CN213326761U - Equipment for producing ammonium bicarbonate by recycling coking wastes - Google Patents
Equipment for producing ammonium bicarbonate by recycling coking wastes Download PDFInfo
- Publication number
- CN213326761U CN213326761U CN202022274179.3U CN202022274179U CN213326761U CN 213326761 U CN213326761 U CN 213326761U CN 202022274179 U CN202022274179 U CN 202022274179U CN 213326761 U CN213326761 U CN 213326761U
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- Prior art keywords
- tower
- carbon dioxide
- water
- energy recovery
- ammonium bicarbonate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004939 coking Methods 0.000 title claims abstract description 39
- 239000002699 waste material Substances 0.000 title claims abstract description 21
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 title claims abstract description 19
- 235000012538 ammonium bicarbonate Nutrition 0.000 title claims abstract description 19
- 239000001099 ammonium carbonate Substances 0.000 title claims abstract description 19
- 238000004064 recycling Methods 0.000 title claims abstract description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 126
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 63
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 63
- 238000011084 recovery Methods 0.000 claims abstract description 38
- 239000002912 waste gas Substances 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 17
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims description 27
- 238000010521 absorption reaction Methods 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000004458 analytical method Methods 0.000 claims description 22
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005201 scrubbing Methods 0.000 abstract 6
- 239000007789 gas Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000003763 carbonization Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Gas Separation By Absorption (AREA)
Abstract
The utility model discloses a coking waste recycling produces ammonium bicarbonate equipment, comprising a base plate, be provided with heat recovery unit on the bottom plate left side up end, and heat recovery unit left side is connected with the forced draught fan to be connected with the waste gas entry on the forced draught fan left surface, heat recovery unit right side has the scrubbing tower through the air flow pipe connection, and the scrubbing tower inboard is provided with the filter, be provided with the water pump on the bottom plate on scrubbing tower right side, and both ends are connected about the water pump leads to pipe and the scrubbing tower, the scrubbing tower right side is provided with the cooling tower, and the scrubbing tower top is connected with the cooling tower through the air flow pipe, the cooling tower right side is provided with the base. This coking waste recycling produces ammonium bicarbonate equipment can be convenient for carry out recycle to the carbon dioxide waste gas and the surplus aqueous ammonia that produce among the coking process to reduce the harm of coking process to the environment, and can be convenient for make the coking waste treatment energy-concerving and environment-protective more.
Description
Technical Field
The utility model relates to a coking waste recycling technology field specifically is a coking waste recycling production ammonium bicarbonate equipment.
Background
Coking generally refers to the process of carbonization and zooming of organic substances, and refers to high-temperature carbonization in carbonization of coal, and in petroleum processing, coking is a short term for residual oil coking, and is a process of deep cracking and condensation reaction at a high temperature of about 500 ℃ to produce gas, gasoline, diesel oil, wax oil and petroleum coke, wherein a large amount of carbon dioxide and nitrogen are produced in waste gas produced in the coking process, and residual ammonia water is produced in a coking cold drum section.
However, carbon dioxide and nitrogen generated in the existing coking process are generally directly discharged into the atmosphere, the carbon dioxide belongs to greenhouse gas, the greenhouse effect is aggravated by excessive discharge of the carbon dioxide, residual ammonia water can be generated in a coking cold drum working section, resources can be wasted due to no reasonable utilization, waste treatment energy consumption is large in the existing coking process, energy-saving and environment-friendly production is insufficient, and therefore equipment for recycling coking waste to produce ammonium bicarbonate is needed to solve the problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coking waste recycling produces ammonium bicarbonate equipment to the discarded object that proposes current coking process and produce causes harm and the not enough energy-concerving and environment-protective problem of production to the environment in solving above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: an equipment for producing ammonium bicarbonate by recovering coking wastes comprises a bottom plate, wherein a heat energy recovery device is arranged on the upper end surface of the left side of the bottom plate, a pressurizing fan is connected to the left side of the heat energy recovery device, a waste gas inlet is connected to the left side surface of the pressurizing fan, a washing tower is connected to the right side of the heat energy recovery device through an air flow pipeline, a filter plate is arranged on the inner side of the washing tower, a water pump is arranged on the bottom plate on the right side of the washing tower and is connected with the upper end and the lower end of the washing tower through water pipes, a cooling tower is arranged on the right side of the washing tower, the top end of the washing tower is connected with the cooling tower through an air flow pipeline, a base is arranged on the right side of the cooling tower and is connected with a carbon dioxide absorption tower, the side surface of the cooling tower, and carbon dioxide absorption tower is connected through the water pipe with carbon dioxide analysis tower, carbon dioxide analysis tower left side is provided with the retort, and carbon dioxide analysis tower top is connected with the retort through the air flow pipeline, retort left side upper end is provided with the aqueous ammonia entry, and the retort bottom surface is provided with the discharge gate, the retort left side is provided with water circle device, and the inside water storage cavity that is provided with of retort to the inside water storage cavity that is provided with of heat recovery device, both ends lead to pipe and water circle device about the heat recovery device are connected, and both ends lead to pipe and water circle device about the retort left side are connected.
Preferably, the heat-insulating layer is arranged on the surface of the outer side of the heat energy recovery device, and the inner side wall of the heat energy recovery device is made of high-performance heat-conducting materials.
Preferably, a heat-insulating layer sleeve is arranged on the outer surface of the water pipe, and the heat-insulating layer sleeve on the water pipe is made of silicate heat-insulating materials.
Preferably, the upper end and the lower end of the side surface of the reaction tank are respectively provided with a water inlet and a water outlet, and the upper end and the lower end of the outer surface of the heat energy recovery device are respectively provided with a water inlet and a water outlet.
Preferably, the bottom surface of the carbon dioxide absorption tower is higher than the bottom surface of the carbon dioxide analysis tower, and an included angle of 30 degrees is formed between a water pipe between the carbon dioxide absorption tower and the carbon dioxide analysis tower and the horizontal plane.
Preferably, the filter plate is provided with a filter hole, and a water inlet on the water pump is arranged on the outer wall of the washing tower on the lower side of the filter plate.
Compared with the prior art, the beneficial effects of the utility model are that: this coking waste recycling produces ammonium bicarbonate equipment can be convenient for carry out recycle to the carbon dioxide waste gas and the surplus aqueous ammonia that the coking in-process produced to reduce the harm of coking process to the environment, and can be convenient for make the coking waste treatment energy-concerving and environment-protective more:
1. carbon dioxide gas enters the reaction tank through the gas flow pipeline, residual ammonia water generated in the coking process is added into the reaction tank through the ammonia water inlet, and the carbon dioxide and the ammonia water react to prepare ammonium bicarbonate, so that the problem that the carbon dioxide waste gas of a coking enterprise is discharged into the atmosphere is solved, the emission reduction of the carbon dioxide is achieved, and considerable economic benefits and remarkable social environmental benefits are obtained;
2. the hot water in the heat energy recovery device is circulated to the water storage cavity of the reaction tank through the water circulation device in the preparation process, and the hot water enters the water storage cavity of the reaction tank and then heats the inside of the reaction tank, so that the reaction speed is increased, the waste heat in the waste gas is utilized, and the coking waste treatment is more energy-saving and environment-friendly.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a right side view of the structure of the present invention;
fig. 3 is a schematic rear view of the present invention;
FIG. 4 is a front view of the cross-sectional structure of the present invention;
fig. 5 is a schematic view of the rear view cross-sectional structure of the present invention.
In the figure: 1. a base plate; 2. a water circulation device; 3. an exhaust gas inlet; 4. a booster fan; 5. a heat energy recovery device; 6. a water pipe; 7. an ammonia water inlet; 8. a washing tower; 9. an air flow conduit; 10. a reaction tank; 11. a cooling tower; 12. an exhaust port; 13. a carbon dioxide absorption tower; 14. a carbon dioxide desorption tower; 15. a base; 16. a water pump; 17. a water storage cavity; 18. a filter plate; 19. and (4) a discharge port.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: an apparatus for producing ammonium bicarbonate by recycling coking wastes comprises a bottom plate 1, a water circulation device 2, a waste gas inlet 3, a pressurizing fan 4, a heat energy recovery device 5, a water pipe 6, an ammonia water inlet 7, a washing tower 8, an air flow pipeline 9, a reaction tank 10, a cooling tower 11, an exhaust port 12, a carbon dioxide absorption tower 13, a carbon dioxide analysis tower 14, a base 15, a water pump 16, a water storage cavity 17, a filter plate 18 and a discharge port 19, wherein the heat energy recovery device 5 is arranged on the upper end surface of the left side of the bottom plate 1, the pressurizing fan 4 is connected to the left side of the heat energy recovery device 5, the waste gas inlet 3 is connected to the left side of the pressurizing fan 4, the washing tower 8 is connected to the right side of the heat energy recovery device 5 through the air flow pipeline 9, the filter plate 18 is arranged on the inner side of the washing tower 8, the water pump 16 is, a cooling tower 11 is arranged on the right side of a washing tower 8, the top end of the washing tower 8 is connected with the cooling tower 11 through an airflow pipeline 9, a base 15 is arranged on the right side of the cooling tower 11, a carbon dioxide absorption tower 13 is connected on the base 15, the side surface of the cooling tower 11 is connected with the carbon dioxide absorption tower 13 through an airflow pipeline 9, an exhaust port 12 is arranged on the top end of the carbon dioxide absorption tower 13, a carbon dioxide analysis tower 14 is arranged on the front end of the carbon dioxide absorption tower 13, the carbon dioxide absorption tower 13 is connected with the carbon dioxide analysis tower 14 through a water pipe 6, a reaction tank 10 is arranged on the left side of the carbon dioxide analysis tower 14, the top end of the carbon dioxide analysis tower 14 is connected with the reaction tank 10 through an airflow pipeline 9, an ammonia water inlet 7 is arranged on the upper end of the left side of the reaction tank 10, a discharge port 19, and the inside water storage cavity 17 that is provided with of heat recovery unit 5, both ends are connected with water circle device 2 through water pipe 6 about heat recovery unit 5, and both ends are connected with water circle device 2 through water pipe 6 about retort 10 left side.
The heat preservation layer is arranged on the surface of the outer side of the heat energy recovery device 5, the inner side wall of the heat energy recovery device 5 is made of high-performance heat conducting materials, heat in waste gas can be conducted to the inner wall of the heat energy recovery device 5 conveniently, water in the water storage cavity 17 on the heat energy recovery device 5 is heated, and heat preservation can be conducted to the water in the water storage cavity 17 conveniently.
The heat preservation sleeve is arranged on the outer surface of the water pipe 6, the heat preservation sleeve on the water pipe 6 is made of silicate heat preservation materials, heat loss of water flow can be reduced conveniently through the heat preservation sleeve on the water pipe 6, and therefore the heat recovery utilization rate of waste gas is improved.
The upper end and the lower extreme of 10 sides of retort are provided with water inlet and delivery port respectively, and 5 surface upper ends of heat recovery unit and lower extreme are provided with water inlet and delivery port respectively, can be convenient for carry out the circulation flow with retort 10 in the water storage cavity 17 on heat recovery unit 5 through water circle device 2 to heat in the retort 10, and can be convenient for improve the production of the interior raw materials of retort 10 and answer efficiency.
The bottom surface of the carbon dioxide absorption tower 13 is higher than the bottom surface of the carbon dioxide analysis tower 14, and an included angle of 30 degrees is formed between the water pipe 6 between the carbon dioxide absorption tower 13 and the carbon dioxide analysis tower 14 and the horizontal plane, so that the barren solution in the carbon dioxide absorption tower 13 can flow into the carbon dioxide analysis tower 14 conveniently through the height difference between the carbon dioxide absorption tower 13 and the carbon dioxide analysis tower 14, and energy can be saved by reducing conveying equipment conveniently.
Be provided with the filtration pore on the filter 18, and the water inlet on the water pump 16 sets up on the washing tower 8 outer wall of filter 18 downside, can be convenient for carry water to washing tower 8 upper end through water pump 16 and rinse waste gas, and can be convenient for filter waste water through filter 18 to the use of fresh water resource can be convenient for practice thrift.
The working principle is as follows: firstly, waste gas generated by coking is introduced into a waste gas inlet 3, the waste gas is pressurized by a pressurizing fan 4 and then enters a heat energy recovery device 5, heat in the waste gas is absorbed by the inner wall of the heat energy recovery device 5 to heat water in a water storage cavity 17 inside the heat energy recovery device, the coking waste gas enters a washing tower 8 through an airflow pipeline 9, a water pump 16 on the side surface of the washing tower 8 conveys water at the bottom of the coking waste gas to the upper end of the washing tower 8 to clean the waste gas, and a filter plate 18 in the washing tower 8 filters the washing water;
the cleaned waste gas enters a cooling tower 11 through an airflow pipeline 9 to be cooled, the cooled waste gas enters a carbon dioxide absorption tower 13, carbon dioxide gas is fused with lean solution in the carbon dioxide absorption tower 13, other gas is discharged through an exhaust port 12 at the top end of the carbon dioxide absorption tower 13, the lean solution in the carbon dioxide absorption tower 13 absorbs carbon dioxide, then flows into a carbon dioxide analysis tower 14 through a water pipe 6, and is reduced into carbon dioxide gas through the carbon dioxide analysis tower 14;
carbon dioxide gas enters the reaction tank 10 through the gas flow pipeline 9, residual ammonia water generated in the coking process is added through the ammonia water inlet 7, the carbon dioxide and the ammonia water react to prepare ammonium bicarbonate, the water circulating device 2 circulates hot water in the heat energy recovery device 5 to the water storage cavity 17 of the reaction tank 10 in the preparation process, so that the temperature inside the reaction tank 10 is increased, the reaction speed is improved, the ammonium bicarbonate after the reaction can be taken out from the discharge hole 19 at the bottom of the reaction tank 10, and the content which is not described in detail in the specification belongs to the prior art which is known by technicians in the field.
It is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be construed as limiting the scope of the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a coking waste retrieves production ammonium bicarbonate equipment, includes bottom plate (1), its characterized in that: the device is characterized in that a heat energy recovery device (5) is arranged on the upper end face of the left side of the bottom plate (1), the left side of the heat energy recovery device (5) is connected with a booster fan (4), the left side face of the booster fan (4) is connected with a waste gas inlet (3), the right side of the heat energy recovery device (5) is connected with a washing tower (8) through an air flow pipeline (9), a filter plate (18) is arranged on the inner side of the washing tower (8), a water pump (16) is arranged on the bottom plate (1) on the right side of the washing tower (8), the water pump (16) is connected with the upper end and the lower end of the washing tower (8) through a water pipe (6), a cooling tower (11) is arranged on the right side of the washing tower (8), the top end of the washing tower (8) is connected with the cooling tower (11) through the air flow pipeline (9), a, the cooling tower (11) side is connected with a carbon dioxide absorption tower (13) through an airflow pipeline (9), the top end of the carbon dioxide absorption tower (13) is provided with an exhaust port (12), the front end of the carbon dioxide absorption tower (13) is provided with a carbon dioxide analysis tower (14), the carbon dioxide absorption tower (13) is connected with the carbon dioxide analysis tower (14) through a water pipe (6), the left side of the carbon dioxide analysis tower (14) is provided with a reaction tank (10), the top end of the carbon dioxide analysis tower (14) is connected with the reaction tank (10) through an airflow pipeline (9), the upper end of the left side of the reaction tank (10) is provided with an ammonia water inlet (7), the bottom surface of the reaction tank (10) is provided with a discharge port (19), the left side of the reaction tank (10) is provided with a water circulating device (2), and the inside of the reaction tank, and a water storage cavity (17) is arranged in the heat energy recovery device (5), the upper end and the lower end of the heat energy recovery device (5) are connected with the water circulation device (2) through water pipes (6), and the upper end and the lower end of the left side of the reaction tank (10) are connected with the water circulation device (2) through the water pipes (6).
2. The equipment for producing the ammonium bicarbonate by recycling the coking waste according to the claim 1 is characterized in that: the heat-preservation layer is arranged on the surface of the outer side of the heat energy recovery device (5), and the inner side wall of the heat energy recovery device (5) is made of high-performance heat-conducting materials.
3. The equipment for producing the ammonium bicarbonate by recycling the coking waste according to the claim 1 is characterized in that: and a heat-insulating layer sleeve is arranged on the outer surface of the water pipe (6), and the heat-insulating layer sleeve on the water pipe (6) is made of silicate heat-insulating material.
4. The equipment for producing the ammonium bicarbonate by recycling the coking waste according to the claim 1 is characterized in that: the upper end and the lower end of the side surface of the reaction tank (10) are respectively provided with a water inlet and a water outlet, and the upper end and the lower end of the outer surface of the heat energy recovery device (5) are respectively provided with a water inlet and a water outlet.
5. The equipment for producing the ammonium bicarbonate by recycling the coking waste according to the claim 1 is characterized in that: the bottom surface of the carbon dioxide absorption tower (13) is higher than the bottom surface of the carbon dioxide analysis tower (14), and an included angle of 30 degrees is formed between a water pipe (6) between the carbon dioxide absorption tower (13) and the carbon dioxide analysis tower (14) and the horizontal plane.
6. The equipment for producing the ammonium bicarbonate by recycling the coking waste according to the claim 1 is characterized in that: the filter plate (18) is provided with filter holes, and a water inlet of the water pump (16) is arranged on the outer wall of the washing tower (8) at the lower side of the filter plate (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022274179.3U CN213326761U (en) | 2020-10-14 | 2020-10-14 | Equipment for producing ammonium bicarbonate by recycling coking wastes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022274179.3U CN213326761U (en) | 2020-10-14 | 2020-10-14 | Equipment for producing ammonium bicarbonate by recycling coking wastes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213326761U true CN213326761U (en) | 2021-06-01 |
Family
ID=76071613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022274179.3U Expired - Fee Related CN213326761U (en) | 2020-10-14 | 2020-10-14 | Equipment for producing ammonium bicarbonate by recycling coking wastes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213326761U (en) |
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2020
- 2020-10-14 CN CN202022274179.3U patent/CN213326761U/en not_active Expired - Fee Related
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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: 20210601 |