CN114001351A

CN114001351A - Novel heat accumulating type low-nitrogen burner

Info

Publication number: CN114001351A
Application number: CN202111496818.3A
Authority: CN
Inventors: 王爱中; 任琮炜; 顾鹂鋆
Original assignee: Wuxi Biendel Technology Co ltd
Current assignee: Wuxi Biendel Technology Co ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-02-01

Abstract

The invention is suitable for the fields of energy saving technology and environmental protection technology of heating furnaces, and provides a brand-new regenerative low-nitrogen burner, comprising: a heating furnace, in which steel billets are arranged, wherein two opposite sides of the heating furnace are arranged oppositely. A plurality of upper burners and lower burners are symmetrically distributed on the outer wall along its extending direction, the upper burners are located above the lower burners, and each of the upper burners and the lower burners are connected The heating furnace is used to transport air and/or coal gas into the heating furnace respectively to realize the forging of the steel billet. The multi-jet multi-stage combustion control technology is adopted, and the air and the gas are respectively used with multiple jets. The regenerator inside the burner is preheated and sprayed out to form a multi-stage mixed air flow. Outside the burner, high-efficiency concentration separation technology, space combustion classification technology and other means are used to not only ensure stable flame combustion, but also to use up and down, Left and right adjustable gas or combustion air nozzle angle adjustment.

Description

Novel heat accumulating type low-nitrogen burner

Technical Field

The invention belongs to the technical fields of heating furnace energy conservation and environmental protection, and particularly relates to a brand new heat accumulating type low-nitrogen burner.

Background

The regenerative combustion technology is to preheat air (or coal gas) to a temperature close to the temperature of flue gas by limit recovery of the enthalpy of the flue gas. At this time, if combustion is not controlled, the flame temperature will rise to 2000 ℃ or higher, and NOx with a high concentration will be generated. In order to meet the emission standard, oxygen enrichment or pure oxygen treatment before combustion or flue gas denitrification treatment after combustion is usually adopted to reduce or adsorb nitrogen oxides generated in the flue gas, so that the emission of NOx is reduced. However, the above method needs to increase the investment cost of process equipment and the cost of operation materials and labor, and has the disadvantages of low absorption efficiency.

On the premise of not reducing the preheating temperature of air (or coal gas) and increasing the investment cost of process equipment and the operating material and labor cost, the NOx content in the flue gas of the heat accumulating type burner is greatly reduced by adopting various combustion control schemes, the emission requirement reaching the standard is met, and the technical difficulty of overcoming the requirement of the product is achieved.

Disclosure of Invention

The invention provides a brand-new heat accumulating type low-nitrogen burner, and aims to solve the problems in the background technology.

The invention is realized in this way, a brand new heat accumulating type low-nitrogen burner, comprising: the heating furnace is internally provided with a steel billet, wherein a plurality of upper burners and lower burners are symmetrically distributed on the outer walls of two opposite sides of the heating furnace along the extension direction of the heating furnace, the upper burners are positioned above the lower burners, and each of the upper burners and the lower burners are communicated with the heating furnace and are respectively used for conveying air and/or coal gas into the heating furnace to forge the steel billet.

Preferably, each of the upper burner and the lower burner has: the burner comprises an air box body and a gas box body, wherein the air box body in the upper burner is positioned above the gas box body, and the gas box body in the lower burner is positioned above the air box body.

Preferably, 2-3mm of refractory mortar is coated between each air box body and the corresponding gas box body.

Preferably, the upper burners located on the same side wall of the heating furnace are all located on the same horizontal line, and the lower burners located on the same side wall of the heating furnace are all located on the same horizontal line.

Preferably, the air box or the gas box comprises: the connecting cover, what its top was linked together is provided with the air inlet, is located the rigid coupling has the casing on the lateral wall of connecting cover, just the inside of casing be provided with the heat accumulator that the connecting cover is linked together, the heat accumulator is kept away from one side of connecting cover is provided with the baffle brick, just the gas outlet has been seted up on one side outer wall of casing, is provided with the spout brick of a plurality of slopes in it, through a plurality of the angle when spout brick realizes air/coal gas blowout is adjusted, the heat accumulator with the pouring material has been filled between the casing.

Preferably, an access door is movably connected to the outer wall of one side of the connecting cover.

Preferably, a flow guide plate is further disposed between the air inlet and the heat storage body, and the flow guide plate is used for reducing bias flow of air/gas discharged through the air inlet.

Compared with the prior art, the invention has the beneficial effects that: the invention relates to a brand new heat accumulating type low-nitrogen burner which comprises the following components in parts by weight:

the multi-jet multistage combustion control technology is adopted, air and gas are respectively preheated by the multi-jet from a heat accumulator in the burner and then sprayed out to form multi-stage mixed gas flow, the flame combustion stability is ensured by adopting means such as a high-efficiency shade separation technology and a space combustion classification technology outside the burner, the highest temperature of air supply and flame reduction in the furnace as required can be realized by adopting up-down and left-right adjustable gas or combustion-supporting air nozzle angle adjustment, and more importantly, the ultralow NOx combustion emission is realized.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of an upper burner of the present invention;

FIG. 3 is a schematic structural view of a lower burner of the present invention;

FIG. 4 is an internal cross-sectional view of an air or gas cabinet of the present invention;

FIG. 5 is a schematic diagram of the multistage mixing of the present invention;

in the figure: 1. heating furnace; 2. an upper burner; 3. a lower burner; 4. an air box body; 5. a gas box body; 6. a connecting cover; 7. an air inlet; 8. a housing; 9. a heat accumulator; 10. a baffle brick; 11. a billet; 12. a spout brick; 13. pouring a material; 14. an access door; 15. a baffle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

Referring to fig. 1-5, the present invention provides a technical solution,

a brand-new heat accumulating type low-nitrogen burner comprises:

the device comprises a heating furnace 1, wherein a steel billet 11 is arranged in the heating furnace 1, wherein a plurality of upper burners 2 and lower burners 3 are symmetrically distributed on the outer walls of two opposite sides of the heating furnace 1 along the extension direction of the heating furnace, the upper burners 2 are positioned above the lower burners 3, and each of the upper burners 2 and the lower burners 3 is communicated with the heating furnace 1 and is respectively used for conveying air and/or coal gas into the heating furnace 1 to forge the steel billet 11;

each of the upper burner 2 and the lower burner 3 has: the burner comprises an air box body 4 and a gas box body 5, wherein the air box body 4 in the upper burner 2 is positioned above the gas box body 5, and the gas box body 5 in the lower burner 3 is positioned above the air box body 4;

and 2-3mm of refractory mortar is coated between each air box body 4 and the corresponding gas box body 5.

Specifically, the heat accumulating type low-nitrogen burner consists of a gas heat accumulating box body (a gas box body 5) and an air heat accumulating box body (an air box body 4), the upper structure and the lower structure are arranged, before the heat accumulating type low-nitrogen burner is installed on a furnace wall of a heating furnace 1, an upper burner 2 and a lower burner 3 are combined according to a furnace body diagram, the upper burner 2 is the air box body 4 at the upper end, and the gas box body 5 is at the lower end; the lower burner 3 is a gas box 5 at the upper end, the air box 4 is at the lower end, wherein, the air box 4 and the gas box 5 need to be installed according to the direction of the interface on the sub-pipeline diagram of the heating furnace 1 when being assembled, and the burner interfaces of the same category on the furnace walls of the heating furnaces 1 at two sides need to be symmetrically arranged, a layer of 2-3mm refractory mortar is smeared between the upper and lower boxes (namely, the gap between the air box 4 and the gas box 5 arranged in the upper burner 2 or the lower burner 3) to ensure no gap, and then the box steel structures are stably connected in a continuous welding mode.

In addition, by adopting the above-mentioned mode, the present invention has several advantages as follows:

1) the heat recovery rate is more than 80 percent;

2) under the precondition of the furnace temperature of 1150 ℃, the emission of NOx is not more than 100mg/m3, and the investment cost of process equipment and the operating material and labor cost are not increased;

3) the mixing jet plate can be replaced to adjust the flame length. (the temperature uniformity in the length direction of the blank with the shortest length of 1m and the longest length of 16m is not more than 30 ℃).

As a preferable scheme of the above embodiment, a plurality of upper burners 2 located on the same side wall of the heating furnace 1 are all located on the same horizontal line, and a plurality of lower burners 3 located on the same side wall of the heating furnace 1 are all located on the same horizontal line.

Specifically, the aim is to effectively ensure that the burners on the same horizontal line can stably spray flue gas into the heating furnace 1, so that the normal processing of the billet 11 is ensured.

Referring to fig. 1-5, each of the air box 4 and the gas box 5 includes: the top of the connecting cover 6 is communicated with an air inlet 7, a shell 8 is fixedly connected to one side wall of the connecting cover 6, a heat accumulator 9 communicated with the connecting cover 6 is arranged inside the shell 8, a baffle brick 10 is arranged on one side, away from the connecting cover 6, of the heat accumulator 9, an air outlet is formed in the outer wall of one side of the shell 8, a plurality of inclined nozzle bricks 12 are arranged in the shell, the angle of air/coal gas during spraying is adjusted through the nozzle bricks 12, and a pouring material 13 is filled between the heat accumulator 9 and the shell 8;

an access door 14 is movably connected to the outer wall of one side of the connecting cover 6;

a guide plate 15 is arranged between the air inlet 7 and the heat accumulator 9, and the guide plate 15 is used for reducing the bias flow of the air/coal gas exhausted from the air inlet 7.

Specifically, in this embodiment, a multi-jet multistage combustion control technology is adopted, air and gas are preheated and then sprayed out from a heat accumulator 9 inside the burner respectively through multi-jet to form multi-stage mixed gas flow, and the stable combustion of flame is ensured by adopting means such as a high-efficiency shade separation technology and a space combustion classification technology outside the burner, and the air supply and the maximum temperature of flame reduction in the furnace as required can be realized by adopting up-down and left-right adjustable gas or combustion-supporting air nozzle angle adjustment, and more importantly, the combustion emission of ultra-low NOx is realized.

The heat accumulating type full-digital combustion control technology is an intelligent full-automatic control mode. All the heat accumulating type burners are in the designed optimal combustion state once being combusted, and the gas outlet speed of the burners is guaranteed to be unchanged during combustion. Introduce heat accumulation formula combustion control system with full digital combustion control thinking and not change its "expert" and "disconnected" proportion, because this can cause "water equivalent" inequality, or make system control more complicated, the way of this scheme is to adopt a double-deck quick switching-over valve and trip valve that can totally end, the work that makes heat accumulation formula nozzle is "work" or "shock" state in pairs according to the requirement of temperature control precision, and make the "shock" time of certain section or even whole heat accumulation formula nozzle of stove stagger each other through computer control, in order to avoid causing the interference to the pressure control in coal gas main pipe, air main pipe, smoke extraction main pipe and the stove. In practice, the piping arrangement is not a traditional segmental method, but all burners are "hung" in parallel on a header, and even each pair of burners can be individually made into "segments" if the process requires. The characteristic of the regenerative full-digital combustion system ensures the necessary conditions and all the advantages of regenerative combustion while the heat load supply curve of the whole furnace becomes very flexible.

The multi-strand high-speed airflow entrainment smoke controls combustion atmosphere, and the smoke in the furnace is entrained and sucked through negative pressure generated on the surface of the multi-strand high-speed ejected air (or coal gas) airflow and circularly flows back to the high-speed airflow, so that the emission of NOx is further reduced, and the main reasons are as follows:

after the flue gas is involved, the oxygen concentration of combustion-supporting air in a combustion area can be reduced (thin oxygen-poor high-temperature airflow with the oxygen content greatly lower than 21 percent is formed);

after the flue gas is involved, the concentration of the coal gas (the heat value of the fuel is reduced) can be reduced, and the theoretical combustion temperature of the combustion of the burner can be reduced;

the flue gas is combusted again, so that the generated NOX is subjected to reduction reaction, and the reaction formula is as follows:

4NO+CH4＝2N2+CO2+2H2O

2NO+2CnHm+(2n+m/2-1)O2＝N2+2nCO2+mH2O

2NO+2H2＝N2+2H2O

the method aims to: by adopting the combustion control method, the NOx content in the heat accumulating type combustion flue gas is greatly reduced, and the emission requirement reaching the standard is met.

It should be noted that the guide plate 15 is arranged to function in that the guide plate 15 functions to cause a bias flow when air (or coal gas) directly enters the connecting cover 6 through the pipeline, and the guide plate 15 divides the air flow into a plurality of strands, so as to reduce the bias flow phenomenon, and make the air flow uniformly pass through the heat accumulator 9.

In addition, in fig. 5, a group of heat accumulating type burners arranged up and down is shown, and because the nozzles are multi-layer hole flow streams, the combustion can be carried out in a grading way through a plurality of mixing angles, and the combustion is more sufficient and is not concentrated. Can effectively avoid the concentration of high temperature points and reduce the highest temperature of flame. The NOx content in the smoke is reduced. So the low-nitrogen burner is called.

The working principle and the using process of the invention are as follows: after the invention is installed:

the multi-jet multistage combustion control technology is adopted, air and gas are respectively preheated by the multi-jet from the heat accumulator 9 in the burner and then sprayed out to form multi-stage mixed gas flow, the flame combustion stability is ensured by adopting means such as a high-efficiency shade separation technology and a space combustion classification technology outside the burner, the gas or combustion-supporting air nozzle angle adjustment can be adjusted up and down and left and right, the air supply in the furnace as required and the highest temperature of flame reduction are realized, and more importantly, the combustion emission of ultralow NOx is realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A brand-new heat accumulating type low-nitrogen burner is characterized by comprising:

a heating furnace (1) in which a billet (11) is arranged;

wherein, a plurality of upper burners (2) and lower burners (3) are symmetrically distributed on the outer walls of two opposite sides of the heating furnace (1) along the extension direction of the heating furnace;

the upper burner (2) is positioned above the lower burner (3);

and each of the upper burner (2) and the lower burner (3) is communicated with the heating furnace (1) and is respectively used for conveying air and/or coal gas into the heating furnace (1) to forge the steel billet (11).

2. A new regenerative low nitrogen burner as defined in claim 1, wherein each of said upper burner (2) and said lower burner (3) has:

an air box body (4) and a gas box body (5);

the air box body (4) in the upper burner (2) is positioned above the gas box body (5);

and the gas box body (5) in the lower burner (3) is positioned above the air box body (4).

3. A new regenerative low nitrogen burner as defined in claim 2, wherein each of said air boxes (4) and the corresponding gas box (5) is coated with 2-3mm refractory mortar.

4. A new regenerative low nitrogen burner as defined in claim 1, wherein said upper burners (2) located on the same side wall of said furnace (1) are all located on the same horizontal line;

and the lower burners (3) positioned on the same side wall of the heating furnace (1) are all positioned on the same horizontal line.

5. A new regenerative low nitrogen burner as defined in claim 3, wherein said air box (4) or said gas box (5) comprises:

the top of the connecting cover (6) is communicated with an air inlet (7);

a shell (8) is fixedly connected to one side wall of the connecting cover (6), and a heat accumulator (9) communicated with the connecting cover (6) is arranged in the shell (8);

a baffle brick (10) is arranged on one side of the heat accumulator (9) far away from the connecting cover (6), an air outlet is formed in the outer wall of one side of the shell (8), and a plurality of inclined nozzle bricks (12) are arranged in the air outlet;

the angle of air/coal gas spraying is adjusted through the plurality of nozzle bricks (12);

and a pouring material (13) is filled between the heat accumulator (9) and the shell (8).

6. A new heat accumulating type low-nitrogen burner as claimed in claim 5, wherein an access door (14) is also movably connected to the outer wall of one side of the connecting cover (6).

7. A new regenerative low nitrogen burner as claimed in claim 6, characterized in that a baffle (15) is provided between said inlet (7) and said heat accumulator (9);

the deflector (15) is used for reducing the bias flow of the air/coal gas discharged through the air inlet (7).