CN209840074U

CN209840074U - Self-cooling low-nitrogen combustion device

Info

Publication number: CN209840074U
Application number: CN201920483548.4U
Authority: CN
Inventors: 郭立芳; 周杰
Original assignee: Zhonghuan Energy Technology Tianjin Co Ltd
Current assignee: Zhonghuan Energy Technology Tianjin Co Ltd
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2019-12-24
Anticipated expiration: 2029-04-09

Abstract

The utility model discloses a low nitrogen burner of self-cooling, including shell, gas spray tube, burning torch, cooling muffler, be provided with the return air import on the lateral wall of shell, the inside sealing connection board that is provided with of shell, the one end and the boiler of shell are connected, the one end of gas spray tube runs through the terminal surface that the boiler was kept away from to the shell extends to the outside of shell, the other end of gas spray tube runs through sealing connection board extends to inside the boiler, the one end that the gas spray tube extends to in the boiler is provided with the combustion head, burning torch is parallel the gas spray tube sets up, the cooling muffler sets up inside the shell, the one end of cooling muffler runs through sealing connection board extends to inside the boiler. The utility model is suitable for a gas boiler, the beneficial effects of the utility model are that, through setting up multiple structure, reduce NOx's formation volume to a very big degree.

Description

Self-cooling low-nitrogen combustion device

Technical Field

The utility model relates to a gas boiler low nitrogen combustion technology field, especially a low nitrogen burner of self-cooling.

Background

At present, most factories directly convey air to the interior of a boiler during production, oxygen in the air is used as a combustion improver to enable the interior of the boiler to generate combustion reaction, however, most of components in the air are nitrogen except oxygen, and the nitrogen in the air and the oxygen are reacted under high-temperature conditions generated during the combustion reaction of most boilers, so that nitrogen oxides NOx are generated; the dissolution of NOx into water after its discharge into the atmosphere can generate nitric acid rain, which can cause extensive damage to the environment and cause huge economic losses, such as: the method has the advantages that buildings and industrial equipment are corroded, outdoor cultural relics and ancient sites are destroyed, plant leaf surfaces are damaged, forests are dead, fishes and shrimps in lakes die, soil components are destroyed, crops are reduced in yield and even die, and groundwater caused by drinking acidized substances is harmful to human bodies. Urban photochemical smog refers to urban atmosphere containing primary pollutants such as hydrocarbons, nitrogen oxides and the like, and is special mixed fog of products and reactants generated by chemical reaction due to sunlight radiation; photochemical smog has great irritation and toxic effects on human bodies, and can cause dizziness, chest pain, nausea, vomiting, coma and even death of people in severe cases. Most factories take certain measures for generating NOx, and the generation of the NOx is controlled by arranging a combustion device with a special structure and reducing the temperature of flame during combustion, wherein the low-nitrogen combustion device reduces the generation amount of the NOx by cooling the flame generated by a combustor after recycling flue gas generated by a boiler; most of the existing low-nitrogen combustion devices only adopt a single mode to control the generation of NOx, the effect is not obvious enough, and the design of separating a big-fire gas pipeline and a small-fire gas pipeline is often adopted in the gas transportation, so that the structure is complex.

SUMMERY OF THE UTILITY MODEL

To prior art not enough, the utility model aims to provide a low nitrogen burner of self-cooling to the low nitrogen burner who exists reduces the not good problem of effect of NOx formation volume in solving the background art.

The technical scheme of the utility model is that, a low nitrogen burner of self-cooling.

Utilize the technical scheme of the utility model a low nitrogen burner of self-cooling of preparation, including shell, gas spray tube, burning torch, cooling muffler, be provided with the return air import on the lateral wall of shell, the inside sealing connection board that is provided with of shell, the one end and the boiler of shell are connected, the one end of gas spray tube runs through the terminal surface that the boiler was kept away from to the shell extends to the outside of shell, the other end of gas spray tube runs through sealing connection board extends to inside the boiler, the one end that the gas spray tube extends to in the boiler is provided with the combustion head, burning torch is parallel the gas spray tube sets up, the cooling muffler sets up inside the shell, the one end of cooling muffler is run through sealing connection board extends to inside the boiler.

The inside sealed cavity that is of shell, sealing connection board is in the inside position that sets up of shell is located return air inlet with between the boiler, sealing connection board's edge with the inner wall of shell is connected, sealing connection board will two independent cavitys are separated into to the sealed cavity of shell inside.

And a three-way catalyst is arranged at the air return inlet.

The combustion head adopts a split flame type combustion head, the position of the gas spray pipe penetrating through the end face of the shell is the central position of the end face, and the position of the gas spray pipe penetrating through the sealing connecting plate is the central position of the connecting plate.

The cooling air return pipes are arranged in the number of 4-16 and are arranged along the axis direction of the gas spray pipe, and the cooling air return pipes are uniformly distributed along the circumferential direction of the gas spray pipe by taking the axis of the gas spray pipe as a reference.

An included angle of 30-45 degrees is formed between the gun head of the ignition gun and the combustion head.

By adopting the technical scheme, the utility model discloses following beneficial effect has: the flue gas generated by the boiler is recycled and then enters the boiler again, so that the flame during combustion is cooled, and the generation amount of NOx is reduced; the flame-divided type burner is adopted to divide a flame into a plurality of small flames, the small flames have large heat dissipation areas and lower flame temperatures, so that the generation amount of NOx is reduced, meanwhile, the contact areas of the small flames and flue gas subjected to circulating cooling are increased, the generation amount of NOx is further reduced, in addition, the small flames shorten the retention time of gases such as oxygen, nitrogen and the like in the flames to a certain extent, and the flame-divided type burner has obvious inhibiting effect on thermal reaction NO and fuel NO.

Drawings

Fig. 1 is a schematic structural diagram of a self-cooling low-nitrogen combustion device according to the present invention;

FIG. 2 is a right side view of a self-cooling low-nitrogen combustion apparatus according to the present invention;

in the figure, 1, a housing; 2. a gas nozzle; 3. an ignition gun; 4. cooling the air return pipe; 5. a return air inlet; 6. sealing the connecting plate; 7. a burner head; 8. a three-way catalyst.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings, and as shown in fig. 1 to 2, a self-cooling low-nitrogen combustion apparatus includes a housing 1, a gas nozzle 2, an ignition gun 3, and a cooling return pipe 4.

The characteristic of this embodiment is, be provided with return air inlet 5 on the lateral wall of shell 1, the inside sealing connection board 6 that is provided with of shell 1, the one end and the boiler of shell 1 are connected, the one end of gas spray tube 2 runs through the terminal surface that the boiler was kept away from to shell 1 and extends to the outside of shell 1, the other end of gas spray tube 2 runs through sealing connection board 6 and extends to the boiler inside, the one end that gas spray tube 2 extended to the boiler is provided with burner 7, burning torch 3 is parallel to gas spray tube 2 sets up, cooling muffler 4 sets up inside shell 1, the one end of cooling muffler 4 runs through sealing connection board 6 and extends to the boiler inside, a self-cooling low-nitrogen combustion device has adopted the structure of cooling muffler 4, recycles the flue gas that the internal combustion of boiler produced, the flue gas after being cooled circularly is utilized to reduce the combustion temperature of flame and reduce the generation of NOx, meanwhile, the cyclic utilization of the flue gas also enables the unreacted fuel in the flue gas to participate in the reaction again, the utilization rate of the fuel is improved, the cyclic utilization also contributes to the collection of the NOx in the flue gas, and the NOx is convenient to treat afterwards.

In this embodiment, the inside of the casing 1 is a sealed cavity, the position of the sealing connection plate 6 inside the casing 1 is located between the return air inlet 5 and the boiler, the edge of the sealing connection plate 6 is connected with the inner wall of the casing 1, the sealing connection plate 6 divides the sealed cavity inside the casing 1 into two independent cavities, and the arrangement of the sealing connection plate 6 prevents the backflow of the flue gas and the flame in the boiler, eliminates the interference of the flame backflow and the flue gas backflow on the combustion reaction, simultaneously prevents the backflow of the flame and the flue gas from damaging the reaction device, prolongs the service life of the reaction device, and ensures the safety of the reaction.

In the embodiment, the three-way catalyst 8 is arranged at the return air inlet 5, and because NOx is continuously accumulated in the circulating process of the flue gas, the three-way catalyst 8 can be used for treating waste gas such as NOx existing in the circulating flue gas, and the harmful components of the flue gas finally discharged into the atmosphere are reduced.

In this embodiment, the combustion head 7 is a divided flame type combustion head, the position where the gas nozzle 2 penetrates through the end surface of the housing 1 is the center position of the end surface, and the position where the gas nozzle 2 penetrates through the sealing connection plate 6 is the center position of the sealing connection plate 6.

In this embodiment, cooling muffler 4 is provided with 4-16, cooling muffler 4 is followed 2 axis directions of gas spray tube set up, cooling muffler 4 uses 2 axes of gas spray tube are the benchmark along the circumference equipartition of gas spray tube 2, cooling muffler 4 is in adopt this kind of mode of arranging around the gas spray tube 2 to set up more quantity, increased the area of contact of recirculated flue gas and flame, reduced the temperature of flame, reduced NOx's formation.

In this embodiment, an included angle of 30 to 45 degrees is formed between the gun head of the ignition gun 3 and the combustion head 7, and a certain included angle is formed between the gun head of the ignition gun 3 and the combustion head 7, so that the contact area between the flame sprayed from the ignition gun 3 and the fuel sprayed from the combustion head 7 is larger, the full combustion of the fuel is ensured, and byproducts generated due to incomplete combustion are reduced.

Above-mentioned technical scheme has only embodied the utility model discloses technical scheme's preferred technical scheme, some changes that this technical field's technical personnel probably made to some parts wherein have all embodied the utility model discloses a principle belongs to within the protection scope of the utility model.

Claims

1. The utility model provides a low nitrogen burner of self-cooling, includes shell (1), gas spray tube (2), burning torch (3), cooling muffler (4), its characterized in that: be provided with return air import (5) on the lateral wall of shell (1), the inside sealing connection board (6) that is provided with of shell (1), the one end and the boiler of shell (1) are connected, the one end of gas spray tube (2) is run through the terminal surface that the boiler was kept away from in shell (1) and is extended to the outside of shell (1), the other end of gas spray tube (2) is run through sealing connection board (6) and extend to inside the boiler, the one end that gas spray tube (2) extended to in the boiler is provided with combustion head (7), burning torch (3) are parallel gas spray tube (2) set up, cooling muffler (4) set up inside shell (1), the one end of cooling muffler (4) is run through sealing connection board (6) extend to inside the boiler.

2. A self-cooling low-nitrogen combustion device according to claim 1, wherein: the utility model discloses a boiler, including shell (1), sealed connecting plate (6) are in the inside position that sets up of shell (1) is located return-air inlet (5) with between the boiler, the edge of sealed connecting plate (6) with the inner wall of shell (1) is connected, sealed connecting plate (6) will two independent cavitys are separated into to shell (1) internal seal's cavity.

3. A self-cooling low-nitrogen combustion device according to claim 1, wherein: and a three-way catalyst (8) is arranged at the air return inlet (5).

4. A self-cooling low-nitrogen combustion device according to claim 1, wherein: the flame type burner is divided by the aid of the burner (7), the position, through which the gas spray pipe (2) penetrates through the end face of the shell (1), is the central position of the end face, and the position, through which the gas spray pipe (2) penetrates through the sealing connecting plate (6), is the central position of the sealing connecting plate (6).

5. A self-cooling low-nitrogen combustion device according to claim 1, wherein: the cooling air return pipe (4) is provided with 4-16, the cooling air return pipe (4) are followed gas spray pipe (2) axis direction sets up, cooling air return pipe (4) use gas spray pipe (2) axis is the benchmark along the circumference equipartition of gas spray pipe (2).

6. A self-cooling low-nitrogen combustion device according to claim 1, wherein: an included angle of 30-45 degrees is formed between the gun head of the ignition gun (3) and the combustion head (7).