CN210186721U - Movable hazardous waste disposal system - Google Patents
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- CN210186721U CN210186721U CN201920448813.5U CN201920448813U CN210186721U CN 210186721 U CN210186721 U CN 210186721U CN 201920448813 U CN201920448813 U CN 201920448813U CN 210186721 U CN210186721 U CN 210186721U
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Abstract
The movable dangerous waste disposal system can be moved to other waste production units for disposal after disposal of one unit is finished, and at least one problem of the existing plasma waste disposal system can be avoided. The movable hazardous waste disposal system comprises a plasma gasification melting furnace, a water washing tower and a dust removal device, wherein the water washing tower is used for cooling, deacidifying and removing dust of gas discharged by the plasma gasification melting furnace; and the exhaust device is used for treating the gas exhausted by the dust removal device.
Description
Technical Field
The utility model relates to a waste disposal system and disposal technology.
Background
The treatment of hazardous waste is a major challenge facing all countries in the world, and although the volume of the waste can be reduced by the traditional incineration equipment, the generated dioxin is always a concern. The thermal plasma can pyrolyze toxic solid waste to generate glass substances and synthetic gas without combustion, so that not only is the garbage decomposed, but also the pollutants are prevented from being generated. These glass substances can be used as building materials and synthesis gas as clean fuel. Aiming at the solid waste treatment by the thermal plasma, a great deal of research work has been done by various domestic and foreign research units, but at the present stage, the domestic plasma technology is still in the primary stage.
The plasma harmless treatment system and method for the dangerous solid wastes of the Chinese patent application with publication number CN108518693A and publication date 2018, 9, 11, wherein the treatment system comprises a material feeding system, a plasma gasification melting furnace, a reforming combustion chamber, a heat exchange system, a flue gas treatment system and an exhaust system, and the feeding system is used for feeding the dangerous solid wastes to the plasma gasification melting furnace; the plasma gasification melting furnace is provided with a plasma torch and is used for melting and gasifying the dangerous solid wastes to obtain molten slag and smoke; the reforming combustion chamber is provided with a plasma torch for treating the flue gas to obtain reformed flue gas; the heat exchange system is used for exchanging the heat of the reformed flue gas to the circulating water system and obtaining cooled flue gas at the same time; the flue gas treatment system is used for purifying and cooling flue gas to obtain purified air; the exhaust system is used to exhaust the purified air.
However, the inventors have realized in practice that there is currently a great need for on-site disposal of hazardous waste from many small to medium waste units due to the increasing standards for environmental protection. If the requirement is met, the environmental protection cost can be greatly reduced, and meanwhile, the phenomenon of stealing, arranging and falling down is better avoided. The existing plasma waste treatment system is a fixed device, a disposal unit needs to transport hazardous waste generated by a waste production unit to a disposal center in a centralized manner so as to dispose the hazardous waste in the centralized manner, and for a waste production unit far away from the disposal center, the disposal manner is undoubtedly that the transportation cost is increased to increase the disposal cost of the hazardous waste, and especially for a unit with less waste production, the disposal manner is lack of flexibility.
In addition, the synthesis gas at the outlet of the plasma furnace in the existing plasma waste treatment system is directly burned out in the secondary combustion chamber, and due to the use of air (excessive oxygen) and high temperature >1200 ℃ in the burning-out process, thermodynamic NOx is inevitably generated in the process, so that the subsequent denitration burden is increased. In the subsequent flue gas purification process, because the flue gas is cooled by using water or alkali liquor in the quenching and semi-drying process, the temperature of the flue gas is reduced from 500 ℃ to below 200 ℃ within 1s, the process has extremely high control requirements, the temperature of the flue gas is reduced at extremely high speed, the tower body corrosion caused by the 'wet wall' caused by excessive water injection cannot be caused, and small-particle atomized alkali liquor used in the quenching process is generated by a high-quality atomizing nozzle under high pressure, and the atomizing nozzle is inevitably blocked due to mechanical friction or scaling in the using process, so that frequent maintenance and replacement are needed. In addition, in the process route, alkali adopted by the quenching semi-dry method and the quenching dry method and salt generated after acid-alkali neutralization enter the bag-type dust remover in the form of particles, and the disposal load of the bag-type dust remover is increased by artificially increasing the concentration of the particles in the flue gas. Most of the volatile heavy metals in the flue gas are still in the secondary fly ash discharged by the bag-type dust collector, and the fly ash needs to be further treated. And because most of the cloth bags at the present stage contain PTFE materials, the cloth bags also need to be incinerated for disposal after being used for 2-3 years, and F (fluorine) element is released in the disposal process, so the difficulty of flue gas purification and the corrosion prevention requirement of the system are increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a movable hazardous waste handles system, it is portable device, can remove to other units of producing waste after a unit is handled and is dealt with, can avoid having at least one problem that plasma waste processing system exists.
Another object of the utility model is to provide a movable hazardous waste treatment process, it can be in a flexible way produce useless unit and carry out the useless processing of danger.
A first aspect provides a mobile hazardous waste disposal system comprising a plasma gasification melting furnace, further comprising:
a water washing tower for cooling, deacidifying and dedusting the gas exhausted from the plasma gasification melting furnace;
the dust removal device is used for further removing dust from the gas discharged from the water washing tower; and
and the exhaust device is used for treating the gas discharged by the dust removal device.
In one or more embodiments of the system, the water wash column comprises a two-stage water wash column.
In one or more embodiments of the system, the first stage of the two-stage water scrubber is configured to spray dilute alkali solution to the inlet gas at a liquid-gas ratio of 3-10L/m3The second stage water washing tower is configured to spray dilute alkali liquor and the liquid-gas ratio of the inlet gas is 1-8L/m3。
In one or more embodiments of the system, each of the water washing towers is a venturi wet quenching deacidification tower, the bottoms of the two water washing towers are communicated, an adjusting device for adjusting the PH value of the dilute alkali liquor is arranged at the bottom of the tower, and a circulating pump is arranged to recycle the dilute alkali liquor at the bottom of the tower to spray gas.
In one or more embodiments of the system, the dust removal device is a wet electrostatic precipitator.
In one or more embodiments of the system, the exhaust apparatus includes a flare and/or a gas drying tower that dries the exhaust gas, a pressurized gas engine that dries and pressurizes the exhaust gas, and a gas holder that receives the pressurized exhaust gas.
In one or more embodiments of the system, the system further comprises a filter press that receives the precipitate from the bottom of the water wash column or/and the dust separator.
The second scheme is to provide a movable hazardous waste disposal process, which conveys the crushed waste to a plasma gasification melting furnace for treatment, and further comprises the following steps:
the gas discharged by the plasma gasification melting furnace of the water scrubber is used for cooling, deacidifying and dedusting, and the temperature of the gas is reduced to be below 100 ℃;
further dedusting the cooled gas by using a dedusting device;
and (4) discharging the dedusted gas.
In one or more embodiments of the treatment process, the gas generated in the plasma gasification melting furnace stays in the plasma gasification melting furnace for more than 3 seconds, the temperature reduction, deacidification and dust removal are carried out by using dilute alkali liquor in a two-stage water washing tower, and the liquid-gas ratio in a first-stage water washing tower is 3-10L/m3The temperature of the synthesis gas is reduced to be below 100 ℃, deacidification and dust removal are completed in the process, and dioxin in the synthesis gas is prevented from being regenerated and then enters a second-stage water washing tower; further deacidifying and dedusting the synthesis gas by using dilute alkali liquor in a second-stage water washing tower, wherein the liquid-gas ratio is 1.5-8L/m3The two-stage washing tower is communicated with the bottom of the tower, and the pH value of the circulating liquid of the dilute alkali liquor is adjusted to be between 8 and 11.5 at the bottom of the tower.
In one or more embodiments of the treatment process, the cooled gas is further subjected to dust removal and dehumidification by a wet electrostatic precipitator.
According to the system or the method of the utility model, the generation of NOx can be reduced to the utmost extent, and volatile heavy metals can be collected while the synthesis gas is efficiently deacidified and dedusted, so that the enrichment of the volatile heavy metals is facilitated, and the recovery of the heavy metals is possible; in some embodiments, the system does not need a cloth bag, thereby well avoiding the defect of secondary fly ash generation in the similar flue gas dust removal process and reducing secondary pollution. In some embodiments, the syngas is cooled directly with large amounts of water during the quench process, the syngas temperature is reduced to below 100 ℃, the use of multi-fluid atomizing nozzles is avoided, the syngas purification system is easier to control, and the system maintenance costs are reduced.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
fig. 1 is a flow diagram of a mobile hazardous waste disposal process according to one or more embodiments.
FIG. 2 is a schematic diagram of the overall configuration of one or more embodiments of a venturi scrubber.
Fig. 3 is a schematic plan view of the flow guide structure in fig. 2.
Fig. 4 is a schematic view showing a state in which the diffuser pipe in fig. 3 forms a flow guide.
Detailed Description
The following discloses many different embodiments or examples for implementing the subject technology described. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and are not intended to limit the scope of the present invention. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.
Fig. 1 is a flow diagram of a mobile hazardous waste disposal process of an apparatus according to one or more embodiments, while also from fig. 1, it can be understood that the mobile hazardous waste disposal system of one or more embodiments includes a crusher 1, a feeder 2, a plasma gasification melting furnace 3, a two-stage water washing tower 4, a wet electrostatic precipitator 5, a gas drying tower 6, a booster gas machine 7, a gas holder 8, a flare 9, a filter press 10. In one or more embodiments, the mobile hazardous waste disposal system is further provided with a vehicle-mounted platform, the vehicle-mounted platform is provided with the components, and after disposal of one unit is completed, the mobile hazardous waste disposal system can be moved to other waste production units for disposal.
One embodiment of the crusher 1 is a 4-shaft crusher, crushing the hazardous material to a certain size, for example to a size below 100 mm.
One embodiment of the feeder 2 is a screw feeder or a hydraulic pusher, which delivers the crushed hazardous waste to the plasma gasification melting furnace 3. A feeder 2 is arranged at the outlet of the crusher 1. The feed inlet of the plasma gasification melting furnace 3 is arranged at the discharge outlet of the feeder 2.
The plasma gasification melting furnace 3 gasifies and melts the dangerous waste to generate vitrified slag and synthetic gas, and the main components of the synthetic gas are CO and H2、CH4And discharging the vitrified slag from the bottom of the furnace body in a molten state. The plasma gasification melting furnace 3 mainly includes a furnace body and a plurality of thermal plasma torches provided in the furnace body.
The two-stage water washing tower 4 comprises a first-stage water washing tower and a second-stage water washing tower, wherein the air inlet of the first-stage water washing tower is connected with the air outlet of the plasma gasification melting furnace 3 through a pipeline, one embodiment of the first-stage water washing tower and the second-stage water washing tower is a Venturi wet quenching deacidification tower, and the first-stage water washing tower and the second-stage water washing tower are a Venturi wet quenching deacidification towerThe stage water washing tower is configured to have a liquid-gas ratio of 3-10L/m3Preferably in the range of 4.5-5L/m3And the washing liquid is dilute alkali liquid. The gas inlet of the second-stage water washing tower is communicated with the gas outlet of the first-stage water washing tower, the tower bottoms of the two-stage water washing towers are communicated, circulating liquid of dilute alkali liquor is shared, an adjusting device is arranged at the tower bottom, the pH value of the circulating liquid is kept between 8 and 11.5, and the circulating liquid is conveyed to a spraying device through a circulating pump to wash gas.
A schematic structure of the venturi wet quenching deacidification tower is shown in fig. 2 to 4, and comprises an inlet pipe 41, a contraction pipe 42, a throat pipe 48 and a diffusion pipe 43 which are sequentially communicated, wherein an adjuster penetrates through the inlet pipe 41 and can penetrate through the throat pipe 48 to spray water in an up-and-down adjusting mode, a flow guide structure 49 is arranged between the diffusion pipe 43 and the throat pipe 48, and the diffusion pipe 43 leads to a water filtering unit. Preferably, the shrink tube 42 is integrally connected to the throat 48. The regulator is used to spray water to the throat 48 and may be replaced by other water supply means.
Wherein, the water filter unit includes water tank 44, and the end of diffuser 43 leads to water tank 44, is equipped with exhaust outlet 410 on the water tank 44, and the end of diffuser 43 slightly immerses under the water tank 44 liquid level, makes waste gas pass through the secondary washing, and water tank 44 design has certain volume for provide buffer space and deposit, discharge the dust particle wherein for the circulating water.
Referring to fig. 2 and 3, the flow guiding structure 49 is fixedly installed in the beginning of the connection between the diffuser 43 and the throat 48, and the flow guiding structure 49 includes a plurality of spiral-rotating flow guiding vanes 490 or flow guiding plates.
Referring to fig. 2 in detail, the inlet pipe 1 is provided at a side portion thereof with an exhaust gas inlet 411, and at an upper portion thereof with a mounting seat 412, and the upper end of the regulator 45 is mounted to the mounting seat 412 so that the regulator 45 can rotate and move up and down. Alternatively, the upper end of the regulator 45 is shown fixedly mounted to the mounting block 412.
Further, an actuator 46 is provided on the mounting base 412, and the actuator 46 controls the regulator 5 to rotate and move up and down.
Meanwhile, the upper end of the regulator 45 is provided with a rotary joint 47, the rotary joint 47 is connected into an external liquid pipeline, and the external liquid pipeline can be kept from rotating when the regulator 45 rotates.
On the other hand, the lower end of the regulator 45 is provided with an injection port, which injects in the radial direction. More preferably, the regulator 45 has a streamlined shape.
In this way, the regulator 45 takes a streamlined shape to reduce the resistance. The rotational movement of actuator 45 enhances turbulence and mixing of the gas-liquid stream in throat 48; the up-and-down movement of the regulator 45 is regulated according to the change of the working condition to adjust the size and flow rate of the gap at the throat 48, thereby ensuring the dust removal efficiency. The regulator 45, which may be a water jet, employs a high velocity radial spray, the atomization of which is not produced by a high velocity gas stream, but rather by a liquid nozzle, the throat merely providing intimate contact between the gas and liquid. Thus, high dust (mist) removal efficiency is not at the expense of high gas pressure drop.
The Venturi wet quenching deacidification tower can be implemented according to the following processes:
the exhaust gas enters the throat of the contraction pipe 42 from the inlet pipe 41; high-pressure liquid enters the regulator 45 through the rotary joint 47 and is sprayed into the throat pipe at high speed and in a rotating manner (under the action of the actuator 46); the liquid drops are mixed with the waste gas at the throat, then enter the diffusion pipe 43, finally enter the water tank 44 for secondary washing, and then are discharged from the waste gas outlet. Then, the dust can be removed again by connecting a demister and the like.
The solid-liquid mixture at the bottom of the two-stage water washing tower is discharged to a filter press 10, the solid filtered by the filter press 10 can be sold for heavy metal recovery, and the discharged waste liquid is discharged to a sewage treatment plant for treatment through a sewage pipeline.
The air outlet of the second-stage water washing tower is communicated with the air inlet of the wet electrostatic dust collector 5 through a pipeline. The gas after passing through the secondary scrubber enters a wet electrostatic precipitator 5, and fine particulate matters as low as 0.5um in the gas, such as water drops, aerosol and the like, are further removed.
One embodiment of the exhaust device is a torch 9, and the other embodiment is composed of a gas drying tower 6, a booster air machine 7 and a gas holder 8. If the oxygen content in the gas is more than or equal to 2 percent, the gas enters a torch 9 for combustion and discharge, if the oxygen content in the synthetic gas is less than 2 percent, then the synthetic gas is dried by a gas drying tower 6 and pressurized by a booster gas machine 7, and the synthetic gas is transferred to a gas storage cabinet 7 for storage to a certain volume and then recycled.
With continued reference to fig. 1, the mobile hazardous waste disposal process of the apparatus according to one or more embodiments includes:
crushing the dangerous waste, and crushing the dangerous waste into the size of less than 100mm in a 4-shaft crusher 1 after compatibility;
conveying the crushed materials to a plasma gasification melting furnace, wherein one embodiment of the conveying of the materials is that the materials are conveyed to a plasma gasification melting furnace 3 by a screw feeder or a hydraulic pusher 2;
treating the dangerous waste in a plasma gasification melting furnace to generate gasification melting, wherein the heat energy in the plasma gasification melting furnace is generated by a plasma torch, and the medium gas of the plasma torch is air, nitrogen and H2Natural gas, etc., the temperature range in the plasma gasification melting furnace is between 1100 and 1600 ℃, in one embodiment, the residence time of the synthetic gas in the furnace exceeds 3s, the reducing atmosphere in the plasma gasification melting furnace is adopted, and the residence time of the synthetic gas exceeds 3s, and no NOx is generated;
the synthesis gas at the outlet of the plasma gasification melting furnace 3 directly enters a two-stage water cooling tower 4, and is cooled, deacidified and dedusted, and the temperature is reduced to be below 100 ℃. In one embodiment, the two-stage water cooling tower 4 is a Venturi wet quenching deacidification tower, the synthesis gas is subjected to wet quenching deacidification by using dilute alkali liquor directly in the Venturi wet quenching deacidification tower to reduce the temperature of the synthesis gas from 1100 ℃ to below 100 ℃, and the liquid-gas ratio in the first-stage water cooling tower is 3-10L/m3The optimal range is 4.5-5L/m3Simultaneously to the acid substances (HCl and H) in the synthesis gas2S) and particles are removed once, volatile heavy metals in the synthesis gas exist in a solution or solid state form in tower bottom liquid after being washed by a large amount of water, and precipitates are formed at the tower bottom by adjusting the pH value of the tower bottom liquid to be 8-11.5; the tower bottom liquid can be further recycled after being subjected to pressure filtration by a pressure filter 10; after the synthesis gas is discharged from the first-stage water-cooling tower, the synthesis gas is fed into a secondary washing tower, and the tower is washed by dilute alkali liquor for the second time, and the liquid gasThe ratio is 1.5-8L/m3The optimal range is 3-4.5L/m3The temperature of the synthesis gas is reduced to about 60 ℃, and acid gas (H) is further generated2S, HCl), heavy metal compounds in the synthesis gas are further washed, the pH value of the bottom liquid of the secondary washing tower is adjusted to 8-11.5, the synthesis gas is enriched at the tower bottom in a precipitation form, the solid can be further recovered after being filter-pressed by a plate filter press 10, the volatile heavy metals can be collected while the synthesis gas is efficiently deacidified and dedusted by adopting a two-stage water cooling tower 4, the enrichment of the volatile heavy metals is facilitated, the recovery of the heavy metals is possible, the corrosion of the synthesis gas to equipment is reduced, the synthesis gas is directly cooled by a large amount of water in the quenching process, the temperature of the synthesis gas is directly reduced from 1100 ℃ to below 100 ℃, the use of a multi-fluid atomizing nozzle is avoided, the synthesis gas purification system is more easily controlled, and the maintenance cost of the system is reduced;
the synthesis gas after passing through the secondary washing tower enters a wet electrostatic dust collector 5, particulate matters in the synthesis gas are further removed, for example, fine particulate matters (water drops, aerosol and the like) with the particle size of as low as 0.5um are further removed, the wet electrostatic dust collector 5 is adopted to well avoid the defect of secondary fly ash generation in the smoke dust removal process of the similar treatment process, and the secondary pollution is reduced;
and (3) performing exhaust treatment, wherein if the oxygen content in the synthetic gas is more than or equal to 2%, the synthetic gas enters a torch 9 to be combusted and discharged, and if the oxygen content in the synthetic gas is less than 2%, the synthetic gas is dried by a gas drying tower 6, pressurized by a booster 7, transferred to a gas storage cabinet 8 to be stored to a certain volume and recycled. And purifying the synthetic gas at the outlet of the plasma furnace, and then selectively discharging the synthetic gas through torch combustion or entering a gas holder for storage and utilization according to the analysis result of the oxygen content of the gas.
In the embodiment, the secondary combustion chamber is omitted, so that the generation of NOx is reduced to the maximum extent, and the denitration burden in the subsequent process is reduced; the use of frequent replacement of the multi-fluid atomizing nozzle is avoided by adopting a wet quenching mode, and the control of the system is simplified; heavy metals and particles in the synthesis gas are washed to the bottom of the tower in a large water washing mode, so that the heavy metals are recycled after being subjected to filter pressing; the wet electrostatic dust collector is used for replacing a bag-type dust collector, so that secondary fly ash can be avoided, and replacement and disposal of a bag can also be avoided.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention, all without departing from the content of the technical solution of the present invention, fall within the scope of protection defined by the claims of the present invention.
Claims (7)
1. Movable hazardous waste disposal system, including plasma gasification melting furnace, its characterized in that still includes:
a water washing tower for cooling, deacidifying and dedusting the gas exhausted from the plasma gasification melting furnace;
the dust removal device is used for further removing dust from the gas discharged from the water washing tower; and
and the exhaust device is used for treating the gas discharged by the dust removal device.
2. The portable hazardous waste disposal system of claim 1, wherein the water wash tower comprises a two-stage water wash tower.
3. The portable hazardous waste disposal system of claim 2, wherein a first stage of the two stages of water scrubbing towers is configured such that a liquid-gas ratio of the sprayed dilute alkali liquid to the inlet gas is 3-10L/m3The second stage water washing tower is configured to spray dilute alkali liquor and the liquid-gas ratio of the inlet gas is 1-8L/m3。
4. The portable hazardous waste disposal system of claim 3, wherein each of said water washing towers is a venturi wet quenching deacidification tower, the bottoms of said two water washing towers are communicated, a regulating device for regulating the pH value of said dilute alkali solution is arranged at the bottom of the tower, and a circulating pump is arranged to recycle the dilute alkali solution at the bottom of the tower to spray gas.
5. The portable hazardous waste disposal system of claim 1, wherein the dust removal device is a wet electrostatic precipitator.
6. The portable hazardous waste disposal system of claim 1, wherein the exhaust device comprises a flare and/or a gas drying tower that dries the exhaust gas, a pressurized gas engine that pressurizes the dried exhaust gas, and a gas storage tank that receives the pressurized exhaust gas.
7. The portable hazardous waste disposal system of claim 1, further comprising a filter press receiving the sediment precipitated at the bottom of the water wash tower or/and the dust removal device.
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| CN201920448813.5U CN210186721U (en) | 2019-04-03 | 2019-04-03 | Movable hazardous waste disposal system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109806708A (en) * | 2019-04-03 | 2019-05-28 | 上海羿诚环保科技有限公司 | Packaged type danger wastes disposal system and technique |
| CN111777045A (en) * | 2020-07-09 | 2020-10-16 | 上海羿诚环保科技有限公司 | Method and device for recovering sulfur in treatment of high-sulfur hazardous waste |
-
2019
- 2019-04-03 CN CN201920448813.5U patent/CN210186721U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109806708A (en) * | 2019-04-03 | 2019-05-28 | 上海羿诚环保科技有限公司 | Packaged type danger wastes disposal system and technique |
| CN111777045A (en) * | 2020-07-09 | 2020-10-16 | 上海羿诚环保科技有限公司 | Method and device for recovering sulfur in treatment of high-sulfur hazardous waste |
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Effective date of registration: 20221130 Address after: 200233 2f2c, building C, 509 Caobao Road, Xuhui District, Shanghai Patentee after: SHANGHAI YICHENG ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Patentee after: ZHEJIANG University Address before: 2F2C, Building C, No. 509, Caobao Road, Shanghai, Xuhui District, Shanghai, 200233 Patentee before: SHANGHAI YICHENG ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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Inventor after: Mao Ding Inventor after: Huang Qunxing Inventor after: Dai Shangwu Inventor after: Wang Qin Inventor after: Shan Boyuan Inventor before: Mao Ding Inventor before: Dai Shangwu Inventor before: Shan Boyuan |
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| CB03 | Change of inventor or designer information |