CN211987856U - Activated carbon box for waste gas treatment - Google Patents
Activated carbon box for waste gas treatment Download PDFInfo
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- CN211987856U CN211987856U CN202020503554.4U CN202020503554U CN211987856U CN 211987856 U CN211987856 U CN 211987856U CN 202020503554 U CN202020503554 U CN 202020503554U CN 211987856 U CN211987856 U CN 211987856U
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- activated carbon
- pipe
- gas treatment
- box
- box body
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 298
- 239000002912 waste gas Substances 0.000 title abstract description 27
- 238000001179 sorption measurement Methods 0.000 claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 29
- 239000007789 gas Substances 0.000 abstract description 26
- 230000001172 regenerating effect Effects 0.000 abstract description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 10
- 230000008929 regeneration Effects 0.000 description 9
- 238000011069 regeneration method Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- IYVLHQRADFNKAU-UHFFFAOYSA-N oxygen(2-);titanium(4+);hydrate Chemical compound O.[O-2].[O-2].[Ti+4] IYVLHQRADFNKAU-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000010815 organic waste Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- -1 printing Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 150000001345 alkine derivatives Chemical class 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000002649 leather substitute Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model relates to a waste gas treatment device technical field especially relates to an activated carbon box for exhaust-gas treatment, include: the box body is provided with an air inlet pipe and an air outlet pipe; the adsorption mechanism is arranged in the box body, and the air inlet pipe and the exhaust pipe are positioned on different sides of the adsorption mechanism; the adsorption mechanism comprises at least one activated carbon plate, a feed pipe and a discharge pipe are arranged on the activated carbon plate, and both the feed pipe and the discharge pipe penetrate through the box body; the heating mechanism is installed in the box body. The utility model solves the problem that the activated carbon box in the prior art can not regenerate the activated carbon and adjust the number of the activated carbon plates inconveniently; the function of regenerating the active carbon on the active carbon plate is realized by designing a heating device; in addition, whether the activated carbon is filled in the activated carbon plate is directly controlled by arranging the feeding pipe and the discharging pipe, and the quantity of the activated carbon plate filled with the activated carbon is directly adjusted, so that the adsorption performance of the activated carbon box is influenced.
Description
Technical Field
The utility model relates to a waste gas treatment device technical field especially relates to an activated carbon box for exhaust-gas treatment.
Background
In the industrial production process, industries such as chemical industry, synthetic leather, coating, printing, plastic cement, rubber, chemical fiber, shoe making, wood industry and the like generate a large amount of organic waste gas, and the toxicity of the organic waste gas in different industries is different.
Activated carbon adsorption is a measure for effectively removing water odor, natural and synthetic dissolved organic matters, micro pollutants and the like, most of relatively large organic matter molecules, aromatic compounds, halogenated alkynes and the like can be firmly adsorbed on the surface or in gaps of the activated carbon, and the activated carbon is used as an advanced purification process, is often used for final treatment of wastewater and can also be used for purification treatment of long-term water and domestic water.
The industrial waste gas generally adopts an activated carbon adsorption method: the waste gas is adsorbed by the activated carbon, when the adsorption is saturated, the activated carbon is desorbed and regenerated, the waste gas is blown off and then is catalytically combusted, the waste gas is converted into harmless substances, and the regenerated activated carbon is continuously used. When the activated carbon is regenerated for a certain number of times, the adsorption capacity is obviously reduced, and the activated carbon needs to be updated.
Chinese utility model patent CN201920258351.0 discloses an external activated carbon box structure of UV photolysis odor removing equipment, activated carbon box include interior box, pull formula activated carbon unit, interior box divides two-layer from top to bottom, and every layer is installed two rows of pull formula activated carbon units at least, activated carbon box one side is provided with the door discharge and is fixed with the door frame through the hinge, and the front end of box is provided with the air intake, and the rear end of box is provided with the air outlet, and this technical scheme's activated carbon box comprises two independent pull formula activated carbon units at least, and every activated carbon unit and adjacent activated carbon unit mutually noninterfere, and the active carbon preparation is made the type in addition, and the shape is convenient for put for hexahedron type, because the volume that the active carbon was made is enough big, so adsorption affinity is strong, after using a period, can go out the activated carbon unit that will change according to use pull situation. Through the quantity of the active carbon board in the independent pull formula active carbon unit control active carbon box of design, but need take out at every turn in advance or put into the active carbon board and adjust, need open the active carbon box this moment, can increase the contact time of active carbon board and air, influence its adsorption efficiency. In addition, the activated carbon regeneration also needs to take out the activated carbon plate for regeneration, and the operation is inconvenient.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide an activated carbon box for waste gas treatment, which is used to solve the problem that the activated carbon box in the prior art cannot regenerate activated carbon and adjust the number of activated carbon plates so as to be inconvenient. The utility model realizes the function of regenerating the active carbon on the active carbon plate by designing the heating device; in addition, whether the activated carbon is filled in the activated carbon plate is directly controlled by arranging the feeding pipe and the discharging pipe, and the quantity of the activated carbon plate filled with the activated carbon is directly adjusted, so that the adsorption performance of the activated carbon box is influenced.
To achieve the above and other related objects, the present invention provides an activated carbon box for exhaust gas treatment, the activated carbon box comprising:
the air inlet pipe and the air outlet pipe are arranged on the box body;
the adsorption mechanism is arranged in the box body, and the air inlet pipe and the exhaust pipe are positioned on different sides of the adsorption mechanism; the adsorption mechanism comprises at least one activated carbon plate, a feed pipe and a discharge pipe are arranged on the activated carbon plate, and both the feed pipe and the discharge pipe penetrate through the box body;
a heating mechanism mounted in the case.
The activated carbon, if used to adsorb gases, is regenerable; if the solid is adsorbed, the solid has no value of being reused; if the cleaning agent is used for industrial decontamination, the cleaning agent can be used only once.
The activated carbon box is used for treating waste gas, and the air inlet pipe and the exhaust pipe are positioned on different sides of the adsorption mechanism so as to ensure that the waste gas is exhausted after being adsorbed by the adsorption mechanism. The activated carbon plate is provided with a feed pipe and a discharge pipe for directly filling or taking out activated carbon; when the concentration of harmful substances in the waste gas is low, less active carbon is used for filtering, and the quantity of the active carbon plates filled with the active carbon is controlled; when the concentration of harmful substances in the waste gas is higher, more activated carbon is required to be filtered, and the number of the activated carbon plates filled with the activated carbon is increased. Whether activated carbon is filled in the activated carbon plate is directly controlled through the feeding pipe and the discharging pipe, and the quantity of the activated carbon plate filled with the activated carbon is directly adjusted, so that the adsorption performance of the activated carbon box is influenced.
If the activated carbon is used for adsorbing gas, the regeneration can be realized generally by heating (200 ℃ and 2 hours), the waste gas is blown off and then is catalytically combusted, so that the waste gas is converted into harmless substances, and the regenerated activated carbon is continuously used. Above-mentioned activated carbon box is through setting up heating mechanism, avoids taking out the regeneration with the activated carbon board, also need not pack into again after the regeneration, and is more convenient to operating personnel. In addition, the situation that the adsorption performance of the activated carbon plate and the activated carbon is influenced by the direct contact with air is avoided. The activated carbon is directly regenerated in the process that the activated carbon box does not process waste gas, so that the activated carbon box is prevented from being disassembled.
In an embodiment of the present invention, the box is installed on the base, the intake pipe and the exhaust pipe are disposed on different sides of the box. The air inlet pipe and the exhaust pipe are arranged on different sides of the box body, so that waste gas is prevented from being directly discharged without passing through the adsorption mechanism.
In an embodiment of the present invention, the adsorption mechanism is disposed between the intake pipe and the exhaust pipe. The adsorption mechanism is arranged between the air inlet pipe and the exhaust pipe so as to ensure that waste gas is discharged after being treated by the adsorption mechanism.
In an embodiment of the present invention, the intake pipe is provided with a filter screen, and the exhaust pipe is provided with a gas concentration sensor. The filter screen is arranged on the air inlet pipe, so that the solid particles are prevented from being brought into the regeneration performance of the activated carbon. The exhaust pipe is provided with the gas concentration sensor so as to check the waste gas treatment rate of the activated carbon box, and the adsorption performance of the activated carbon can also be reflected by the numerical value of the gas concentration sensor. When the numerical value of the gas concentration sensor is obviously increased, the adsorption efficiency of the activated carbon in the activated carbon box is low, and if the number of the activated carbon plates filled with the activated carbon is small, the activated carbon is added through the feeding pipe; if the adsorption of the activated carbon reaches saturation, the activated carbon needs to be regenerated or renewed.
The gas concentration sensor is mainly used for sensing the concentration of exhaust gas emission. Among them, the most important are an oxygen sensor, a zirconia sensor (use temperature-40 ℃ to 900 ℃ with 1% accuracy), a zirconia concentration cell type gas sensor (use temperature 300 ℃ to 800 ℃), a solid electrolyte type zirconia gas sensor (use temperature 0 ℃ to 400 ℃ with 0.5% accuracy), and a titania oxygen sensor. Compared with a zirconia sensor, the titanium dioxide oxygen sensor has the characteristics of simple structure, lightness, cheapness and strong lead pollution resistance.
In an embodiment of the present invention, the adsorption mechanism includes a plurality of activated carbon plates, and the activated carbon plates are spaced apart from each other and disposed in the adsorption mechanism. A plurality of activated carbon plates are designed and arranged at intervals; when the concentration of harmful substances in the waste gas is low, less active carbon is used for filtering, and the quantity of the active carbon plates filled with the active carbon is controlled; when the concentration of harmful substances in the waste gas is higher, more activated carbon is required to be filtered, and the number of the activated carbon plates filled with the activated carbon is increased.
In an embodiment of the present invention, the activated carbon plate includes a first fixing plate and a second fixing plate which are disposed in parallel, the first fixing plate and the second fixing plate are connected to the box body, and the first fixing plate and the second fixing plate are provided with air holes. First fixed plate and second fixed plate are connected as an organic whole with the box, and first fixed plate and second fixed plate parallel arrangement, and from this first fixed plate, second fixed plate and box three form a cavity region and are used for filling the active carbon, and inlet pipe and discharging pipe all run through the box to pack the active carbon into or go out in the cavity region. Initiation of gas production through gas-permeable holes
In an embodiment of the present invention, the intake pipe, the exhaust pipe, the inlet pipe and the discharge pipe are all provided with a valve. The opening and the closing of the valve are controlled by designing the valve.
In an embodiment of the present invention, the exhaust pipe is provided with a fan. The power is provided by designing a fan.
In an embodiment of the present invention, the heating mechanism is a heating wire.
As mentioned above, the utility model discloses an activated carbon box for exhaust-gas treatment has following beneficial effect: the activated carbon box is used for treating waste gas, and the air inlet pipe and the exhaust pipe are positioned on different sides of the adsorption mechanism so as to ensure that the waste gas is exhausted after being adsorbed by the adsorption mechanism. The active carbon box is characterized in that the active carbon plate is provided with a feeding pipe and a discharging pipe, so that active carbon can be directly filled or taken out, whether the active carbon is filled in the active carbon plate is directly controlled through the feeding pipe and the discharging pipe, the number of the active carbon plates filled with the active carbon is directly adjusted, and the adsorption performance of the active carbon box is influenced. Above-mentioned activated carbon box is through setting up heating mechanism, avoids taking out the regeneration with the activated carbon board, also need not pack into again after the regeneration, and is more convenient to operating personnel. In addition, the situation that the adsorption performance of the activated carbon plate and the activated carbon is influenced by the direct contact with air is avoided.
Drawings
Fig. 1 is a schematic overall view of an activated carbon box for exhaust gas treatment according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an interior of an activated carbon box for exhaust gas treatment according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating a state where an adsorption mechanism is not installed in an activated carbon box for waste gas treatment according to an embodiment of the present invention.
Fig. 4 is a schematic view showing the connection between the box body and the base in the activated carbon box for waste gas treatment according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an adsorption mechanism in an activated carbon box for waste gas treatment according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of an activated carbon plate in an activated carbon box for waste gas treatment according to an embodiment of the present invention.
Fig. 7 is a partial schematic view of an inlet pipe in an activated carbon box for exhaust gas treatment according to an embodiment of the present invention.
Description of the element reference numerals
1-a box body; 2, an air inlet pipe; 3-an exhaust pipe; 4-filtering with a filter screen; 5-a gas concentration sensor; 6-an activated carbon plate, 601-a first fixing plate, 602-a second fixing plate, and 603-air holes; 7-a feed pipe; 8-a discharge pipe; 9-heating wires; 10-a base; 11-a fan; 12-valve.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1 to 7. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides an activated carbon box for exhaust gas treatment, the activated carbon box comprising:
referring to fig. 4, a box body 1, an air inlet pipe 2 and an air outlet pipe 3 are arranged on different sides of the box body 1; referring to fig. 7, a filter screen 4 is disposed on the air inlet pipe 2; a gas concentration sensor 5 is arranged on the exhaust pipe 3, and the gas concentration sensor 5 is a titanium dioxide oxygen sensor;
referring to fig. 5, the adsorption mechanism is installed in the box body 1; referring to fig. 2, the adsorption mechanism is disposed between the intake pipe 2 and the exhaust pipe 3; the adsorption mechanism comprises five activated carbon plates 6, and the activated carbon plates 6 are arranged in the adsorption mechanism at intervals; referring to fig. 6, the activated carbon plate 6 includes a first fixing plate 601 and a second fixing plate 602 which are arranged in parallel, the first fixing plate 601 and the second fixing plate 602 are connected with the box body 1 as a whole, and the first fixing plate 601 and the second fixing plate 602 are both provided with air holes 603; a feed pipe 7 and a discharge pipe 8 are arranged on the activated carbon plate 6, and the feed pipe 7 and the discharge pipe 8 penetrate through the box body 1;
referring to fig. 3, a heating wire 9, the heating wire 9 being installed in the cabinet 1;
referring to fig. 1, a base 10, wherein the box body 1 is installed on the base 10, and a fan 11 is installed on the exhaust pipe 3;
wherein, all install valve 12 on intake pipe 2, blast pipe 3, inlet pipe 7 and the discharging pipe 8.
The working process is as follows: the valve 12 of the air inlet pipe 2 and the air outlet pipe 3 is opened, the fan 11 is opened, the waste gas enters the box body 1 through the air inlet pipe 2, and is adsorbed by the activated carbon in the activated carbon plate 6 and then is discharged through the air outlet pipe 3.
When the numerical value of the titanium dioxide oxygen sensor is obviously increased, the adsorption efficiency of the activated carbon in the activated carbon box is low, and if the number of the activated carbon plates 6 filled with the activated carbon is small, the activated carbon is added through the feeding pipe 7; if the adsorption of the activated carbon reaches saturation, the activated carbon needs to be regenerated or renewed. The regeneration is specifically that the heating wire 9 is heated until the temperature of the box body 1 is 200 ℃, the temperature is maintained for about 2 hours, the valve 12 of the exhaust pipe 3 needs to be opened in the heating process, and the exhaust pipe 3 is communicated with the catalytic combustion device. And the updating is to open a valve 12 of the discharge pipe 8 and discharge the activated carbon.
Example 2 is different from example 1 in that the gas concentration sensor is a zirconia oxide sensor, and the rest is the same as example 1.
In summary, the utility model realizes the function of regenerating the active carbon on the active carbon plate 6 by designing the heating device; in addition, whether the activated carbon is filled in the activated carbon plate 6 is directly controlled by arranging the feeding pipe 7 and the discharging pipe 8, and the quantity of the activated carbon plates 6 filled with the activated carbon is directly adjusted, so that the adsorption performance of the activated carbon box is influenced. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. An activated carbon tank for exhaust gas treatment, characterized in that the activated carbon tank comprises:
the refrigerator comprises a box body (1), wherein an air inlet pipe (2) and an air outlet pipe (3) are arranged on the box body (1);
the adsorption mechanism is arranged in the box body (1), and the air inlet pipe (2) and the air outlet pipe (3) are positioned on different sides of the adsorption mechanism; the adsorption mechanism comprises at least one activated carbon plate (6), a feed pipe (7) and a discharge pipe (8) are arranged on the activated carbon plate (6), and the feed pipe (7) and the discharge pipe (8) penetrate through the box body (1);
a heating mechanism installed in the case (1).
2. An activated carbon tank for exhaust gas treatment according to claim 1, characterized in that: the box body (1) is installed on the base (10), and the air inlet pipe (2) and the exhaust pipe (3) are arranged on different sides of the box body (1).
3. An activated carbon tank for exhaust gas treatment according to claim 1, characterized in that: the adsorption mechanism is arranged between the air inlet pipe (2) and the exhaust pipe (3).
4. An activated carbon tank for exhaust gas treatment according to any one of claims 1 to 3, characterized in that: the air inlet pipe (2) is provided with a filter screen (4), and the exhaust pipe (3) is provided with a gas concentration sensor (5).
5. An activated carbon tank for exhaust gas treatment according to claim 1 or 3, characterized in that: the adsorption mechanism comprises a plurality of activated carbon plates (6), and the activated carbon plates (6) are arranged in the adsorption mechanism at intervals.
6. An activated carbon tank for exhaust gas treatment according to claim 1, characterized in that: activated carbon plate (6) including parallel arrangement's first fixed plate (601) and second fixed plate (602), first fixed plate (601) with second fixed plate (602) all with box (1) is connected as an organic wholely, first fixed plate (601) with all be provided with bleeder vent (603) on second fixed plate (602).
7. An activated carbon tank for exhaust gas treatment according to claim 1, characterized in that: all install valve (12) on intake pipe (2), blast pipe (3), inlet pipe (7) and discharging pipe (8).
8. An activated carbon tank for exhaust gas treatment according to claim 1 or 7, characterized in that: and a fan (11) is arranged on the exhaust pipe (3).
9. An activated carbon tank for exhaust gas treatment according to claim 1, characterized in that: the heating mechanism is a heating wire (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020503554.4U CN211987856U (en) | 2020-04-08 | 2020-04-08 | Activated carbon box for waste gas treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020503554.4U CN211987856U (en) | 2020-04-08 | 2020-04-08 | Activated carbon box for waste gas treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211987856U true CN211987856U (en) | 2020-11-24 |
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ID=73405132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020503554.4U Expired - Fee Related CN211987856U (en) | 2020-04-08 | 2020-04-08 | Activated carbon box for waste gas treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211987856U (en) |
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2020
- 2020-04-08 CN CN202020503554.4U patent/CN211987856U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
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