CN114278415A - High-power engine urea injection device and control method - Google Patents
High-power engine urea injection device and control method Download PDFInfo
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- CN114278415A CN114278415A CN202210108227.2A CN202210108227A CN114278415A CN 114278415 A CN114278415 A CN 114278415A CN 202210108227 A CN202210108227 A CN 202210108227A CN 114278415 A CN114278415 A CN 114278415A
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- pipe
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 276
- 239000004202 carbamide Substances 0.000 title claims abstract description 275
- 238000002347 injection Methods 0.000 title claims abstract description 61
- 239000007924 injection Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 123
- 239000007921 spray Substances 0.000 claims abstract description 56
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 238000005507 spraying Methods 0.000 claims abstract description 15
- 239000000243 solution Substances 0.000 claims description 35
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims 3
- 238000002425 crystallisation Methods 0.000 abstract description 4
- 230000008025 crystallization Effects 0.000 abstract description 4
- 230000008014 freezing Effects 0.000 abstract description 3
- 238000007710 freezing Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 50
- 238000000889 atomisation Methods 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses a urea injection device of a high-power engine and a control method, wherein the urea injection device of the high-power engine comprises a urea box, and the urea box is connected with a liquid path system; the tail ends of the liquid path system and the gas path system are connected to a urea spray gun; the outlet of the urea spray gun is arranged in the urea mixing pipe; the liquid path system passes through the gas-liquid control box and then is connected with a urea spray gun through a urea spray pipe; the gas path system passes through the gas-liquid control box and is connected with the urea spray gun through a gas outlet pipe; the liquid path system and the gas path system are connected with the control system. The system has the advantages of simple structure, high metering precision, continuous and stable spraying and good reliability. When the operation is stopped, the liquid path system stops operating firstly, then the gas path system continues to operate for 15-30 s, and residual urea in the liquid path system and the urea spray gun is emptied. The freezing and expansion of urea in a low-temperature environment are prevented from damaging liquid path parts, and the blockage of a nozzle caused by the crystallization of residual urea liquid drops at a spray hole is avoided.
Description
Technical Field
The invention relates to the technical field of urea injection, in particular to a urea injection device of a high-power engine and a control method.
Background
Selective Catalytic Reduction (SCR) technology can effectively solve NO while ensuring dynamic property and economical efficiencyXThe emission problem meets the requirements of environmental protection regulations, and the technology is widely applied in the national IV and V stages of the vehicle diesel engine.
The SCR basic principle is that a reducing agent is injected into an exhaust pipe of the diesel engine through a urea injection device, and the reducing agent and NO are mixed under the action of a catalystXReaction takes place to convert NOXEmissions control is within regulatory limits. The whole system consists of a urea injection device and a urea mixing and catalyzing device.
The urea injection device constantly calculates the current required urea injection amount according to the working condition of the engine, realizes the accurate control of the injection amount and ensures that the urea is sprayed out to obtain ideal spraying characteristics; the urea is rapidly mixed with the high-temperature waste gas under the action of the mixing device, so that the urea is decomposed into NH by heat absorption3(reaction 1); last NH3With NO in the presence of a catalystXReact to eliminate NOXFor the purpose of discharge (reactions 2, 3).
(NH2)2CO+H2O→CO2+2NH3 (1)
4NO+4NH3+O2→4N2+6H2O (2)
NO+NO2+2NH3→2N2+3H2O (3)
Urea injection devices are mainly classified into an air-assisted type and a non-air-assisted type according to different urea atomization modes. The non-air-assisted injection utilizes a urea pump to form high-pressure urea, the urea injection quantity is measured by controlling the opening frequency and the duration of a nozzle, and the liquid injection atomization is realized when the high-pressure urea passes through a small hole of the urea nozzle; the air-assisted injection utilizes a metering pump to measure urea, and high-pressure air is utilized to break up liquid urea at the end of a urea nozzle to realize injection atomization. Compared with non-air-assisted injection, the air-assisted injection of urea liquid drops has better atomization, is favorable for mixing and rapid decomposition of urea and waste gas, and is favorable for preventing the SCR exhaust pipe from crystallizing and improving the comprehensive performance of the SCR system.
The maximum urea spraying capacity of the urea spraying device applied to the current market is usually less than or equal to 7.5L/h, and the urea spraying device can be matched with a vehicle engine below 480 kW; for a high-power diesel engine with the power of more than 480kW, more urea solution needs to be sprayed to meet the emission requirement due to high engine power, and the existing product urea has insufficient spraying capability and cannot meet the matching requirement of the high-power diesel engine.
The urea injection capacity requirement can be met by adopting a mode that two, three or even a plurality of automobile engine urea injection devices are connected in parallel, however, along with the increase of the urea injection devices connected in parallel, the whole set of injection and control system becomes extremely complex, the cost is greatly increased, and the reliability is difficult to guarantee.
Disclosure of Invention
The invention aims to solve the problems and provides a urea injection device of a high-power engine and a control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a urea injection device of a high-power engine comprises a urea box, wherein the urea box is connected with a liquid path system;
the tail ends of the liquid path system and the gas path system are connected to a urea spray gun;
the outlet of the urea spray gun is arranged in the urea mixing pipe;
the liquid path system passes through the gas-liquid control box and then is connected with the urea spray gun through a urea spray pipe;
the gas path system passes through the gas-liquid control box and then is connected with the urea spray gun through a gas outlet pipe;
and the liquid path system and the gas path system are connected with the control system.
The liquid path system comprises a liquid suction branch and a liquid return branch;
the liquid suction branch comprises a urea liquid suction pipe, and the urea box is connected with the gas-liquid control box through the urea liquid suction pipe;
the liquid return branch comprises a urea liquid return pipe, and the urea liquid return pipe communicates the gas-liquid control box with the urea box.
The liquid suction branch also comprises a urea metering pump and a back pressure valve which are arranged in the gas-liquid control box; the backpressure valve is used for maintaining the backpressure of the outlet of the urea metering pump to be stable and ensuring the metering precision of the urea metering pump;
the urea metering pump is connected with the control system; the urea metering pump receives the instruction of the control system and accurately meters the urea solution according to the requirement of the urea injection rate;
one end of the urea metering pump is connected with the urea liquid suction pipe, the other end of the urea metering pump is connected with the inlet of the back pressure valve, and the outlet of the back pressure valve is connected with a urea injection pipe outside the gas-liquid control box.
And a filter is also arranged between the urea liquid suction pipe and the urea metering pump and is arranged outside the gas-liquid control box. The filter filters the urea solution entering the urea metering pump, so that the cleanness of the urea solution is ensured, and the urea metering pump is prevented from being blocked by impurities.
And the outlet of the backpressure valve is also connected with a pulse damper. The pulse damper is used for ensuring the pressure stability of the urea solution entering the urea spray gun.
The liquid return branch also comprises a liquid return electromagnetic valve arranged inside the gas-liquid control box;
the liquid return electromagnetic valve is arranged between the outlet of the backpressure valve and the urea liquid return pipe. Before the urea injection device stops working, the liquid return electromagnetic valve is conducted, and urea solution in the urea spray gun and the urea injection pipe flows back to the urea box through the urea liquid return pipe.
The gas circuit system comprises a gas inlet pipe arranged outside the gas-liquid control box;
the gas inlet pipe is sequentially connected with a pressure regulating valve, a gas circuit electromagnetic valve and a pressure sensor inside the gas-liquid control box through pipelines; and the pressure sensor and the gas circuit electromagnetic valve are connected with the control system.
The pressure regulating valve is used for regulating the gas pressure in the gas inlet pipe and ensuring the stable pressure of the gas circuit; the gas path electromagnetic valve is used for receiving the instruction of the control system and controlling the on-off of the gas path according to the working requirement; the control system is also provided with an alarm, the pressure sensor detects the pressure value of the gas circuit at any time, once the pressure exceeds the limit, the control system controls the alarm to give an alarm and stop urea injection, so that the urea is prevented from being atomized badly due to the exceeding of the pressure and urea crystallization in the urea mixing pipe is avoided;
the pressure sensor is connected with the gas outlet pipe outside the gas-liquid control box through a pipeline.
The control method for the urea injection device of the high-power engine comprises the following steps:
step one, a control system controls a gas circuit system to work and sends compressed gas to a urea spray gun;
step two, the control system controls the liquid path system to work, and the metered set amount of urea solution is conveyed to a urea spray gun after being stabilized;
thirdly, mixing the compressed gas and the urea solution at the rear end of the urea spray gun, scattering and atomizing into liquid drops, and spraying the liquid drops into a urea mixing pipe at a set angle;
step four, when the work is finished, the liquid path system stops working firstly, and the urea solution in the liquid path system is sent back to the urea box; and stopping working after the working set time of the gas circuit system.
In the fourth step, when the work is finished, the urea solution in the urea spray gun and the urea injection pipe is pressed back to the urea box through the urea return pipe by means of the throttling function of the urea spray gun and the pressure of the air circuit.
In the fourth step, after the liquid path system stops working, the gas path system keeps working for 15-30 s, and residual urea in the urea spray gun is emptied.
The invention has the beneficial effects that:
the system has simple structure, high metering precision, continuous and stable spraying and good reliability.
When the invention is finished, the urea metering pump stops working first, and the gas circuit system is kept open for 15-30 s. By means of the throttling action of the urea spray gun and the pressure of the air passage, the urea solution in the urea spray gun and the urea injection pipe is pressed back to the urea box through the urea liquid return pipe, the urea solution in the pipeline is emptied, and the urea is prevented from freezing and expanding under the low-temperature environment to damage liquid passage parts; meanwhile, a small amount of residual urea solution at the spray head of the urea spray gun is blown into the urea mixing pipe to empty the urea in the urea spray gun, so that the blockage of the spray nozzle caused by the crystallization of residual urea liquid drops at the spray hole is avoided.
Drawings
FIG. 1 is a structural diagram of a urea injection device of a high-power diesel engine according to the invention;
the system comprises a urea box 1, a urea liquid suction pipe 2, a Y-shaped filter 3, a urea metering pump 4, a back pressure valve 5, a pulse damper 6, a urea injection pipe 7, an air outlet pipe 8, a urea spray gun 9, a urea mixing pipe 10, an air inlet pipe 11, a pressure regulating valve 12, a gas circuit electromagnetic valve 13, a pressure sensor 14, a liquid return electromagnetic valve 15, a urea liquid return pipe 16 and a gas-liquid control box 17.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in FIG. 1, a urea injection device for a high-power engine comprises a liquid path system and a gas path system;
the liquid path system comprises a urea box 1, a urea liquid suction pipe 2, a Y-shaped filter 3, a urea metering pump 4, a back pressure valve 5, a pulse damper 6, a urea injection pipe 7, a liquid return electromagnetic valve 15 and a urea liquid return pipe 16; wherein, the urea metering pump 4, the backpressure valve 5, the pulse damper 6 and the liquid return electromagnetic valve 15 are arranged in the gas-liquid control box 17;
the urea box 1 is sequentially connected with a urea liquid suction pipe 2, a Y-shaped filter 3, a urea metering pump 4, a back pressure valve 5 and a pulse damper 6 through pipelines; the backpressure valve 5 and the pulse damper 6 are connected with a liquid return electromagnetic valve through a pipeline and then are connected with the urea box 1 through a urea liquid return pipe.
The gas path system comprises a gas inlet pipe 11, a pressure regulating valve 12, a gas path electromagnetic valve 13, a pressure sensor 14 and a gas outlet pipe 8 which are connected in sequence. The pressure regulating valve 12, the gas path electromagnetic valve 13 and the pressure sensor 14 are arranged in a gas-liquid control box 17.
Mixing the liquid path system and the gas path system in the urea spray gun 9, spraying urea into the urea mixing pipe 10 as NOXCatalytic reduction provides the reducing agent.
And the liquid path system and the gas path system are connected with a peripheral control system.
The functions of each part of the urea injection device of the high-power engine are as follows:
the Y-shaped filter 3: filtering the urea solution entering the urea metering pump 4 to ensure the cleanness of the urea solution and prevent the urea metering pump 4 from being blocked by impurities;
and 4, a urea metering pump: receiving a control system instruction, and accurately metering the urea solution according to the requirement of the urea injection rate;
back pressure valve 5: the back pressure of the outlet of the urea metering pump 4 is kept stable, and the metering precision of the urea metering pump 4 is ensured;
the pulse damper 6: the pressure fluctuation of the urea solution is reduced, and the pressure stability of the urea solution entering the urea spray gun 9 is ensured;
the pressure regulating valve 12: the gas pressure in the gas inlet pipe 11 is adjusted to ensure the stable pressure of the gas circuit;
gas circuit solenoid valve 13: receiving a control system instruction, and performing on-off control on the gas path according to the working requirement;
the pressure sensor 14: detecting the pressure value of the gas circuit in real time, and once the pressure exceeds the limit, the control system gives an alarm to prompt and stops urea injection, so that the urea is prevented from being atomized badly due to the pressure exceeding the limit and urea in the urea mixing pipe 10 is prevented from crystallizing;
liquid return electromagnetic valve 15: before the urea injection device stops working, the electromagnetic valve is conducted, and the urea solution in the urea spray gun 9 and the urea injection pipe 7 flows back to the urea box 1 through the urea return pipe 16.
The control method for the urea injection device of the high-power engine is adopted, the method meets the requirements of an SCR system of the high-power engine with the power of more than 480kW, and comprises the following steps:
step one, a control system controls a gas circuit system to work and sends compressed gas to a urea spray gun;
step two, the control system controls the liquid path system to work, and the metered set amount of urea solution is conveyed to a urea spray gun after being stabilized;
thirdly, mixing the compressed gas and the urea solution at the rear end of the urea spray gun, scattering and atomizing into liquid drops, and spraying the liquid drops into a urea mixing pipe at a set angle;
step four, when the work is finished, the liquid path system stops working firstly, and the urea solution in the liquid path system is sent back to the urea box; and stopping working after the working set time of the gas circuit system.
In the fourth step, when the work is finished, the urea solution in the urea spray gun and the urea injection pipe is pressed back to the urea box through the urea return pipe by means of the throttling function of the urea spray gun and the pressure of the air circuit.
In the fourth step, after the liquid path system stops working, the gas path system keeps working for 15-30 s, and residual urea in the urea spray gun is emptied.
Specifically, before urea injection, the gas circuit system is firstly opened, the liquid circuit system is filled with urea, preparation is made for urea injection, and the process is as follows:
the control system drives the gas circuit electromagnetic valve 13 to be conducted, and external compressed air passes through the gas inlet pipe 11, sequentially passes through the pressure regulating valve 12, the gas circuit electromagnetic valve 13 and finally reaches the urea spray gun 9 through the gas outlet pipe 8.
This process control system monitors gas circuit pressure constantly through pressure sensor 14, if gas circuit pressure is in normal range, urea measuring pump 4 begins work, is full of urea with the liquid path system, and the process is as follows:
a urea metering pump 4 extracts urea solution from the urea tank 1 through a urea liquid suction pipe 2 and a Y-shaped filter 3; after being pumped by the urea metering pump 4, the urea solution finally reaches the urea spray gun 9 through the backpressure valve 5, the pulse damper 6 and the urea injection pipe 7, so that the liquid path is filled with urea and is ready for urea injection.
In the urea injection process, the gas path system is kept conducted, and the urea metering pump 4 meters urea according to the control requirement. The urea solution is mixed with air at the rear end of the urea spray gun 9, the urea solution is scattered and atomized into fine liquid drops under the action of the throttling of the urea spray gun 9 and the disturbance and the shearing force of compressed air, and the fine liquid drops are sprayed into the urea mixing pipe 10 at a proper angle, wherein NO isXCatalytic reduction provides the reducing agent.
When the work is finished, the urea metering pump 4 stops working, the air path system is kept open for 15-30 s, and the liquid return electromagnetic valve 15 is conducted. By means of the throttling function of the urea spray gun 9 and the pressure of the air path, the urea solution in the urea spray gun 9 and the urea injection pipe 7 is pressed back to the urea box 1 through the urea liquid return pipe 16, the urea solution in the pipeline is emptied, and the urea is prevented from freezing and expanding under the low-temperature environment to damage liquid path parts; meanwhile, a small amount of residual urea solution at the spray head of the urea spray gun 9 is blown into the urea mixing pipe 10 to empty the urea in the urea spray gun 9, so that the blockage of the spray nozzle caused by the crystallization of residual urea liquid drops at the spray hole is avoided.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A urea injection device of a high-power engine is characterized by comprising a urea box, wherein the urea box is connected with a liquid path system;
the tail ends of the liquid path system and the gas path system are connected to a urea spray gun;
the outlet of the urea spray gun is arranged in the urea mixing pipe;
the liquid path system passes through the gas-liquid control box and then is connected with the urea spray gun through a urea spray pipe;
the gas path system passes through the gas-liquid control box and then is connected with the urea spray gun through a gas outlet pipe;
and the liquid path system and the gas path system are connected with the control system.
2. The high power engine urea injection apparatus according to claim 1, wherein the fluid path system comprises a fluid suction branch and a fluid return branch;
the liquid suction branch comprises a urea liquid suction pipe, and the urea box is connected with the gas-liquid control box through the urea liquid suction pipe;
the liquid return branch comprises a urea liquid return pipe, and the urea liquid return pipe communicates the gas-liquid control box with the urea box.
3. The high power engine urea injection device according to claim 2, wherein the liquid suction branch further comprises a urea metering pump and a back pressure valve arranged in the gas-liquid control box;
the urea metering pump is connected with the control system;
one end of the urea metering pump is connected with the urea liquid suction pipe, the other end of the urea metering pump is connected with the inlet of the back pressure valve, and the outlet of the back pressure valve is connected with a urea injection pipe outside the gas-liquid control box.
4. The urea spraying device for the high-power engine according to claim 3, wherein a filter is further arranged between the urea liquid suction pipe and the urea metering pump, and the filter is arranged outside the gas-liquid control box.
5. The urea spraying device for the high-power engine as claimed in claim 3, wherein the outlet of the back pressure valve is further connected with a pulse damper.
6. A high power engine urea injection device as defined in claim 3, wherein said liquid return branch further comprises a liquid return solenoid valve disposed inside said gas-liquid control box;
the liquid return electromagnetic valve is arranged between the outlet of the backpressure valve and the urea liquid return pipe.
7. The urea injection device for the high-power engine according to claim 1, wherein the gas path system comprises a gas inlet pipe arranged outside the gas-liquid control box;
the gas inlet pipe is sequentially connected with a pressure regulating valve, a gas circuit electromagnetic valve and a pressure sensor inside the gas-liquid control box through pipelines;
the pressure sensor is connected with the gas outlet pipe outside the gas-liquid control box through a pipeline;
and the pressure sensor and the gas circuit electromagnetic valve are connected with the control system.
8. The method for controlling a urea injection device of a high-power engine according to claim 1, comprising:
step one, a control system controls a gas circuit system to work and sends compressed gas to a urea spray gun;
step two, the control system controls the control liquid path system to work, and the metered set amount of urea solution is sent to a urea spray gun after being filtered and stabilized;
thirdly, mixing the compressed gas and the urea solution at the rear end of the urea spray gun, scattering and atomizing into liquid drops, and spraying the liquid drops into a urea mixing pipe at a set angle;
step four, when the work is finished, the liquid path system stops working firstly, and the urea solution in the liquid path system is sent back to the urea box; and stopping working after the working set time of the gas circuit system.
9. The method for controlling a urea injection device of a high-power engine according to claim 8, wherein in the fourth step, the urea solution in the urea injection lance and the urea injection pipe is returned to the urea tank through the urea return pipe by means of the throttling action of the urea injection lance and the pressure of the air passage at the end of the operation.
10. The method for controlling a urea spraying device of a high-power engine according to claim 8, wherein in the fourth step, after the liquid path system stops working, the gas path system keeps working for 15-30 s, and residual urea in the urea spraying gun is emptied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210108227.2A CN114278415A (en) | 2022-01-28 | 2022-01-28 | High-power engine urea injection device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210108227.2A CN114278415A (en) | 2022-01-28 | 2022-01-28 | High-power engine urea injection device and control method |
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| Publication Number | Publication Date |
|---|---|
| CN114278415A true CN114278415A (en) | 2022-04-05 |
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ID=80881675
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210108227.2A Pending CN114278415A (en) | 2022-01-28 | 2022-01-28 | High-power engine urea injection device and control method |
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| Country | Link |
|---|---|
| CN (1) | CN114278415A (en) |
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2022
- 2022-01-28 CN CN202210108227.2A patent/CN114278415A/en active Pending
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Effective date of registration: 20231008 Address after: Room 801-3, Gaoxin Building, North of Yuqing East Street, Yuqing Community, Xincheng Street, Gaoxin District, Weifang City, Shandong Province, 261041 Applicant after: Shandong Xiushi Environmental Protection Technology Co.,Ltd. Address before: 262711 south of 1000m east of the intersection of North Ring Road and Tegang Road, Gucheng street, Shouguang City, Weifang City, Shandong Province Applicant before: SHANDONG KANGJUN ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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