CN117781305A - Device for indirectly replacing high-temperature hot air heat and application method thereof - Google Patents
Device for indirectly replacing high-temperature hot air heat and application method thereof Download PDFInfo
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- CN117781305A CN117781305A CN202311812544.3A CN202311812544A CN117781305A CN 117781305 A CN117781305 A CN 117781305A CN 202311812544 A CN202311812544 A CN 202311812544A CN 117781305 A CN117781305 A CN 117781305A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003546 flue gas Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000013461 design Methods 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000002918 waste heat Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention discloses a device for indirectly replacing the heat of high-temperature hot air and a use method thereof, and belongs to the technical field of thermal generator set design. Comprises an air preheater unit and a hot air recirculation heating unit; the air preheater unit comprises a cold air inlet pipeline and a hot air outlet pipeline of the air preheater, and a cold air heater is arranged on the cold air inlet pipeline; the hot air recirculation heating unit comprises a recirculation pipeline, wherein an inlet of the recirculation pipeline is communicated with the hot air outlet pipeline, and an outlet of the recirculation pipeline is communicated with the cold air inlet pipeline; the recirculation pipeline is provided with a hot air circulation high-temperature heat exchanger, a hot air circulation low-temperature heat exchanger and a recirculation fan; the recirculation fan is used for enabling the fluid flow direction in the recirculation pipeline to flow out of the hot air outlet pipeline and flow into the cold air preheater inlet pipeline. The flue gas throughput of the air preheater is unchanged, the air throughput is increased, and the heat exchange capacity is improved.
Description
Technical Field
The invention belongs to the technical field of thermal generator set design, and relates to a device for indirectly replacing high-temperature hot air heat and a use method thereof.
Background
After the temperature of cold air entering the air preheater is raised, the energy-saving design scheme in the prior art is an air preheater flue gas bypass scheme, and partial flue gas is discharged because the heat absorption requirement of the air preheater is reduced due to the temperature rise of the cold air, and the air preheater flue gas bypass scheme is used for heating the partial flue gas to heat high-pressure water supply and condensation water, so that energy saving is realized. The energy-saving type boiler is an effective energy-saving design, but a rotary air preheater is generally adopted in the prior large-sized unit, and according to the heat exchange principle of the rotary air preheater, the heat exchange capability of the original preheater can be weakened by adopting a flue gas bypass, so that the temperature of hot air is generally reduced to a certain extent, and the reduction of the temperature of the hot air can bring a certain loss to the efficiency of the boiler.
Disclosure of Invention
The invention aims to solve the technical problem that the heat exchange capacity of an original preheater can be weakened by an energy-saving scheme of a flue gas bypass of a hollow preheater in the prior art, and provides a device for indirectly replacing the heat of high-temperature hot air and a using method thereof.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a device for indirectly replacing the heat of high-temperature hot air, comprising an air preheater unit and a hot air recirculation heating unit; the air preheater unit comprises a cold air inlet pipeline and a hot air outlet pipeline of the air preheater, and a cold air heater is arranged on the cold air inlet pipeline; the hot air recirculation heating unit comprises a recirculation pipeline, wherein an inlet of the recirculation pipeline is communicated with the hot air outlet pipeline, and an outlet of the recirculation pipeline is communicated with the cold air inlet pipeline; the recirculation pipeline is provided with a hot air circulation high-temperature heat exchanger, a hot air circulation low-temperature heat exchanger and a recirculation fan; the hot air circulation high-temperature heat exchanger is used for heating high-pressure water supply; the hot air circulation low-temperature heat exchanger is used for heating condensed water; the recirculation fan is used for enabling the fluid flow direction in the recirculation pipeline to flow out of the hot air outlet pipeline and flow into the cold air inlet pipeline.
The invention further improves that:
and a fan is arranged at the inlet of the cold air inlet pipeline.
And a circulation shutoff baffle is arranged on the recirculation pipeline.
The heat source of the cold air heater is steam, condensed water, circulating water or flue gas waste heat.
The frequency or the movable blade opening degree of the recirculating fan is adjustable.
The air preheater unit comprises a flue gas outlet pipeline and a flue gas inlet pipeline; and a first temperature sensor is arranged on the flue gas outlet pipeline.
And a second temperature sensor is arranged at the outlet of the recirculation fan.
Temperature transmitters are arranged at the inlet and the outlet of the hot air circulation high-temperature heat exchanger; and temperature transmitters are arranged at the inlet and the outlet of the hot air circulation low-temperature heat exchanger.
In a second aspect, the present invention provides a method for using a device for indirectly replacing heat of high-temperature hot wind, comprising the steps of:
step one, a cold air heater is started to heat cold air entering a cold air inlet pipeline to an initial set temperature;
step two, a circulation shutoff baffle is opened, so that hot air in a hot air outlet pipeline enters a recirculation pipeline; the hot air circulation high-temperature heat exchanger and the hot air circulation low-temperature heat exchanger start to work;
observing a temperature sensor, and reducing the heating output of the cold air heater when the temperature of the flue gas is higher than the design temperature; when the temperature of the flue gas is lower than the design temperature, the output of the cold air heater is improved;
observing a temperature sensor, and reducing the hot air circulation flow in the recirculation pipeline when the outlet temperature of the recirculation fan is higher than the cold air temperature at the joint of the recirculation pipeline and the cold air inlet pipeline; when the outlet temperature of the recirculation fan is lower than the cold air temperature at the joint of the recirculation pipeline and the cold air inlet pipeline, the hot air circulation flow in the recirculation pipeline is increased;
fifthly, observing temperature transmitters arranged at an inlet and an outlet of the hot air circulation high-temperature heat exchanger, reducing the high-pressure water supply flow when the outlet temperature is higher than the high-pressure water supply set temperature, and increasing the high-pressure water supply flow when the outlet temperature is lower than the high-pressure water supply set temperature; and observing temperature transmitters arranged at the inlet and the outlet of the hot air circulation low-temperature heat exchanger, reducing the flow of condensed water when the temperature of the outlet is higher than the set temperature of the condensed water, and increasing the flow of the condensed water when the temperature of the outlet is lower than the set temperature of the condensed water.
The invention is further improved in that:
in the third step, the reduction of the hot air circulation flow rate in the recirculation pipeline and the increase of the hot air circulation flow rate in the recirculation pipeline are realized by the following methods:
the above methods are used by adjusting the frequency of the recirculation fan, by adjusting the opening of the movable vanes of the recirculation fan, by adjusting the opening of the shut-off baffle of the recirculation duct, or a combination thereof.
Compared with the prior art, the invention has the following beneficial effects:
compared with a conventional air preheater bypass flue gas waste heat utilization system, the device does not need an air preheater flue gas bypass, so that the weakening of the heat exchange capacity of the air preheater by additionally arranging the flue gas bypass is avoided, redundant heat in cold air is replaced to a hot air circulation high-temperature heat exchanger and a hot air circulation low-temperature heat exchanger which are arranged on a recirculation pipeline through the air preheater, and heat in the hot air circulation bypass is taken away by high-pressure water supply and condensation water. At the moment, the smoke ventilation quantity of the air preheater is unchanged, the air ventilation quantity is increased, and the heat exchange capacity is improved.
The invention discloses a use method of a device for indirectly replacing high-temperature hot air heat, which is characterized in that a temperature sensor and a temperature transmitter are arranged on each pipeline, the temperature sensor and the temperature transmitter are monitored at any time, the recirculation hot air flow in a recirculation pipeline is regulated through a recirculation fan according to the temperature change in the pipeline, the output of a cold air heater is regulated, and the water supply flow of a hot air circulation high-temperature heat exchanger and a hot air circulation low-temperature heat exchanger is regulated, so that the device in the invention is always maintained in an optimal state of performance and cost.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of a device for indirectly replacing the heat of high-temperature hot air in the invention.
Wherein: 1-a fan; 2-a cold air heater; 3-a cold air inlet duct; 4-a flue gas outlet duct; 5-a flue gas inlet duct; 6-a hot air outlet duct; 7-a recirculation duct shut-off flap; 8-a high pressure feed water inlet conduit; 9-a hot air circulation high-temperature heat exchanger; 10-a high pressure feed water outlet conduit; 11-condensate inlet pipe; 12-a hot air circulation low-temperature heat exchanger; 13-a condensate outlet pipe; 14-a hot air recirculation duct; 15-a recirculation fan; 16-a first temperature sensor; 17-a second temperature sensor; 18-a first temperature transmitter; 19-a second temperature transmitter; 20-a third temperature transmitter; 21-a fourth temperature transmitter; 22-air preheater.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, an embodiment of the present invention discloses a device for indirectly replacing heat of high-temperature hot air, comprising an air preheater unit and a hot air recirculation heating unit; the air preheater unit comprises a cold air inlet pipeline 3 and a hot air outlet pipeline 6 of the air preheater 22, a fan 1 is arranged at the inlet of the cold air inlet pipeline 3, a cold air heater 1 is arranged on the cold air inlet pipeline 3, and the heat source of the cold air heater 2 is steam, condensed water, circulating water or flue gas waste heat; the air preheater unit comprises a flue gas outlet duct 4 and a flue gas inlet duct 5; the flue gas outlet duct 4 is provided with a first temperature sensor 16.
The hot air recirculation heating unit comprises a recirculation pipeline 14, wherein an inlet of the recirculation pipeline is communicated with the hot air outlet pipeline 6, and an outlet of the recirculation pipeline is communicated with the cold air inlet pipeline 3; the recirculation pipe 14 is provided with a circulation shut-off baffle 7. The recirculation pipeline 14 is provided with a hot air circulation high-temperature heat exchanger 9, a hot air circulation low-temperature heat exchanger 12 and a recirculation fan 15; the frequency and the opening degree of the movable blades of the recirculation fan 15 are adjustable. The hot air circulating high-temperature heat exchanger 9 is used for heating high-pressure water supply; the hot air circulation low-temperature heat exchanger 12 is used for heating condensed water; the recirculation fan 15 is used for enabling the fluid in the recirculation pipeline 14 to flow out of the hot air outlet pipeline 6 and flow into the cold air inlet pipeline 3. A second temperature sensor 17 is arranged at the outlet of the recirculation fan 15. A first temperature transmitter 18 is arranged at the inlet of the hot air circulation high-temperature heat exchanger 9, and a second temperature transmitter 19 is arranged at the outlet of the hot air circulation high-temperature heat exchanger; the inlet of the hot air circulation low-temperature heat exchanger 12 is provided with a third temperature transmitter 20, and the outlet is provided with a fourth temperature transmitter 21.
Compared with a conventional air preheater bypass flue gas waste heat utilization system, the device does not need an air preheater flue gas bypass, so that the weakening of the heat exchange capacity of the air preheater by additionally arranging the flue gas bypass is avoided, redundant heat in cold air is replaced to a hot air circulation high-temperature heat exchanger and a hot air circulation low-temperature heat exchanger which are arranged on a recirculation pipeline through the air preheater, and heat in the hot air circulation bypass is taken away by high-pressure water supply and condensation water. At the moment, the smoke ventilation quantity of the air preheater is unchanged, the air ventilation quantity is increased, and the heat exchange capacity is improved.
The embodiment of the invention discloses a use method of a device for indirectly replacing high-temperature hot air heat, which comprises the following steps:
step one, a cold air heater 2 is started to heat cold air entering a cold air inlet pipeline 3 to an initial set temperature;
step two, the circulation shutoff baffle 7 is opened, so that hot air in the hot air outlet pipeline 6 enters the recirculation pipeline 14; the hot air circulation high-temperature heat exchanger 9 and the hot air circulation low-temperature heat exchanger 12 start to work;
observing the temperature sensor 16, and reducing the heating output of the cold air heater 2 when the temperature of the flue gas is higher than the design temperature; when the temperature of the flue gas is lower than the design temperature, the output of the cold air heater 2 is improved;
the step three of reducing the flow rate of the hot air circulation in the recirculation pipe 14 and increasing the flow rate of the hot air circulation in the recirculation pipe 14 is achieved by the following method:
the opening of the shut-off flap 7 is adjusted by adjusting the frequency of the recirculation fan 15, by adjusting the opening of the blades of the recirculation fan 15, by adjusting the recirculation duct, or a combination of the above methods.
Observing a temperature sensor 17, and reducing the hot air circulation flow in the recirculation pipeline 14 when the outlet temperature of the recirculation fan 15 is higher than the cold air temperature at the joint of the recirculation pipeline 14 and the cold air inlet pipeline 3; when the outlet temperature of the recirculation fan 15 is lower than the cold air temperature at the connection of the recirculation pipe 14 and the cold air inlet pipe 3, the hot air circulation flow in the recirculation pipe 14 is increased;
fifthly, observing temperature transmitters arranged at the inlet and the outlet of the hot air circulation high-temperature heat exchanger 9, when the outlet temperature is higher than the high-pressure water supply set temperature, reducing the high-pressure water supply flow, and when the outlet temperature is lower than the high-pressure water supply set temperature, increasing the high-pressure water supply flow; observing the temperature transmitters arranged at the inlet and the outlet of the hot air circulation low-temperature heat exchanger 12, when the outlet temperature is higher than the condensate water set temperature, reducing the condensate water flow, and when the outlet temperature is lower than the condensate water set temperature, increasing the condensate water flow.
The invention discloses a use method of a device for indirectly replacing high-temperature hot air heat, which is characterized in that a temperature sensor and a temperature transmitter are arranged on each pipeline, the temperature sensor and the temperature transmitter are monitored at any time, the recirculation hot air flow in a recirculation pipeline is regulated through a recirculation fan according to the temperature change in the pipeline, the output of a cold air heater is regulated, and the water supply flow of a hot air circulation high-temperature heat exchanger and a hot air circulation low-temperature heat exchanger is regulated, so that the device in the invention is always maintained in an optimal state of performance and cost.
The working process of the invention is as follows:
firstly, low-quality heat or waste heat is used for heating cold air, so that the temperature of the cold air exceeds the initial set temperature, the heat of the original air preheater overflows at the moment, and the redundant heat is taken away in a mode of adding a hot air recirculation heating unit; the carried heat enters a recirculation pipeline 14, a high-temperature heat exchanger 9 and a low-temperature heat exchanger 12 are arranged in the recirculation pipeline 14 to transfer the heat to high-pressure water supply and condensation water, and the circulation power of the hot air is maintained by a recirculation fan 15.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The device for indirectly replacing the heat of the high-temperature hot air is characterized by comprising an air preheater unit and a hot air recirculation heating unit; the air preheater unit comprises a cold air inlet pipeline (3) and a hot air outlet pipeline (6) of the air preheater (22), and a cold air heater (2) is arranged on the cold air inlet pipeline (3); the hot air recirculation heating unit comprises a recirculation pipeline (14) with an inlet communicated with the hot air outlet pipeline (6) and an outlet communicated with the cold air inlet pipeline (3); the recirculation pipeline (14) is provided with a hot air circulation high-temperature heat exchanger (9), a hot air circulation low-temperature heat exchanger (12) and a recirculation fan (15); the hot air circulating high-temperature heat exchanger (9) is used for heating high-pressure water supply; the hot air circulation low-temperature heat exchanger (12) is used for heating condensed water; the recirculation fan (15) is used for enabling the fluid in the recirculation pipeline (14) to flow out of the hot air outlet pipeline (6) and flow into the cold air inlet pipeline (3).
2. The device for indirectly replacing high-temperature hot air heat according to claim 1, wherein a fan (1) is arranged at the inlet of the cold air inlet pipeline (3).
3. Device for the indirect replacement of hot wind heat according to claim 1, characterised in that the recirculation duct (14) is provided with a circulation shut-off flap (7).
4. The device for indirectly replacing high-temperature hot air heat according to claim 1, wherein the heat source of the cold air heater (2) is steam, condensed water, circulating water or flue gas waste heat.
5. The device for indirectly replacing the heat of high-temperature hot air according to claim 1, wherein the frequency or the opening degree of a movable blade of the recirculation fan (15) is adjustable.
6. The device for indirectly replacing hot air heat according to claim 1, wherein the air preheater unit comprises a flue gas outlet duct (4) and a flue gas inlet duct (5); the flue gas outlet pipeline (4) is provided with a first temperature sensor (16).
7. Device for indirect displacement of hot wind heat according to claim 1, characterised in that the outlet of the recirculation fan (15) is provided with a second temperature sensor (17).
8. The device for indirectly replacing high-temperature hot air heat according to claim 1, wherein the inlet and the outlet of the hot air circulating high-temperature heat exchanger (9) are provided with temperature transmitters; temperature transmitters are arranged at the inlet and the outlet of the hot air circulation low-temperature heat exchanger (12).
9. The application method of the device for indirectly replacing the heat of the high-temperature hot air is characterized by comprising the following steps of:
step one, a cold air heater (2) is started to heat cold air entering a cold air inlet pipeline (3) to an initial set temperature;
step two, a circulation shutoff baffle (7) is opened, so that hot air in a hot air outlet pipeline (6) enters a recirculation pipeline (14); the hot air circulation high-temperature heat exchanger (9) and the hot air circulation low-temperature heat exchanger (12) start to work;
observing a temperature sensor (16), and reducing the heating output of the cold air heater (2) when the temperature of the flue gas is higher than the design temperature; when the temperature of the flue gas is lower than the design temperature, the output of the cold air heater (2) is improved;
observing a temperature sensor (17), and reducing the hot air circulation flow in the recirculation pipeline (14) when the outlet temperature of the recirculation fan (15) is higher than the cold air temperature at the joint of the recirculation pipeline (14) and the cold air inlet pipeline (3); when the outlet temperature of the recirculation fan (15) is lower than the cold air temperature at the joint of the recirculation pipeline (14) and the cold air inlet pipeline (3), the hot air circulation flow in the recirculation pipeline (14) is increased;
fifthly, observing temperature transmitters arranged at the inlet and the outlet of the hot air circulation high-temperature heat exchanger (9), reducing the high-pressure water supply flow when the outlet temperature is higher than the high-pressure water supply set temperature, and increasing the high-pressure water supply flow when the outlet temperature is lower than the high-pressure water supply set temperature; and observing temperature transmitters arranged at the inlet and the outlet of the hot air circulation low-temperature heat exchanger (12), reducing the flow of condensed water when the outlet temperature is higher than the condensed water set temperature, and increasing the flow of condensed water when the outlet temperature is lower than the condensed water set temperature.
10. The method of using the device for indirectly replacing hot air heat according to claim 9, wherein the reducing the flow rate of hot air in the recirculation duct (14) and the increasing the flow rate of hot air in the recirculation duct (14) in the third step are achieved by:
the method is used by adjusting the frequency of the recirculation fan (15), by adjusting the opening of the movable blades of the recirculation fan (15), by adjusting the opening of the shut-off baffle (7) of the recirculation pipe or by combining the above methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311812544.3A CN117781305A (en) | 2023-12-26 | 2023-12-26 | Device for indirectly replacing high-temperature hot air heat and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311812544.3A CN117781305A (en) | 2023-12-26 | 2023-12-26 | Device for indirectly replacing high-temperature hot air heat and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117781305A true CN117781305A (en) | 2024-03-29 |
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ID=90386653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311812544.3A Pending CN117781305A (en) | 2023-12-26 | 2023-12-26 | Device for indirectly replacing high-temperature hot air heat and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117781305A (en) |
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2023
- 2023-12-26 CN CN202311812544.3A patent/CN117781305A/en active Pending
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