dry air. Dry air at a specific temperature (40°C-80°C) can quickly dry the filter element, avoiding the influence of residual moisture on the modification effect.

[0030] 4. In the present invention, the second fan and condensation recovery device equipped in the recovery subsystem effectively recover the solvent vaporized during the modification process, reduce solvent loss, realize the effective recycling of resources, and improve the environmental performance of the system.

[0031] 5. The modification subsystem, drying subsystem and conveying subsystem of the present invention are all arranged inside the housing, which reduces interference from the external environment and provides a relatively closed space for operation, further improving modification efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0033] Figure 1 The present invention is a schematic diagram of the working principle of a filter element spray modification system.

[0034] Description of reference numerals:

[0035] 1. Modification subsystem; 11. Modification reagent tank; 12. Modification reagent pump; 13. Liquid flow meter; 14. Connecting hose; 15. Screw lift; 6. Bracket; 17. Modification nozzle assembly; 171. First modification nozzle; 172. Second modification nozzle; 2. Drying subsystem; 21. First fan; 22. First gas flow meter; 23. Heater; 24. Air outlet; 3. Conveying subsystem; 31. Conveying roller; 32. Conveying belt; 33. Filter element; 4. Recovery subsystem; 41. First one-way valve; 42. Second one-way valve; 43. Second fan; 44. Second gas flow meter; 45. Condensation recovery device; 46. Housing; 5. Partition. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In order to solve the problems existing in the prior art, the embodiment of the present invention provides a filter element spray modification system, and in particular, relates to a spray modification system for a cylindrical filter element, wherein the center of the cylindrical filter element is a hollow structure. The present invention is also applicable to filter element structures of other shapes with hollow interiors, such as Figure 1 As shown, it includes a modification subsystem 1, a drying subsystem 2 and a conveying subsystem 3, and the above subsystems are arranged inside the housing 46. Among them, the modification subsystem 1 is used to achieve uniform spraying of the modifier to improve the surface performance and functional characteristics of the filter element; the drying subsystem 2 is used to quickly and evenly dry the modifier on the surface of the filter element after spraying to ensure the stable adhesion and effective function of the modifier layer; the conveying subsystem 3 is used to convey the filter element 33 to be modified into the modification area of ​​the modification subsystem 1 and the drying area of ​​the drying subsystem 2 for spraying modification and drying.

[0040] like Figure 1 As shown, the conveying subsystem 3 includes a plurality of conveying rollers 31, a conveyor belt 32 and a filter element 33 located above the conveyor belt 32. The combined design of the plurality of conveying rollers 31 and the conveyor belt 32 can ensure that the filter element 33 maintains a stable movement during the spraying and drying process, which helps to avoid the problem of uneven spraying caused by shaking or displacement of the surface of the filter element 33. The plurality of conveying rollers 31 can adapt to filter elements 33 of different thicknesses and sizes by adjusting the spacing and rotation speed, ensuring that they always maintain good flatness during the conveying process. The conveyor belt 32 provides stable mobile support on the conveying path, so that the filter element 33 passes through the spraying and drying areas at an appropriate speed, thereby achieving a uniform spraying effect. Preferably, the number of conveying rollers 31 is 6-10. In order to ensure that the filter element 33 is conveyed through the modification subsystem 1 and the drying subsystem 2, the conveying subsystem 3 is arranged below the modification subsystem 1 and the drying subsystem 2, and the horizontal plane of the conveyor belt 32 is lower than the modification subsystem 1 and the drying subsystem 2.

[0041] by Figure 1 The orientation of the spray modification system in use state shown in the figure is taken as the standard, the modification subsystem 1 is arranged on the left side of the drying subsystem 2, the modification subsystem 1 and the drying subsystem 2 are arranged together above the conveying subsystem 3, and the filter element 33 to be modified conveyed by the conveying subsystem 3 moves along the horizontal conveying direction, and is modified by the modification subsystem 1 and dried by the drying subsystem 2 in turn to obtain the modified filter element 33.

[0042] The modification subsystem 1 includes a modification reagent tank 11, a modification reagent pump 12, a liquid flow meter 13, a connecting hose 14, a screw lift 15, a bracket 16 and a modification nozzle assembly 17 which are connected in sequence. The modification reagent tank 11 and the modification reagent pump 12 are located in the same horizontal plane, the connecting hose 14, the screw lift 15 and the bracket 16 are located in the same vertical plane, and the horizontal plane is perpendicular to the vertical plane; the modification nozzle assembly 17 is arranged at the end of the bracket 16. The modification reagent tank 11 is used to provide the modification reagent; the modification reagent pump 12 is connected to the liquid flow meter 13 to control the flow of the modification reagent; the connecting hose 14, the screw lift 15 and the bracket 16 are arranged in the same vertical direction, that is, the direction perpendicular to the conveying direction of the filter element 33, and the connecting hose 14, the screw lift 15 and the bracket 16 cooperate to drive the modification nozzle assembly 17 to move up and down in the vertical direction perpendicular to the conveying direction of the filter element 33 to perform modification spraying. That is, during the modification process, when the modification reagent solvent is sprayed out from the modification nozzle assembly 17, the screw lift 15 drives the bracket 16 to start moving up and down in the vertical direction to spray and modify the filter element 33. The modification nozzle assembly 17 includes a first modification nozzle 171 and a plurality of second modification nozzles 172, and the first modification nozzle 171 and the plurality of second modification nozzles 172 cooperate to spray the hollow inner wall and the outer side wall of the filter element 33 respectively. In order to ensure the uniformity and sufficiency of the spraying on the surface of the filter element, preferably, the first modified nozzle 171 is set as a self-driven rotating nozzle structure, and the kinetic energy is utilized by the self-rotating design, so that the modifier solvent is evenly spread in a spiral shape at the outlet of the first modified nozzle 171, covering a larger area and reducing overlapping spraying, effectively improving the uniformity of the spraying modification; the outlets of the plurality of second modified nozzles 172 are set to face the direction of the outer side wall of the filter element 33, that is, the spraying direction of the second modified nozzle 172 is perpendicular to the direction of the side wall of the filter element 33, and the bracket 16 is set to be rotatable. When the bracket 16 rotates, it drives the plurality of second modified nozzles 172 to rotate along the periphery of the filter element 33 to increase the uniformity of the spraying on the outer surface of the filter element. Preferably, the number of the second modified nozzles 172 is 2-6. The above-mentioned modification nozzle is used to apply the modifying agent solvent to the surface of the filter element 33 to be modified by spraying, so as to form a uniform and dense modification layer to enhance its filtering effect, durability, anti-pollution and other specific application needs.

[0043] The drying subsystem 2 includes a first fan 21, a first gas flow meter 22, a heater 23 and an air outlet 24 which are connected in sequence. Figure 1The above equipment is arranged on the same vertical plane, and the direction of the vertical plane is perpendicular to the conveying direction of the filter element 33 to be modified. The air outlet 24 is located above the conveying direction, and the dry gas is discharged to dry the modified filter element 33. Based on the horizontal direction determined by the conveying direction, the modification nozzle assembly 17 is located on the left side of the air outlet 24, so that the filter element 33 to be modified is first modified by the modification nozzle assembly 17 under the conveying of the conveyor belt 32, and then dried by the air outlet 24.

[0044] Through the above structural design, first, the conveying subsystem 3 is used to provide continuous and stable conveyance of the filter element 33 to be modified, and the conveyor belt 32 is used to convey the filter element 33 to the position directly below the modified nozzle assembly 17; secondly, the modified reagent is added to the modified reagent tank 11, and the flow and speed of the modified reagent are controlled by setting the parameters of the modified reagent pump 12 and the liquid flow meter 13. When the modified reagent solvent is sprayed out from the modified nozzle assembly 17, the screw lift 15 is immediately started to drive the bracket 16 and the first modified nozzle 171 and the second modified nozzle 172 arranged at the end of the bracket 16 to move up and down in the vertical direction, and the modified reagent solvent is sprayed onto the surface of the filter element 33 to be modified through the first modified nozzle 171 and the second modified nozzle 172; the parameters of the first gas flow meter 22 are set, the first fan 21 and the heater 23 are turned on, and the modified filter element 33 is dried through the air outlet 24. The above subsystems can be used to spray modify and dry the filter element, and the system structure is simple and the operation process is simple and convenient. At the same time, the above subsystems are all arranged inside the housing 46 to isolate the outside and ensure the green and environmental protection of the modification process.

[0045] In some preferred embodiments, a recovery subsystem 4 is further provided outside the housing 46 for condensing and recovering the vapor of the modifier solvent inside the housing 46, thereby realizing efficient recovery and reuse of the modifier solvent. Figure 1The orientation of the spray modification system shown in the use state is based on the first one-way valve 41 arranged on the left side of the shell 46, the second one-way valve 42, the second fan 43, the second gas flow meter 44 and the condensation recovery device 45 arranged on the right side of the shell 46 and connected in sequence, so as to ensure the effective recovery of the modifier solvent and the environmental protection of the whole system. The first one-way valve 41 and the second one-way valve 42 are used to ensure the one-way flow of the airflow, prevent the recovered modifier solvent or gas from flowing back to the modification area of ​​the modification subsystem 1 and the drying area of ​​the drying subsystem 2, so as to maintain the airflow stability of the recovery subsystem 4 and ensure the safety and efficiency of the recovery process. In order to achieve the above purpose, preferably, the first one-way valve 41 is an air inlet one-way valve, and the second one-way valve 42 is an air outlet one-way valve. The second fan 43 is used to generate a negative pressure or positive pressure airflow, effectively guide the modifier solvent gas volatilized during the spray modification and drying process to the condensation recovery device 45, and improve the efficiency of the modifier solvent recovery. Preferably, the condenser recovery device 45 includes a condensing coil, a refrigeration device and a collection container, which are used to cool the modifier solvent gas to a liquid state for recovery and reuse, thereby reducing the consumption and emission of the modifier solvent, improving the environmental protection and economy of the entire system, and realizing green and environmental protection of the entire modification process.

[0046] In some preferred embodiments, the modifying agent tank 11 is provided with a stirring device for continuously stirring the injected modifying agent to ensure uniform distribution of the components of the modifying agent, thereby achieving consistency in the concentration of each component of the modifying agent during the spraying process, obtaining a uniform modification effect, and avoiding stratification or precipitation due to long-term standing. In addition, continuous stirring can also prevent the highly viscous modifying agent from adhering to the side wall or bottom of the modifying agent tank 11, reducing the risk of clogging and extending its service life.

[0047] In some preferred embodiments, the modifying agent is one of a charge modifying agent, a catalytic modifying agent, a hydrophobic modifying agent, an oleophobic modifying agent, an acid-base resistant modifying agent, and an anti-wear modifying agent.

[0048] In some preferred embodiments, the support 16 adopts a hollow tube structure, and the support 16 is connected to the first modification nozzle 171 and the second modification nozzle 172, so that the modification reagent solvent is sprayed evenly.

[0049] In some preferred embodiments, in order to improve the drying effect and balance the drying rate of the modifier with the heat resistance and modification effect of the filter material, the temperature of the hot air discharged from the air outlet 24 is 40-80° C. Within this temperature range, the modifier solvent can be effectively evaporated, and can be evenly dried on the surface of the filter material and form a stable attachment, while avoiding thermal damage to the filter material structure caused by excessively high temperatures.

[0050] In some preferred embodiments, the flow parameter of the second gas flow meter 44 is set to 1-2 times the flow parameter of the first gas flow meter 22 to ensure that the gas collection speed in the recovery subsystem 4 is faster, generating negative pressure on the gas environment in the housing 46, and facilitating the recovery of the modifier solvent gas.

[0051] In some preferred embodiments, the first fan 21 and the second fan 43 are turned off for a time interval of 0-30 minutes to ensure that the recovery subsystem 4 fully recovers the gas in the housing 46 after the drying process is completed.

[0052] The present invention also provides a modification method for a filter element using the above-mentioned spray modification system, comprising the following steps:

[0053] S1: using the conveyor belt 32 to convey the filter element 33 to be modified to the position corresponding to the first modification nozzle 171 and the second modification nozzle 172, that is, to the position directly below the first modification nozzle 171 and the second modification nozzle 172;

[0054] S2: inject the modifier into the modification reagent tank 11, turn on its stirring device, and continuously stir the modifier; set the flow parameter of the liquid flow meter 13, and start the modification reagent pump 12. When the modification reagent solvent is sprayed from the first modification nozzle 171 and the second modification nozzle 172, immediately start the screw lift 15 to perform spray modification;

[0055] S3: transferring the modified filter element 33 to the corresponding position of the air outlet 24, setting the parameters of the first gas flow meter 22, starting the first fan 21 and the heater 23, and drying the modified filter element 33;

[0056] S4: setting the second gas flow meter 44, turning on the second fan 43 and the condensation recovery device 45, cooling, liquefying and recovering the modifier solvent gas volatilized by heat;

[0057] S5: After the spray modification is completed, the heater 23 and the first fan 21 are turned off in sequence. After a certain period of time, the condensation recovery device 45 and the second fan 43 are turned off to ensure that the recovery subsystem 4 fully recovers the gas in the shell 46.

[0058] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A filter element spray modification system, characterized in that: It includes a modification subsystem, a drying subsystem and a conveying subsystem; The conveying subsystem is provided with a conveying roller and a conveying belt, the conveying roller and the conveying belt are connected, the filter element to be modified is arranged on the conveying belt, and is driven by the conveying belt to move along the horizontal conveying direction; the conveying roller, the conveying belt and the filter element conveyed by the conveying roller are all arranged below the modifying subsystem and the drying subsystem; The modification subsystem is provided with a modification reagent tank and a modification nozzle assembly for providing a modification reagent solvent, the modification nozzle assembly comprises a first modification nozzle and a plurality of second modification nozzles arranged in parallel, the first modification nozzle is located at the center of the plurality of second modification nozzles, and the first modification nozzle and the plurality of second modification nozzles cooperate to spray the inner wall and the outer wall of the filter element respectively; The drying subsystem is provided with a first fan, a heater and an air outlet. The first fan and the heater cooperate to provide dry air with a specific temperature. The air outlet is arranged above the conveyor belt and the filter element conveyed by the conveyor belt to ensure that the dry air is effectively discharged and dries the modified filter element. The modification nozzle assembly is arranged on the left side of the air outlet, and the filter element passes through the modification nozzle assembly and the air outlet in sequence along the conveying direction to optimize the continuity of the modification and drying process.

2. The filter element spray modification system according to claim 1, characterized in that: The first modified nozzle is configured as a self-driven rotating nozzle structure.

3. The filter element spray modification system according to claim 1, characterized in that: The outlets of the plurality of second modifying nozzles are arranged to face the side wall of the filter element.

4. The filter element spray modification system according to claim 1, characterized in that: A bracket, a screw lift and a connecting hose are arranged in sequence above the first modified nozzle and multiple second modified nozzles. The screw lift can drive the bracket, the first modified nozzle and multiple second modified nozzles to move up and down in the vertical direction. The connecting hose is used to provide space and amplitude for the displacement of the screw lift.

5. The filter element spray modification system according to claim 4, characterized in that: The support is configured as a hollow tube structure.

6. The filter element spray modification system according to claim 5, characterized in that: The bracket is configured to be rotatable, and the plurality of second modified nozzles can also rotate along the periphery of the filter element driven by the bracket.

7. The filter element spray modification system according to claim 1, characterized in that: The first fan, the heater and the air outlet are arranged in the same vertical direction, and the vertical direction is perpendicular to the conveying direction.

8. The filter element spray modification system according to claim 1, characterized in that: The specific temperature is 40°C-80°C.

9. The filter element spray modification system according to any one of claims 1 to 8, characterized in that: A shell is also provided, and the modifying subsystem, the drying subsystem and the conveying subsystem are arranged inside the shell.

10. The filter element spray modification system according to claim 9, characterized in that: A recovery subsystem is also provided, and the recovery subsystem is arranged outside the housing.

11. The filter element spray modification system according to claim 10, characterized in that: The recovery subsystem is provided with a second fan and a condensation recovery device, and the second fan and the condensation recovery device cooperate to recover the modified reagent solvent vaporized inside the shell.

12. A modification method using the filter element spray modification system according to any one of claims 1 to 11, characterized in that: The steps include: Using the conveyor belt, convey the filter element to be modified to the lower position corresponding to the first modification nozzle and the plurality of second modification nozzles; Injecting the modifier solvent into the modifier tank, and spraying the modifier on the filter element using the first modification nozzle and the plurality of second modification nozzles; The first fan and the heater are turned on to dry the modified filter element through the air outlet.

13. The modification method according to claim 12, characterized in that: After the modified filter element is dried, the second fan and the condensation recovery device are turned on to cool the liquefied and vaporized modifier solvent.

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