Natural ventilation low-nitrogen combustor suitable for negative pressure hearth

Abstract

The utility model relates to the technical field of combustion equipment, and discloses a natural ventilation low-nitrogen combustor suitable for a negative pressure hearth. Comprising a flame stabilizing disc, a central mixing pipe, a mixing injection spray head, a central gas pipe, a central fire gathering cover, a burner shell, a peripheral injection pipe, a central gas inlet, a peripheral gas inlet, a central mixing spray pipe, a spinning disk sleeve, a central gas branch pipe and a spinning disk, and the central gas pipe and the central fire gathering cover are welded to the center of the flame stabilizing disc; and the center fuel is graded again, so that the stability of the center flame is improved. According to the utility model, fuel grading is realized, so that the emission of nitrogen oxides can be reduced, the combustion can be more sufficient, the sufficient combustion of central fuel is ensured, and central flame is kept stable by re-grading the central fuel gas, so that the whole combustor is more stable in operation, and the combustion efficiency is improved. And the performance and the environmental protection property of the burner are comprehensively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to combustion equipment technical field especially suitable for natural draft low nitrogen combustor of negative pressure hearth. BACKGROUND

[0002] With the high speed development of petroleum industry furnace combustor combustion technology and the increasing environmental protection requirement, both need to ensure that industrial combustor meets energy saving effect under stable combustion, and also need to reduce pollutant (NOx) emission to achieve the effect of emission reduction. Therefore, the existing natural draft combustor needs to be improved to meet the needs of stable combustion, energy saving, low emission and the like.

[0003] Natural draft combustor relies on a natural draft to realize fuel and air mixing, does not need additional power equipment, saves energy and reduces use cost. However, natural draft combustor also faces some important problems, such as low combustion efficiency, high pollutant emission, obvious safety hidden danger, sensitive to environmental conditions and the like. Therefore, in order to solve the above problems, the utility model uses optimization air-fuel mixing technology, fuel staging technology and the like, improves combustor head design, enhances air and gas mixing, improves combustion stability, and reduces nitrogen oxide emission.

[0004] For this, aiming at the technical problem, the application proposes a natural draft low nitrogen combustor suitable for negative pressure hearth. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of natural draft low nitrogen combustors suitable for negative pressure hearth, which is to solve the shortcomings in prior art, and the combustor realizes by fuel staging, so that nitrogen oxide emission can be reduced, combustion can be more sufficient, and the central fuel is fully combusted, while the central gas is re-staged, so that the central flame remains stable, and the entire combustor is more stable, and the performance and environmental protection of the combustor are improved.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A natural ventilation low-nitrogen combustor suitable for a negative pressure furnace chamber, comprising a flame stabilizing disc, a center mixing pipe, a mixing ejection nozzle, a center gas pipe, a center fire cover, a combustor shell, a peripheral ejection pipe, a center gas inlet, a peripheral gas inlet, a center mixing nozzle, a swirl vane sleeve, a center gas branch pipe and swirl vanes, the center gas pipe is welded with the center fire cover and the flame stabilizing disc, the center fuel is reclassified, the stability of the center flame is increased, and the combustion is more stable, the center mixing nozzle is welded with the center gas chamber of the combustor shell, the center gas chamber is connected with the center gas inlet, the center mixing nozzle extends into the center mixing pipe, a plurality of center gas branch pipes are arranged in the center mixing nozzle, the swirl vane sleeve is welded at the tail of the center mixing nozzle, a plurality of swirl vanes are welded on the swirl vane sleeve, so that the fuel and air are fully mixed, and the mixing ejection nozzle is welded at the tail of the center mixing pipe, the peripheral ejection pipe is welded with the peripheral ejection combustion chamber of the combustor shell, and the peripheral ejection combustion chamber is welded with the peripheral gas inlet.

[0008] Further, the center mixing pipe is 2-6.

[0009] Further, the center mixing nozzle is 2-6.

[0010] Further, the center gas branch pipe is 2-6.

[0011] Further, the swirl vane is 8-20.

[0012] Further, the center fire cover opening is 6-12.

[0013] Further, the mixing ejection nozzle is circular 20-40 or rectangular 15-25.

[0014] Further, the peripheral ejection pipe is 3-8.

[0015] Further, the flame stabilizing disc opening is 3-7.

[0016] The utility model has the advantages of the following beneficial effects:

[0017] 1、The utility model discloses a combustor, which realizes fuel classification, divides the injected fuel into peripheral ejection gas, center mixing gas injection and center gas injection, reduces the emission of nitrogen oxides, and makes the combustion more sufficient.

[0018] 2、The utility model discloses a combustor, which realizes the mixing of center fuel and air in the center mixing pipe, and sets a plurality of swirl vanes at the center pipe closing position to promote the sufficient mixing of air-gas, so that the center fuel is fully burned.

[0019] 3. The utility model discloses, realized through the center gas reclassification, set up center gas pipe, and set up the fire screen in the center gas pipe tail portion, make the center flame stable, make the burner operation more stable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure diagram of a natural ventilation low-nitrogen combustor suitable for a negative pressure hearth is provided for the utility model;

[0021] Figure 2 The lower view of a natural ventilation low-nitrogen combustor suitable for a negative pressure hearth is provided for the utility model;

[0022] Figure 3 For Figure 2 Corresponding sectional view;

[0023] Figure 4 The rear view of a natural ventilation low-nitrogen combustor suitable for a negative pressure hearth is provided for the utility model.

[0024] Legend:

[0025] 1, flame stabilizing disc; 2, center mixing pipe; 3, mixed ejection nozzle; 4, center gas pipe; 5, center fire screen; 6, combustor shell; 7, peripheral ejection pipe; 8, center gas inlet; 9, peripheral gas inlet; 10, center mixing nozzle; 11, cyclone sheet sleeve; 12, center gas branch pipe; 13, cyclone sheet. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0027] Refer to Figures 1-3The utility model provides a kind of embodiment: a kind of natural ventilation low-nitrogen combustor suitable for negative pressure hearth, including combustor shell 6, gas injection, gas-air mixing section and center gas section, combustor shell 6 respectively welds center gas import 8 and peripheral gas import 9 outward, and sets up center fuel chamber and peripheral injection fuel chamber, the peripheral injection pipe 7 of gas injection section is welded with the peripheral injection fuel chamber of combustor shell 6, injects peripheral gas, the center mixing nozzle 10 of gas-air mixing section is welded with the center fuel chamber of combustor shell 6, center mixing nozzle 10 connects center gas branch pipe 12, cyclone piece sleeve 11 and cyclone piece 13, and extends into center mixing pipe 2, center mixing pipe 2 welds mixing injection head 3, center gas section is composed of center gas pipe 4, center fire screen 5, flame stabilizer 1;Center gas-air mixing section includes center gas import 8, center gas import 8 is welded with the center fuel chamber of combustor shell 6, the inboard of center fuel chamber is welded with center mixing nozzle 10, center mixing nozzle 10 middle part welds several center gas branch pipe 12, for injecting gas, and it is mixed with air in center mixing pipe 2, while welding cyclone piece sleeve 11 at the rear end of center mixing nozzle 10, and weld several cyclone pieces 13 on cyclone piece sleeve 11, so that fuel and air mix fully, and fuel and air that mix fully are injected at mixing injection head 3, reduce combustion temperature to a certain extent, achieve low-nitrogen effect;Center gas section includes center gas section by center gas pipe 4, center fire screen 5 and flame stabilizer 1, center gas pipe 4 tail welds center fire screen 5, and is welded with flame stabilizer 1, divides center gas again, so that center flame stable combustion, promote the stability of combustor operation;Peripheral injection section includes peripheral injection pipe 7, peripheral injection pipe 7 is welded on the peripheral injection fuel chamber of combustor shell 6, and contraction mouth is provided to peripheral injection pipe 7, improve the injection speed of peripheral fuel, so that flame combustion is more dispersed, reduce the temperature at center flame, reduce the emission of nitrogen oxides;Due to the effect of gas staging, air-gas mixing and dense and thin combustion and other nitrogen reduction technologies, form two kinds of flames, respectively center flame and peripheral diffusion flame, can realize complete combustion under the best excess air ratio, so that the amount of nitrogen oxides is very low.

[0028] Working principle: the burner shell 6 is respectively welded with the center gas inlet 8 and the peripheral gas inlet 9, and is provided with a center fuel chamber and a peripheral fuel ejection chamber, the peripheral ejection pipe 7 of the gas ejection section is welded with the peripheral fuel ejection chamber of the burner shell 6 to inject the peripheral gas, the center mixing nozzle 10 of the gas-air mixing section is welded with the center fuel chamber of the burner shell 6, the center mixing nozzle 10 is connected with the center gas branch pipe 12, the swirl vane sleeve 11 and the swirl vane 13 and extends into the center mixing pipe 2, the center mixing pipe 2 is welded with the mixing ejection head 3, the center gas inlet 8 is welded with the center fuel chamber of the burner shell 6, the inner side of the center fuel chamber is welded with the center mixing nozzle 10, 2-6 center gas branch pipes 12 are welded in the middle of the center mixing nozzle 10 to inject the gas and mix with the air in the center mixing pipe 2, at the same time, the swirl vane sleeve 11 is welded at the rear end of the center mixing nozzle 10 and 8-20 swirl vanes 13 are welded on the swirl vane sleeve 11 to make the fuel and air mix fully, the fuel and air mixed fully are injected at the mixing ejection head 3 (circular 20-40, rectangular 15-25) to reduce the combustion temperature and realize the low nitrogen effect, the tail of the center gas pipe 4 of the center gas section is welded with the center flame hood 5 (the opening is 6-12) and is welded with the flame stabilizing disc 1 (the opening is 3-7) to make the center gas stage again to make the center flame stable combustion and promote the stability of the burner operation, the peripheral ejection pipe 7 (3-8) of the peripheral ejection section is welded on the peripheral fuel ejection chamber of the burner shell 6 and is provided with a contraction opening to improve the peripheral fuel injection speed, make the flame combustion more dispersed, reduce the temperature at the center flame and reduce the nitrogen oxide emission, under the action of the gas staging, air-gas mixing and dense-thin combustion and other nitrogen reduction technologies, the center flame and the peripheral diffusion flame are formed to realize the complete combustion under the best excess air coefficient and reduce the nitrogen oxide generation amount.

[0029] Finally, it should be pointed out that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A natural draft low NOx burner suitable for use in a negative pressure furnace, comprising a flame holder plate (1), a central mixing tube (2), a mixing and ejection nozzle (3), a central gas tube (4), a central damper (5), a burner shell (6), a peripheral ejection tube (7), a central gas inlet (8), a peripheral gas inlet (9), a central mixing nozzle (10), a swirl vane sleeve (11), a central gas branch tube (12), and a swirl vane (13), characterized in that: The center gas pipe (4) is welded with the center flame cover (5) and the flame stabilizing disc (1) in the center, which makes the center fuel re-stage, increases the stability of the center flame and makes the combustion more stable. The center mixing nozzle (10) is welded with the center gas chamber of the burner shell (6), the center gas chamber is connected with the center gas inlet (8), the center mixing nozzle (10) extends into the center mixing pipe (2), a plurality of center gas branch pipes (12) are arranged in the center mixing nozzle (10), the tail of the center mixing nozzle (10) is welded with the swirl vane sleeve (11), a plurality of swirl vanes (13) are welded on the swirl vane sleeve (11), which makes the fuel and air fully mixed, and the tail of the center mixing pipe (2) is welded with the mixing and ejecting nozzle (3). The peripheral ejecting pipe (7) is welded with the peripheral ejecting combustion chamber of the burner shell (6), and the peripheral ejecting combustion chamber is welded with the peripheral gas inlet (9).

2. A natural draft low NOx burner suitable for use in a negative pressure furnace according to claim 1, characterized in that: The center mixing pipe (2) is 2-6.

3. A natural draft low NOx burner suitable for use in a negative pressure furnace according to claim 1, characterized in that: The center mixing nozzle (10) is 2-6.

4. A natural draft low NOx burner suitable for use in a negative pressure furnace according to claim 1, characterized in that: The center gas branch pipe (12) is 2-6.

5. A natural draft low NOx combustor for a negative pressure furnace according to claim 1, characterized in that: The swirl vane (13) is 8-20.

6. A natural draft low NOx combustor for a negative pressure furnace according to claim 1, characterized in that: The center flame cover (5) has 6-12 openings.

7. A natural draft low NOx burner suitable for use in a negative pressure furnace as defined in claim 1, wherein: The mixing and ejecting nozzle (3) has 20-40 circles or 15-25 rectangles.

8. A natural draft low NOx combustor for a negative pressure furnace according to claim 1, characterized in that: The peripheral ejecting pipe (7) is 3-8.

9. A natural draft low NOx combustor for a negative pressure furnace according to claim 1, characterized in that: The flame stabilizing disc (1) has 3-7 openings.

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