阅读说明：本技术 一种分体式热风型低氮燃气燃烧器 (Split type hot-blast type low-nitrogen gas burner ) 是由 林勇 李顺荣 孙玉东 于 2020-07-13 设计创作，主要内容包括：本发明是一种分体式热风型低氮燃气燃烧器,包括燃烧器壳体、火焰筒、中心气管总成、点火枪组件和风门调节机构总成,在燃烧器壳体的内壁上设有保温结构,火焰筒安装在所述燃烧器壳体的前端,火焰筒的内部与燃烧器壳体的内部相互贯通,点火枪组件与中心气管总成固定连接在一起形成一个整体安装在燃烧器壳体的内部,其前端向所述火焰筒的前端延伸,风门调节机构总成通过三通管组件安装在燃烧器壳体上的风机进风口处。有益效果：本发明燃烧器从外观结构上与风机机构分开设置,通过安装风门调节机构总成与外部风机连接,实现烟气外循环,减少过量空气量有利于减少NO<Sub>X</Sub>的生成；其结构更简单,在满足国家排放标准的情况下实用性强。(The invention relates to a split hot-air type low-nitrogen gas burner which comprises a burner shell, a flame tube, a central air pipe assembly, an ignition gun assembly and an air door adjusting mechanism assembly, wherein a heat insulation structure is arranged on the inner wall of the burner shell, the flame tube is arranged at the front end of the burner shell, the interior of the flame tube is communicated with the interior of the burner shell, the ignition gun assembly and the central air pipe assembly are fixedly connected together to form a whole body which is arranged in the burner shell, the front end of the ignition gun assembly extends to the front end of the flame tube, and the air door adjusting mechanism assembly is arranged on the burner shell through a three-way pipe assemblyThe fan air inlet department. Has the advantages that: the combustor is separated from the fan mechanism from the appearance structure, and is connected with an external fan by installing the air door adjusting mechanism assembly, so that the external circulation of flue gas is realized, the excessive air quantity is reduced, and the reduction of NO is facilitated X Generating; the structure is simpler, and the practicability is strong under the condition of meeting the national emission standard.)

1. The utility model provides a low nitrogen gas burner of split type hot-blast type, its characterized in that, includes combustor casing, flame tube, central trachea assembly, burning torch subassembly and air door adjustment mechanism assembly be equipped with insulation construction on the inner wall of combustor casing, the flame tube is installed the front end of combustor casing, the inside of flame tube with the inside of combustor casing link up each other, the burning torch subassembly forms a monolithic mounting together with central trachea assembly fixed connection in the inside of combustor casing, its front end to the front end of flame tube extends, air door adjustment mechanism assembly passes through the tee bend pipe subassembly and installs fan air inlet department on the combustor casing.

2. The split hot-blast type low-nitrogen gas burner as claimed in claim 1, wherein the heat-insulating structure comprises a heat-insulating plate and heat-insulating cotton with a thickness of 28-32mm, the heat-insulating cotton is attached to the inner wall of the burner housing, and the heat-insulating plate is fixed on the outer surface of the heat-insulating cotton.

3. The split hot-air type low-nitrogen gas burner as claimed in claim 1, wherein the central gas pipe assembly comprises a gas inlet pipe, a cylindrical gas distributor, a plurality of gas distribution branch pipes, a gas distribution main pipe, a flame stabilizing disc and a swirler, the gas inlet pipe extends from the bottom of the burner housing, the upper end of the gas inlet pipe is communicated with the gas distributor to convey gas into the gas distributor, the top of the gas distributor is fixed with the burner housing through a connecting shaft and a set screw, the plurality of gas distribution branch pipes are connected to the periphery of the front part of the gas distributor at equal intervals and are communicated with the inside of the gas distributor, a gas nozzle is installed at the front end of each gas distribution branch pipe, a plurality of gas spray holes are formed in the gas nozzle, and the gas distribution main pipe is communicated with the center of the front end of the gas distributor, the gas distribution is responsible for the periphery of the front end of the pipe equidistance and is equipped with a plurality of venthole, the gas distribution branch pipe all to with the gas distribution is responsible for the front end of flame tube extends, the flame stabilizing disc is installed on the front end of being responsible for is responsible for in the gas distribution, and is located the inboard of venthole, the swirler cover is established on the gas distribution is responsible for the front end, its periphery butt is at a plurality of root the inboard of gas distribution branch pipe, the end of ignition rifle subassembly through first fixed bolster with gas distributor fixed connection, its front end to swirler department extends to be responsible for the second fixed bolster through the second with gas distribution fixed connection the front end of ignition rifle subassembly is equipped with the flame dispersion orifice plate, the flame dispersion orifice plate is installed on the swirler.

4. The split hot-blast type low-nitrogen gas burner as claimed in claim 3, wherein the combustion flame is divided into three zones at the front end of the central gas pipe assembly, one zone is a central flame zone of one layer formed at the flame stabilizing disc, two zones are central flame zones of two layers formed at the swirler, and the third zone is an outer flame zone formed between the flame tube and the swirler.

5. The split hot-air type low-nitrogen gas burner as claimed in claim 3, wherein the swirler comprises an inner ring disc and an outer ring disc, the inner ring disc and the outer ring disc are coaxially arranged, a plurality of swirling sheets are obliquely arranged between the inner ring disc and the outer ring disc, the swirling sheets are equidistantly arranged to form a ring shape, and the inclination angles of the swirling sheets are 25 °.

6. The split hot-blast low-nitrogen gas burner as claimed in claim 3, wherein the gas burner head includes a cylindrical jet part, the gas nozzles are distributed on a pipe wall of the jet part and on a front end surface of the jet part, the front end surface of the jet part has a plane end surface and a downwardly inclined end surface, five gas nozzles are distributed on the plane end surface and the inclined end surface, and the jet nozzle is further installed on the gas burner head facing the direction of the swirler.

7. The split hot-blast low-nitrogen gas burner as claimed in claim 1, the air door adjusting mechanism assembly comprises an air door frame, an air door plate, a driving air door shaft, a plurality of driven air door shafts and a servo adjusting motor, the wind door frame is arranged on the three-way pipe assembly, the wind door plate is arranged on the wind door frame, the driving air door shaft and the driven air door shafts are sequentially and equidistantly arranged on the air door plate, two ends of the driving air door shaft and the driven air door shaft are fixed on two side surfaces of the air door frame through diamond-shaped bearings, the servo adjusting motor is arranged on the side surface of the wind door frame through a servo adjusting motor bracket, the output shaft of the servo adjusting motor is connected with one end of the driving air door shaft through a coupler, the other end of the driving air door shaft is connected with one end of the driven air door shaft through an air adjusting rod and a connecting rod.

8. The split hot-air type low-nitrogen gas burner as claimed in claim 7, wherein there are three driven air door shafts, namely a first driven air door shaft, a second driven air door shaft and a third driven air door shaft, the driving air door shaft is connected with the third driven air door shaft and the second driven air door shaft, and the third driven air door shaft is connected with the first driven air door shaft.

Technical Field

The invention relates to the technical field of burners, in particular to a split hot air type low-nitrogen gas burner.

Background

With the rapid development of societySome industrial manufacturers, especially manufacturers using heat-conducting oil furnaces, can only use air to exchange heat instead of water, so that hot air type burners are produced; the structure and the working principle of the existing hot air type burner are relatively single at present, and the requirement that new smoke emission standards are not provided at the present stage is met, such as: nitrogen oxides NO_X、CO、SO₂And the emission requirements are met. The new flue gas emission standard reduces the smoke concentration, CO and NO_X、SO₂The emission of the boiler tail gas NO is required by local standards such as Beijing, Hebei and the like_XLess than 30 mg; as the local standards of Shanghai, Jiangsu, Zhejiang and the like, the requirement of NO in boiler tail gas_XLess than 50 mg. Due to the increase of emission requirements and the large application of various fuel gases by national policies, the development of a split hot-air type low-nitrogen burner is an urgent need for energy conservation and environmental protection.

A mixing head in the hot air type low-nitrogen gas burner is a key core component of the hot air type low-nitrogen gas burner.

At present, in the domestic and foreign burner industry, the diffusion type combustion is adopted as the combustion mode, and in order to ensure the sufficient combustion of the fuel, the design idea of better mixing of the fuel and air is generally adopted, and the combustion mode has the advantages of more concentrated flame, high flame temperature and easy generation of NO_X. Thermal type NO with increasing temperature_XThe generation amount of (c) increases by geometric multiple law. To solve the problem of reducing NO of the burner_XThe problem of the combustor which needs to satisfy the national and local standards and ensure the sufficient combustion of the fuel and the little change of the boiler thermal efficiency is urgently needed to be solved by global technicians.

Disclosure of Invention

The invention aims to solve the technical problem of providing a split hot air type low-nitrogen gas burner.

The technical scheme is as follows,

as a further improvement, a low nitrogen gas burner of split type hot-blast type, its characterized in that includes combustor casing, flame tube, central trachea assembly, burning torch subassembly and air door adjustment mechanism assembly be equipped with insulation construction on the inner wall of combustor casing, the flame tube is installed the front end of combustor casing, the inside of flame tube with the inside of combustor casing link up each other, burning torch subassembly and central trachea assembly fixed connection form a monolithic installation together in the inside of combustor casing, its front end to the front end of flame tube extends, air door adjustment mechanism assembly passes through the tee bend pipe subassembly and installs fan air inlet department on the combustor casing.

As a further improvement, the heat insulation structure comprises a heat insulation plate and heat insulation cotton with the thickness of 28-32mm, the heat insulation plate is attached to the inner wall of the combustor shell, and the heat insulation plate is fixed on the outer surface of the heat insulation plate.

As a further improvement, the central gas pipe assembly comprises a gas inlet pipe, a cylindrical gas distributor, a plurality of gas distribution branch pipes, a gas distribution main pipe, a flame stabilizing disc and a swirler, the gas inlet pipe extends from the bottom of the burner shell, the upper end of the gas inlet pipe is communicated with the gas distributor to convey gas in the gas distributor, the top of the gas distributor is fixed with the burner shell through a connecting shaft and a set screw, the plurality of gas distribution branch pipes are equidistantly connected to the periphery of the front part of the gas distributor and communicated with the inside of the gas distributor, a gas nozzle is mounted at the front end of each gas distribution branch pipe, a plurality of gas spray holes are arranged on the gas nozzle, the gas distribution main pipe is communicated with the center of the front end of the gas distributor, and a plurality of gas outlet holes are equidistantly arranged on the periphery of the front end of the gas distribution main pipe, the front end that gas distribution branch pipe and gas distribution were responsible for all to the front end of flame tube extends, the flame stabilizing disc is installed on the front end that the gas distribution was responsible for, and is located the inboard of venthole, the swirler cover is established on the front end that the gas distribution was responsible for, its periphery butt is at a plurality of root the inboard of gas distribution branch pipe, the end of ignition rifle subassembly through first fixed bolster with gas distributor fixed connection, its front end to swirler department extends to through the second fixed bolster with gas distribution is responsible for fixed connection the front end of ignition rifle subassembly is equipped with the flame dispersion orifice plate, the flame dispersion orifice plate is installed on the swirler.

As a further improvement, the front end of the central air pipe assembly divides the combustion flame into three areas, wherein one area is a central flame area of one layer formed at the flame stabilizing disc, the second area is a central flame area of two layers formed at the swirler, and the third area is an outer flame area formed between the flame tube and the swirler.

As a further improvement, the cyclone comprises an inner ring disc and an outer ring disc, the inner ring disc and the outer ring disc are coaxially arranged, a plurality of cyclone plates are obliquely arranged between the inner ring disc and the outer ring disc, the plurality of cyclone plates are equidistantly enclosed to form an annular shape, and the inclination angles of the plurality of cyclone plates are 25 degrees.

As a further improvement, the gas nozzle comprises a cylindrical injection part, the gas spray holes are distributed on the pipe wall of the injection part and the front end face of the injection part, the front end face of the injection part is composed of a plane end face and a downward inclined end face, five gas spray holes are distributed on the plane end face and the inclined end face, and an injection nozzle is further mounted on the gas nozzle facing the direction of the swirler.

As a further improvement, the air door adjustment mechanism assembly includes air door frame, air door board, a initiative air door axle, a plurality of driven air door axles and servo regulation motor, the air door frame is installed on the tee bend pipe subassembly, the air door board is installed on the air door frame, a initiative air door axle and a plurality of driven air door axles in proper order equidistance arrange on the air door board, the both ends of initiative air door axle and driven air door axle are passed through the rhombus bearing and are fixed on the both sides face of air door frame, servo regulation motor passes through servo regulation motor support mounting on the side of air door frame, servo regulation motor's output shaft pass through the shaft coupling with the one end of initiative air door axle is connected, the other end of initiative air door axle pass through air adjusting rod and connecting rod with the one end of driven air door axle is connected.

As a further improvement, the number of the driven air door shafts is three, the driven air door shafts are respectively a first driven air door shaft, a second driven air door shaft and a third driven air door shaft, the driving air door shaft is connected with the third driven air door shaft and the second driven air door shaft, and the third driven air door shaft is connected with the first driven air door shaft.

Advantageous effects

The beneficial effects are that: the combustor is separated from the fan mechanism from the appearance structure, and is connected with an external fan by installing the air door adjusting mechanism assembly, so that the external circulation of flue gas is realized, the excessive air quantity is reduced, and the reduction of NO is facilitated_XGenerating; the independent combustor shell is designed, so that the structure is simpler, the layout is more reasonable, and the practicability is higher under the condition of meeting the national emission standard; the central air pipe assembly divides combustion flame into three areas by structural design, layered combustion is carried out, a multi-flame distribution state is formed in the flame form, the temperature of the flame root is effectively reduced, the temperature of the whole flame tends to be in a uniform distribution state, and air and fuel can be mixed most effectively and timely through the accurate design of a mixed central air path, so that the combustion process can operate under the condition of theoretical air quantity as much as possible; this is the most direct and effective reduction of NO_XA method of venting; reducing excessive oxygen in flue gas, and inhibiting NO_XIs the most direct and effective reduction of NO_XA method of venting.

Drawings

The invention is further explained with the embodiment in the following.

FIG. 1 is a side cross-sectional structural schematic view of the present invention;

FIG. 2 is a schematic top cross-sectional view of the present invention;

FIG. 3 is a schematic view of the damper adjustment mechanism assembly mounting structure of the present invention

FIG. 4 is a schematic front view of the damper adjustment structure of the present invention;

FIG. 5 is a side elevational view of the damper adjustment structure of the present invention;

FIG. 6 is a first schematic structural view of the central air tube assembly of the present invention;

FIG. 7 is a second schematic structural view of the central air tube assembly of the present invention;

fig. 8 is a partially enlarged view of the portion C of fig. 7.

Reference numbers in the figures:

1. burner housing 2, flame tube

3. Central air pipe assembly 301 and fuel gas inlet pipe

302. Gas distributor 303 and gas distribution branch pipe

304. Gas distribution main pipe 305 and flame stabilizing disc

306. Swirler 3061, inner ring dish

3062. Outer ring disc 3063, spinning disk

307. Gas nozzle 3071 and injection part

3072. Plane end face 3073 and inclined end face

3074. Injection nozzle 308 and gas injection hole

309. Air outlet 310 and sealing gasket

4. Air door adjusting mechanism assembly 401 and air door frame

402. Air door plate 403 and active air door shaft

404. First driven air door shaft 405, second driven air door shaft

406. Third driven throttle shaft 407 and servo regulation motor

408. Servo adjusting motor bracket 409 and diamond-shaped bearing

410. Shaft coupling 411, air adjusting rod

412. Connecting rod 5, heat insulation board

6. Heat insulation cotton 7 and three-way pipe assembly

8. Smoke circulation butterfly valve assembly 9 and flame detector

10. Fire detection mounting seat assembly 11 and copper ball valve

12. Ignition transformer assembly 13 and gas butterfly valve assembly

14. Combustor transfer control box 15 and wind pressure switch

16. High-voltage stable plug 17 and ignition gun assembly

18. Bypass ignition metal hose 19, bypass gas joint

20. Flame dispersion orifice plate 21, set screw

22. Connecting shaft

Detailed Description

So that the manner in which the above recited features of the present invention can be understood and readily understood, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings, wherein:

as shown in fig. 1-2, a split hot-air low-nitrogen gas burner comprises a burner housing 1, a flame tube 2, a central air pipe assembly 3, an ignition gun assembly 17 and an air door adjusting mechanism assembly 4. The inner wall of the combustor shell 1 is provided with a heat insulation structure, the heat insulation structure comprises a heat insulation board 5 and heat insulation cotton 6 with the thickness of 28-32mm, the heat insulation board is generally preferably 30mm, the heat insulation board 6 is attached to the inner wall of the combustor shell 1, and the heat insulation board 5 is fixed on the outer surface of the heat insulation board 6 and plays a role in heat insulation and heat preservation for the interior of the combustor shell. The flame tube 2 is arranged at the front end of the burner shell 1, the inner part of the flame tube 2 is communicated with the inner part of the burner shell 1, the ignition gun component 17 is fixedly connected with the central air pipe assembly 3 to form a whole body which is arranged in the burner shell 1, the front end of the ignition gun component extends to the front end of the flame tube 2, and the air door adjusting mechanism assembly 4 is arranged at the air inlet of the fan on the burner shell 1 through the three-way pipe component 7. The three-way pipe component 7 is also connected with an external smoke circulating system through a smoke circulating butterfly valve component 8 for adjusting and controlling the smoke circulating quantity, thereby being beneficial to reducing NO_XAnd (4) generating. In order to ensure that the equipment can work normally and safely, a flame detector 9, a copper ball valve 11, an ignition transformer assembly 12, a gas butterfly valve assembly 13 and the middle of the combustor are arranged on the combustor shellThe flame detector 9 is fixed on the burner shell 1 through a fire detection mounting seat assembly 10 and screws, and a copper ball valve 11 is fixed on the fire detection mounting seat assembly 10 through G1/4 standard alignment wires and connected with compressed air provided by a user, so that the functions of cooling, maintaining and cleaning the flame detector 9 are achieved; the ignition transformer component 12 is fixedly arranged below the combustor shell 1 through screws, the gas butterfly valve component 13 is fixedly arranged on a gas inlet pipe through screws, the combustor transfer control box 14 is fixedly arranged on one side of the combustor shell through screws and used for carrying the butt joint of a circuit of the combustor and a control box of the combustor, the wind pressure switch 15 is fixedly arranged on one side of the combustor shell 1 through a standard G1/4 butt joint wire, a set value of the wind pressure switch is given to protect safe and normal operation, one end of a high-pressure stabilizing plug 16 is connected with an ignition gun group 17, the other end of the high-pressure stabilizing plug is connected with the ignition transformer component 12 through a high-pressure wire, one end of a bypass ignition metal hose 18 is connected with the ignition gun component, the other end of the bypass ignition metal hose is fixed on a bypass gas joint 19, and the bypass gas joint 19 is fixedly arranged on the combustor shell.

As shown in fig. 6-8, the central gas pipe assembly 3 includes a gas inlet pipe 301, a cylindrical gas distributor 302, a plurality of gas distribution branch pipes 303, a gas distribution main pipe 304, a flame stabilizing disc 305 and a swirler 306, the gas inlet pipe 301 extends from the bottom of the burner housing 1, the upper end of the gas inlet pipe is communicated with the gas distributor 302 to convey gas into the gas distributor 302, the gas inlet pipe 301 is hermetically connected with the burner housing 1 through a sealing gasket 310, the top of the gas distributor 302 is fixed with the burner housing 1 through a connecting shaft 22 and a set screw 21, the plurality of gas distribution branch pipes 303 are connected to the periphery of the front portion of the gas distributor 302 at equal intervals and are communicated with the inside of the gas distributor 302, a gas nozzle 307 is installed at the front end of each gas distribution branch pipe 303, a plurality of gas nozzles 308 are arranged on the gas nozzle 307, the gas distribution main pipe 304 is communicated with the center of the front end of the gas distributor, a plurality of gas outlets 309 are equidistantly arranged on the periphery of the front end of the gas distribution main pipe 304, and the gas distribution main pipe is provided with a plurality of gas outletsThe front ends of the branch distribution pipes 303 and the main gas distribution pipe 304 extend to the front end of the flame tube 2, the flame stabilizing disc 305 is installed at the front end of the main gas distribution pipe 304 and is positioned at the inner side of the air outlet 308, the swirler 306 is sleeved at the front end of the main gas distribution pipe 304, the periphery of the swirler 306 abuts against the inner sides of the plurality of main gas distribution pipes 303, the tail end of the ignition gun assembly 17 is fixedly connected with the gas distributor 302 through a first fixing support, the front end of the ignition gun assembly extends to the swirler 306 and is fixedly connected with the main gas distribution pipe 304 through a second fixing support, the flame dispersion orifice plate 20 is arranged at the front end of the ignition gun assembly 17, the flame dispersion orifice plate 20 is installed on the swirler 306, and the flame dispersion orifice plate 20 plays a role in fully mixing natural gas and air sprayed by the shunt ignition gun, so that the bypass ignition success rate reaches 100. The gas nozzle 307 comprises a cylindrical injection part 3071, gas spray holes 308 are distributed on the pipe wall of the injection part 3071 and the front end face of the injection part 3071, the front end face of the injection part 3071 is composed of a plane end face 3072 and a downward inclined end face 3073, five gas spray holes are distributed on the plane end face 3072 and the inclined end face 3073, and an injection nozzle 3074 is also arranged on the gas nozzle 307 facing the direction of the swirler 306 so as to divide the gas into multiple directions and multiple angles for injection, thereby leading the gas to be fully combusted and reducing NO_XAnd (4) generating. The swirler 306 comprises an inner ring disc 3061 and an outer ring disc 3062, the inner ring disc 3061 and the outer ring disc 3062 are coaxially arranged, a plurality of swirl plates 3063 are obliquely arranged between the inner ring disc 3061 and the outer ring disc 3062, the swirl plates 3063 surround into a ring shape at equal intervals, the inclination angles of the swirl plates are 25 degrees, the swirl value is 1.6-2.2 degrees, the swirl speed is 20-40 m/s, natural gas sprayed from the spray nozzle 3074 is fully mixed at the wind speed of 35.7m/s and the swirl angle of 25 degrees, the natural gas and the air are completely combusted after being ignited by a bypass, the temperature of a central fire field is low, and therefore the nitrogen oxide NO is effectively reduced_XThe cyclone with the structure can adjust the length of flame, thereby being suitable for various hearths.

The front end of the central air pipe assembly divides combustion flame into three areas, wherein one area is a layer of central flame area formed at the position of the flame stabilizing disc, the second area is a layer of central flame area formed at the position of the swirler, the third area is an external flame area formed between the flame tube and the swirler, and a multi-flame distribution state is formed in the flame form, so that the temperature of the flame root is effectively reduced, and the temperature of the whole flame is uniformly distributed.

As shown in fig. 3-5, the air door adjusting mechanism assembly 4 includes an air door frame 401, an air door plate 402, a driving air door shaft 403, a plurality of driven air door shafts and a servo adjusting motor 407, the air door frame 401 is installed on the three-way pipe assembly 7, the air door plate 402 is installed on the air door frame 401, the driving air door shaft 403 and the driven air door shafts are sequentially and equidistantly arranged on the air door plate 402, two ends of the driving air door shaft 403 and the driven air door shafts are fixed on two side surfaces of the air door frame 401 through diamond-shaped bearings 409, the servo adjusting motor 407 is installed on a side surface of the air door frame 401 through a servo adjusting motor support 408, an output shaft of the servo adjusting motor 407 is connected with one end of the driving air door shaft 403 through a coupler 410, and the other end of the driving air door shaft 403 is connected with one end of the driven air door shaft through an air adjusting rod 411 and. The air door plate is controlled to be in a horizontal position through the length of the fine adjustment air adjusting rod, and meanwhile, the air door is guaranteed to rotate freely without being blocked. The number of the driven air door shafts is three, namely a first driven air door shaft 404, a second driven air door shaft 405 and a third driven air door shaft 406, the driving air door shaft 403 is connected with the third driven air door shaft 406 and the second driven air door shaft 405, and the third driven air door shaft 406 is connected with the first driven air door shaft 404. Through the mode that servo motor and initiative throttle axle are directly allied oneself with, the aperture of accurate control air door reduces the excessive oxygen in the flue gas among the combustion process to restrain NO_XAnd (4) generating.

In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the invention, and all equivalent changes and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.