CN214619519U

CN214619519U - Sub-low NOxBurner with a burner head

Info

Publication number: CN214619519U
Application number: CN202120479775.7U
Authority: CN
Inventors: 杜一鸣
Original assignee: Shanghai Hesen Electro Machinery Co ltd
Current assignee: Shanghai Hesen Electro Machinery Co ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-11-05
Anticipated expiration: 2031-03-05

Abstract

The utility model relates to a inferior low NOx combustor, arrange (2) including main part (1) and many fires of parallel arrangement in main part (1), fire arrange (2) intercommunication gas distributing pipe (3), fire arrange (2) go up parallel arrangement and have a plurality of fire punch combination (4), fire punch combination (4) including main fire hole (41) and supplementary fire hole (42), main fire hole (41) be close to the fire and arrange the edge, the hole center of supplementary fire hole (42) be located the central line that the fire was arranged (2). Compared with the prior art, the utility model has the advantages of the fire heat-discharging load is low, the flame height is low, the nitrogen oxide emission concentration is low, can use with the constant speed fan is supporting.

Description

Sub-low NOx burner

Technical Field

The utility model relates to a combustor technical field, concretely relates to inferior low NOx combustor.

Background

Along with the increasing of the national environmental protection treatment. There are ever new standards for the emission of flue gases from gas appliances, especially for the emission of NOx. At present, the heating coal gas-changing project taking Beijing area as the center already starts to put forward the low-nitrogen emission requirement, and the low-nitrogen emission requirement executed in Tianjin area is 100mg/KW.M³Is a sublowNitrogen emission index.

The utility model patent CN208886768U discloses a inferior low NOx combustor for hanging stove burns the function under the negative pressure condition, and the combustor includes mainboard, support and fire row, and the upper portion of mainboard is located to the fire row, and both sides around the mainboard are located to the support, and the mainboard lower part is equipped with the injection mouth, and the gas that the ratio is good gets into the combustor with the air by the injection mouth, and the combustor bottom is equipped with air baffle, and the gas that is introduced by the injection mouth gets into each fire row after a regulation of air-conditioning zone. The utility model has the advantages of short flame, low combustion temperature, good stability, less NOx generated, etc. However, the sub-low NOx burner needs to be matched with a variable speed fan, and the requirement on the fan is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a inferior low NOx combustor only needs the constant speed fan can realize the low-nitrogen burning.

The purpose of the utility model can be realized through the following technical scheme: the utility model provides a inferior low NOx combustor, arranges including main part and many fires of parallel arrangement in the main part, the fire arrange intercommunication gas distributing pipe, the fire arrange and go up parallel arrangement and have a plurality of fire hole groups, fire hole group including main fire hole and supplementary fire hole, main fire hole be close to the fire and arrange the edge, the hole center in supplementary fire hole be located the central line that the fire was arranged. The main fire hole is close to the fire row gap, increases the area of contact of gas and air, has comparatively sufficient air to flow out from the gap between the fire row during burning, except that the oxygen that provides the burning, still has the effect of cooling flame. The residual oxygen after the combustion of the main fire hole is contacted with the flame of the auxiliary fire hole at the tail end of the main flame along with the rise of the flame, so that air (oxygen) is supplied to the auxiliary fire hole, the flame of the auxiliary fire hole is completely combusted, and the excessive oxygen is consumed, thereby reducing the discharge of the oxygen.

Further, fire hole group include strong fire hole group and weak fire hole group, every strong fire hole group include 12 main fire holes and 2 supplementary fire holes, every weak fire hole group include 4 main fire holes and 1 supplementary fire hole.

Furthermore, in the group of strong fire holes, 12 main fire holes are respectively and symmetrically arranged at two sides of the fire grate, 6 auxiliary fire holes are respectively arranged at each side, 2 auxiliary fire holes are arranged between the main fire holes, the 12 main fire holes are divided into 3 equal parts, and 4 main fire holes are respectively arranged at two sides of each auxiliary fire hole;

in the weak fire hole group, 4 main fire holes are respectively and symmetrically arranged at two sides of the fire grate, each side is 2, and 1 auxiliary fire hole is arranged at one side of the 4 main fire holes.

The main fire hole and the auxiliary fire hole are rectangular, the short sides of the rectangle face the two sides of the fire grate, the size of the main fire hole is 0.7-0.8 multiplied by 2.4-2.5 mm, and the size of the auxiliary fire hole is 0.5-0.7 multiplied by 4.5-5.5 mm.

Main fire hole be 1.45 ~ 1.55mm along the central line direction interval that the fire was arranged, perpendicular fire is arranged and is arranged the central line direction interval and be 1.55 ~ 1.65mm, the minor face that is close to fire row edge is not more than 0.3mm from the distance that fire was arranged the edge, supplementary fire hole be 3.5 ~ 4.5mm along the central line direction interval that the fire was arranged, along the central line direction that the fire was arranged, supplementary fire hole and rather than adjacent main fire hole between the distance be 1.2 ~ 1.4 mm.

The strong fire hole group is arranged at the middle front end of the fire grate, and the weak fire hole group is arranged at the tail end of the fire grate.

The strong fire hole group have 9 groups, the weak fire hole group has 7 groups, and the symmetry is provided with 4 main fire holes between strong fire hole group and weak fire hole group region, 2 each of both sides of fire row. The main fire holes and the auxiliary fire holes are respectively 140 holes and 25 holes in each fire row.

The gas distributing pipe is connected with a gas inlet, and is provided with a nozzle which is communicated with the fire grate. The gas enters the gas distribution pipe from the gas inlet, is distributed to each fire row by the nozzle on the gas distribution pipe, and is ignited by the fire species when the gas flows out from the fire holes of the fire rows at a certain speed.

Furthermore, a secondary air distribution plate is arranged on the main body, and a plurality of air distribution holes are formed in the secondary air distribution plate. And the gas entering from the gas inlet and the air entering from the air distribution hole are secondarily mixed in the main body to obtain the final gas with a primary air coefficient of 45-55%. The secondary air distribution plate has the function of limiting excessive secondary air from entering the fire grate spacing gap and ensuring that the primary air coefficient of final fuel gas enters the fire grate ejection port at about 50%. The primary air and the secondary air entering the burner must be reasonably distributed, wherein the primary air should be kept at about 50%, if too much primary air can cause the flame of the main fire hole to be elongated and separated from the flame after contacting with the oxygen-rich secondary air during combustion, the flame temperature can be increased and incomplete combustion substances CO can be generated, if too little secondary air is generated, the primary air can be increased, and if the primary air is increased, the flame of the main fire hole can still be separated from the flame, and too much incomplete combustion substances CO can be generated, so the flow of the secondary air must be strictly controlled. About 50% of the data are obtained on the basis of hundreds of tests, and the air distribution holes on the secondary air distribution plate are subjected to hole diameter and position distribution obtained after experimental correction after simulation according to an air fluid computer.

The main body is also provided with a front support and a rear support, the front support fixes the fire grate and the gas distribution pipe, and the rear support fixes the fire grate; the fire rows are 13-14 mm in distance, and secondary air channels are further arranged among the fire rows.

In order to reduce the flame height, reduce the reaction time of high temperature and oxygen, thereby inhibiting the generation of nitrogen oxides, reducing the heat load of each row of fire, enlarging the fire hole area, reducing the flame height, and adopting the principle of oxygen-enriched combustion to enable the excess oxygen to reach the temperature of cooling flame. Simultaneously, the flame temperature in the high temperature area is reduced, and the primary air coefficient entering the combustor is increased. The aim of reducing the emission concentration of nitrogen oxides is achieved by utilizing the contact area of secondary air and flame, the emission concentration of the nitrogen oxides is controlled to be 70-100 mg/kw.h, the requirements of the current national standard are met, and the wall hanging furnace is suitable for wall hanging furnaces with the emission concentration of 70mg/kw.h below 100 mg/kw.h.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model can realize low-nitrogen combustion only by the constant-speed fan through the burner;

2. the utility model discloses a main position, shape, figure etc. of fire hole and supplementary fire hole set up and select, increase the area of contact of gas and air, have comparatively sufficient air to flow from the crack between the fire row during burning, except providing the oxygen of burning, still have the cooling flame effect, have surplus oxygen after main fire hole burning, rise along with flame, contact with the flame in supplementary fire hole at the end of main flame, provide air (oxygen) for supplementary fire hole, make the flame in supplementary fire hole burn completely, and surplus oxygen is also consumed, thereby reduce the emission of oxygen;

3. the utility model increases the fire hole area, reduces the flame height, and reduces the reaction time of high temperature and oxygen;

4. the utility model has the advantages that through the design optimization of the whole structure, the heat discharge load of each fire is reduced to 1.6-1.8 kw, and the generation of nitrogen oxides is inhibited;

5. the utility model discloses a setting and design of secondary air distribution board ensure that the primary air coefficient of final gas is about 50%, prevent to produce flame and lengthen, from the flame phenomenon, reduce the production of incomplete combustion thing CO.

Drawings

FIG. 1 is a front view of a sub-low NOx burner of the present invention;

FIG. 2 is a top view of the sub-low NOx burner of the present invention;

FIG. 3 is a schematic structural view of the secondary air distribution plate of the present invention;

FIG. 4 is a schematic view of a fire hole group according to the present invention;

in the figure: 1-main body, 2-fire grate, 3-gas distribution pipe, 4-fire hole group, 4 a-strong fire hole group, 4 b-weak fire hole group, 41-main fire hole, 42-auxiliary fire hole, 5-gas inlet, 6-secondary air distribution plate, 61-air distribution hole, 7-front support, 8-rear support and 9-secondary air channel.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The following examples are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following examples.

Example 1

The utility model provides a inferior low NOx combustor, as shown in fig. 1 ~ 2, including main part 1, fire row 2, gas distributing pipe 3, gas air inlet 5, secondary air distributing plate 6, fore-stock 7, after-poppet 8 and secondary air passageway 9, 18 fire row 2 parallel arrangement is at the top of main part 1, the fire row interval is 13.5mm or 13.7mm, still be provided with fore-stock 7 and after-poppet 8 in main part 1, 2 both ends are fixed respectively on fore-stock 7 and after-poppet 8 in the fire row, still be fixed with gas distributing pipe 3 on fore-stock 7, gas distributing pipe 3 is connected with gas air inlet 5, still be provided with a plurality of nozzles on the gas distributing pipe 3, the gas gets into gas distributing pipe 3 by gas air inlet 5, arrange 2 by each fire by the nozzle distribution on the gas distributing pipe 3. The secondary air distribution plate 6 is provided at the bottom of the main body 1, as shown in fig. 3, a plurality of air distribution holes 61 are provided at the secondary air distribution plate 6, a secondary air passage 9 is further provided at the fire row gap, and the secondary air passage 9 communicates with the inner cavity of the main body 1.

As shown in fig. 4, a plurality of fire hole groups 4 are arranged in parallel on each fire grate 2, wherein each fire hole group 4 includes nine strong fire hole groups 4a arranged at the front end of the fire grate 2 and seven weak fire hole groups 4b arranged at the tail end of the fire grate 2, each strong fire hole group 4a includes twelve main fire holes 41 and two auxiliary fire holes 42, the twelve main fire holes 41 are symmetrically arranged at two sides of the fire grate 2 respectively, each side has six auxiliary fire holes 42, the two auxiliary fire holes 42 are arranged between the main fire holes 41, the twelve main fire holes 41 are divided into three equal parts, each auxiliary fire hole 42 has four main fire holes at two sides, each weak fire hole group 4b includes four main fire holes 41 and one auxiliary fire hole 42, the four main fire holes 41 are symmetrically arranged at two sides of the fire grate 2 respectively, each side has two auxiliary fire holes 42, and one auxiliary fire hole 42 is arranged at the front side of the four main fire holes 41. Four main fire holes 41 are arranged between the last strong fire hole group 4a and the first weak fire hole group 4b, the 4 main fire holes 41 are respectively positioned at two sides of the fire row, and two main fire holes are respectively positioned at each side of the fire row. On each fire row, the number of the main fire holes 41 is 140, the number of the auxiliary fire holes is 25, the main fire holes 41 and the auxiliary fire holes 42 are rectangular, the short sides of the rectangles face the two sides of the fire row 2, the size of the main fire holes 41 is 0.76 multiplied by 2.45mm, and the size of the auxiliary fire holes 42 is 0.6 multiplied by 5 mm. The distance between the main fire holes 41 along the central line direction of the fire row 2 is 1.5mm, the distance between the vertical fire row 2 and the central line direction is 1.6mm, the distance between the short side close to the edge of the fire row 2 and the edge of the fire row 2 is not more than 0.3mm, the distance between the auxiliary fire holes 42 along the central line direction of the fire row 2 is 4.1mm, and the distance between the auxiliary fire holes 42 and the main fire holes 41 adjacent to the auxiliary fire holes is 1.3mm along the central line direction of the fire row 2.

The performance test of the sub-low NOx burner of this example was performed, and the shaded pole ac constant velocity blower was used to blow air, and the performance parameters were measured as follows:

1. heat load: 1.5-1.6 kw/row;

2. carbon monoxide in flue gas: <150 ppm;

3. nitrogen oxides in flue gas: <100 mg/kw.h;

4. thermal load adjustment range: 100 to 35 percent.

The embodiments described above are intended to enable those skilled in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.

Claims

1. The utility model provides a inferior low NOx combustor, includes main part (1) and many fire rows (2) of parallel arrangement on main part (1), fire row (2) intercommunication gas distribution pipe (3), its characterized in that, fire row (2) go up parallel arrangement have a plurality of fire hole group (4), fire hole group (4) including main fire hole (41) and supplementary fire hole (42), main fire hole (41) be close to the fire row edge, the hole center of supplementary fire hole (42) be located the central line of fire row (2).

2. A sub-low NOx burner according to claim 1, characterised in that said fire hole groups (4) comprise groups of strong fire holes (4a) and groups of weak fire holes (4b), each of said groups of strong fire holes (4a) comprising 12 main fire holes (41) and 2 auxiliary fire holes (42), and each of said groups of weak fire holes (4b) comprising 4 main fire holes (41) and 1 auxiliary fire hole (42).

3. The sub-low NOx burner of claim 2, wherein in the group of the strong fire holes (4a), 12 main fire holes (41) are respectively and symmetrically arranged at two sides of the fire row (2), 6 auxiliary fire holes (42) are respectively arranged at each side of the fire row, 2 auxiliary fire holes (41) are arranged between the main fire holes (41), the 12 main fire holes (41) are divided into 3 equal parts, and two sides of each auxiliary fire hole (42) are respectively provided with 4 main fire holes;

in the weak fire hole group (4b), 4 main fire holes (41) are respectively and symmetrically arranged at two sides of the fire row (2), each side is 2, and 1 auxiliary fire hole (42) is arranged at one side of the 4 main fire holes (41).

4. The sub-low NOx burner of claim 3, wherein the main fire holes (41) and the auxiliary fire holes (42) are rectangular, the short sides of the rectangle face the two sides of the fire grate (2), the size of the main fire holes (41) is 0.7-0.8 x 2.4-2.5 mm, and the size of the auxiliary fire holes (42) is 0.5-0.7 x 4.5-5.5 mm.

5. The sub-low NOx burner of claim 4, wherein the distance between the main fire holes (41) along the center line of the fire row (2) is 1.45-1.55 mm, the distance between the short sides of the fire row (2) close to the edge is 1.55-1.65 mm, the distance between the short sides of the fire row (2) and the edge of the fire row (2) is not more than 0.3mm, the distance between the auxiliary fire holes (42) along the center line of the fire row (2) is 3.5-4.5 mm, and the distance between the auxiliary fire holes (42) and the main fire holes (41) adjacent to the auxiliary fire holes (42) along the center line of the fire row (2) is 1.2-1.4 mm.

6. A sub-low NOx burner according to claim 5, wherein the group of strong fire holes (4a) is arranged at the middle front end of the fire row (2) and the group of weak fire holes (4b) is arranged at the tail end of the fire row (2).

7. A sub-low NOx burner as claimed in claim 6, characterised in that there are 9 groups of strong fire hole groups (4a) and 7 groups of weak fire hole groups (4b), and that there are 4 main fire holes (41) symmetrically arranged between the areas of the strong fire hole groups (4a) and the weak fire hole groups (4b), 2 on each side of the fire row (2).

8. Sub-low NOx burner according to claim 1, characterized in that the gas distribution pipe (3) is connected to the gas inlet (5), and the gas distribution pipe (3) is provided with nozzles, which are connected to the fire row (2).

9. Sub-low NOx burner according to claim 8, characterized in that the main body (1) is further provided with a secondary air distribution plate (6), the secondary air distribution plate (6) being provided with a plurality of air distribution holes (61).

10. The sub-low NOx burner according to claim 1, characterized in that the main body (1) is further provided with a front bracket (7) and a rear bracket (8), the front bracket (7) is used for fixing the fire row (2) and the gas distribution pipe (3), and the rear bracket (8) is used for fixing the fire row (2); the fire rows (2) are at a distance of 13-14 mm, and secondary air channels (9) are further arranged between the fire rows (2).