CN214501221U - Duplex ultra low NOx burner - Google Patents

Abstract

The utility model relates to a compound ultralow NOx combustor, including combustor casing, flame path brick, central fire pan brick, changming lamp and multistage fuel air gun, central fire pan brick, flame path brick are located the top of combustor casing, central fire pan brick is established and is put at combustor casing central point, the flame path brick is established in central fire pan brick periphery, and central fire pan brick exceeds the flame path brick, be equipped with casing whirl device between central fire pan brick and the flame path brick, casing whirl device comprises a plurality of spinning disks, the flame path brick is equipped with tangential whirlwind hole. The utility model adopts a grading multi-gun form, and the flame path brick adopts a double-layer height structure, thereby shortening the flame height; the swirl device is designed at the throat, so that the mixing of air and fuel gas is enhanced; the tangential cyclone holes are formed in the flue bricks, so that more low-temperature flue gas is ensured to be introduced into a combustion area, and the generation of NOx is effectively reduced.

Description

Duplex ultra low NOx burner

Technical Field

The utility model relates to an industrial burner technical field, concretely relates to compound ultralow NOx combustor is applicable to industrial heating furnace such as oil refining, chemical industry and coal chemical industry stove.

Background

The performance of the burner in the industrial furnace directly influences factors such as the combustion efficiency, the combustion stability, the temperature distribution in the furnace, the emission of pollutants and the like of the heating furnace. The optimal structure of the burner plays a decisive role in ensuring that the combustion process in the heating furnace is smoothly carried out.

In order to adapt to the stricter emission indexes of the state on the pollutants of the enterprises, the GB31570-2015 regulates that: the limit of nitrogen oxides in the smoke executed by a special limit region does not exceed 100mg/m 3. After the new emission standard comes out, the country carries out low-nitrogen reconstruction on all oil refining chemical enterprises, a considerable effect is achieved, after a low-NOx burner is adopted, a large amount of NOx gas is discharged into the atmosphere, the living environment of people is well improved, but the low-nitrogen reconstruction is only limited to reconstruction of an old furnace and reconstruction of local equipment such as the burner, so that the old furnace and the low-NOx burner cannot be matched, and although NOx data is reduced, flame temperature rises along with the improvement, heat transfer moves upwards, and adverse effects such as local overtemperature of a radiation section of the furnace are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects and provide a compound ultra-low NOx burner, a fuel gas gun adopts a grading multi-gun form, and a flame path brick adopts a double-layer high-low structure, so that the flame height is shortened; the swirl device is designed at the throat, so that the mixing of air and fuel gas is enhanced; the tangential cyclone holes are formed in the flue bricks, so that more low-temperature flue gas is ensured to be introduced into a combustion area, and the generation of NOx is effectively reduced.

The purpose of the utility model is realized like this:

the utility model provides a compound ultralow NOx combustor, includes combustor casing, flame path brick, central fire pan brick, changming lamp and multistage fuel air gun, central fire pan brick, flame path brick are located the top of combustor casing, central fire pan brick is established and is put at combustor casing central point, the flame path brick is established in central fire pan brick periphery, and central fire pan brick exceeds the flame path brick, be equipped with casing whirl device between central fire pan brick and the flame path brick, casing whirl device comprises a plurality of spinning disks, the flame path brick is equipped with tangential whirlwind hole.

Preferably, the tangential cyclone holes are uniformly distributed in the circumferential direction of the flue brick.

Preferably, the multistage fuel air gun comprises a central fuel air gun and an edge fuel air gun, the collecting pipe is connected with the central fuel air gun and the edge fuel air gun, the central fuel air gun and the pilot burner are both arranged in the central fire basin brick, and the edge fuel air gun extends out of the spinning disk.

Preferably, the central nozzle is arranged at the top of the central fuel air gun, the spray holes of the central nozzle spray at the mouth of the central fire basin brick, and the load accounts for 9-10%.

Preferably, the side gun nozzle is arranged at the top of the side fuel gas gun, and the spray hole of the side gun nozzle is consistent with the direction of the swirl plate in the shell swirl device and the direction of the tangential cyclone hole of the flame path brick.

Preferably, a first-stage combustion channel is formed in the central fire basin brick, and a second-stage combustion channel is formed between the fire channel brick and the central fire basin brick.

The utility model has the advantages that:

1. strong injection: the effective method for reducing NOx is realized by using the flue gas with low-concentration oxygen and high-carbon dioxide, and the compound ultralow NOx burner is realized by firstly jetting the jet holes of the fuel gas spray gun at a high speed to form a first injection power, secondly jetting the jet power for a second channel by the rotary air opening of the flue brick, and superposing the first injection power and the second injection power to form a super-strong injection power, thereby introducing a large amount of flue gas into a combustion area.

2. Strong rotational flow: the compound ultra-low NOx burner has three rotational flows in the structure, and the combustion-supporting air is provided with the rotational flow sheets, so that the resistance drop is increased, and the mixing of air and fuel gas is enhanced; the multi-angle spray holes of the side fuel air gun nozzle form a second rotational flow, and the rotational flow is the key for reducing the height of flame; the tangential rotational flow of the opening on the flue brick is an important structure for ensuring that more low-temperature flue gas can be introduced into a combustion area.

3. Low flame: the middle fire pan is the foundation for stabilizing flame, and an outer rotational flow combustion channel formed by the middle fire pan and the fire channel bricks realizes ultralow NOx emission under the multiple actions of strong injection and strong rotational flow, and effectively reduces the height of the flame.

Drawings

Fig. 1 is a schematic structural diagram of a compound ultra-low NOx burner of the present invention.

Fig. 2 is a view taken along direction a of fig. 1.

FIG. 3 is a top view of the refractory bricks and the distribution B of the nozzles of the combustion gas gun.

Wherein: a housing 1; a double-handle adjusting mechanism 1.1; primary air is 1.2; secondary air is 1.3; 1.4 of a spinning disk; a faceplate 1.5; a flame path brick 2; tangential cyclone holes 2.1; a secondary combustion channel 2.2; a central brazier brick 3; a flame stabilizing auxiliary hole 3.1; a primary combustion channel 3.2; a pilot lamp 4; a flame stabilizing cover 4.1; a Venturi tube 4.2; a multi-stage fuel gas gun 5; a manifold 5.1; a metal hose 5.2; a central fuel gas gun 5.3; a central nozzle 5.4; a side fuel gas gun 5.5; 5.6 of a side gun nozzle; a fire observation hole 6; a furnace lining 7; and a hearth 8.

Detailed Description

Referring to fig. 1-3, the utility model relates to a compound ultralow NOx combustor, including combustor casing 1, flame path brick 2, central fire pan brick 3, pilot lamp 4, multistage fuel air gun 5 and seeing the fire hole 6, multistage fuel air gun 5 includes collecting tube 5.1, metal collapsible tube 5.2, central fuel air gun 5.3, central shower nozzle 5.4, limit fuel air gun 5.5 and limit rifle shower nozzle 5.6, central fire pan brick 3, flame path brick 2 are located the top of combustor casing 1, central fire pan brick 3 is established at combustor casing 1 central point and is put, flame path brick 2 is established in central fire pan brick 3 periphery, and central fire pan brick 3 exceeds flame path brick 2, ties the main flame between two bricks, plays the height that shortens flame. And a shell cyclone device is arranged between the central fire basin brick 3 and the flue brick 2 and consists of a plurality of cyclone sheets 1.4.

The below at combustor casing 1 is established to manifold 5.1, manifold 5.1 connects central fuel air gun 5.3 and limit fuel air gun 5.5, and central fuel air gun 5.3 and the 4 equipartitions of changming lamp are arranged in central fire basin brick 3, limit fuel air gun 5.5 stretches out spinning disk 1.4, and manifold 5.1 is connected through metal collapsible tube 5.2 with central fuel air gun 5.3, manifold 5.1 is ring shape, mainly gives central fuel air gun 5.3 and limit fuel air gun 5.4 distribution fuel.

The end part of the central fire basin brick 3 is provided with a plurality of flame stabilizing auxiliary holes 3.1.

The flue brick 2 is equipped with tangential cyclone hole 2.1, tangential cyclone hole 2.1 equipartition sets up in the circumference of flue brick 2, and tangential cyclone hole 2.1 has strengthened the effect of introducing the flue gas when limit fuel air gun 5.5's shower nozzle sprays, owing to introduced a large amount of low oxygen concentration's flue gas, can effectively reduce NOx and generate, is the key point that realizes ultralow NOx.

The pilot burner 4 is to form a stable flame, a flame stabilizing cover 4.1 at the top of the pilot burner 4 and a venturi tube 4.2 at the bottom of the pilot burner 4 are key parts of the pilot burner 4, and the burner housing 1 is a part for supporting all parts.

The double-handle adjusting mechanism 1.1 refines the air required by combustion and divides the air into primary air 1.2 and secondary air 1.3. The fire holes 6 are arranged in the front panel 1.5 of the housing 1 and the furnace lining 7 ensures that the high temperature of the furnace chamber 8 is not transmitted out in radiation.

The central nozzle 5.4 is arranged at the top of the central fuel air gun 5.3, the spray holes of the central nozzle 5.4 spray at the opening of the central fire basin brick 3, the load accounts for about 10%, and the central nozzle is mainly used for heating and burning the fire basin brick opening to stabilize peripheral main flame.

The limit rifle shower nozzle 5.6 sets up at the top of limit fuel air gun 5.5, the orifice of limit rifle shower nozzle 5.6 is unanimous with vortex sheet 1.4 orientation, flame path brick 2's tangential whirlwind hole 2.1 orientation in the casing whirl device, plays strong whirl effect.

A first-stage combustion channel 3.2 is formed in the central fire basin brick 3, and a second-stage combustion channel 2.2 is formed between the fire channel brick 2 and the central fire basin brick 3.

The working principle is as follows:

firstly, fuel gas enters the pilot burner and is ignited and combusted, main fuel gas is distributed to a central air gun and a side air gun through a collecting pipe and is ignited by flame of the pilot burner, reasonable air quantity is distributed through a double-handle air regulating mechanism, then two combustion flame areas are formed, namely central primary combustion flame and secondary swirl combustion flame, the central primary combustion flame is positioned in a primary combustion channel 3.2, and the secondary swirl combustion flame is positioned in a secondary combustion channel 2.2.

In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims (6)

1. A dual ultra-low NOx burner characterized by: including combustor casing (1), flame path brick (2), central flame pan brick (3), changming lamp (4) and multistage fuel air gun (5), central flame pan brick (3), flame path brick (2) are located the top of combustor casing (1), establish at combustor casing (1) central point in central flame pan brick (3) and put, flame path brick (2) are established in central flame pan brick (3) periphery, and central flame pan brick (3) are higher than flame path brick (2), be equipped with casing whirl device between central flame pan brick (3) and flame path brick (2), casing whirl device comprises a plurality of spinning disks (1.4), flame path brick (2) are equipped with tangential whirlwind hole (2.1).

2. The dual ultra low NOx burner of claim 1, wherein: the tangential cyclone holes (2.1) are uniformly distributed in the circumferential direction of the flue brick (2).

3. The dual ultra low NOx burner of claim 1, wherein: multistage fuel air gun (5) are including central fuel air gun (5.3) and limit fuel air gun (5.5), and central fuel air gun (5.3) and limit fuel air gun (5.5) are connected in manifold (5.1), and central fuel air gun (5.3) and changming lamp (4) equipartition are put in central fire basin brick (3), spinning disk (1.4) is stretched out in limit fuel air gun (5.5).

4. The dual ultra low NOx burner of claim 3, wherein: the central nozzle (5.4) is arranged at the top of the central fuel air gun (5.3), the spray holes of the central nozzle (5.4) spray at the mouth of the central fire basin brick (3), and the load accounts for 9-10%.

5. The dual ultra low NOx burner of claim 3 or 4, wherein: the side gun nozzle (5.6) is arranged at the top of the side fuel air gun (5.5), and the spray holes of the side gun nozzle (5.6) are consistent with the direction of the spinning disk (1.4) in the shell cyclone device and the direction of the tangential cyclone hole (2.1) of the flame path brick (2).

6. The dual ultra low NOx burner of claim 1, wherein: a first-stage combustion channel (3.2) is formed in the central fire basin brick (3), and a second-stage combustion channel (2.2) is formed between the fire channel brick (2) and the central fire basin brick (3).

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