CN219120555U

CN219120555U - Hot-air type low-nitrogen FGR combustor

Info

Publication number: CN219120555U
Application number: CN202222216901.7U
Authority: CN
Inventors: 周鹏飞
Original assignee: Wuxi Pannonio Industrial Equipment Co ltd
Current assignee: Wuxi Pannonio Industrial Equipment Co ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2023-06-02
Anticipated expiration: 2032-08-23

Abstract

The utility model provides a hot air type low-nitrogen FGR (flue gas desulfurization) burner, relates to the technical field of burners, and aims to solve the problems that the ratio of primary fuel gas and primary combustion air in total air flow of the existing burner is fixed and not adjustable, flame turbulence is easy to cause to influence the operation of the burner, and the emission of nitrogen oxides exceeds the standard and pollutes the environment. The novel burner comprises a burner shell, a combustion head is arranged at the front end of the burner shell, the burner shell adopts an outer shell, a middle filler and an inner shell, the outer edge of the inner cylinder is regulated to enable air flow to be sprayed out to form a vacuum area to realize internal circulation of smoke, combustible components which are not combusted fully in the smoke are further combusted, nitrogen oxides are further reduced, part of smoke is recycled by FGR technology to be combusted in a hearth again, the emission of nitrogen oxides is further reduced, the national environmental protection requirements can be met, and the development of enterprises is promoted.

Description

Hot-air type low-nitrogen FGR combustor

Technical Field

The utility model relates to the technical field of burners, in particular to a hot air type low-nitrogen FGR burner.

Background

The hot air type low nitrogen FGR burner means that the combustion air required for the burner is high temperature air, and some are heated to even 250 degrees celsius. Because the burner is an electromechanical integrated device, some electrical elements in the burner need to be subjected to heat-resistant treatment, so that the safety of operators is ensured for preventing scalding, and the temperature of the outer surface is not allowed to exceed 50 ℃. The efficiency of the secondary heat exchange device changes along with the change of the boiler load, so that the temperature of the combustion air fluctuates, and the density and the oxygen content of the air change along with the change of the air temperature, so that the burner is required to timely adjust the air quantity entering the hearth for combustion according to the change of the temperature.

The ratio of primary fuel gas and primary combustion air in the total air flow of the existing burner is fixed and not adjustable, flame turbulence is easy to cause to influence the operation of the burner, and the problems of exceeding of emission of nitrogen oxides and environmental pollution are caused, so that the design of the hot air type low-nitrogen FGR burner is particularly important.

Disclosure of Invention

The utility model aims to solve the problems that in the prior art, the ratio of primary fuel gas and primary combustion air in total air flow of a burner is fixed and not adjustable, flame turbulence is easy to cause to influence the operation of the burner, and the emission of nitrogen oxides exceeds standard and pollutes the environment.

In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a low nitrogen FGR combustor of hot-blast formula, includes the combustor casing, the combustion head is installed to the front end of combustor casing, the combustor casing adopts outer casing, middle level filler and the three-layer design of inlayer casing, the combustor casing is cavity link up, air door adjustment mechanism is installed to the bottom of combustor casing, the combustion head with pass through rotatory flange connection between the combustor casing, the combustion head is including adjusting the urceolus, adjust the urceolus and pass through fastener fixed connection on rotatory flange, the inboard swing joint of adjusting the urceolus has the regulation inner tube, ignition is still installed to the inside of combustion head.

Preferably, the air door adjusting mechanism comprises a plurality of groups of air door shafts, the air door shafts are fixedly connected with air door plates, hinges are arranged on the air door shafts, the hinges are connected with each other through connecting rods, a servo motor is fixedly connected with the burner housing, and the servo motor is connected with any air door shaft of the air door shafts through a coupler.

Preferably, the front end of the adjusting inner cylinder is provided with a plurality of groups of zigzag outer edges, and the plurality of groups of zigzag outer edges are uniformly distributed at the front end of the adjusting inner cylinder.

Preferably, an air inlet bent pipe is arranged in the combustion head in a penetrating way, the front end of the air inlet bent pipe is fixedly connected with a central pipe, a flow divider is arranged at the front end of the central pipe, and a plurality of groups of gas spray pipes are arranged along the circumferential direction of the flow divider.

Preferably, the central tube is provided with a flame stabilizing disc, the front end of the central tube is arranged at the front end of the flame stabilizing disc, the front end of the central tube is provided with a plurality of groups of small holes, and the small holes are positioned at the front end of the flame stabilizing disc.

Preferably, the middle layer filler is aluminum silicate fiber cotton, the aluminum silicate fiber cotton is filled between the outer layer shell and the inner layer shell, the ignition device comprises an ignition needle and an ignition gun, the ignition needle is arranged at the rear end of the ignition gun, and the ignition device is fixedly connected to the rotary flange through a fastener.

Compared with the prior art, the utility model has the advantages and positive effects that,

1. in the utility model, in use, by adding a circle of zigzag outer edge at the outlet of the adjusting inner cylinder, the turbulent flow layer of combustion-supporting air promotes the gas which is uniformly mixed with the combustible gas to flow out through the flame stabilizing disc to form flame, so that the combustion quality is improved, the zigzag part blocks the combustion-supporting air to flow out to form a vacuum area, partial flue gas is promoted to flow back and burn combustible components in the flue gas, the emission of nitrogen oxides is further reduced, the adjusting inner cylinder and the adjusting outer cylinder are slidable, compared with the conventional single non-adjustable outer cylinder structure, the flexibility of the whole structure is greatly improved, and the problems that the proportion of primary fuel gas and primary combustion-supporting air in the total gas flow of the burner is fixed and non-adjustable, the flame turbulent flow is easy to influence the operation of the burner, and the emission of nitrogen oxides exceeds standard and pollutes the environment are solved.

2. In the utility model, in use, the zigzag outer edge of the inner cylinder is regulated to enable the air flow to be sprayed out to form a vacuum area to realize internal circulation of the flue gas, so that the combustible components which are not combusted fully in the flue gas are further combusted, the nitrogen oxides are further reduced, part of the flue gas is recycled into the hearth by the FGR technology to be combusted again, the emission of the nitrogen oxides is further reduced, the national environmental protection requirement can be met, the development of enterprises is promoted, and compared with the conventional structural design of single-conveying fuel gas, the fuel gas can be fully and uniformly mixed and combusted.

Drawings

FIG. 1 is a cross-sectional view of a hot air type low nitrogen FGR burner of the present utility model;

FIG. 2 is an overall view of a hot air type low nitrogen FGR burner of the present utility model;

FIG. 3 is a partial cross-sectional view of a perspective view of a hot-air low-nitrogen FGR burner of the present utility model;

FIG. 4 is a schematic illustration of a portion of the combustion inner barrel of a hot-air low-nitrogen FGR combustor of the present utility model.

Legend description: 1. a burner housing; 101. an outer shell; 102. middle layer filler; 103. an inner shell; 2. a combustion head; 201. adjusting the outer cylinder; 202. adjusting the inner cylinder; 3. an air door adjusting mechanism; 301. a damper shaft; 302. an air door plate; 303. a hinge; 304. a connecting rod; 305. a servo motor; 306. a coupling; 307. a zigzag outer edge; 4. rotating the flange; 5. an ignition device; 501. an ignition needle; 502. igniting the gun; 6. an air inlet elbow; 601. a central tube; 602. a shunt; 603. a gas nozzle; 604. a flame stabilizing disc; 605. and (3) small holes.

Detailed Description

In order that the above objects, features and advantages of the utility model will be more clearly understood, a further description of the utility model will be rendered by reference to the appended drawings and examples. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced otherwise than as described herein, and therefore the present utility model is not limited to the specific embodiments of the disclosure that follow.

The utility model provides a hot air type low-nitrogen FGR burner, which comprises a burner housing 1, wherein the front end of the burner housing 1 is provided with a burner head 2, the burner head 2 is connected with the burner housing 1 through a rotary flange 4, the burner housing 1 adopts a three-layer design of an outer housing 101, a middle filler 102 and an inner housing 103, the middle filler 102 is aluminum silicate fiber cotton, the aluminum silicate fiber cotton is filled between the outer housing 101 and the inner housing 103, the burner housing 1 adopts an outer, middle and inner three-layer design, the weight bearing capacity of the whole burner housing 1 is greatly improved when heated, the service life of the burner housing 1 is prolonged,

the burner housing 1 is hollow and is communicated, the bottom of the burner housing 1 is provided with an air door adjusting mechanism 3, the air quantity entering the burner housing 1 is adjustable through the arrangement of the air door adjusting mechanism 3, the sufficient combustion of fuel gas in the burner housing 1 is ensured, the burner head 2 comprises an adjusting outer cylinder 201, the adjusting outer cylinder 201 is fixedly connected to a rotary flange 4 through a fastener, the inner side of the adjusting outer cylinder 201 is movably connected with an adjusting inner cylinder 202, the front end of the adjusting inner cylinder 202 is provided with a plurality of groups of zigzag outer edges 307, the zigzag outer edges 307 are uniformly distributed at the front end of the adjusting inner cylinder 202, and the inside of the burner head 2 is also provided with an ignition device 5 for igniting the part of the burner head 2.

By adding a circle of zigzag outer edge 307 at the outlet of the adjusting inner cylinder 202, the combustion air turbulence layer promotes the combustion air and the gas which is uniformly mixed with the combustible gas to flow out through the flame stabilizing disc 604 to form flame, the combustion quality is improved, the zigzag position blocks the combustion air from flowing out to form a vacuum zone, part of flue gas is promoted to flow back and burn combustible components in the flue gas, the emission of nitrogen oxides is further reduced, the adjusting inner cylinder 202 and the adjusting outer cylinder 201 are slidable, and compared with the conventional single non-adjustable outer cylinder structure, the flexibility of the whole structure is greatly improved, and the adjusting inner cylinder 202 and the adjusting outer cylinder 201 are adjustable, so that the whole combustor can meet various different working conditions.

Example 1

As shown in fig. 1-4, the damper adjusting mechanism 3 includes a plurality of groups of damper shafts 301, damper plates 302 are fixedly connected to the plurality of groups of damper shafts 301, hinges 303 are installed on the plurality of groups of damper shafts 301, the hinges 303 are connected through connecting rods 304, a servo motor 305 is fixedly connected to the burner housing 1, and the servo motor 305 is connected with any damper shaft 301 of the plurality of groups of damper shafts 301 through a coupling 306.

The effect that its whole embodiment 1 reaches is, in use, servo motor 305 drives arbitrary fan shaft 301 in multiunit fan shaft 301 through shaft coupling 306 and rotates, all install hinge 303 on each fan shaft 301, rotate through connecting rod 304 between each hinge 303, arbitrary fan shaft 301 rotates the back, through the mutual cooperation of hinge 303 and connecting rod 304, drive multiunit fan shaft 301 and rotate simultaneously, drive fan plate 302 upset, finally reach the effect of adjusting the amount of wind that gets into combustor casing 1, compared with conventional fan door adjustment mechanism 3, new fan door adjustment mechanism 3 adjusts fan plate 302 upset efficiency greatly improved, the growth of nitrogen oxide has been reduced.

Example 2

As shown in fig. 1-4, an air inlet elbow 6 is penetrated in the combustion head 2, the front end of the air inlet elbow 6 is fixedly connected with a central tube 601, a flow divider 602 is installed at the front end of the central tube 601, a plurality of groups of gas spray pipes 603 are installed along the circumferential direction of the flow divider 602, a flame stabilizing disc 604 is installed on the central tube 601, the front end of the central tube 601 is arranged at the front end of the flame stabilizing disc 604, a plurality of groups of small holes 605 are arranged at the front end of the central tube 601, the small holes 605 are positioned at the front end of the flame stabilizing disc 604, the ignition device 5 comprises an ignition needle 501 and an ignition gun 502, the ignition needle 501 is arranged at the rear end of the ignition gun 502, the ignition device 5 is fixedly connected on a rotary flange 4 through a fastener, and the ignition device 5 is installed at the rear end of the flame stabilizing disc 604, and the natural gas and air sprayed by the ignition gun 502 can be fully mixed, so that the bypass ignition success rate reaches 100%.

The effect that its whole embodiment 2 reaches is, in use, the aperture 605 that distributes to a plurality of gas spray pipes 603 and central tube 601 front end through the shunt 602, cut apart into the multistrand gas flow and burn, realize the effect that combustible gas stratified combustion, and can make combustible gas and combustion-supporting wind mix evenly through this stratified combustion, and when actual burning, the flame segmentation burning has been formed, the heat radiating area has been increased, the condition that has avoided the flame too concentrated, thereby greatly reduced the content of nitrogen oxide in the combustion products, adjust inner tube 202 outer edge 307 and make the air current blowout form the vacuum district and realize the flue gas inner loop, make the combustible component that does not burn fully in the flue gas further burn, nitrogen oxide further reduces, FGR technique recovery part flue gas burns once more in the furnace, nevertheless further reduce nitrogen oxide emission and can accord with national environmental protection requirement, promote the development of enterprise, the gas can obtain abundant mixing and burning compared with the structural design of conventional single transportation gas.

Working principle: the gas has the inlet bend 6 and is conveyed to the position of the splitter 602, the splitter 602 distributes the gas to a plurality of gas spray pipes 603 and small holes 605 at the front end of the central pipe 601, the gas is split into a plurality of gas flows to burn, the effect of the layered combustion of the combustible gas is realized, the combustible gas and the combustion air are uniformly mixed through the layered combustion, and in the actual combustion, the flame split combustion is formed, the heat dissipation area is increased, the condition that the flame is too concentrated is avoided, the content of nitrogen oxides in combustion products is greatly reduced, the sawtooth-shaped outer edge 307 of the inner cylinder 202 is regulated, the gas flow is sprayed out to form a vacuum area to realize the internal circulation of the gas, the unburned combustible components in the gas are further burnt, the nitrogen oxides are further reduced, the servo motor 305 drives any one air door shaft 301 in a plurality of air door shafts 301 to rotate through the coupler 306, the hinge 303 is arranged on each air door shaft 301, the air door plate 302 is driven to rotate through the mutual cooperation of the hinge 303 and the link 304 after the rotation of any air door shaft 301, and finally the air door plate 302 is driven to turn over, and the air quantity of the air door plate 302 is finally driven to enter the combustion effect of the casing 1.

In summary, the utility model adds the zigzag outer edge at the outlet of the adjusting inner cylinder, so that the combustion air turbulence layer promotes the combustion air and the gas which is uniformly mixed with the combustible gas to flow out through the flame stabilizing disc to form flame, the combustion quality is improved, the zigzag part blocks the combustion air to flow out to form a vacuum area, partial flue gas is promoted to flow back to burn combustible components in the combustion air, the emission of nitrogen oxides is further reduced, the sliding between the adjusting inner cylinder and the adjusting outer cylinder is further improved, compared with the conventional single non-adjustable outer cylinder type structure, the flexibility of the whole structure is greatly improved, the adjusting inner cylinder and the adjusting outer cylinder are adjustable, the whole burner can meet various different working conditions, the small holes distributed to the front ends of the plurality of gas spray pipes and the central tube through the flow divider are divided into a plurality of gas flows to burn, the effect of the combustible gas is realized, the combustible gas and the combustible gas is mixed uniformly through the hierarchical combustion, and the flame is divided and burned in the actual combustion, the heat dissipation area is increased, the condition that the flame is concentrated is avoided, and the nitrogen oxides content in the combustion products is greatly reduced.

It should be noted that various standard components used in the present utility model are available in the market, and non-standard components can be specifically customized, and the connection manner adopted in the present utility model, such as bolting, welding, etc., is a very common means in the mechanical field, and the inventor will not be reiterated here.

The present utility model is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present utility model without departing from the technical content of the present utility model still belong to the protection scope of the technical solution of the present utility model.

Claims

1. The utility model provides a low nitrogen FGR combustor of hot-blast type, includes combustor casing (1), combustion head (2) are installed to the front end of combustor casing (1), a serial communication port, combustor casing (1) adopts outer casing (101), middle level filler (102) and inlayer casing (103) three-layer design, combustor casing (1) is cavity link up, air door adjustment mechanism (3) are installed to the bottom of combustor casing (1), combustion head (2) with be connected through rotatory flange (4) between combustor casing (1), combustion head (2) are including adjusting urceolus (201), adjust urceolus (201) through fastener fixed connection on rotatory flange (4), the inboard swing joint of adjusting urceolus (201) has and adjusts inner tube (202), ignition device (5) are still installed to the inside of combustion head (2).

2. The hot-air type low-nitrogen FGR burner according to claim 1, wherein the air door adjusting mechanism (3) comprises a plurality of groups of air door shafts (301), the air door plates (302) are fixedly connected to the plurality of groups of air door shafts (301), hinges (303) are arranged on the plurality of groups of air door shafts (301), the hinges (303) are connected through connecting rods (304), a servo motor (305) is fixedly connected to the burner housing (1), and the servo motor (305) is connected with any air door shaft (301) of the plurality of groups of air door shafts (301) through a coupler (306).

3. The hot air type low-nitrogen FGR burner according to claim 1, wherein the front end of the adjusting inner cylinder (202) is provided with a plurality of groups of zigzag outer edges (307), and the plurality of groups of zigzag outer edges (307) are uniformly distributed at the front end of the adjusting inner cylinder (202).

4. The hot-air type low-nitrogen FGR burner according to claim 1, wherein an air inlet elbow pipe (6) is penetrated in the combustion head (2), a central pipe (601) is fixedly connected to the front end of the air inlet elbow pipe (6), a splitter (602) is installed at the front end of the central pipe (601), and a plurality of groups of gas spray pipes (603) are installed along the circumferential direction of the splitter (602).

5. The hot air type low-nitrogen FGR burner according to claim 4, wherein a flame stabilizing disc (604) is mounted on the central tube (601), the front end of the central tube (601) is disposed at the front end of the flame stabilizing disc (604), a plurality of groups of small holes (605) are disposed at the front end of the central tube (601), and the small holes (605) are disposed at the front end of the flame stabilizing disc (604).

6. The hot air type low-nitrogen FGR burner according to claim 1, wherein the middle filler (102) is aluminum silicate fiber wool, the aluminum silicate fiber wool is filled between the outer shell (101) and the inner shell (103), the ignition device (5) comprises an ignition needle (501) and an ignition gun (502), the ignition needle (501) is arranged at the rear end of the ignition gun (502), and the ignition device (5) is fixedly connected to the rotary flange (4) through a fastener.