CN207524973U - A kind of iodine retracting device using waste heat boiler exiting flue gas - Google Patents
A kind of iodine retracting device using waste heat boiler exiting flue gas Download PDFInfo
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- CN207524973U CN207524973U CN201721530041.7U CN201721530041U CN207524973U CN 207524973 U CN207524973 U CN 207524973U CN 201721530041 U CN201721530041 U CN 201721530041U CN 207524973 U CN207524973 U CN 207524973U
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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
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model is related to iodine recycling field, especially a kind of iodine retracting device using waste heat boiler exiting flue gas forms iodine retracting device by iodine extraction cells, iodine reduction unit, iodine clean unit；Iodine extraction cells are connect by pipe a with iodine reduction unit, and iodine reduction unit is connect by pipe b with iodine clean unit；So that the safety of iodine retracting device is improved, the risk of environmentally friendly accident is reduced, increases the continuity and economic benefit of production.
Description
Technical field
The utility model is related to iodine recycling field, especially a kind of iodine retracting device using waste heat boiler exiting flue gas.
Background technology
Iodine is known as biological element, wisdom element, is plant and the indispensable element of growth in humans, be manufacture it is inorganic or
The primary raw material of organic iodide and the good catalyst of many chemical reactions.Iodate chemical product is widely used in food, doctor
All conglomeraties such as medicine, dyestuff, metallurgy, synthetic rubber, agricultural, national defence hard-core technology.The downstream product of iodine is mostly high added value
Product, such as：Other iodine products such as Potassiumiodate, iodoform, iodate Rhodium, povidone iodine and high poly- iodine.And the production method of iodine is main
There is ion-exchange, active carbon adsorption, solvent signal suppression, the precipitation method (copper method and Yin Fa), organic solvent extractionprocess, special
Catalytic oxidation and air extraction etc..Currently, the production capacity of global iodine is about 20kt/a, and the iodine production capacity in China is about 800t/a,
The consumption of iodine is but 3000-4000t/a, and with annual 5% speed increase.
At present, the iodine recovery method employed in phosphoric acid by wet process, most of is in oxidizer catalytic oxidising acid solution
Iodide ion, by air extract blowout method the iodine molecule in solution is blown into gas phase in absorbing liquid-reducing agent solution, lead to
It crosses reducing agent and iodine molecule is reduced to iodide ion, after iodide ion reaches certain value, oxidant is passed through in absorbing liquid, iodide ion
It is oxidized to iodine molecule again, iodine product is obtained through separation of solid and liquid.
Sulfuric acid acid-making process is substantially：Refined molten sulfur from molten sulphur process sprays into sulfur furnace after used high-pressure pump pressurization,
It is mixed and burned to obtain sulfur dioxide with dried air, after waste heat boiler recycles thermal energy, by catalyzed conversion, absorbs, obtain
To the sulfuric acid of high concentration, tail gas is washed through ammonia reaches state environmental emissioning standard, from smoke stack emission.
In the prior art, have much for the relevant technologies of iodine recycling, document in phosphoric acid by wet process and fluosilicic acid.For example, trip
Respect cutting edge of a knife or a sword, Wu Youli, Xiang Shuanlong《The absorption technique research of iodine molecule in gas phase》, just to the best work of iodine molecule absorption in gas phase
Skill condition is studied, and is：Using sulfurous acid as reducing agent, sulfurous acid solution mass fraction is 8%, reaction temperature 35
DEG C, the iodine gas phase residence time is 15s.For another example, patent 201610779316.4 just has phosphoric acid by wet process progress iodine recycling detailed
Description.
But the prior art of iodine recycling at present, the mode not put into production to raw material sulfur dioxide improve to some extent.It is wet
The sulfur dioxide bottled for high concentration liquid of sulfur dioxide used in the recycling of the iodine of method phosphoric acid and fluosilicic acid, buffered tank decompression
Afterwards iodine retracting device system is introduced with pipeline.
Utility model content
In order to solve technical problem in the prior art, the utility model provides a kind of utilization waste heat boiler and exports
The iodine retracting device and its recovery method of flue gas.
It is achieved particular by following technical scheme：
A kind of iodine retracting device using waste heat boiler exiting flue gas is purified single by iodine extraction cells, iodine reduction unit, iodine
Member composition；Iodine extraction cells are connect by pipe a with iodine reduction unit；Iodine reduction unit is connect by pipe b with iodine clean unit.
The pipe a is that the iodine gas in iodine extraction cells is sent into iodine reduction unit；Pipe b is will be in iodine reduction unit
Iodide ion solution is sent into iodine clean unit.
Iodine extraction cells include：Phosphoric acid,diluted and fluosilicic acid pipeline enter catalysis oxidation slot from top, and dioxygen waterpipe is from top
Portion enters catalysis oxidation slot, the blender a in catalysis oxidation slot, and catalysis oxidation slot is connected with upper acid pump, upper acid pump and extraction tower
Interior nozzle a connections, extraction tower top exit are connect with pipe a, and air blower is connect with extraction tower bottom inlet.
Iodine reduction unit includes：Dry air pipeline enters sulfur furnace, and molten sulfur pipeline enters sulfur furnace, sulfur furnace and waste heat
Boiler connects, and waste heat boiler outlet is by pipeline through the pipe between cooling pond, cooling tower bonding pad absorption tower, absorption cycle slot
Road；Pipe a is connect with heat exchanger shell pass entrance, and heat exchanger shell pass outlet is connect with packing material absorbing tower bottom, heat exchanger tube pass outlet
It is connect with cooling tower, cooling tower and cooling pond, cooling pond are connect with charging pump, and charging pump is connect with heat exchanger tube pass entrance；It fills out
Material absorption tower centrum bottom is connect with absorption cycle groove top portion, and absorption cycle slot is connect with circulating pump, circulating pump by threeway and
Nozzle b, pipe b connections in packed absorber.
Iodine clean unit includes：Pipe b is connect with first class purification slot, and calcium carbonate slot is connect with first class purification slot, first class purification
Blender c in slot, first class purification trench bottom are connect with secondary purification groove top portion, and aluminum salt flocculant slot connects with secondary purification slot
It connects, the blender d in secondary purification slot, secondary purification trench bottom is connect with oxidation analysis iodine groove top portion, and dioxygen sink is analysed with oxidation
Iodine slot connects, and the blender e in oxidation analysis iodine slot, oxidation analysis iodine trench bottom is connect with iodine filter, and iodine filter and smart iodine are anti-
Kettle is answered to connect, concentrated sulfuric acid groove is connect with smart Iod R kettle, and smart Iod R kettle outlet at bottom is connect with smart iodine separator.
A kind of method for preparing iodine recycling reducing agent, dry air burns with molten sulfur in sulfur furnace generates sulfur dioxide,
After waste heat boiler recycles thermal energy, by pipeline by the cooling of cooling pond and cooling tower, followed into packed absorber and absorption
Pipeline between annular groove, the solution flowed out from packed absorber absorb.
A kind of iodine recovery method using waste heat boiler exiting flue gas, phosphoric acid,diluted and silicate fluoride solution are reacted with hydrogen peroxide
To iodine molecule, in extraction tower, air is inversely contacted with solution to be taken iodine molecule out of and enters heat exchanger, is reached filler after cooling and is inhaled
Tower bottom is received, is reacted with the circulation solution for absorbing sulfur dioxide, when iodide ion concentration reaches 30-70g/L in solution, into two
Grade purification tank defluorinate removing heavy-metal, is passed through hydrogen peroxide and obtains iodine molecule again, filtered, in concentrated sulfuric acid natural subsidence, after
Filter, obtains iodine product.
The production process that a kind of iodine using waste heat boiler exiting flue gas recycles is that dry air passes through dry air pipeline
Into sulfur furnace, the molten sulfur with entering sulfur furnace by molten sulfur pipeline is mixed and burned generation sulfur dioxide, is returned into waste heat boiler
Thermal energy is received, by pipeline by the cooling of cooling pond and cooling tower, the pipeline between packed absorber and absorption cycle slot,
The solution flowed out from packed absorber absorbs；Phosphoric acid,diluted and silicate fluoride solution enter catalysis by phosphoric acid,diluted and fluosilicic acid pipeline
Oxidation trough is reacted with the hydrogen peroxide for entering catalysis oxidation slot by dioxygen waterpipe, and iodide ion is oxidized to iodine molecule, after reaction
The nozzle a that is pumped in extraction tower by upper acid of solution sprayed in tower, air blower conveying air carries out reverse with solution in tower
Contact, takes out of after the iodine molecule in solution and enters heat exchanger shell pass through pipe a；Cooling water in heat exchanger enters cooling tower, in weight
The lower nature of power effect flows into cooling pond, then be delivered to circulating cooling in heat exchanger tube pass by charging pump；Iodine molecule gas is by changing
After hot device cooling, into packed absorber, iodide ion is reduced into after being absorbed by the reducing agent solution that nozzle b is sprayed, is flowed into together
Absorption cycle slot, then enter by threeway by circulating pump nozzle b and pipeline b in packed absorber；Iodide ion solution enters one
Grade purification tank, solution enter back into secondary purification slot by the calcium carbonate defluorinate from calcium carbonate slot, and from aluminum salt flocculant slot
Aluminum salt flocculant take off lead, mercury, arsenic, enter back into oxidation analysis iodine slot, the hydrogen peroxide of dioxygen sink flows into oxidation analysis iodine slot, in slot
Iodide ion again be oxidized as iodine molecule, after the filtering of iodine filter, into smart Iod R kettle, from concentrated sulfuric acid groove
Natural subsidence in the concentrated sulfuric acid finally by smart iodine separator filtering, obtains iodine product.
The cooling tower is connect with cooling pond, is that the cooling water in cooling tower drop to cooling pond naturally.
Compared with prior art, the technique effect of the utility model is embodied in：
It is made up of iodine extraction cells, iodine reduction unit, iodine clean unit；Iodine extraction cells are restored single by pipe a and iodine
Member connection；Iodine reduction unit is connect by pipe b with iodine clean unit
Relative to the existing bottled sulfur dioxide of high concentration liquid used, waste heat boiler exports in sulfuric acid acid manufacturing processes two
Sulfur oxide flue gas provides continuous sulphur dioxide reduction agent to phosphoric acid by wet process and fluosilicic acid iodine retracting device, reduces transport, storage
Danger and environmentally friendly risk when depositing, replacing steel cylinder, and avoid due to long-distance transport or manufacturer's supply not in time and
Caused by produced on-site interrupt.Market liquid sulfur dioxide purchasing price is expensive simultaneously, and the exiting flue gas of sulphur-burning sulphuric acid plant exists
After being included in cost of material and production supplementary costs, sulfur dioxide cost savings rate is up to 82.46%, greatly improves phosphoric acid by wet process
And the economic benefit of fluosilicic acid iodine retracting device.
Description of the drawings
Fig. 1 is the connection relationship diagram of the utility model device.
1 relation structure diagram in Fig. 2 bitmaps 1.
Fig. 3 is in Fig. 12 relation structure diagram.
Fig. 4 is in Fig. 13 relation structure diagram.
1- iodine extraction cells 2- iodine reduction unit 3- iodine clean unit 4- pipe a 5- pipes b
Acid pump on 1.3 catalysis oxidation slot 1.4- blenders 1.5- of 1.1- phosphoric acid,diluteds and fluosilicic acid pipeline 1.2- dioxygens waterpipe
1.6- extraction tower 1.7- nozzle a 1.8- air blowers
2.1- dry air pipeline 2.2- molten sulfur pipeline 2.3- sulfur furnace 2.4- waste heat boiler 2.5- cooling pond 2.6- cold water
Tower 2.7- charging pump 2.8- heat exchanger 2.9- packed absorber 2.10- nozzle b 2.11- absorption cycle slot 2.12- circulating pumps
3.1- first class purification slot 3.2- blender c 3.3- calcium carbonate slot 3.4- secondary purification slot 3.5- blender d 3.6-
3.10 iodine filter 3.11- essence Iod R kettles of aluminum salt flocculant slot 3.7- oxidation analysis iodine slot 3.8- blender e 3.9- dioxygens sink
3.12- concentrated sulfuric acid groove 3.13- essence iodine separating tanks.
Specific embodiment
It is limited below in conjunction with the accompanying drawings with specific embodiment the technical solution of the utility model is further, but
Claimed range is not only limited to made description.
Embodiment
As shown in Figure 1, a kind of iodine retracting device using waste heat boiler exiting flue gas, is restored single by iodine extraction cells 1, iodine
Member 2, iodine clean unit 3 form；Iodine extraction cells 1 are connect by pipe a4 with iodine reduction unit 2；Iodine reduction unit 2 passes through pipe b5
It is connect with iodine clean unit 3.
Pipe a4 is that the iodine gas in iodine extraction cells 1 is sent into iodine reduction unit 2；Pipe b5 is will be in iodine reduction unit 2
Iodide ion solution be sent into iodine clean unit 3.
As shown in Figure 1 and Figure 2, in certain embodiments, the iodine extraction cells 1 include：Phosphoric acid,diluted and fluosilicic acid pipeline
1.1 enter catalysis oxidation slot 1.3 from top, and dioxygen waterpipe 1.2 enters catalysis oxidation slot 1.3, catalysis oxidation slot 1.3 from top
Interior blender a1.4, catalysis oxidation slot 1.3 are connect with upper acid pump 1.5, and upper acid pump 1.5 and nozzle a1.7 in extraction tower 1.6 connects
It connects, 1.6 top exit of extraction tower is connect with pipe a4, and air blower 1.8 is connect with 1.6 bottom inlet of extraction tower.
As shown in Figure 1, Figure 3, in certain embodiments, the iodine reduction unit 2 includes：Dry air pipeline 2.1 into
Enter sulfur furnace 2.3, molten sulfur pipeline 2.2 enters sulfur furnace 2.3, and sulfur furnace 2.3 is connect with waste heat boiler 2.4, waste heat boiler 2.4
Outlet is by pipeline through the pipeline between cooling pond 2.5,2.6 bonding pad absorption tower 2.9 of cooling tower, absorption cycle slot 2.11；
Pipe a4 is connect with 2.8 shell side inlet of heat exchanger, and 2.8 shell-side outlet of heat exchanger is connect with 2.9 bottom of packed absorber, heat exchanger
The outlet of 2.8 tube sides is connect with cooling tower 2.6, and cooling tower 2.6 is connect with cooling pond 2.5, and cooling pond 2.5 is connect with charging pump 2.7,
Charging pump 2.7 is connect with 2.8 tube-side inlet of heat exchanger；2.9 centrum bottom of packed absorber connects with 2.11 top of absorption cycle slot
It connects, absorption cycle slot 2.11 is connect with circulating pump 2.12, and circulating pump 2.12 passes through nozzle in threeway and packed absorber 2.9
B2.10, pipe b5 connections.
As Figure 1 and Figure 4, the iodine clean unit 3 includes in certain embodiments：Pipe b5 and first class purification slot
3.1 connections, calcium carbonate slot 3.3 are connect with first class purification slot 3.1, the blender c3.2 in first class purification slot 3.1, first class purification slot
3.1 bottoms are connect with 3.4 top of secondary purification slot, and aluminum salt flocculant slot 3.6 is connect with secondary purification slot 3.4, secondary purification slot
Blender d3.5 in 3.4,3.4 bottom of secondary purification slot are connect with 3.7 top of oxidation analysis iodine slot, dioxygen sink 3.9 and oxidation
Analysis iodine slot 3.7 connects, the blender e3.8 in oxidation analysis iodine slot 3.7, and 3.7 bottom of oxidation analysis iodine slot connects with iodine filter 3.10
It connects, iodine filter 3.10 is connect with smart Iod R kettle 3.11, and concentrated sulfuric acid groove 3.12 is connect with smart Iod R kettle 3.11, smart Iod R
3.11 outlet at bottom of kettle is connect with smart iodine separator 3.13.
In certain embodiments, preparing the method that iodine recycles reducing agent is：Dry air is with molten sulfur in 2.3 internal combustion of sulfur furnace
Generation sulfur dioxide is burnt, after waste heat boiler 2.4 recycles thermal energy, by pipeline by the cold of cooling pond 2.5 and cooling tower 2.6
But, into the pipeline between packed absorber 2.9 and absorption cycle slot 2.11, the solution flowed out from packed absorber 2.9 is inhaled
It receives.
In certain embodiments, it is using the iodine recovery method of waste heat boiler exiting flue gas：Phosphoric acid,diluted and silicate fluoride solution
Iodine molecule is obtained by the reaction with hydrogen peroxide, in extraction tower 1.6, air is inversely contacted with solution to be taken iodine molecule out of and enter heat exchanger
2.8,2.9 bottom of packed absorber is reached after cooling, is reacted with the circulation solution for absorbing sulfur dioxide, when iodine in solution
Ion concentration reaches 30-70g/L, into two-step purification slot defluorinate removing heavy-metal, is passed through hydrogen peroxide again and obtains iodine molecule, passes through
Filter, natural subsidence, refilters in concentrated sulfuric acid, obtains iodine product.
In certain embodiments, it is using the production process of the iodine of waste heat boiler exiting flue gas recycling：Dry air passes through
Dry air pipeline enters sulfur furnace, and the molten sulfur with entering sulfur furnace by molten sulfur pipeline is mixed and burned generation sulfur dioxide, into
Enter waste heat boiler recycling thermal energy, by pipeline by the cooling of cooling pond and cooling tower, into packed absorber and absorption cycle
Pipeline between slot, the solution flowed out from packed absorber absorb；Phosphoric acid,diluted and silicate fluoride solution pass through phosphoric acid,diluted and fluorine silicon
Acid tube road enters catalysis oxidation slot, is reacted with the hydrogen peroxide for entering catalysis oxidation slot by dioxygen waterpipe, and iodide ion is aoxidized
For iodine molecule, the nozzle a that the solution after reaction is pumped to by upper acid in extraction tower is sprayed in tower, air blower conveying air and tower
Interior solution is inversely contacted, and is taken out of after the iodine molecule in solution and is entered heat exchanger shell pass through pipe a；Cooling water in heat exchanger into
Enter cooling tower, flow into cooling pond naturally under the effect of gravity, then circulating cooling in heat exchanger tube pass is delivered to by charging pump；Iodine point
Sub- gas is after heat exchanger cools down, into packed absorber, be reduced into after being absorbed by the reducing agent solution that nozzle b is sprayed iodine from
Son flows into absorption cycle slot together, then enters by threeway nozzle b and pipeline b in packed absorber by circulating pump；Iodine from
Sub- solution enters first class purification slot, and solution enters back into secondary purification slot by the calcium carbonate defluorinate from calcium carbonate slot, with from
The aluminum salt flocculant of aluminum salt flocculant slot takes off lead, mercury, arsenic, enters back into oxidation analysis iodine slot, the hydrogen peroxide of dioxygen sink flows into oxygen
Change analysis iodine slot, the iodide ion in slot is again be oxidized as iodine molecule, after the filtering of iodine filter, into smart Iod R kettle,
Natural subsidence in the concentrated sulfuric acid from concentrated sulfuric acid groove finally by smart iodine separator filtering, obtains iodine product.
Claims (5)
1. a kind of iodine retracting device using waste heat boiler exiting flue gas, which is characterized in that restored by iodine extraction cells (1), iodine
Unit (2), iodine clean unit (3) composition；Iodine extraction cells (1) are connect by pipe a (4) with iodine reduction unit (2)；Iodine reduction is single
First (2) are connect by pipe b (5) with iodine clean unit (3).
A kind of 2. iodine retracting device using waste heat boiler exiting flue gas as described in claim 1, which is characterized in that pipe a (4)
It is that the iodine gas in iodine extraction cells (1) is sent into iodine reduction unit (2)；Pipe b (5) be by the iodine in iodine reduction unit (2) from
Sub- solution is sent into iodine clean unit (3).
A kind of 3. iodine retracting device using waste heat boiler exiting flue gas as claimed in claim 1 or 2, which is characterized in that institute
The iodine extraction cells (1) stated include：Phosphoric acid,diluted and fluosilicic acid pipeline (1.1) enter catalysis oxidation slot (1.3), hydrogen peroxide from top
Pipeline (1.2) enters catalysis oxidation slot (1.3) from top, the blender a (1.4) in catalysis oxidation slot (1.3), catalysis oxidation slot
(1.3) it is connect with upper acid pump (1.5), upper acid pump (1.5) nozzle a (1.7) interior with extraction tower (1.6) connect, extraction tower (1.6) top
Portion outlet is connect with pipe a (4), and air blower (1.8) is connect with extraction tower (1.6) bottom inlet.
A kind of 4. iodine retracting device using waste heat boiler exiting flue gas as claimed in claim 1 or 2, which is characterized in that institute
The iodine reduction unit (2) stated includes：Into sulfur furnace (2.3), molten sulfur pipeline (2.2), which enters, to be burnt on dry air Gu Na islands (2.1)
Sulphur stove (2.3), sulfur furnace (2.3) are connect with waste heat boiler (2.4), and waste heat boiler (2.4) outlet is by pipeline through cooling pond
(2.5), the pipeline between cooling tower (2.6) bonding pad absorption tower (2.9), absorption cycle slot (2.11)；Pipe a (4) and heat exchange
Device (2.8) shell side inlet connects, and heat exchanger (2.8) shell-side outlet is connect with packed absorber (2.9) bottom, heat exchanger (2.8)
Tube side outlet is connect with cooling tower (2.6), and cooling tower (2.6) is connect with cooling pond (2.5), cooling pond (2.5) and charging pump
(2.7) it connects, charging pump (2.7) is connect with heat exchanger (2.8) tube-side inlet；Packed absorber (2.9) centrum bottom is with absorbing
It is connected at the top of circulating slot (2.11), absorption cycle slot (2.11) is connect with circulating pump (2.12), and circulating pump (2.12) passes through threeway
Nozzle b (2.10) interior with packed absorber (2.9), pipe b (5) are connect.
A kind of 5. iodine retracting device using waste heat boiler exiting flue gas as claimed in claim 1 or 2, which is characterized in that institute
The iodine clean unit (3) stated includes：Pipe b (5) is connect with first class purification slot (3.1), calcium carbonate slot (3.3) and first class purification slot
(3.1) it connects, the blender c (3.2) in first class purification slot (3.1), first class purification slot (3.1) bottom and secondary purification slot
(3.4) top connects, and aluminum salt flocculant slot (3.6) is connect with secondary purification slot (3.4), the stirring in secondary purification slot (3.4)
It is connect at the top of device d (3.5), secondary purification slot (3.4) bottom and oxidation analysis iodine slot (3.7), dioxygen sink (3.9) and oxidation analysis iodine
Slot (3.7) connects, the blender e (3.8) in oxidation analysis iodine slot (3.7), oxidation analysis iodine slot (3.7) bottom and iodine filter
(3.10) it connects, iodine filter (3.10) is connect with smart Iod R kettle (3.11), concentrated sulfuric acid groove (3.12) and smart Iod R kettle
(3.11) it connects, smart Iod R kettle (3.11) outlet at bottom is connect with smart iodine separator (3.13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721530041.7U CN207524973U (en) | 2017-11-16 | 2017-11-16 | A kind of iodine retracting device using waste heat boiler exiting flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721530041.7U CN207524973U (en) | 2017-11-16 | 2017-11-16 | A kind of iodine retracting device using waste heat boiler exiting flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207524973U true CN207524973U (en) | 2018-06-22 |
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ID=62582181
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721530041.7U Expired - Fee Related CN207524973U (en) | 2017-11-16 | 2017-11-16 | A kind of iodine retracting device using waste heat boiler exiting flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207524973U (en) |
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2017
- 2017-11-16 CN CN201721530041.7U patent/CN207524973U/en not_active Expired - Fee Related
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Granted publication date: 20180622 Termination date: 20211116 |