CN109342161B - Two-stage multichannel atmospheric acquisition pipeline filtration system - Google Patents
Two-stage multichannel atmospheric acquisition pipeline filtration system Download PDFInfo
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- CN109342161B CN109342161B CN201811358769.5A CN201811358769A CN109342161B CN 109342161 B CN109342161 B CN 109342161B CN 201811358769 A CN201811358769 A CN 201811358769A CN 109342161 B CN109342161 B CN 109342161B
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- 238000001914 filtration Methods 0.000 title claims abstract description 45
- 239000012528 membrane Substances 0.000 claims description 28
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000000605 extraction Methods 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 10
- 238000009423 ventilation Methods 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000004458 analytical method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 5
- 238000011045 prefiltration Methods 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 53
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 25
- 239000007787 solid Substances 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000005374 membrane filtration Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000270730 Alligator mississippiensis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
Abstract
The invention relates to the technical field of pre-filtration of atmosphere online analysis, and discloses a two-stage multichannel atmospheric acquisition pipeline filtration system, which comprises a multichannel filtration unit, wherein the multichannel filtration unit comprises a filter group with a plurality of filter cavities, and each filter cavity is provided with an electromagnetic valve; each electromagnetic valve independently controls the opening and closing sequence and the switching time interval of the electromagnetic valve through the controller, so that when one electromagnetic valve is in an open state, the rest electromagnetic valves are in a closed state. The multichannel filter unit is provided with a cyclone filter device in front to remove large-particle pollutants and liquid water in the gas sample. The invention avoids the large attenuation effect strain of the high-frequency signal of the gas concentration, simultaneously increases the effective filtering time of the preposed filtering system of the gas analyzer in multiple, avoids the damage of the instrument caused by the liquid water in the gas sample entering the instrument, greatly prolongs the continuous operation time of the analyzing instrument and improves the field observation quality.
Description
Technical Field
The invention relates to the technical field of pre-filtration for on-line analysis of atmosphere, in particular to a two-stage multi-channel atmosphere acquisition pipeline filtration system.
Background
In scientific research or observation in the related fields of ecology, environmental science, geography and the like, a rapid response instrument is often required to continuously and online analyze and monitor trace and trace gas components (such as the concentration of CO 2、CH4、N2 O in the atmosphere, the related isotope ratio and the like) in the atmosphere. At present, a laser technology is mostly adopted by the instrument for measuring trace gas components in the atmosphere. To increase the sensitivity to trace gas assays, it is desirable to transport the gas sample through a conduit into a specific measurement chamber to increase the optical path and reduce interference. Such on-line analyzers based on laser measurement techniques are very sensitive to solid particulates and liquid water entering the chamber when performing trace gas component measurements, and the presence of liquid water can cause damage to some parts of the instrument.
Pre-filtration systems are currently commonly used to filter the gas before it enters the chamber to keep the chamber clean enough to achieve accuracy and precision of the measurement.
The existing pre-filtration system mainly adopts a cylindrical filter or a multi-stage plate type membrane-exchange filtration system. The cylindrical filter is characterized in that a cylindrical filter element is arranged in a filter cartridge, and 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 of the gas and the filter element, thereby prolonging the effective filtering time of solid particles. And a multistage plate type membrane exchange filter system is arranged in the pipeline, so that the efficiency of filtration can be improved to a certain extent by increasing the number of membrane filtration stages relative to single-stage filtration.
However, the increase of the membrane filtration stage number increases the air resistance of the pipeline, and the air resistance is larger and larger along with the increase of the running time, so that the air pressure in the cavity is difficult to keep in a stable state, and the cleaning and maintenance frequency is increased; the filter cavity of the cylindrical filter is often large in volume, and a mixing process of gas can be generated, so that the condition of high-frequency signal attenuation of the concentration of the collected gas can be caused.
Disclosure of Invention
Based on the problems, the invention provides a two-stage multichannel atmospheric acquisition pipeline filtering system, which avoids the problem that the high-frequency signal attenuation effect of the concentration of the acquired gas is large due to the fact that the volume of a filtering cavity is large and gas is easy to mix in the process of filtering particulate matters in the atmosphere; meanwhile, the effective filtering time of the multi-channel filtering unit is multiplied, the frequency of replacing the filter membrane is effectively reduced, and the continuous operation time of the analysis instrument is prolonged.
In order to solve the technical problems, the invention provides the following technical scheme:
The two-stage multichannel atmospheric air collection pipeline filtering system comprises a multichannel filtering unit arranged between a gas extraction port and an instrument gas inlet, wherein the multichannel filtering unit comprises a filter group consisting of a plurality of filter cavities which are separated from each other; the filter group is provided with an air inlet end air distribution pipe and an air outlet end air distribution pipe, each of the air inlet end air distribution pipe and the air outlet end air distribution pipe comprises a main pipe and a branch pipe corresponding to each filter cavity, and the air inlet end air distribution pipe and the air outlet end air distribution pipe are respectively communicated with two sides of each filter cavity of the filter group through the branch pipes; the main pipe of the gas-inlet end gas-distributing pipe is communicated with the gas-collecting port, and the main pipe of the gas-outlet end gas-distributing pipe is communicated with the instrument gas inlet; the filter group is provided with an electromagnetic valve group, and the electromagnetic valve group comprises electromagnetic valves for independently controlling ventilation or air interruption of each filter cavity; the electromagnetic valve group is connected with a controller capable of controlling each electromagnetic valve, and the controller is used for independently controlling each electromagnetic valve to be cyclically opened and closed, and in a control period, when one filter cavity is in a ventilation state, the other filter cavities are in an air-break state; the control parameters of the controller comprise the opening and closing sequence of the electromagnetic valves and the switching time interval of the electromagnetic valves.
Further, the air inlet or the air outlet of each filter cavity is provided with a first speed regulator capable of regulating the air flow rate.
Further, a second speed regulator capable of regulating the gas flow rate is arranged on the gas inlet end gas distribution pipe or the gas outlet end gas distribution pipe, and the second speed regulator is positioned on a main pipe of the gas inlet end gas distribution pipe or a main pipe of the gas outlet end gas distribution pipe.
Further, the filter group comprises a bottom plate, the filter cavity comprises a groove arranged on the bottom plate, a filter membrane is arranged in the groove, and a top plate capable of sealing the groove is arranged on the bottom plate; and the bottom plate and the top plate are respectively provided with an air duct communicated with the groove, and the air ducts are respectively communicated with the corresponding branch pipes.
Further, the number of grooves on the bottom plate is 3-15, a plurality of filter membranes are arranged in each groove, and the aperture of each filter membrane is sequentially reduced along the air flow direction; a porous supporting plate is arranged between the filter membrane and the bottom of each groove, a lower sealing ring is arranged between the supporting plate and the bottom of each groove, and an upper sealing ring is arranged between the filter membrane and the top plate.
Further, a cyclone filter unit is arranged between the air inlet end of the multi-channel filter unit and the air extraction port, the cyclone filter unit comprises a cyclone filter, the cyclone filter comprises a cylinder, a top cover is arranged on the upper part of the cylinder, and an air inlet pipe communicated with the air extraction port is arranged on the side wall of the cylinder at a position close to the top cover along the tangential direction; the bottom of the cylinder body is provided with an opening, a conical cylinder communicated with the inner cavity of the cylinder body is connected at the opening, the edge of the large caliber of the conical cylinder is connected with the edge of the opening at the bottom of the cylinder body in a sealing way, and a collecting chamber communicated with the inner cavity of the conical cylinder is connected at one small caliber end of the conical cylinder; the top of the cylinder body is provided with an exhaust tube, and the bottom of the exhaust tube penetrates through the top cover of the cylinder body and is positioned in the inner cavity of the cylinder body; one end of the exhaust funnel above the top cover is communicated with the main pipe of the air distribution pipe at the air inlet end.
Further, a pipeline I is connected between the air inlet pipe of the cyclone filter and the exhaust barrel through a three-way valve I and a three-way valve II respectively.
Further, a pipeline II is connected to the main pipe of the gas-inlet-end gas-distributing pipe through a three-way valve III, one end, far away from the three-way valve III, of the pipeline II is communicated with the main pipe of the gas-outlet-end gas-distributing pipe, and a monomer filter is arranged on the pipeline II.
Further, a first speed regulator capable of regulating the gas flow rate is arranged on the second pipeline.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the multi-channel filter unit consisting of a plurality of independent filter cavities to filter the particulate matters in the gas, and adopts the controller to sequentially switch the electromagnetic valves of the filter cavities to open and close so as to realize the sequential filtering of the single filter cavity, thereby avoiding the problem that the high-frequency signal attenuation effect strain of the collected gas concentration is large due to the fact that the volume of the filter cavity is relatively large and the gas is easy to mix, simultaneously enabling the filter cavities of the multi-channel filter unit to sequentially and independently filter, doubling the filtering time, effectively reducing the frequency of replacing the filter membrane, and prolonging the continuous running time of an analysis instrument. Meanwhile, the cyclone filter unit effectively avoids the problem that liquid water in air enters the instrument to cause instrument damage.
Drawings
FIG. 1 is a schematic diagram of the two-stage multi-channel atmospheric collection line filtration system of embodiments 1 and 2;
FIG. 2 is a schematic diagram showing the connection of the gas inlet end gas distribution pipe, the gas outlet end gas distribution pipe and the filter group in example 1;
FIG. 3 is a schematic view showing the structure of a filter unit of embodiment 1;
FIG. 4 is a schematic view showing the structure of a cyclone filter according to example 1;
FIG. 5 is a top view of a cyclone filter of example 1;
FIG. 6 is a graph of the detected methane concentration recorded over time for 30 days in the LGR rapid methane analyzer of example 2;
FIG. 7 is a graph of cavity ring-down time recorded over 30 days for the LGR flash methane analyzer of example 2;
FIG. 8 is a graph of the optical cavity pressure recorded over 30 days for the LGR flash methane analyzer of example 2 over time;
FIG. 9 is a graph of the temperature of the optical cavity recorded over 30 days for the LGR flash methane analyzer of example 2 over time;
Wherein: 1. a gas extraction port; 2. an instrument air inlet; 3. a multi-channel filtration unit; 4. a filter chamber; 5. a filter group; 6. an air inlet end air distribution pipe; 7. an air outlet end air distribution pipe; 8. an electromagnetic valve group; 9. an electromagnetic valve; 10. a controller; 11. a first speed regulator; 12. a second speed regulator; 13. a bottom plate; 14. a groove; 15. a filter membrane; 16. a top plate; 17. an air duct; 18. a support plate; 19. a lower seal ring; 20. an upper seal ring; 21. a cyclone filter unit; 22. a cyclone filter; 23. a cylinder; 24. an air inlet pipe; 25. a conical cylinder; 26. a collection chamber; 27. an exhaust pipe; 28. a first three-way valve; 29. a three-way valve II; 30. a first pipeline; 31. three-way valve III; 32. a second pipeline; 33. a monomer filter.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1:
Referring to fig. 1-3, a two-stage multi-channel atmospheric air collection line filtration system includes a multi-channel filtration unit 3 disposed between a gas extraction port 1 and an instrument gas inlet port 2, the multi-channel filtration unit 3 including a filter group 5 composed of 8 filter chambers 4 separated from each other; the filter group 5 is provided with an air inlet end air distribution pipe 6 and an air outlet end air distribution pipe 7, the air inlet end air distribution pipe 6 and the air outlet end air distribution pipe 7 respectively comprise a main pipe and a branch pipe corresponding to the filter cavities 4, and the air inlet end air distribution pipe 6 and the air outlet end air distribution pipe 7 are respectively communicated with two sides of each filter cavity 4 of the filter group 5 through the branch pipes; the main pipe of the gas inlet end gas distribution pipe 6 is communicated with the gas extraction port 1, and the main pipe of the gas outlet end gas distribution pipe 7 is communicated with the instrument gas inlet 2; the filter group 5 is provided with an electromagnetic valve group 8, and the electromagnetic valve group 8 comprises electromagnetic valves 9 for independently controlling ventilation or air interruption of each filter cavity 4; the electromagnetic valve group 8 is connected with a controller 10 capable of controlling each electromagnetic valve 9, the controller 10 is used for independently controlling each electromagnetic valve 9 to be opened and closed in a circulating way, and in a control period, when one filter cavity 4 is in a ventilation state, the rest filter cavities 4 are all in an air-break 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 air enters the filter chambers 4 through the air intake 1, the particulate matters therein are filtered, the filtered air enters the analyzer for analysis, and the controller 10 controls the opening and closing of the electromagnetic valves 9, including the opening and closing sequence of the electromagnetic valves 9, the switching time interval and the circulation times of the electromagnetic valves 9, so that when one filter chamber 4 is in a ventilation state, the rest filter chambers 4 are all in a gas-off state; when the collected atmosphere enters the multi-channel filtering unit 3, only one filtering cavity 4 is in a ventilation state at a time, the atmosphere is filtered, the volume of the filtering cavity 4 is effectively reduced, and the problem that the high-frequency signal attenuation effect strain of the concentration of the collected gas is large due to the fact that gas is easy to mix when the volume of the filtering cavity 4 is large is avoided; meanwhile, a plurality of independent filter cavities 4 are recycled, any one channel has a problem, other channels are not affected, and the data missing time is greatly reduced; the effective filtering time of the multi-channel filtering unit 3 is multiplied, the frequency of replacing the filter membrane 15 is effectively reduced, and the continuous running time of the analysis instrument is prolonged.
The air inlet or the air outlet of each filter cavity 4 is provided with a first speed regulator 11 capable of regulating the air flow rate, and the air pressure in the instrument can be changed when the pipelines are switched due to small differences of the pipeline lengths of different filter cavities 4, the air resistances of components and the like. By adding a speed regulator 11 to each filter cavity 4 for regulating the air flow speed of each filter cavity 4, the air resistance in each filter cavity 4 is consistent, so that the air resistance difference of each filter cavity 4 is eliminated. In the embodiment, a first speed regulator 11 is arranged on a branch pipe of the gas outlet end gas distribution pipe 7 to realize the adjustment of the gas flow speed of each filter cavity 4, so that the gas resistance in each filter cavity 4 is consistent, and the gas resistance difference of each filter cavity 4 is eliminated; on the basis of not deviating from the essence of the invention, the first speed regulator 11 is arranged on the branch pipe of the air inlet end air distribution pipe 6, so that the purpose of regulating the air flow speed and eliminating the air resistance difference of each filter cavity 4 can be realized.
The air inlet end air distribution pipe 6 or the air outlet end air distribution pipe 7 is provided with a second speed regulator 12 capable of regulating the air flow rate, and the second speed regulator 12 is positioned on a main pipe of the air inlet end air distribution pipe 6 or a main pipe of the air outlet end air distribution pipe 7 so as to control and regulate the air pressure entering the analyzer and meet the requirement of enabling the atmosphere entering the analyzer to meet the stable air flow rate required by detection. In the embodiment, the second governor 12 is arranged on the main pipe of the air inlet end air distribution pipe 6 or the main pipe of the air outlet end air distribution pipe 7, so as to realize the purpose of regulating the air pressure entering the analyzer to stabilize the air flow speed entering the analyzer, and on the basis of not deviating from the essential content of the invention, the second governor 12 can also be arranged at any position on the main pipe of the filtering system, so that the air flow entering the filtering system or the instrument is subjected to flow speed regulation through the second governor 12, and the purpose of regulating the air pressure entering the analyzer to stabilize the air flow speed entering the analyzer can also be realized.
Referring to fig. 1 and 3, the filter group 5 comprises a bottom plate 13, the filter cavity 4 comprises a groove 14 arranged on the bottom plate 13, a filter membrane 15 is arranged in the groove 14, and a top plate 16 capable of sealing the groove 14 is arranged on the bottom plate 13; the bottom plate 13 and the top plate 16 are respectively provided with an air duct 17 communicated with the groove 14, and the air ducts 17 are respectively communicated with the corresponding branch pipes. The number of the grooves 14 on the bottom plate 13 is 8, a plurality of filter membranes 15 are arranged in each groove 14, and the aperture of each filter membrane 15 is sequentially reduced along the air flow direction; a porous support plate 18 is arranged between the filter membrane 15 and the bottom of the groove 14 in each groove 14, a lower sealing ring 19 is arranged between the support plate 18 and the bottom of the groove 14, and an upper sealing ring 20 is arranged between the filter membrane 15 and the top plate 16. The filter membrane 15 with the aperture sequentially reduced along the air flow direction is adopted, so that the problem of blockage caused by filtering by adopting the single-aperture filter membrane 15 is avoided, and the filtering efficiency of tiny particles is improved; the arrangement of the supporting plate 18 can reduce the deformation of the filter membrane 15 when the gas flows at high speed, and prevent the filter membrane 15 from being broken, thereby further ensuring the filtering effect of the membrane filter.
It should be noted that the filtration principle is an operation in which a liquid (or gas) in a suspension (or a gas containing solid particles) is permeated through a filter medium having fine pore passages by an urging force or other external force, and the solid particles and other substances are trapped by the filter medium, thereby separating the solid and other substances from the liquid (or gas). Thus, other filter devices having a micro-porous filter medium, such as a plurality of plate membrane filters or a plurality of cylindrical filters, may be employed in the present invention as a filter device having a micro-porous filter medium without departing from the spirit of the present invention.
Referring to fig. 1, 4 and 5, a cyclone filter unit 21 is arranged between an air inlet end of the multi-channel filter unit 3 and the air extraction port 1, the cyclone filter unit 21 comprises a cyclone filter 22, the cyclone filter 22 comprises a cylinder 23, a top cover is arranged at the upper part of the cylinder 23, and an air inlet pipe 24 communicated with the air extraction port 1 is arranged on the side wall of the cylinder 23 at a position close to the top cover along the tangential direction; the bottom of the cylinder 23 is provided with an opening, a conical cylinder 25 communicated with the inner cavity of the cylinder 23 is connected at the opening, the large-caliber edge of the conical cylinder 25 is in sealing connection with the edge of the opening at the bottom of the cylinder 23, and one small-caliber end of the conical cylinder 25 is connected with a collecting chamber 26 communicated with the inner cavity of the conical cylinder 25; the top of the cylinder 23 is provided with an exhaust tube 27, and the bottom of the exhaust tube 27 passes through the top cover of the cylinder 23 and is positioned in the inner cavity of the cylinder 23; one end of the exhaust tube 27 above the top cover is communicated with the main pipe of the air inlet end air distribution pipe 6. The atmosphere carrying the particulate matters and the liquid water enters the cylinder 23 from the air inlet pipe 24 along the tangential direction of the inner wall of the cylinder 23 at a certain speed, and forms a rotational flow in the cylinder 23; the large granular substances and the liquid water gradually approach the inner wall of the cylinder 23 under the action of centrifugal force, and move spirally to the bottom of the cylinder 23 and the conical cylinder 25 under the action of gravity and downward thrust generated when external air flow gradually enters the cylinder 23, and finally the large granular substances and the liquid water enter the collecting chamber 26; the purified air flow is rebound upwards through the side wall of the conical cylinder 25 and is discharged by the exhaust cylinder 27, so that the separation of gas, liquid and solid is realized; the problem of the large granule material cause the air lock in the increase pipeline when blockking up membrane filtration system has been avoided to further prolonged the time of instrument effective operation, reduced the maintenance frequency, and effectively avoided liquid water to get into the problem that causes data interference, instrument damage in the follow-up analysis flow.
A first pipeline 30 is connected between the air inlet pipe 24 of the cyclone filter 22 and the exhaust barrel 27 through a first three-way valve 28 and a second three-way valve 29 respectively. The first pipeline 30 can be used for cleaning the cylinder 23, the conical cylinder 25 and the collecting chamber 26 of the air filter 22 by controlling the first three-way valve 28 and the second three-way valve 29 to enable the air inlet pipe 24 to be communicated with the exhaust cylinder 27 through the first pipeline 30 when the air filter 22 needs to be cleaned, and no air flow passes through the inner cavity of the cylinder 23.
The main pipe of the gas-inlet-end gas-distributing pipe 6 is connected with a pipeline II 32 through a three-way valve III 31, one end, far away from the three-way valve III 31, of the pipeline II 32 is communicated with the main pipe of the gas-outlet-end gas-distributing pipe 7, and a monomer filter is arranged on the pipeline II 32. 33, when the multichannel filtering unit 3 needs to be cleaned, the three-way valve III 31 is regulated to enable air flow to enter the monomer filter from the pipeline II 32, so that the continuous normal operation of the analysis instrument is ensured; at this time, the filter group 5 stops running, and personnel can conveniently change the membrane and overhaul.
The first speed regulator 11 capable of regulating the air flow rate is arranged on the second pipeline 32, so that the air flow rate in the single filter can be regulated, and the air resistances in the filter cavities 4 are consistent, so that the air resistance difference of the filter cavities 4 is eliminated, the consistency with the flow rate of the filtering channels of the filter group 5 is ensured, and the fact that the detection data of the analyzer cannot generate larger fluctuation when the single filter is switched to filter is ensured.
Example 2:
In the methane flux observation experiment of the Hunan Yuyang reed beach, an air extraction pump is an Edwards vacuum pump (XDS-35 i, edward, MA, USA), an analyzer and the vacuum pump are powered by 220V commercial power, and the system is installed at an air inlet of an LGR rapid methane analyzer (FMA DLT 100,Los Gator Research Ltd).
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 electromagnetic valve 9 to be opened independently for 1h, and then sequentially switches to the next electromagnetic valve 9, and performs cyclic opening and closing.
Through observing, in the original single-channel plate filter adopting the multi-stage filter membrane, the generated pipeline pollution and the serious pipeline pollution need to be replaced by a filter device around a week, the shutdown loss generated during the process and the optical cavity pollution problem caused in the pump opening process are serious, the pipeline cleaning and the mirror cleaning work inside the instrument are time-consuming and labor-consuming, and a large amount of data are lost.
The system is arranged in front of the air inlet of the LGR rapid methane analyzer for test operation, and the uninterrupted operation time of the instrument is greatly prolonged. As shown in FIG. 6, the system is operated continuously for 33 days (3 times of mains supply interruption occur during the period of 33 days in Hunan Yueyang beach, the power-off time is respectively 15:35 instant for 7 months 30 days, 4:30-15:37 for 7 months 31 days, 5:55-13:07 for 8 months 14 days, and the analyzer and the system are started automatically after the power-on), so that the operation states of the system and the LGR rapid methane analyzer are kept good. During flood period, methane concentration is kept at 2-8 ppm, daily change rule is obvious, the flooding regulation is obvious, and the optical cavity cleanliness of the LGR rapid methane analyzer is very stable. As shown in FIG. 7, the drop was very slow, except that the cavity ring-down time was reduced to 5.1. Mu.s during the first power-off restart (the small amount of contaminants stored in the instrument tubing was off the inner wall at the instant the pump was turned on and contaminated the high reflection mirror) and the instrument was kept at about 5.0. Mu.s for more than 30 days thereafter. As shown in FIGS. 8 and 9, the cavity pressure is substantially maintained between 130 and 135Torr under the influence of the cavity temperature. The system greatly prolongs the normal operation time of the instrument, greatly reduces the cost of manpower and material resources for maintaining the LGR rapid methane analyzer, and improves the observation efficiency of the atmosphere. The above is an embodiment of the present invention. The foregoing embodiments and the specific parameters of the embodiments are only for clarity of description of the invention and are not intended to limit the scope of the invention, which is defined by the appended claims, and all equivalent structural changes made in the description and drawings of the invention are intended to be included in the scope of the invention.
Claims (6)
1. A two-stage multichannel atmosphere acquisition pipeline filtration system is characterized in that: the multi-channel filter unit (3) is arranged between the gas extraction port (1) and the instrument gas inlet (2), and the multi-channel filter unit (3) comprises a filter group (5) consisting of a plurality of filter cavities (4) which are separated from each other; the filter group (5) is provided with an air inlet end air distribution pipe (6) and an air outlet end air distribution pipe (7), the air inlet end air distribution pipe (6) and the air outlet end air distribution pipe (7) both comprise a main pipe and branch pipes corresponding to the filter cavities (4), and the air inlet end air distribution pipe (6) and the air outlet end air distribution pipe (7) are respectively communicated with two sides of each filter cavity (4) of the filter group (5) through the branch pipes; the main pipe of the air inlet end air distribution pipe (6) is communicated with the air extraction port (1), and the main pipe of the air outlet end air distribution pipe (7) is communicated with the instrument air inlet (2); the filter group (5) is provided with an electromagnetic valve group (8), and the electromagnetic valve group (8) comprises electromagnetic valves (9) for independently controlling ventilation or air interruption of each filter cavity (4); the electromagnetic valve group (8) is connected with a controller (10) capable of controlling each electromagnetic valve (9), the controller (10) is used for independently controlling each electromagnetic valve (9) to be opened and closed circularly, and in a control period, when one filter cavity (4) is in a ventilation state, the rest filter cavities (4) are all in an air-break state; the control parameters of the controller (10) comprise the opening and closing sequence of the electromagnetic valve (9) and the switching time interval of the electromagnetic valve (9);
The filter group (5) comprises a bottom plate (13), the filter cavity (4) comprises a groove (14) arranged on the bottom plate (13), a filter membrane (15) is arranged in the groove (14), and a top plate (16) capable of sealing the groove (14) is arranged on the bottom plate (13); the bottom plate (13) and the top plate (16) are respectively provided with an air duct (17) communicated with the groove (14), and the air ducts (17) are respectively communicated with corresponding branch pipes;
The number of grooves (14) on the bottom plate (13) is 3-15, a plurality of filter membranes (15) are arranged in each groove (14), and the aperture of each filter membrane (15) is sequentially reduced along the airflow direction; a porous supporting plate (18) is arranged between the filter membrane (15) in each groove (14) and the bottom of each groove (14), a lower sealing ring (19) is arranged between the supporting plate (18) and the bottom of each groove (14), and an upper sealing ring (20) is arranged between the filter membrane (15) and the top plate (16);
A cyclone filter unit (21) is arranged between the air inlet end of the multi-channel filter unit (3) and the air extraction port (1), the cyclone filter unit (21) comprises a cyclone filter (22), the cyclone filter (22) comprises a cylinder body (23), a top cover is arranged on the upper part of the cylinder body (23), and an air inlet pipe (24) communicated with the air extraction port (1) is arranged on the side wall of the cylinder body (23) close to the top cover along the tangential direction; the device is characterized in that the bottom of the cylinder body (23) is provided with an opening, a conical cylinder (25) communicated with the inner cavity of the cylinder body (23) is connected at the opening, the large-caliber edge of the conical cylinder (25) is connected with the edge of the opening at the bottom of the cylinder body (23) in a sealing way, and a collecting chamber (26) communicated with the inner cavity of the conical cylinder (25) is connected at one small-caliber end of the conical cylinder (25); the top of the cylinder body (23) is provided with an exhaust funnel (27), and the bottom of the exhaust funnel (27) penetrates through the top cover of the cylinder body (23) and is positioned in the inner cavity of the cylinder body (23); one end of the exhaust funnel (27) above the top cover is communicated with a main pipe of the air inlet end air distribution pipe (6).
2. A two-stage multi-channel atmospheric air collection pipeline filter system according to claim 1, wherein the air inlet or the air outlet of each filter cavity (4) is provided with a speed regulator I (11) capable of regulating the air flow rate.
3. The two-stage multi-channel air collection pipeline filtering system according to claim 1 or 2, wherein a second speed regulator (12) capable of regulating the air flow rate is arranged on the air inlet end air distribution pipe (6) or the air outlet end air distribution pipe (7), and the second speed regulator (12) is positioned on a main pipe of the air inlet end air distribution pipe (6) or a main pipe of the air outlet end air distribution pipe (7).
4. The two-stage multi-channel atmospheric air collecting pipeline filtering system as set forth in claim 1, wherein a pipeline I (30) is connected between the air inlet pipe (24) of the cyclone filter (22) and the exhaust pipe (27) through a three-way valve I (28) and a three-way valve II (29) respectively.
5. The two-stage multi-channel atmospheric collection pipeline filter system according to claim 4, wherein a pipeline II (32) is connected to the main pipe of the air inlet end air distribution pipe (6) through a three-way valve III (31), one end, far away from the three-way valve III (31), of the pipeline II (32) is communicated with the main pipe of the air outlet end air distribution pipe (7), and a monomer filter (33) is arranged on the pipeline II (32).
6. A two-stage multi-channel atmospheric collection pipeline filtration system as claimed in claim 5 wherein said pipeline two (32) is provided with a first governor (11) for adjusting the flow rate of the gas.
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| CN201811358769.5A CN109342161B (en) | 2018-11-15 | 2018-11-15 | Two-stage multichannel atmospheric acquisition pipeline filtration system |
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| CN201811358769.5A CN109342161B (en) | 2018-11-15 | 2018-11-15 | Two-stage multichannel atmospheric acquisition pipeline filtration system |
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| CN109342161B true CN109342161B (en) | 2024-04-26 |
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| CN112138451B (en) * | 2020-09-28 | 2022-05-24 | 迈邦（北京）环保工程有限公司 | Filtering device capable of rapidly treating sewage blockage |
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