CN214370174U - U-shaped radiant tube burner with functions of flue gas backflow, gas classification and premixed combustion - Google Patents
U-shaped radiant tube burner with functions of flue gas backflow, gas classification and premixed combustion Download PDFInfo
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- CN214370174U CN214370174U CN202120243652.3U CN202120243652U CN214370174U CN 214370174 U CN214370174 U CN 214370174U CN 202120243652 U CN202120243652 U CN 202120243652U CN 214370174 U CN214370174 U CN 214370174U
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- 239000007789 gas Substances 0.000 title claims abstract description 112
- 239000003546 flue gas Substances 0.000 title claims abstract description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 title claims description 29
- 238000009413 insulation Methods 0.000 claims abstract description 23
- 239000003034 coal gas Substances 0.000 claims abstract description 13
- 210000001503 joint Anatomy 0.000 claims abstract description 10
- 239000000779 smoke Substances 0.000 claims description 24
- 238000009434 installation Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 239000000446 fuel Substances 0.000 abstract description 6
- 108091006146 Channels Proteins 0.000 abstract 4
- 239000000203 mixture Substances 0.000 description 12
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000000137 annealing Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
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Abstract
The utility model discloses a take flue gas backward flow, coal gas is hierarchical, U type radiant tube nozzle of premixed burning, the flue gas entry of flue gas wind casing and the one end of main nozzle casing respectively with the both ends butt joint intercommunication of U type radiant tube, heat transfer passageway stretches into U type radiant tube and the entry only communicates with combustion-supporting wind entry, export is for establishing the ejector tube in hot air outlet department, the other end of main nozzle casing passes through the end plate and seals, lateral part and hot air outlet butt joint intercommunication, the end plate inboard is equipped with holds the chamber and holds chamber bottom intercommunication and be equipped with secondary gas channel and cubic gas channel, main gas pipe passes the end plate intercommunication and holds the chamber, be connected with the heat insulating board that stretches into U type radiant tube on the main nozzle shells inner wall, pass and be fixed with the premixing passageway on the main nozzle, secondary gas channel export stretches into the premixing passageway, cubic gas channel export is worn out the heat insulating board, what the ignition nozzle was sealed passes the end plate, the heat insulating board, A cavity and a heat insulation plate. The burner has low exhaust gas temperature, low requirement on air-fuel ratio, ultralow NOx exhaust gas and reduced energy consumption.
Description
Technical Field
The utility model belongs to the technical field of the metallurgy, concretely relates to take flue gas backward flow, coal gas classification, mix U type radiant tube nozzle of burning in advance.
Background
At present, the traditional U-shaped self-preheating burner can not meet the requirement of environmental protection on NOx emission, and the existing flue gas backflow technology has the problems of high exhaust gas temperature, high energy consumption relative to the conventional burner and capability of reaching the national NOx emission standard only under the condition of extremely strict air-fuel ratio.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a take flue gas backward flow, coal gas classification, mix the U type radiant tube nozzle of burning in advance, this nozzle exhaust gas temperature is low, require lower, the ultralow NOx to discharge fume to the air-fuel ratio, reduce the energy consumption.
The utility model adopts the technical proposal that:
a U-shaped radiant tube burner with flue gas backflow, coal gas classification and premixed combustion comprises a flue gas and air shell, a heat exchange channel, a main burner shell, a U-shaped radiant tube, a main coal gas tube and an independent ignition burner; the smoke and air shell is provided with a combustion-supporting air inlet, a smoke and air inlet, a hot air outlet and a smoke outlet which are communicated with each other, one end of the smoke and air inlet and one end of the main burner shell are respectively communicated with two ends of the U-shaped radiant tube in a butt joint way, the heat exchange channel extends into the U-shaped radiant tube, the inlet is only communicated with the combustion-supporting air inlet, the outlet is an ejector tube arranged at the hot air outlet, the other end of the main burner shell is sealed by an end plate, the side part is communicated with a hot air outlet in a butt joint mode, an accommodating cavity is formed in the inner side of the end plate, a secondary gas channel and a tertiary gas channel are communicated with the bottom end of the accommodating cavity, the main gas pipe penetrates through the end plate to be communicated with the accommodating cavity, a heat insulation plate stretching into the U-shaped radiant tube is connected to the inner wall of the main burner shell, a premixing channel penetrates through and is fixed on the heat insulation plate, the outlet of the secondary gas channel stretches into the premixing channel, the outlet of the tertiary gas channel penetrates out of the heat insulation plate, and the ignition burner penetrates through the end plate, the accommodating cavity and the heat insulation plate in a sealing mode.
Furthermore, the heat exchange channel comprises a central tube, a finned tube sleeved on the central tube, and a multi-stage jet tube which is positioned in the finned tube and sleeved along the central tube, wherein the front end of the finned tube is communicated with a combustion-supporting air inlet to form an inlet of the heat exchange channel, the rear end of the finned tube extends into the U-shaped radiant tube and is sealed, the front end of the jet tube is open, the outer circle of the front end of the jet tube is plugged with the inner wall of the finned tube through a sealing ring, spray holes are distributed in the side wall of the jet tube, the rear end of the jet tube at the last stage is connected with the outer wall of the central tube through a jet ring, the rear ends of the jet tubes at the other stages are plugged with the outer wall of the central tube, the rear end of the central tube extends to the rear end of the finned tube and is open, and the front end of the central tube is sealed and extends into a hot air outlet and then is connected with the jet tube to form an outlet of the heat exchange channel.
Further, the number of the spray holes on the jet pipe is gradually increased along with the increase of the number of stages.
Furthermore, the ignition burner comprises a mixing shell, and an ignition gas inlet, an ignition air inlet and an ignition air outlet of the mixing shell and an installed ignition electrode are respectively connected with an ignition gas pipe, an ignition air pipe, an ignition burner pipe and a high-pressure bag.
Furthermore, the ignition gas inlet and the ignition air inlet both adopt chutes, and the ignition gas and the ignition air are mixed in the mixing shell after entering the chutes from the pipeline to form swirl gas.
Furthermore, the heat insulation plate is installed in the installation cylinder, the end part of the installation cylinder is connected with the inner wall of the main burner shell, a castable is arranged on one side, close to the heat source, of the heat insulation plate in the installation cylinder, and a premixing channel, a tertiary gas channel and an ignition burner channel are arranged on the castable.
Furthermore, the tertiary gas channel and the premixing channel are uniformly distributed around the ignition burner and are arranged in a staggered mode.
Furthermore, the outlet of the secondary gas channel is provided with an inclined hole and a straight hole, most of the inclined holes are inclined holes, and the outlet of the tertiary gas channel is provided with a straight hole.
Furthermore, sleeves are sleeved on the tertiary gas channel and the ignition burner, one end of each sleeve is sealed with the bottom end of the containing cavity, and the other end of each sleeve is sealed with the heat insulation plate.
Further, the side part of the main burner shell is in butt joint communication with the hot air outlet through an expansion joint.
The utility model has the advantages that:
the burner forms stable and uniform flame under the condition of high furnace temperature, has low smoke discharge temperature, lower requirement on air-fuel ratio and ultralow NOx smoke discharge, and can reduce energy consumption according to different furnace temperatures, because the burner has the following improvements while keeping the inherent advantages of a U-shaped self-preheating burner: 1) the injection pipe is additionally arranged, preheated combustion-supporting air is injected at high speed by the injection pipe, negative pressure is formed in a gap between the hot air outlet and the injection pipe, partial smoke is sucked in, the smoke and the combustion-supporting air are uniformly mixed, the oxygen concentration in the combustion-supporting air is reduced, the intensity of flame combustion is reduced to reduce a local high-temperature area of flame, and therefore NOx is reduced; 2) the premixing channel is added, preheated combustion-supporting air completely passes through the premixing channel, part of coal gas passes through the secondary coal gas channel to be mixed with the preheated combustion-supporting air, so that the combustion-supporting air is excessive according to a certain proportion, the mixture is uniformly mixed and then is ejected out of the premixing channel at a high speed, the premixed gas mixture is ignited by the ignition burner, and the excessive air proportion and the high-speed ejected mixed gas enable the ignited mixed gas to form a combustion reaction without local high temperature or flame, so that the generation of NOx is reduced; 3) an independent tertiary gas channel is added and separated from the premixing channel, and the sprayed gas and a mixture with certain residual oxygen after the combustion reaction of the premixing channel are subjected to the combustion reaction again, so that the generation of NOx is avoided; 4) the independent ignition burner is adopted, the main burner is ignited by the ignition burner when the furnace temperature is low, the ignition burner is extinguished after the furnace temperature reaches a certain temperature, and the premixed air and gas mixture is ignited by the furnace temperature, so that the energy consumption is reduced.
The whole burner adopts a modular design, and the maintenance and the reconstruction are very simple and convenient by using the system; the burner has a large power regulation range, can realize the heating capacity of 40-300 kw in different specifications, can be widely applied to the fields of metallurgical quenching, annealing and heat treatment, and can be applied to furnace bodies such as annealing furnaces, normalizing furnaces, heat treatment furnaces, quenching furnaces, continuous annealing furnaces and the like.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a top view of the installation of the flue gas casing, the main burner casing, the main gas pipe and the ignition burner in the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an ignition electrode in an embodiment of the present invention.
Fig. 4 is a schematic top view of an ignition electrode in an embodiment of the invention.
Fig. 5 is an installation schematic diagram of the flue gas and air shell and the heat exchange channel in the embodiment of the present invention.
Fig. 6 is an installation schematic diagram of a main gas pipe, an ignition burner, an end plate, a containing cavity, a secondary gas channel, a tertiary gas channel and a sleeve pipe in the embodiment of the invention.
Fig. 7 is an installation schematic diagram of the installation barrel, the heat insulation plate, the premixing channel and the pouring material in the embodiment of the present invention.
In the figure: 1-a smoke wind shell; 101-combustion-supporting air inlet; 102-a hot air outlet; 103-smoke outlet; 104-flue gas inlet; 2-heat exchange channels; 201-an injection pipe; 202-a seal ring; 203-a central tube; 204-jet pipe; 205-finned tubes; 206-jet ring; 3-an expansion joint; 4-secondary gas channel; 5-igniting the burner; 501-mixing shell; 502-an ignition electrode; 503-ignition air inlet; 504-ignition gas inlet; 505-firing burner tube; 6-main gas pipe; 7-an end plate; 8-containing cavity; 9-three times of gas channels; 10-a main burner housing; 11-mounting the barrel; 12-a premix passage; 13-a sleeve; 14-a heat insulation plate; 15-casting material; 16-U type radiant tube.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 to 7, a U-shaped radiant tube burner with flue gas backflow, gas classification and premixed combustion comprises a flue gas and air shell 1, a heat exchange channel 2, a main burner shell 10, a U-shaped radiant tube 16, a main gas tube 6 and an independent ignition burner 5; a combustion-supporting air inlet 101, a smoke inlet 104, a hot air outlet 102 and a smoke outlet 103 which are communicated with each other are arranged on the smoke air shell 1, one end of the smoke inlet 104 and one end of a main burner shell 10 are respectively in butt joint communication with two ends of a U-shaped radiant tube 16, a heat exchange channel 2 extends into the U-shaped radiant tube 16, the inlet is only communicated with the combustion-supporting air inlet 101, the outlet is an injection tube 201 arranged at the hot air outlet 102, the other end of the main burner shell 10 is sealed by an end plate 7, the side part of the main burner shell is in butt joint communication with the hot air outlet 102, a containing cavity 8 is arranged on the inner side of the end plate 7, a secondary gas channel 4 and a tertiary gas channel 9 are arranged at the bottom end of the containing cavity 8 in a communicating manner, a main gas tube 6 penetrates through the end plate 7 to be communicated with the containing cavity 8, a heat insulation plate 14 extending into the U-shaped radiant tube 16 is connected to the inner wall of the main burner shell 10, a premixing channel 12 penetrates through and is fixed on the heat insulation plate 14, the outlet of the secondary gas channel 4 extends into the premixing channel 12, and the outlet of the tertiary gas channel 9 penetrates through 14 and the outlet 14 (the outlet of the tertiary gas channel 9 is also penetrates through the outlet of the premixing channel 12 Close to the heat source) the ignition burner 5 is sealed through the end plate 7, the cavity 8 and the heat shield 14.
As shown in fig. 1 and 2, in the present embodiment, the side portion of the main burner housing 10 is in butt-joint communication with the hot air outlet 102 via the expansion joint 3.
As shown in fig. 1 and fig. 5, in this embodiment, the heat exchange channel 2 includes a central tube 203, a finned tube 205 sleeved on the central tube 203, and a multi-stage jet pipe 204 located inside the finned tube 205 and sleeved along the central tube 203 (the number of stages of the jet pipe 204 is set according to actual needs, in this embodiment, a four-stage jet pipe 204 is set along the central tube 203), the front end of the finned tube 205 is communicated with the combustion-supporting air inlet 101 to form an inlet of the heat exchange channel 2, the rear end of the finned tube 205 extends into the U-shaped radiant tube 16 and is sealed, the front end of the jet pipe 204 is open, the outer circle of the front end is sealed with the inner wall of the finned tube 205 by a sealing ring 202, and spray holes are distributed on the side wall, the rear end of the jet pipe 204 at the last stage is connected with the outer wall of the central tube 203 by a jet ring 206, the rear ends of the jet pipes 204 at the other stages are sealed with the outer wall of the central tube 203, the rear end of the central tube 203 extends into the hot air outlet 102 and is open, and connected with the jet pipe 201 to form an outlet of the heat exchange channel 2, the heat exchange channel 2 adopts a jet flow heat exchange structure, and combustion-supporting air is in full contact with the finned tube 205 step by step through the jet flow tube 204, so that full heat exchange is realized; as shown in fig. 5, in this embodiment, the number of orifices on the jet pipe 204 gradually increases with the increase of the number of stages, so as to ensure that the resistance of the combustion-supporting air after heat exchange expansion is equal, and improve the energy utilization rate.
As shown in fig. 1 and 6, in the present embodiment, the sleeve 13 is sleeved on both the tertiary gas passage 9 and the ignition burner 5, one end of the sleeve 13 is sealed from the bottom end of the cavity 8, and the other end is sealed from the heat insulation plate 14, so as to ensure that most of the preheated combustion-supporting air is sprayed out through the premixing passage 12. As shown in fig. 6, in the present embodiment, the outlet of the secondary gas channel 4 is provided with an inclined hole and a straight hole, most of the inclined holes (for example, the area of the inclined hole accounts for 70%, the area of the straight hole accounts for 30%), and the outlet of the tertiary gas channel 9 is provided with a straight hole.
As shown in fig. 1 and 7, in the present embodiment, a heat shield 14 is installed in an installation cylinder 11, an end of the installation cylinder 11 is connected to an inner wall of a main burner housing 10, a castable 15 is provided on a side of the heat shield 14 in the installation cylinder 11 close to a heat source, and a premix passage 12, a tertiary gas passage 9, and a passage of an ignition burner 5 are provided on the castable 15. In the embodiment, the tertiary gas channels 9 and the premixing channels 12 are uniformly distributed around the ignition burner 5 and are arranged in a staggered mode, and the number of the premixing channels 5 can be controlled to be 2-3.
As shown in fig. 3 and 4, in the present embodiment, the ignition burner 5 includes a mixing housing 501, and an ignition gas inlet 504, an ignition air inlet 503, an outlet of the mixing housing 501, and an ignition electrode 502 mounted thereon are connected to an ignition gas pipe, an ignition air pipe, an ignition burner pipe 505, and a high pressure bag, respectively. In this embodiment, the ignition gas inlet 504 and the ignition air inlet 503 both use chutes, and the ignition gas and the ignition air enter the chutes from the pipeline and are mixed in the mixing housing 501 to form swirling gas, so as to form a stable flame structure.
The components are generally connected by a conventional connection mode: the end plate 7 is fixedly connected with the main burner shell 10 through a flange, a bolt and a sealing gasket, the flue gas inlet 104 and one end of the main burner shell 10 are fixedly connected with two ends of the U-shaped radiant tube 16 through the flange, the bolt and the sealing gasket respectively, the ignition burner 5 is fixedly welded on the end plate 7, the secondary gas channel 4 and the tertiary gas channel 9 are welded at the bottom end of the accommodating cavity 8, one end of the main gas tube 6 is turned into threads, the other end of the main gas tube is welded to an opening of the end plate 7 in a chamfering mode, and the premixing channel 12 is fixedly welded on the heat insulation plate 14.
Selection of materials and dimensions of the components: the end plate 7 is processed and formed by adopting high-temperature-resistant alloy; the ball head and part of the closed end of the finned tube 205 are made of 0Cr28Ni48W5, the finned tube is not oxidized when being used at 1180 ℃ in a normal period, the continuous use temperature is 1250 ℃, the maximum temperature is 1350 ℃, and the other positions are made of 0Cr25Ni 20; the ignition electrode 502 adopts a ferrite aluminum alloy wire and 95% of alumina ceramic, the 95% of alumina ceramic is insulated and high temperature resistant, the long-term use temperature of the ferrite aluminum alloy is not lower than 1250 ℃, the surface oxidation rate is low under the high temperature condition, and the strength is high; the ignition gas inlet 504 and the ignition air inlet 503 are formed by brass precision machining, and the aperture of the straight hole, the pipe diameter of the pipeline and the size of the chute are determined by the power of the burner and the fuel components; the premixing channel 12, the heat insulation plate 14 and the mounting barrel 11 are all formed by machining 0Cr25Ni20, and are formed by fine machining, wherein the normal use temperature is 1000 ℃, the continuous use temperature is 1150 ℃, the maximum temperature is 1250 ℃, the casting material 15 is formed by a heavy material casting material, the normal use temperature is 1380 ℃, the continuous use temperature is 1450 ℃, and the maximum use temperature is 1650 ℃; the secondary gas channel 4 is formed by processing a 0Cr25Ni20 pipeline and a bar, the total aperture area of the secondary gas channel 4 is determined by the burner power, the gas flow and the components, the oblique angle of the oblique hole is determined according to the inner diameter of the premixing channel 12 and the distance of the secondary gas channel 4 penetrating into the premixing channel, and the number of the oblique holes of the secondary gas channel 4 is determined by the diameter of the gas nozzle; the third gas channel 9 is formed by processing 0Cr25Ni20 and 0Cr28Ni48W5 pipelines and bars, and the length of the third gas channel 9, which is deeper than the heat insulation plate 14, is determined according to the inner diameter of the U-shaped radiant tube 16 and the flow rate of the air gas mixture.
When the burner works, the smoke air shell 1, the main burner shell 10 and the U-shaped radiant tube 16 are installed on a furnace body, a combustion air inlet 101 is connected with a combustion air pipe, valves for adjusting air gas flow and proportion are arranged on the main gas pipe 6, the combustion air pipe, the ignition gas pipe and the ignition air pipe, before the ignition burner 5 is started, the ignition gas pipe and the valves on the ignition air pipe are adjusted to proper positions, when the ignition burner 5 is started, the high-pressure bag discharges to ignite the ignition electrode 502, meanwhile, the valves on the ignition gas pipe are opened, gas is introduced into the ignition burner 5 to be mixed and combusted with the ignition air which is introduced all the time to form stable and specific flame, then the main gas pipe 6 is opened after the combustion air pipe is opened for a certain time, the ignition burner 5 ignites the main burner, after the temperature of a hearth rises, the ignition burner 5 is closed, the gas conveyed by the secondary gas passage 4 and the injected gas are premixed and sprayed out in the premixing passage 12, igniting through the high-temperature atmosphere in the U-shaped radiant tube 16, reducing local high temperature of flame by excessive air in the first step of combustion to reduce NOx generation, reducing oxygen concentration in combustion-supporting air by introducing inert gas in flue gas on the basis of the first step of combustion to reduce local high temperature of flame to reduce NOx generation, and combusting residual oxygen and coal gas in the mixture after burner nozzle on the basis of the first step and the second step of combustion to further reduce NOx generation and reduce flue gas temperature emission, wherein the flame temperature is uniformly distributed, NO is generatedxThe emission amount is small.
The burner forms stable and uniform flame under the condition of high furnace temperature, has low smoke discharge temperature, lower requirement on air-fuel ratio and ultralow NOx smoke discharge, and can reduce energy consumption according to different furnace temperatures, because the burner has the following improvements while keeping the inherent advantages of a U-shaped self-preheating burner: 1) the injection pipe 201 is additionally arranged, preheated combustion-supporting air is injected at a high speed from the injection pipe 201, negative pressure is formed in a gap between the hot air outlet 102 and the injection pipe 201, partial smoke is sucked in an entrainment mode, the smoke and the combustion-supporting air are uniformly mixed, the oxygen concentration in the combustion-supporting air is reduced, the intensity of flame combustion is reduced, and the local high-temperature area of flame is reduced, so that the generation of NOx is reduced; 2) the premixing channel 12 is added, preheated combustion-supporting air completely passes through the premixing channel 12, part of coal gas is mixed with the preheated combustion-supporting air through the secondary coal gas channel 4, so that the combustion-supporting air is excessive according to a certain proportion, the mixture is uniformly mixed and then is ejected out of the premixing channel 12 at a high speed, the premixed gas mixture is ignited by the ignition burner 5, the excessive air proportion and the mixed gas ejected out at a high speed enable the ignited mixed gas to form a combustion reaction without local high temperature or flame, and therefore NOx generation is reduced; 3) an independent tertiary gas channel 9 is added, the tertiary gas channel 9 is separated from the premixing channel 12, and the sprayed gas and a mixture with certain residual oxygen after the combustion reaction of the premixing channel 12 generate the combustion reaction again, so that the generation of NOx is avoided; 4) the independent ignition burner 5 is adopted, the main burner is ignited by the ignition burner 5 at a low furnace temperature, the ignition burner 5 is extinguished after the furnace temperature reaches a certain temperature, and the premixed air-gas mixture is ignited by the furnace temperature, so that the energy consumption is reduced.
The whole burner adopts a modular design, and the maintenance and the reconstruction are very simple and convenient by using the system; the burner has a large power regulation range, can realize the heating capacity of 40-300 kw in different specifications, can be widely applied to the fields of metallurgical quenching, annealing and heat treatment, and can be applied to furnace bodies such as annealing furnaces, normalizing furnaces, heat treatment furnaces, quenching furnaces, continuous annealing furnaces and the like.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. The utility model provides a take flue gas backward flow, coal gas classification, U type radiant tube nozzle of premixed combustion which characterized in that: the device comprises a smoke and air shell, a heat exchange channel, a main burner shell, a U-shaped radiant tube, a main gas tube and an independent ignition burner; the smoke and air shell is provided with a combustion-supporting air inlet, a smoke and air inlet, a hot air outlet and a smoke outlet which are communicated with each other, one end of the smoke and air inlet and one end of the main burner shell are respectively communicated with two ends of the U-shaped radiant tube in a butt joint way, the heat exchange channel extends into the U-shaped radiant tube, the inlet is only communicated with the combustion-supporting air inlet, the outlet is an ejector tube arranged at the hot air outlet, the other end of the main burner shell is sealed by an end plate, the side part is communicated with a hot air outlet in a butt joint mode, an accommodating cavity is formed in the inner side of the end plate, a secondary gas channel and a tertiary gas channel are communicated with the bottom end of the accommodating cavity, the main gas pipe penetrates through the end plate to be communicated with the accommodating cavity, a heat insulation plate stretching into the U-shaped radiant tube is connected to the inner wall of the main burner shell, a premixing channel penetrates through and is fixed on the heat insulation plate, the outlet of the secondary gas channel stretches into the premixing channel, the outlet of the tertiary gas channel penetrates out of the heat insulation plate, and the ignition burner penetrates through the end plate, the accommodating cavity and the heat insulation plate in a sealing mode.
2. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 1, wherein: the heat exchange channel comprises a central tube, finned tubes sleeved on the central tube and multi-stage jet tubes positioned in the finned tubes and sleeved along the central tube, wherein the front ends of the finned tubes are communicated with a combustion-supporting air inlet to form an inlet of the heat exchange channel, the rear ends of the finned tubes extend into the U-shaped radiant tube and are sealed, the front ends of the jet tubes are opened, the outer circles of the front ends of the jet tubes are plugged with the inner wall of the finned tubes through sealing rings, spray holes are distributed in the side walls of the jet tubes, the rear ends of the jet tubes at the last stage are connected with the outer wall of the central tube through jet rings, the rear ends of the jet tubes at the other stages are plugged with the outer wall of the central tube, the rear ends of the central tube extend to the rear ends of the finned tubes and are opened, and the front ends of the central tube are sealed and extend into a hot air outlet and then are connected with the jet tubes to form an outlet of the heat exchange channel.
3. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 2, wherein: the number of the spray holes on the jet pipe is gradually increased along with the increase of the number of stages.
4. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 1, wherein: the ignition burner comprises a mixing shell, wherein an ignition gas inlet, an ignition air inlet and an ignition outlet of the mixing shell and an installed ignition electrode are respectively connected with an ignition gas pipe, an ignition air pipe, an ignition burner pipe and a high-pressure bag.
5. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 4, wherein: the ignition coal gas inlet and the ignition air inlet both adopt chutes, and the ignition coal gas and the ignition air are mixed in the mixing shell after entering the chutes from the pipeline to form swirl gas.
6. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 1, wherein: the heat insulation plate is arranged in the installation cylinder, the end part of the installation cylinder is connected with the inner wall of the main burner shell, a castable is arranged on one side, close to a heat source, of the heat insulation plate in the installation cylinder, and a premixing channel, a tertiary gas channel and an ignition burner channel are arranged on the castable.
7. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 1, wherein: the tertiary gas channel and the premixing channel are uniformly distributed around the ignition burner and are arranged in a staggered mode.
8. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 1, wherein: the secondary gas channel outlet is provided with an inclined hole and a straight hole, most of the inclined holes are inclined holes, and the tertiary gas channel outlet is provided with a straight hole.
9. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 1, wherein: the tertiary gas channel and the ignition burner are sleeved with sleeves, one end of each sleeve is sealed with the bottom end of the containing cavity, and the other end of each sleeve is sealed with the heat insulation plate.
10. The U-shaped radiant tube burner with flue gas recirculation, gas classification and premixed combustion as claimed in claim 1, wherein: the side part of the main burner shell is communicated with the hot air outlet in a butt joint mode through an expansion joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120243652.3U CN214370174U (en) | 2021-01-28 | 2021-01-28 | U-shaped radiant tube burner with functions of flue gas backflow, gas classification and premixed combustion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120243652.3U CN214370174U (en) | 2021-01-28 | 2021-01-28 | U-shaped radiant tube burner with functions of flue gas backflow, gas classification and premixed combustion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214370174U true CN214370174U (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120243652.3U Active CN214370174U (en) | 2021-01-28 | 2021-01-28 | U-shaped radiant tube burner with functions of flue gas backflow, gas classification and premixed combustion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115435322A (en) * | 2022-08-30 | 2022-12-06 | 华中科技大学 | Injection type self-preheating porous medium burner system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115435322A (en) * | 2022-08-30 | 2022-12-06 | 华中科技大学 | Injection type self-preheating porous medium burner system |
| CN115435322B (en) * | 2022-08-30 | 2024-06-04 | 华中科技大学 | Injection type self-preheating porous medium burner system |
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