CN215138604U - Equipment for deacidifying, removing dioxin and heavy metals from dry powder returned material of waste incineration plant - Google Patents
Equipment for deacidifying, removing dioxin and heavy metals from dry powder returned material of waste incineration plant Download PDFInfo
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- CN215138604U CN215138604U CN202023075761.3U CN202023075761U CN215138604U CN 215138604 U CN215138604 U CN 215138604U CN 202023075761 U CN202023075761 U CN 202023075761U CN 215138604 U CN215138604 U CN 215138604U
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- slaked lime
- reactor
- activated carbon
- dry powder
- bin
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- 239000000843 powder Substances 0.000 title claims abstract description 27
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 14
- 238000004056 waste incineration Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 title claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 122
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 93
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 89
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 89
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 89
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003546 flue gas Substances 0.000 claims abstract description 26
- 238000005303 weighing Methods 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 239000000428 dust Substances 0.000 claims description 31
- 238000005507 spraying Methods 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 11
- 239000003344 environmental pollutant Substances 0.000 abstract description 8
- 231100000719 pollutant Toxicity 0.000 abstract description 8
- 239000007921 spray Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract 1
- 239000010881 fly ash Substances 0.000 description 17
- 239000002956 ash Substances 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 239000010813 municipal solid waste Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010517 secondary reaction Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model discloses a deacidification of waste incineration plant dry powder returning charge, remove dioxin and heavy metal equipment. The utility model discloses deacidification of waste incineration plant dry powder returning charge, remove dioxin and heavy metal equipment comprise 4 parts, are medicament storage facilities respectively: slaked lime warehouse, active carbon warehouse, medicament measurement weighing apparatus: weighing hopper, frequency conversion ejection of compact spiral, injection fan, injection accelerator, slaked lime reactor: u type reactor, spray nozzle, guide plate, dry powder returning charge equipment: scraper conveyors, sump pumps. The process configuration and the conveying mode of the slaked lime dry powder and the activated carbon are basically the same. The utility model discloses a flow optimization of reactor to and the process design of returning charge, reduced the use amount of slaked lime and active carbon, increased the dwell time of medicament, improved the clearance of pollutant, the peak value that flue gas pollutant concentration appears suddenly can be eliminated to a large amount of returning charges simultaneously, is applicable to the constantly changing burning operating mode of msw incineration factory, has reduced the environmental protection risk.
Description
Technical Field
The utility model relates to a deacidification of dry powder returning charge of msw incineration plant, remove dioxin and heavy metal equipment.
Background
The garbage incineration can realize the reduction, harmlessness and reclamation of the garbage to the maximum extent, but the smoke generated by the garbage incineration contains a large amount of substances harmful to the environment, wherein HCl and SO2The emission of dioxin is an important index for environmental monitoring, along with the massive establishment of domestic waste incineration power plants, the emission of dioxin is limited by the requirement of the total emission amount of pollutants, and in many areasHCl、SO2The emission concentration requirement is increased to 20mg/Nm3In the following, the emission requirements of dioxin are more and more strict, slaked lime and activated carbon are difficult to meet the environmental protection requirements by directly spraying the slaked lime and the activated carbon into the front flue of the dust remover, and the semi-dry process and the wet process can meet the environmental protection requirements, but the investment and the operation cost are high. The dry powder returning process improves the reaction efficiency to the maximum extent under the condition of ensuring the economy and can meet the higher pollutant discharge requirement.
The common dry powder injection system directly injects the slaked lime and the activated carbon into a horizontal flue in front of the dust remover, so that the medicament cannot be uniformly mixed with the flue gas to achieve sufficient reaction, and cannot cope with the instant increase of the concentration of pollutants caused by the change of the incineration working condition. The system equipment forms a material bed at the outlet of the reactor through the material returning device, so that the retention time of the medicament in the flue gas is increased, a large amount of material returning can make up the problem of control lag, and the problem of pollutant peak value is eliminated.
On the project of slaked lime and activated carbon injection, a large amount of slaked lime, activated carbon and reaction products of the slaked lime and the activated carbon are captured on the surface of a filter bag of the bag type dust collector, and unreacted medicaments are directly collected and treated to become fly ash and pollute the environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at further optimizing deacidification equipment under the more and more strict condition of present msw incineration fume emission index, improve HCl desorption rate to 90% by 75%, with SO2The removal rate is improved from 65 percent to 85 percent.
The utility model discloses a realize through following technical scheme:
a device for deacidifying, removing dioxin and heavy metals from dry powder return materials of a waste incineration plant comprises a slaked lime storage bin, an active carbon storage bin, a bin top dust remover, a metering and feeding device, a Roots blower, an injection accelerator, a slaked lime reactor and a bin pump;
the slaked lime storage bin is used for storing slaked lime dry powder and is provided with a bin top dust remover, a bin wall vibrator, a fluidized air device and a related material level meter;
the activated carbon storage bin is used for storing activated carbon and is provided with a bin top dust remover, a bin wall vibrator, a fluidized air device, a nitrogen inerting device and a related material level meter;
the metering and feeding device is used for receiving slaked lime and activated carbon from a slaked lime storage bin and an activated carbon storage bin, delivering the slaked lime and the activated carbon after weighing and metering, and consists of a star-shaped ash discharge valve, a screw feeder, a weightlessness scale and a related control cabinet;
the spraying device is used for spraying the slaked lime dry powder and the activated carbon from the metering and feeding device to enter the slaked lime reactor and consists of a Roots blower, a spraying accelerator, relevant instruments and valves;
the slaked lime reactor is used for performing neutralization reaction of deacidification and dioxin adsorption reaction and consists of a reactor body, a nozzle, a scraper conveyor, a bin pump, related instruments and valves;
the system control unit comprises a PLC control cabinet, an MCC power distribution cabinet and an on-site control box, receives HCl and SO2 concentration signals from the front and the back of the reactor, adjusts the spraying amount of slaked lime by using a closed-loop automatic control mode, ensures that the emission concentration of acid gas meets the environmental protection requirement, and simultaneously adsorbs dioxin and heavy metals in flue gas.
Furthermore, when the slaked lime and the activated carbon are sprayed, the dry powder collected on the dust remover at the downstream of the reactor is sent into the reactor again for secondary reaction in a pneumatic conveying mode.
Furthermore, the spraying amount of the slaked lime is controlled by HCl and SO2 concentration signals before and after the reactor, and the return amount of the dry powder is controlled by the pressure difference signals of the inlet and the outlet of the reactor.
Furthermore, the utilization rate of slaked lime and activated carbon agents is maximized, and agents which do not completely react in the dust remover are reused.
Furthermore, the consumption of the medicament is reduced, the wave peak value of acid gas emission is eliminated, the pressure drop is small, and no energy loss exists.
The utility model discloses deacidification of waste incineration plant dry powder returning charge, remove dioxin and heavy metal equipment comprise 4 parts, are medicament storage facilities respectively: slaked lime warehouse, active carbon warehouse, medicament measurement weighing apparatus: weighing hopper, frequency conversion ejection of compact spiral, injection fan, injection accelerator, slaked lime reactor: u type reactor, spray nozzle, guide plate, dry powder returning charge equipment: scraper conveyors, sump pumps. The process configuration and the conveying mode of the slaked lime dry powder and the activated carbon are basically the same.
The beneficial effects of the utility model
1. The HCl removal efficiency of the waste incineration plant is improved from 75% to 90%;
2. SO from refuse incineration plants2The removal efficiency is improved from 65% to 85%;
3. the consumption of slaked lime of each ton of garbage is reduced from 14kg to 10kg, and the consumption of active carbon is reduced from 0.5kg to 0.3 kg;
4. elimination of HCl and SO2The emission peak of (c);
5. water is not sprayed in the flue gas, so that the flue gas waste heat utilization potential is large;
6. the system pressure loss is low.
Drawings
FIG. 1, a slaked lime reactor for slaked lime and activated carbon injection and return;
FIG. 2 shows the technological process of deacidification, dioxin removal and heavy metal removal of dry powder return materials in a waste incineration plant.
Detailed Description
The working principle of the present invention is further explained with reference to the attached drawings as follows:
as shown in fig. 2, a process flow diagram of deacidification, dioxin removal and heavy metal removal of dry powder return materials in a waste incineration plant is shown, and the process equipment mainly comprises: 1 slaked lime storage; 2 slaked lime weighing hopper; 3, a Roots blower; 4, storing the activated carbon in a bin; 5, an active carbon weighing hopper; 6, activated carbon injection equipment; 7U type reactor; 8, a scraper conveyor; 9-chamber pump.
Slaked lime injection path: firstly feeding slaked lime in a slaked lime storage bin 1 to a slaked lime weighing hopper 2 through a bin bottom ash discharge valve, stopping feeding of the weighing hopper when the material level in the weighing hopper reaches a high material level, weighing the slaked lime in the weighing hopper in real time through a weighing sensor, and controlling the discharge amount by matching with a variable frequency screw at the outlet of the weighing hopper, wherein the discharge amount and the HCl and SO at the inlet and the outlet of a U-shaped reactor 7 are controlled by matching with the variable frequency screw2The values of the lime hydrate are interlocked, so that the spraying amount of the slaked lime is controlled while the acid gas is discharged. The measured slaked lime falls into the injection pipeline through the Venturi tube and is blown into the upstream flue of the U-shaped reactor 7 by the Roots blower 3 at fixed pressure and air quantity.
Activated carbon spray path: at first, the active carbon in the active carbon storage bin 4 is fed to the active carbon weighing hopper 5 through the ash discharge valve at the bottom of the bin, when the material level in the weighing hopper reaches a high material level, the weighing hopper stops feeding, the active carbon in the weighing hopper is weighed in real time through the weighing sensor, the frequency conversion spiral control discharge amount of the outlet of the weighing hopper is matched, the discharge amount is interlocked with the inlet flue gas flow of the U-shaped reactor 7, and the simultaneous control active carbon spraying amount for dioxin discharge is ensured. The measured active carbon falls into the injection pipeline through the Venturi tube and is blown into an upstream flue of the U-shaped reactor 7 by the Roots blower 3 at fixed pressure and air volume.
A material returning path: the slaked lime and the activated carbon pass through the U-shaped reactor 7 and are captured by a filter bag of the bag type dust collector, the slaked lime, the activated carbon and the fly ash entering an ash hopper of the dust collector enter a scraper conveyor 8 below the dust collector through an ash discharge valve, the slaked lime, the activated carbon and the fly ash are conveyed to a bin pump 9 below the scraper conveyor by the scraper conveyor 8 in a mechanical conveying mode, the bin pump 9 is also provided with a material level switch, when the feeding reaches a high material level, the bin pump 9 stops feeding, and the slaked lime, the activated carbon and the fly ash are conveyed into an outlet flue of the U-shaped reactor 7 in a positive pressure conveying mode. Route in U-shaped reactor 7: the agent from the slaked lime storage bin and the active carbon storage bin passes through a U-shaped flue in the reactor, and a guide plate is arranged in the flue to help the flue gas and the agent to be uniformly mixed and prolong the retention time of the agent in the flue.
The reactor apparatus of the present invention will be further described with reference to the accompanying drawings:
as shown in fig. 1, the slaked lime reactor is a section of U-shaped flue, a flow guide plate 10 is arranged at the U-shaped corner of the bottom of the flue, and a water drop-shaped flow guide structure 11 is designed in the middle for optimizing the internal flue gas flow field. The raw flue gas enters from the inlet of the reactor, the slaked lime and the activated carbon are sprayed into a raw flue gas channel of the reactor through the activated carbon injection inlet 12 and the slaked lime injection inlet 13 in a pneumatic conveying mode, after the mixture is mixed with the flue gas at the channel inlet, the activated carbon and the slaked lime are guided to a U-shaped guide plate at the bottom of the reactor along with the flue gas under the action of a water drop structure, and the guide plate rectifies the flue gas, so that the activated carbon and the slaked lime can be uniformly contacted with the flue gas, and meanwhile, the retention time and the mixing effect are increased. The U-shaped channel outlet is provided with a return port 18, slaked lime, activated carbon and fly ash from the return of the bag-type dust collector are sprayed in by pressurizing through a bin pump, and the material quantity of the return is controlled by the system, so that the outlet of the reactor forms a fluidized bed layer 17, the contact chance of unreacted reagents and flue gas is increased, the reaction efficiency is improved, and the slaked lime and the activated carbon reagents are saved. The channel size of the reactor is proportional to the actual flue gas quantity, and the raw flue gas channel 14 and the clean flue gas channel 15 of the reactor are distinguished by a partition plate 16.
The process flow is illustrated below by taking slaked lime as an example: the slaked lime dry powder stored in the slaked lime bin is discharged into a weighing hopper through a star-shaped lime discharge valve at the bottom of the bin, the slaked lime after weighing and metering is continuously sent out under the action of a variable frequency screw, and is sprayed into an upstream flue of the U-shaped reactor under the positive pressure air supply of a spraying fan. After mixing and reacting the slaked lime in the reactor, the slaked lime enters the bag-type dust collector along with the flue, the slaked lime after the reaction is captured on the filtering surface of the dust collector, the slaked lime enters the ash bucket of the dust collector along with the ash removal of the bag-type dust collector, the fly ash, the slaked lime and the activated carbon of the ash bucket are sent into a bin pump at the downstream of the scraper conveyor by a scraper conveyor of the dust collector, the fly ash, the slaked lime and the activated carbon are sent into the flue at the outlet of the U-shaped reactor by the bin pump in a pneumatic conveying mode, a material layer of the fly ash, the slaked lime and the activated carbon is formed at the outlet of the reactor, and the third reaction is carried out upwards along with the flue gas. Finally, the fly ash enters the bag type dust collector again, is collected by the filter bag and then is sent into a fly ash storage bin through a scraper conveyor and other parallel bin pumps.
The utility model relates to a deacidification of dry powder returning charge of msw incineration plant, remove dioxin and heavy metal equipment, its control principle as follows:
injection closed-loop control principle:
slaked lime injection: HCl and SO are respectively arranged at the inlet of the U-shaped reactor and the inlet of the bag type dust collector2The acid gas detection device calculates the required lime hydrate injection amount through the concentration change of the acid gas before and after the acid gas detection device, the injection amount gives out a control signal through the PLC control cabinet, the weighing and feeding device is controlled to give out the required lime hydrate amount, and the lime hydrate amount is pressurized by the fan and then is sent into a flue in front of the reactor.
Activated carbon injection: a flue gas flow detection device is arranged at an inlet of the U-shaped reactor or an inlet of the bag type dust collector, a control signal is given out through a PLC (programmable logic controller) control cabinet according to the amount of 50mg of activated carbon sprayed by each cubic flue gas, the required amount of the activated carbon is given out by controlling the weighing and feeding device, and the activated carbon is pressurized by a fan and then is fed into a flue in front of the reactor.
Dust remover deashing closed-loop control principle:
the bag-type ash removal is controlled according to the pressure drop of the dust remover, generally set at 1200-1500 pa, and when the pressure drop of the dust remover reaches a set value, compressed air is blown to blow slaked lime, activated carbon and fly ash into the ash bucket.
A material returning closed-loop control principle:
the fly ash, the slaked lime and the activated carbon falling into the ash bucket are uninterruptedly discharged to a scraper conveyor below the dust remover through an ash discharge valve, the fly ash, the slaked lime and the activated carbon are conveyed into a downstream bin pump by the scraper conveyor, and are pneumatically conveyed to a flue at the outlet of the reactor by the bin pump. The fly ash, the slaked lime and the activated carbon which fall into the ash bucket cannot be completely returned, the material returning frequency and the material returning quantity are controlled according to the pressure difference of the inlet and the outlet of the U-shaped reactor, the material returning is stopped after a set pressure difference value is reached, and the rest fly ash, the slaked lime and the activated carbon are sent to a bin pump which is additionally arranged, so that the bin pump pumps the fly ash to a special storage bin for the fly ash.
The utility model discloses a deacidification of waste incineration plant dry powder returning charge, remove dioxin and heavy metal equipment. The equipment is used for spraying the slaked lime dry powder and the activated carbon in the reactor, and the reaction efficiency of the medicament is improved through the flow field design of the reactor and the material returning device. The slaked lime and the active carbon are respectively stored in respective storage bins, the required medicament amount is continuously measured in a weightless weighing measuring mode, and is injected into an upstream flue of the reactor through a Roots blower under positive pressure. The reactor is a U-shaped flue, the slaked lime and the activated carbon are sprayed in the upstream flue of the reactor through a nozzle, the slaked lime and the activated carbon are fully mixed with the flue gas in the U-shaped reactor after being sprayed in and then enter the dust remover, and flow guide plates are arranged in the reactor and the flue at the inlet of the dust remover to rectify the flue gas, so that the slaked lime and the activated carbon can be uniformly adsorbed on the surface of the bag type dust remover to carry out secondary reaction. Because the reaction of the dry powder of the slaked lime and the acid gas in the flue gas is influenced by the surface area of the medicament and the retention time in the reactor, and partial slaked lime is still in an unreacted or incompletely reacted state, the slaked lime and the activated carbon collected by the bag-type dust collector are collected and conveyed to the outlet of the reactor through a bin pump under positive pressure, a material bed is formed at the outlet of the reactor, and the medicament is subjected to a third reaction in a flue at the outlet of the reactor. The system optimizes the process of the reactor and reduces the use amount of slaked lime and active carbon through the process design of the return materials, increases the retention time of the medicament, improves the removal rate of pollutants, can eliminate the peak value of the concentration of the smoke pollutants suddenly due to a large amount of return materials, is suitable for the constantly changing combustion working condition of a waste incineration plant, and reduces the environmental risk.
Claims (1)
1. A device for deacidifying and removing dioxin and heavy metals from dry powder return materials in a waste incineration plant is characterized by comprising a slaked lime storage bin, an activated carbon storage bin, a bin top dust remover, a metering and feeding device, a Roots blower, an injection accelerator, a slaked lime reactor and a bin pump;
the slaked lime storage bin is used for storing slaked lime dry powder and is provided with a bin top dust remover, a bin wall vibrator, a fluidized air device and a material level meter;
the activated carbon storage bin is used for storing activated carbon and is provided with a bin top dust remover, a bin wall vibrator, a fluidized air device, a nitrogen inerting device and a material level meter;
the metering and feeding device is used for receiving slaked lime and activated carbon from a slaked lime storage bin and an activated carbon storage bin, sending out the slaked lime and the activated carbon after weighing and metering, and consists of a star-shaped ash discharge valve, a screw feeder, a weightless scale and a control cabinet;
the injection accelerator is used for injecting slaked lime dry powder and active carbon from the metering feeding device into the slaked lime reactor and consists of a Roots blower, the injection accelerator, an instrument and a valve;
the slaked lime reactor is used for performing neutralization reaction of deacidification and dioxin adsorption reaction and consists of a reactor body, a nozzle, a scraper conveyor, a bin pump, an instrument and a valve;
the system control unit consists of a PLC control cabinet, an MCC power distribution cabinet and a local control box and receives HCl and SO from the front and the back of the slaked lime reactor2And the concentration signal adjusts the spraying amount of the slaked lime in a closed-loop automatic control mode, ensures that the emission concentration of the acid gas meets the environmental protection requirement, and simultaneously adsorbs dioxin and heavy metals in the flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023075761.3U CN215138604U (en) | 2020-12-19 | 2020-12-19 | Equipment for deacidifying, removing dioxin and heavy metals from dry powder returned material of waste incineration plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023075761.3U CN215138604U (en) | 2020-12-19 | 2020-12-19 | Equipment for deacidifying, removing dioxin and heavy metals from dry powder returned material of waste incineration plant |
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| Publication Number | Publication Date |
|---|---|
| CN215138604U true CN215138604U (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023075761.3U Expired - Fee Related CN215138604U (en) | 2020-12-19 | 2020-12-19 | Equipment for deacidifying, removing dioxin and heavy metals from dry powder returned material of waste incineration plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215138604U (en) |
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2020
- 2020-12-19 CN CN202023075761.3U patent/CN215138604U/en not_active Expired - Fee Related
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