CN209727584U - A kind of two-stage multichannel atmosphere collection tube road filtration system - Google Patents

Abstract

The utility model relates to the technical field of pre-filtering for atmospheric online analysis, and discloses a two-stage multi-channel air collection pipeline filter system, which includes a multi-channel filter unit, and the multi-channel filter unit includes a filter group with multiple filter cavities , each filter cavity is provided with a solenoid valve; each solenoid valve independently controls the opening and closing sequence of the solenoid valve and the switching time interval of the solenoid valve through the controller, so that when one solenoid valve is in the open state, the rest are in the closed state. The multi-channel filter unit is equipped with a pre-cyclone filter device to remove large particle pollutants and liquid water in the gas sample. The utility model avoids the attenuation effect of the high-frequency signal of the gas concentration, and at the same time, doubles the effective filtration time of the pre-filter system of the gas analyzer, and avoids the damage of the instrument caused by the liquid water in the gas sample entering the instrument, greatly prolonging the Analyzing the continuous operation time of the instrument improves the quality of field observation.

Description

A Two-Stage Multi-Channel Atmospheric Acquisition Pipeline Filtration System

technical field

The utility model relates to the technical field of pre-filtering for atmospheric online analysis, in particular to a two-stage multi-channel atmospheric collection pipeline filtering system.

Background technique

In the scientific research or observation of ecology, environmental science, geology and other related fields, it is often necessary to use fast-response instruments to detect trace and trace gas components in the atmosphere (such as the concentration of CO ₂ , CH ₄ , N ₂ O in the atmosphere and Related isotope ratios, etc.) for continuous online analysis and monitoring. At present, such instruments for the determination of trace and trace gas components in the atmosphere mostly use laser technology. In order to improve the sensitivity of trace gas determination, it is necessary to transport the gas sample into a specific measurement chamber through pipelines to increase the optical path and reduce interference. This type of online analyzer based on laser measurement technology is very sensitive to solid particles and liquid water entering the chamber when measuring trace gas components, and the presence of liquid water will cause damage to some parts of the instrument.

At present, a pre-filtration system is often used to filter the gas before it enters the chamber, so as to keep the chamber clean enough to achieve the precision and accuracy of the measurement.

The existing pre-filtration system mainly adopts a cylindrical filter or a multi-stage plate-type membrane-changing filtration system. Cartridge filter is to place a cylindrical filter element in the filter cartridge, the gas enters from the center of the filter element, passes through the inner surface of the filter element, reaches the space between the outer surface of the filter element and the filter cartridge, and is collected and discharged. The cylindrical filter can increase the contact area between the gas and the filter element, thereby prolonging the effective filtration time of solid particles. When installing a multi-stage plate-type membrane-changing filtration system in the pipeline, compared with single-stage filtration, increasing the number of membrane filtration stages will improve the filtration efficiency to a certain extent.

However, the increase in the number of membrane filtration stages will increase the air resistance of the pipeline. As the running time increases, the air resistance will become larger and larger, making it difficult to maintain a stable air pressure in the chamber, resulting in an increase in the frequency of cleaning and maintenance; the filter chamber of the cylindrical filter The volume is often large, which will cause the gas mixing process, which will lead to the attenuation of the high-frequency signal of the collected gas concentration.

Utility model content

Based on the above problems, the utility model provides a two-stage multi-channel air collection pipeline filtration system. The attenuation effect of the high-frequency signal of the collected gas concentration becomes larger; at the same time, the effective filtration time of the multi-channel filter unit is doubled, which effectively reduces the frequency of replacing the filter membrane and prolongs the continuous operation time of the analytical instrument.

In order to solve the above technical problems, the utility model provides the following technical solutions:

A two-stage multi-channel air collection pipeline filtration system, including a multi-channel filter unit arranged between the gas sampling port and the instrument inlet, the multi-channel filter unit includes a filter group composed of a plurality of filter chambers separated from each other; The filter group is provided with an air inlet pipe and an air outlet pipe. Both the air inlet pipe and the air outlet pipe include a main pipe and a branch pipe corresponding to the filter cavity. The air inlet pipe and the air outlet pipe are respectively It communicates with both sides of each filter cavity of the filter group through the branch pipe; the main pipe of the gas distribution pipe at the inlet end is connected with the gas collection port, and the main pipe of the gas distribution pipe at the gas outlet end is connected with the air inlet of the instrument; the filter group is provided with a solenoid valve group, The solenoid valve group includes a solenoid valve for independently controlling the ventilation or shutoff of each filter chamber; the solenoid valve group is connected with a controller that can control each solenoid valve, and the controller is used to independently control the cycle opening and closing of each solenoid valve, and In a control cycle, when one of the filter chambers is in a state of ventilation, the rest of the filter chambers are in a state of degassing; the control parameters of the controller include the opening and closing sequence of the solenoid valve and the switching time interval of the solenoid valve.

Further, the air inlet or air outlet of each filter chamber is provided with a governor I that can adjust the gas flow rate.

Further, the gas distribution pipe at the inlet end or the gas outlet pipe is provided with a governor 2 that can adjust the gas flow rate, and the governor 2 is located on the main pipe of the air inlet pipe or the main pipe of the gas outlet pipe.

Further, the filter group includes a bottom plate, the filter cavity includes a groove arranged on the bottom plate, a filter membrane is installed in the groove, and a top plate that can seal the groove is arranged on the bottom plate; the bottom plate and the top plate are respectively provided with grooves Connected air ducts, the air ducts are respectively communicated with corresponding shunt branch pipes.

Further, the number of grooves on the bottom plate is 3 to 15, and each groove is provided with a plurality of filter membranes, and the aperture of each filter membrane decreases in turn along the direction of air flow; the filter membrane in each groove and the groove A porous supporting plate is arranged between the bottom of the groove, a lower sealing ring is arranged between the supporting plate and the bottom of the groove, and an upper sealing ring is arranged between the filter membrane and the top plate.

Further, a cyclone filter unit is provided between the air inlet end of the multi-channel filter unit and the gas collection port, the cyclone filter unit includes a cyclone filter, the cyclone filter includes a cylinder, the upper part of the cylinder is provided with a top cover, and the side wall of the cylinder An air inlet pipe connected to the gas extraction port is installed along the tangential direction near the top cover; the bottom of the cylinder is open, and the opening is connected with a conical cylinder connected with the inner cavity of the cylinder, and the large-diameter edge of the conical cylinder is connected with the opening edge of the bottom of the cylinder. Sealed connection, the small diameter end of the conical cylinder is connected with a collection chamber connected with the inner cavity of the conical cylinder; an exhaust cylinder is arranged on the top of the cylinder, and the bottom of the exhaust cylinder passes through the top cover of the cylinder and is located in the inner cavity of the cylinder; One end of the air cylinder positioned above the top cover communicates with the main pipe of the air inlet branch pipe.

Further, a pipeline 1 is connected between the intake pipe and the exhaust cylinder of the cyclone filter through three-way valve one and three-way valve two respectively.

Further, the main pipe of the air distribution pipe at the inlet end is connected to the pipeline two through the three-way valve three, and the end of the pipeline two far away from the three-way valve three is connected with the main pipe of the air distribution pipe at the air outlet end, and the pipeline two is provided with a monomer filter device.

Further, the pipeline 2 is provided with a governor 1 which can adjust the gas flow rate.

Compared with the prior art, the beneficial effect of the utility model is that the utility model adopts a multi-channel filter unit composed of a plurality of independent filter cavities to filter the particulate matter in the gas, and a controller is used to sequentially switch the electromagnetic filter of the filter cavity when filtering. The valve opens and closes to realize the filtering of a single filter cavity in sequence, which avoids the problem that the large volume of the filter cavity is easy to generate gas mixing, which leads to the increase of the attenuation effect of the high-frequency signal of the collected gas concentration, and at the same time makes the filter cavity of the multi-channel filter unit filter independently in sequence , so that the filtration time is doubled, which effectively reduces the frequency of replacing the filter membrane and prolongs the continuous operation of the analytical instrument. At the same time, the setting of the cyclone filter unit also effectively avoids the problem that the liquid water in the air enters the instrument and causes damage to the instrument.

Description of drawings

Fig. 1 is the structural representation of the two-stage multi-channel atmospheric collection pipeline filter system of embodiment 1 and 2;

Fig. 2 is the connection schematic diagram of embodiment 1 air intake end air distribution pipe, air outlet end air distribution pipe and filter group;

Fig. 3 is the structural representation of embodiment 1 filter group;

Fig. 4 is the structural representation of embodiment 1 cyclone filter;

Fig. 5 is the top view of embodiment 1 cyclone filter;

Fig. 6 is the figure that the methane concentration that the LGR fast methane analyzer in embodiment 2 detects in 30 days changes with time;

Fig. 7 is the figure that the optical cavity ring-down time of LGR quick methane analyzer record in embodiment 2 changes with time in 30 days;

Fig. 8 is the figure that the optical cavity air pressure of LGR fast methane analyzer 30 days record changes with time in embodiment 2;

Fig. 9 is the figure that the optical cavity temperature of LGR fast methane analyzer records in 30 days in embodiment 2 changes with time;

Among them: 1. Gas sampling port; 2. Instrument air inlet; 3. Multi-channel filter unit; 4. Filter cavity; 5. Filter group; 6. Air inlet pipe; 7. Air outlet pipe; Valve block; 9. Solenoid valve; 10. Controller; 11. Governor one; 12. Governor two; 13. Bottom plate; 14. Groove; 15. Filter membrane; 16. Top plate; 17. Air duct; 18. Support plate; 19. Lower sealing ring; 20. Upper sealing ring; 21. Cyclone filter unit; 22. Cyclone filter; 23. Cylinder; 24. Air intake pipe; 27, exhaust cylinder; 28, three-way valve one; 29, three-way valve two; 30, pipeline one; 31, three-way valve three; 32, pipeline two; 33, monomer filter.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the examples and accompanying drawings. The schematic implementation of the utility model and its description are only used to explain the utility model Novelty, not as a limitation to the utility model.

Example 1:

Referring to Figures 1-3, a two-stage multi-channel air collection pipeline filtration system includes a multi-channel filter unit 3 arranged between the gas sampling port 1 and the instrument inlet 2, and the multi-channel filter unit 3 consists of 8 mutual A filter group 5 composed of separate filter chambers 4; the filter group 5 is provided with an air inlet pipe 6 and an air outlet pipe 7, and both the air inlet pipe 6 and the air outlet pipe 7 include a main pipe and a filter chamber 4 Corresponding branch pipes, air inlet pipe 6 and air outlet pipe 7 communicate with both sides of each filter chamber 4 of filter group 5 through branch pipes respectively; Connected, the main pipe of the air outlet pipe 7 communicates with the instrument inlet 2; the filter group 5 is provided with a solenoid valve group 8, and the solenoid valve group 8 includes a solenoid valve 9 for independently controlling each filter cavity 4 to ventilate or shut off; The solenoid valve group 8 is connected with a controller 10 that can control each solenoid valve 9, and the controller 10 is used to independently control the cycle opening and closing of each solenoid valve 9, and in one control cycle, one of the filter chambers 4 is in the ventilation mode. state, the rest of the filter chambers 4 are in the cut-off state; the control parameters of the controller 10 include the opening and closing sequence of the solenoid valve 9, and the switching time interval of the solenoid valve 9.

In this embodiment, after the atmosphere enters the filter chamber 4 through the gas sampling port 1, the particulate matter therein is filtered, and the filtered gas enters the analyzer for analysis. The controller 10 controls the opening and closing of the solenoid valve 9, including the opening and closing of the solenoid valve 9. Closing sequence, solenoid valve 9 switching time interval and number of cycles, so that when one of the filter chambers 4 is in a ventilated state, the rest of the filter chambers 4 are all in a gas-off state; when the collected air enters the multi-channel filter unit 3, only one The filter chamber 4 is in a ventilated state to filter the atmosphere, effectively reducing the volume of the filter chamber 4, and avoiding the large volume of the filter chamber 4, which is easy to generate gas mixing and cause the attenuation effect of the high-frequency signal of the collected gas concentration to become larger At the same time, multiple independent filter chambers 4 are recycled, and if any channel has a problem, it will not affect other channels, and the data loss time is greatly reduced; the effective filtration time of the multi-channel filter unit 3 is doubled, effectively reducing the need for replacement The frequency of filter membrane 15 prolongs the continuous operation time of the analytical instrument.

The air inlet or outlet of each filter chamber 4 is provided with a governor-11 that can adjust the gas flow rate. Due to the small differences in the length of the pipelines of different filter chambers 4 and the air resistance of components, etc., it may lead to switching tubes. Changes in air pressure in the instrument while traveling. By increasing the governor-11 at each filter chamber 4, it is used to regulate the airflow velocity of each filter chamber 4, so that the air resistance in each filter chamber 4 is consistent, to eliminate the air resistance difference of each filter chamber 4. In the embodiment, the speed governor-11 is arranged on the branch pipe of the air distribution pipe 7 at the air outlet end, so as to realize the adjustment of the airflow velocity of each filter cavity 4, so that the air resistance in each filter cavity 4 is consistent, so as to eliminate the air flow of each filter cavity 4. On the basis of not deviating from the essential content of the present utility model, the governor-11 is arranged on the branch pipe of the gas distribution pipe 6 at the intake end, and can also realize the purpose of adjusting the airflow velocity so as to eliminate the air resistance difference of each filter cavity 4 .

The gas distribution pipe 6 at the inlet end or the gas distribution pipe 7 at the outlet end is provided with a governor 2 12 that can adjust the gas flow rate. In order to control and adjust the air pressure entering the analyzer, the atmosphere entering the analyzer can meet the stable air velocity required for detection. In the embodiment, the governor 2 12 is arranged on the main pipe of the air inlet pipe 6 or the main pipe of the air outlet pipe 7, so as to adjust the air pressure entering the analyzer so as to stabilize the airflow velocity entering the analyzer without deviating from On the basis of the essential content of the present utility model, the governor 2 12 can also be arranged at any position on the main road of the filtration system, so that the airflow entering the filtration system or entering the instrument is firstly regulated by the governor 2 12, which can also realize The purpose of adjusting the air pressure entering the analyzer to stabilize the airflow velocity entering the analyzer.

Referring to Fig. 1 and Fig. 3, filter group 5 comprises bottom plate 13, filter chamber 4 comprises the groove 14 that is arranged on the bottom plate 13, and filter membrane 15 is installed in the groove 14, and bottom plate 13 is provided with and can seal groove 14. The top plate 16; the bottom plate 13 and the top plate 16 are respectively provided with air guide tubes 17 communicating with the grooves 14, and the air guide tubes 17 are respectively communicated with corresponding branch pipes. The number of grooves 14 on the bottom plate 13 is 8, and a plurality of filter membranes 15 are arranged in each groove 14, and the aperture of each filter membrane 15 decreases successively along the airflow direction; the filter membrane 15 in each groove 14 A porous support plate 18 is disposed between the bottom of the groove 14 , a lower sealing ring 19 is disposed between the support plate 18 and the bottom of the groove 14 , and an upper sealing ring 20 is disposed between the filter membrane 15 and the top plate 16 . The filter membrane 15 whose pore size is successively reduced along the airflow direction avoids the problem of clogging caused by using a single pore size filter membrane 15 for filtration, and improves the filtration efficiency of tiny particles at the same time; the setting of the support plate 18 can reduce the size of the filter membrane 15 The deformation generated when the gas flows at a high speed prevents the filter membrane 15 from being broken, thereby further ensuring the filtering effect of the membrane filter.

It should be pointed out here that the filtration principle is that under the action of driving force or other external forces, the liquid (or gas) in the suspension (or gas containing solid particles) penetrates the filter medium with fine pores, and the solid particles and other substances are retained by the filter medium. , so that solids and other substances are separated from liquids (or gases). Therefore, on the basis of not departing from the essential content of the present utility model, other filter devices with micropore filter media, such as multiple plate membrane filters or multiple cylindrical filters, can be used as filters with micropore filter media. The device is applied to the utility model.

Referring to Fig. 1, Fig. 4 and Fig. 5, a cyclone filter unit 21 is provided between the air intake end of the multi-channel filter unit 3 and the gas collection port 1, the cyclone filter unit 21 includes a cyclone filter 22, and the cyclone filter 22 includes a cylinder 23 , the upper part of the cylinder 23 is provided with a top cover, and an air inlet pipe 24 communicating with the gas extraction port 1 is installed on the side wall of the cylinder 23 near the top cover along the tangential direction; the bottom of the cylinder 23 is open, and the opening is connected with the cylinder 23 A conical cylinder 25 with a connected inner cavity, the large-diameter edge of the conical cylinder 25 is in sealing connection with the opening edge of the bottom of the cylinder body 23, and the small-diameter end of the conical cylinder 25 is connected with a collection chamber 26 communicating with the inner cavity of the conical cylinder 25; The top of the body 23 is provided with an exhaust tube 27, and the bottom of the exhaust tube 27 passes through the top cover of the cylinder body 23 and is located in the inner cavity of the cylinder body 23; Supervisor connected. The atmosphere carrying particulate matter and liquid water enters the cylinder body 23 from the air inlet pipe 24 along the tangential direction of the inner wall of the cylinder body 23 at a certain speed, and forms a swirling flow in the cylinder body 23; Gradually approach the inner wall of the cylinder 23, and move spirally to the bottom of the cylinder 23 and the conical cylinder 25 under the action of gravity and the downward thrust generated by the external airflow gradually entering the cylinder 23, and finally the large particles and liquid water Enter the collection chamber 26; the purified air flow bounces up through the side wall of the conical cylinder 25 and moves upward, and is discharged by the exhaust cylinder 27 to realize the separation of gas-liquid and solid; avoiding the blockage of the membrane filtration system by large particles The problem of increasing the air resistance in the pipeline will further prolong the effective operation time of the instrument, reduce the maintenance frequency, and effectively avoid the problems of data interference and instrument damage caused by liquid water entering the subsequent analysis process.

A pipeline 1 30 is connected between the intake pipe 24 and the exhaust cylinder 27 of the cyclone filter 22 through a three-way valve one 28 and a three-way valve two 29 respectively. The setting of the pipeline one 30 can make the intake pipe 24 communicate with the exhaust cylinder 27 through the pipeline one 30 by controlling the three-way valve one 28 and the three-way valve two 29 when the cyclone filter 22 needs to be cleaned, and the cylinder body 23 There is no air flow through the inner cavity, and the cylinder body 23 of the cyclone filter 22, the conical cylinder 25 and the collection chamber 26 can be cleaned.

The main pipe of the gas distribution pipe 6 at the inlet end is connected with a pipeline 2 32 through a three-way valve 3 31, and the end of the pipeline 2 32 away from the three-way valve 3 31 is connected with the main pipe of the gas distribution pipe 7 at the gas outlet end, and the pipeline 2 32 is set There is a single filter. 33 When the multi-channel filter unit 3 needs to be cleaned, adjust the three-way valve three 31 so that the air flow enters the single filter from the pipeline two 32 to ensure the continuous normal operation of the analytical instrument; at this time, the filter group 5 stops running, It is convenient for personnel to change membrane and overhaul.

The pipeline two 32 is provided with a governor one 11 that can adjust the gas flow rate, which can adjust the air flow rate in the single filter, so that the air resistance in each filter cavity 4 is consistent, so as to eliminate the air resistance of each filter cavity 4 The difference in air resistance ensures that the flow rate of the filter channel of the filter group 5 is consistent, and ensures that when switching to the single filter for filtering, the analyzer detection data will not fluctuate greatly.

Example 2:

The methane flux observation experiment was carried out in the reed flat in Yueyang, Hunan Province. The gas extraction pump was an Edwards vacuum pump (XDS-35i, Edward, MA, USA). The analyzer and vacuum pump were powered by 220V mains power. Gator Research Ltd.) installed the system at the air inlet.

In this embodiment, the number of filter chambers 4 of the two-stage multi-channel air collection pipeline filter system is 8, and the controller 10 controls each solenoid valve 9 to be independently opened for 1 hour, and then switches to the next solenoid valve 9 in turn. , and cycle open and close.

Through observation, in the original single-channel plate filter with multi-stage filter membrane, the pollution of the pipeline is extremely serious, and the filter device needs to be replaced in about a week. The problem of chamber contamination is serious, and the cleaning of the pipeline and the internal mirror of the instrument is time-consuming and labor-intensive, and a large amount of data is lost.

However, the trial operation of the system is carried out in front of the air inlet of the LGR fast methane analyzer, and the uninterrupted operation time of the instrument is greatly extended. As shown in Figure 6, the system has been running continuously for 33 days in Yueyang Beach, Hunan Province (during this period, there were 3 mains power outages, and the power outages were instantaneous at 15:35 on July 30, and from 4:30 on July 31 to 15:37, 5:55-13:07 on August 14th, the analyzer and the system will start automatically after power-on), the system and the LGR fast methane analyzer are in good operating condition. During the flooding period of the beach, the methane concentration remained at 2-8ppm, and the diurnal variation was significant, and it was significantly regulated by the flooding. The cleanliness of the optical cavity of the LGR fast methane analyzer was very stable. As shown in Figure 7, except that the ring-down time of the optical cavity dropped from 5.6 μs to 5.1 μs during the first power-off and restart (because a small amount of pollutants accumulated in the instrument pipeline were separated from the inner wall at the moment the pump was turned on and polluted the high-reflection mirror surface) , the instrument has remained around 5.0μs for more than 30 days, and the decline is very slow. As shown in Fig. 8 and Fig. 9, the pressure of the optical cavity is affected by the temperature of the optical cavity, and basically remains between 130-135 Torr. The addition of this system greatly prolongs the normal operation time of the instrument, greatly reduces the manpower and material cost of the maintenance of the LGR fast methane analyzer, and improves the observation efficiency of the atmosphere. The above is the embodiment of the present utility model. The above-mentioned embodiments and the specific parameters in the embodiments are only for clearly expressing the verification process of the utility model, and are not used to limit the scope of protection of the patent of the utility model. The scope of protection of the patent of the utility model is still subject to its claims. The equivalent structural changes made in the specification and accompanying drawings of the utility model should be included in the protection scope of the utility model in the same way.

Claims (9)

1. a kind of two-stage multichannel atmosphere collection tube road filtration system, it is characterised in that: including being set to gas production mouth (1) and instrument Multichannel filter element (3) between air inlet (2), the multichannel filter element (3) include by multiple mistakes being separated from each other The filter group (5) of filter chamber (4) composition；The filter group (5) is provided with inlet end gas-distributing pipe (6) and outlet side gas-distributing pipe (7), the inlet end gas-distributing pipe (6) includes supervisor and shunting corresponding with filter chamber (4) branch with outlet side gas-distributing pipe (7) Pipe, the inlet end gas-distributing pipe (6), outlet side gas-distributing pipe (7) pass through each filtering of shunt pipe and filter group (5) respectively The connection of chamber (4) two sides；The supervisor of the inlet end gas-distributing pipe (6) is connected to gas production mouth (1), the outlet side gas-distributing pipe (7) Supervisor is connected to instrument air inlet (2)；The filter group (5) is provided with solenoid valve block (8), and the solenoid valve block (8) includes The solenoid valve (9) ventilated or died for each filter chamber of independent control (4)；The solenoid valve block (8) is connected with can be to each The controller (10) that solenoid valve (9) is controlled.

2. a kind of two-stage multichannel atmosphere collection tube road according to claim 1 filtration system, it is characterised in that: Mei Gesuo The air inlet or gas outlet for stating filter chamber (4) are provided with can be to the governor one (11) that gas flow rate is adjusted.

3. a kind of two-stage multichannel atmosphere collection tube road according to claim 1 or 2 filtration system, it is characterised in that: institute State be provided on inlet end gas-distributing pipe (6) or outlet side gas-distributing pipe (7) can to the governor two (12) that gas flow rate is adjusted, The governor two (12) is located on the supervisor of inlet end gas-distributing pipe (6) or the supervisor of outlet side gas-distributing pipe (7).

4. a kind of two-stage multichannel atmosphere collection tube road according to claim 1 filtration system, it is characterised in that: the mistake Filter group (5) includes bottom plate (13), and the filter chamber (4) includes the groove (14) being set on bottom plate (13), the groove (14) it is equipped with filter membrane (15) in, the top plate (16) that groove (14) can be sealed is provided on the bottom plate (13)；The bottom plate (13), be respectively arranged with the gas-guide tube (17) being connected to groove (14) on top plate (16), the gas-guide tube (17) respectively with it is corresponding Shunt pipe connection.

5. a kind of two-stage multichannel atmosphere collection tube road according to claim 4 filtration system, it is characterised in that: the bottom Groove (14) quantity on plate (13) is 3~15, is provided with multiple filter membranes (15), Mei Gesuo in each groove (14) The aperture for stating filter membrane (15) is sequentially reduced along airflow direction；The interior filter membrane of each groove (14) (15) and groove (14) bottom it Between be provided with porous support plate (18), be provided with lower sealing ring (19) between the support plate (18) and groove (14) bottom, Upper sealing ring (20) are provided between the filter membrane (15) and top plate (16).

6. a kind of two-stage multichannel atmosphere collection tube road according to claim 1 filtration system, it is characterised in that: described more It is provided with cyclonic filter unit (21) between the inlet end and gas production mouth (1) of Channel filtration unit (3), the cyclonic filter unit It (21) include cyclone filter (22), the cyclone filter (22) includes cylinder (23), and cylinder (23) top is equipped with top It covers, the air inlet pipe being connected to gas production mouth (1) is being installed along a tangential direction close to top cover position on cylinder (23) side wall (24)；Cylinder (23) bottom opening, opening are connected with the conically shaped (25) being connected to cylinder (23) inner cavity, the taper The heavy caliber edge of cylinder (25) is connect with cylinder (23) bottom opening edge seal, the small-bore one end connection of conically shaped (25) There is the collecting chamber (26) being connected to conically shaped (25) inner cavity；Exhaust tube (27), the exhaust are provided at the top of the cylinder (23) The bottom of cylinder (27) passes through the top cover of cylinder (23) and is located at cylinder (23) inner cavity；The exhaust tube (27) is located above top cover One end is connected to the supervisor of inlet end gas-distributing pipe (6).

7. a kind of two-stage multichannel atmosphere collection tube road according to claim 6 filtration system, it is characterised in that: the rotation It is connect respectively by triple valve one (28), triple valve two (29) between the air inlet pipe (24) of wind filter (22) and exhaust tube (27) There is pipeline one (30).

8. a kind of two-stage multichannel atmosphere collection tube road according to claim 7 filtration system, it is characterised in that: it is described into Pipeline two (32) is connected with by triple valve three (31) on the supervisor of gas end gas-distributing pipe (6), the pipeline two (32) is far from threeway One end of valve three (31) is connected to the supervisor of outlet side gas-distributing pipe (7), is provided with monomer strainer on the pipeline two (32) (33)。

9. a kind of two-stage multichannel atmosphere collection tube road according to claim 8 filtration system, it is characterised in that: the pipe Being provided on road two (32) can be to the governor one (11) that gas flow rate is adjusted.