CN110939942A - Adjustable multi-return-stroke dust removal integrated device for high-temperature air preheater - Google Patents

Adjustable multi-return-stroke dust removal integrated device for high-temperature air preheater Download PDF

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Publication number
CN110939942A
CN110939942A CN201911313194.XA CN201911313194A CN110939942A CN 110939942 A CN110939942 A CN 110939942A CN 201911313194 A CN201911313194 A CN 201911313194A CN 110939942 A CN110939942 A CN 110939942A
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CN
China
Prior art keywords
chamber
air
dust removal
return
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201911313194.XA
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Chinese (zh)
Inventor
孙正
朱丽萍
花志田
孙小丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANGSU ZHENGYANG BOILER CO Ltd
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JIANGSU ZHENGYANG BOILER CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by JIANGSU ZHENGYANG BOILER CO Ltd filed Critical JIANGSU ZHENGYANG BOILER CO Ltd
Priority to CN201911313194.XA priority Critical patent/CN110939942A/en
Publication of CN110939942A publication Critical patent/CN110939942A/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Supply (AREA)

Abstract

The invention discloses an adjustable multi-return-stroke high-temperature air preheater dust removal integrated device, relates to the technical field of air preheater devices, and particularly relates to an adjustable multi-return-stroke high-temperature air preheater dust removal integrated device. This adjustable many return strokes high temperature air heater dust removal integrated device lets in left smoke chamber through abandonment with the high temperature to make high temperature waste gas get into the first return stroke pipe middle part of flue gas, cold air gets into from the left cold air intake pipe in the outside hot-air room of the first return stroke pipe of flue gas, carries out the heat exchange with high temperature waste gas in the outside hot-air room of the first return stroke pipe of flue gas, hot-air two rooms, hot-air three rooms, reaches the purpose that risees the cold air temperature.

Description

Adjustable multi-return-stroke dust removal integrated device for high-temperature air preheater
Technical Field
The invention relates to the technical field of air preheaters, in particular to an adjustable multi-return-stroke high-temperature air preheater dust removal integrated device.
Background
The air preheater is a heating surface which utilizes waste heat flue gas to heat air, intensify combustion and desulfurize harmful flue gas, and the flue gas in the tail flue preheats the air before entering the boiler to a certain temperature through the internal radiating fins, and is a device for improving the heat exchange performance of the boiler and reducing the energy consumption.
The existing air preheater can only heat cold air once due to simple structure, and then can only output gas with one temperature, the structure can ensure that the heat inside the waste flue gas can not be fully utilized, the conversion of the heat efficiency is reduced, in addition, because the waste flue gas is generally generated from waste incineration, the waste flue gas generated when the waste is incinerated is small and large, and the utilization of the heated air is difficult to control.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an adjustable multi-return-stroke high-temperature air preheater dust removal integrated device which has the advantages of improving the heat efficiency, realizing stable control, prolonging the service life and the like, and solves the problems in the background technology.
(II) technical scheme
In order to achieve the purposes of improving the thermal efficiency, realizing stable control and prolonging the service life, the invention is realized by the following technical scheme: the utility model provides an adjustable many return strokes high temperature air heater dust removal integrated device, includes a hot-air room, the top fixed mounting of support has the casing, the left side fixed mounting at casing top has left smoke chamber, and the right side fixed mounting at casing top has right smoke chamber, the middle part fixed mounting of casing has two rows of spiral heat exchange tubes of equipartition in the casing inside, spiral heat exchange tube left side is the first return stroke pipe of flue gas, and the right side of spiral heat exchange tube is flue gas second return stroke pipe, the outside top-down of the first return stroke pipe of flue gas respectively fixed mounting have run through to the outside hot-air room of casing, hot-air second room, hot-air three room, and the left side fixed mounting of the outside hot-air three room of flue gas first return stroke pipe has first hot-air export, the outside of flue gas second return stroke pipe from bottom to top fixed mounting have run through to the outside, Two rooms of hot-air, a room of hot-air, and the left side fixed mounting of the outside room of hot-air of flue gas second return pipe has the export of second hot-air, the bottom fixed mounting of casing has gyration dust removal smoke chamber, and the bottom fixed mounting of gyration dust removal smoke chamber has the ash discharge pipe, the inside fixed mounting of ash discharge pipe has the second ash discharge valve, and the inside fixed mounting of ash discharge pipe has the first ash discharge valve that is located second ash discharge valve below, the outside fixed mounting of left side smoke chamber and right smoke chamber has wear-resisting anticorrosive coating.
Preferably, the first hot air chamber and the second hot air chamber outside the first flue gas return pipe are fixedly communicated, the top of the first flue gas return pipe is fixedly communicated with the left smoke chamber, and the bottom of the first flue gas return pipe is fixedly communicated with the rotary dust removal smoke chamber.
Preferably, the hot air three chamber, the hot air two chamber and the hot air first chamber outside the smoke second return pipe are fixedly communicated, the top of the smoke second return pipe is fixedly communicated with the right smoke chamber, the bottom of the hot air three chamber outside the smoke second return pipe is fixedly communicated with the rotary dust removal smoke chamber,
preferably, the right side fixed mounting of right side smoke chamber has the bypass flue, the left side of the outside hot-air room of the first return pipe of flue gas and the left side fixed mounting of the outside hot-air room of flue gas second return pipe have the cold air intake pipe, and at the first return pipe of flue gas, flue gas second return pipe and left smoke chamber, right smoke chamber and gyration dust removal smoke chamber's kneck add anticorrosive coating.
Preferably, the top of gyration dust removal smoke chamber installs dust removal whirl board device additional, and sets up arc dust fall board around the inside of gyration dust removal smoke chamber, and has increased anticorrosive coating in the inside of gyration dust removal smoke chamber.
Preferably, the adjustable device is fixedly installed inside the left smoke chamber, the adjustable device is internally provided with a movable sheet, the adjustable device is externally provided with two groups of combinations of the movable sheet, the first return pipe of the smoke is a low-temperature section, and the second return pipe of the smoke is a high-temperature section.
(III) advantageous effects
The invention provides an adjustable multi-return-stroke high-temperature air preheater dust removal integrated device, which has the following beneficial effects:
1. the adjustable multi-return-stroke high-temperature air preheater dust removal integrated device is characterized in that high-temperature waste gas is introduced into a left smoke chamber, so that high-temperature waste gas enters the middle of a first return pipe of smoke, cold air enters from a cold air inlet pipe on the left side of a first hot air chamber outside the first return pipe of smoke, the first hot air chamber, the second hot air chamber and the third hot air chamber outside the first return pipe of smoke exchange heat with the high-temperature waste gas to achieve the purpose of increasing the temperature of the cold air, the heated cold air is led out from a first hot air outlet, the high-temperature waste gas is further led into a rotary dust removal smoke chamber, a dust removal cyclone device is additionally arranged inside the rotary dust removal smoke chamber to treat the high-temperature waste gas, the content of harmful substances and dust in the high-temperature waste gas is reduced, and the treated high-temperature waste gas further enters the third hot air chamber and the second hot air chamber outside the, In the hot air room, heat up the cold air once more, the cold air through the intensification is derived from the export of second hot air, and the device can carry out the secondary heat exchange to the air, has improved the efficiency of heat exchange, the waste heat in the make full use of waste gas, and in addition, the inside dust removal whirl device of gyration dust removal smoke chamber is further handled high temperature waste gas, has reduced the content of dust and harmful substance in the high temperature waste gas, has reduced the harm to the environment.
2. This adjustable many return strokes high temperature air heater integrated device that removes dust, through the adjustable device of left smoke chamber inside, the flow of control high temperature waste gas, thereby make high temperature waste gas become controllable, further realized the holistic control of the device, the controllability of cold air heat exchange has been realized, wear-resisting anticorrosive coating layer has been add at the heat exchange tube exit in addition, the heat resistance of exit junction has been improved, wear-resisting anticorrosive coating layer is add at the gyration smoke chamber, the device's life has further been improved, the probability that the device appears damaging has been reduced, and the production cost is saved.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a side cross-sectional structural schematic view of the present invention;
FIG. 4 is a schematic structural diagram of the high and low temperature sections of the present invention.
In the figure: 1. a first chamber of hot air; 2. a second hot air chamber; 3. a hot air three-chamber; 4. a spiral heat exchange tube; 5. a wear-resistant anticorrosive layer; 6. a cold air inlet pipe; 7. a housing; 8. a rotary dust removal smoke chamber; 9. a support; 10. a first hot air outlet; 11. a second hot air outlet; 12. a first return pipe for flue gas; 13. a second return pipe for flue gas; 14. a first ash discharge valve; 15. a second ash discharge valve; 16. a high temperature section; 17. a low temperature section; 18. a waste heat flue gas inlet; 19. a left smoking chamber; 20. and a right smoke chamber.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1 to 4, the present invention provides a technical solution: an adjustable multi-return-stroke dust removal integrated device for a high-temperature air preheater comprises a hot air first chamber 1, a shell 7 is fixedly mounted at the top of a support 9, a left smoke chamber 19 is fixedly mounted at the left side of the top of the shell 7, a right smoke chamber 20 is fixedly mounted at the right side of the top of the shell 7, two rows of spiral heat exchange tubes 4 uniformly distributed in the shell 7 are fixedly mounted in the middle of the shell 7, a first smoke return tube 12 is arranged at the left side of each spiral heat exchange tube 4, a second smoke return tube 13 is arranged at the right side of each spiral heat exchange tube 4, the hot air first chamber 1, the hot air second chamber 2 and the hot air third chamber 3 penetrating the shell 7 from top to bottom are respectively and fixedly mounted outside the first smoke return tube 12 from the left side of the hot air third chamber 3 outside the first smoke return tube 12, a first hot air outlet 10 is fixedly mounted outside the second smoke return tube 13 from bottom to top, and a hot air, The hot air two-chamber 2, the hot air one-chamber 1, and the left side fixed mounting of the outside hot air one-chamber 1 of flue gas second return pipe 13 has second hot air export 11, the bottom fixed mounting of casing 7 has gyration dust removal smoke chamber 8, and the bottom fixed mounting of gyration dust removal smoke chamber 8 has the ash discharge pipe, the inside fixed mounting of ash discharge pipe has second ash discharge valve 15, and the inside fixed mounting of ash discharge pipe has the first ash discharge valve 14 that is located second ash discharge valve 15 below, the outside fixed mounting of left smoke chamber 19 and right smoke chamber 20 has wear-resisting anticorrosive coating 5.
The first hot air chamber 1 and the second hot air chamber 2 and the third hot air chamber 3 outside the first flue gas return pipe 12 are fixedly communicated, the top of the first flue gas return pipe 12 is fixedly communicated with the left smoke chamber 19, the bottom of the first flue gas return pipe 12 is fixedly communicated with the rotary dedusting smoke chamber 8, high-temperature waste is introduced into the left smoke chamber 19, so that high-temperature waste gas enters the middle of the first flue gas return pipe 12, cold air enters from a cold air inlet pipe 6 on the left side of the first hot air chamber 1 outside the first flue gas return pipe 12, and the first hot air chamber 1, the second hot air chamber 2 and the third hot air chamber 3 outside the first flue gas return pipe 12 exchange heat with the high-temperature waste gas, so that the purpose of increasing the temperature of the cold air is achieved, the reutilization of the high-temperature waste gas is realized, the utilization rate of each energy source is improved, and energy sources are saved.
The device comprises a flue gas second return pipe 13, a hot air three-chamber 3, a hot air two-chamber 2 and a hot air one-chamber 1, wherein the hot air three-chamber 3, the hot air two-chamber 2 and the hot air one-chamber 1 outside the flue gas second return pipe 13 are fixedly communicated, the top of the flue gas second return pipe 13 is fixedly communicated with a right smoke chamber 20, the bottom of the hot air three-chamber 3 outside the flue gas second return pipe 13 is fixedly communicated with a rotary dust removal smoke chamber 8, the processed high-temperature waste gas further enters the hot air three-chamber 3, the hot air two-chamber 2 and the hot air one-chamber 1 outside the flue gas second return pipe 13, the temperature of the cold air is raised again, the raised cold air is led out from a second hot air outlet 11, the device can perform secondary heat exchange on the air.
Wherein, the right side fixed mounting of right side smoke chamber 20 has the bypass flue, the left side of the outside hot-air room 1 of flue gas first return pipe 12 and the left side fixed mounting of the outside hot-air room 1 of flue gas second return pipe 13 have cold air intake pipe 6, and at flue gas first return pipe 12, flue gas second return pipe 13 and left smoke chamber 19, anticorrosive coating has been add at the kneck of right smoke chamber 20 and gyration dust removal smoke chamber 8, the flue on right side smoke chamber 20 can be with handling the discharge of back exhaust gas, the inside atmospheric pressure of the device has been reduced, the probability that the device damaged has further been reduced, service life is prolonged, anticorrosive coating has been add at the kneck simultaneously, the probability that the device damaged has further been reduced, service life is prolonged.
Wherein, the top of gyration dust removal smoke chamber 8 adds and is equipped with dust removal whirl board device, and the inside arc dust fall board that sets up all around of gyration dust removal smoke chamber 8, and at the inside anticorrosive coating that has increased of gyration dust removal smoke chamber 8, the cold air through intensification is derived from first hot-air outlet 10, and high temperature waste gas further channels into in the gyration dust removal smoke chamber 8, because the inside dust removal whirl device that adds of gyration dust removal smoke chamber 8, handle high temperature waste gas, the content of harmful substance and dust in the high temperature waste gas has been reduced, the inside dust removal whirl device of gyration dust removal smoke chamber 8 further handles high temperature waste gas, the content of dust and harmful substance in the high temperature waste gas has been reduced, the harm to the environment has been reduced.
Wherein, the inside fixed mounting of left smoke chamber 19 has adjustable device, and the interior movable plate that divides of adjustable device, divide movable plate two sets of each 4 combinations of outer, the first return pipe 12 of flue gas is low temperature section 17, and flue gas second return pipe 13 is high temperature section 16, through the adjustable device of left smoke chamber 19 inside, the flow of control high temperature waste gas, thereby make high temperature waste gas become controllable, further realized the holistic control to the device, realized the controllability of cold air heat exchange, further made the air temperature and the velocity of flow after the intensification stable, improved the utilization ratio of air.
In conclusion, when the dust removal integrated device of the adjustable multi-return high-temperature air preheater is used, high-temperature waste gas is introduced into the left smoke chamber 19, so that high-temperature waste gas enters the middle of the first smoke return pipe 12, cold air enters from the cold air inlet pipe 6 on the left side of the first hot air chamber 1 outside the first smoke return pipe 12, the hot air chamber 1, the second hot air chamber 2 and the third hot air chamber 3 outside the first smoke return pipe 12 exchange heat with the high-temperature waste gas to achieve the purpose of raising the temperature of the cold air, the warmed cold air is led out from the first hot air outlet 10, the high-temperature waste gas is further led into the rotary dust removal smoke chamber 8, the dust removal cyclone device is additionally arranged inside the rotary dust removal smoke chamber 8 to treat the high-temperature waste gas, and the treated high-temperature waste gas further enters the third hot air chamber 3 and the second hot air chamber 2 outside the second smoke return pipe 13, In the first hot air room 1, the cold air is heated again, the heated cold air is led out from the second hot air outlet 11, the device can perform secondary heat exchange on the air, the heat exchange efficiency is improved, the flow of high-temperature waste gas is controlled through the adjustable device in the left smoke chamber 19, so that the high-temperature waste gas is controllable, the controllability of the cold air heat exchange is realized, the heated air is stable in output, the accumulated dust is discharged through the second dust discharge valve 15 and the first dust discharge valve 14, and the device is overhauled regularly.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The utility model provides an adjustable many return strokes high temperature air heater dust removal integrated device, includes a hot-air room (1), its characterized in that: the flue gas heat exchanger is characterized in that a shell (7) is fixedly mounted at the top of the support (9), a left smoke chamber (19) is fixedly mounted on the left side of the top of the shell (7), a right smoke chamber (20) is fixedly mounted on the right side of the top of the shell (7), two rows of spiral heat exchange tubes (4) uniformly distributed in the shell (7) are fixedly mounted in the middle of the shell (7), a first flue gas return tube (12) is arranged on the left side of each spiral heat exchange tube (4), a second flue gas return tube (13) is arranged on the right side of each spiral heat exchange tube (4), a first hot air chamber (1), a second hot air chamber (2) and a third hot air chamber (3) penetrating through the shell (7) are fixedly mounted on the outer portion of each spiral heat exchange tube (12) from top to bottom, and a first hot air outlet (10) is fixedly mounted on the left side of the third hot, the outside of flue gas second return pipe (13) has three rooms of hot-air (3), two rooms of hot-air (2), a room of hot-air (1) that run through to casing (7) outside from bottom to top fixed mounting, and the left side fixed mounting of flue gas second return pipe (13) outside hot-air room (1) has second hot-air outlet (11), the bottom fixed mounting of casing (7) has gyration dust removal smoke chamber (8), and the bottom fixed mounting of gyration dust removal smoke chamber (8) has the ash discharge pipe, the inside fixed mounting of ash discharge pipe has second ash discharge valve (15), and the inside fixed mounting of ash discharge pipe has first ash discharge valve (14) that are located second ash discharge valve (15) below, the outside fixed mounting of left side smoke chamber (19) and right smoke chamber (20) has wear-resisting anticorrosive coating (5).
2. The adjustable multi-return-stroke dust removal integrated device for the high-temperature air preheater as claimed in claim 1, wherein: the hot air first chamber (1) and the hot air second chamber (2) and the hot air third chamber (3) outside the smoke first return pipe (12) are fixedly communicated, the top of the smoke first return pipe (12) is fixedly communicated with the left smoke chamber (19), and the bottom of the smoke first return pipe (12) is fixedly communicated with the rotary dust removal smoke chamber (8).
3. The adjustable multi-return-stroke dust removal integrated device for the high-temperature air preheater as claimed in claim 1, wherein: the hot air three-chamber (3), the hot air two-chamber (2) and the hot air one-chamber (1) outside the smoke second return pipe (13) are fixedly communicated, the top of the smoke second return pipe (13) is fixedly communicated with the right smoke chamber (20), and the bottom of the hot air three-chamber (3) outside the smoke second return pipe (13) is fixedly communicated with the rotary dust removal smoke chamber (8).
4. The adjustable multi-return-stroke dust removal integrated device for the high-temperature air preheater as claimed in claim 1, wherein: the right side fixed mounting of right side smoke chamber (20) has the bypass flue, the left side of the outside hot-air room of flue gas first return pipe (12) (1) and the left side fixed mounting of the outside hot-air room of flue gas second return pipe (13) (1) have cold air intake pipe (6), and at the kneck of flue gas first return pipe (12), flue gas second return pipe (13) and left smoke chamber (19), right smoke chamber (20) and gyration dust removal smoke chamber (8) add anticorrosive coating.
5. The adjustable multi-return-stroke dust removal integrated device for the high-temperature air preheater as claimed in claim 1, wherein: the top of gyration dust removal smoke chamber (8) adds and is equipped with dust removal whirl board device, and sets up arc dust fall board around gyration dust removal smoke chamber (8) inside, and has increased anticorrosive coating in gyration dust removal smoke chamber (8) inside.
6. The adjustable multi-return-stroke dust removal integrated device for the high-temperature air preheater as claimed in claim 1, wherein: the inside fixed mounting of left side smoke chamber (19) has adjustable device, and divides movable piece in the adjustable device, divides two sets of each 4 combinations of movable piece outward, the first return stroke pipe of flue gas (12) are low temperature section (17), and flue gas second return stroke pipe (13) are high temperature section (16).
CN201911313194.XA 2019-12-19 2019-12-19 Adjustable multi-return-stroke dust removal integrated device for high-temperature air preheater Withdrawn CN110939942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911313194.XA CN110939942A (en) 2019-12-19 2019-12-19 Adjustable multi-return-stroke dust removal integrated device for high-temperature air preheater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911313194.XA CN110939942A (en) 2019-12-19 2019-12-19 Adjustable multi-return-stroke dust removal integrated device for high-temperature air preheater

Publications (1)

Publication Number Publication Date
CN110939942A true CN110939942A (en) 2020-03-31

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ID=69912054

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Application Number Title Priority Date Filing Date
CN201911313194.XA Withdrawn CN110939942A (en) 2019-12-19 2019-12-19 Adjustable multi-return-stroke dust removal integrated device for high-temperature air preheater

Country Status (1)

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CN (1) CN110939942A (en)

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Application publication date: 20200331