CN215505969U

CN215505969U - Gas filtering equipment and purification system

Info

Publication number: CN215505969U
Application number: CN202122277411.3U
Authority: CN
Inventors: 李凡麟; 缪毅; 洪亲付
Original assignee: Hunan Liyu New Energy Technology Co ltd
Current assignee: Hunan Liyu Environmental Protection Energy Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-01-14
Anticipated expiration: 2031-09-18

Abstract

The utility model provides a gas filtering device and a purifying system. The gas filtering equipment comprises a dehydrating device, a filtering device and a gas passing channel; the filter device comprises a filter device shell and a filter assembly arranged in the filter device shell; the dehydration device is communicated with the filtering device through a gas passage. Dewatering device and filter equipment have mutually independent operation space, are convenient for expand, maintain, change operation such as to dehydration subassembly or filter assembly alone, consequently can promote the filterable effect of gas dehydration, can reduce holistic maintenance cost simultaneously.

Description

Gas filtering equipment and purification system

Technical Field

The utility model relates to the field of gas filtration, in particular to gas filtration equipment and a purification system.

Background

The emission of coal mine gas in China is at the top of the world, and the emission of a large amount of low-concentration gas (coal mine coal bed gas with the concentration of 3% -25% is called low-concentration gas) wastes precious clean energy and also aggravates the influence of global warming effect.

Gas power generation is the best way for utilizing low-concentration gas in a coal mine, and at present, the gas power generation mainly has 3 modes: the power generation of a high-power gas turbine, the power generation of a steam turbine and the power generation of a reciprocating piston type internal combustion engine set. The steam turbine has long one-time investment in large station building period, requires sufficient gas flow, and is only suitable for large mines with large gas extraction quantity and stable gas components. The thermal efficiency of the gas turbine is not more than 30%, and the thermal efficiency of the steam turbine is lower, only about 10%. The power generation heat efficiency of the advanced internal combustion engine at home and abroad can reach about 40 percent. The internal combustion engine set is used for generating electricity, one-time investment is low, the station building period is short, the number and the power range of the internal combustion engine set can be determined according to the size of gas volume, the power station is convenient to move, and the system is very suitable for large, medium and small coal mines. Therefore, the internal combustion engine set is the best way for solving the utilization of low-concentration gas at present.

One of the main reasons affecting the power generation start-up rate and reliability of the internal combustion engine unit is the existence of water vapor and dust in the dense gas. The water vapor in the low-concentration gas can cause the power fluctuation of the engine, the efficiency of the engine is reduced, the water vapor and other acidic substances can corrode the engine per se, the service life of the engine is shortened, even accidents such as cylinder scuffing, machine halt and the like are caused, and the operation reliability of the engine is reduced. Meanwhile, the dust enters the engine, mechanical abrasion is increased, equipment such as an intercooler of the engine is blocked, and the service life of the engine is shortened. The existing equipment for dehydrating and filtering low-concentration gas generally concentrates two functions of dehydration and filtration in one working space, and due to the limitation of structural space, the dehydration component and the filtration component are not easy to expand, maintain or replace, so that the efficiency of dehydration and filtration is not high.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a gas filtering apparatus and a purifying system to overcome the disadvantages of the prior art.

The utility model provides the following technical scheme:

a gas filtering device is used for dehydrating and filtering gas and comprises a dehydrating device, a filtering device and a gas passing channel;

the filter device comprises a filter device shell and a filter assembly arranged in the filter device shell;

the dehydration device shell is provided with an air inlet and a dehydration air outlet, and the air inlet and the dehydration air outlet are positioned at two sides of the dehydration component; the filtering device shell is provided with a filtering air inlet and an air outlet, and the filtering air inlet and the air outlet are positioned at two sides of the filtering component; the dehydration air outlet is communicated with the filtration air inlet through the air passing channel.

As a further optional scheme for the gas filtering apparatus, a first connecting assembly is arranged in the dehydration device housing, the dehydration assembly is detachably connected with the first connecting assembly, and a first cover body is further detachably arranged at one end of the dehydration device housing.

As a further optional scheme for the gas filtering device, one end of the dehydration device shell, which is far away from the first cover body, is provided with a first liquid level detection mechanism and a first automatic drainage mechanism, and the first liquid level detection mechanism and the first automatic drainage mechanism are used for detecting the water level of condensed and concentrated water in the dehydration device shell and automatically discharging the condensed and concentrated water.

As a further optional scheme for the gas filtering device, a second connecting assembly is arranged in the filtering device shell, the filtering assembly is detachably connected with the two connecting assemblies, and a second cover body is detachably arranged at one end of the filtering device shell.

As a further optional solution to the gas filtering apparatus, the filter assembly includes at least one filter element unit, the second connecting assembly includes a mounting element and a reinforcing element, an outer edge of the mounting element is fixedly connected to an inner wall of the filter housing, the reinforcing element is movably mounted on a side of the mounting element close to the second cover, and the mounting element and the reinforcing element are used for mounting and reinforcing the filter element unit.

As right further optional scheme of gas filtration equipment, be equipped with at least one mounting hole on the installation component, the reinforcing element is in the air vent has still been seted up to the mounting hole relevant position, filter core unit one end is provided with annular chimb, annular chimb set up in the reinforcing element with between the installation component, the reinforcing element with the installation component is used for right the annular chimb carries out the centre gripping, in order to right the filter core unit is fixed.

As a further optional scheme for the gas filtering device, the filter element unit comprises an outer layer framework, a filter cloth and an inner layer framework, the filter cloth is arranged between the outer layer framework and the inner layer framework, and the outer layer framework and the inner layer framework are used for supporting and protecting the filter cloth.

As a further optional scheme of the gas filtering apparatus, one end of the filtering device casing, which is far away from the second cover body, is provided with a second liquid level detection mechanism and a second automatic drainage mechanism, and the second liquid level detection mechanism and the second automatic drainage mechanism are used for detecting the water level of condensed and concentrated water in the filtering device casing and automatically draining the condensed and concentrated water.

As a further optional scheme for the gas filtering device, a first air pressure detection mechanism is arranged on the gas inlet, a second air pressure detection mechanism is arranged on the gas passage, and a third air pressure detection mechanism is arranged on the gas outlet.

The utility model also provides a purification system comprising the gas filtering equipment.

The embodiment of the utility model has the following advantages:

the dehydration device and the filtering device have mutually independent working spaces, and the dehydration component or the filtering component can be conveniently and independently expanded, maintained, replaced and the like, so that the gas filtering equipment can improve the effect of dehydrating and filtering the gas, and simultaneously can reduce the overall maintenance cost.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible and comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of the gas filtering apparatus according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the dewatering device according to an embodiment of the present application;

FIG. 3 is a schematic diagram of the first connection assembly according to an embodiment of the present application;

FIG. 4 is a schematic diagram of the filter apparatus according to an embodiment of the present application;

FIG. 5 shows an enlarged partial schematic view of FIG. 4;

FIG. 6 is a schematic view of the mounting member of an embodiment of the present application;

fig. 7 shows a schematic view of the filter cartridge unit according to an embodiment of the present application.

Description of the main element symbols:

100-a dewatering device; 200-a filtration device; 300-a gas passage; 400-a first air pressure detection mechanism; 500-a second air pressure detection mechanism; 600-a third air pressure detection mechanism; 700-a gas filtration device; 110-a dehydration engine housing; 120-a dewatering component; 130-a first connection assembly; 111-an air inlet; 112-dehydration air outlet; 113-a first cover; 114-a first liquid level detection mechanism; 115-a first automatic drainage mechanism; 116-a first support leg; 117-eye bolt; 131-a first connection block; 210-a filter housing; 220-a filter assembly; 230-a second connection assembly; 211-filtration air intake; 212-air outlet; 213-a second cover; 214-a second liquid level detection mechanism; 215-a second automatic drainage mechanism; 216-a second support foot; 221-a cartridge unit; 221 a-annular rim; 221 b-outer layer skeleton; 221 c-inner layer skeleton; 221 d-filter cloth; 221 e-elastomeric gasket; 231-a mounting element; 231 a-mounting hole; 232-a reinforcement element; 232 a-vent.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example one

Referring to fig. 1, an embodiment of the present application provides a gas filtering apparatus 700. The gas filtering apparatus 700 is used for dehydration filtering of gas, especially a low concentration gas. The gas filtering apparatus 700 can improve the effect of dehydrating and filtering the gas.

The gas filtering apparatus 700 includes a dehydration device 100, a filtering device 200, and a gas passing channel 300, wherein the dehydration device 100 and the filtering device 200 are independent of each other and are communicated through the gas passing channel 300. After the gas is subjected to water-vapor separation by the dehydration device 100, the gas enters the filtering device 200 through the gas passage 300, and the filtering device 200 continues to perform dust filtration on the gas.

Further, the dehydration device 100 includes a dehydration device housing 110 and a dehydration module 120 disposed inside the dehydration device housing 110. The dehydration module 120 is the main functional component for the water-vapor separation of the gas.

Meanwhile, the filter device 200 includes a filter device housing 210 and a filter assembly 220 disposed inside the filter device housing 210. The filter assembly 220 is the main functional component for dust filtration of the gas.

Further, the dewatering device housing 110 is provided with an air inlet 111 and a dewatering air outlet 112, and the air inlet 111 and the dewatering air outlet 112 are located at two sides of the dewatering component 120; meanwhile, the filtering device case 210 is provided with a filtering air inlet 211 and an air outlet 212, and the filtering air inlet 211 and the air outlet 212 are located at both sides of the filtering assembly 220. The air passage 300 is specifically communicated with the dehydration air outlet 112 and the filtration air inlet 211.

In this embodiment, the gas flow path is as follows: enters the dewatering device shell 110 from the air inlet 111, is subjected to water vapor separation by the dewatering component 120, enters the air passing channel 300 from the dewatering air outlet 112, then flows through the air passing channel 300, enters the filtering device shell 210 from the filtering air inlet 211, and finally flows out from the air outlet 212 after being subjected to dust filtration by the filtering component 220.

Example two

Referring to fig. 1 to 7, the present embodiment provides a gas filtering apparatus 700, wherein the gas filtering apparatus 700 is used for dewatering and filtering gas, especially low-concentration gas. The present embodiment is an improvement on the technology of the first embodiment, and compared with the first embodiment, the difference is that:

referring to fig. 2, a first connecting assembly 130 is disposed in the dewatering device housing 110. The first connecting component 130 is fixedly connected to the inner wall of the dewatering device housing 110, and is configured to be detachably connected to the dewatering component 120. Meanwhile, a first cover 113 is detachably disposed at one end of the dehydration device housing 110 to facilitate the taking out and putting in of the dehydration module 120. This design facilitates the disassembly, cleaning, or replacement and maintenance of the dewatering assembly 120, which greatly improves the filtration efficiency of the dewatering device 100 in this embodiment and reduces the maintenance cost.

In some specific embodiments, the dewatering device housing 110 is preferably a cylindrical structure with an opening at one end, the dewatering device housing 110 is vertically placed with the opening facing upwards, the bottom of the dewatering device housing 110 is an elliptical spherical surface (not shown), and the elliptical spherical surface is further provided with a first supporting leg 116 for supporting and placing the dewatering device housing 110. The ellipsoidal surface facilitates condensation and aggregation of water after water-vapor separation by the dehydration module 120.

Further, the first cover 113 is specifically located at one end of the opening, the dewatering device 100 is further provided with a plurality of lifting bolts 117, and the lifting bolts 117 penetrate through the first cover 113 to be in threaded connection with the dewatering device housing 110. The first cover 113 can be detached and attached by tightening and loosening the eye bolt 117. The eyebolt 117 is preferably 4 in this embodiment.

Referring specifically to fig. 3, in some embodiments, the first connection assembly 130 includes a plurality of first connection blocks 131. One end of the first connecting block 131 is fixedly connected to the dewatering device housing 110, a plurality of the first connecting blocks 131 are uniformly arranged on the same horizontal plane, and the number of the first connecting blocks 131 is preferably 4 in this embodiment. The first connecting block 131 and the dehydration device housing 110 may be fixedly connected by welding, riveting, or the like, and in this embodiment, welding is preferred.

Further, the outer contour of the dewatering element 120 is slightly smaller than the inner contour of the dewatering device housing 110, and the dewatering element 120 is put into the opening above the dewatering device housing 110 and falls on the plurality of first connecting blocks 131. Due to the self-gravity of the dewatering assembly 120, the positioning and fixing in the dewatering device housing 110 can be realized, and the convenience of the dewatering assembly 120 in detachment is better improved. Meanwhile, since the outer contour of the dehydration module 120 is only slightly smaller than the inner contour of the dehydration device shell 110, the gas can completely pass through the dehydration module 120, and the efficiency of the dehydration device 100 for water-vapor separation is improved.

In some embodiments, the dewatering assembly 120 is preferably a wire mesh demister, the wire mesh demister is selected according to HG/T21618-1998 standard, stainless steel wire is used as the material, and the dewatering rate can reach more than 98%.

Referring to fig. 2, in some embodiments, a first liquid level detecting mechanism 114 and a first automatic drainage mechanism 115 are disposed on a side of the dewatering device housing 110 away from the first cover 113. The first liquid level detection mechanism 114 and the first automatic drainage mechanism 115 can detect the water level of the condensed and concentrated water at the bottom of the dehydration device shell 110 and automatically drain the condensed and concentrated water, so as to ensure that the water-vapor separation efficiency of the dehydration device 100 is not affected.

Referring to fig. 4, a second connecting component 230 is disposed in the filtering device housing 210. The second connecting assembly 230 is fixedly connected to the inner wall of the filter housing 210, and is detachably connected to the filter assembly 220. Meanwhile, a second cover 213 is detachably disposed at one end of the filter housing 210 to facilitate the taking out and putting in of the filter assembly 220. Due to the design, the filter assembly 220 can be conveniently detached, cleaned or replaced for maintenance, so that the filtering efficiency of the filtering device 200 in the embodiment can be greatly improved, and the maintenance cost is reduced.

In some specific embodiments, the filtering device housing 210 is preferably a cylindrical structure with an opening at one end, the filtering device housing 210 is vertically placed with the opening facing upward, the bottom of the filtering device housing 210 is an elliptical spherical surface (not shown), and the elliptical spherical surface is further provided with a second supporting leg 216 for supporting and placing the filtering device housing 210. The ellipsoidal surface facilitates condensation concentration of excess water within the filter housing 210.

Further, the second cover 213 is specifically located at one end of the opening, the filtering apparatus 200 is further provided with a plurality of eyebolts 117, and the eyebolts 117 penetrate through the second cover 213 to be in threaded connection with the filtering apparatus casing 210. The second cover 213 can be detached and attached by tightening and loosening the eye bolt 117. The eyebolt 117 is preferably 4 in this embodiment.

Referring specifically to fig. 5, in some embodiments, the filter assembly 220 includes at least one filter element unit 221; meanwhile, the second connecting member 230 includes a mounting member 231 and a reinforcing member 232. The mounting element 231 is fixedly connected to the inner wall of the filter housing 210, and the reinforcing element 232 is movably mounted on the mounting element 231 at one side of the second cover 213. After the installation member 231 is installed and positioned on the filter element unit 221, the reinforcing member 232 further reinforces the filter element unit 221. Due to the design, the number of the filter element units 221 in the embodiment is multiple, the filter area of the filter assembly 220 is greatly increased by the multiple filter element units 221, the dust filtering efficiency of the filter device 200 is further improved, and the cleaning period of the filter device is longer. In this embodiment, the filter element units 221 are preferably 19 and are uniformly arranged.

Further, the outer contour of the mounting element 231 matches with the inner contour of the filter device housing 210, and the outer edge of the mounting element 231 is fixedly connected with the inner wall of the filter device housing 210, and the fixed connection between the mounting element and the inner wall is sealed, so that the situation that the gas does not pass through the filter element unit 221 and the dust filtering effect is affected is avoided. The outer edge of the mounting element 231 may be riveted, welded, etc. to the inner wall of the filter housing 210, and in this embodiment, welding is preferred.

Further, referring to fig. 5 and 6, at least one mounting hole 231a is formed in the mounting element 231, and the number of the mounting holes 231a corresponds to the number of the filter element units 221. The filter element unit 221 is of a cylindrical structure and is provided with an annular convex edge 221a at one end, the annular convex edge 221a protrudes out of the body of the filter element unit 221 along the radial direction of the filter element unit 221, the filter element unit 221 is far away from one end of the annular convex edge 221a, the end of the annular convex edge 221a is close to one side of the second cover body 213 and penetrates through the installation hole 231a, and the outline of the annular convex edge 221a is larger than that of the installation hole 231 a. Subsequently, the reinforcing member 232 is movably connected to the mounting member 231 to clamp the annular flange 221a by the reinforcing member 232 and the mounting member 231, so as to ensure the sealing between the reinforcing member 232, the annular flange 221a and the mounting member 231.

Further, the reinforcing element 232 is provided with a vent hole 232a at a position corresponding to the mounting hole 231 a. The profile of the vent hole 232a is smaller than the outer profile of the annular rim 221a as a whole, so that the gas can be discharged from the vent hole 232a after being filtered by the filter element unit 221.

Referring to fig. 7, in some embodiments, an elastic gasket 221e is further disposed on the filter cartridge unit 221 on a side of the annular flange 221a close to the mounting element 231, so as to better achieve the sealing property among the reinforcing element 232, the annular flange 221a and the mounting element 231.

In some specific embodiments, the reinforcing element 232 is movably connected to the mounting element 231 by a threaded connection, so that the reinforcing element 232 and the mounting element 231 have a certain pre-tightening force for clamping the annular flange 221a by the threaded connection.

Referring to fig. 7, the filter element unit 221 includes an outer layer frame 221b, a filter cloth 221d and an inner layer frame 221c, and the filter cloth 221d is located between the outer layer frame 221b and the inner layer frame 221 c. The outer layer framework 221b and the inner layer framework 221c can support and protect the filter cloth 221d positioned therebetween, so that the filter element unit 221 is not easily deformed and damaged in the processes of disassembly, assembly and cleaning.

In some specific embodiments, the outer layer framework 221b and the inner layer framework 221c are made of stainless steel materials, and the filter cloth 221d is made of 5-10um sintered stainless steel materials; at this time, the outer skeleton 221b, the inner skeleton 221c, and the filter cloth 221d may be connected by welding. In this embodiment, the grades of the stainless steel materials of the outer layer skeleton 221b, the inner layer skeleton 221c and the filter cloth 221d are preferably 304.

Referring to fig. 4, in some embodiments, a second liquid level detecting mechanism 214 and a second automatic drainage mechanism 215 are disposed on a side of the filter housing 210 away from the second cover 213. The second liquid level detection mechanism 214 and the second automatic drainage mechanism 215 can detect the water level of the condensed and concentrated water at the bottom of the filtering device housing 210 and automatically drain the condensed and concentrated water, so as to ensure that the dust filtering efficiency of the filtering device 200 is not affected.

Referring to fig. 1, in some embodiments, a first air pressure detecting mechanism 400 is disposed on the air inlet 111, a second air pressure detecting mechanism 500 is disposed on the air passage 300, and a third air pressure detecting mechanism 600 is disposed on the air outlet 212. In the operation of the gas filtering apparatus 700 of this embodiment, it can be determined whether the dewatering assembly 120 and the filtering assembly 220 need to be cleaned or replaced by determining the pressure difference between the first pressure detecting mechanism 400 and the second pressure detecting mechanism 500 and the pressure difference between the second pressure detecting mechanism 500 and the third pressure detecting mechanism 600. The frequency of cleaning the dewatering assembly 120 and the filter assembly 220 may be different.

The embodiment further provides a purification system, in particular to a low-concentration gas purification system, comprising the gas filtering device 700.

In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. The gas filtering equipment is characterized by being used for dehydrating and filtering gas and comprising a dehydrating device, a filtering device and a gas passing channel;

2. The gas filtering apparatus of claim 1, wherein a first connection assembly is disposed within the dehydration device housing, the dehydration assembly being detachably connected to the first connection assembly, and a first cover is further detachably disposed at one end of the dehydration device housing.

3. The gas filtering device according to claim 2, wherein a first liquid level detecting mechanism and a first automatic draining mechanism are disposed at an end of the dehydration device housing away from the first cover body, and are used for detecting the water level of the condensed water collected in the dehydration device housing and automatically draining the condensed water.

4. The gas filtering apparatus according to claim 1, wherein a second connecting assembly is disposed in the filter device housing, the filter assembly is detachably connected to the second connecting assembly, and a second cover is detachably disposed at one end of the filter device housing.

5. The gas filtering device according to claim 4, wherein the filter assembly comprises at least one filter element unit, the second connecting assembly comprises a mounting element and a reinforcing element, the outer edge of the mounting element is fixedly connected with the inner wall of the filter device shell, the reinforcing element is movably mounted on one side of the mounting element close to the second cover body, and the mounting element and the reinforcing element are used for mounting and reinforcing the filter element unit.

6. The gas filtering device according to claim 5, wherein the mounting member has at least one mounting hole, the reinforcing member has a vent hole at a corresponding position of the mounting hole, one end of the filter cartridge unit has an annular flange, the annular flange is disposed between the reinforcing member and the mounting member, and the reinforcing member and the mounting member are used for clamping the annular flange to fix the filter cartridge unit.

7. The gas filtering device as claimed in claim 5, wherein the filter element unit comprises an outer layer framework, a filter cloth and an inner layer framework, the filter cloth is arranged between the outer layer framework and the inner layer framework, and the outer layer framework and the inner layer framework are used for supporting and protecting the filter cloth.

8. The gas filtering apparatus according to claim 4, wherein a second liquid level detecting mechanism and a second automatic draining mechanism are disposed at an end of the filtering device housing away from the second cover body, for detecting the liquid level of the condensed water collected in the filtering device housing and automatically draining the condensed water.

9. The gas filtering device according to claim 1, wherein a first air pressure detecting mechanism is provided on the air inlet, a second air pressure detecting mechanism is provided on the air passage, and a third air pressure detecting mechanism is provided on the air outlet.

10. A purification system, characterized by: comprising a gas filtration device according to any one of claims 1-9.