CN115585452A - Low-nitrogen burner and flue heating device - Google Patents

Abstract

The invention belongs to the technical field of burners and discloses a low-nitrogen burner and a flue heating device. The low-nitrogen combustor comprises a joint, a nozzle and a flame stabilizing plate, wherein the joint is communicated with a fuel source and can be fixed in a flue; the nozzle is communicated with the joint and can spray flame into the flue; the flame stabilizing plate comprises a base plate and two bending plates which are oppositely arranged at two ends of the base plate, the base plate is arranged on the joint, the bending plates comprise a first folded plate, a second folded plate and a third folded plate which are sequentially connected, the first folded plate is arranged on the base plate, the third folded plate extends towards the air injection direction of the nozzle, and air holes are formed in the first folded plate and/or the second folded plate. The low-nitrogen combustor can stably spray flame and burn in the flue, is not influenced by the air flow speed in the flue, continuously and stably works, and has an outstanding effect of inhibiting the generation of nitrogen oxides.

Description

Low-nitrogen burner and flue heating device

Technical Field

The invention relates to the technical field of burners, in particular to a low-nitrogen burner and a flue heating device.

Background

The burner is an important device on industrial oil-fired boilers and gas-fired boilers, can ensure stable ignition combustion of fuel and complete combustion of fuel, and can also inhibit the generation of nitrogen oxides.

The burner used for heating the flue in the prior art is complex in structure and large in size, and is difficult to operate when being installed in the flue for operators, the burner is also complex in operation control after being installed, and the later maintenance is inconvenient. Meanwhile, in the burner used for heating the flue in the prior art, the flame sprayed out by the burner is unstable due to overlarge air speed in the flue and large air intake regulation deviation, and the temperature of the local structure of the burner is abnormal, so that the safe operation of the device is influenced, and the working effect of the burner is also influenced.

With the increasing environmental requirements, higher requirements are also put on the emission of nitrogen oxides, which requires that the burner must operate continuously and stably in the flue. Therefore, there is a need to improve the prior art to enable the combustor in the flue to stabilize combustion in abnormal wind speed conditions and reduce nox emissions.

Disclosure of Invention

The invention aims to provide a low-nitrogen burner which can stably perform flame combustion in a flue, is not influenced by the flow speed of air in the flue, can continuously and stably operate and has remarkable effect of inhibiting the generation of nitrogen oxides.

In order to achieve the purpose, the invention adopts the following technical scheme:

the low-nitrogen combustor comprises a joint, a nozzle and a flame stabilizing plate, wherein the joint is communicated with a fuel source and can be fixed in a flue; the nozzle is communicated with the joint and can spray flame into the flue; the flame stabilizing plate comprises a substrate and two bending plates which are oppositely arranged at two ends of the substrate, the substrate is arranged on the joint, the bending plates comprise a first folded plate, a second folded plate and a third folded plate which are sequentially connected, the first folded plate is arranged on the substrate, the third folded plate extends towards the air injection direction of the nozzle, and vent holes are formed in the first folded plate and/or the second folded plate.

Optionally, an included angle between the first folding plate and the air injection direction is alpha, and alpha is more than or equal to 45 degrees and less than or equal to 75 degrees; the included angle between the second folding plate and the air injection direction is beta, and beta is more than or equal to 105 degrees and less than or equal to 135 degrees; the included angle between the third folding plate and the air injection direction is gamma which is more than or equal to minus 10 degrees and less than or equal to 10 degrees.

Optionally, the first folding plate and the second folding plate are both provided with at least one row of the vent holes, and each row of the vent holes comprises a plurality of vent holes distributed at even intervals.

Optionally, the substrate is provided with a mounting hole, a sleeve is inserted into the mounting hole, and the nozzle is inserted into the sleeve.

Optionally, the substrate and the two bending plates are integrally formed.

It is a further object of the present invention to provide a flue heating apparatus comprising a plurality of low nitrogen burners as described in any one of the above aspects.

Optionally, the low-nitrogen gas burner further comprises a fuel main pipe communicated with the fuel source, the fuel main pipe is provided with a plurality of fuel sub-pipes in a communicating manner, the fuel sub-pipes are perpendicular to the outer wall of the flue and extend into the flue, and the fuel sub-pipes are provided with a plurality of low-nitrogen burners.

Alternatively, a plurality of the low-nitrogen burners on each of the fuel sub-pipes are arranged side by side, and the flame stabilizing plates of the plurality of the low-nitrogen burners on each of the fuel sub-pipes are connected in sequence.

Optionally, at least one of said low-nitrogen burners on each of said fuel sub-tubes is in communication with one of said low-nitrogen burners on an adjacent said fuel sub-tube.

Optionally, the low-nitrogen burner at the end of each fuel sub-pipe is communicated with the low-nitrogen burner at the end of the adjacent fuel sub-pipe, the bent plates of the two communicated low-nitrogen burners are connected with each other, and flame-blocking plates are arranged on both sides of the bent plates.

Has the advantages that:

the low-nitrogen burner provided by the invention sprays flame into the flue through the nozzle arranged on the joint so as to heat the flue, and the joint is communicated with a fuel source so as to provide fuel for the nozzle; the flame stabilizing plate is covered on the periphery of the nozzle through a first folded plate, a second folded plate and a third folded plate which are sequentially connected, and the third folded plate extends towards the air injection direction of the nozzle, so that the flame in the flame stabilizing plate can be prevented from being influenced by high-speed air flow in a flue, and the flame stabilizing plate plays a role in stabilizing the flame; meanwhile, the first folding plate and/or the second folding plate are/is provided with vent holes, the vent holes can provide air in the flue for flame sprayed by the nozzle, so that the effect of supporting combustion is achieved, the nozzle can continuously and stably spray flame and heat smoke in the flue, the operation of the nozzle is not influenced by the air flow rate in the flue, and the effect of remarkably inhibiting generation of nitrogen oxides is achieved.

Drawings

FIG. 1 is an isometric view of a low-nitrogen combustor provided by an embodiment of the invention;

FIG. 2 is a cross-sectional view of a flame stabilizing plate provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a flue heating apparatus according to an embodiment of the present invention mounted on a flue;

fig. 4 is a partially enlarged view of a portion a in fig. 3.

In the figure:

10. a low-nitrogen burner; 11. a flame barrier; 20. a fuel header; 21. a fuel sub-tube; 101. a flue;

100. a joint; 200. a nozzle; 310. a substrate; 311. a sleeve; 320. a bending plate; 321. a first folded plate; 322. a second folded plate; 323. a third folded plate; 330. and (4) a vent hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The low-nitrogen burner 10 in this embodiment is placed in the flue 101, and the flame sprayed by the low-nitrogen burner 10 heats the flue gas in the flue 101, so that when the hot flue gas flows into the downstream boiler, the hot flue gas can be sufficiently combusted with the fuel in the boiler, thereby reducing the generation of nitrogen oxides in the boiler.

Referring to fig. 1, in the present embodiment, the low-nitrogen burner 10 includes a joint 100, a nozzle 200 and a flame stabilizing plate, the joint 100 is disposed in communication with a fuel source, and the joint 100 can be fixed in a flue 101; the nozzle 200 is communicated with the joint 100, and the nozzle 200 can spray flame into the flue 101; the flame stabilizing plate includes a base plate 310 and two bending plates 320 oppositely disposed at both ends of the base plate 310, the base plate 310 is mounted on the joint 100, the bending plates 320 include a first folding plate 321, a second folding plate 322 and a third folding plate 323 connected in sequence, the first folding plate 321 is mounted on the base plate 310, the third folding plate 323 extends toward the air injection direction of the nozzle 200, and the first folding plate 321 and/or the second folding plate 322 are provided with vent holes 330.

The low-nitrogen burner 10 in this embodiment injects a flame into the flue 101 through a nozzle 200 mounted on the joint 100, thereby heating the flue 101, and the joint 100 is disposed in communication with a fuel source to supply the fuel to the nozzle 200; the flame stabilizing plate is covered on the periphery of the nozzle 200 through a first folded plate 321, a second folded plate 322 and a third folded plate 323 which are connected in sequence, and the third folded plate 323 extends towards the air injection direction of the nozzle 200, so that the flame in the flame stabilizing plate can be prevented from being influenced by high-speed airflow in the flue 101, and the flame stabilizing plate plays a role in stabilizing the flame; meanwhile, the first folding plate 321 and/or the second folding plate 322 are/is provided with vent holes 330, the vent holes 330 can provide air in the flue 101 for the flame sprayed by the nozzle 200, so that the function of supporting the flame is achieved, the nozzle 200 can continuously and stably spray the flame and heat the smoke in the flue 101, the operation of the nozzle 200 is not influenced by the change of the air flow rate in the flue 101, and the effect of remarkably inhibiting the generation of nitrogen oxides is achieved.

In this embodiment, the fuel source can provide natural gas as fuel, the flue 101 provides air as combustion improver, and the design of the flame stabilizing plate can make the nozzle 200 still obtain stable flame under abnormal fluctuation of wind speed, such as overlarge wind speed of the flue 101 or large deviation of regulation of intake air rate, and the combustion effect is better. The flame stabilizing plate designed in this way adopts a flue gas recirculation technology, combustion air enters a combustion area from the vent holes 330 on the flame stabilizing plate, and flue gas in the flue 101 can be pumped back to the flame spraying combustion area of the nozzle 200 by utilizing negative pressure, so that the peak temperature of flame in the combustion area is reduced, and the emission of nitrogen oxides is reduced.

Optionally, the first folding plate 321 and the second folding plate 322 are both provided with at least one row of the vent holes 330, and each row of the vent holes 330 includes a plurality of vent holes 330 uniformly distributed at intervals. In this embodiment, two rows of vent holes 330 are formed in the first folding plate 321, one row of vent holes 330 is formed in the second folding plate 322, and the plurality of rows of vent holes 330 enable the flame stabilizing plate to provide sufficient and stable air for the nozzle 200, so that flame is combusted, and the flame of the nozzle 200 is more stable. The number and arrangement of the ventilation holes 330 can be designed by those skilled in the art by computational fluid dynamics so that the flame shape and heat flux distribution of the nozzle 200 when it is fired can meet the requirements of the heating stack 101.

With continued reference to FIG. 2, in an embodiment, the first folding plate 321 forms an angle α with the air injection direction, i.e., the horizontal direction shown in FIG. 2, where α is greater than or equal to 45 ° and less than or equal to 75 °; the included angle between the second baffle 322 and the air injection direction is beta, and beta is more than or equal to 105 degrees and less than or equal to 135 degrees; the included angle between the third folding plate 323 and the air injection direction is gamma which is more than or equal to minus 10 degrees and less than or equal to 10 degrees. Specifically, the included angle between the first folding plate 321 and the air injection direction is 60 °, the included angle between the second folding plate 322 and the air injection direction is 120 °, and the included angle between the third folding plate 323 and the air injection direction is 0 °. The flame stabilizing plate thus configured can provide an optimal flame stabilizing effect to the nozzle 200, and in other alternative embodiments, the specific bending angle of the flame stabilizing plate may be designed by those skilled in the art by using a computational fluid dynamics method according to actual working conditions, so that the flame and combustion are more stable.

Alternatively, the base plate 310 may have a mounting hole, a sleeve 311 may be inserted into the mounting hole, and the nozzle 200 may be inserted into the sleeve 311. Further, the sleeve 311, the substrate 310 and the two bending plates 320 are integrally formed. The nozzle 200 is fittingly mounted to the mounting hole of the base plate 310 through the sleeve 311, and a sealing member is provided at the fittingly mounted position of the nozzle 200 and the sleeve 311. The integrally formed substrate 310 and the bending plate 320 make the manufacture of the flame stabilizing plate simpler and more convenient, thereby reducing the production cost.

The dimensional parameters of the low-nitrogen burner 10 in the present embodiment are described in detail below, where the diameter of the nozzle 200 in the low-nitrogen burner 10 is Φ 21.5mm, the projection of the flame stabilizing plate along the horizontal direction is a rectangle of 160mm × 160mm, and the thickness of the flame stabilizing plate is 5mm, where a mounting hole is formed in the middle of the substrate 310, two sides of the substrate 310 extend 10mm toward the air injection direction of the nozzle 200, and the projection length of the entire substrate 310 in the vertical direction is 36mm; the projection length of the first folding plate 321 in the vertical direction is 35mm, and the included angle between the first folding plate 321 and the air injection direction is 60 degrees; the projection length of the second folding plate 322 in the vertical direction is 27mm, the included angle between the second folding plate 322 and the air injection direction is 120 degrees, the length of the third folding plate 323 in the horizontal direction is 100mm, the included angle between the third folding plate 323 and the air injection direction is 0 degree, and the projection length of the whole flame stabilizing plate in the horizontal direction is 118.5mm; further, two rows of vent holes 330 are distributed on the first folding plate 321 in the flame stabilizing plate, each row comprises 8 vent holes 330 with the diameter of 8mm, a row of vent holes 330 is distributed on the second folding plate 322, and 8 vent holes 330 with the diameter of 8mm are distributed.

Referring to fig. 3 and 4, the present embodiment further provides a flue heating apparatus, which includes a plurality of low-nitrogen burners 10 according to any of the above aspects. The low-nitrogen burner 10 of the flue heating device can provide a stable and continuous flame, can stably heat flue gas in the flue 101 without being affected by the change of the air flow rate in the flue 101, and has a more excellent effect of suppressing the generation of nitrogen oxides.

As shown in fig. 3, the flue heating apparatus further includes a fuel main pipe 20 communicating with the fuel source, the fuel main pipe 20 is provided with a plurality of fuel sub-pipes 21, the fuel sub-pipes 21 are perpendicular to the outer wall of the flue 101 and extend into the flue 101, and the plurality of low-nitrogen burners 10 are mounted on the fuel sub-pipes 21. According to the flue heating device arranged in the way, the low-nitrogen combustor 10 is independently provided with fuel by the plurality of fuel sub-pipes 21, the plurality of fuel sub-pipes 21 are not affected mutually, and only the fuel sub-pipe 21 needs to be detached when one fuel sub-pipe 21 needs to be maintained, so that the maintenance efficiency is improved, and the maintenance cost is reduced.

Alternatively, a plurality of the low-nitrogen burners 10 on each of the fuel sub-pipes 21 are arranged side by side, and the flame stabilizing plates of the plurality of the low-nitrogen burners 10 on each of the fuel sub-pipes 21 are connected in sequence. In this embodiment, the plurality of flame stabilizing plate wings are sequentially spliced, welded and fixed, or may be integrally formed, and this embodiment is not particularly limited; a plurality of low NOx burner 10 that set up side by side connect gradually through steady flame board, form a combustion channel on a fuel sub-pipe 21, play the effect of igniting each other between each row of low NOx burner 10, can be when one of them low NOx burner 10 extinguishes, utilize the flame of adjacent low NOx burner 10 to reburn again, make flue heating device work more reliable and more stable, and still only need set up an ignition on a fuel sub-pipe 21 can, simplify flue heating device's structure, and the production cost is reduced. The ignition device may be an arc igniter, and is preferably disposed on the low-nitrogen burner 10 at the head end of the fuel sub-pipe 21, and the present embodiment is not particularly limited.

Optionally, at least one of the low-nitrogen burners 10 on each of the fuel sub-pipes 21 is disposed in communication with one of the low-nitrogen burners 10 on an adjacent fuel sub-pipe 21. Two adjacent low NOx burner 10 that communicate from top to bottom set up can ignite each other, form a flame-leading passageway, make all low NOx burner 10 on two adjacent fuel sub-pipes 21 from top to bottom can share an ignition, specific ignition can adjust according to actual need, only need to one of them low NOx burner 10 light a fire can, flame can propagate to the low NOx burner 10 on the adjacent fuel sub-pipe 21 from top to bottom along the flame-leading passageway, thereby simplify the requirement of flue heating device to ignition system, and make flue heating device ignition operation simpler, it is convenient, do benefit to this flue heating device's on-the-spot practical application and operation.

Further, the low-nitrogen burner 10 at the end of each fuel sub-pipe 21 is communicated with the low-nitrogen burner 10 at the end of the adjacent fuel sub-pipe 21, the bent plates 320 of the two communicated low-nitrogen burners 10 are connected to each other, and flame-blocking plates 11 are disposed on both sides of the bent plates 320. Referring to fig. 4, the bending plates 320 of two adjacent low-nitrogen burners 10 are connected together at the end of the fuel sub-pipe 21, specifically, the third bending plate 323 is bent to be vertical, so that the two adjacent third bending plates 323 are located on a same plane, and of course, the two adjacent third bending plates 323 can be integrally formed, thereby further simplifying the manufacturing process; the flame blocking plates 11 are welded to the left and right sides of the bent third folding plate 323, so that a flame guide channel is formed between two vertically adjacent low-nitrogen burners 10, thereby facilitating the vertical propagation of flame.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A low-nitrogen combustor, comprising:

a joint (100), the joint (100) being arranged in communication with a fuel source, the joint (100) being securable within a flue (101);

the nozzle (200), the said nozzle (200) is set up on the said piecing (100) in connection, the said nozzle (200) can spray the flame into the said flue (101);

the flame stabilizing plate comprises a base plate (310) and two bending plates (320) arranged at two ends of the base plate (310) relatively, the base plate (310) is installed on the joint (100), the bending plates (320) comprise a first folding plate (321), a second folding plate (322) and a third folding plate (323) which are connected in sequence, the first folding plate (321) is installed on the base plate (310), the third folding plate (323) faces to the air injection direction of the nozzle (200) in an extending mode, and vent holes (330) are formed in the first folding plate (321) and/or the second folding plate (322).

2. The low-nitrogen burner of claim 1, wherein the first flap (321) is angled from the gas injection direction by an angle α,45 ° ≦ α ≦ 75 °; an included angle between the second baffle (322) and the air injection direction is beta, and beta is more than or equal to 105 degrees and less than or equal to 135 degrees; the included angle between the third folding plate (323) and the air injection direction is gamma, which is more than or equal to-10 degrees and less than or equal to 10 degrees.

3. The burner of claim 1, wherein the first flap (321) and the second flap (322) each have at least one row of the ventilation holes (330), and each row of the ventilation holes (330) comprises a plurality of ventilation holes (330) uniformly spaced apart from each other.

4. The low-nitrogen burner of claim 1, wherein the base plate (310) is provided with a mounting hole, a sleeve (311) is inserted in the mounting hole, and the nozzle (200) is inserted in the sleeve (311).

5. The low-nitrogen burner of any one of claims 1 to 4, wherein the base plate (310) is integrally formed with the two bent plates (320).

6. Flue heating installation, characterized in that it comprises a plurality of low-nitrogen burners (10) according to any one of claims 1 to 5.

7. The flue heating device according to claim 6, further comprising a fuel main pipe (20) communicated with the fuel source, wherein a plurality of fuel sub-pipes (21) are communicated with the fuel main pipe (20), the fuel sub-pipes (21) are perpendicular to the outer wall of the flue (101) and extend into the flue (101), and a plurality of low-nitrogen burners (10) are mounted on the fuel sub-pipes (21).

8. Flue heating device according to claim 7, wherein a plurality of said low-nitrogen burners (10) on each said fuel sub-pipe (21) are arranged side by side, and said flame stabilizing plates of a plurality of said low-nitrogen burners (10) on each said fuel sub-pipe (21) are connected in series.

9. Flue heating apparatus according to claim 8, wherein at least one of said low nitrogen burners (10) on each of said fuel sub-pipes (21) is placed in communication with one of said low nitrogen burners (10) on an adjacent said fuel sub-pipe (21).

10. Flue heating device according to claim 9, wherein the low-nitrogen burners (10) on the end of each fuel sub-pipe (21) are arranged in communication with the low-nitrogen burners (10) on the end of the adjacent fuel sub-pipe (21), the bent plates (320) of the two low-nitrogen burners (10) arranged in communication are connected to each other, and flame shields (11) are arranged on both sides of the bent plates (320).

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