CN219510791U - Hole plate type low-nitrogen combustion head and low-nitrogen combustor - Google Patents

Abstract

The utility model discloses an orifice plate type low-nitrogen combustion head and a low-nitrogen combustor, which comprise a premixed gas circulation cavity and a plurality of inserting pieces, wherein a plurality of first long holes are formed in the surface of the premixed gas circulation cavity, the inserting pieces comprise a body, a plurality of tongues extending laterally along the body are arranged on the body at intervals, the body of each inserting piece is positioned in the premixed gas circulation cavity, the tongues are inserted into the first long holes and extend out of the surface of the premixed gas circulation cavity, gaps are reserved between the tongues and the inner walls of the first long holes, a plurality of second long holes are formed in the tongues, and the second long holes extend from the inside of the premixed gas circulation cavity to the outside. According to the utility model, the cold and hot deformation of the inserting sheet is utilized to generate friction with the premixed gas circulation cavity, so that the accumulation of combustion products such as carbon deposition and the like at the flame channel is eliminated, the service life is prolonged, and the cost is low.

Description

Hole plate type low-nitrogen combustion head and low-nitrogen combustor

Technical Field

The present utility model relates to a burner, and more particularly to a low nitrogen burner and a low nitrogen burner with an orifice plate.

Background

The main structure of the combustion head of the existing low-nitrogen burner is that a metal net is arranged at the head part for forming flame, and the fine combustion flame is formed by the division effect of dense meshes of the metal net on air flow. Such as the burner disclosed in chinese patent publication No. CN213453618U and publication No. CN 205332211U.

The disadvantage of this structure is that the dense metal net is easy to cause local mesh blocking due to carbon deposition generated after combustion, and the uneven flame distribution of the metal net surface after blocking has large temperature difference, which can cause the damage of the metal net due to the too high local temperature of other areas, and affect the service life of the burner. And the metal net is a special part, so that the cost for replacing the metal net is high.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a hole plate type low-nitrogen combustion head, which aims to solve the problem of blockage of the combustion head and prolong the service life of a combustor. The utility model aims to provide a low-nitrogen burner which is not easy to block and has long service life.

The technical scheme of the utility model is as follows: the utility model provides a low nitrogen combustion head of orifice plate formula, includes premix gas circulation cavity and a plurality of inserted sheet, a plurality of first slot holes are seted up on the surface of premix gas circulation cavity, the inserted sheet includes the body, the interval is equipped with a plurality of tongues on the body, the body of inserted sheet is located premix gas circulation cavity's inside, the tongue inserts first slot hole is followed premix gas circulation cavity's surface stretches out, the tongue with leave the clearance between the inner wall of first slot hole, be equipped with a plurality of second slot holes on the tongue, the second slot hole by premix gas circulation cavity's inside is outside extension.

Further, the tongue thickness of the insert sheet is 0.2-1 mm.

Further, the inserting sheet is of a strip-shaped flat plate structure, and the length-width ratio of the body of the inserting sheet is greater than 10:1.

Further, the premixed gas circulation cavity is a cylindrical barrel, and the length direction of the first long hole is the direction of a generatrix of the cylindrical barrel.

Further, the connection points of the inserting sheet and the premixed gas circulation cavity are positioned at two ends of the body of the inserting sheet.

The other technical scheme of the utility model is as follows: a low nitrogen burner comprising the orifice plate type low nitrogen burner head.

Compared with the prior art, the utility model has the advantages that:

the gap between the tongue of the insert and the inner wall of the first long hole and the gap between the tongue of the insert and the second long hole are used for respectively forming a vertical and horizontal airflow passage perpendicular to the surface of the premixed gas flowing cavity and along the surface of the premixed gas flowing cavity, so that the uniform combustion of the surface of the combustion head is realized, the low-nitrogen requirement is met, meanwhile, in the process of changing all working conditions of the combustion head, the tongue of the insert deforms to a certain extent, friction is transmitted between the tongue of the insert and the inner wall of the first long hole, and carbon deposition and other easily-blocked substances in the gap between the tongue and the inner wall of the first long hole are eliminated, so that the service life of the combustor is prolonged.

Drawings

Fig. 1 is a schematic structural view of a low nitrogen burner of example 1.

Fig. 2 is a schematic diagram of the orifice plate type low nitrogen burner head of example 1.

Fig. 3 is a schematic structural diagram of a premixed gas circulation cavity of embodiment 1.

Fig. 4 is a schematic structural view of the insert sheet.

Fig. 5 is a schematic cross-sectional structure of the insert of embodiment 1 mated with the premix gas flow chamber.

Fig. 6 is a schematic diagram of a partial structure of the insert of embodiment 1 and the premixed gas circulation cavity.

Fig. 7 is a schematic structural view of a low nitrogen burner of example 2.

Fig. 8 is a schematic view of the bottom view structure of the low nitrogen burner of example 2.

Detailed Description

The utility model is further illustrated, but is not limited, by the following examples.

Embodiment 1 referring to fig. 1, a low nitrogen burner according to the present embodiment includes a connection flange 100 and an orifice plate type low nitrogen burner head 200 connected to the connection flange 100. The connection flange 100 is used to mount the entire low nitrogen burner within the combustion furnace of a boiler. The orifice plate type low nitrogen burner head 200 is fixed to the connection flange 100. In this embodiment, a swirl vane 300 is fixedly disposed in the middle of the connection flange 100, and a mixture of gas and air (oxygen) flows through the swirl vane 300 and then enters the plate-type low-nitrogen burner 200, so that the mixing homogenization of the gas and air (oxygen) is enhanced and the mixture flows out from the surface of the orifice plate-type low-nitrogen burner 200 for combustion more quickly through the guidance of the swirl vane 300. As shown in fig. 1, the connection flange 100 and the swirl blade 300 may be formed by punching a metal plate, the root of the swirl blade 300 is connected with the intermediate ring 400, the tip of the swirl blade 300 is connected with the connection flange 100 through a connection strip 500, and when the swirl blade 300 is installed, the swirl blade 300 is twisted by a certain angle.

Referring to fig. 2, the orifice plate type low-nitrogen burner 200 of the present embodiment has a cylindrical shape and includes a premixed gas flowing cavity 201. The premixed gas circulation cavity 201 is a cylindrical cylinder, the head end of the cylinder is closed, the tail end of the cylinder is open, and the tail end of the premixed gas circulation cavity 201 is welded and fixed with the connecting flange 100. As shown in fig. 3, a plurality of first long holes 202 are formed on the surface of the premixed gas flowing cavity 201, the first long holes 202 are arranged at intervals along the axis of the length direction, and a plurality of rows of the first long holes are arranged by taking the direction of a generatrix of the cylindrical barrel as the direction of a generatrix of the cylindrical barrel, so that inserting sheets are conveniently arranged to form the ventilation holes of the premixed gas.

The insert structure is shown in fig. 4, and is a strip-shaped flat plate structure, the insert comprises a strip-shaped body 203, and the aspect ratio of the body 203 of the insert is greater than 10:1. The upper edge of the body 203 extends upward to form a plurality of tongues 204, and the tongues 204 are spaced apart from each other. The tongue portions 204 are spaced at the same intervals as the first elongated holes 202, so that the insert pieces can be inserted into the premixed gas circulation chamber 201.

As shown in fig. 5 and 6, when the insert piece is inserted into the premixed gas circulation cavity 201, the body 203 of the insert piece is positioned inside the premixed gas circulation cavity 201, and is inserted into the first long hole 202 by the tongue 204 to protrude from the surface of the premixed gas circulation cavity 201. The overall thickness of the tab is slightly less than the width of the first slot 202 and the length of each tongue 204 is slightly less than the length of the first slot 202. After the tongue 204 is inserted into the first slot 202, a gap 206 of 0.2-1 mm is left between the tongue 204 and the inner wall of the first slot 202, and the gap 206 is used for the circulation of premixed gas.

The tongue 204 is provided with a plurality of second elongated holes 205 arranged in parallel, and the length direction of the second elongated holes 205 extends from the body 203 to the tongue 204, i.e. up and down as shown in fig. 4. After the tongue 204 is inserted into the first slot 202, the second slot 205 is along the normal direction of the surface of the premixed gas flowing cavity 201, a part of the second slot 205 is located inside the premixed gas flowing cavity 201, and another part of the second slot 205 is exposed outside the premixed gas flowing cavity 201, so that the second slot 205 also forms a premixed gas flowing channel, meanwhile, because of the length limitation of the second slot 205, the premixed gas flows to two sides when flowing to the head end of the second slot 205, and collides and mixes with the premixed gas reserved by the gap 206 between the tongue 204 and the first slot 202, thereby forming a crisscrossed gas flow on the surface of the premixed gas flowing cavity 201, and meeting the requirement of combustion.

In order to enable the insert to be connected with the premixed gas circulation cavity 201, and simultaneously enable the insert to have a certain deformation space, two ends of the insert body 203 can be fixed with the premixed gas circulation cavity 201 in a spot welding mode, besides, two tongues 204 can be selected to be welded and fixed with the premixed gas circulation cavity 201, or in order to facilitate replacement of the insert, torsion deformation can be performed after the tongues 204 are inserted into the first long holes 202 to be clamped with the premixed gas circulation cavity 201, or pins can be penetrated into the second long holes 205 of the tongues 204 to prevent the insert from falling out.

According to the embodiment of the utility model, various deformation is generated on the strip-shaped inserting piece in the combustion and cooling processes of the burner, so that a certain friction scratch is generated between the tongue 204 and the first long hole 202, and carbon deposition accumulated at the gap 206 can fall off to reduce the blocking phenomenon.

In embodiment 2, please refer to fig. 7 and 8, in order to adapt to the combustion requirements of different combustion apparatuses, the shape of the low-nitrogen burner may not be cylindrical, for example, in this embodiment, a plate-type low-nitrogen burner 200' is fixed on a square annular connecting flange 100', the plate-type low-nitrogen burner 200' includes a rectangular box-shaped premixed gas flowing cavity 201' and an insert sheet, wherein the premixed gas flowing cavity 201' is an opening at the bottom surface and is fixed with the connecting flange 100', and the top surface of the premixed gas flowing cavity 201' is used to form a flowing channel of premixed gas in cooperation with the insert sheet. The top surface of the premixed gas flowing cavity 201' is a plane, which can be similar to the cylindrical surface of the premixed gas flowing cavity in embodiment 1, and has an infinite radius, and the specific connection form of the premixed gas flowing cavity and the inserting piece is the same as that of embodiment 1, and is not described herein, thus forming a square low-nitrogen burner.

Claims (6)

1. The utility model provides a low nitrogen combustion head of orifice plate formula, its characterized in that, including premixing gas circulation cavity and a plurality of inserted sheet, a plurality of first slot holes are seted up on the surface of premixing gas circulation cavity, the inserted sheet includes the body, the interval is equipped with a plurality of tongues that extend along body side direction on the body, the body of inserted sheet is located premixing gas circulation cavity's inside, the tongue inserts first slot hole is followed premixing gas circulation cavity's surface stretches out, the tongue with leave the clearance between the inner wall of first slot hole, be equipped with a plurality of second slot holes on the tongue, the second slot hole by premixing gas circulation cavity's inside is outside extension.

2. The orifice plate type low-nitrogen combustion head according to claim 1, wherein the tongue thickness of the insert sheet is 0.2-1 mm.

3. The orifice plate type low-nitrogen burner head of claim 1, wherein said insert sheet is an elongated flat plate structure.

4. The orifice plate type low-nitrogen combustion head according to claim 1, wherein the premixed gas circulation cavity is a cylindrical barrel, and the length direction of the first long hole is the generatrix direction of the cylindrical barrel.

5. The orifice plate type low nitrogen burner head of claim 1, wherein the connection points of the insert sheet and the premixed gas circulation cavity are located at both ends of the body of the insert sheet.

6. A low nitrogen burner comprising an orifice plate type low nitrogen burner head as claimed in any one of claims 1 to 5.