CN208786097U - A kind of organic exhaust gas adsorption treating column - Google Patents
A kind of organic exhaust gas adsorption treating column Download PDFInfo
- Publication number
- CN208786097U CN208786097U CN201820887741.XU CN201820887741U CN208786097U CN 208786097 U CN208786097 U CN 208786097U CN 201820887741 U CN201820887741 U CN 201820887741U CN 208786097 U CN208786097 U CN 208786097U
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- Prior art keywords
- absorbing cylinder
- tower body
- exhaust gas
- plate
- adsorption
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 68
- 239000007921 spray Substances 0.000 claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 94
- 229910052799 carbon Inorganic materials 0.000 claims description 68
- 239000003610 charcoal Substances 0.000 claims description 43
- 230000008859 change Effects 0.000 claims description 18
- 230000008676 import Effects 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 50
- 239000002912 waste gas Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 14
- 238000005406 washing Methods 0.000 description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 5
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 150000002576 ketones Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002156 adsorbate Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model discloses a kind of organic exhaust gas adsorption treating columns, including tower body, just adsorption plate, inlet plate, interior absorbing cylinder, outer absorbing cylinder, outlet plate are successively arranged by air inlet pipe to escape pipe direction inside tower body, first adsorption plate is Double-level Reticulated panel, fills acticarbon in Double-level Reticulated panel；Acticarbon is equipped between interior absorbing cylinder and outer absorbing cylinder；It is venthole on the barrel of interior absorbing cylinder and outer absorbing cylinder；Inlet plate is equipped with air inlet, and the barrel edge of interior absorbing cylinder and the edge of air inlet connect；Outlet plate be equipped with venthole, venthole is annulus hole, outer absorbing cylinder with barrel edge be fixedly connected with the inner annular edge of venthole；Spray equipment is equipped in tower body, the lower section of tower body is equipped with catch box, catch box connected drainage pipe.The utility model realizes the adsorption treatment to organic exhaust gas, removes organic gas, meets waste gas emission standard, and treated, and exhaust gas is discharged to outdoor through blower or carries out subsequent processing.
Description
Technical field
The present invention relates to waste gas purification apparatuses, and in particular to a kind of organic exhaust gas adsorption treating column.
Background technique
Organic exhaust gas mainly uses the modes such as activated carbon adsorption, photodegradation, chemical reagent processing to handle, and wherein active carbon is inhaled
Attached tower is suitble to the operating environment of low concentration Wind Volume or high concentration intermittent discharge exhaust gas, and main application fields include: electronic component
Production, battery (storage battery) production, pickling job shop, experimental laboratory air exhausting, metallurgy, chemical plant, medical factory, Painting Shop,
Food and brewing, Furniture manufacturing etc..Organic exhaust gas is in purification process, due to containing a large amount of volatile organic compounds, exhaust gas
It,, can be effective after activated carbon adsorption into adsorption treatment tower after exhaust gas washing tower removes small suspended particulate and pernicious gas
Removing toluene, dimethylbenzene, alcohol, the organic gas such as ketone, meet the purification gas of discharge standard, be discharged to outdoor through blower.
Activated carbon adsorber is by the surface reaction forces using high performance active carbon adsorbent solids itself, by organic exhaust gas
The adsorbate of molecule attracts attachment adsorbent surface again, effectively environment purification, elimination can pollute, improve labor operations condition,
Ensure worker's health, and organic solvent can be recycled, reduces production cost.
Existing organic exhaust gas adsorption treating column has the following problems: 1, activated carbon adsorption organic exhaust gas molecule after, activity
The adsorption capacity of charcoal is gradually reduced, and needs to activate active carbon, 2, existing activated carbon adsorber, built-in active carbon
After installation is close, exhaust gas by difficulty, it is long to handle the time, reduces working efficiency, built-in active carbon installation is loose, exhaust gas
Effective adsorption effect is poor, and adsorption effect is not achieved.
Summary of the invention
Goal of the invention: in view of the deficiencies of the prior art, the present invention provides a kind of organic exhaust gas adsorption treating column, realizes to having
The adsorption treatment of machine exhaust gas removes the organic gas such as toluene, dimethylbenzene, alcohol, ketone, meets waste gas emission standard, and it is useless that treated
Gas is discharged to outdoor or progress subsequent processing through blower.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of organic exhaust gas adsorption treating column, including tower body, the tower body side connect air inlet pipe, and the other side connects outlet
Pipe；Inside the tower body by air inlet pipe to escape pipe direction be successively arranged just adsorption plate, inlet plate, interior absorbing cylinder, outer absorbing cylinder,
Outlet plate, just adsorption plate, inlet plate, the outlet plate are fixedly connected with tower body inner wall；The just adsorption plate is Double-level Reticulated panel,
Acticarbon is filled in the Double-level Reticulated panel；Interior absorbing cylinder, outer absorbing cylinder are equipped between the inlet plate and outlet plate,
The excircle of the interior absorbing cylinder is equipped with outer absorbing cylinder；Acticarbon is equipped between the interior absorbing cylinder and outer absorbing cylinder；
It is venthole on the barrel of the interior absorbing cylinder and outer absorbing cylinder；The inlet plate is equipped with air inlet, the interior absorbing cylinder
Barrel edge and air inlet edge connect；The outlet plate is equipped with venthole, and the venthole is annulus hole, described outer
Absorbing cylinder with barrel edge be fixedly connected with the inner annular edge of venthole；Spray equipment, the spray are equipped in the tower body
Device is located at the top of outer absorbing cylinder, and the spray equipment includes spray tube, spray head, and the spray tube is equipped with spray head；
The lower section of the tower body is equipped with catch box, the catch box connected drainage pipe.
Further, the upper wall of the tower body between the Double-level Reticulated panel is equipped with active carbon import, the Double-level Reticulated panel
Between tower body lower wall equipped with active carbon export.The active carbon filled in first adsorption plate can pass through active carbon import, active carbon
Outlet carries out effective replacement active carbon, since first adsorption plate has certain adsorption effect to organic exhaust gas, due to exhaust gas just into
Entering adsorption tower, the content of the organic gas in exhaust gas is high, therefore just the content of the organic gas of activated carbon adsorption is high in adsorption plate,
Therefore, the replacement fast speed of active carbon is just able to satisfy adsorption entails, simultaneously because just adsorption plate active carbon setting up and down into
Mouth, active carbon export the replacement of very convenient active carbon, in replacement, first open active carbon outlet, old active carbon is poured out, then
Active carbon outlet is closed, active carbon import is opened, pours into new active carbon；The charcoal import of being then shut off property, realizes active carbon more
It changes.Replacement speed is fast, and the setting of first adsorption plate is realized effectively to the preliminary absorption of organic exhaust gas, this setting tentatively adsorbed
Have the utility model has the advantages that be introduced into the thin active carbon layer tentatively adsorbed, will not influence the velocity of liquid assets of organic exhaust gas, while right
Organic exhaust gas is effectively adsorbed；Due to activated carbon adsorption, need periodically replace to active carbon either activating, therefore
When exhaust gas has just enter into adsorption tower with regard to preliminary absorption, reduce the pressure of consequent activities charcoal absorption, the activity in first adsorption plate
Charcoal replacement is very convenient.
Further, the top of the tower body is equipped with and above changes charcoal mouth, and the lower part of the tower body, which is equipped with down, changes charcoal mouth, described outer
The barrel top of absorbing cylinder is equipped with upper opening；The barrel lower part of the outer absorbing cylinder is equipped under shed；The upper opening is located at upper
Change the lower section of charcoal mouth；The lower section that charcoal mouth is located under shed is changed under described；Changed on described charcoal mouth, under change charcoal mouth, upper opening, under shed
On be equipped with sealing cover.Although active carbon can realize spray washing by spray equipment, the activation to active carbon is realized, use
After time is longer, still need replacing active carbon, above change charcoal mouth, under change the setting of opening on the barrel of charcoal mouth, outer absorbing cylinder,
Realize effective replacement active carbon.Replacing options are as follows: change charcoal mouth, under shed under opening, old active carbon is poured out；Charcoal is changed in opening
Mouth, upper opening, change charcoal mouth, under shed, pour into new active carbon under closing.
Further, access panel there are two being set on the tower body, the setting height and upper opening of one of access panel
Height is consistent, and the setting height of another access panel is consistent with the height of under shed.The setting of two access panels is, it can be achieved that pass through
Access panel opens upper and lower opening, and replacement active carbon is convenient.
Further, the bottom of the tower body is equipped with pedestal, and the top of the tower body is equipped with inspection platform, and the maintenance is flat
Platform connects ladder.Pedestal can consolidate tower body, the convenient maintenance to adsorption tower of the setting of inspection platform and ladder.
Further, the spray equipment is arranged two groups.It above changes charcoal mouth since the top of tower body is equipped with and is convenient for changing activity
Charcoal, therefore, by spray equipment be arranged two groups, and be symmetrical arranged, be staggered on change charcoal mouth, avoid replacement when, active carbon drops into spray
In shower pipe, and two groups of spray equipments, more evenly, spraying effect is more preferable for spray.
Compared with prior art, the invention has the following advantages: 1, activated carbon adsorption is high-efficient, adsorption capacity is strong；
The a variety of mixed organic exhaust gas of processing of activated carbon adsorber economically and efficiently, exhaust-gas treatment speed are fast；Removal rate may be up to
85% or more；2, structure novel of the invention, occupation area of equipment is small, and occupied area is small, and replacement active carbon is convenient, operation letter
It is single, and maintain easily, operating cost is low；3, during active carbon washing, the processing of organic exhaust gas is not influenced, it is therefore not necessary to
Shutdown carries out replacement active carbon, is entirely arranged easy to operate, and processing speed is fast；4, organic gas can be real in the washing water after washing
Now recycle；5, whole device is full seal type, can be used for indoor or outdoors, and operation is simple, safe；It is suitble to promote the use of.
Detailed description of the invention
The schematic diagram of internal structure of the invention that Fig. 1 is；
Fig. 2 is external structure schematic diagram of the invention；
Fig. 3 is the Section A-A figure in Fig. 1；
Fig. 4 is inlet plate structural schematic diagram；
Fig. 5 is outlet plate structural schematic diagram.
Reference signs list: tower body 100, air inlet pipe 200, escape pipe 300, first adsorption plate 1, inlet plate 2, interior absorbing cylinder 3,
Outer absorbing cylinder 4, outlet plate 5, air inlet 6, venthole 7, spray equipment 8, spray tube 81, spray head 82, catch box 9, drain pipe
10, active carbon import 11, active carbon outlet 12, on change charcoal mouth 13, under change charcoal mouth 14, upper opening 15, under shed 16, access panel
17, pedestal 18, inspection platform 19, ladder 20.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing.
Embodiment 1:
A kind of organic exhaust gas adsorption treating column as shown in figure 1, figure 2, figure 3, figure 4 and figure 5, including tower body 100, tower body one
Side connects air inlet pipe 200, and the other side connects escape pipe 300；Exhaust gas enters from air inlet pipe, after tower body adsorption treatment, from outlet
Pipe discharge.
Just adsorption plate 1, inlet plate 2, interior absorbing cylinder 3, outer suction is successively arranged by air inlet pipe to escape pipe direction inside tower body
Attached cylinder 4, outlet plate 5, first adsorption plate, inlet plate, outlet plate are fixedly connected with tower body inner wall；The air current flow direction of exhaust gas and just
Adsorption plate, inlet plate, the setting direction of outlet plate are vertical；First adsorption plate is Double-level Reticulated panel, filling activity in Double-level Reticulated panel
Carbon adsorbent；Interior absorbing cylinder, outer absorbing cylinder are equipped between inlet plate and outlet plate, the excircle of interior absorbing cylinder is equipped with outer absorption
Cylinder；Acticarbon is equipped between interior absorbing cylinder and outer absorbing cylinder；It is ventilation on the barrel of interior absorbing cylinder and outer absorbing cylinder
Hole；Inlet plate is equipped with air inlet 6, and the barrel edge of interior absorbing cylinder and the edge of air inlet connect；Outlet plate is equipped with outlet
Hole 7, venthole are annulus hole, outer absorbing cylinder with barrel edge be fixedly connected with the inner annular edge of venthole.Exhaust gas enters tower
After body, first handles, then entered in interior absorbing cylinder from the air inlet on inlet plate, so through the activated carbon adsorption in first adsorption plate
After the activated carbon adsorption between interior absorbing cylinder and outer absorbing cylinder, flowed out from the venthole of outlet plate；It is then discharged out tower body.
Be equipped with spray equipment 8 in tower body, spray equipment is located at the top of outer absorbing cylinder, spray equipment include spray tube 81,
Spray head 82, spray tube are equipped with spray head；The lower section of tower body is equipped with catch box 9, catch box connected drainage pipe 10.It is filled by spray
Realization is set to active carbon spray washing, the washing water after washing is flowed into catch box, is discharged from drain pipe, is realized to active carbon
Washing activation.
In the present embodiment, the upper wall of the tower body between Double-level Reticulated panel be equipped with active carbon import 11, Double-level Reticulated panel it
Between tower body lower wall be equipped with active carbon outlet 12.The active carbon filled in first adsorption plate can pass through active carbon import, active carbon
Outlet carries out effective replacement active carbon, since first adsorption plate has certain adsorption effect to organic exhaust gas, due to exhaust gas just into
Entering adsorption tower, the content of the organic gas in exhaust gas is high, therefore just the content of the organic gas of activated carbon adsorption is high in adsorption plate,
Therefore, the replacement fast speed of active carbon is just able to satisfy adsorption entails, simultaneously because just adsorption plate active carbon setting up and down into
Mouth, active carbon export the replacement of very convenient active carbon, in replacement, first open active carbon outlet, old active carbon is poured out, then
Active carbon outlet is closed, active carbon import is opened, pours into new active carbon；The charcoal import of being then shut off property, realizes active carbon more
It changes.Replacement speed is fast, and the setting of first adsorption plate is realized effectively to the preliminary absorption of organic exhaust gas, this setting tentatively adsorbed
Have the utility model has the advantages that be introduced into the thin active carbon layer tentatively adsorbed, will not influence the velocity of liquid assets of organic exhaust gas, while right
Organic exhaust gas is effectively adsorbed；Due to activated carbon adsorption, need periodically replace to active carbon either activating, therefore
When exhaust gas has just enter into adsorption tower with regard to preliminary absorption, reduce the pressure of consequent activities charcoal absorption, the activity in first adsorption plate
Charcoal replacement is very convenient.
In the present embodiment, the top of tower body is equipped with and above changes charcoal mouth 13, and the lower part of tower body, which is equipped with down, changes charcoal mouth 14, outer absorption
The barrel top of cylinder is equipped with upper opening 15；The barrel lower part of outer absorbing cylinder is equipped under shed 16；Upper opening, which is located at, above changes charcoal mouth
Lower section；Under change the lower section that charcoal mouth is located under shed；On change charcoal mouth, under change charcoal mouth, upper opening, be equipped with sealing cover under shed.
Although active carbon can realize spray washing by spray equipment, the activation to active carbon is realized, after using the time longer, still
Need replacing active carbon, above change charcoal mouth, under change the setting of opening on the barrel of charcoal mouth, outer absorbing cylinder, realize effective replacement
Active carbon.Replacing options are as follows: change charcoal mouth, under shed under opening, old active carbon is poured out；Charcoal mouth, upper opening are changed in opening, are closed
Under change charcoal mouth, under shed, pour into new active carbon.The setting of sealing cover guarantees the overall tightness of tower body, while avoiding active carbon
Shed.
In the present embodiment, access panel 17 there are two being set on tower body, the setting height and upper opening of one of access panel
Height it is consistent, the setting of another access panel height is consistent with the height of under shed.The setting of two access panels is, it can be achieved that logical
It crosses access panel and opens upper and lower opening, replacement active carbon is convenient.
In the present embodiment, the bottom of tower body is equipped with pedestal 18, and the top of tower body is equipped with inspection platform 19, and inspection platform connects
Connect ladder 20.Pedestal can consolidate tower body, the convenient maintenance to adsorption tower of the setting of inspection platform and ladder.
In the present embodiment, spray equipment is arranged two groups.It above changes charcoal mouth since the top of tower body is equipped with and is convenient for changing activity
Charcoal, therefore, by spray equipment be arranged two groups, and be symmetrical arranged, be staggered on change charcoal mouth, avoid replacement when, active carbon drops into spray
In shower pipe, and two groups of spray equipments, more evenly, spraying effect is more preferable for spray.
Obviously, the attached drawing in the specific embodiment of the invention is not necessarily drawn to scale, show it is of the invention must
Technical characteristic is wanted to do simplification to a certain extent.
As above, it although the present invention has been indicated and described referring to specific preferred embodiment, shall not be construed as pair
The limitation of invention itself.Without prejudice to the spirit and scope of the invention as defined in the appended claims, can to its
It makes a variety of changes in form and in details.
Claims (6)
1. a kind of organic exhaust gas adsorption treating column, it is characterised in that: including tower body, the tower body side connects air inlet pipe, another
Side connects escape pipe；Just adsorption plate, inlet plate, interior absorption is successively arranged by air inlet pipe to escape pipe direction inside the tower body
Cylinder, outer absorbing cylinder, outlet plate, just adsorption plate, inlet plate, the outlet plate are fixedly connected with tower body inner wall；The just adsorption plate
For Double-level Reticulated panel, the Double-level Reticulated panel is interior to fill acticarbon；Interior suction is equipped between the inlet plate and outlet plate
The excircle of attached cylinder, outer absorbing cylinder, the interior absorbing cylinder is equipped with outer absorbing cylinder；It is equipped between the interior absorbing cylinder and outer absorbing cylinder
Acticarbon；It is venthole on the barrel of the interior absorbing cylinder and outer absorbing cylinder；The inlet plate is equipped with air inlet,
The barrel edge of the interior absorbing cylinder and the edge of air inlet connect；The outlet plate is equipped with venthole, and the venthole is
Annulus hole, the outer absorbing cylinder with barrel edge be fixedly connected with the inner annular edge of venthole；Spray is equipped in the tower body
Device, the spray equipment are located at the top of outer absorbing cylinder, and the spray equipment includes spray tube, spray head, the spray tube
It is equipped with spray head；The lower section of the tower body is equipped with catch box, the catch box connected drainage pipe.
2. organic exhaust gas adsorption treating column according to claim 1, it is characterised in that: the tower between the Double-level Reticulated panel
The upper wall of body is equipped with active carbon import, and the lower wall of the tower body between the Double-level Reticulated panel is exported equipped with active carbon.
3. organic exhaust gas adsorption treating column according to claim 2, it is characterised in that: the top of the tower body is equipped with and above changes
Charcoal mouth, the lower part of the tower body, which is equipped with down, changes charcoal mouth, and the barrel top of the outer absorbing cylinder is equipped with upper opening；The outer absorbing cylinder
Barrel lower part be equipped under shed；The upper opening is located at the lower section for above changing charcoal mouth；Charcoal mouth is changed under described to be located under under shed
Side；Changed on described charcoal mouth, under change charcoal mouth, upper opening, be equipped with sealing cover under shed.
4. organic exhaust gas adsorption treating column according to claim 3, it is characterised in that: maintenance there are two being set on the tower body
Window, setting height, the setting height and under shed of another access panel consistent with the height of upper opening of one of access panel
Height it is consistent.
5. organic exhaust gas adsorption treating column according to claim 1, it is characterised in that: the bottom of the tower body is equipped with bottom
Seat, the top of the tower body are equipped with inspection platform, and the inspection platform connects ladder.
6. organic exhaust gas adsorption treating column according to claim 1, it is characterised in that: the spray equipment is arranged two groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820887741.XU CN208786097U (en) | 2018-06-08 | 2018-06-08 | A kind of organic exhaust gas adsorption treating column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820887741.XU CN208786097U (en) | 2018-06-08 | 2018-06-08 | A kind of organic exhaust gas adsorption treating column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208786097U true CN208786097U (en) | 2019-04-26 |
Family
ID=66200919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820887741.XU Expired - Fee Related CN208786097U (en) | 2018-06-08 | 2018-06-08 | A kind of organic exhaust gas adsorption treating column |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208786097U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110917837A (en) * | 2019-12-23 | 2020-03-27 | 姚俊 | Anesthesia waste gas adsorption device |
-
2018
- 2018-06-08 CN CN201820887741.XU patent/CN208786097U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110917837A (en) * | 2019-12-23 | 2020-03-27 | 姚俊 | Anesthesia waste gas adsorption device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190426 |