CN216431714U

CN216431714U - Combustion head with flue gas internal circulation ultralow nitrogen NOx content less than or equal to 50mg

Info

Publication number: CN216431714U
Application number: CN202123097720.9U
Authority: CN
Inventors: 谢国振; 赖涛; 沈晓丰
Original assignee: Olympia Energy Saving Technology Zhangzhou Co ltd
Current assignee: Olympia Energy Saving Technology Zhangzhou Co ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-05-03
Anticipated expiration: 2031-12-10

Abstract

The utility model belongs to the technical field of burners, in particular to a flue gas internal circulation ultra-low nitrogen NOx combustion head which is less than or equal to 50mg, a flue gas external circulation recovery pipeline is added aiming at the existing equipment installation, the flue gas recovery generates condensed water, the equipment shell is corroded, and the problem of large combustion fluctuation is solved; the air inlet branch pipe is arranged on the outer wall of one side of the air inlet shell; and the gas branch pipe is arranged on one side of the gas inlet branch pipe in parallel. The utility model discloses adjust and distribute once more wind and overgrate air wind speed, make the sufficiency of flame detection, burning obtain guaranteeing, can reduce the NOx in the tail gas that burns below 50mg, the burning is stable, does not burn the shake, and equipment fixing is convenient, need not to add the flue gas extrinsic cycle pipeline, and NOx reduces and realizes energy saving and emission reduction, and is economical and practical, and equipment is simple, makes its control system with low costs, and the debugging is convenient.

Description

Combustion head with flue gas internal circulation ultralow nitrogen NOx content less than or equal to 50mg

Technical Field

The utility model relates to a combustor technical field especially relates to a flue gas inner loop is ultralow nitrogen NOx and is less than or equal to 50mg burning head.

Background

At present, in order to realize the emission of ultralow nitrogen NOx which is less than or equal to 50mg, the combustor mainly adopts the technologies of classification, flame segmentation, premixing, FGR and the like, and a flue gas external circulation (FGR) recovery pipeline needs to be added during equipment installation, so that flue gas recovery generates a lot of condensed water, the corrosion to an equipment shell is great, the combustion fluctuation is large, the combustion is unstable, particularly, the recovery amount of the flue gas is different in winter and summer, and a lot of equipment needs to be debugged again.

FGR brings great inconvenience to equipment installation, meanwhile, the system has very high control precision requirement on the recycling amount of the flue gas external circulation, the requirement on debugging and assembling precision is directly high, great difficulty is caused to debugging, the debugging experience of debugging personnel is required to be very high, the debugging personnel has very strong field treatment level, in addition, the requirements on the precision of parts and the level of the assembling personnel are also very high, otherwise, the product cannot achieve the designed combustion effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art, and providing a flue gas internal circulation ultra-low nitrogen NOx combustion head which is less than or equal to 50 mg.

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

a flue gas internal circulation ultra-low nitrogen NOx combustion head less than or equal to 50mg comprises an air inlet shell; the air inlet branch pipe is arranged on the outer wall of one side of the air inlet shell; the gas branch pipe is arranged on one side of the gas inlet branch pipe in parallel, and the end part of the gas branch pipe is led to the inside of the air inlet shell; the primary combustion head is arranged at the end part of the air inlet shell, secondary gas spray pipes are annularly connected to the periphery of the primary combustion head at equal intervals, a flame protection plate is arranged at the end part of the air inlet shell, and secondary air gas premixing pipes corresponding to the secondary gas spray pipes are annularly distributed on the inner wall of the flame protection plate at equal intervals; the primary combustion head is of a double-layer structure, the air inlet branch pipe is communicated with a through groove in the middle of the primary combustion head, the gas branch pipe is communicated with the interlayer cavity of the primary combustion head, and the interlayer cavity is communicated with the flame-proof plate and the secondary gas spray pipe;

the inner wall of the flame protection plate is vertically provided with a pilot fire nozzle, the end part of the pilot fire nozzle is connected with a pilot fire gas inlet pipe, and the inner side of the air inlet shell, which is close to the pilot fire nozzle, is provided with an ignition needle.

As a further proposal of the utility model, the end part of the secondary air and gas premixing pipe is communicated with the air inlet branch pipe end.

As a further proposal of the utility model, the interlayer cavity is communicated to the junction of the flame-proof plate to be provided with a one-level gas nozzle.

As a further proposal, the middle part of the gas of the one-level gas nozzle and the one-level combustion head is communicated with the surface of the flame-proof plate through the air mixing.

The utility model has the advantages that:

the combustion head adopts flame segmentation used under the requirement that NOx is less than or equal to 50mg, and introduces a smoke internal circulation technology (FIR) after premixing and classification technology, so that smoke internal circulation is increased, the combustion temperature of flame in a furnace is reduced, the generation of thermal NOx and rapid NOx is inhibited, and the wind speed of primary air and secondary air is adjusted and distributed again at the same time, so that the flame detection and the combustion sufficiency are ensured, the NOx in combustion tail gas can be reduced to be less than 50mg, the combustion is stable, no combustion jitter exists, the equipment is convenient to install, no smoke external circulation pipeline needs to be added, the reduction of NOx realizes energy conservation and emission reduction, and the combustion head is economical and practical, has simple equipment, low cost of a control system and convenient debugging.

Drawings

FIG. 1 is a schematic diagram of a side view structure of a combustion head with an ultra-low nitrogen NOx in flue gas internal circulation less than or equal to 50mg provided by the utility model;

FIG. 2 is a schematic diagram of the A-A section structure of a combustion head with ultra-low nitrogen NOx in flue gas internal circulation less than or equal to 50mg provided by the utility model;

FIG. 3 is a schematic diagram of a B-B section structure of a combustion head with a flue gas internal circulation ultra-low nitrogen NOx less than or equal to 50mg provided by the utility model.

In the figure: 1. a pilot fire nozzle; 2. an ignition needle; 3. a flame protection plate; 4. a secondary air gas premix tube; 5. a secondary gas jet pipe; 6. a primary combustion head; 7. an air inlet housing; 8. an intake branch pipe; 9. a primary gas nozzle; 10. a secondary premixed gas nozzle; 11. and a gas branch 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, a flue gas internal circulation ultra-low nitrogen NOx combustion head less than or equal to 50mg comprises an air inlet shell 7; the air inlet branch pipe 8 is arranged on the outer wall of one side of the air inlet shell 7; the gas branch pipe 11 is arranged on one side of the gas inlet branch pipe 8 in parallel, and the end part of the gas branch pipe 11 is led to the inside of the air inlet shell 7; the primary combustion head 6 is arranged at the end part of the air inlet shell 7, the periphery of the primary combustion head 6 is annularly connected with secondary gas spray pipes 5 at equal intervals, the end part of the air inlet shell 7 is provided with a flame protection plate 3, and secondary air and gas premixing pipes 4 corresponding to the secondary gas spray pipes 5 are annularly distributed on the inner wall of the flame protection plate 3 at equal intervals; the primary combustion head 6 is of a double-layer structure, the air inlet branch pipe 8 is communicated with a through groove in the middle of the primary combustion head 6, the gas branch pipe 11 is communicated with an interlayer cavity of the primary combustion head 6, and the interlayer cavity is communicated with the flame-protection plate 3 and the secondary gas spray pipe 5; the inner wall of the flame protection plate 3 is vertically provided with a pilot burner nozzle 1, the end of the pilot burner nozzle 1 is connected with a pilot burner gas inlet pipe, the inner side of the air inlet shell 7 is provided with an ignition needle 2 near the pilot burner nozzle 1, the end of the secondary air and gas premixing pipe 4 is communicated with the end of the gas inlet branch pipe 8, the interlayer cavity is communicated to the joint of the flame protection plate 3 to form a primary gas nozzle 9, and the gas of the primary gas nozzle 9 is communicated with the surface of the flame protection plate 3 through the groove in the middle of the primary combustion head 6 through the air.

The working principle of the combustion head is as follows:

1. when the burner is used, the burner is connected with an air source through the air inlet branch pipe 8, the fuel gas branch pipe 11 is connected with a fuel gas end, fuel gas is input to the primary fuel gas nozzle 9 and the secondary fuel gas spray pipe 5 through a wall cavity of the primary burner 6, and air is input through a through hole in the middle of the primary burner 6;

2. the air and the gas on the surface of the flame protection plate 3 are mixed for the first time, the gas is ignited and combusted through a pilot fire end, meanwhile, the secondary gas spray pipe 5 and the mixed air enter the secondary air and gas premixing pipe 4, and the secondary combustion is realized on the outer wall of the flame protection plate 3;

3. the pressure difference effect of primary air and secondary air mixed by gas is utilized to suck the surface of the paper flame-protecting plate 3 by the burning smoke and add the burning smoke into the burning, and because the specific heat capacity of the smoke is higher and the oxygen content is lower, the central temperature of burning flame can be reduced, and the oxygen content is reduced at the same time, so that the formation of thermal NOx is reduced, and the total heat is kept unchanged.

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

1. The utility model provides a flue gas inner loop ultralow nitrogen NOx is less than or equal to 50mg burning head which characterized in that includes:

an air inlet housing (7);

the air inlet branch pipe (8), the air inlet branch pipe (8) is arranged on the outer wall of one side of the air inlet shell (7);

the gas branch pipes (11) are arranged on one side of the gas inlet branch pipe (8) in parallel, and the end parts of the gas branch pipes (11) are led to the inside of the air inlet shell (7);

the primary combustion head (6) is arranged at the end part of the air inlet shell (7), the periphery of the primary combustion head (6) is annularly connected with secondary gas spray pipes (5) at equal intervals, the end part of the air inlet shell (7) is provided with a flame protection plate (3), and secondary air and gas premixing pipes (4) corresponding to the secondary gas spray pipes (5) are annularly distributed on the inner wall of the flame protection plate (3) at equal intervals;

the primary combustion head (6) is of a double-layer structure, the air inlet branch pipe (8) is communicated with a through groove in the middle of the primary combustion head (6), the gas branch pipe (11) is communicated with an interlayer cavity of the primary combustion head (6), and the interlayer cavity is communicated with the flame-protection plate (3) and the secondary gas spray pipe (5);

the inner wall of the flame protection plate (3) is vertically provided with a pilot fire nozzle (1), the end part of the pilot fire nozzle (1) is connected with a pilot fire gas inlet pipe, and an ignition needle (2) is arranged on the inner side of the air inlet shell (7) close to the pilot fire nozzle (1).

2. The combustion head with the internal circulation of flue gas and ultra-low nitrogen NOx content less than or equal to 50mg as claimed in claim 1, wherein the end of the secondary air and gas premixing pipe (4) is communicated with the end of the air inlet branch pipe (8).

3. The burner head with the internal circulation of flue gas and the ultra-low nitrogen NOx content of less than or equal to 50mg as claimed in claim 1, wherein a first-stage gas nozzle (9) is arranged at the joint of the interlayer cavity communicated to the flame-protection plate (3).

4. The combustion head with the internal circulation of flue gas and the ultra-low nitrogen NOx content of less than or equal to 50mg as claimed in claim 3, wherein the fuel gas of the primary fuel gas nozzle (9) is mixed with the air in the middle through groove of the primary combustion head (6) to the surface of the flame holding plate (3).