CN219984271U - Tail gas treatment device of generator set - Google Patents
Tail gas treatment device of generator set Download PDFInfo
- Publication number
- CN219984271U CN219984271U CN202320988616.9U CN202320988616U CN219984271U CN 219984271 U CN219984271 U CN 219984271U CN 202320988616 U CN202320988616 U CN 202320988616U CN 219984271 U CN219984271 U CN 219984271U
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- Prior art keywords
- air inlet
- pipe
- water tank
- gas
- inlet pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 238000010521 absorption reaction Methods 0.000 claims abstract description 45
- 239000002250 absorbent Substances 0.000 claims abstract description 16
- 230000002745 absorbent Effects 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 20
- 238000005192 partition Methods 0.000 claims description 10
- 238000007790 scraping Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 61
- 230000000694 effects Effects 0.000 abstract description 13
- 238000001914 filtration Methods 0.000 abstract description 6
- 239000002912 waste gas Substances 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 20
- 238000007599 discharging Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model provides a tail gas treatment device of a generator set, which comprises a water tank for separating oil stains from gas and an absorption tank for absorbing the gas, wherein the water tank is used for separating oil stains from the gas; the water tank is provided with an air inlet pipe which is deep into the water body and an air outlet pipe which is positioned at the upper end of the water body; the absorption box is internally provided with a solid absorbent, and is provided with an air duct communicated with an air outlet pipe and an exhaust pipe communicated with the outside. According to the utility model, through the matched use of the water tank and the absorption tank, the greasy dirt in the tail gas can be separated first, the influence of the greasy dirt on the treatment of subsequent gas is avoided, the absorption tank can adsorb the waste gas, the gas reaching the standard is discharged, the tail gas treatment effect is ensured, and the problems that the filter screen is blocked or the filtering effect is poor due to the fact that the conventionally arranged filter screen filters air are easy to cause are avoided.
Description
Technical Field
The utility model relates to the technical field of tail gas treatment, in particular to a tail gas treatment device of a generator set.
Background
Most of the existing generator set fuel oil mainly uses diesel oil, and the fuel oil type generator set can generate a large amount of black smoke or harmful substances and gases which are not completely combusted in the operation process and are discharged in a tail gas mode. The discharged tail gas mainly comprises harmful substances such as sulfide, hydrocarbon, carbon monoxide and the like, so that the tail gas needs to be treated before being discharged so as to reach the discharge standard.
Most of the existing tail gas treatment equipment adopts a filter screen for filtering treatment, and as the tail gas contains a certain amount of greasy dirt, the equipment can accumulate a large amount of greasy dirt on the filter screen under long-term use, and the filter screen can be blocked if the equipment is not cleaned in time, so that the filtering effect of the filter screen is gradually reduced.
For this reason, in the prior art (for example, patent application number CN202023330470.4, a tail gas treatment device of a generator set of patent name), a movable cleaning brush is provided on one side of the filter screen, and the filter screen is cleaned by adhering oil stains to the filter screen, so as to avoid blocking the filter screen.
However, the filter screen is required to filter the gas, the filter screen must have smaller aperture, the greasy dirt is accumulated in the filter screen aperture and is not easy to brush directly, if the cleaning brush is required to brush the greasy dirt on the filter screen, the brush hair made of metal (steel wire brush) is required to be arranged, and the brush hair made of metal is easy to abrade the aperture, so that the filtering effect of the filter screen is affected; the common soft brush hair is not easy to brush and remove the greasy dirt on the filter screen, so that the existing tail gas treatment device is not suitable for long-time use and cannot ensure the tail gas treatment effect.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides the tail gas treatment device of the generator set, oil stains in gas are separated through the arranged water tank, and the separated gas is subjected to adsorption treatment, so that the treatment effect of the tail gas is ensured.
According to the embodiment of the utility model, the tail gas treatment device of the generator set comprises a water tank for separating oil stains from gas and an absorption tank for absorbing the gas;
the water tank is provided with an air inlet pipe which is deep into the water body and an air outlet pipe which is positioned at the upper end of the water body;
the absorption box is internally provided with a solid absorbent, and is provided with an air duct communicated with an air outlet pipe and an exhaust pipe communicated with the outside.
Further, the water tank is provided with a water inlet pipe, a water outlet pipe and a cleaning fluid inlet pipe,
the water tank is internally provided with a plurality of partition boards which are arranged in a staggered mode up and down in sequence and are vertically arranged, the partition board positioned at the first installation position and the inner wall of the water tank enclose an air inlet cavity, the partition board positioned at the last installation position and the inner wall of the water tank enclose an air outlet cavity, the air inlet pipe is vertically arranged in the air inlet cavity, and the air outlet pipe is communicated with the air outlet cavity.
Further, a stirring mechanism is arranged in the air outlet cavity and comprises a stirring shaft vertically penetrating through the upper end of the air outlet cavity and rotationally connected with the air outlet cavity, and a plurality of arc scraping plates arranged on the stirring shaft, and a rotating motor is arranged on the stirring shaft.
Further, the air inlet pipe is provided with an oil scraping mechanism which is matched with the air inlet pipe for use,
the oil scraping mechanism comprises a scraper attached to the inner wall of the air inlet pipe and a driving component for driving the scraper to move annularly along the inner wall of the air inlet pipe, the driving component comprises a rotating shaft connected with the scraper, a pinion coaxially arranged on the rotating shaft, a large gear meshed with the pinion and a connecting shaft coaxially arranged with the large gear,
wherein the rotating shaft is rotationally connected with a connecting seat in the air inlet cavity, the connecting shaft is vertically arranged and penetrates through the upper end of the air inlet cavity and is rotationally connected with the air inlet cavity,
the upper end of the connecting shaft is provided with a first belt pulley, and the first belt pulley is connected with a second belt pulley arranged on the stirring shaft through a driving belt.
Further, the absorption case upper end is equipped with the passage, the absorption case lower extreme is equipped with row material pipe, the passage with row material pipe all is equipped with the tube cap.
Further, from the top down is equipped with a plurality of stock guide in the absorption case in proper order, and a plurality of stock guides set up along the horizontal direction is crisscross, and every stock guide slope sets up, the upper end of stock guide is all fixed with the absorption incasement wall, the lower extreme and the absorption incasement wall interval setting of stock guide.
The technical principle of the utility model is as follows: the blast pipe of engine unit meets with the intake pipe of water tank, and waste gas gets into the water tank from the intake pipe and gets into in, and the gas-liquid incompatibility, gaseous can be like the water surface spill over, and the dirty water that has in the gas is difficult for struggling the water that breaks loose along with the air, and the water that sets up in this water tank and the water tank can reach the purpose that separates the dirty oil in the gas, and the gas of separation greasy dirt gets into the absorption case, carries out the absorption treatment through the solid absorbent (active carbon, titanium dioxide catalyst etc.) in the absorption case, and the qualified gas of completion processing gets into the atmosphere from the blast pipe, accomplishes the processing to engine unit tail gas.
Compared with the prior art, the utility model has the following beneficial effects: according to the utility model, through the matched use of the water tank and the absorption tank, the greasy dirt in the tail gas can be separated first, the influence of the greasy dirt on the treatment of subsequent gas is avoided, the absorption tank can adsorb the waste gas, the gas reaching the standard is discharged, the tail gas treatment effect is ensured, and the problems that the filter screen is blocked or the filtering effect is poor due to the fact that the conventionally arranged filter screen filters air are easy to cause are avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a top view of the stirring shaft of the present utility model in combination with a plurality of arcuate blades.
In the above figures: 1. an air inlet pipe; 2. a water inlet pipe; 3. a scraper; 4. a rotating shaft; 5. a connecting seat; 6. a pinion gear; 7. a large gear; 8. a body of water; 9. a water tank; 10. a partition plate; 11. a drain pipe; 12. a tube cover; 13. a discharge pipe; 14. an interception net; 15. an exhaust pipe; 16. a solid absorbent; 17. an absorption box; 18. a material guide plate; 19. a material guiding pipe; 20. an air duct; 21. an arc-shaped scraping plate; 22. a stirring shaft; 23. a rotating motor; 24. a second pulley; 25. a drive belt; 26. a connecting shaft; 27. a first pulley; 28. and an air outlet pipe.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, an embodiment of the present utility model provides an exhaust gas treatment device of a generator set, which includes a water tank 9 for separating oil stains from gas and an absorption tank 17 for absorbing gas.
As shown in fig. 1, specifically, a water body 8 is disposed at the middle upper part in the water tank 9, and the water tank 9 is provided with an air inlet pipe 1 penetrating into the water body 8 and an air outlet pipe 28 located at the upper end of the water body 8. For facilitating the replacement of the water body 8 in the water tank 9, the water tank 9 is provided with a water inlet pipe 2 and a water outlet pipe 11, the water inlet pipe 2 can be provided with a valve for leading in tap water, the water outlet pipe 11 can also be provided with a valve for being communicated with a sewage pipe of a factory, and the waste water generated by the replacement can be conveniently and directly treated. In order to realize the cleaning in the water tank 9, the water tank 9 is also provided with a cleaning liquid feeding pipe (the cleaning liquid can be acidic, alkaline and neutral reagents) so that the cleaning agent capable of dissolving greasy dirt can be added into the water tank 9, and the greasy dirt generated by long-time use in the water tank 9 is removed by soaking.
As shown in fig. 1, since the tail gas of the engine unit is carried out in the water body 8 from the air inlet pipe 1, in order to prolong the residence time of the water body 8 in the water tank 9, a plurality of baffle plates 10 which are staggered up and down in sequence and are vertically arranged are further arranged in the water tank 9, the baffle plates 10 positioned at the first installation position and the inner wall of the water tank 9 enclose an air inlet cavity, the baffle plates 10 positioned at the last installation position and the inner wall of the water tank 9 enclose an air outlet cavity, the air inlet pipe 1 is vertically arranged in the air inlet cavity, and the air outlet pipe 28 is communicated with the air outlet cavity. The air inlet pipe 1 and the air outlet pipe 28 are respectively arranged at two ends of the arrangement direction of the plurality of partition boards 10, and the arrangement of the plurality of partition boards 10 increases the flow path of the air in the water tank 9, so that the oil dirt in the air can be more effectively separated from the air and collected on the surface of the water body 8.
As shown in fig. 1 and 2, after a water body 8 in a water tank 9 is used for a period of time, oil stains can be collected on the surface of the water body 8, and in order to reduce the influence of the oil stains collected on the surface of the water body 8 on the flow of gas, a stirring mechanism is arranged in the air outlet cavity, the stirring mechanism comprises a stirring shaft 22 vertically penetrating through the upper end of the air outlet cavity and rotationally connected with the top of the air outlet cavity through a sealing bearing, and a plurality of arc scraping plates 21 arranged on the stirring shaft 22, and a rotating motor 23 is arranged on the stirring shaft 22. The upper end height of arc scraper blade 21 is higher than water 8 surface, and arc scraper blade 21 lower extreme height is located water 8, and rotating motor 23 can be servo motor, then rotating motor 23 can control the rotational speed, drives (mixing) shaft 22 and slowly rotates, and then drives a plurality of arc scraper blades 21 and slowly rotates and dial out the greasy dirt of piling up on water 8 surface, and the gas flow of being convenient for is derived from outlet duct 28, gets into smoothly in the absorption case 17 and handles.
As shown in fig. 1, the air outlet end of the air inlet pipe 1 is in a water body 8, oil stains are relatively easy to accumulate, the aperture of the air inlet pipe 1 is easy to reduce, and the tail gas introducing efficiency is affected, therefore, in order to reduce the influence of the oil stains on the water inlet pipe 2, the air inlet pipe 1 is provided with a matched oil scraping mechanism, the oil scraping mechanism comprises a scraper 3 attached to the inner wall of the air inlet pipe 1 and a driving assembly driving the scraper 3 to circularly move along the inner wall of the air inlet pipe 1, the driving assembly comprises a rotating shaft 4 connected with the scraper 3, a pinion 6 coaxially arranged on the rotating shaft 4, a large gear 7 meshed with the pinion 6 and a connecting shaft 26 coaxially arranged with the large gear 7, wherein the rotating shaft 4 is in rotary connection with a connecting seat 5 in the air inlet cavity, and the connecting shaft 26 is vertically arranged and penetrates through the upper end of the air inlet cavity and is in rotary connection with the top of the air inlet cavity through a sealing bearing. In order to realize that the rotation energy of the stirring shaft 22 drives the connecting shaft 26 to rotate, more energy is saved, a first belt pulley 27 is arranged at the upper end of the connecting shaft 26, and the first belt pulley 27 is connected with a second belt pulley 24 arranged on the stirring shaft 22 through a transmission belt 25. When the device is used, the rotating motor 23 rotates to drive the stirring shaft 22 and the connecting shaft 26 to rotate simultaneously, the connecting shaft 26 rotates to drive the large gear 7 to rotate, the rotating shaft 4 is further driven to rotate, the rotating shaft 4 rotates to drive the scraper 3 to scrape out oil stains adhered to the inside of the air inlet pipe 1, the oil stains and the air inlet pipe 1 are separated into the water body 8 under the action of air flow, or are collected in the water body 8 or float to the surface of the water body 8, and are replaced along with the water body 8 to be led out of the water tank 9, so that the smooth feeding of the air inlet pipe 1 is ensured, and the oil stains on the inner wall of the air inlet pipe 1 are also convenient to process.
As shown in fig. 1, the gas after oil stain treatment from the water tank 9 enters the absorption tank 17 through the gas outlet pipe 28, in order to ensure the treatment effect of the absorption tank 17 on the gas, the upper end of the absorption tank 17 is provided with a gas guide pipe 20 communicated with the gas outlet pipe 28, the lower end of the absorption tank 17 is provided with a gas outlet pipe 15 communicated with the outside, and the inside of the absorption tank 17 is provided with a solid absorbent 16. The solid absorbent 16 may be a photocatalyst, activated carbon, or the like, and the solid absorbent 16 may absorb the composition of the exhaust gas. The gas led out from the gas outlet pipe 28 enters the absorption tank 17, is absorbed by the solid absorbent 16, and the treated exhaust gas is led out from the gas outlet pipe 15. In order to prevent the solid absorbent 16 from entering the air duct 20 and the exhaust pipe 15, the air outlet end of the air duct 20 and the air inlet end of the exhaust pipe 15 are both provided with an interception net 14, and the mesh of the interception net 14 is smaller than the volume of the solid absorbent 16.
As shown in fig. 1, in order to facilitate replacement of the solid absorbent 16 in the absorption tank 17, a material guiding pipe 19 is disposed at the upper end of the absorption tank 17, a material discharging pipe 13 is disposed at the lower end of the absorption tank 17, and pipe covers 12 are disposed on the material guiding pipe 19 and the material discharging pipe 13. The connection of the pipe cover 12 and the material guiding pipe 19 or the material discharging pipe 13 can be realized by a screwing mode (a connection mode of the bottle cover and the bottle mouth), so that the material guiding pipe 19 and the material discharging pipe 13 can be conveniently opened and closed. The solid absorbent 16 in the absorption tank 17 can be replaced after being saturated in use by the cooperation of the material guiding pipe 19 and the material discharging pipe 13.
As shown in fig. 1, in order to increase the absorption effect in the gas re-absorption tank 17 and facilitate the filling of the solid absorbent 16, a plurality of material guiding plates 18 are sequentially arranged in the absorption tank 17 from top to bottom, the material guiding plates 18 are staggered along the horizontal direction, each material guiding plate 18 is obliquely arranged, the upper ends of the material guiding plates 18 are fixed with the inner wall of the absorption tank 17, and the lower ends of the material guiding plates 18 are arranged at intervals with the inner wall of the absorption tank 17. The plurality of guide plates 18 function similarly to the plurality of partition plates 10 to ensure the gas absorption effect of the solid absorbent 16 in order to increase the flow path in the absorption tank 17, and the inclined arrangement of the guide plates 18 is convenient for filling the solid absorbent 16.
According to the utility model, through the matched use of the water tank 9 and the absorption tank 17, oil stains in tail gas can be separated first, the influence of the oil stains on the treatment of subsequent gas is avoided, the absorption tank 17 can adsorb the waste gas, the gas reaching standards is discharged, the tail gas treatment effect is ensured, and the problems that the filter screen is blocked or the filtering effect is poor due to the fact that the conventionally arranged filter screen filters air are easy to cause are avoided.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (6)
1. The utility model provides a generating set's tail gas processing apparatus which characterized in that: comprises a water tank for separating oil stains from gas and an absorption tank for absorbing the gas;
the water tank is provided with an air inlet pipe which is deep into the water body and an air outlet pipe which is positioned at the upper end of the water body;
the absorption box is internally provided with a solid absorbent, and is provided with an air duct communicated with an air outlet pipe and an exhaust pipe communicated with the outside.
2. The exhaust gas treatment device of a generator set according to claim 1, wherein: the water tank is provided with a water inlet pipe, a water outlet pipe and a cleaning fluid inlet pipe,
the water tank is internally provided with a plurality of partition boards which are arranged in a staggered mode up and down in sequence and are vertically arranged, the partition board positioned at the first installation position and the inner wall of the water tank enclose an air inlet cavity, the partition board positioned at the last installation position and the inner wall of the water tank enclose an air outlet cavity, the air inlet pipe is vertically arranged in the air inlet cavity, and the air outlet pipe is communicated with the air outlet cavity.
3. An exhaust gas treatment device for a generator set as claimed in claim 2, wherein: the stirring mechanism comprises a stirring shaft vertically penetrating through the upper end of the air outlet cavity and rotationally connected with the air outlet cavity, and a plurality of arc scraping plates arranged on the stirring shaft, and a rotating motor is arranged on the stirring shaft.
4. A generator set exhaust gas treatment device as claimed in claim 3, wherein: the air inlet pipe is provided with an oil scraping mechanism which is matched with the air inlet pipe,
the oil scraping mechanism comprises a scraper attached to the inner wall of the air inlet pipe and a driving component for driving the scraper to move annularly along the inner wall of the air inlet pipe, the driving component comprises a rotating shaft connected with the scraper, a pinion coaxially arranged on the rotating shaft, a large gear meshed with the pinion and a connecting shaft coaxially arranged with the large gear,
wherein the rotating shaft is rotationally connected with a connecting seat in the air inlet cavity, the connecting shaft is vertically arranged and penetrates through the upper end of the air inlet cavity and is rotationally connected with the air inlet cavity,
the upper end of the connecting shaft is provided with a first belt pulley, and the first belt pulley is connected with a second belt pulley arranged on the stirring shaft through a driving belt.
5. An exhaust gas treatment device of a generator set according to any one of claims 1 to 4, wherein: the absorption box upper end is equipped with the passage, the absorption box lower extreme is equipped with row material pipe, the passage with row material pipe all is equipped with the tube cap.
6. The exhaust gas treatment device of a generator set according to claim 5, wherein: the absorption box is internally provided with a plurality of guide plates from top to bottom in sequence, the guide plates are arranged in a staggered mode along the horizontal direction, each guide plate is obliquely arranged, the upper ends of the guide plates are fixed with the inner wall of the absorption box, and the lower ends of the guide plates are arranged at intervals with the inner wall of the absorption box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320988616.9U CN219984271U (en) | 2023-04-27 | 2023-04-27 | Tail gas treatment device of generator set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320988616.9U CN219984271U (en) | 2023-04-27 | 2023-04-27 | Tail gas treatment device of generator set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219984271U true CN219984271U (en) | 2023-11-10 |
Family
ID=88608795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320988616.9U Active CN219984271U (en) | 2023-04-27 | 2023-04-27 | Tail gas treatment device of generator set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219984271U (en) |
-
2023
- 2023-04-27 CN CN202320988616.9U patent/CN219984271U/en active Active
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