CN216431711U - Ultra-low NOx emission burner combustion head for through-flow boiler - Google Patents

Abstract

The utility model belongs to the technical field of flue gas treatment, in particular to a combustion head of an ultra-low NOx emission combustor for a through-flow boiler, which aims at the problem of insufficient temperature regulation and control and provides the following scheme, comprising a flue gas pipe, wherein one end of the flue gas pipe is connected with an air inlet flange; the end part of the air inlet flame stabilizing cylinder is connected to one end, far away from the air inlet flange, of the flue gas pipe; the gas primary mixing pipe is symmetrically arranged on two sides of the bottom end of the gas inlet flame stabilizing cylinder, and the bottom end of the gas primary mixing pipe is connected with the mixing pipe. The utility model discloses in adopt the pressure differential effect of primary air and overgrate air, carry out the entrainment to the flue gas of burning, add the burning in the middle of, because the specific heat capacity ratio of flue gas is than higher to oxygen content ratio is lower, can reduce the central temperature of burning flame, reduces oxygen content simultaneously to this reduces the formation of heating power type NOx, total heat keeps unchangeable, improves the inhibit action to NOx's formation.

Description

Ultra-low NOx emission burner combustion head for through-flow boiler

Technical Field

The utility model relates to a technical field is handled to the flue gas, especially relates to a through-flow boiler discharges combustor burner with ultralow NOx.

Background

At present, the emission of ultralow nitrogen NOx which is less than or equal to 30 or 50mg is hardly realized for through-flow hot water and a steam boiler, the technologies such as grading/flame segmentation/premixing/+ FGR are mainly adopted, a flue gas external circulation (FGR) recovery pipeline needs to be added for equipment installation, much condensed water is generated during flue gas recovery, the corrosion to an equipment shell is very large (namely a drainage device is added), the combustion fluctuation is large and unstable, particularly, the recovery amount of the flue gas is different in winter and summer, and many pieces of equipment need to be debugged again.

FGR brings great inconvenience to equipment installation, and meanwhile, the system has very high control precision requirement on the recycling amount of the flue gas external circulation, which directly causes very high requirement on debugging and assembling precision, causes great difficulty to debugging, requires very high debugging experience of debugging personnel and has very strong field processing level.

An ultra-low nitrogen combustor burner head adjusting device as an authority publication No. CN212777324U discloses, including the regulating box, its characterized in that: and an adjusting device is arranged in the adjusting box. The adjusting device changes the supply of air and fuel gas through a mechanical structure to achieve the effect of adjusting the flame size of the burner, but another temperature factor generated by NOx cannot be well regulated, so that the burner of the ultra-low NOx emission burner for the through-flow boiler is provided to achieve the purposes of reducing the formation of thermal NOx and reducing the emission of NOx.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a burner head of a through-flow boiler with ultra-low NOx emission.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a burner head of an ultra-low NOx emission burner for a cross-flow boiler comprises a flue gas pipe, wherein one end of the flue gas pipe is connected with an air inlet flange; the end part of the gas inlet flame stabilizing cylinder is connected to one end, far away from the gas inlet flange, of the flue gas pipe; the gas primary mixing pipes are symmetrically arranged on two sides of the bottom end of the gas inlet flame stabilizing cylinder, and the bottom ends of the gas primary mixing pipes are connected with the mixing pipes; the outer walls of the air inlet flame stabilizing cylinder and the gas primary mixing pipe are sleeved with a combustion cylinder, the bottom end of the combustion cylinder is fixedly connected with a secondary air plate, the outer wall of the top of the secondary air plate is equidistantly and annularly distributed with secondary combustion cylinders, the outer wall of the mixing pipe is equidistantly and annularly connected with a premixing burner and a connecting pipeline, and the bottom end of the premixing burner is positioned inside the top end of the secondary combustion cylinder; a flame-proof plate is arranged outside the joint of the bottom end of the mixing pipe and the secondary air plate; the upper igniter and the lower igniter are arranged on two sides of the combustion cylinder, the lower igniter is arranged on the outer wall of the secondary air plate, a primary combustion nozzle is further arranged on the outer wall of the secondary air plate, the outer wall of the primary combustion nozzle is fixedly connected with the lower igniter through a support, and the lower igniter is used for igniting primary fire of the primary combustion nozzle; the outer wall of the flue gas pipe is provided with an upper partition plate, and the upper igniter is arranged on the outer wall of the upper partition plate.

As a further proposal of the utility model, the outer wall of the combustion cylinder is fixedly connected with a heat insulation board.

As a further aspect of the present invention, the top end of the combustion cylinder is of an open structure, and the combustion cylinder is introduced into the interior of the air inlet mixing tube and the secondary combustion cylinder.

As a further aspect of the present invention, the mixing tube is of a double-layer structure, and the side wall of the mixing tube leaves a cavity, the side wall cavity of the mixing tube is linked with the gas one-time mixing tube.

As a further scheme of the utility model, air inlet flange one end lets in the gas, and the gas loops through the outside cavity to the flame board output of the flame stabilizing section of thick bamboo, the gas primary mixing pipe of admitting air and hybrid tube.

The beneficial effects of the utility model are that:

the combustion head adopts flame segmentation and premixing and grading technologies used under the requirement that NOx is less than or equal to 50mg, introduces a smoke internal circulation technology (FIR), increases smoke internal circulation, reduces the combustion temperature of flame in a furnace, inhibits the generation of thermal NOx and rapid NOx, readjusts and distributes the wind speed of primary air and secondary air to ensure that the flame detection and the combustion sufficiency reach better effects, reduces the NOx in combustion tail gas to be less than 50mg, has stable combustion and no combustion jitter, is convenient to install, does not need to add a smoke external circulation pipeline, saves energy, reduces emission, is economical and practical, has low control system cost and is convenient to debug;

the combustion head mainly carries out primary and secondary combustion, simultaneously carries out the proportion of primary air and secondary air to achieve reasonable combustion equivalent, but cannot meet the requirement of environmental emission that NOx is less than or equal to 50mg at the moment, and in order to achieve better combustion stability and emission numerical value, the pressure difference action of the primary air and the secondary air is adopted to entrain the combusted smoke and add the smoke into the combustion.

Drawings

FIG. 1 is a schematic perspective view of a burner head of an ultra-low NOx emission burner for a once-through boiler according to the present invention;

FIG. 2 is a schematic view of the internal structure of a combustion-removing barrel of a burner head of an ultra-low NOx emission burner for a through-flow boiler according to the present invention;

fig. 3 is a schematic view of the working effect of the burner head of the ultra-low NOx emission burner for the cross-flow boiler according to the present invention.

In the figure: 1. a flame protection plate; 2. a secondary air plate; 3. a premix burner; 4. a combustion can; 5. a heat insulation plate; 6. an air inlet flame stabilizing cylinder; 7. a primary burning nozzle; 8. a lower igniter; 9. an igniter is arranged; 10. a flue gas pipe; 11. an air inlet flange; 12. an upper partition plate; 13. a primary gas mixing pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-3, the burner head of the ultra-low NOx emission burner for the through-flow boiler comprises a flue gas pipe 10, wherein one end of the flue gas pipe 10 is connected with an air inlet flange 11; the end part of the gas inlet flame stabilizing cylinder 6 is connected to one end, far away from a gas inlet flange 11, of the flue gas pipe 10; the gas primary mixing pipes 13 are symmetrically arranged on two sides of the bottom end of the gas inlet flame stabilizing cylinder 6, and the bottom ends of the gas primary mixing pipes 13 are connected with the mixing pipes; the outer walls of the air inlet flame stabilizing cylinder 6 and the gas primary mixing pipe 13 are sleeved with a combustion cylinder 4, the bottom end of the combustion cylinder 4 is fixedly connected with a secondary air plate 2, the outer wall of the top of the secondary air plate 2 is annularly distributed with secondary combustion cylinders at equal intervals, the outer wall of the mixing pipe is annularly connected with a premixing burner 3 and a connecting pipeline at equal intervals, and the bottom end of the premixing burner 3 is positioned inside the top end of the secondary combustion cylinder; a flame-proof plate 1 is arranged outside the joint of the bottom end of the mixing pipe and the secondary air plate 2; the ignition device comprises an upper igniter 9 and a lower igniter 8, wherein the upper igniter 9 and the lower igniter 8 are arranged on two sides of the combustion cylinder 4, the lower igniter 8 is arranged on the outer wall of the secondary air plate 2, a primary combustion nozzle 7 is further arranged on the outer wall of the secondary air plate 2, the outer wall of the primary combustion nozzle 7 is fixedly connected with the lower igniter 8 through a support, and the lower igniter 8 is used for igniting primary fire of the primary combustion nozzle 7; the outer wall of flue gas pipe 10 is equipped with baffle 12, and go up igniter 9 and locate on the outer wall of baffle 12, the outer wall fixedly connected with heat insulating board 5 of a combustion section of thick bamboo 4, the top of a combustion section of thick bamboo 4 is open structure, and a combustion section of thick bamboo 4 lets in the inside that the air entered mixing tube and postcombustion section of thick bamboo, the mixing tube is bilayer structure, and the lateral wall of mixing tube leaves the cavity, be linked together between the lateral wall cavity of mixing tube and the first mixing tube 13 of gas, 11 one ends of air inlet flange let in the gas, and the gas loops through air inlet flame stabilizing section of thick bamboo 6, the outside cavity of the first mixing tube 13 of gas and mixing tube is to the output of flame holding plate 1.

The working principle of the burner head of the burner is as follows:

1. a flue gas pipe 10 in the combustion head is introduced with gas through a gas inlet flange 11, the gas is input into a gas inlet flame stabilizing cylinder 6 through the flue gas pipe 10, a gas primary mixing pipe 13 is divided into two paths, and the air input from the top end of a combustion cylinder 4 is mixed for the first time and is mixed in the mixing pipe;

2. a primary combustion burner 7 at the bottom is ignited by a lower igniter 8 to generate primary fire, a mixed gas and air mixture is combusted through the end of the flame-protection plate 1, the primary fire is communicated with an inner pipeline of the combustion cylinder 4, and meanwhile, mixed gas enters a secondary mixing pipe on the secondary air plate 2 through the pre-combustion burner 3 to be combusted secondarily;

3. the combustion cylinder 4 is internally provided with a pressure difference function of primary air and secondary air to entrain the combusted smoke and add the entrained smoke into combustion, and because the specific heat capacity of the smoke is high and the oxygen content is low, the central temperature of combustion flame can be reduced, and the oxygen content is reduced at the same time, so that the formation of thermal NOx is reduced, the total heat is kept unchanged, and the inhibiting effect on the formation of NOx is improved.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", "first", "second", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, 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 therefore should not be construed as limiting the present invention.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (5)

1. A burner head for an ultra low NOx emission burner for a once-through boiler, comprising:

one end of the flue gas pipe (10) is connected with an air inlet flange (11);

the end part of the air inlet flame stabilizing cylinder (6) is connected to one end, far away from the air inlet flange (11), of the flue gas pipe (10);

the primary gas mixing pipes (13) are symmetrically arranged on two sides of the bottom end of the gas inlet flame stabilizing cylinder (6), and the bottom ends of the primary gas mixing pipes (13) are connected with the mixing pipes;

the outer walls of the air inlet flame stabilizing cylinder (6) and the gas primary mixing pipe (13) are sleeved with a combustion cylinder (4), the bottom end of the combustion cylinder (4) is fixedly connected with a secondary air plate (2), the outer wall of the top of the secondary air plate (2) is annularly distributed with secondary combustion cylinders at equal intervals, the outer wall of the mixing pipe is annularly connected with premixing burners (3) and connecting pipelines at equal intervals, and the bottom ends of the premixing burners (3) are positioned inside the top end of the secondary combustion cylinder;

a flame protection plate (1) is arranged outside the joint of the bottom end of the mixing pipe and the secondary air plate (2);

the ignition device comprises an upper igniter (9) and a lower igniter (8), wherein the upper igniter (9) and the lower igniter (8) are arranged on two sides of a combustion cylinder (4), the lower igniter (8) is arranged on the outer wall of a secondary air plate (2), a primary combustion nozzle (7) is further arranged on the outer wall of the secondary air plate (2), the outer wall of the primary combustion nozzle (7) is fixedly connected with the lower igniter (8) through a support, and the lower igniter (8) is used for igniting primary fire of the primary combustion nozzle (7);

the outer wall of the flue gas pipe (10) is provided with an upper partition plate (12), and the upper igniter (9) is arranged on the outer wall of the upper partition plate (12).

2. The burner head of ultra-low NOx emission burner for once-through boiler according to claim 1, characterized in that the outer wall of the combustion can (4) is fixedly connected with a heat insulation plate (5).

3. The burner head of ultra-low NOx emission burner for through-flow boiler of claim 1, wherein the top end of the combustion can (4) is an open structure, and the combustion can (4) is ventilated with air into the mixing tube and the interior of the post-combustion can.

4. The burner head of ultra-low NOx emission burner for through-flow boiler according to claim 1, wherein the mixing tube has a double-layer structure, and a cavity is left on the side wall of the mixing tube, and the cavity on the side wall of the mixing tube is communicated with the primary gas mixing tube (13).

5. The burner head of the ultra-low NOx emission burner for the through-flow boiler according to claim 1, wherein gas is introduced into one end of the gas inlet flange (11), and the gas sequentially passes through the gas inlet flame stabilizing cylinder (6), the primary gas mixing pipe (13) and the outer cavity of the mixing pipe to be output to the flame holding plate (1).

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