CN219797221U - Waste gas treatment incineration device - Google Patents
Waste gas treatment incineration device Download PDFInfo
- Publication number
- CN219797221U CN219797221U CN202320493728.7U CN202320493728U CN219797221U CN 219797221 U CN219797221 U CN 219797221U CN 202320493728 U CN202320493728 U CN 202320493728U CN 219797221 U CN219797221 U CN 219797221U
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- Prior art keywords
- incineration
- heat exchange
- gas
- waste gas
- exhaust
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- 239000002912 waste gas Substances 0.000 title claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 68
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003546 flue gas Substances 0.000 claims abstract description 30
- 239000002918 waste heat Substances 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims abstract description 6
- 239000000779 smoke Substances 0.000 claims description 13
- 239000012774 insulation material Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 1
- 239000012188 paraffin wax Substances 0.000 abstract description 19
- 238000012546 transfer Methods 0.000 abstract description 8
- 238000003466 welding Methods 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 239000004744 fabric Substances 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000001993 wax Substances 0.000 description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model relates to the technical field of waste gas treatment, and particularly discloses a waste gas treatment incineration device which comprises a waste gas incineration mechanism, a waste heat utilization mechanism and a gas conveying mechanism, wherein the waste gas incineration mechanism comprises an incineration hearth, an air inlet and an air outlet are formed in the incineration hearth, the air inlet is connected with a waste gas pipeline, the air outlet is connected with a flue gas pipeline, and a fire blocking wall and a waste gas distributor are arranged in the incineration hearth. This exhaust-gas treatment burns device, through adopting welding and tertiary heat transfer module between burning furnace and heat transfer unit, alternate gas conveying equipment and arrange between being close to burning furnace's one-level heat transfer module and second grade heat transfer module, reduced the service temperature requirement of burning device to gas conveying equipment to paraffin in the waste gas is difficult for condensing and is blockked up heat transfer module and gas conveying equipment, has solved paraffin exhaust-gas treatment device removal rate low, the heat loss is big, take up an area of big, takes place the problem of jam easily among the prior art.
Description
Technical Field
The utility model relates to the technical field of waste gas treatment, in particular to a waste gas treatment incineration device.
Background
At present, in industries such as copper-clad plate glass fiber, the demand of glass fiber cloth is huge, a layer of paraffin emulsifier is adhered to the surface of glass fiber cloth purchased in the market, and the glass fiber cloth is required to be subjected to dewaxing, acid washing, water washing, drying and other steps, so that alkali-free glass fiber cloth is manufactured, waste gas generated in the dewaxing process inevitably contains paraffin, and if the waste gas is not completely removed, the waste gas is circularly dried, so that organic matter of the glass fiber cloth is remained, white spots are easily generated on the glass fiber cloth after subsequent acid washing and water washing, and the product quality is greatly influenced. Because of the unique physical and chemical properties of paraffin, the paraffin has high viscosity in a high temperature state due to cooling solidification at a low temperature, so the treatment of paraffin waste gas is very difficult.
Common paraffin waste gas treatment modes, such as activated carbon adsorption, water washing, catalytic incineration, thermal storage type incineration and the like, wherein spray water washing or condensation recovery can not completely convert paraffin into liquid phase or solid phase, gaseous wax still remains in waste gas, white smoke is generated and peculiar smell exists during discharge, heat energy loss is huge by adopting the condensation mode aiming at high-temperature waste gas of a dewaxing furnace, and hot air is required to be continuously supplemented into the furnace, so that energy consumption is increased, and economy is poor. In addition, the liquid phase waste paraffin is regularly entrusted with qualification unit disposal after being collected, and the cost is greatly increased; activated carbon adsorption is only required to eliminate peculiar smell, and is difficult to meet the strict emission standard. The special structures of the catalytic incineration and the thermal storage type incineration require filling of the catalyst and the thermal storage body, and the high-temperature paraffin from the dewaxing furnace has viscosity and adheres to the pores of the catalyst and the thermal storage body to cause blockage.
The existing direct-fired waste gas incineration system has the problems that although the incinerator is not blocked, the incinerator is connected with a heat exchange unit by adopting a joint, the tightness is low, the heat loss is high, the mechanical sealing part is reduced integrally, the gas conveying equipment is generally arranged at the inlet and the outlet of the heat exchanger in a split type, the blockage is easy at low temperature, and the cost of a fan is increased when the temperature is too high. The device has high removal rate, small heat loss, modular integration, simple arrangement and difficult blockage.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, provides an exhaust gas treatment incineration device, and solves the problems of low removal rate, high heat loss and easy blockage of a paraffin exhaust gas treatment device in the prior art.
In order to achieve the above purpose, the utility model provides an exhaust gas treatment incineration device, which comprises an exhaust gas incineration mechanism, a waste heat utilization mechanism and a gas conveying mechanism, wherein the exhaust gas incineration mechanism comprises an incineration hearth, an air inlet and an air outlet are formed in the incineration hearth, the air inlet is connected with an exhaust gas pipeline, the air outlet is connected with a flue gas pipeline, a fire blocking wall and an exhaust gas distributor are arranged in the incineration hearth, and an ignition structure is also arranged on the incineration hearth; waste heat utilization mechanism: the flue gas pipeline is sequentially communicated with heat exchange channels of the primary heat exchange assembly, the secondary heat exchange assembly and the tertiary heat exchange assembly along an air outlet direction, and the waste gas pipeline is sequentially communicated with heating channels of the tertiary heat exchange assembly, the secondary heat exchange assembly and the primary heat exchange assembly along an air inlet direction; gas delivery mechanism: including setting up the exhaust fan on exhaust duct, exhaust fan is located between first grade heat exchange assembly and the second grade heat exchange assembly, the gas outlet of flue gas duct is provided with exhaust fan.
The beneficial effects are that: the waste gas treatment incinerator is used for thoroughly burning the paraffin in the waste gas containing the paraffin by adopting an incineration hearth incineration mode, the temperature in the incineration hearth is stabilized above 750 ℃, the paraffin in the waste gas is fully burnt and decomposed, and the final product is only carbon dioxide and water; the gas transmission mechanism is matched with the multi-stage heat exchange structure to perform waste heat utilization, and the gas transmission mechanism is arranged in the middle section of the two-stage heat exchange assembly close to the incineration hearth in a penetrating way, so that compared with the common gas transmission mechanism arranged at the front end or the rear end of an independent heat exchange device, the operation temperature of the gas transmission mechanism of the waste gas treatment incineration device is moderate, on one hand, the temperature requirement on the gas transmission mechanism is reduced, the cost is saved, and the equipment is prevented from operating at high temperature for a long time; on the other hand, paraffin is not easy to condense, blocks up heat exchange assembly and gas conveying equipment, prolongs the life of gas conveying mechanism, has avoided paraffin to block up the problem of catalyst, heat accumulation formula pottery to heat exchange mechanism makes the waste gas that takes heat that produces after the waste gas burning can obtain recycling, energy-concerving and environment-protective.
Drawings
Fig. 1 is a schematic view of an apparatus according to an embodiment of the present utility model.
In the figure: 1. a dewaxing furnace body; 2. an auxiliary combustion structure; 3. a smoke exhaust fan; 4. an exhaust gas distributor; 5. burning the hearth; 6. a three-stage heat exchange assembly; 7. a fire-blocking wall; 8. a secondary heat exchange assembly; 9. an exhaust gas fan; 10. a primary heat exchange assembly; 11. an access door; 12. an air blower; 13. a first exhaust pipe; 14. a second exhaust pipe; 15. a third exhaust pipe; 16. a first flue gas pipe; 17. a second flue pipe; 18. and a third flue pipe.
Detailed Description
The utility model will be further illustrated by the following drawings and specific examples, which are carried out on the basis of the technical solutions of the utility model, it being understood that these examples are only intended to illustrate the utility model and are not intended to limit the scope of the utility model.
As shown in fig. 1, the embodiment of the utility model provides an exhaust gas treatment incineration device, which comprises an exhaust gas incineration mechanism, a waste heat utilization mechanism and a gas conveying mechanism, wherein the exhaust gas incineration mechanism comprises an incineration hearth 5, an air inlet and an air outlet are formed in the incineration hearth 5, the air inlet of the incineration hearth 5 is connected with an exhaust gas pipeline, the air inlet of the exhaust gas pipeline is communicated with the air outlet of a dewaxing furnace body 1, and the air outlet of the incineration hearth 5 is connected with a flue gas pipeline. The gas inlet exhaust pipeline of the incineration furnace 5, the gas outlet flue pipeline of the incineration furnace 5 and the incineration furnace 5 are communicated in a welding mode, mechanical sealing is reduced, heat loss on a connecting pipeline between the prior incineration furnace and a heat exchanger is avoided, and energy consumption is effectively reduced.
And a fire blocking wall 7 and an exhaust gas distributor 4 are arranged in the incineration hearth 5. Specifically, the fire blocking wall 7 and the exhaust gas distributor 4 are positioned between the air inlet and the air outlet of the incineration hearth 5, the exhaust gas distributor 4 is positioned at the end part and the rear end of the incineration hearth 5 and is positioned at a position about 200 mm away from the side wall of the air inlet, so that the air flow entering the incineration hearth 5 is uniformly dispersed, and the combustion is more sufficient; the outer edge of the waste gas distributor 4 is matched with the inner wall of the incineration hearth 5, and the waste gas distributor 4 consists of blades and is distributed in a fan shape. The fire-blocking wall 7 is used for blocking flames and preventing the flames from burning through the wall surface of the incineration hearth 5.
The end part of the incineration furnace 5 is further provided with an auxiliary combustion structure 2, the auxiliary combustion structure 2 is generally an integrated burner or burner, the integrated burner is selected in the embodiment, the integrated burner comprises a combustion-supporting fan, a fuel pressurizing and conveying pipe fitting and an ignition monitoring controller, natural gas is selected as fuel, the natural gas energy combustion furnace belongs to clean energy sources, compared with other fossil fuels, the amount of carbon dioxide generated during combustion is relatively small, and the double-carbon target proposed by the nation is responded. When the concentration of the wax-containing waste gas is higher, the self-sustaining incineration can be realized through the auxiliary combustion structure 2, and when the concentration of the wax-containing waste gas is lower, the fuel can be immediately supplied to the incineration hearth 5 through the fuel conveying pipeline in the auxiliary combustion structure 2, so that the temperature of the incineration hearth 5 is stabilized to be higher than 750 ℃, the equipment can stably operate, and the service life of the equipment is ensured. The outside of the incineration furnace 5, the waste gas pipeline and the flue gas pipeline are all covered with heat insulation materials, generally rock wool or aluminum silicate fibers, the thickness of the heat insulation materials is more than 200 millimeters, the temperature of the outer wall surface of the device can be lower than 50 ℃, personnel scalding is avoided, and rock wool is selected in the embodiment. The incineration furnace 5 is provided with an access door 11, so that maintenance personnel can clean and overhaul regularly. The inner side wall of the incineration hearth 5 is covered with a heat insulation material, and the heat insulation material is an aluminum silicate module and a heavy refractory castable.
Waste heat utilization mechanism: including one-level heat exchange assembly 10, second grade heat exchange assembly 8 and tertiary heat exchange assembly 6, flue gas pipeline along the direction of giving vent to anger with the heat transfer passageway intercommunication of one-level heat exchange assembly 10, second grade heat exchange assembly 8 and tertiary heat exchange assembly 6 in proper order, exhaust gas pipeline along the direction of admitting air with the heating passageway intercommunication of tertiary heat exchange assembly 6, second grade heat exchange assembly 8 and one-level heat exchange assembly 10 in proper order. Specifically, the exhaust gas pipeline comprises a first exhaust gas pipe 13, a second exhaust gas pipe 14 and a third exhaust gas pipe 15, wherein the first exhaust gas pipe 13 is used for connecting the third heat exchange assembly 6 and the second heat exchange assembly 8, the second exhaust gas pipe 14 is used for connecting the second heat exchange assembly 8 and the first heat exchange assembly 10, and the third exhaust gas pipe 15 is used for connecting the first heat exchange assembly 10 and the incineration furnace 5.
The flue gas pipeline comprises a first flue gas pipe 16, a second flue gas pipe 17 and a third flue gas pipe 18, wherein the first flue gas pipe 16 is used for connecting the primary heat exchange assembly 10 with the incineration furnace 5, the second flue gas pipe 17 is used for connecting the primary heat exchange assembly 10 with the secondary heat exchange assembly 8, and the third flue gas pipe 18 is used for connecting the secondary heat exchange assembly 8 with the tertiary heat exchange assembly 6. Specifically, the flue gas pipeline is L-shaped, so that the whole structure of the waste gas treatment incineration device is more compact, and the occupied area is saved.
The heat exchange assembly is of a tubular heat exchange structure, the material of the heat exchange tube is generally stainless steel, wax-containing waste gas flows in the tube, treated flue gas flows outside the tube, countercurrent heat exchange is realized between the heat exchange tube and the tube, and if the heat exchange tube needs to be cleaned regularly, the heat exchange tube can be pulled out for cleaning, and the arrangement direction of the tube is parallel to the flow direction of the waste gas.
Gas delivery mechanism: including setting up the exhaust fan 9 on exhaust duct, exhaust fan 9 is located between one-level heat transfer subassembly 10 and the second grade heat transfer subassembly 8, specifically, exhaust fan 9 sets up on second exhaust pipe 14, through the exhaust fan 9 of setting up for waste gas in the dewaxing stove export exhaust duct is convenient for obtain carrying. The gas outlet of the flue gas pipeline is provided with a smoke exhaust fan 3. Through the smoke exhaust fan 3 arranged, the smoke of the smoke pipeline of the incineration hearth 5 is convenient to be conveyed, and the micro negative pressure in the incineration hearth 5 is maintained. The gas conveying mechanism further comprises an air blower 12, wherein the air blower 12 is used for supplementing cold air to the over-temperature flue gas, and the amount of the supplemented cold air can be adjusted according to the temperature requirement of the follow-up dewaxing furnace. Specifically, the outlet of the air blower 12 is communicated with a smoke exhaust pipeline of the smoke exhaust blower 3, and the smoke exhaust pipeline is used for providing circulating gas for the dewaxing furnace. The waste gas fan 9 and the smoke exhaust fan 3 adopt induced draft fans, and the air fan 12 adopts a blower.
When the device is used, in order to ensure the heat exchange effect and save fuel as much as possible, the temperature of the waste gas entering the incineration hearth 5 is above 500 ℃, and the following settings are made for the matching of the temperature of the waste gas and the air quantity of the waste gas fan 9: if the amount of the exhaust gas from the outlet of the dewaxing furnace is 1000Nm 3 And/h, the temperature is 400 ℃, the temperature of the waste gas entering the waste gas fan 9 after two-stage heat exchange can reach more than 450 ℃, and the air quantity range of the waste gas fan 9 is 2600-2800 m 3 Between/h. When the actually required air quantity of the dewaxing furnace is smaller than the flue gas quantity of a flue gas pipeline of the waste gas treatment incineration device, part of the flue gas of the incineration furnace chamber 5 can be emptied, normal-temperature air is extracted through the air blower 12 and mixed with residual flue gas and then is fed into the dewaxing furnace, and in order to ensure the temperature of the dewaxing furnace, the following settings are made for matching the air quantity of mixed air with the flue gas quantity of the dewaxing furnace: if the amount of smoke entering the dewaxing furnace is 1000Nm 3 The temperature was 600℃and the amount of air to be mixed was 500Nm 3 And/h, the temperature is 30 ℃, and the smoke amount after mixing is 1500Nm 3 And/h, the temperature is 410 ℃.
The waste gas treatment incineration device adopts a welding mode between the incineration hearth 5 and the heat exchange unit, adopts a three-stage heat exchange structure, and alternately arranges the gas transmission mechanism at the middle section of the two-stage heat exchange assembly; on the other hand, paraffin is not easy to condense, blocks up the heat exchange assembly and the gas conveying equipment, prolongs the service life of the gas conveying mechanism, and avoids the problems that the paraffin blocks up the catalyst and the heat accumulating type ceramic. The device adopts vertical structure arrangement, integrates an incinerator, a heat exchange unit and a gas conveying unit into a whole, realizes modularization, greatly reduces the occupied area, is quite simple and convenient to install and arrange on site, can be arranged in batches, can be provided with one incinerator, can run simultaneously according to one or more than one dewaxing furnaces, and can be determined according to the number of dewaxing furnace bodies 1.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that other parts not specifically described are within the prior art or common general knowledge to a person of ordinary skill in the art. Modifications and alterations may be made without departing from the principles of this utility model, and such modifications and alterations should also be considered as being within the scope of the utility model.
Claims (8)
1. The waste gas treatment incineration device is characterized by comprising a waste gas incineration mechanism, a waste heat utilization mechanism and a gas conveying mechanism, wherein the waste gas incineration mechanism comprises an incineration hearth, an air inlet and an air outlet are formed in the incineration hearth, the air inlet is connected with a waste gas pipeline, the air outlet is connected with a flue gas pipeline, a fire blocking wall and a waste gas distributor are arranged in the incineration hearth, and an ignition structure is further arranged on the incineration hearth;
waste heat utilization mechanism: the flue gas pipeline is sequentially communicated with heat exchange channels of the primary heat exchange assembly, the secondary heat exchange assembly and the tertiary heat exchange assembly along an air outlet direction, and the waste gas pipeline is sequentially communicated with heating channels of the tertiary heat exchange assembly, the secondary heat exchange assembly and the primary heat exchange assembly along an air inlet direction;
gas delivery mechanism: including setting up the exhaust fan on exhaust duct, exhaust fan is located between first grade heat exchange assembly and the second grade heat exchange assembly, the gas outlet of flue gas duct is provided with exhaust fan.
2. The exhaust gas treatment incineration device according to claim 1, characterised in that the flue gas duct is L-shaped.
3. The exhaust gas treatment incineration device according to claim 1, wherein the exterior of the incineration furnace, the exhaust gas pipeline and the flue gas pipeline are all covered with a heat insulation material.
4. The exhaust gas treatment incineration device according to claim 1, wherein the heat exchange assembly adopts a tubular heat exchange structure.
5. The exhaust gas treatment incineration device according to claim 1, wherein the fire barrier and the exhaust gas distributor are located between the incineration furnace air inlet and the air outlet.
6. The exhaust gas treatment incineration device according to claim 1, wherein an access door is provided on the incineration furnace.
7. The exhaust gas treatment incineration device according to claim 1, wherein the gas delivery mechanism further comprises an air blower for supplementing the super-heated flue gas with cold air.
8. The exhaust gas treatment incinerator according to claim 7, wherein said exhaust gas blower and said smoke exhaust blower are induced draft fans and said air blower is an air blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320493728.7U CN219797221U (en) | 2023-03-15 | 2023-03-15 | Waste gas treatment incineration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320493728.7U CN219797221U (en) | 2023-03-15 | 2023-03-15 | Waste gas treatment incineration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219797221U true CN219797221U (en) | 2023-10-03 |
Family
ID=88176765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320493728.7U Active CN219797221U (en) | 2023-03-15 | 2023-03-15 | Waste gas treatment incineration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219797221U (en) |
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2023
- 2023-03-15 CN CN202320493728.7U patent/CN219797221U/en active Active
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