CN216079791U

CN216079791U - Metal surface combustor

Info

Publication number: CN216079791U
Application number: CN202122377822.XU
Authority: CN
Inventors: 李亭立
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-03-18
Anticipated expiration: 2031-09-29

Abstract

The utility model discloses a metal surface burner, comprising: the air inlet end of the premixing pipeline is connected with a fan, a dendritic gas distributor is arranged in the premixing pipeline, and the air inlet end of the dendritic gas distributor penetrates through the premixing pipeline and then is connected with the main gas pipe; the tail end pipeline penetrates through the front wall of the hearth, the air inlet end outside the hearth of the tail end pipeline is connected with the air outlet end of the premixing pipeline, and the air outlet end inside the hearth is connected with the microporous metal cylinder; the tail end pipeline is internally provided with a flame-retardant disc, the micropore metal cylinder is internally provided with a built-in ignition nozzle, the built-in ignition nozzle is connected with an ignition gas pipe, and the ignition gas pipe is connected with the main gas pipe. The metal surface combustor has the advantages of more compact structure and better gas premixing effect, and can realize stable combustion and ultralow NOx emission in a small-hearth boiler.

Description

Metal surface combustor

Technical Field

The utility model relates to the technical field of burners, in particular to a metal surface burner.

Background

In recent years, with increasingly strict national environmental regulations, carbon peak reaching and carbon neutralization policies gradually fall on the ground, and higher requirements are provided for energy conservation and emission reduction technologies in the production and manufacturing links. The metal surface combustion technology utilizes the micropore metal cylinder and the premixed combustion, effectively improves the uniformity and the stability of combustion, avoids fuel concentrated combustion and local high temperature, thereby effectively reducing the NOx emission of the boiler and improving the combustion efficiency of the boiler.

The ignition structure of the existing metal surface combustor is excessively complicated, so that the uneven distribution of a flow field and combustion is caused, and the miniaturization of the size of the combustor is also restricted. Meanwhile, the structure of the premixing section of the existing metal surface combustor is too short, gas cannot be premixed with air sufficiently, and the local combustion intensity is too high, so that the adverse conditions of low efficiency and high NOx emission are caused.

The ignition structure and the premixing section structure of the existing metal surface burner have a large lifting space.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model provides a metal surface combustor which has a more compact structure and a better gas premixing effect and can realize stable combustion and ultralow NOx emission in a small-hearth boiler.

The utility model discloses a metal surface burner, comprising:

the air inlet end of the premixing pipeline is connected with a fan, a dendritic gas distributor is arranged in the premixing pipeline, and the air inlet end of the dendritic gas distributor penetrates through the premixing pipeline and then is connected with the main gas pipe;

the tail end pipeline penetrates through the front wall of the hearth, the air inlet end outside the hearth of the tail end pipeline is connected with the air outlet end of the premixing pipeline, and the air outlet end inside the hearth is connected with the microporous metal cylinder; the fire-retardant tray is arranged in the tail end pipeline, the built-in ignition nozzle is arranged in the micropore metal cylinder and connected with the ignition gas pipe, and the ignition gas pipe is connected with the main gas pipe.

As a further improvement of the utility model, the air outlet end of the premixing pipeline is connected with the air inlet end of the tail end pipeline through an elbow.

As a further improvement of the present invention, the branched gas distributor comprises: a vertical pipe, an axial pipe and a branch pipe;

the vertical pipe vertically penetrates through the premixing pipeline, the air inlet end of the vertical pipe is connected with the main gas pipe, and the air outlet end of the vertical pipe is connected with the air inlet end of the axial pipe;

the axle center pipe is coaxially arranged in the premixing pipeline, the air outlet end of the axle center pipe is communicated with a plurality of branch pipes, and a plurality of gas holes are uniformly distributed in each branch pipe.

As a further improvement of the utility model, all the branched pipes are of a multilayer structure, each layer comprises a plurality of branched pipes, and the branched pipes of two adjacent layers are arranged in a staggered manner.

As a further improvement of the utility model, the flame-retardant tray is fixed on the inner wall of the tail end pipeline through a flame-retardant tray bracket and is positioned close to the air inlet end of the tail end pipeline.

As a further improvement of the utility model, the ignition gas pipe is fixed on the inner wall of the tail end pipeline through a gas pipe bracket, the built-in ignition nozzle is arranged at the tail end of the ignition gas pipe, and the built-in ignition nozzle is close to the inner wall surface of the microporous metal cylinder.

As a further development of the utility model, the ignition gas tube is passed through the side wall of the end pipe via a sealing bolt and from there into the interior of the microporous metal cylinder.

As a further improvement of the utility model, the method also comprises the following steps: ion igniters and flame detectors;

the ion igniter and the flame detector penetrate through the front wall of the hearth and are inserted into the hearth, and the position of the ion igniter and the flame detector is close to the built-in ignition nozzle; the opening of the built-in ignition nozzle faces the ion igniter and the flame detector.

As a further improvement of the utility model, the main gas pipe is provided with a main gas valve, and the ignition gas pipe is provided with an ignition gas valve.

Compared with the prior art, the utility model has the beneficial effects that:

the ignition nozzle and the ignition gas pipe are arranged in the combustor, so that the combustor is small in size and simple in structure, the ignition requirement of the combustor is met, meanwhile, the interference on the flow field in the combustor is small, and the uniformity of flowing and combustion is improved;

the gas holes of the dendritic gas distributor are uniformly and densely distributed in the inner space of the premixing pipeline, and the gas enters the premixing pipeline through the gas holes, so that the gas is prevented from gathering in a local space, and the gas and the air are rapidly mixed in the premixing pipeline; under the further mixing and disturbance of the elbow, the flame-retardant disc and the tail end pipeline, the gas and the air are fully premixed, the combustion uniformity and stability are improved, and the NOx content of the flue gas is reduced;

the flame-retardant disc and the dendritic gas distributor provided by the utility model have narrow flow passages, so that the occurrence of backfire can be effectively prevented, and the safety of a combustor is improved.

Drawings

FIG. 1 is a schematic view of a metal surface burner according to an embodiment of the present invention;

FIG. 2 is a schematic view of the premix conduit and the dendritic gas distributor of FIG. 1;

fig. 3 is a schematic view of the structure of the end pipe, the fire retardant pan and the built-in ignition nozzle of fig. 1.

In the figure:

1. a flame retardant pan; 2. bending the pipe; 3. a branched gas distributor; 31. a vertical tube; 32. a hub tube; 33. a branch pipe; 34. a gas hole; 4. a premix conduit; 5. a blower; 6. a seal bolt; 7. a main gas pipe; 8. a main gas valve; 9. an ignition gas valve; 10. an ignition gas pipe; 11. a hearth; 12. a hearth outlet; 13. a microporous metal cylinder; 14. an ignition nozzle is arranged inside; 15. an ion igniter; 16. a flame detector; 17. a gas pipe holder; 18. a front wall of the hearth; 19. a flame retardant tray support; 20. a terminal pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The utility model is described in further detail below with reference to the attached drawing figures:

in order to further improve the combustion efficiency and stability of the combustor and reduce the emission of flue gas, the utility model can achieve better premixing of a flow field and fuel gas through a compact combustor structure and an efficient premixing section design; meanwhile, through the design of the flame-retardant disc, the utility model can prevent the occurrence of deflagration and tempering and improve the safety performance of equipment. To this end, as shown in FIGS. 1-3, the present invention provides a metal surface burner that is particularly adapted for use with small-hearth boilers; it includes: the device comprises a flame-retardant disc 1, an elbow 2, a dendritic gas distributor 3, a premixing pipeline 4, a blower 5, a sealing bolt 6, a main gas pipe 7, a main gas valve 8, an ignition gas valve 9, an ignition gas pipe 10, a hearth 11, a hearth outlet 12, a microporous metal cylinder 13, a built-in ignition nozzle 14, an ion igniter 15, a flame detector 16, a gas pipe bracket 17, a hearth front wall 18, a flame-retardant disc bracket 19 and a tail end pipeline 20; specifically, the method comprises the following steps:

a premixing pipeline 4 and a tail end pipeline 20 are cylindrical channels, the air inlet end of the premixing pipeline 4 is connected with an air outlet of an air blower 5, the air outlet end of the premixing pipeline is connected with the air inlet end of an elbow 2, the air outlet end of the tail end pipeline 20 of the elbow 2 is connected with the air inlet end of a microporous metal cylinder 13, and the air outlet end of the tail end pipeline 20 is connected with a microporous metal cylinder 13; the premixing pipe 4, the elbow 2 and the tail end pipe 20 are connected through bolts, the tail end pipe 20 penetrates through the front wall 18 of the hearth, the air inlet end of the tail end pipe 20 is arranged outside the hearth 11, the air outlet end of the tail end pipe 20 is arranged in the hearth 11, and the tail end pipe 20 is sealed and fixed at the pipe hole of the front wall 18 of the hearth.

A dendritic gas distributor 3 is arranged in a premixing pipeline 4, and the gas inlet end of the dendritic gas distributor 3 penetrates through the premixing pipeline 4 and then is connected with a main gas pipe 7; the gas entering through the main gas pipe 7 and the branched gas distributor 3 is premixed with the air entering through the blower 5 in the premixing pipe 4. Specifically, as shown in fig. 2, the branched gas distributor 3 of the present invention includes: a vertical pipe 31, an axial pipe 32, a branch pipe 33, and a gas hole 34; the vertical pipe 31 vertically penetrates through the premixing pipe 4, the external air inlet end of the vertical pipe 4 is connected with the main gas pipe 7, and the internal air outlet end of the vertical pipe 31 is connected with the air inlet end of the axis pipe 32; the axial tube 32 is coaxially arranged in the premixing pipeline 4, the air outlet end of the axial tube 32 is communicated with a plurality of branch tubes 33, and each branch tube 33 is uniformly provided with a plurality of gas holes 34 in the direction away from the blower 5. Further, all the branched pipes 33 are of a multilayer structure, each layer includes a plurality of branched pipes, and the branched pipes of two adjacent layers are arranged in a staggered manner.

The flame-retardant disc 1 is arranged in the tail end pipeline 20, preferably, the flame-retardant disc 1 is fixed on the inner wall of the tail end pipeline 20 through a flame-retardant disc bracket 19 and is positioned close to the elbow 2; an internal ignition nozzle 14 is arranged in the micropore metal cylinder 13, the internal ignition nozzle 14 is connected with an ignition gas pipe 10, and the ignition gas pipe 10 is connected with the main gas pipe 7. Specifically, the method comprises the following steps: the ignition gas pipe 10 passes through the side wall of the terminal pipe 20 via the seal bolt 6 and thus enters the inside of the microporous metal cylinder 13; in the tail end pipeline 20, an ignition gas pipe 10 is fixed on the inner wall of the tail end pipeline 20 through a gas pipe bracket 17, a built-in ignition nozzle 14 is arranged at the tail end of the ignition gas pipe 10, and the built-in ignition nozzle 14 is close to the inner wall surface of the microporous metal cylinder 20; the ion igniter 15 and the flame detector 16 are inserted into the hearth 11 through the front wall 18 of the hearth and are positioned close to the built-in ignition nozzle 14; the opening of the built-in ignition nozzle 14 faces the ion igniter 15 and the flame detector 16; the main gas pipe 7 is provided with a main gas valve 8, and the ignition gas pipe 10 is provided with an ignition gas valve 9.

The working principle of the utility model is as follows:

before the combustor is ignited to work, the main gas valve 8 and the ignition gas valve are closed 9, and gas does not enter the combustor; the blower 5 is started to purge, so that the generation of detonation in the ignition stage is effectively prevented;

when the burner is ignited, the main gas valve 8 is kept closed, the ignition gas valve 9 is opened, the ion igniter 15 works, and a small amount of gas is sprayed out from the built-in ignition nozzle 14 and is ignited; when the flame detector 16 detects a stable flame signal, the main gas valve 8 and the blower 5 are opened, a large amount of gas enters the premixing pipeline 4 through the branched gas distributor 3, is fully mixed with air, flows through the elbow 2 and the tail end pipeline 20, is finally ignited on the surface of the microporous metal cylinder 13, and the ignition gas valve 9 is closed after the combustion is stable;

if the ignition fails or the flame is extinguished due to other reasons, the main gas valve 8 and the ignition gas valve 9 are closed rapidly, and the blower 5 is kept open for continuous purging, so as to prevent the occurrence of explosion during backfire and reignition.

The utility model has the advantages that:

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal surface burner, comprising:

2. The metal surface burner of claim 1, wherein the outlet end of the premix tube is connected to the inlet end of the tip tube by an elbow.

3. The metal surface burner of claim 1, wherein the dendritic gas distributor comprises: a vertical pipe, an axial pipe and a branch pipe;

4. A metal surface burner as in claim 3, wherein all of said branched pipes are of a multi-layer structure and each layer includes a plurality of branched pipes, and the branched pipes of two adjacent layers are arranged alternately.

5. The metal surface burner of claim 1, wherein the flame retardant tray is secured to the inner wall of the tip conduit by a flame retardant tray support and is positioned proximate the air intake end of the tip conduit.

6. The metal surface burner of claim 1, wherein the ignition gas tube is secured to an inner wall of the tip conduit by a gas tube holder, and the tip of the ignition gas tube is provided with the built-in ignition burner that is adjacent to an inner wall surface of the microporous metal cylinder.

7. The metal surface burner of claim 6, wherein the ignition gas tube passes through a sidewall of the tip conduit via a sealing bolt and thence into the interior of the microporous metal cylinder.

8. The metal surface burner of claim 1, further comprising: ion igniters and flame detectors;

9. The metal surface burner of claim 1, wherein the primary gas tube is fitted with a primary gas valve and the ignition gas tube is fitted with an ignition gas valve.