CN217584442U

CN217584442U - Low-nitrogen heat accumulating type flat flame burner

Info

Publication number: CN217584442U
Application number: CN202220730023.8U
Authority: CN
Inventors: 焦伟红; 徐平; 杨阳; 何曼妮; 郭行; 潘涛
Original assignee: Beijing Longtao Environment Technology Co ltd
Current assignee: Beijing Longtao Environment Technology Co ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-10-14
Anticipated expiration: 2032-03-31

Abstract

The utility model provides a low nitrogen type heat accumulation formula flat flame burner, including regenerator and combustion chamber, regenerator bottom and combustion chamber intercommunication, the top then is provided with air intlet, in be provided with the burner block in the combustion chamber, the combustion chamber still is provided with the export, and in the gas spray gun stretched into the combustion chamber, the burning torch was close to in gas spray gun export setting, the gas spray gun includes one-level gas spray gun and second grade gas spray gun, one-level gas spray gun and second grade gas spray gun all stretched into the combustion chamber from the regenerator bottom, just second grade gas spray gun part was embedded into within the burner block. The utility model discloses a change the problem that NOx thing emission is high that conventional heat accumulation formula combustion method brought, combustion efficiency improves greatly, and NOx thing emission greatly reduced.

Description

Low-nitrogen heat accumulating type flat flame burner

Technical Field

The utility model relates to a combustor technical field especially relates to a low nitrogen type heat accumulation formula flat flame burner.

Background

At present, the known heating furnaces in domestic ferrous metallurgy and machinery industries mostly adopt a heat accumulating type burner and a matched combustion system to heat the furnaces, so that the fuel consumption can be greatly saved, and the heating furnaces are relatively mature and practical energy-saving products at home and abroad.

Aiming at small-sized furnaces, such as forging furnaces in the mechanical industry, the form of the small-sized furnaces is that a pair of heat accumulating type combustors are distributed at two combustion positions on the side of a heating furnace or the top of the furnace, one combustor is put into combustion work, the other combustor is closed and absorbs smoke in the furnace to enter a heat accumulator inside the combustor, the heat accumulator is heated, the heated smoke temperature is discharged after reaching below 200 ℃, reversing switching is carried out after the set time of a system is reached, the originally closed combustor starts to carry out combustion work, and the originally burning combustor is closed, and the process is repeated and circulated;

aiming at large-scale furnaces, such as trolley type heating furnaces in the mechanical industry and push steel type heating furnaces in the ferrous metallurgy industry, a plurality of groups of paired heat accumulating type burners and matched heat accumulating type combustion systems are adopted to complete the circulation.

The heat accumulating type burner and a related matched combustion system have the energy-saving effect of more than about 30 percent, are widely and mature applied to heating furnaces in the ferrous metallurgy and mechanical industries, the temperature of preheated air reaches more than 800 ℃, violent combustion reaction is generated when the preheated air is sprayed and mixed with fuel, the temperature of flame is high and concentrated, the temperature gradient distribution of the flame is very obvious, and therefore, nitrogen oxides generated by combustion are very high.

Along with the national and local attention on the NOx emission of the industrial furnace, more and more severe emission indexes are established, and the low-nitrogen heat accumulating type heating furnace burner can replace the conventional heat accumulating type heating furnace burner, so that the low-nitrogen heat accumulating type heating furnace burner has wide application prospect.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the defect that prior art exists, the utility model provides a low nitrogen type heat accumulation formula flat flame burner realizes the ultralow nitrogen emission of energy-efficient environmental protection.

In order to solve the technical problem, the utility model discloses a technical scheme is: a low-nitrogen heat accumulating type flat flame burner comprises a heat accumulating chamber and a combustion chamber, wherein the bottom end of the heat accumulating chamber is communicated with the combustion chamber, the top end of the heat accumulating chamber is provided with an air inlet, a burner block is arranged in the combustion chamber, the combustion chamber is also provided with an outlet, a gas spray gun extends into the combustion chamber, an ignition gun is arranged close to the outlet of the gas spray gun,

the gas spray gun comprises a first-stage gas spray gun and a second-stage gas spray gun, the first-stage gas spray gun and the second-stage gas spray gun both extend into the combustion chamber from the bottom of the regenerator, and the second-stage gas spray gun is partially embedded into the burner block.

Furthermore, the burner block is close to the outlet of the combustion chamber and is in an arc-shaped bell mouth shape.

Furthermore, a tangential opening is arranged at the lower part of the regenerative chamber, and the tangential opening and the inner wall of the combustion chamber form a flow guide tangential groove.

Furthermore, a plurality of ceramic honeycomb bodies and baffle bricks are arranged in the regenerator, and the plurality of ceramic honeycomb bodies are stacked on the baffle bricks.

And furthermore, a secondary gas nozzle is arranged at the tail end of the secondary gas spray gun and is buried in the burner block.

Furthermore, the tail end of the secondary gas nozzle is arranged tangentially to the outlet of the burner block.

Furthermore, a sealing device is arranged between the nozzle of the first-stage gas spray gun and the combustion chamber and used for avoiding gas leakage.

Compared with the prior art, the beneficial effects of the utility model include: the problem of high NOx emission caused by a conventional heat accumulating type combustion mode is solved, the combustion efficiency is greatly improved, and the NOx emission is greatly reduced.

Drawings

The disclosure of the present invention is explained with reference to the drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:

fig. 1 schematically shows a structure of a regenerative flat flame burner of a low nitrogen type.

Fig. 2 schematically shows a cross-sectional view of a regenerative flat flame burner of low nitrogen type.

Fig. 3 schematically shows a cross-sectional view of the combustion chamber.

Reference numbers in the figures: 1-an air inlet, 2-a regenerator, 3-a ceramic honeycomb body, 4-a baffle brick, 5-an ignition gun, 6-a gas spray gun, 7-a secondary gas spray gun, 8-a primary gas spray gun, 9-a secondary gas spray nozzle, 10-a burner brick and 11-a diversion tangential groove.

Detailed Description

It is easily understood that, according to the technical solution of the present invention, a plurality of alternative structural modes and implementation modes can be proposed by those skilled in the art without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

An embodiment according to the present invention is shown in conjunction with fig. 1. A low-nitrogen heat accumulating type flat flame burner comprises a heat accumulating chamber 2 and a combustion chamber, wherein the upper end part is of a cone structure, the middle end part is of a cylinder structure, the cone structure is an air inlet 1, a ceramic honeycomb body 3 and a baffle plate brick 4 are arranged in the middle end part, the number of the ceramic honeycomb bodies 3 is at least 2, and the ceramic honeycomb bodies 3 are arranged on the baffle plate brick 4 in a stacking mode.

The whole regenerator 2 is of a hollow structure, the bottom of the regenerator 2 is communicated with the combustion chamber, the combustion chamber is also provided with an outlet, a burner block 10 is arranged in the combustion chamber, and the burner block 10 is arranged at the outlet of the combustion chamber; the gas spray gun 6 extends into the combustion chamber from the closed end of the combustion chamber, and a ceramic fiber felt with the thickness of 20mm is arranged around the gas spray gun 6 to assist in completing the sealing work.

The gas spray gun 6 comprises a first-stage gas spray gun 8 and a second-stage gas spray gun 7, the first-stage gas spray gun 8 directly enters the combustion chamber from the inner wall of the combustion chamber, the second-stage gas spray gun 7 enters the combustion chamber from the gas conveying pipeline in a shunting manner, and the second-stage gas spray gun 7 is embedded in the burner block 10, so that the output end of the second-stage gas spray gun 7 is positioned at the tail end of the burner block 10.

Combustion-supporting air at an outlet enters a regenerator 2 from an air inlet 1, enters a combustion chamber through a ceramic honeycomb body 3 and a baffle brick 4, is mixed with a small amount of gas sprayed by a primary gas spray gun 8 in a gas spray gun 6, and is low in combustion temperature, NOx is inhibited and the generated amount is extremely small due to the small amount of gas and the excessive amount of air; after the flue gas generated by the combustion of the primary fuel gas is mixed with air, the oxygen content is reduced to be less than 19 percent, and the flue gas is sprayed out from the outlet of the burner block 10.

At this time, the secondary gas spray gun 7 leads the secondary gas to the final outlet of the burner block 10 to be secondarily mixed with the mixed flue gas mixed with air along the primary gas combustion, and because the concentration of the mixed flue gas is less than 19%, the gas concentration is in an excessive fuel state, the secondary gas combustion is inhibited again, and the generation of NOx is greatly reduced.

The structure makes full use of the gas classification and gas recirculation principle, and the gas generated by combustion is respectively mixed with air and fuel, so that the oxygen concentration in the air is reduced to 19% before the gas is mixed in the burner block 10, the fuel injection concentration is further reduced, the combustion flow field distribution is more dispersed, the combustion temperature is more uniform, the temperature gradient is more gentle, no obvious peak-valley effect exists, the thermal NOx is greatly inhibited, and the NOx emission after combustion is greatly reduced.

Above-mentioned burner block 10 is pressed close to the combustion chamber exit, and in pressing close to the combustion chamber exit, burner block 10 is arc horn mouth shape, and above-mentioned structure can produce the effect of attaching to the wall when making air and flue gas air current flow through this structure, is the structure basis that forms flat flame.

As shown in fig. 2, a tangential opening is formed at the lower part of the regenerator 2, a cylindrical cavity is formed in the combustion chamber, and the tangential opening is communicated with the edge of the cylindrical cavity positioned in the combustion chamber to form a flow guide tangential groove 11, so that an air word tangential opening flowing from an air inlet 1 at the top of the regenerator 2 enters the combustion chamber, and due to the existence of the flow guide tangential groove 11, air can make tangential rotation motion along the inner hole wall of the burner block 10, and the air is generated during the motion and rotates to form a power source of flat flame.

As shown in fig. 3, a secondary gas nozzle 9 is disposed at the end of the secondary gas lance 7, the secondary gas nozzle 9 is also embedded in the burner block 10, and the secondary gas nozzle 9 is directed or perpendicular to the outlet of the burner block 10. For the above-mentioned second grade gas nozzle 9, it also need be tangential to the setting of burner block 10 export, and its setting angle uses the tangential angle who just is the cross-section circle that burner block 10 constitutes, can form rotary motion here after the secondary gas blowout like this, and along with the rotation that air and flue gas formed here, the air need be unanimous in the gas direction of rotation, can carry out better mixture, forms the effect of flat flame burning.

The heating furnace heat storage system is constructed by the low-nitrogen heat storage type flat flame burner, and comprises at least one pair of low-nitrogen heat storage type flat flame burners, wherein the pair of low-nitrogen heat storage type flat flame burners are oppositely arranged, and a gas spray gun of the low-nitrogen heat storage type flat flame burner is supplied with gas by a gas pipeline. The fuel quick-switching valve comprises a left side fuel quick-switching valve and a right side fuel quick-switching valve and is used for independently controlling whether the fuel enters a left side or right side low-nitrogen type regenerative flat flame burner or not, and the fuel regulating valve is arranged on a fuel conveying main pipeline.

The low-nitrogen heat accumulating type flat flame burner is characterized by further comprising a chimney, a fan and an air regulating valve, wherein the air regulating valve is arranged at the output end of the fan and used for regulating the amount of air conveyed to the low-nitrogen heat accumulating chamber 2 flat flame burner, and an air reversing valve is further arranged between the air regulating valve and the chimney, so that the low-nitrogen heat accumulating type flat flame burner is convenient to switch.

Air generated by the fan enters the left combustor regenerator 2 through the air regulating valve and the air reversing valve, then enters the burner block 10 from honeycomb holes in the ceramic honeycomb body 3 through the baffle block 4, is mixed with fuel sprayed by a fuel spray gun, and enters a hearth to burn after encountering continuous flame generated by the ever-burning torch 5.

The flue gas generated by combustion enters a burner block 10 of a right burner, flows through the burner block 10 of the right burner, enters a regenerator 2 of the right burner to heat the ceramic honeycomb body 3 to be about 100 ℃ lower than the furnace temperature, passes through the last layer of ceramic honeycomb body 3, is cooled to be below 200 ℃, and is discharged into the atmosphere from an air inlet 1 of the right burner through an air reversing valve to a chimney.

In the above process, the left fuel cutoff valve is in an open state, and the right fuel cutoff valve is in a closed state.

Above-mentioned air reversing valve is the quadbit two-way form, and it does not limit for it here, can be according to the good reciprocal transform direction of switching-over cycle circulation of combustion control programming.

The combustion load is adjusted by the air adjusting valve and the fuel adjusting valve.

Air generated by the fan passes through the air regulating valve, a pipeline in the right burner direction is selected after the air reversing valve enters the heat storage chamber 2 of the right burner, and flows out of a hole system in the ceramic honeycomb body 3 through the baffle brick 4, at the moment, the ceramic honeycomb body 3 in the heat storage chamber 2 of the right burner is heated by the last reversing period, the air enters the area of the ceramic honeycomb body 3 and is rapidly heated to be about 100 ℃ lower than the furnace temperature, the heated high-temperature air enters the burner brick 10 and is mixed with fuel sprayed by a fuel spray gun, and the air enters the inner combustion chamber of the furnace to be combusted after encountering continuous flame generated by the ignition gun 5.

The flue gas generated by combustion enters the burner block 10 of the left burner, flows through the burner block 10 of the right burner, enters the regenerator 2 of the left burner to heat the ceramic honeycomb body 3 to a temperature about 100 ℃ lower than the furnace temperature, passes through the last layer of ceramic honeycomb body 3, is reduced to a temperature below 200 ℃, and then flows out of the air inlet 1 of the left burner to be discharged into the atmosphere through an air reversing valve and a chimney.

The technical scope of the present invention is not limited to the content in the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical spirit of the present invention, and these modifications and changes should fall within the protection scope of the present invention.

Claims

1. A low-nitrogen heat accumulating type flat flame burner comprises a heat accumulating chamber (2) and a combustion chamber, wherein the bottom end of the heat accumulating chamber (2) is communicated with the combustion chamber, the top end of the heat accumulating chamber is provided with an air inlet (1), a burner block (10) is arranged in the combustion chamber, the combustion chamber is also provided with an outlet, the low-nitrogen heat accumulating type flat flame burner is characterized in that a gas spray gun (6) extends into the combustion chamber, an ignition gun (5) is arranged close to the output end of the gas spray gun (6),

the gas spray gun (6) comprises a first-stage gas spray gun (8) and a second-stage gas spray gun (7), the first-stage gas spray gun (8) and the second-stage gas spray gun (7) extend into the combustion chamber from the bottom of the regenerator (2), and the second-stage gas spray gun (7) is partially embedded in the burner block (10).

2. A low-nitrogen regenerative flat flame burner according to claim 1, wherein the burner block (10) is formed in an arc bell shape near the outlet of the combustion chamber.

3. A regenerative flat flame burner of the low nitrogen type according to claim 1, characterized in that the lower part of the regenerator (2) is provided with tangential openings which form with the inner wall of the combustion chamber a flow guiding tangential slot (11).

4. A regenerative flat flame burner of low nitrogen type according to claim 1, wherein a plurality of ceramic honeycomb bodies (3) and baffle bricks (4) are disposed in the regenerative chamber (2), the plurality of ceramic honeycomb bodies (3) being stacked on the baffle bricks (4).

5. The low-nitrogen regenerative flat flame burner according to claim 1, wherein a secondary gas nozzle (9) is provided at the end of the secondary gas injection lance (7), and the secondary gas nozzle (9) is embedded in the burner block (10).

6. The low-nitrogen regenerative flat flame burner of claim 5, wherein the secondary gas nozzle (9) is disposed with its tip end tangential to the burner block (10) outlet.

7. The low-nitrogen regenerative flat flame burner according to claim 1, wherein a sealing means is provided between the nozzle of the primary gas injection lance (8) and the combustion chamber to prevent the gas from leaking.