CN106830605A - A kind of sludge combination treatment method and device - Google Patents
A kind of sludge combination treatment method and device Download PDFInfo
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- CN106830605A CN106830605A CN201710149847.XA CN201710149847A CN106830605A CN 106830605 A CN106830605 A CN 106830605A CN 201710149847 A CN201710149847 A CN 201710149847A CN 106830605 A CN106830605 A CN 106830605A
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- sludge
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- oily sludge
- coke
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- 239000010802 sludge Substances 0.000 title claims abstract description 193
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000011284 combination treatment Methods 0.000 title claims abstract description 19
- 238000011282 treatment Methods 0.000 claims abstract description 43
- 239000000571 coke Substances 0.000 claims abstract description 33
- 239000003921 oil Substances 0.000 claims abstract description 30
- 238000004939 coking Methods 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 14
- 230000003111 delayed effect Effects 0.000 claims abstract description 12
- 238000010025 steaming Methods 0.000 claims abstract description 9
- 230000018044 dehydration Effects 0.000 claims abstract description 8
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 7
- 239000000295 fuel oil Substances 0.000 claims abstract description 6
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 6
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract 3
- 230000008569 process Effects 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 8
- 238000005336 cracking Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 238000005188 flotation Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/365—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds from petrochemical industry (e.g. refineries)
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Activated Sludge Processes (AREA)
Abstract
The present invention relates to technical field of sludge treatment, more particularly to a kind of sludge combination treatment method and device, the sludge combination treatment method is comprised the following steps：Classification treatment is carried out to sludge, sludge is divided into oily sludge and activated sludge；Oily sludge steams out and/or the stage of steaming out greatly carries out harmless treatment by the way that delayed coking unit is small, moisture content in oily sludge and light oil are steamed and the recovery in coking plant using heat of high temperature in coke drum, contained heavy oil is cracked in coke drum, is condensed in activated sludge, and oil recovery and gas containing hydrocarbon in coking plant；Dehydration is dried to activated sludge.A kind of sludge combination treatment method and device that the present invention is provided, difference according to oil content is processed respectively, the outer discharge capacity of pollutant can be reduced, consumed energy is not needed not only, steam consumption is also reduced, energy-conservation is realized while emission reduction, reduce the operating cost of coking plant, and than traditional drying means, the treatment of solid condensate is more thorough.
Description
Technical field
The present invention relates to technical field of sludge treatment, more particularly to a kind of sludge combination treatment method and device.
Background technology
Petrochemical industry sludge is generally comprised three kinds (being commonly called as three mud)：Oil interceptor bed mud, flotation scum silica frost, residual active sludge,
These sludge composition is sufficiently complex, containing substantial amounts of harmful substance, because its property is special, dehydration and treatment technology difficulty it is big and
High cost.It is a kind of serious pollutant because its Residual oil, organic matter, content of beary metal are high, and as refinery's crude quality becomes
The increase of difference and quantity, three mud yield are increased considerably.
Outer committee is processed after three mud are carried out simple dehydration by major part refinery at present, and outer committee's treatment is per ton costly up to 1500-
3000 yuan, processing cost is high.It is relatively costly that existing three mud method for innocent treatment has, and some treatment effects are undesirable.Mesh
After preceding conventional processing method includes activated sludge through sludge drying, burned as coke, and oily sludge need to first pass through sump oil
Again by sludge drying after pretreatment.
Wherein, the processing method of oily sludge generally comprises following several ways：
Burning method：Pretreated oily sludge is concentrated by dehydration in advance, incinerator is delivered to and is burned, temperature should height
In 800-850 DEG C, the slag after burning need to be processed further.
Thermal desorption method：A kind of sludge high temperature processing method of remodeling, oily sludge is heated to a constant temperature under anoxic condition
Degree desorbs hydro carbons and organic matter.
Sludge organism reactor method：Be diluted in for oily sludge slimy container made in nutrient media by one kind,
Bioreactor makes hydrocarbons biodegradable by the artificially operating condition such as control oxygenation, temperature, nutriment.
Solvent extraction：Oily substance from sludge by solvent extraction out after, by distillation solvent from mixture
Separate recycling.
Wastewater Treatment Field in Refinery oil soil treatment technique：Greasy filth is carried out into thickening, then by adding a certain amount of flocculation
Agent improves its dewatering, then carries out mechanical dehydration.
As the cold burnt medium method of coking after profit extract and separate：Sump oil and greasy filth make after being heated up in slop tank oil,
Water and mud three phase separation carry out cutting water again, cut remaining sump oil and greasy filth after water and are settled through greasy filth pond, and bottom of pond residue greasy filth enters
Coking plant is delivered to after gravity concentration tank concentration, hot coke is cooled down before coke cleaning as quenching medium, separated in greasy filth
The water for going out can be used as coke cooling water or coke cutting water reuse.
But, in above-mentioned several process for treating oil-containing sludge, water-oil separating generally existing is separated not exclusively, after separation
Sludge oil content is high, and last handling process energy consumption and processing cost are high.Such as, burning method exist produce in burning process secondary pollution and
High energy consumption, it is high to there is processing cost in thermal desorption method, when there is investment cost higher or operation in other processing methods steam consumption quantity compared with
Big operating cost problem higher.
The content of the invention
It is an object of the invention to propose a kind of sludge combination treatment method and device, to solve present in prior art
In handling process generally existing treatment not thoroughly, the technical problem of the drawback such as energy consumption cost is high.
It is that, up to this purpose, the present invention uses following technical scheme：
A kind of sludge combination treatment method, comprises the following steps：
Classification treatment is carried out to sludge, sludge is divided into oily sludge and activated sludge；
Oily sludge steams out and/or the stage of steaming out greatly carries out harmless treatment by the way that delayed coking unit is small, using coke
By light oil in oily sludge and moisture evaporation, heavy oil carries out condensation cracking to heat in tower；
Dehydration is dried to activated sludge.
Further, the delayed coking unit is small steams out and/or the stage of steaming out greatly is entered by atomizer to oily sludge
Row atomization process, oily sludge part substitutes steam and is steamed out and/or the medium that steams out greatly as coke drum is small.
Further, profit is processed as moisture content in oily sludge using heat of high temperature in coke drum in the oily sludge
Steamed with light oil constituents, the heavy oil product in the oily sludge is partly cracked into light-end products and hydro carbons gas in coke drum
Body, partial condensates are coke, and contained solids enters in coke in the oily sludge, the ash content as coke.
Further, after oily sludge carries out harmless treatment, oils is converted into lightweight oils and hydrocarbonaceous in oily sludge
Gas is reclaimed, and remaining in coking containing solids in oily sludge warp is condensed in the coke that cracking is produced.
Further, the oily sludge includes oil interceptor bed mud and flotation scum silica frost.
Present invention also offers a kind of sludge combined treatment device, including disposal of oily sludge equipment and active sludge treatment
Equipment；The disposal of oily sludge equipment includes oily sludge tank, and the oily sludge tank is connected with oily sludge freshening pump, institute
State oily sludge freshening pump to be connected with the greasy filth import of atomizer, the atomizer is connected with steam pipe system by steam inlet,
The outlet connection coke drum of the atomizer；
The activity sludge treatmenting equipment includes activated sludge tank, and the activated sludge tank is connected by activated sludge delivery pump
Sludge drying machine is connected to, the sludge drying machine includes tail gas absorbing system.
Further, the disposal of oily sludge equipment includes that oily sludge stands system, the activated sludge plant bag
Include activated sludge and stand system, the oily sludge stands system and the activated sludge stands system and passes through conveying device respectively
It is connected with the oily sludge tank and the activated sludge tank.
A kind of sludge combination treatment method and device that the present invention is provided, when using, enter to oily sludge and activated sludge
Row classification process, by delayed coking unit it is small steam out and/or the coke drum in stage of steaming out greatly in heat treatment oily sludge,
Do not increase other energy during oily sludge is processed and save steam, remaining activated sludge is again through dense after minimizing treatment
Contracting and desiccation reach the target of recycling sludge.
The sludge combination treatment method and device, reach minimizing and process sludge reduction capital cost by treatment sludge of classifying
With and operating cost, disposal of oily sludge process do not increase operating cost and has energy-saving effect, sludge after treatment more thoroughly.
Brief description of the drawings
Fig. 1 is the FB(flow block) of the sludge combination treatment method that the embodiment of the present invention 1 is provided；
Fig. 2 is the disposal of oily sludge device structure block diagram of the sludge combined treatment device that the embodiment of the present invention 2 is provided；
Fig. 3 is the activity sludge treatmenting equipment structured flowchart of the sludge combined treatment device that the embodiment of the present invention 2 is provided.
In figure：
1st, oily sludge tank；2nd, oily sludge freshening pump；3rd, atomizer；4th, steam pipe system；5th, coke drum；6th, activated sludge
Tank；7th, activated sludge delivery pump；8th, sludge drying machine；9th, tail gas absorbing system.
Specific embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by specific embodiment.
Embodiment 1
As shown in figure 1, a kind of sludge combination treatment method, comprises the following steps：
Classification treatment is carried out to sludge, sludge is divided into oily sludge and activated sludge；Wherein, oily sludge includes oil removal
Bottom of pond mud and flotation scum silica frost；
Oily sludge steams out and/or the stage of steaming out greatly carries out harmless treatment by the way that delayed coking unit is small, using coke
By light oil in oily sludge and moisture evaporation, heavy oil carries out condensation cracking to heat in tower 5；
Delayed coking unit is small to steam out and/or the stage of steaming out greatly carries out atomization process by atomizer 3 to oily sludge, contains
Greasy dirt substitutes some vapor and is steamed out and/or the medium that steams out greatly as coke drum 5 is small.
Dehydration is dried to activated sludge.
Treatment in sludge (three mud) drying process to oil in sludge is more difficult, and three mud properties are changeable, and water-oil separating is more
It is difficulty.Sludge such as oil-containing enters drying system, has three unfavorable factors, and VOC may be produced first, secondly because of system
Need explosion-proof and increase construction costs, furthermore water-oil separating needs to add various chemical agents, increased construction investment and operation
Cost.
Therefore, oily sludge difficult to deal with conventional method is delivered to delayed coking unit and is processed by the present invention, real
Existing minimizing treatment.And oily sludge is processed by delayed coking unit, processing procedure will not only increase steam consumption quantity, also
Steam consumption during can reducing that coking plant is small and steaming out and/or steam out greatly, finally reduces the dirt of whole sludge drying
The overall investment and desiccation that mud amount also reduces Treatment of Sludge consume quantity of steam.Therefore, the combination technique of this Treatment of Sludge can be significantly
Reduce overall investment and operating cost.
Oily sludge and activated sludge can parallel processing, both distinguish in treatment process without priority.
Wherein, oily sludge is reclaimed after carrying out harmless treatment, in oily sludge contained solids through coking at
Staying in the coke that coking condensation cracking is produced after reason, because the overall productivity of coke is huge, a small amount of solids in sludge
The ash content of coke is not interfered with.
The sludge combination treatment method has the beneficial effect that：
Classification treatment and the final processing capacity of decrement treatment oily sludge, fully utilize delayed coking unit and containing greasy dirt
The characteristics of mud, steamed out and/or the processing cost of the phase process oily sludge that steams out greatly is relatively low using delayed coking unit is small, treatment
Effect is good, it is no longer necessary to enter the subsequent treatment such as sludge drying workshop section again, greatly save whole Treatment of Sludge operating cost and
Cost of investment.Compared with common sludge disposal technology, 100% can be accomplished in three-level model rate, in investment and operating cost
Upper more advantage, technological operation is simple, and easy to operate, investment and operating cost are reasonable.
Embodiment 2
As shown in Figures 2 and 3, a kind of sludge combined treatment device, including at disposal of oily sludge equipment and activated sludge
Reason equipment；Disposal of oily sludge equipment includes oily sludge tank 1, and oily sludge tank 1 is connected with oily sludge freshening pump 2, oil-containing
Sludge freshening pump 2 is connected with the greasy filth import of atomizer 3, and atomizer 3 is connected with steam pipe system 4, atomizer 3 by steam inlet
Outlet connection coke drum 5；
Activity sludge treatmenting equipment includes activated sludge tank 6, and activated sludge tank 6 is connected with by activated sludge delivery pump 7
Sludge drying machine 8, sludge drying machine 8 includes tail gas absorbing system 9.
Disposal of oily sludge equipment includes that oily sludge stands system, and activated sludge plant includes that activated sludge stands system
System, oily sludge stands system and activated sludge stands system respectively by conveying device and oily sludge tank 1 and activated sludge
Tank 6 is connected.
Three mud are carried out classification treatment by sludge combined treatment device sludge combination treatment method in conjunction with the embodiments in 1,
So as to realize more thoroughly treatment, and simple structure, easy to operate, energy consumption, low cost.
Know-why of the invention is described above in association with specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and can not by any way be construed to limiting the scope of the invention.Based on explanation herein, the technology of this area
Personnel associate other specific embodiments of the invention by would not require any inventive effort, these modes fall within
Within protection scope of the present invention.
Claims (7)
1. a kind of sludge combination treatment method, it is characterised in that comprise the following steps：
Classification treatment is carried out to sludge, sludge is divided into oily sludge and activated sludge；
Oily sludge steams out and/or the stage of steaming out greatly carries out harmless treatment by the way that delayed coking unit is small, using in coke drum
Light oil in oily sludge and moisture evaporation, heavy oil are carried out condensation cracking by heat；
Dehydration is dried to activated sludge.
2. sludge combination treatment method according to claim 1, it is characterised in that the delayed coking unit is small to steam out
And/or the big stage of steaming out carries out atomization process to oily sludge by atomizer, oily sludge part substitutes steam as coke
Tower is small to steam out and/or the medium that steams out greatly.
3. sludge combination treatment method according to claim 1, it is characterised in that profit is processed as in the oily sludge
Moisture content in oily sludge and light oil constituents are steamed using heat of high temperature in coke drum, the heavy oil product in the oily sludge exists
Light-end products and hydrocarbon gas are partly cracked into coke drum, partial condensates are coke, contained solid in the oily sludge
Thing enters in coke, the ash content as coke.
4. sludge combination treatment method according to claim 3, it is characterised in that oily sludge carries out harmless treatment
Afterwards, oils is converted into lightweight oils and gas containing hydrocarbon is reclaimed in oily sludge, and contained solids is remained in oily sludge
In the coke that coking condensation cracking is produced.
5. sludge combination treatment method according to claim 1, it is characterised in that the oily sludge includes oil interceptor bottom
Mud and flotation scum silica frost.
6. a kind of sludge combined treatment device, it is characterised in that including disposal of oily sludge equipment and activity sludge treatmenting equipment；
The disposal of oily sludge equipment includes oily sludge tank (1), and the oily sludge tank (1) is connected with oily sludge freshening pump
(2), the oily sludge freshening pump (2) is connected with the greasy filth import of atomizer (3), and the atomizer (3) is by steam inlet
Steam pipe system (4) is connected with, the outlet of the atomizer (3) connects coke drum (5)；
The activity sludge treatmenting equipment includes activated sludge tank (6), and the activated sludge tank (6) is by activated sludge delivery pump
(7) sludge drying machine (8) is connected with, the sludge drying machine (8) includes tail gas absorbing system (9).
7. sludge combined treatment device according to claim 6, it is characterised in that the disposal of oily sludge equipment includes
Oily sludge stands system, and the activated sludge plant includes that activated sludge stands system, the oily sludge stand system and
The activated sludge is stood system and is connected with the oily sludge tank (1) and the activated sludge tank (6) by conveying device respectively
Connect.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016108344105 | 2016-09-20 | ||
| CN201610834410.5A CN106277677A (en) | 2016-09-20 | 2016-09-20 | A kind of mud combination treatment method and device |
Publications (2)
| Publication Number | Publication Date |
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| CN106830605A true CN106830605A (en) | 2017-06-13 |
| CN106830605B CN106830605B (en) | 2023-05-30 |
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| CN201610834410.5A Pending CN106277677A (en) | 2016-09-20 | 2016-09-20 | A kind of mud combination treatment method and device |
| CN201710149847.XA Active CN106830605B (en) | 2016-09-20 | 2017-03-14 | Sludge combined treatment method and device |
| CN201720245383.8U Active CN206553370U (en) | 2016-09-20 | 2017-03-14 | A kind of sludge combined treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110407423A (en) * | 2019-07-24 | 2019-11-05 | 湖南省计量检测研究院 | A kind of resource utilization processing unit of oily sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108911456B (en) * | 2018-08-07 | 2021-11-05 | 李明泽 | Novel oily sludge treatment method and system |
| CN112607981B (en) * | 2020-12-10 | 2022-07-08 | 宁波中循环保科技有限公司 | Method and system for recycling waste mineral oil sludge |
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|---|---|---|---|---|
| CN110407423A (en) * | 2019-07-24 | 2019-11-05 | 湖南省计量检测研究院 | A kind of resource utilization processing unit of oily sludge |
| CN110407423B (en) * | 2019-07-24 | 2020-06-23 | 湖南省计量检测研究院 | Resource recovery processing device for oily sludge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106277677A (en) | 2017-01-04 |
| CN206553370U (en) | 2017-10-13 |
| CN106830605B (en) | 2023-05-30 |
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Denomination of invention: A sludge combination treatment method and device Effective date of registration: 20231124 Granted publication date: 20230530 Pledgee: Bank of Shanghai Limited by Share Ltd. Pudong branch Pledgor: SHANGHAI YOUHUA SYSTEM INTEGRATION TECHNOLOGY Co.,Ltd. Registration number: Y2023310000773 |