CN109307270B - Low NOx self-preheating burner with internal flue gas backflow - Google Patents
Low NOx self-preheating burner with internal flue gas backflow Download PDFInfo
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- CN109307270B CN109307270B CN201811304914.1A CN201811304914A CN109307270B CN 109307270 B CN109307270 B CN 109307270B CN 201811304914 A CN201811304914 A CN 201811304914A CN 109307270 B CN109307270 B CN 109307270B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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- 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
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Abstract
The application discloses an internal flue gas backflow low NOx self-preheating burner, which is characterized in that a hierarchical fuel gas supply structure is arranged, different combustion modes are arranged according to requirements, meanwhile, an ejector is arranged, and a flue gas backflow hole is correspondingly arranged, so that the combustion air is introduced into the backflow flue gas after passing through the ejector, and is combusted again after being mixed with the combustion air and fuel gas, and after the flue gas and the combustion air are mixed, the local oxygen concentration of the mixture in a combustion chamber and a heating space is reduced, so that the reaction time and the space of fuel are prolonged, a high-temperature region with local severe combustion is not easy to form, the energy of the high-temperature region is reduced, the NOx generation amount is effectively reduced, and the combustion efficiency is improved.
Description
Technical Field
The application relates to the field of self-preheating type burners, in particular to a self-preheating type burner with low NOx in internal flue gas backflow.
Background
Industrial production activities are main causes of energy and environmental problems, and equipment such as industrial furnaces and kilns are main sources of air pollution and high-energy-consumption industrial equipment. The burner is used as one of the most main devices of the industrial kiln, and directly determines the energy consumption and pollutant discharge amount of the industrial kiln.
The self-preheating burner is a typical industrial furnace kiln burner, mainly uses a countercurrent heat exchanger and a high-temperature air combustion technology, wherein the heat exchanger is widely used, the technical principle is well known, and the burner is used as a combustion device and a smoke exhaust device and is performed simultaneously. The high-temperature air combustion technology is mainly characterized in that a certain device or method is utilized to recycle the waste heat of the flue gas and then transmit the recycled waste heat to the combustion air, and the preheated combustion air is mixed with fuel and then subjected to delayed combustion in a low-oxygen atmosphere, so that the formation of a local high-temperature area is effectively reduced.
However, the conventional burner has a single combustion mode, high requirements on materials, and high pollutant generation amount such as NOx and the like is high when the conventional burner is used in the conventional combustion mode with air preheating, so that the environmental protection standard is difficult to meet.
Disclosure of Invention
In order to solve the problems, the application provides the internal flue gas backflow low NOx self-preheating burner, which can realize the switching of various combustion modes according to combustion conditions, improve the combustion efficiency and achieve the purposes of energy conservation and emission reduction.
In order to achieve the above purpose, one of the technical schemes adopted by the application is as follows: the utility model provides an inside flue gas backward flow low NOx self-preheating formula nozzle, which comprises an air pipe, the combustion chamber, the gas passageway, ignition device, the one end of combustion chamber is equipped with the jet orifice, the combustion chamber sets up in the air pipe and the jet orifice extends to outside the air pipe front end, the gas passageway sets up in the air pipe and its one end is fixed on the combustion chamber surface, ignition device's ignition end sets up in the combustion chamber, the air pipe surface has cup jointed the air casing of interior cavity of establishing, the air casing surface is equipped with the air port, the air pipe surface has cup jointed the heat exchanger, the heat exchanger is equipped with straight section pipe in proper order, heat exchange pipe and throat pipe, straight section pipe and air casing's cavity intercommunication, the throat pipe encircles and forms the ring gap in jet orifice department and throat pipe surface outside extension is equipped with the guide duct, the surface of straight section pipe has cup jointed the flue gas casing of establishing the cavity in, flue gas casing surface is equipped with the exhaust port, be equipped with the ejector between straight section pipe and the air pipe, and the ejector surface evenly is equipped with and draws the mouth, straight section pipe surface is equipped with the flue gas reflux hole of intercommunication flue gas casing inner chamber, flue gas reflux hole quantity corresponds with drawing the mouth, and be located the one side of drawing the mouth end in drawing the mouth, be equipped with main gas pipe and auxiliary gas pipe in the gas passageway, main gas pipe sets up in auxiliary gas pipe, auxiliary gas pipe's one end and the outside intercommunication of air pipe, auxiliary gas pipe's the other end is connected with the shunt and sets up in the combustion chamber, the shunt surface is equipped with the reposition of redundant personnel hole of intercommunication combustion chamber and auxiliary gas pipe, main gas pipe's one end and the outside intercommunication of air pipe, main gas pipe other end runs through the shunt and extends to the ejection port department.
Preferably, the combustion device further comprises a wind disc, wherein the wind disc is sleeved on the surface of the flow divider, and an air duct is arranged on the surface of the wind disc along the circumferential direction and is communicated with the combustion chamber and the air pipe.
Preferably, the air channels comprise round air channels and strip-shaped air channels, and the round air channels and the strip-shaped air channels are alternately distributed.
Preferably, a gas shell is arranged outside the air pipe, a main gas port corresponding to the main gas pipe and an auxiliary gas port corresponding to the auxiliary gas pipe are formed in the gas shell, and gas pressure measuring pore plates are arranged at the main gas port and the auxiliary gas port.
Preferably, one end of the fuel gas channel is sleeved with a spring and is fixed on the fuel gas shell outside the air pipe through the spring.
Preferably, an air pressure measuring pore plate is arranged at the air port.
Preferably, the inner wall of the flue gas housing cavity is provided with a heat preservation lining.
Preferably, the flow dividing holes are distributed along the circumferential direction of the flow divider by taking the axial core of the fuel gas channel as the center.
Preferably, the surface of the air shell is also provided with a cooling air inlet, and a blank cap is covered at the cooling air inlet.
In order to achieve the above purpose, the second technical scheme adopted by the application is as follows: the utility model provides an inside flue gas backward flow low NOx self-preheating formula nozzle, which comprises an air pipe, the combustion chamber, the gas passageway, ignition device, the one end of combustion chamber is equipped with the jet orifice, the combustion chamber sets up in the air pipe and the jet orifice extends to outside the air pipe front end, the gas passageway sets up in the air pipe and its one end is fixed on the combustion chamber surface, ignition device's ignition end sets up in the combustion chamber, the air pipe surface has cup jointed the air casing of interior cavity of establishing, the air casing surface is equipped with the air port, the air pipe surface has cup jointed the heat exchanger, the heat exchanger is equipped with straight section pipe in proper order, heat exchange pipe and throat pipe, straight section pipe and air casing's cavity intercommunication, the throat pipe encircles and forms the ring gap in jet orifice department and throat pipe surface outside extension is equipped with the guide duct, the surface of straight section pipe has cup jointed the flue gas casing of establishing the cavity in, flue gas casing surface is equipped with the exhaust port, be equipped with the ejector between throat pipe and the air pipe, and the ejector surface evenly is equipped with and draws the mouth, the throat pipe surface is equipped with and has seted up the flue gas reflux hole, flue gas reflux hole quantity corresponds with drawing the throat, and be arranged in drawing one side of throat end in the mouth, be equipped with main gas pipe and auxiliary gas pipe in the gas passageway, main gas pipe sets up in auxiliary gas pipe, auxiliary gas pipe's one end and the outside intercommunication of air pipe, auxiliary gas pipe's the other end is connected with the shunt and sets up in the combustion chamber, the shunt surface is equipped with the reposition of redundant personnel hole of intercommunication combustion chamber and auxiliary gas pipe, main gas pipe's one end and the outside intercommunication of air pipe, main gas pipe other end runs through the shunt and extends to the jet.
The application has the beneficial effects that:
1. the flow divider is arranged in the combustion chamber, the flow divider is provided with the flow dividing holes, and the main gas pipe and the auxiliary gas pipe are simultaneously arranged and are connected with the gas supply equipment independently, so that independent supply of gas is realized, different combustion modes can be set according to the combustion condition of the burner, the combustion efficiency is improved, the generation of NOx is reduced, and the purposes of energy conservation and emission reduction are achieved;
2. on the premise of gas classification, by combining with an air multi-classification technology, combustion air enters a cavity from an air port and passes through a heat exchanger for heat exchange, a part of the combustion air enters an air pipe to reach a combustion chamber, and is mixed with the gas entering the combustion chamber for combustion to form primary combustion products, the primary combustion products are ejected from an ejection port, a part of the combustion air enters a heating space 2 from an annular air gap and an air guide pipe at a necking pipe, and is mixed with the gas near the ejection port, the primary combustion products and part of backflow flue gas in the heating space 2 for secondary combustion to form high-speed flame, and the high-speed flame can be used for sucking surrounding flue gas for combustion, so that the flame combustion temperature can be effectively reduced, and the generation of NOx is reduced;
3. through being equipped with the ejector, and set up the flue gas reflux hole in straight section pipe or throat pipe department of heat exchanger and draw, the throat end one side of penetrating the throat, after the flue gas reflux is drawn through the flue gas reflux hole, because the combustion air can accelerate blowout and form annular stranded injection air current after penetrating the throat of ejector, introduce the air pipe with flue gas from the flue gas reflux hole, wherein part gets into combustion chamber and combustion air, gas mixing, another part gets into heating space 2 from annular gap and guide duct respectively, after mixing flue gas and combustion air, reduce the local oxygen concentration of mixture in combustion chamber and the heating space, make the reaction time and the space of fuel elongate, be difficult for forming the high temperature region of local violent burning, reduce high temperature region energy, effectively reduce NOx formation volume.
Drawings
FIG. 1 is a sectional view of an internal structure of a first embodiment;
FIG. 2 is an enlarged schematic view of FIG. 1 at I;
FIG. 3 is a schematic structural view of a wind tray;
FIG. 4 is a schematic view of the structure of the ejector;
FIG. 5 is a rear view showing the overall structure of the burner in the first embodiment;
FIG. 6 is a schematic illustration of an installation using direct open flame heating in embodiment one;
FIG. 7 is a schematic illustration of an installation using radiant tube indirect heating in accordance with the first embodiment;
fig. 8 is a schematic structural diagram of the second embodiment.
Detailed Description
Example 1
Referring to fig. 1, the embodiment relates to an internal flue gas recirculation low NOx self-preheating burner, which comprises an air pipe 28, a combustion chamber 43, a fuel gas channel 22, and an ignition device 32, wherein the combustion chamber 43 and the fuel gas channel 22 are all arranged in the air pipe 28; one end of the combustion chamber 43 is provided with a spray outlet 431, the spray outlet 431 extends out of the air pipe 28, the other end of the combustion chamber 43 is provided with a support 23 at the opening, one end of the fuel gas channel 22 is fixedly arranged on the support 23, the combustion chamber 43 is internally provided with an electrode bracket 24, and the ignition end of the ignition device 32 is arranged on the electrode bracket 24; the gas channel 22 is internally provided with a main gas pipe 44 and an auxiliary gas pipe 45, the main gas pipe 44 is arranged in the auxiliary gas pipe 45, one end of the auxiliary gas pipe 45 is connected with a flow divider 451 and is arranged in the combustion chamber 43, the surface of the flow divider 451 is provided with a flow dividing hole 452 communicated with the combustion chamber 43 and the auxiliary gas pipe 45, one end of the main gas pipe 44 penetrates through the flow divider 45 and extends to a spray outlet 431, the air pipe 28 is externally provided with a gas shell 4, and the gas shell 4 is provided with a main gas port 5 communicated with the main gas pipe 44 and an auxiliary gas port 6 communicated with the auxiliary gas pipe 45;
the surface of the air pipe 28 is sleeved with an air shell 9 with a cavity inside, and the surface of the air shell 9 is provided with an air port 10 communicated with the cavity; the surface of the air pipe 28 is sleeved with a heat exchanger, the heat exchanger is sequentially provided with a straight pipe 171, a heat exchange pipe 172 and a necking pipe 173, the straight pipe 171 is communicated with the cavity of the air shell 9, the necking pipe 173 surrounds the ejection port 431 to form a ring gap with the ejection port 431, and the surface of the necking pipe 173 is provided with an air guide pipe 19 extending to the heating space 2; the surface of the straight pipe 171 is sleeved with a flue gas shell 14 with a cavity arranged inside, the surface of the flue gas shell 14 is provided with a flue gas outlet 16, an ejector 34 is arranged between the straight pipe 171 and the air pipe 28, the surface of the ejector 34 is uniformly provided with an ejector shrinkage cavity 35, the surface of the straight pipe 171 is provided with flue gas reflux holes 36 communicated with the inner cavity of the flue gas shell 14, the number of the flue gas reflux holes 36 corresponds to that of the ejector shrinkage cavity 35, and the flue gas reflux holes are positioned on one side of a shrinkage cavity end in the ejector shrinkage cavity 35 (as shown in figures 2 and 4).
In the specific application process of this embodiment, the burner can be directly fixed on the side wall of the heating space 2 through the mounting flange 37, so that the burner extends to the inside of the heating space 2, that is, the burner is realized by adopting a direct open fire heating mounting mode (as shown in fig. 6), meanwhile, a radiant tube 41 can be sleeved on the surface of the burner, that is, the burner is realized by adopting an indirect heating mounting mode (as shown in fig. 7), meanwhile, the main gas port 5 and the auxiliary gas port 6 are provided with a gas pressure measuring pore plate 8, the air port 10 is provided with an air pressure measuring pore plate 12, so that the gas flow and the air flow can be accurately regulated, and the heat load of the burner can be flexibly controlled.
The specific working principle of this embodiment is as follows:
(1) The fuel gas enters the auxiliary gas pipe 45 from the auxiliary gas port 6, flows through the flow dividing hole 452 of the flow divider 451 and then is divided into a plurality of auxiliary gas flows into the combustion chamber 43, and enters the main gas pipe 44 from the main gas port 5 and is directly sprayed out from the spraying port 431 to enter the heating space 2;
(2) Combustion air enters the cavity of the air shell 9 through the air port 10, then sequentially enters the straight tube 171, the heat exchange tube 172 and the necking tube 173 of the heat exchanger through the cavity, and is ejected through the ejector 34 through the straight tube 171 to form a plurality of jet streams, and at the moment, flue gas outside the straight tube 171 is ejected into the air tube 28 through the flue gas reflow hole 36 to be mixed with the combustion air; the mixed air exchanges heat with the flue gas outside the heat exchange tube 172 through the heat exchange tube 172, and is divided into three streams when flowing through the necking tube 173: one return flow enters the combustion chamber 43 from the support 23, one return flow enters the heating space 2 from the annular gap, and one return flow enters the heating space 2 directly from the air guide pipe 19.
(3) The burned flue gas flows back to the outside of the heat exchange tube 171 of the heat exchanger and is divided into three parts: firstly, the combustion products are sucked and mixed near the annular gap to form a new mixture for combustion; secondly, the flue gas is injected into a flue gas reflux hole near the injector 34 and mixed with combustion air; third, the burner is exhausted through the exhaust port 16 on the fume housing 14.
The burner structure can complete air-gas dual-stage combustion, simultaneously complete internal smoke backflow, can switch a flameless mode at a certain temperature, and can furthest reduce the generation of pollutants such as NOx.
The principle is explained below by means of a specific combustion mode.
Three combustion modes can be formed according to the control mode: only auxiliary fuel gas, only main fuel gas and main fuel gas are fed simultaneously, and three heating modes can be respectively corresponding to: low temperature mode, rapid heating, high temperature mode.
Low temperature mode
The ignition device 32 is opened, the auxiliary gas port 6 is opened for air intake, the main gas port 5 is closed, combustion air is not preheated yet, the ignition is started in a cold state for heating, the combustion is complete, a high-temperature area is not generated, and the generation amount of NOx is small; the low-temperature mode burner is operated initially until normal combustion is performed for a period of time, and the furnace temperature is gradually increased from the room temperature; NOx is totally divided into three categories: thermal type, fast type and fuel type, the only thermal type NOx in the NOx produced by the burning of gaseous fuel is dominant, the ratio is 90%, the thermal type NOx is only related to the high temperature area, namely the burning temperature is more than 850 ℃.
Rapid heating mode: the ignition device 32 is opened, the main gas port 5 and the auxiliary gas port 6 are both opened for gas intake, combustion air is preheated, and when rapid heating is needed, the combustion air is subjected to dual-stage combustion at the moment, auxiliary gas, combustion air and smoke in the combustion chamber 43 are mixed and then are ignited by the ignition device 32, the combustion chamber 43 is sprayed out of the spraying port 431 and enters the heating space 2, and the combustion air and smoke mixed gas sprayed into the heating space 2 from the annular gap and main gas sprayed out of the main gas pipe 44 are mixed again and then are continuously combusted in the heating space 2, so that the combustion is sufficient, and the NOx generation amount is low;
high temperature mode: the ignition device 32 is closed, the auxiliary gas port 6 is closed, the main gas port 5 is opened, when the temperature in the heating space 2 is higher (more than 850 degrees), the air-fuel mixture is directly sprayed into the heating space 2, flameless oxidation is integrally carried out, the flameless combustion state is entered, the temperature is uniform, no local high-temperature area exists, and the NOx generation amount is small.
As a preferred embodiment, referring to fig. 3, the present embodiment further includes a wind disc 27, where the wind disc 27 is sleeved on the surface of the splitter 451, the outer edge of the wind disc 27 is provided with a fixing claw 31 and is fixed on the inner wall of the combustion chamber 43 by the fixing claw 31, and the surface of the wind disc 27 is provided with an air duct along the circumferential direction, and the air duct is communicated with the combustion chamber 43 and the air pipe 28. After heat exchange is carried out on the combustion air through the heat exchange pipe 172, a part of the combustion air and the flue gas flow back to the air pipe 28, the combustion air and the flue gas uniformly enter the combustion chamber 43 again through the air flue of the air disc 27, so that the mixing of the combustion air, the flue gas and auxiliary fuel gas in the combustion chamber 43 can be effectively enhanced, the combustion condition is improved, and the air flue is in alternate distribution of the circular air flue B and the strip air flue A for further improving the mixing uniformity of the fuel gas and the combustion air.
As a preferred embodiment, one end of the gas channel 22 is sleeved with the spring 20 and is fixed on the gas housing 4 through the spring 20, so that the safety and stability of the gas system structure can be ensured when the thermal expansion of the burner internal device is shifted, the service life of the whole device and the use safety are further improved, and particularly, in order to prevent the spring 20 from being damaged due to high temperature, the surface of the spring 20 is sleeved with the cooling sleeve 21.
As a preferred embodiment, the inner wall of the flue gas housing cavity 14 is provided with a thermal insulation lining 15 for preventing the high temperature flue gas flowing back from damaging the flue gas housing 14 due to excessive high temperature.
As a preferred embodiment, the surface of the air shell 9 is also provided with a cooling air inlet, and a blank cap 13 is covered at the cooling air inlet. By arranging the cooling air inlet, the cooling air can be introduced to cool the gas pipeline, so that the gas is prevented from being preheated; the slender gas pipeline is protected from thermal deformation, and the combustion effect and flame detection are affected; meanwhile, the primary air quantity entering the combustion chamber can be indirectly regulated, when cooling air is not required to be introduced, the blank cap 13 can be closed, and the burner working condition can be flexibly set.
As a preferred embodiment, the split holes 452 in the splitter 451 are distributed along the circumferential direction of the splitter 451 with the center axis of the gas channel 22 as the center, so that the auxiliary gas entering the combustion chamber 43 can be uniformly distributed and better mixed with the combustion air, so as to improve the combustion efficiency.
As a preferred embodiment, as shown in fig. 5, a flame observation hole and a preformed hole 39 are also arranged on the gas housing 4, wherein the preformed hole 39 can be used for the replacement position of the ignition device in special cases.
As a preferred embodiment, the surface of the ignition device is provided with a sleeve, and the sleeve is provided with a cooling air inlet for protecting the electrode of the ignition device, so that the ignition device cannot be deformed and burnt under the condition of high temperature for a long time, and ignition and detection are not affected.
In the present embodiment, the main gas port 6 and the auxiliary gas port 61 are opened or closed, and can be controlled by an external control system to control the solenoid valve, and the ignition of the ignition device is also controlled by the external control system.
Example two
Referring to fig. 8 and 9, the difference between the present embodiment and the first embodiment is the positions of the ejector and the flue gas recirculation hole. In this embodiment, the ejector is arranged between the air pipe and the necking pipe, and the flue gas reflux hole is arranged on the surface of the necking pipe.
The working principle of the embodiment is different from that of the embodiment in that the combustion air enters the ejector after heat exchange of the straight-section pipe and the heat exchange pipe, so that smoke enters from the smoke reflux hole of the necking pipe and is mixed with the combustion air, the smoke pressure of the necking pipe is close to the furnace pressure, namely, close to zero pressure, the ejection is convenient, the smoke is in micro negative pressure when the straight-section pipe, and the smoke ejection amount is slightly smaller under the condition of the same air pressure.
The above embodiments are merely illustrative of the preferred embodiments of the present application and are not intended to limit the scope of the present application, and various modifications and improvements made by those skilled in the art to the technical solution of the present application should fall within the scope of protection defined by the claims of the present application without departing from the spirit of the design of the present application.
Claims (10)
1. The utility model provides an inside flue gas backward flow low NOx self-preheating formula nozzle, which comprises an air pipe, the combustion chamber, the gas passageway, ignition, the one end of combustion chamber is equipped with the jet orifice, the combustion chamber sets up in the air pipe and the jet orifice extends to outside the air pipe front end, the gas passageway sets up in the air pipe and its one end is fixed on the combustion chamber surface, ignition's ignition end sets up in the combustion chamber, the air pipe surface has cup jointed the air casing of interior cavity of establishing, the air casing surface is equipped with the air port, characterized in that, the air pipe surface has cup jointed the heat exchanger, the heat exchanger is equipped with straight section pipe in proper order, heat exchange pipe and throat pipe, straight section pipe and air casing's cavity intercommunication, the throat pipe encircles in jet orifice department and jet orifice between form the ring gap, and throat pipe surface outside extension is equipped with the guide duct, the surface of straight section pipe has cup jointed the flue gas casing of establishing the cavity in, flue gas casing surface is equipped with the exhaust port, be equipped with the ejector between straight section pipe and the air pipe, and the ejector surface evenly is equipped with and draws the mouth, straight section pipe surface is equipped with the flue gas reflux hole of intercommunication flue gas casing inner chamber, flue gas reflux hole quantity corresponds with drawing the mouth, and be located the one side of drawing the mouth end in drawing the mouth, be equipped with main gas pipe and auxiliary gas pipe in the gas passageway, main gas pipe sets up in auxiliary gas pipe, auxiliary gas pipe's one end and the outside intercommunication of air pipe, auxiliary gas pipe's the other end is connected with the shunt and sets up in the combustion chamber, the shunt surface is equipped with the reposition of redundant personnel hole of intercommunication combustion chamber and auxiliary gas pipe, main gas pipe's one end and the outside intercommunication of air pipe, main gas pipe other end runs through the shunt and extends to the ejection port department.
2. The internal flue gas backflow low NOx self-preheating burner of claim 1, further comprising a wind disc, wherein the wind disc is sleeved on the surface of the flow divider, and the wind disc surface is provided with a wind channel along the circumferential direction, and the wind channel is communicated with the combustion chamber and the air pipe.
3. The internal flue gas recirculation low NOx self-preheating burner of claim 2 wherein the air ducts include circular air ducts and bar-shaped air ducts and the circular air ducts and bar-shaped air ducts are alternately distributed.
4. The internal flue gas backflow low-NOx self-preheating burner nozzle according to claim 1, wherein a gas shell is arranged outside the air pipe, a main gas port corresponding to the main gas pipe and an auxiliary gas port corresponding to the auxiliary gas pipe are formed in the gas shell, and gas pressure measuring pore plates are arranged at the main gas port and the auxiliary gas port.
5. The internal flue gas recirculation low NOx self-preheating burner of claim 4 wherein a spring is sleeved at one end of the gas passage and secured to the gas housing outside the air tube by the spring.
6. The internal flue gas recirculation low NOx self-preheating burner according to claim 1 or 5, wherein an air pressure measuring orifice plate is provided at the air port.
7. The internal flue gas recirculation low NOx self-preheating burner of claim 1, wherein the flue gas housing cavity inner wall is provided with a thermal insulation liner.
8. The internal flue gas recirculation low NOx self-preheating burner of claim 1, wherein the flow dividing holes are distributed in the circumferential direction of the flow divider with the axis of the gas passage as the center.
9. The internal flue gas recirculation low NOx self-preheating burner of claim 1, wherein the air shell surface is further provided with a cooling air inlet, and a cover is covered at the cooling air inlet.
10. The utility model provides an inside flue gas backward flow low NOx self-preheating formula nozzle, which comprises an air pipe, the combustion chamber, the gas passageway, ignition, the one end of combustion chamber is equipped with the jet orifice, the combustion chamber sets up in the air pipe and the jet orifice extends to outside the air pipe front end, the gas passageway sets up in the air pipe and its one end is fixed on the combustion chamber surface, ignition's ignition end sets up in the combustion chamber, the air pipe surface has cup jointed the air casing of interior cavity of establishing, the air casing surface is equipped with the air port, characterized in that, the air pipe surface has cup jointed the heat exchanger, the heat exchanger is equipped with straight section pipe in proper order, heat exchange pipe and throat pipe, straight section pipe and air casing's cavity intercommunication, the throat pipe encircles in jet orifice department and jet orifice between form the ring gap, and throat pipe surface outside extension is equipped with the guide duct, the surface of straight section pipe has cup jointed the flue gas casing of establishing the cavity in, flue gas casing surface is equipped with the exhaust port, be equipped with the ejector between throat pipe and the air pipe, and the ejector surface evenly is equipped with and draws the mouth, the throat pipe surface is equipped with and has seted up the flue gas reflux hole, flue gas reflux hole quantity corresponds with drawing the throat, and be arranged in drawing one side of throat end in the mouth, be equipped with main gas pipe and auxiliary gas pipe in the gas passageway, main gas pipe sets up in auxiliary gas pipe, auxiliary gas pipe's one end and the outside intercommunication of air pipe, auxiliary gas pipe's the other end is connected with the shunt and sets up in the combustion chamber, the shunt surface is equipped with the reposition of redundant personnel hole of intercommunication combustion chamber and auxiliary gas pipe, main gas pipe's one end and the outside intercommunication of air pipe, main gas pipe other end runs through the shunt and extends to the jet.
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| CN201811304914.1A CN109307270B (en) | 2018-11-04 | 2018-11-04 | Low NOx self-preheating burner with internal flue gas backflow |
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| CN201811304914.1A CN109307270B (en) | 2018-11-04 | 2018-11-04 | Low NOx self-preheating burner with internal flue gas backflow |
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| CN109307270B true CN109307270B (en) | 2023-09-12 |
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| 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 |
| CN112682787B (en) * | 2019-10-17 | 2022-10-04 | 芜湖美的厨卫电器制造有限公司 | Combustion heat exchange assembly and gas water heater |
| CN111928243A (en) * | 2020-09-07 | 2020-11-13 | 沈阳锐焰科技有限公司 | Self-preheating low-nitrogen combustor and use method thereof |
| CN114484434A (en) * | 2020-11-11 | 2022-05-13 | 芜湖美的厨卫电器制造有限公司 | Combustor and water heater |
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