CN113739149B - Low-nitrogen combustor - Google Patents

Low-nitrogen combustor Download PDF

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Publication number
CN113739149B
CN113739149B CN202111095106.0A CN202111095106A CN113739149B CN 113739149 B CN113739149 B CN 113739149B CN 202111095106 A CN202111095106 A CN 202111095106A CN 113739149 B CN113739149 B CN 113739149B
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China
Prior art keywords
air
pipeline
gas
low
shell
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CN202111095106.0A
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CN113739149A (en
Inventor
张艺琳
王�琦
孙公钢
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Foshan Jingye Machinery Manufacturing Co ltd
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China Jiliang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/08—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14003—Special features of gas burners with more than one nozzle

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

Abstract

The invention discloses a low-nitrogen combustor, which comprises a shell, an air pipeline and a gas pipeline which are coaxially arranged, wherein the gas pipeline is a hollow cylindrical pipeline with a closed front end and a boss-shaped tail end, a central air flow channel is formed in the gas pipeline, a plurality of gas spray holes are arranged around the periphery of the boss, and a fluid is arranged in the gas spray holes; the air pipeline is sleeved outside the gas pipeline, the front end of the air pipeline is provided with an air inlet, the tail end of the air pipeline is in a flaring shape, and a plurality of air jet holes are formed around the flaring curved surface; the shell is sleeved outside the air pipeline, the front end of the shell is closed, and the tail end of the shell is communicated with the flaring end of the air pipeline to form a combustion area. The invention provides a low-nitrogen combustor which adopts a mode of combining rotational flow and streaming flow, weakens the influence of a local high-temperature area, constructs a low-speed backflow area, ensures stable and sufficient combustion of fuel and reduces the discharge amount of nitrogen oxides.

Description

Low-nitrogen combustor
Technical Field
The invention belongs to the technical field of gas combustion, and particularly relates to a low-nitrogen combustor.
Background
At present, the coal-to-gas engineering is an important environmental protection engineering greatly popularized by governments, and can greatly reduce CO, SO and dust generated in the coal burning process from the source. The fuel gas is mixed with air and then combusted, and oxygen in the air and hydrocarbon in the fuel gas carry out combustion reaction and release a large amount of heat. However, when the fuel is burned at a high temperature under an excess oxygen condition, nitrogen in the air reacts with oxygen to produce NO X And, under otherwise identical conditions, NO X The amount of production of (c) increases with an increase in the combustion temperature. NO X It is a major environmental hazard and its emissions are generally considered to be associated with ozone reduction and other environmental concerns.
In NO X Prior to widespread concern over environmental impact of emissions, conventional fired furnaces often employed single stage burners which would emit significant amounts of NO X And the requirements of current environmental protection standards and regulations cannot be met. To reduce NO X Emission, low NO needs to be designed X Burners, by rationalStructural design realizes NO on the basis of guaranteeing high-efficient burning X And (4) emission reduction.
Disclosure of Invention
The invention aims to solve the technical defects, and aims to solve the problems of high excess air coefficient, incomplete combustion product generation, unstable combustion and the like during gas combustion and promote a large amount of thermal NO X The low-nitrogen burner is produced.
The invention provides a low-nitrogen combustor which adopts a mode of combining rotational flow and streaming flow, weakens the influence of a local high-temperature area, constructs a low-speed backflow area, ensures stable and sufficient combustion of fuel and reduces the discharge amount of nitrogen oxides.
The invention designs a low-nitrogen burner, which comprises a shell, an air pipeline and a gas pipeline which are coaxially arranged, wherein the gas pipeline is a hollow cylindrical pipeline with a closed front end and a boss-shaped tail end, a central air flow channel is formed in the gas pipeline, a plurality of gas spray holes are arranged around the periphery of the boss, and a fluid is arranged in the gas spray holes; the air pipeline is sleeved outside the gas pipeline, the front end of the air pipeline is provided with an air inlet, the tail end of the air pipeline is in a flaring shape, and a plurality of air jet holes are formed around the flaring curved surface; the shell is sleeved outside the air pipeline, the front end of the shell is closed, and the tail end of the shell is communicated with the flaring end of the air pipeline to form a combustion area.
Further, the central air flow channel comprises an inlet section and an outlet section, the inlet section is a flow channel with a uniform cross-sectional area, and the cross-sectional area of the outlet section is gradually reduced to form a contracted flow channel.
Furthermore, the fluid winding body is in a shuttle shape, the fluid winding body and the gas spray holes are coaxially arranged, a connecting rod penetrates through the fluid winding body, and two ends of the connecting rod are fixedly connected with the hole walls of the gas spray holes respectively.
Further, the fluid is provided with a plurality of threads around the outer surface of the fluid.
Furthermore, a plurality of ring layers are arranged on the flaring curved surface from the center of a circle to the outside, and the air jet holes are distributed on each ring layer.
Furthermore, the air jet holes comprise a first air jet, a second air jet, a third air jet and a fourth air jet, and an axial swirler is arranged in the second air jet.
Further, a sleeve is arranged outside the axial swirler and is vertically and fixedly connected with the inner wall surface of the flaring curved surface.
Further, the axial swirler comprises a plurality of vanes, and a deflection angle is arranged between each vane and the sleeve.
Furthermore, a plurality of fan-shaped saw teeth are arranged on the edge of the flaring curved surface of the air pipeline, and the fan-shaped saw teeth are uniformly distributed along the circumferential direction of the flaring curved surface.
The ignition system is arranged at the front end of the shell and is a high-voltage electric spark ignition device, and the high-voltage ignition package is connected with the air jet hole through a lead.
The beneficial effects of the invention are as follows:
the invention is provided with a plurality of winding fluids to improve the winding effect, and the winding fluids play a certain buffering role in decelerating airflow sprayed at high speed near the winding fluids, thereby having the effect of enhancing steady flow.
The gas jet holes and the air jet holes are all in porous structures, so that the mixing time of fuel and air can be reduced, flame can be reduced, the influence of a local high-temperature area can be weakened, and NO can be inhibited X And (4) generating.
The edge of the outlet end of the air pipeline adopts a zigzag design, the streaming at the boundary of the pipeline is further enhanced, the air and fuel in a combustion area are ensured to react more fully and stably, and NO is further reduced X The amount of discharge of (c).
The invention combines the swirling flow hedging and the streaming flow to quickly and fully mix the fuel and the air, simultaneously entrains combustion products to form a wind-smoke mixture, creates a low-oxygen-concentration combustion atmosphere and inhibits NO X The combustion efficiency and the degree of stability are improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view taken at A-A of FIG. 1 (where axial swirler 222 is not identified);
FIG. 3 is a cross-sectional view taken at B-B of FIG. 1;
FIG. 4 is a schematic view of an axial swirler in the present invention;
FIG. 5 is a schematic view of the structure of the fluid-surrounding body of the present invention;
FIG. 6 is a schematic view of the structure of the fuel gas nozzle hole of the present invention;
FIG. 7 is a schematic illustration of the air flow trajectory within the combustion zone of the present invention.
In the figure: the fuel gas burner comprises a fuel gas pipeline 1, a boss 11, a fuel gas spraying hole 111, a winding fluid 112, a thread 1121, a spherical end 1122, a central air flow channel 12, a fuel gas inlet 13, a connecting rod 14, an air pipeline 2, an air inlet 21, a flared curved surface 22, an air spraying hole 221, a first air spraying port 2211, a second air spraying port 2212, an axial swirler 222, a blade 2221, a sleeve 2222, a third air spraying port 2213, a fourth air spraying port 2214, a sawtooth 223, a shell 3, a combustion area 31, an ignition system 4, an ignition needle 41, an arc 42 and a fire detection needle 43.
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. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
In the description of the present invention, the terms "front end", "left side" and "top" indicate orientations, which are described with reference to the direction of the inlet end of each duct in front view.
The invention described in the embodiment designs a low-nitrogen combustor, the main body of which is composed of three coaxial jet pipes, and each jet pipe is formed by sleeving and welding seamless steel pipes with different diameters.
As shown in fig. 1 to 3, the low-nitrogen burner of the present invention has the following specific structure: a low-nitrogen burner is composed of three coaxial jet tubes, which are welded together by seamless steel tubes with different diameters.
The invention adopts a sleeve type structure, is made of seamless steel tube materials, and comprises a gas pipeline 1, an air pipeline 2, an axial swirler 6, a surrounding fluid 112, a shell 3 and an ignition system 4.
Wherein, the gas pipeline 1 is a hollow cylindrical pipeline with a closed front end and a boss-shaped tail end, and the air pipeline 2 and the shell 3 are sequentially sleeved outwards.
The gas pipeline 1 is internally provided with a central air flow passage 12, the central air flow passage 12 comprises an inlet section and an outlet section, the inlet section is a flow passage with a consistent cross-sectional area, and the cross-sectional area of the outlet section is gradually reduced to form a contraction flow passage.
The top of the gas pipeline 1 near the front end is connected with a gas inlet by screw threads, the section 4mm at the front end of the contraction port is uniformly distributed with porous gas spray holes 111 around the arc surface of the boss 11 along the circumferential direction, and a plurality of fluid windings 112 are arranged in the gas spray holes 111.
The porous gas jet holes 111 are provided with 10 through holes, each diameter is 3.6mm, and the through holes are uniformly distributed along the circumferential direction of the cambered surface of the boss 11.
The air pipeline 2 is sleeved outside the gas pipeline 1, the air pipeline 2 is hollow and the front end is closed, the left side close to the closed front end is connected with an air inlet 21 through a flange, the tail end is in a flaring shape, and four circles of air spray holes 221 are distributed from the center of a circle to the outside at certain intervals around a flaring curved surface 22.
The number and the aperture of the air jet holes 221 in each circle layer are different, the edge of the tail end of the pipeline is designed to be in a sawtooth shape 223, and the shell 3 is coaxially sleeved outside the gas pipeline 1.
The air jet holes 221 are uniformly distributed on the cross sections of the flaring curved surface 22, which are 11mm, 14mm, 18mm and 21.5mm away from the center of the circle, and the parameters of the jet holes from the center of the circle to the outside are 8 phi 4mm (namely the diameter is 4 phi 10mm, the wall thickness is 10mm), 8 phi 3mm, 10 phi 5mm and 10 phi 2mm in sequence.
The housing 3 is sleeved outside the air pipe 2, and the length of the housing 3 is greater than that of the air pipe 2. The casing 3 is closed at the front end and the end communicates with the flared end of the air duct 2 to form a combustion zone 31.
Air injection holes 221 include a first air injection port 2211, a second air injection port 2212, a third air injection port 2213 and a fourth air injection port 2214, and an axial swirler 6 is disposed in second air injection port 2212.
As shown in FIG. 4, the number of the swirl blades 20 of the axial swirler 6 is 6-10, the height of each blade 20 is 2.5-3.5 mm, the length of each blade 20 is 4-6 mm, the deflection angle of each blade 20 is 20-60 degrees, and the swirl flow is along the counterclockwise direction.
In the present invention, the blades 20 are provided in eight pieces, and the deflection angle of the blades 20 is 45 °.
The axial swirl vanes 20 are equidistantly fixed on the central support cylinder, the sleeve 13 of the axial swirler 6 is arranged outside, and two sides of the sleeve 13 are respectively vertical to and fixedly connected with the inner wall surface of the flaring curved surface 22.
Specifically, two ends of the sleeve 13 of the axial swirler 6 are vertically and fixedly connected with the inner walls of the flaring curved surfaces 22 at two sides of the 10 × Φ 5mm air injection holes 221.
As shown in fig. 5 to 6, the fluid winding 112 is in a shuttle shape, the fluid winding 112 is disposed at the outlet of the gas spraying hole 111, the fluid winding 112 and the gas spraying hole 111 are coaxially disposed, wherein the spherical end 1122 of the fluid winding 112 is disposed parallel to the sidewall of the boss 11, a connecting rod 14 penetrates the fluid winding 112, the connecting rod 14 is disposed perpendicular to the fluid winding 112, two ends of the connecting rod 14 are respectively fixedly connected to the hole walls of the gas spraying hole 111, and the connecting rod 14 is fixedly connected to the fluid winding 112, and the above-mentioned fixed connections can be achieved by welding and the like.
The fluid enclosure 112, also called a bluff body, i.e. a non-linear fluid, has a large pressure difference resistance due to its shape characteristics, so that the fluid can form flow separation when flowing through the boundary of the fluid enclosure 112, and a broad wake can be generated at the rear part, and the periodic or non-periodic vortex shedding phenomenon is accompanied. Therefore, the fluid 112 can perform a deceleration function, and the fluid will form a low-speed recirculation zone at the tail of the fluid 112 after passing through the fluid.
The maximum arc diameter of the winding fluid 112 is 2.34mm, so that the winding effect is better, the spherical radius of two ends is 0.1mm, a certain buffer effect is realized on the deceleration of the high-speed jet airflow near the winding fluid, and the steady flow effect is enhanced. The radius of the chamfer at the two ends is 0.1mm, and the total length of the axial diameter of the streaming is 3.57 mm.
A plurality of thread lines 1121 are arranged around the outer surface of the fluid 112, specifically, 12 turns of spiral lines are axially arranged on the outer surface, and circular arc threads with the diameter of 0.3mm and the depth of 0.14mm are cut along the spiral lines. The end surfaces of two sides are respectively fixed on the two side wall surfaces inside the gas nozzle.
The edge of the flaring curved surface 22 of the air pipeline 2 is provided with a plurality of fan-shaped sawteeth 223, and the fan-shaped sawteeth 223 are uniformly distributed along the circumferential direction of the flaring curved surface 22.
Specifically, the central angle of the sector-shaped sawtooth 223 is 91 degrees, the arc length is 39.7mm, the cutting thickness is 5mm, and ten sector-shaped sawteeth are uniformly arranged along the circumferential direction.
The invention also comprises an ignition system 4, the ignition system 4 is arranged outside the front end of the shell 3, the ignition system 4 is a high-voltage electric spark ignition device, and a high-voltage ignition package is connected with an ignition needle 41, a discharge arc 42 and a fire detection needle 43 on the air jet hole 221 through lead wires.
The inside welded structure that adopts of whole combustor guarantees the leakproofness between each passageway.
When the low-nitrogen combustor is used, the gas circulation process is as follows: the fuel gas enters the fuel gas pipeline 1 through the connecting fuel gas inlet 13, flows to the contraction part of the boss 11 of the outlet section along the central air flow passage 12, is accelerated by the contraction flow passage, is sprayed into the combustion area 31 from the tail end fuel gas spray hole 111 through the winding fluid 112, and forms a central backflow area after the winding fluid 112 due to the winding flow.
The air circulation process comprises the following steps: after the air enters the air pipe 2 from the air inlet 21 and flows to the air injection holes 221 at the flaring curved surface 22 through the connection, the air passing through the second air injection port 2212 forms a rotating airflow by the axial swirler 6, and at the boundary outlet of the air pipe 2, the fan-shaped sawteeth 223 and the surrounding uncut area jointly generate a streaming action to form a local low-speed flow area at the boundary.
As shown in fig. 7, in the present invention, the fuel gas is accelerated by the contracted flow channel and flows through the fluid 112 at a certain angle, and the spiral 1121 on the surface of the fluid 112 makes the fuel gas generate a certain angle of rotation to form a small-amplitude rotational flow, and a weak negative pressure is generated to slow down the flow rate of the fuel gas; the combined flow around acts on the flow around body 112 to form a low-speed backflow zone, and the fuel in the central backflow zone is over-concentrated; the fuel in the area far away from the outlet of the fuel gas pipeline is too light, and a stable thick and light combustion area is formed integrally. On one hand, the central backflow zone can slow down the gas injection speed and meet the flow condition of stable flame, and on the other hand, the rotational flow promotes the high-temperature gas and the high-concentration fuel to fully perform energy and quality exchange to form a stable ignition source so as to ensure stable combustion and reduce the NOx emission while ensuring stable combustion; the fan-shaped sawtooth 223-shaped boundary further enhances air circumfluence at the outlet edge of the pipeline, stabilizes the boundary flow field, promotes fuel to be fully and stably combusted, and further inhibits the generation amount of NOx.
In another embodiment:
the reduction of NOx emission by merely stabilizing the flow field by the bypass flow is very limited, and the problems of fuel burn-out rate and local high temperature area generated during combustion should be taken into consideration.
In the embodiment, an axial swirler 6 is arranged at the outlet of an air jet hole 221 with the diameter of 10 × Φ 5mm, air firstly enters the flaring curved surface 22 of the air pipeline 2, and enters the combustion area 31 through the axial swirler 6 to form airflow rotating at a high speed, so that negative pressure is generated, smoke is sucked, the mixing degree with fuel is enhanced, meanwhile, a local high-temperature area generated in the combustion process is weakened, and the generation of NOx is inhibited.
The other portions are the same as in example 1.
The present description is not set forth in detail in order to not unnecessarily obscure the present invention.
The invention adopts a mode of combining rotational flow and circumfluence, weakens the influence of local high-temperature areas, constructs a low-speed backflow area, ensures the stable and sufficient combustion of fuel, and reduces the discharge amount of nitrogen oxides to be less than or equal to 30mg/Nm 3.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.

Claims (6)

1. A low-nitrogen burner, characterized by: the gas pipeline is a hollow cylindrical pipeline with a closed front end and a boss-shaped tail end, a central air flow channel is formed inside the gas pipeline, a plurality of gas spray holes are formed around the circumferential surface of the boss, and a fluid is arranged in each gas spray hole; the air pipeline is sleeved outside the gas pipeline, the front end of the air pipeline is provided with an air inlet, the tail end of the air pipeline is in a flaring shape, and a plurality of air jet holes are formed around the flaring curved surface; the shell is sleeved outside the air pipeline, the front end of the shell is closed, and the tail end of the shell is communicated with the flaring end of the air pipeline to form a combustion area;
the central air flow passage comprises an inlet section and an outlet section, and the cross sectional area from the inlet section to the outlet section is gradually reduced to form a contraction flow passage;
the fluid winding body is in a shuttle shape and is coaxially arranged with the gas jet hole, a connecting rod penetrates through the fluid winding body, and two ends of the connecting rod are fixedly connected with the hole wall of the gas jet hole respectively;
a plurality of thread lines are arranged on the outer surface of the winding body;
the flaring curved surface is provided with a plurality of ring layers from the center of a circle to the outside, and the air jet holes are distributed on each ring layer.
2. The low-nitrogen burner of claim 1, wherein the air jet holes comprise a first air jet, a second air jet, a third air jet and a fourth air jet, and an axial swirler is disposed within the second air jet.
3. The low-nitrogen combustor according to claim 2, wherein a sleeve is arranged outside the axial swirler and is perpendicular to and fixedly connected with the inner wall surface of the flared curved surface.
4. The low-nitrogen burner of claim 3, wherein the axial swirler includes a plurality of vanes, and a deflection angle is provided between the vanes and the shroud.
5. The low-nitrogen burner of claim 1, wherein the flared curved edge of the air pipe is provided with a plurality of scalloped serrations evenly distributed along a circumferential direction of the flared curved surface.
6. The low-nitrogen burner of claim 1, further comprising an ignition system, wherein the ignition system is arranged at the front end of the shell, the ignition system is a high-voltage electric spark ignition device, and a high-voltage ignition pack is connected with the air jet hole through a lead.
CN202111095106.0A 2021-09-17 2021-09-17 Low-nitrogen combustor Active CN113739149B (en)

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CN113739149B true CN113739149B (en) 2022-09-20

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20110373A1 (en) * 2011-11-24 2013-05-25 Ln 2 Srl Socio Unico AIR-GAS MIXER DEVICE FOR COMBUSTIBLE GAS BURNERS WITH PRE-MIXING
CN104613473B (en) * 2015-01-30 2017-11-10 中国东方电气集团有限公司 A kind of porous gas jet burner
CN206669733U (en) * 2017-03-06 2017-11-24 上海岱鼎工业设备有限公司 A kind of wind fires super blender
CN107461835A (en) * 2017-08-30 2017-12-12 广东顺威精密塑料股份有限公司 The air outlet grate of outdoor machine of air-conditioner
CN209672325U (en) * 2019-03-26 2019-11-22 李卫红 A kind of truncated cone-shaped cloth wind low nitrogen burning head
CN210951304U (en) * 2019-09-16 2020-07-07 浙江力聚热水机有限公司 Ultra-low nitrogen premixed gas burner
CN111520717B (en) * 2020-04-09 2024-06-07 华侨大学 Hierarchical low nitrogen gas burner based on whirl
CN113375153A (en) * 2021-07-13 2021-09-10 深圳市佳运通电子有限公司 Universal low-nitrogen burner nozzle structure

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Inventor after: Zhang Yilin

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Inventor after: Sun Gonggang

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Address after: 528100, Block 9, 101, No. 7 Jinxiang Road North, Southwest Street, Sanshui District, Foshan City, Guangdong Province (Residence Declaration)

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