CN109966816A - A composite filter element and volatile organic compound purification device - Google Patents

Abstract

The invention discloses a composite filter element and a volatile organic compound purification device, relates to the technical field of exhaust gas purification, and is especially suitable for the purification treatment of large air volume and low concentration VOCs exhaust gas. The composite filter element includes a filter body and a primary filter body, the filter body is a hollow columnar structure, the primary filter body includes a first filter membrane layer and a second filter membrane layer, and the second filter membrane layer is sleeved on the outer surface of the filter body, The first filter membrane layer is sleeved on the outer surface of the second filter membrane layer. The composite filter element has the advantages of wide application range, high adsorption capacity, simple replacement operation, low treatment cost, shock load resistance, multiple regeneration and utilization, and low treatment cost. The whole is regenerated and recycled, thereby reducing the purification cost of VOCs exhaust gas.

Description

A composite filter element and volatile organic compound purification device

technical field

The invention relates to the technical field of exhaust gas purification, in particular to a composite filter element and a volatile organic compound purification device.

Background technique

The physical definition of volatile organic compounds (VOCs) refers to any organic compound with an initial boiling point lower than or equal to 250°C at 101.325kPa. From the perspective of improving ambient air quality and strengthening the prevention and control of VOCs pollution, its photochemical definition refers to organic compounds participating in atmospheric photochemical reactions, or organic compounds determined by measurement or accounting according to prescribed methods. Generally speaking, VOCs include non-methane hydrocarbons (alkanes, alkenes, alkynes, aromatic hydrocarbons, etc.), oxygen-containing organics (aldehydes, ketones, alcohols, ethers, etc.), chlorine-containing organics, nitrogen-containing organics, sulfur-containing organics, etc. It is an important precursor for the formation of ozone (O ₃ ) and fine particulate matter (PM _2.5 ) pollution. VOCs are the second most widely distributed and complex air pollutants except for particulate matter. There are three main hazards to the ecological environment system and human health: one is that some species are toxic and carcinogenic, and endanger human health; Oxides jointly participate in atmospheric photochemical reactions to form ozone pollution; third, secondary aerosols are generated by chemical reactions, which are important prerequisites for fine particulate matter (PM _2.5 ). Controlling and reducing the emissions of volatile organic compounds (hereinafter referred to as VOCs) from various pollution sources is an important way to reduce the concentration of atmospheric ozone and PM _2.5 and improve air quality.

The working principle of the VOCs adsorption device is that the exhaust gas is powered by the fan, and the negative pressure enters the adsorption box and then enters the adsorption layer. Using the characteristics of activated carbon or molecular sieve with many microporous structures, large specific surface area and strong adsorption capacity, the exhaust gas and the large surface porous When the activated carbon adsorbent is in contact, the pollutants in the exhaust gas are adsorbed on the inner surface of the activated carbon or molecular sieve, so that the pollutants are separated from the gas, and the purified gas is discharged at high altitude. The purification efficiency of a well-designed device can reach more than 90%.

The inventor's research found that the flat bed structure of the traditional adsorption purification device is single, the usable adsorption area per unit volume is small, and it is difficult to operate and replace during use.

SUMMARY OF THE INVENTION

The object of the present invention includes providing a composite filter element, which can increase the adsorption bed area of the unit volume adsorption device and reduce the pressure drop of gas filtration.

The purpose of the present invention includes providing a volatile organic compound purification device, the quick-installed filter element (adsorbent bed layer) is convenient to replace, the cost is low, and the operation is easy.

Embodiments of the present invention are implemented as follows:

Based on the above purpose, embodiments of the present invention provide a composite filter element, including a primary filter body and a filter body, the filter body is a hollow columnar structure, the primary filter body includes a first filter membrane layer and a second filter membrane layer, the first filter body The second filter membrane layer is sheathed on the outer surface of the filter body, and the first filter membrane layer is sheathed on the outer surface of the second filter membrane layer.

In addition, the composite filter element provided according to the embodiment of the present invention may also have the following additional technical features:

In an optional embodiment of the present invention, the first filter membrane layer includes at least one of composite water-absorbing fibers, spray-melting polypropylene oil-absorbing fibers and primary filter fibers;

The second filter membrane layer includes at least one of activated carbon non-woven fabric, activated carbon fiber felt or filter cotton.

In an optional embodiment of the present invention, the adsorption filter layer of the filter body includes an activated carbon filter layer or a molecular sieve filter layer;

The activated carbon filter layer includes at least one of granular activated carbon, honeycomb activated carbon, hollow cylindrical activated carbon, or activated carbon fiber filter cotton;

The molecular sieve filter layer includes at least one of granular molecular sieves, honeycomb molecular sieves or hollow columnar molecular sieves.

In an optional embodiment of the present invention, the composite filter element further includes a handle cover plate and an end cover sealing plate arranged oppositely, the handle cover plate is located at one end of the filter body and the initial removal filter body, and the end cover sealing plate is located at the filter body and the initial removal filter body. the other end of the filter.

The present invention provides a volatile organic compound purification device, comprising the above-mentioned composite filter element.

In an optional embodiment of the present invention, the purification device further includes a box body, the box body includes an air inlet, a filter cavity and an air outlet that are connected in sequence, and the composite filter element is installed in the box body and extends into the filter cavity, so that the gas to be purified is Enter from the air inlet, flow through the composite filter element and then discharge from the air outlet.

In an optional embodiment of the present invention, the filter cavity includes a first cavity and a second cavity that communicate with each other, the inlet of the first cavity is communicated with the air inlet, and the outlet of the second cavity is communicated with the air outlet;

The box body is provided with a plurality of filter element installation holes corresponding to the first cavity, and the composite filter element is installed in the filter element installation holes in one-to-one correspondence, so that the gas to be purified enters from the air inlet and flows through the second cavity after passing through the composite filter element. body, discharged from the air outlet.

In an optional embodiment of the present invention, the composite filter element includes a handle cover plate and an end cover sealing plate arranged oppositely, and the composite filter element is embedded in the filter cavity;

The handle cover plate is sealed with the box body, the end cover sealing plate is provided with a ventilation hole, or the handle cover plate is provided with a ventilation hole, and the end cover sealing plate is sealed and arranged to allow the gas to be purified. After passing through the composite filter element, it flows into the second cavity through the ventilation hole.

In an optional embodiment of the present invention, the filter cavity includes a first filter cavity, a second filter cavity and a gas flow cavity, the first filter cavity and the second filter cavity are located on two sides of the gas flow cavity, and are respectively It communicates with the gas flow cavity, the inlet of the first filter cavity and the inlet of the second filter cavity are both connected with the air inlet, and the outlet of the first filter cavity and the outlet of the second filter cavity are both connected with the inlet of the gas flow cavity connected, the outlet of the gas flow cavity is communicated with the gas outlet;

The box body is provided with a plurality of filter element installation holes, and a filter element guide rail is arranged below the filter element installation hole. The composite filter element is installed in the filter element installation hole through the filter element guide rail, and the filter element installation holes can respectively correspond to the first filter cavity and the second filter cavity. The composite filter elements are installed in the filter element installation holes one by one, so that the gas to be purified enters from the air inlet, passes through the composite filter element and flows through the gas flow cavity, and is discharged from the air outlet.

In an optional embodiment of the present invention, the purification device further includes a controller, a sensor and an alarm device;

Both the sensor and the alarm device communicate with the controller, the sensor is arranged in the filter cavity and is located at the gas outlet end of the composite filter element, and is used to output a signal representing the pressure drop difference in the filter cavity , the controller is used to control the state of the alarm device according to the output signal of the sensor.

The beneficial effects of the embodiments of the present invention include: the volatile organic compound purification device is mainly used for the filtration of air and exhaust gas, and the purification of integrated VOCs adsorption, compact structure, automatic operation, high purification efficiency, recyclable filter body, secondary Low pollution, low cost and good economic benefits.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a cross-sectional view of a composite filter element provided in Embodiment 1 of the present invention;

Fig. 2 is the sectional view of the composite filter element that embodiment 2 provides;

3 is a schematic structural diagram of the volatile organic compound purification device provided in Example 3;

Fig. 4 is the sectional view of Fig. 3;

5 is a schematic diagram of another structure of a volatile organic compound purification device;

FIG. 6 is a cross-sectional view of the volatile organic compound purification device provided in Example 4. FIG.

Icon: 100-composite filter element; 10-handle cover plate; 102-hand end sealing seat; 12-filter body; 121-outer mesh; 123-adsorption filter layer; 125-inner mesh; 126-reinforcing rod; 13-initial removal Filter body; 132-first filter membrane layer; 135-second filter membrane layer; 15-end cover sealing plate; 152-vent hole; 16-rubber piece; 103-operating handle; 104-vent sealing seat; 105-oil-resistant gasket; 156-test port; 200-volatile organic compound purification device; 20-box body; 21-air inlet; 22-first cavity; 23-second cavity; 24-air outlet; 225 - Filter element installation hole; 25 - sensor; 224 - first filter cavity; 226 - second filter cavity; 228 - gas flow cavity.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or It can be connected in one piece; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

Example 1

FIG. 1 is a cross-sectional view of a composite filter element 100 provided in this embodiment, as shown in FIG. 1 .

The composite filter element 100 provided in Embodiment 1 of the present invention includes a handle cover 10, a filter body 12, a primary filter body 13, and an end cover sealing plate 15. The primary filter body 13 is sleeved on the filter body 12 to form a filter assembly, which is then installed. Between the handle cover 10 and the end cover sealing plate 15, the filter body 12 is a hollow columnar structure. discharge.

Since the exhaust gas contains volatile organic compounds (VOCs), the composite filter element 100 provided in this embodiment can perform adsorption pretreatment on particulate matter, oil droplets, moisture and other substances in the exhaust gas through the first filter membrane layer 132 of the primary filter body 13. The second filter membrane layer 135 is used for the adsorption of high-boiling point organic matter (or semi-volatile) and difficult-to-desorb macromolecular organic matter, and then filters and adsorbs the exhaust gas through the filter body 12 to ensure the adsorption capacity and efficiency of the filter body 12.

The specific structure of each component of the composite filter element 100 and the corresponding relationship with each other will be described in detail below.

Referring to FIG. 1 , the primary filter body 13 includes a first filter layer 132 and a second filter layer 135 , the second filter layer 135 is sleeved on the outer surface of the filter body 12 , and the first filter layer 132 is sleeved It is arranged on the outer surface of the second filter membrane layer 135 .

Wherein, the second filter membrane layer 135 includes at least one of activated carbon non-woven fabric, activated carbon fiber felt or filter cotton, which is mainly used for adsorbing volatile organic compounds of medium and small molecules.

The first filter membrane layer 132 includes at least one of composite water-absorbing fibers, spray-melted polypropylene oil-absorbing fibers, and primary filter fibers, wherein the primary filter fibers include at least one of activated carbon non-woven fabrics, activated carbon fiber felts, and filter cloths, and activated carbon is free of The woven fabric is primary or medium-efficiency, and the primary-efficiency filter fiber can be composed of single-layer or multi-layer composites. It is mainly used to intercept oil droplets, moisture or difficult-to-desorb macromolecular organics. The first filter membrane layer 132 and the second filter membrane layer 135 are disposable, and can be removed and discarded when the adsorption condition is reached after using for a period of time.

The filter element body includes an outer mesh 121, an adsorption filter layer 123, an inner mesh 125 and a reinforcing rod 126. The inner mesh 125 is arranged on the inner surface of the adsorption filter layer 123, and the outer mesh 121 is arranged on the outer surface of the adsorption filter layer 123. Through the outer mesh 121 And the inner mesh 125 realizes the protection of the adsorption filter layer 123 .

Optionally, the adsorption filter layer 123 includes an activated carbon filter layer or a molecular sieve filter layer, wherein the activated carbon filter layer includes at least one of granular activated carbon, honeycomb activated carbon, hollow columnar activated carbon, and activated carbon fiber filter cotton; the molecular sieve filter layer includes granular activated carbon. At least one of molecular sieves, cellular molecular sieves or hollow columnar molecular sieves.

Optionally, the inner mesh 125 and the outer mesh 121 are made of round hole mesh or diamond mesh, and the material is galvanized steel or stainless steel, which improves the compressive strength and prevents the composite filter element 100 from being damaged and deformed during use, replacement and regeneration.

In order to improve the strength of the filter element body, a reinforcing rod 126 is arranged in the middle of the adsorption filter layer 123 . Since the adsorption filter layer 123 is a hollow columnar structure, the number of the reinforcing rods 126 is plural, and the reinforcement rods 126 are evenly spaced along the circumferential direction of the adsorption filter layer 123 . The middle of the filter layer 123.

The handle cover 10 is located at the front end of the filter element body, the handle cover 10 is connected to the filter body 12 through the handle end sealing seat 102, the end cover sealing plate 15 is located at the rear end of the filter element body, and the end cover sealing plate 15 is also the exhaust end sealing seat , the exhaust end sealing seat is arranged opposite to the handle end sealing seat 102, and the exhaust end sealing seat is provided with an exhaust hole 152, thereby forming a complete structure.

The handle cover 10 and the end cover cover 15 are both sealed structures. When the composite filter element 100 is installed in the purification device, it can achieve a sealing effect at the connection with the purification device. Optionally, the handle cover 10 and the end cover The sealing plate 15 is made of high temperature resistant materials such as galvanized steel sheet, stainless steel and aluminum alloy, and the handle cover part can be made of engineering plastics.

Optionally, the handle cover plate 10 and the end cover cover plate 15 are sealed with high-quality fluororubber parts 16, which have good sealing performance. Specifically, a sealing groove is provided at the joint of the handle cover 10 and the joint of the end cover sealing plate 15, and a high-quality fluororubber piece is selected to be sleeved in the sealing groove. achieve sealing effect.

It can be understood that the seal here can also adopt seals of other materials and structures, as long as the sealing effect can be achieved, and the specific seals are not limited.

In addition, the thickness of the adsorption filter layer 123 of the filter body 12 in the composite filter element 100 is designed according to the VOCs concentration and the allowable filtration pressure drop. The length of the filter element body is generally not more than 1200mm, and the diameter is generally not more than 500mm. The size of the composite filter element 100 may be determined according to actual requirements, which is not limited in this embodiment.

A handle cover 10 is arranged at the end of the composite filter element 100. By disposing a quick-release disk cover at the handle cover 10, the problems of quick installation and easy disassembly are solved, and the replacement work can be completed within a few seconds. It can be completed without the aid of tools, and the composite filter element 100 is provided with a primary removal filter body 13 and a filter body 12, so that the filter body 12 can be easily recycled.

Compared with the traditional bed-type activated carbon filter, the composite filter element 100 provided in this embodiment has the advantages of high filtration efficiency, low filtration resistance, good regeneration effect, the filter body 12 is not easily damaged, and the filter body 12 is not easily damaged by the first removal of the filter body 13 Easier to regenerate, reducing production costs.

The composite filter element 100 provided in this embodiment has the advantages of wide application range, high adsorption capacity, simple replacement operation, low treatment cost, impact load resistance, multiple regeneration and utilization, and low treatment cost. The composite filter element 100 after use is initially In addition to the filter body 13, it can be directly treated as waste and can be used for one-time use. The inner filter body 12 is desorbed with hot air (150°C) and can be recycled, which reduces the production cost and saves a lot of wood or coal resources for making activated carbon. .

Example 2

After research, the inventor has also made structural improvements to the composite filter element 100 provided by the present invention. On the basis of the above-mentioned Embodiment 1, the following optional other structural schemes can also be made. The composite filter elements 100 provided in Example 1 are basically the same, and the differences are specifically explained as follows:

FIG. 2 is a cross-sectional view of the composite filter element 100 provided in this embodiment. As shown in FIG. 2 , structural improvements have been made to the handle cover 10 and the end cover sealing plate 15 .

Specifically, the handle cover 10 includes an operating handle 103 , an exhaust end sealing seat 104 and an oil-resistant gasket 105 .

The exhaust end sealing seat 104 is blocked at the front end of the filter body 12 and can be matched with the installation hole of the purification device. The oil-resistant sealing gasket 105 is arranged on the inner side of the exhaust end sealing seat 104, and the oil-resistant sealing gasket 105 realizes the sealing effect. Operation The handle 103 is arranged on the outer side of the exhaust end sealing seat 104, which is convenient for the operator to perform operations such as installation and replacement from the outside.

Specifically, the end cover sealing plate 15 is opposite to the exhaust end sealing seat 104 and is disposed at the rear end of the filter body 12 . The end cover sealing plate 15 is provided with a test port 156 so that the exhaust gas to be purified can be removed from the composite filter element 100 . In the circumferential direction, it enters the primary removal filter body 13 and the filter body 12 in sequence, and is discharged from the test port 156 of the end cover sealing plate 15 after filtering.

Example 3

Embodiment 3 of the present invention provides a device 200 for purifying volatile organic compounds, including a box body 20 and at least one composite filter element 100 as provided in Embodiment 1 or Embodiment 2.

FIG. 3 is a schematic diagram of the volatile organic compound purification device 200, and FIG. 4 is a cross-sectional view of FIG. 3. Please refer to FIG. 3 and FIG. 4, and the specific description is as follows:

The box body 20 includes an air inlet 21, a filter cavity and an air outlet 24 that are communicated in sequence. The composite filter element 100 is installed in the box body 20 and extends into the filter cavity, so that the gas to be purified enters from the air inlet 21 and flows through the composite filter element 100. The filter element 100 is then discharged from the air outlet 24 .

The filter cavity includes a first cavity 22 and a second cavity 23 that are communicated. The inlet of the first cavity 22 is communicated with the air inlet 21 , and the outlet of the second cavity 23 is communicated with the air outlet 24 . The box body 20 is provided with a plurality of filter element installation holes 225 corresponding to the first cavity 22 along the flow direction of the exhaust gas. 225 , so that the filter cavity is a sealing section, so that the gas to be purified enters from the air inlet 21 , then passes through the composite filter element 100 for filtration in turn, then flows through the second cavity 23 , and finally is discharged from the air outlet 24 .

Optionally, a filter element guide rail is provided below the filter element installation hole 225 opened on the box body 20 , a sealing base is arranged at the bottom of the filter element installation hole 225 , and the composite filter element 100 is installed in the filter element installation hole 225 through the filter element guide rail.

The composite filter element 100 includes a handle cover plate 10 and an end cover sealing plate 15 arranged oppositely. In this embodiment, the handle cover plate 10 is a closed end, and the end cover sealing plate 15 is provided with ventilation holes. When the composite filter element 100 is installed in the box After entering the body 20, the handle cover 10 is sealed with the box body 20, the gas to be purified enters from the air inlet 21 of the box body 20, passes through the composite filter element 100 and flows into the second cavity 23 from the ventilation hole, and finally flows from the air outlet 24. discharge.

It can be understood that, in addition to the above connection methods, other connection structures may also be provided. For example, FIG. 5 is a schematic diagram of other real structures different from the above-mentioned embodiments, please refer to FIG. 5 .

The composite filter element 100 includes a handle cover plate 10 and an end cover sealing plate 15 arranged oppositely. When in use, the composite filter element 100 needs to be fully embedded in the filter cavity, and the filter cavity of the box body 20 is closed by the cover plate. The handle cover plate 10 is provided with a ventilation hole at the end, and the end cover sealing plate 15 is sealed. When the composite filter element 100 is installed in the box body 20, the gas to be purified enters from the air inlet 21 of the box body 20, and passes through the composite filter element 100. The ventilation hole at the end of the handle cover 10 flows into the second cavity 23 , and is finally discharged from the air outlet 24 .

Specifically, the operator holds the handle cover 10 of the composite filter element 100, inserts the end cover sealing plate 15 into the filter element installation hole 225, and pushes it into the filter cavity along the guide rail of the filter element, and aligns the exhaust end sealing seat 104 with the sealing base, Turn the quick-release disk cover at the 10 end of the handle cover to make it rotate clockwise or counterclockwise to a certain angle to achieve sealing with the sealing base. In this embodiment, the quick-release disk cover is rotated clockwise by 30° to 90° to achieve sealing with the sealing base.

The purification device provided in Embodiment 3 belongs to a VOCS purification structure in a single-side exhaust gas, and is composed of a composite filter element 100 and a box body 20. It can be understood that the purification device also includes a sensor 25, a flow meter, a controller, and an alarm device.

Both the sensor 25 and the alarm device communicate with the controller. The sensor 25 is arranged in the filter cavity of the box body 20 and is located at the air outlet end of the composite filter element 100, and is used to output a signal representing the pressure drop difference in the filter cavity. The controller is used for according to the sensor 25. The output signal controls the state of the alarm device.

Among them, the sensor 25 is a differential pressure sensor, which is used to detect the pressure drop of the gas passing through the composite filter element 100. If the pressure drop is too low or too high, an alarm is required. Under certain gas flow conditions, when the indicated value of the differential pressure sensor exceeds the specified limit , the abnormal operating status alarm will be triggered; when the indicated value of the differential pressure sensor exceeds the specified upper limit, it means that the filter element is saturated and needs to be replaced; when the indicated value of the differential pressure sensor is lower than the specified lower limit, it means that the two chambers There is air leakage between the body or the filter element, and the purification efficiency decreases.

The flowmeter is an exhaust flowmeter, which is used to measure the flow of gas. When a composite filter element 100 in the purification device is not tightly sealed or leaked, the filter pressure will drop below the set value. At this time, part of the exhaust gas escapes and VOCs are purified. The effect is poor and needs to be maintained as soon as possible, which can ensure the effective purification and removal of pollutants in the gas.

The working principle of the activated carbon adsorption purification device is: the exhaust gas is powered by the fan, and the negative pressure enters the adsorption box and then enters the activated carbon adsorption layer. The pollutants in the activated carbon are adsorbed on the surface of the activated carbon, which is separated from the gas mixture, and the purified gas is discharged at high altitude.

The volatile organic compound purification device 200 provided in this embodiment has a reasonable design and a compact structure, and is used for the integrated purification of air and exhaust gas filtration and VOCs adsorption. , high adsorption capacity. The traditional fixed-bed activated carbon device has improved the problems of small adsorption area, large bed resistance, difficult filter material replacement operation, activated carbon and other adsorption materials easily polluted by high-boiling organics, low regeneration and activation efficiency, and high one-time use costs. It has small wind resistance coefficient, large adsorption capacity, low equipment energy consumption, low operating cost, easier desorption and desorption, automatic operation, high purification efficiency, recyclable filter element, low secondary pollution, low cost and good economic benefits, suitable for Purification of large air volume and low concentration of VOCs.

Example 4

On the basis of the above-mentioned Embodiment 3, the inventor can also make the following optional other structural solutions. The volatile organic compound purification device 200 provided in this embodiment 4 is basically the same as the volatile organic compound purification device 200 provided in the third embodiment, The difference is detailed as follows:

FIG. 6 is a cross-sectional view of the purification device provided in Embodiment 4, please refer to FIG. 6 .

The box body 20 includes an air inlet 21, a filter cavity and an air outlet 24 that are communicated in sequence. The filter cavity includes a first filter cavity 224, a second filter cavity 226 and a gas flow cavity 228, wherein the first filter cavity 224 and The second filter cavity 226 is located on both sides of the gas flow cavity 228, and the first filter cavity 224 and the second filter cavity 226 are respectively communicated with the gas flow cavity 228. The inlet of the first filter cavity 224 and the second filter cavity The inlet of the cavity 226 is connected with the air inlet 21 , the outlet of the first filter cavity 224 and the outlet of the second filter cavity 226 are connected with the inlet of the gas circulation cavity 228 , and the outlet of the gas circulation cavity 228 is communicated with the air outlet 24 .

Optionally, the box body 20 is provided with a plurality of filter element installation holes 225 along the gas flow direction. The filter element installation holes 225 can respectively correspond to the first filter cavity 224 and the second filter cavity 226. The total number of filter element installation holes 225 is the same, and the composite filter element 100 is installed in the filter element installation holes 225 in one-to-one correspondence.

In order to make the gas to be purified enter the box body 20 from the air inlet 21, after being purified by the composite filter element 100 in the box body 20, it is discharged from the hole of the end cover sealing plate 15 of the composite filter element 100, and after being collected by the gas flow cavity 228, it is discharged from the outlet. The air port 24 is exhausted.

The purification device provided in this Example 4 has a double-side purification structure, which improves the problems of small adsorption area, large bed resistance and high cost of traditional purification devices. It is mainly used for filtration of air and waste gas, and purification of integrated VOCs adsorption. It is suitable for the purification treatment of VOCs with large air volume and low concentration, with compact structure, automatic operation, high purification efficiency, recyclable filter body 12, low secondary pollution, low cost and good economic benefits.

It should be noted that the features in the embodiments of the present invention may be combined with each other under the condition of no conflict.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a composite filter core, is characterized in that, comprises just removing filter body and filter body, described filter body is hollow columnar structure, and described just removing filter body comprises the first filter membrane layer and the second filter membrane layer, described The second filter film layer is sleeved on the outer surface of the filter body, and the first filter film layer is sleeved on the outer surface of the second filter film layer. 2. The composite filter element according to claim 1, wherein the first filter membrane layer comprises at least one of composite water-absorbing fibers, spray-melting polypropylene oil-absorbing fibers and primary filter fibers; The second filter membrane layer includes at least one of activated carbon non-woven fabric, activated carbon fiber felt or filter cotton. 3. The composite filter element according to claim 1, wherein the adsorption filter layer of the filter body comprises an activated carbon filter layer or a molecular sieve filter layer; The activated carbon filter layer includes at least one of granular activated carbon, honeycomb activated carbon, hollow cylindrical activated carbon, or activated carbon fiber filter cotton; The molecular sieve filter layer includes at least one of granular molecular sieves, honeycomb molecular sieves or hollow columnar molecular sieves. 4. The composite filter element according to any one of claims 1-3, characterized in that, the composite filter element further comprises a handle cover plate and an end cover sealing plate arranged oppositely, and the handle cover plate is located between the filter body and the filter body. At one end of the filter body for preliminary removal, the end cap sealing plate is located at the other end of the filter body and the filter body for preliminary removal. 5. A device for purifying volatile organic compounds, characterized in that it comprises the composite filter element according to any one of claims 1-4. 6 . The volatile organic compound purification device according to claim 5 , wherein the purification device further comprises a box body, and the box body comprises an air inlet, a filter cavity and an air outlet connected in sequence, and the composite filter element It is installed on the box body and extends into the filter cavity, so that the gas to be purified enters from the air inlet, flows through the composite filter element and is discharged from the air outlet. 7 . The device for purifying volatile organic compounds according to claim 6 , wherein the filter cavity comprises a first cavity and a second cavity that communicate with each other, and the inlet of the first cavity is connected to the air inlet. 8 . communication, the outlet of the second cavity is communicated with the air outlet; The box body is provided with a plurality of filter element installation holes corresponding to the first cavity, and the composite filter element is installed in the filter element installation holes in a one-to-one correspondence, so that the gas to be purified enters from the air inlet. , flows through the second cavity after passing through the composite filter element, and is discharged from the air outlet. 8 . The volatile organic compound purification device according to claim 7 , wherein the composite filter element comprises a handle cover plate and an end cover sealing plate arranged oppositely, and the composite filter element is embedded in the filter cavity; 9 . The handle cover is sealed with the box body, the end cover sealing plate is provided with a ventilation hole, or the handle cover is provided with a ventilation hole, and the end cover sealing plate is sealed to allow the gas to be purified. After passing through the composite filter element, it flows into the second cavity through the ventilation hole. 9 . The device for purifying volatile organic compounds according to claim 6 , wherein the filter cavity comprises a first filter cavity, a second filter cavity and a gas flow cavity, the first filter cavity and the The second filter cavity is located on both sides of the gas flow cavity and communicated with the gas flow cavity respectively. The inlet of the first filter cavity and the inlet of the second filter cavity are both connected to the intake air. The outlet of the first filter cavity and the outlet of the second filter cavity are both communicated with the inlet of the gas circulation cavity, and the outlet of the gas circulation cavity is communicated with the air outlet; The box body is provided with a plurality of filter element installation holes, a filter element guide rail is arranged below the filter element installation hole, the composite filter element is installed in the filter element installation hole through the filter element guide rail, and the filter element installation holes can be respectively connected with the filter element installation holes. The first filter cavity corresponds to the second filter cavity, and the composite filter elements are installed in the filter element installation holes in one-to-one correspondence, so that the gas to be purified enters from the air inlet and passes through the composite filter element. Then, it flows through the gas flow cavity and is discharged from the gas outlet. 10. The volatile organic compound purification device according to claim 6, wherein the purification device further comprises a controller, a sensor and an alarm device; Both the sensor and the alarm device communicate with the controller, the sensor is arranged in the filter cavity and is located at the gas outlet end of the composite filter element, and is used to output a signal representing the pressure drop difference in the filter cavity , the controller is used to control the state of the alarm device according to the output signal of the sensor.