CN211290049U - Self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner - Google Patents
Self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner Download PDFInfo
- Publication number
- CN211290049U CN211290049U CN201921511544.9U CN201921511544U CN211290049U CN 211290049 U CN211290049 U CN 211290049U CN 201921511544 U CN201921511544 U CN 201921511544U CN 211290049 U CN211290049 U CN 211290049U
- Authority
- CN
- China
- Prior art keywords
- burner
- combustion
- spray pipe
- gas
- supporting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 129
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 127
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 35
- 230000003647 oxidation Effects 0.000 title claims abstract description 34
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 155
- 239000007921 spray Substances 0.000 claims abstract description 112
- 238000002485 combustion reaction Methods 0.000 claims abstract description 78
- 238000012806 monitoring device Methods 0.000 claims abstract description 5
- 239000011819 refractory material Substances 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 36
- 239000002184 metal Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- 230000002829 reductive effect Effects 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000000446 fuel Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
A self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner comprises a burner shell, a gas inlet, a peephole, a burner connecting flange, a flue gas discharge pipeline, a combustion-supporting air inlet, a burner gas spray pipe, an ignition electrode, a flame monitoring device, an ignition electrode interface and a swirler; the burner gas spray pipe is composed of a main burner gas spray pipe and an auxiliary burner gas spray pipe, the main burner gas spray pipe communicated with a gas inlet is arranged on the outer side of the burner gas spray pipe which is centered on a Laval combustion-supporting gas spray pipe in a burner shell, a flue gas backflow channel is arranged on the inner wall of the burner shell, and a dividing wall type air preheater is arranged between the channel and the main burner gas spray pipe; the auxiliary burner gas spray pipe is arranged in the built-in auxiliary burner at the rear part of the center of the Laval combustion-supporting gas spray pipe; and part of flue gas discharged by the burner is sucked into the Laval combustion-supporting gas spray pipe and is mixed with combustion-supporting air sprayed by the combustion-supporting air spray pipe to be sprayed out, so that low-nitrogen non-oxidation combustion is realized.
Description
Technical Field
The utility model relates to a nozzle that metal thermal treatment used, especially a from low nitrogen non-oxidation nozzle of preheating-type flue gas self-loopa type belongs to metal thermal treatment technique and environmental protection technical field.
Background
The self-preheating burner integrates the burner and a combustion air preheater, the burner is a burner and a smoke exhaust channel, the combustion air performs countercurrent heat exchange with high-temperature smoke in the preheater, the combustion air is preheated to a high temperature by using waste heat in the smoke, the effect of recycling the waste heat of the smoke is realized, and the burner has the advantages of compact structure, small overall size and the like, and is applied more in the aspect of industrial furnace combustion equipment. However, the burner of this structure does not contribute much to the reduction of the amount of NOx produced. The flue gas is returned and recycled in the combustion process, so that the generation amount of NOx can be reduced, and the method is an environment-friendly combustion mode. The existing flue gas recirculation modes all need additional pipelines and fans, and the field use is very inconvenient. In addition, because the temperature of the discharged flue gas is higher, the flue gas needs to be cooled in order to ensure the operation safety of the fan, and the energy conservation is not facilitated.
Chinese patent document CN 108884992a discloses a "low nitrogen oxide burner" which relates to a heating medium boiler comprising a burner having a fuel nozzle formed at the center thereof, a plurality of small lean/rich flames formed at the end face of the burner through a plurality of fuel nozzles which are completely separated, thereby realizing re-combustion and recycling exhaust gas generated from the flames to minimize nitrogen oxides (NOx). The basic combustion system can be realized by a simple structure without peripheral devices, and nitrogen oxides (NOx) can be remarkably reduced by dividing flames into small-sized ones, dispersing heat, lowering flame temperature, forming each small-sized flame into flames with an optimized air-fuel ratio, and guiding a rapid combustion reaction. This patent still discloses utility model's "low nitrogen oxide combustor" is used for the embodiment of heat medium stove, improves pipeline and fan and draws the part flue gas in the heat medium stove in utility model's the combustor, realizes the flue gas circulation. Although the patent can reduce the amount of (NOx) produced, the divided small burners are independently arranged by their own mechanical structures and are independently combusted, and it is difficult to meet the long flame requirement of the heating furnace in the steel industry. In addition, when the thermal load of the burner is changed, the air-fuel ratio change of each small burner is difficult to effectively control. The flue gas circulation of the burner needs to be additionally provided with a pipeline and a fan, the system is complex, and the flue gas circulation is difficult to effectively implement on site.
Chinese patent document CN 109307270 a discloses a "low NOx self-preheating burner with internal flue gas backflow", which relates to a hierarchical gas supply structure by setting, different combustion modes are set as required, and simultaneously by setting an ejector and correspondingly setting a flue gas backflow hole, the combustion air introduces the backflow flue gas after passing through the ejector, and burns again after mixing with combustion air and gas, after mixing flue gas and combustion air, the local oxygen concentration of the mixture in the combustion chamber and the heating space is reduced, so that the reaction time and space of the fuel are elongated, a high-temperature area with local violent combustion is not easily formed, the energy of the high-temperature area is reduced, the generation amount of NOx is effectively reduced, and the combustion efficiency is improved. The difference between this patent and conventional self-preheating burners is that: a small nozzle (ejector) is arranged on the combustion air channel, a small hole is formed in the wall of the smoke exhaust pipeline near the ejector, a small part of smoke is ejected to flow back through the combustion air and is mixed with the combustion air to enter the combustion chamber. This patent only draws and penetrates the flue gas backward flow by combustion air's kinetic energy, and its volume of drawing and penetrating the flue gas is difficult to control, and when combustion air's pressure and the suction of discharging fume did not match, the flue gas was difficult to be drawn and penetrated the backward flow and come in combustion air.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the aim is to develop a controllable self-preheating burner nozzle for realizing flue gas backflow, which can greatly reduce the generation amount of NOx, prevent the oxidation burning loss of metal materials, improve the metal yield and reduce the production cost.
The above technical scheme of the utility model realize that the purpose is through following technical scheme:
a self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner comprises a burner shell 5, a gas inlet 10, a peephole 11, a burner connecting flange 7, a flue gas discharge pipeline 8, a combustion-supporting air inlet 15, a burner gas spray pipe, an ignition electrode 1, a flame monitoring device 13, an ignition electrode interface 12 and a swirler 22, wherein the gas inlet 10, the peephole 11, the burner connecting flange 7, the flue gas discharge pipeline 8, the combustion-supporting air inlet and the swirler 22 are arranged on the position of the burner shell filled with refractory materials 6; the method is characterized in that: the burner gas spray pipe is composed of a main burner gas spray pipe 2 and an auxiliary burner gas spray pipe 14 which are arranged separately, a Laval combustion-supporting gas spray pipe 20 arranged at the center of a refractory material 6 of a burner shell 5 is taken as the center, the outer side of the main burner gas spray pipe is provided with the main burner gas spray pipe 2 communicated with a gas inlet 10, a flue gas backflow channel 21 is arranged close to the inner wall of the burner shell 5, and a dividing wall type air preheater 4 is arranged between the flue gas backflow channel 21 and the main burner gas spray pipe 2; the auxiliary burner gas spray pipe 14 is arranged in the built-in auxiliary burner 17 at the rear part of the central inner cavity of the Laval combustion-supporting gas spray pipe 20; the raw air entering from the combustion-supporting air inlet 15 exchanges heat with the flue gas discharged from the outer side of the burner body through the dividing wall type air preheater 4, enters the combustion-supporting air spray pipe 19 through the high-temperature combustion-supporting air introducing channel 16, is sprayed to the throat part of the Laval combustion-supporting air spray pipe 20 from the combustion-supporting air spray pipe 19 and is sprayed out through the swirler 22 at the front end; part of the flue gas discharged by the burner is sucked into the Laval combustion-supporting gas nozzle 20 again by the negative pressure generated by the combustion-supporting air nozzle 19 in the Laval combustion-supporting gas nozzle 20 through the branched flue gas backflow channel 18 to be mixed with the combustion-supporting air sprayed by the combustion-supporting air nozzle 19 to form high-temperature mixed combustion-supporting mixed gas, and the high-temperature mixed combustion-supporting mixed gas is directly sprayed out from the outlet of the Laval combustion-supporting gas nozzle 20, so that the low-nitrogen non-oxidation combustion of the self-preheating flue gas self-circulation burner is realized.
Preferably, the main burner gas nozzle 2 is arranged between the laval combustion-supporting gas nozzle 20 and the dividing wall type air preheater 4 and is directly communicated with the gas distribution ring 9, and the front part of the main burner gas nozzle 2 is arranged in a state of inclining 6-15 degrees towards the center of the burner; the auxiliary burner gas nozzle 14 is arranged in the built-in auxiliary burner 17 in a horizontal state.
Preferably, the built-in auxiliary burner 17 is arranged in the rear cavity of the laval combustion-supporting gas nozzle 20 and is communicated with the gas distribution ring 9 through an auxiliary burner gas conduit 23.
Preferably, a branched flue gas return passage 18 is provided at the rear of the laval combustion-supporting gas nozzle 20, so that a gap formed between the built-in auxiliary burner 17 inserted into the rear space of the laval combustion-supporting gas nozzle 20 and the laval combustion-supporting gas nozzle 20 is communicated with the branched flue gas return passage 18, and an external return utilization passage for discharging flue gas is formed by the tail end of the branched flue gas return passage 18 and the flue gas return passage 21.
Preferably, the built-in auxiliary burner 17 is composed of an ignition electrode 1, an auxiliary burner gas nozzle 14 and an auxiliary burner gas outlet 25, an auxiliary burner combustion air channel 17-1 is arranged on the pipe wall of the built-in auxiliary burner 17, the built-in auxiliary burner 17 is fixed in the inner cavity of the combustion air nozzle 19 through a support plate 26, the auxiliary burner gas nozzle 14 is communicated with the gas inlet 10 through an auxiliary burner gas guide pipe 23 arranged on the pipe body, and the auxiliary burner gas outlet 25 at the front end of the auxiliary burner is arranged in the inner cavity of the built-in auxiliary burner 17 in parallel with the ignition electrode 1; in addition, the combustion-supporting air nozzle 19 is at least provided with two high-temperature combustion-supporting air introducing channels 16 which are vertical to the tube body of the combustion-supporting air nozzle 19, the extending ends of the high-temperature combustion-supporting air introducing channels 16 are communicated with the inner cavity of the dividing wall type air preheater 4, and the obtained high-temperature combustion-supporting air is directly sprayed into the front cavity of the Laval combustion-supporting air nozzle 20 from the combustion-supporting air nozzle 19.
Preferably, the ignition electrode 1 is arranged in a cavity of the built-in auxiliary burner 17.
Preferably, the peephole 11 is arranged in the refractory material 6 of the burner housing 5 between the laval combustion-supporting gas nozzle 20 and the main burner gas nozzle 2.
Preferably, the flue gas return channel is in any one of an annular slit type or a tubular type.
The combustion principle of the self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner is as follows:
1) in the initial ignition stage of the self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner, along with the ignition start of the ignition electrode 1, the built-in auxiliary burner 17 sprays flame to heat combustion air in the combustion air spray pipe 19, the heated combustion air directly rushes into the Laval combustion-supporting air spray pipe 20 through the combustion air spray pipe 19 at a high speed and is sprayed out of a swirler 22 arranged at the front end of the Laval combustion-supporting air spray pipe 20 and is combusted with fuel gas sprayed out of the main burner gas spray pipe 2, and high-temperature flame for carrying out heat treatment on metal is formed at the front end of the whole self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner;
2) the flue gas generated in the combustion is discharged from the flue gas discharge pipe 8 through the flue gas return passage 21. Meanwhile, due to the negative pressure adsorption effect formed by the external spraying of the laval combustion-supporting gas nozzle 20, part of the flue gas generated by the front part of the burner body flows back into the cavity at the front end of the laval combustion-supporting gas nozzle 20 again through the flue gas backflow channel 21 arranged at the outermost ring of the burner shell 5 and the bifurcated flue gas backflow channel 18; during the backflow process, because the flue gas backflow channel 21 is tightly attached to the dividing wall type air preheater 4, the glowing flue gas enables the dividing wall type air preheater 4 to store corresponding heat energy;
3) meanwhile, combustion-supporting air entering from the self-combustion air inlet 15 enters the inner cavity of the dividing wall type air preheater 4 through the rear part of the dividing wall type air preheater 4, the dividing wall type air preheater 4 which is affected by the heat radiation of the flue gas backflow channel 21 carries heat energy, so that the outside normal temperature air entering the inner cavity of the dividing wall type air preheater 4 is preheated, the preheated combustion-supporting air directly enters the auxiliary burner combustion-supporting air channel 24 inside the built-in auxiliary burner 17 through the high-temperature combustion-supporting air introducing channel 16 communicated with the inner cavity of the dividing wall type air preheater 4 to participate in the high-temperature combustion in the auxiliary burner, and enters the cavity at the front end of the laval combustion-supporting air nozzle 20 through the outlet at the front end of the combustion-supporting air nozzle 19 at the outer ring of the auxiliary burner, and therefore the low-nitrogen non-oxidation combustion which is.
The utility model discloses a from low nitrogen non-oxidation nozzle of preheating-type flue gas self-loopa type compares with present universal adoption's ordinary nozzle, has following characteristics:
1) adopt the utility model discloses a nozzle, furnace body need not set up solitary heat exchanger and take heat retaining hot-air line for the furnace body is succinct, and auxiliary assembly is few.
2) The utility model discloses a nozzle can make during partial flue gas self-loopa arrives combustion air, forms the flue gas circulation burning, does not need to install flue gas backflow pipeline and flue gas high temperature blower for the backward flow in addition, convenient operation, and the maintenance cost is low.
3) The utility model discloses a nozzle center is combustion air, and the outside is the gas, and the flame center temperature of burning is low, and difficult production NOx has reduced NOx's formation volume from the source, and the experiment test result shows, the utility model discloses a nozzle is under the full power state, and NOx's formation volume is 1/2 of traditional nozzle, is green nozzle.
4) The utility model discloses a nozzle center is combustion air, and the outside is the gas, and in the combustion process, the outside reductive atmosphere that is weak of flame can reduce by a wide margin the oxidation scaling loss of being heated metal.
Drawings
FIG. 1 is a schematic view of the burner configuration of a self-preheating flue gas self-circulation type low-nitrogen non-oxidizing burner;
FIG. 2 is a rear right view of the self-preheating type flue gas self-circulation burner;
FIG. 3 is a longitudinal cross-sectional view of FIG. 1;
FIG. 4 is a schematic view of the internal structure of the secondary burner;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 6 is a diagram of the arrangement and operation of the technical solution of the present invention in a dual P-type radiant tube;
FIG. 7 is a schematic diagram of the arrangement and operation of the technical scheme of the utility model in the roller hearth heating furnace;
FIG. 8 is a graph showing the influence of the amount of flue gas mixed into combustion air on the flame temperature.
The names of the components in the figure are as follows:
1-an ignition electrode;
2-a main burner gas nozzle;
3-fixing a baffle at the outlet of the burner;
4-dividing wall type air preheater;
5-burner shell;
6-refractory material;
7-burner connecting flange;
8-a flue gas discharge pipeline;
9-a gas distribution ring;
10-a gas inlet;
11-peephole;
12-ignition electrode interface;
13-flame monitoring means;
14-auxiliary burner gas nozzle;
15-combustion air inlet;
16-high temperature combustion air introduction channel;
17-a built-in auxiliary burner;
17.1-auxiliary burner combustion air channel;
18-bifurcated flue gas return passages;
19-combustion air injection pipe;
20-laval combustion-supporting gas injection pipe;
21-flue gas return channel;
22-a cyclone;
23-an auxiliary burner gas conduit;
24-auxiliary burner combustion air channel;
25-auxiliary burner gas outlet;
26-a support plate;
27-dividing wall type preheater outer wall;
28-dividing wall type preheater intermediate baffle;
29-dividing wall type preheater inner wall;
30-double P-type radiant tube body;
31-a block of refractory material;
32-double P-type radiating lugs;
33-smoke external discharging pipe;
34-a gas inlet;
35-combustion air inlet;
36-burner mounting flange;
37-flue gas discharge channel;
38-furnace wall;
39-heated steel plate;
40-furnace roller;
41-a bearing seat;
a-a gas pipeline flange;
b-combustion air pipe flange.
Detailed Description
The utility model provides a from low nitrogen non-oxidizing nozzle of preheating-type flue gas self-loopa type, its core intention lies in following two places:
firstly, a flue gas discharge channel is arranged close to the inner wall of a burner shell, and a dividing wall type air preheater is arranged between the flue gas discharge channel and a main burner gas spray pipe, so that combustion-supporting air entering combustion is preheated to form high-temperature combustion-supporting mixed gas;
and secondly, designing the gas spray pipe of the burner into a main burner gas spray pipe and an auxiliary burner gas spray pipe which are separated, and enabling the main burner gas spray pipe and the auxiliary burner gas spray pipe to form an integrated self-preheating system through the negative pressure adsorption effect of the Laval type gas spray pipe arranged in the burner, the smoke discharge channel and the dividing wall type air preheater.
Fig. 1 to fig. 6 show the structure schematic diagram of the self-preheating flue gas self-circulation type low-nitrogen non-oxidizing burner.
A self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner comprises a burner shell 5, a gas inlet 10, a peephole 11, a burner connecting flange 7, a flue gas discharge pipeline 8, a combustion-supporting air inlet 15, a burner gas spray pipe, an ignition electrode 1, a flame monitoring device 13, an ignition electrode interface 12 and a swirler 22, wherein the gas inlet 10, the peephole 11, the burner connecting flange 7, the flue gas discharge pipeline 8, the combustion-supporting air inlet and the swirler 22 are arranged on the position of the burner shell filled with refractory materials 6; the method is characterized in that: the burner gas spray pipe is composed of a main burner gas spray pipe 2 and an auxiliary burner gas spray pipe 14 which are arranged separately, a Laval combustion-supporting gas spray pipe 20 arranged at the center of a refractory material 6 of a burner shell 5 is taken as the center, the outer side of the main burner gas spray pipe is provided with the main burner gas spray pipe 2 communicated with a gas inlet 10, a flue gas backflow channel 21 is arranged close to the inner wall of the burner shell 5, and a dividing wall type air preheater 4 is arranged between the flue gas backflow channel 21 and the main burner gas spray pipe 2; the auxiliary burner gas spray pipe 14 is arranged in the built-in auxiliary burner 17 at the rear part of the central inner cavity of the Laval combustion-supporting gas spray pipe 20; the raw air entering from the combustion-supporting air inlet 15 exchanges heat with the flue gas discharged from the outer side of the burner body through the dividing wall type air preheater 4, enters the combustion-supporting air spray pipe 19 through the high-temperature combustion-supporting air introducing channel 16, is sprayed to the throat of the Laval combustion-supporting air spray pipe 20 from the combustion-supporting air spray pipe 19 and is sprayed out through the swirler 22 at the front end; part of the discharged flue gas is sucked into the Laval combustion-supporting gas spray pipe 20 again through the branch-type flue gas backflow passage 18 by the negative pressure generated in the Laval combustion-supporting gas spray pipe 20 by the combustion-supporting air spray pipe 19 and is mixed with the combustion-supporting air sprayed from the combustion-supporting air spray pipe 19 to form high-temperature mixed combustion-supporting mixed gas which is directly sprayed out from the outlet of the Laval combustion-supporting gas spray pipe 20, and low-nitrogen non-oxidation combustion of the self-preheating flue gas self-circulation burner is realized.
The main burner gas spray pipe 2 is arranged between the Laval combustion-supporting gas spray pipe 20 and the dividing wall type air preheater 4 and is directly communicated with the gas distribution ring 9, and the front part of the main burner gas spray pipe 2 is arranged in a state of inclining 6-15 degrees towards the center of a burner; the auxiliary burner gas nozzle 14 is arranged in the built-in auxiliary burner 17 in a horizontal state.
The built-in auxiliary burner 17 is arranged in the rear cavity of the Laval combustion-supporting gas nozzle 20 and is communicated with the gas distribution ring 9 through an auxiliary burner gas guide pipe 23.
A bifurcated flue gas backflow channel 18 is arranged at the rear part of the laval combustion-supporting gas spray pipe 20, so that a gap formed between the built-in auxiliary burner 17 inserted in the rear space of the laval combustion-supporting gas spray pipe 20 and the laval combustion-supporting gas spray pipe 20 is communicated with the bifurcated flue gas backflow channel 18, and the gap and the flue gas backflow channel 21 form an external backflow utilization channel for discharging flue gas through the tail end of the bifurcated flue gas backflow channel 18. The structure of the built-in auxiliary burner is shown in the figure 4.
The built-in auxiliary burner 17 consists of an ignition electrode 1, an auxiliary burner gas spray pipe 14 and an auxiliary burner gas spray port 25, an auxiliary burner combustion air channel 17.1 is arranged on the pipe wall of the built-in auxiliary burner 17, the built-in auxiliary burner 17 is fixed in the inner cavity of the combustion air spray pipe 19 through a support plate 26, the auxiliary burner gas spray pipe 14 is communicated with a gas inlet 10 through an auxiliary burner gas guide pipe 23 arranged on the pipe body, and the auxiliary burner gas spray port 25 at the front end of the auxiliary burner is arranged in the inner cavity of the built-in auxiliary burner 17 in parallel with the ignition electrode 1; in addition, the combustion-supporting air nozzle 19 is at least provided with two high-temperature combustion-supporting air introducing channels 16 which are vertical to the tube body of the combustion-supporting air nozzle 19, the extending ends of the high-temperature combustion-supporting air introducing channels 16 are communicated with the inner cavity of the dividing wall type air preheater 4, and the obtained high-temperature combustion-supporting self-supporting air nozzle 19 is directly sprayed into the front cavity of the Laval combustion-supporting air nozzle 20.
The combustion principle of the self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner is as follows:
the preheated combustion-supporting air enters into the Laval combustion-supporting gas spray pipe, is heated by the built-in auxiliary burner and then is sprayed out from the center of the burner at a high speed. The high-speed injected air forms negative pressure (about 400Pa) at the positions of a Laval combustion-supporting gas spray pipe and a flue gas pipe wall channel, partial flue gas is sucked and flows back into the combustion-supporting air, and the flue gas and the combustion-supporting air are mixed to form 'quasi air' to participate in combustion. The gas spray pipe is arranged on the outer side of the burner, namely the gas is coated on the outer layer of combustion air, and the swirler is arranged on the quasi air spray port, so that the quasi air sprayed at a high speed is sprayed outwards in a dispersing way to be mixed with the outer layer of gas for diffusion combustion, and the mixed gas is firstly contacted with hot metal in the diffusion combustion process, so that the burning loss of the hot metal can be reduced. Because the quasi air is mixed with part of the flue gas, the flame temperature in the central area of the burner is reduced, and the high-temperature condition of generating a large amount of NOx is avoided. And simultaneously, the waste heat of the flue gas is utilized to preheat combustion-supporting air, so that the aim of recycling and utilizing the waste heat of the flue gas is fulfilled.
The self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner has the following combustion process:
1) in the initial ignition stage of the self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner, along with the ignition start of the ignition electrode 1, the built-in auxiliary burner 17 sprays flame to heat combustion air in the combustion air spray pipe 19, the heated combustion air directly rushes into the Laval combustion-supporting air spray pipe 20 through the combustion air spray pipe 19 at a high speed and is sprayed out of a swirler 22 arranged at the front end of the Laval combustion-supporting air spray pipe 20 and is combusted with fuel gas sprayed out of the main burner gas spray pipe 2, and high-temperature flame for carrying out heat treatment on metal is formed at the front end of the whole self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner;
2) the flue gas generated in the combustion is discharged from the flue gas discharge pipe 8 through the flue gas return passage 21. Meanwhile, due to the negative pressure adsorption effect formed by the external spraying of the Laval combustion-supporting gas spray pipe 20, part of the flue gas generated by the front part of the burner body flows back into the cavity at the front end of the Laval combustion-supporting gas spray pipe 20 again through a flue gas backflow passage 21 arranged at the outermost ring of the burner shell 5 and the flue gas backflow passage 18; during the backflow process, because the flue gas backflow channel 21 is tightly attached to the dividing wall type air preheater 4, the glowing flue gas enables the dividing wall type air preheater 4 to store corresponding heat energy;
3) meanwhile, combustion-supporting air entering from the self-combustion air inlet 15 enters the inner cavity of the dividing wall type air preheater 4 through the rear part of the dividing wall type air preheater 4, the dividing wall type air preheater 4 which is affected by the heat radiation of the flue gas backflow channel 21 carries heat energy, so that the outside normal temperature air entering the inner cavity of the dividing wall type air preheater 4 is preheated, the preheated combustion-supporting air directly enters the auxiliary burner combustion-supporting air channel 24 inside the built-in auxiliary burner 17 through the high-temperature combustion-supporting air introducing channel 16 communicated with the inner cavity of the dividing wall type air preheater 4 to participate in the high-temperature combustion in the auxiliary burner, and enters the cavity at the front end of the laval combustion-supporting air nozzle 20 through the outlet at the front end of the combustion-supporting air nozzle 19 at the outer ring of the auxiliary burner, and therefore the low-nitrogen non-oxidation combustion which is.
The practical application of the self-preheating type flue gas self-circulation type low-nitrogen non-oxidizing burner provided by the utility model in two industrial furnaces is shown in the attached figures 6 and 7.
Wherein: FIG. 6 is a schematic diagram showing the application state of the self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner in a double-P type radiant tube. The self-preheating type flue gas self-circulation low-nitrogen non-oxidation burner is applied to a double-P type radiant tube, the wall of a central tube of the radiant tube and a dividing wall type heat exchanger of the burner form a flue gas discharge channel 37, and flue gas is discharged from a flue gas outer discharge pipe 33 through the flue gas discharge channel 37. The flue gas discharge channel is connected with the air spray pipe through a flue gas backflow channel, and part of flue gas returns to the burner through the flue gas backflow channel to be mixed with combustion air to form quasi air which enters a combustion area.
FIG. 7 is a schematic view showing the use state of a self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner used for a roller hearth type metal heat treatment furnace.
In practical application, the self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner is fixed on the furnace wall 38 of the roller hearth type metal heat treatment furnace and is respectively arranged above and below the heated steel plate 39. The heated steel sheet 39 is first brought into contact with the fuel flame coated outside and jetted from the burner in the heating process, and the heated steel sheet 39 is in a weak reducing atmosphere, thereby achieving the effect of reducing the oxidation burning loss of the steel sheet. The state of combustion flame in the furnace body can be known on the use site through the ignition electrode 1, the peephole 11 and the flame monitoring device 13 which are arranged at the rear side of each burner body, so that the optimal configuration of gas and combustion-supporting air is guided.
The above general embodiments of the present invention, which are only provided by the applicant according to the technical solutions, are not all the technical solutions, and any improvements that are made by the technicians in this industry with reference to the basic ideas and have no substantial innovation should be considered as belonging to the protection scope of the present invention.
Claims (7)
1. A self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner comprises a burner shell (5), a gas inlet (10) arranged on the position of the burner shell filled with refractory materials (6), a peephole (11), a burner connecting flange (7), a flue gas discharge pipeline (8), a combustion air inlet (15), a burner gas spray pipe, an ignition electrode (1), a flame monitoring device (13), an ignition electrode interface (12) and a swirler (22) arranged at the front end of the burner shell; the method is characterized in that: the burner gas spray pipe is composed of a main burner gas spray pipe (2) and an auxiliary burner gas spray pipe (14) which are arranged separately, the main burner gas spray pipe (2) communicated with a gas inlet (10) is arranged on the outer side of the laval combustion-supporting gas spray pipe (20) which is arranged at the central position of a refractory material (6) of a burner shell (5) and is close to the inner wall of the burner shell (5), and a dividing wall type air preheater (4) is arranged between the flue gas reflux channel (21) and the main burner gas spray pipe (2); the auxiliary burner gas spray pipe (14) is arranged in a built-in auxiliary burner (17) at the rear part of the central inner cavity of the Laval combustion-supporting gas spray pipe (20); thus, the original air entering from the combustion air inlet (15) enters the combustion air nozzle (19) through the high-temperature combustion air guide channel (16) after exchanging heat with the flue gas discharged from the outer side of the burner body through the dividing wall type air preheater (4), the mixed gas is sprayed from a combustion air spray pipe (19) to the throat part of a Laval combustion-supporting gas spray pipe (20) and is sprayed out through a swirler (22) at the front end, part of discharged flue gas is sucked into the Laval combustion-supporting gas spray pipe (20) again through a branched flue gas backflow channel (18) by negative pressure generated in the Laval combustion-supporting gas spray pipe (20) by the combustion-supporting air spray pipe (19) and is mixed with combustion-supporting air sprayed out of the combustion-supporting air spray pipe (19) to form high-temperature mixed combustion-supporting mixed gas, and the high-temperature mixed combustion-supporting mixed gas is directly sprayed out from an outlet of the Laval combustion-supporting gas spray pipe (20), so that low-nitrogen non-oxidation combustion.
2. The self-preheating flue gas self-circulation type low-nitrogen non-oxidation burner as claimed in claim 1, wherein: the main burner gas spray pipe (2) is arranged between the Laval combustion-supporting gas spray pipe (20) and the dividing wall type air preheater (4) and is directly communicated with the gas distribution ring (9), and the front part of the main burner gas spray pipe (2) is arranged in a state of inclining 6-15 degrees towards the center of the burner; the auxiliary burner gas nozzle (14) is arranged in the built-in auxiliary burner (17) in a horizontal state.
3. The self-preheating flue gas self-circulation type low-nitrogen non-oxidation burner as claimed in claim 1, wherein: the built-in auxiliary burner (17) is arranged in the rear cavity of the Laval combustion-supporting gas nozzle (20) and is communicated with the gas distribution ring (9) through an auxiliary burner gas guide pipe (23).
4. The self-preheating flue gas self-circulation type low-nitrogen non-oxidation burner as claimed in claim 1, wherein: a bifurcated flue gas backflow channel (18) is arranged at the rear part of the Laval combustion-supporting gas spray pipe (20), so that a gap formed between a built-in auxiliary burner (17) inserted into the rear space of the Laval combustion-supporting gas spray pipe (20) and the Laval combustion-supporting gas spray pipe (20) is communicated with the bifurcated flue gas backflow channel (18), and an external backflow utilization channel for discharging flue gas is formed by the tail end of the bifurcated flue gas backflow channel (18) and the flue gas backflow channel (21).
5. The self-preheating flue gas self-circulation type low-nitrogen non-oxidation burner as claimed in claim 1, wherein: the built-in auxiliary burner (17) consists of an ignition electrode (1), an auxiliary burner gas spray pipe (14) and an auxiliary burner gas spray port (25), an auxiliary burner combustion air channel (17.1) is arranged on the pipe wall of the built-in auxiliary burner (17), the built-in auxiliary burner (17) is fixed in the inner cavity of the combustion air spray pipe (19) through a support plate (26), the auxiliary burner gas spray pipe (14) is communicated with a gas inlet (10) through an auxiliary burner gas guide pipe (23) arranged on the pipe body, and the auxiliary burner gas spray port (25) at the front end of the auxiliary burner gas spray pipe and the ignition electrode (1) are arranged in the inner cavity of the built-in auxiliary burner (17) in parallel; in addition, the combustion-supporting air spray pipe (19) is at least provided with two high-temperature combustion-supporting air introduction channels (16) which are perpendicular to the pipe body of the combustion-supporting air spray pipe (19), the extending end of each high-temperature combustion-supporting air introduction channel (16) is communicated with the inner cavity of the dividing wall type air preheater (4), and the obtained high-temperature combustion-supporting air self-combustion air spray pipe (19) is directly sprayed into the front cavity of the Laval combustion-supporting air spray pipe (20).
6. The self-preheating flue gas self-circulation type low-nitrogen non-oxidation burner as claimed in claim 1, wherein: the ignition electrode (1) is arranged in a cavity of the built-in auxiliary burner (17).
7. The self-preheating flue gas self-circulation type low-nitrogen non-oxidation burner as claimed in claim 1, wherein: the smoke return channel (21) is in any one of an annular slit type or a tubular type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921511544.9U CN211290049U (en) | 2019-09-11 | 2019-09-11 | Self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921511544.9U CN211290049U (en) | 2019-09-11 | 2019-09-11 | Self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211290049U true CN211290049U (en) | 2020-08-18 |
Family
ID=72020134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921511544.9U Withdrawn - After Issue CN211290049U (en) | 2019-09-11 | 2019-09-11 | Self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211290049U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469851A (en) * | 2019-09-11 | 2019-11-19 | 向顺华 | A kind of low nitrogen non-oxidation burner of self-preheating type flue gas self-circulation type |
| CN112923391A (en) * | 2021-02-25 | 2021-06-08 | 武汉钢铁有限公司 | Air preheater capable of reducing NOx emission of tail gas of heating furnace and using method |
| CN113732278A (en) * | 2021-08-31 | 2021-12-03 | 武汉科虹工业炉有限公司 | Self-preheating ladle baking device with high-speed jet flow heat exchange |
| CN113814383A (en) * | 2021-08-31 | 2021-12-21 | 武汉科虹工业炉有限公司 | Self-preheating tundish baking device with high-speed jet flow heat exchange function |
-
2019
- 2019-09-11 CN CN201921511544.9U patent/CN211290049U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110469851A (en) * | 2019-09-11 | 2019-11-19 | 向顺华 | A kind of low nitrogen non-oxidation burner of self-preheating type flue gas self-circulation type |
| CN110469851B (en) * | 2019-09-11 | 2024-10-18 | 上海炉艺智能科技发展有限公司 | Self-preheating type smoke self-circulation type low-nitrogen non-oxidation burner |
| CN112923391A (en) * | 2021-02-25 | 2021-06-08 | 武汉钢铁有限公司 | Air preheater capable of reducing NOx emission of tail gas of heating furnace and using method |
| CN113732278A (en) * | 2021-08-31 | 2021-12-03 | 武汉科虹工业炉有限公司 | Self-preheating ladle baking device with high-speed jet flow heat exchange |
| CN113814383A (en) * | 2021-08-31 | 2021-12-21 | 武汉科虹工业炉有限公司 | Self-preheating tundish baking device with high-speed jet flow heat exchange function |
| CN113732278B (en) * | 2021-08-31 | 2022-12-16 | 武汉科虹工业炉有限公司 | Self-preheating ladle baking device with high-speed jet flow heat exchange |
| CN113814383B (en) * | 2021-08-31 | 2022-12-16 | 武汉科虹工业炉有限公司 | Self-preheating tundish baking device with high-speed jet flow heat exchange function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211290049U (en) | Self-preheating type flue gas self-circulation type low-nitrogen non-oxidation burner | |
| CN112682791B (en) | Combustion heat exchange assembly and gas water heater | |
| CN110469851B (en) | Self-preheating type smoke self-circulation type low-nitrogen non-oxidation burner | |
| CN202012913U (en) | Novel flue gas self-reflux low-oxygen combustor | |
| CN107883406B (en) | Flameless combustion chamber for Stirling engine and method for implementing the same | |
| CN109307270B (en) | Low NOx self-preheating burner with internal flue gas backflow | |
| CN207716416U (en) | The continous way Self-heat-storage flameless burner of the double preheatings of air/gas | |
| CN107906513A (en) | A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow | |
| CN207539902U (en) | A kind of U-shaped radiant tube combustion device of one-stroke countercurrent flow | |
| CN216176592U (en) | Equipment for baking steel ladle and iron ladle | |
| CN211290051U (en) | Flue gas self-circulation type low-nitrogen non-oxidation burner | |
| CN202125949U (en) | Efficient combustor | |
| CN215723204U (en) | Diffusion type low NOx self-preheating radiant tube burner with flue gas backflow | |
| CN110454786B (en) | Flue gas self-circulation type low-nitrogen non-oxidation burner | |
| CN215808461U (en) | Burner, combustion assembly, combustor and water heater | |
| CN215909042U (en) | Radiant tube burner with high-temperature ejector | |
| CN215062052U (en) | Combustor and water heater | |
| CN210861032U (en) | Novel low-nitrogen energy-saving steam generator | |
| CN208186342U (en) | Low NO is recycled in flue gas | |
| CN209706054U (en) | A kind of concentric jet air single regenerative burner of exotic fuels | |
| CN102032570A (en) | Top-fired high-temperature preheated-air flat-flame burner of hydrogen generation reforming furnace | |
| CN109945192A (en) | A kind of concentric jet air single regenerative burner of exotic fuels | |
| CN111981478A (en) | Low-nitrogen combustor, low-nitrogen combustion system and combustion method thereof | |
| CN113531528B (en) | Low-NOx self-preheating radiant tube burner with smoke backflow diffusion and method | |
| CN211854006U (en) | Vortex spraying type gas burner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200818 Effective date of abandoning: 20241018 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20200818 Effective date of abandoning: 20241018 |