CN111981478A - Low-nitrogen combustor, low-nitrogen combustion system and combustion method thereof - Google Patents
Low-nitrogen combustor, low-nitrogen combustion system and combustion method thereof Download PDFInfo
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- CN111981478A CN111981478A CN201910435490.0A CN201910435490A CN111981478A CN 111981478 A CN111981478 A CN 111981478A CN 201910435490 A CN201910435490 A CN 201910435490A CN 111981478 A CN111981478 A CN 111981478A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 84
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 67
- 238000009841 combustion method Methods 0.000 title claims abstract description 8
- 239000002912 waste gas Substances 0.000 claims abstract description 150
- 239000007789 gas Substances 0.000 claims abstract description 135
- 230000002093 peripheral effect Effects 0.000 claims abstract description 14
- 239000002737 fuel gas Substances 0.000 claims description 15
- 239000000779 smoke Substances 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000003546 flue gas Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000010285 flame spraying Methods 0.000 claims description 2
- 239000007800 oxidant agent Substances 0.000 claims 2
- 230000001590 oxidative effect Effects 0.000 claims 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 58
- 238000004064 recycling Methods 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- 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
- F23D14/66—Preheating the combustion air or gas
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides a low-nitrogen burner which comprises an outer tube and an inner tube, wherein one end of the outer tube is a fire outlet end, the other end of the outer tube is a gas inlet end, a combustion-supporting gas interface is arranged at the gas inlet end, the inner tube penetrates into the outer tube, a gas interface is arranged on the inner tube, the low-nitrogen burner comprises a waste gas resorption structure, the waste gas resorption structure comprises a waste gas resorption tube cover and a waste gas exhaust device, the waste gas resorption tube cover is arranged on the outer peripheral wall of the fire outlet end of the outer tube and is provided with a waste gas resorption hole, the waste gas exhaust device is connected with the waste gas resorption tube cover, the waste gas exhaust device exhausts air, waste gas which circles to the rear part of the fire outlet end after combustion is absorbed into the waste gas resorption tube cover and is conveyed into the fire outlet end of the outer tube, and the conveyed back waste gas is mixed with combustion-supporting gas guided into the outer tube and gas guided into the. The invention also provides a low-nitrogen combustion system and a combustion method thereof. The low-nitrogen combustor has the advantages of energy conservation and low nitrogen.
Description
Technical Field
The invention relates to the technical field of low-nitrogen combustion of gas boilers, in particular to a low-nitrogen combustor, a low-nitrogen combustion system and a combustion method of the low-nitrogen combustor.
Background
In recent years, the economic growth of China is rapid, the energy consumption is remarkably improved, and the problem of environmental pollution caused by the energy consumption is increasingly severe. During the combustion process, a large amount of nitrogen oxides (NOx) are generated, causing serious damage to the ecological environment. Therefore, the environmental protection sector is also demanding more and more on the emission limits of the pollutants produced by combustion.
At present, in an industrial furnace, a burner is installed on a furnace body to heat in a hearth, a burner nozzle of the burner faces into the furnace body, combustion-supporting gas is input through a combustion-supporting pipe of the burner, fuel is input through a fuel pipe, and the combustion-supporting gas and the fuel are mixed at the burner nozzle and then ignited to burn, so that the heating is realized by burning flame in the hearth. The flame temperature is higher, the generation amount of nitrogen oxides is also high, the general combustion temperature exceeds 350 degrees, more nitrogen oxides can be generated, and most of the current local environmental protection authorities have strict emission control requirements on the emission of the nitrogen oxides, such as the emission standard of the nitrogen oxides discharged by a newly-built boiler, which is provided in the CN106594716 background technology. The smoke recirculation technology is a technology which is commonly adopted at present to reduce the flame temperature, can reduce the generation amount of nitrogen oxides, namely, exhaust waste gas is sucked into a combustion chamber of a combustor, thereby reducing the oxygen concentration and reducing the temperature during combustion, the flue gas recycling technology is disclosed in CN106594716 patent and CN106287696 patent technologies and the like, the structure principle is mostly shown in figure 1, a waste gas recycling pipe 2A is directly connected at a smoke outlet of a hearth 1A to absorb a large amount of waste gas at the smoke outlet and guide the waste gas into a combustor 3A, the waste gas is mixed with combustion-supporting gas and fuel gas for combustion, because the oxygen content in the waste gas is less and the contents of non-combustion-supporting carbon dioxide, nitrogen oxide and the like are more, the concentration of the oxygen in the combustion-supporting gas in the combustion chamber can be reduced, the combustion temperature is lowered during the combustion, so that the generation of nitrogen oxides is reduced, and the emission of the nitrogen oxides is controlled. Among the above-mentioned flue gas recirculation mode, the flue gas department of waste gas circulation return pipe connection furnace rear end and the combustor of furnace front end, the pipe length of waste gas circulation return pipe is very long, and exposes in external environment, when external temperature is lower, or when the boiler suspends the use, easily forms the comdenstion water in the vapor in the intraductal waste gas, especially in northern winter, the vapor condensation of condensation is long-pending at the easy corrosion pipeline of pipe wall, and the waste gas circulation return pipe often needs the maintenance to be changed. In addition, the arrangement of the waste gas recycling pipe needs a large site space, and waste gas recycling pipelines with large areas are arranged on boilers, so that the overall structure is complex, the investment is improved, and the construction, installation and maintenance and management after installation are not convenient.
Disclosure of Invention
In view of the foregoing, the present invention provides a low-nitrogen burner that is durable and does not require maintenance to replace the exhaust gas recirculation pipe.
The technical solution scheme involved in the invention is as follows:
a low-nitrogen burner comprises an outer tube and an inner tube, wherein one end of the outer tube is a fire outlet end, the other end of the outer tube is a gas inlet end, the gas inlet end is provided with a combustion-supporting gas interface, the inner tube penetrates into the outer tube, the inner tube is provided with a gas interface for the combustion-supporting gas led in by the outer tube and the gas led in by the inner tube to be mixed in the fire outlet end of the outer tube and then ignited and burnt, the low-nitrogen burner comprises a waste gas resorption structure, the waste gas resorption structure comprises a waste gas resorption pipe cover and a waste gas exhaust device, the waste gas resorption pipe cover is arranged on the peripheral wall of the fire outlet end of the outer tube and is provided with waste gas resorption holes, the waste gas exhaust device is connected with the waste gas resorption pipe cover and is used for exhausting, the waste gas which is convoluted to the rear part of the fire outlet end after burning is absorbed into the waste gas resorption pipe cover and is conveyed into the fire outlet end of the outer tube, the conveyed back waste gas is mixed, and burning in the fire outlet end.
Further, the waste gas resorption structure includes the waste gas back flow, and the waste gas back flow penetrates in the inner tube, and exhaust gas updraft ventilator passes through pipeline one end and is connected to waste gas resorption pipe cover, and the other end is connected with the waste gas back flow.
Further, the fire outlet end is provided with a combustion space section, the inner pipe barrel is provided with an air outlet end, the outer peripheral wall of the air outlet end is connected with a premixing pipe, and the other end of the premixing pipe extends to the combustion space section.
Further, the air outlet end of the inner tube extends to the adjacent position of the premixing tube, and the waste gas return pipe extends to the adjacent position of the combustion space section.
Furthermore, premixing pipe one end is formed with the periphery wall rigid coupling of interior terminal edge and the inner tube section of thick bamboo end of giving vent to anger, and the other end is formed with outer terminal edge and the internal perisporium rigid coupling of outer tube section of thick bamboo, has seted up the air vent on the interior terminal edge to make the combustion-supporting gas portion that gets into in the outer tube section of thick bamboo get into in premixing, has seted up the gas pocket on the outer terminal edge, so that the combustion-supporting gas portion that gets into in the outer tube section of thick bamboo gets into to burn in.
Further, the air passing hole adopts a spiral pore channel structure.
Furthermore, the waste gas resorption structure further comprises a heat exchanger, the heat exchanger is provided with a first air inlet interface and a first air outlet interface, a second air inlet interface and a second air outlet interface, the first air inlet interface is connected with the air outlet interface of the waste gas resorption pipe cover, the first air outlet interface is connected with the waste gas air extraction device, a combustion-supporting gas conveying device is connected to the second air inlet interface, and the second air outlet interface is connected to the combustion-supporting gas interface.
The utility model provides a low nitrogen combustion system, includes the furnace body and installs the low nitrogen combustor on the furnace body, and the furnace body has furnace, has seted up the burner hole on the front side oven of furnace body, and the top of furnace body is close to the rear side oven wall and is provided with the smoke window to supply the exhaust after the burning in the furnace, the low nitrogen combustor adopt the low nitrogen combustor, it is installed on the front side oven of furnace body, and the port of the play fire end of outer tube stretches into to the furnace in.
A combustion method adopting the low-nitrogen combustion system comprises the following steps:
starting the combustion-supporting gas conveying device, the fuel gas conveying device and the waste gas exhaust device, filling fuel gas into the inner pipe barrel through the fuel gas interface, and filling combustion-supporting gas into the outer pipe barrel through the combustion-supporting gas interface;
premixing fuel gas and combustion-supporting gas, igniting the premixed gas, and fully combusting in a combustion space section at a fire outlet end;
the flame that the burning produced sprays in going out the fire end to furnace body furnace, forms in furnace with flame blowout opposite direction and the waste gas backward flow that forms after the flame burning, and the waste gas backward flow is in the waste gas suction pipe cover that outer tube goes out the fire end through exhaust updraft ventilator suction to carry to the waste gas back flow, flow back to in the combustion space section of the play fire end of outer tube.
The combustion method of the low-nitrogen combustion system comprises the following steps: when the low-nitrogen combustion system is provided with the heat exchanger, the combustion-supporting gas conveying device conveys the combustion-supporting gas to enter the outer pipe barrel after passing through the heat exchanger, the waste gas enters the waste gas return pipe after passing through the waste gas return suction pipe cover, and the combustion-supporting gas and the waste gas realize heat exchange.
Compared with the traditional low-nitrogen combustion device, the low-nitrogen combustor has the advantages that the waste gas suck-back structure is arranged at the fire outlet end, can fully absorb and recycle the convoluted waste gas, meet the requirement of reducing the combustion temperature, meet the control on the generation amount of nitrogen oxides, fully break through the traditional thought that the waste gas is concentrated and collected at the smoke outlet and cannot return to the vicinity of the fire outlet end, because the smoke exhaust port is far away from the fire outlet end, otherwise the smoke exhaust port can directly exhaust the combustion heat, the application learns that the combustion waste gas part can be convoluted to the vicinity of the fire outlet end (namely the periphery of the outer tube), so, design the aforesaid and set up waste gas resorption structure in the end periphery of going out a fire, the waste gas in the resorption furnace can reach the formation volume that restraines nitrogen oxide equally, and satisfies the required temperature effect of furnace. Compare in prior art, can avoid using completely in the tradition to be used for leading-in waste gas to the combustor to follow the return pipe with the flue gas to avoided waste gas to follow the return pipe because the problem of condensation damage, and applied this application low-nitrogen combustion system simple structure of low-nitrogen combustor, need not to arrange external waste gas in and follow the return pipe, overall structure is simple, compact, and occupation space is little, is convenient for arrange, has reduced the holistic manufacturing degree of difficulty of boiler and cost.
Drawings
FIG. 1 is a schematic diagram of a prior art low NOx combustion system;
FIG. 2 is a schematic cross-sectional view of a low-nitrogen combustor of the present invention;
FIG. 3 is an enlarged view in partial cross-section of the low-nitrogen burner of the present invention;
FIG. 4 is a perspective view of the low nitrogen energy efficient combustion system of the present invention;
FIG. 5 is a schematic view, partially in section, of a first perspective of the low nitrogen, energy efficient combustion system of the present invention;
FIG. 6 is a schematic partial cross-sectional view of a second perspective of the low nitrogen energy efficient combustion system of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
Referring to fig. 2 and 3, the present invention provides a low-nitrogen burner, comprising an outer tube 1, an inner tube 2 and a waste gas recycling structure 3, wherein the outer tube 1 is provided with a combustion-supporting gas port 11, the inner tube 2 penetrates into the outer tube 1, the inner tube 2 is provided with a gas port 21 for mixing combustion-supporting gas introduced from the outer tube 1 with gas introduced from the inner tube 2 at a fire outlet end and igniting the mixture, the waste gas recycling structure 3 comprises a waste gas recycling tube cover 31 and a waste gas draft device 32, the waste gas recycling tube cover 31 is sleeved on the outer circumferential wall of the outer tube 1 and is provided with a waste gas recycling hole 311, the waste gas draft device 32 is connected with the waste gas recycling tube cover 31, the waste gas draft device 32 exhausts air, the waste gas which is whirled to the rear of the fire outlet end after burning is sucked into the waste gas recycling tube cover 31 and is conveyed into the fire outlet end of the outer tube 1, the recycled waste gas and the combustion-supporting gas introduced from the outer tube 1, and the, The gas introduced into the inner pipe barrel 2 is mixed and combusted in the fire outlet end.
One end of the outer tube 1 is a fire outlet end, the other end of the outer tube is an air inlet end, the fire outlet end is used for spraying out burning flames, the outer tube has a burning space section 101, a port of the air inlet end is closed and only allows the inner tube 2 to pass through, and the outer peripheral wall of the air inlet end is provided with the combustion-supporting air interface 11 for connecting the combustion-supporting air conveying device 35 to input combustion-supporting air into the outer tube 1.
One end of the inner tube barrel 2 is an air outlet end, the other end is an air inlet end, the inner tube barrel 2 extends into the outer tube barrel 1 through the end wall of the air inlet end of the outer tube barrel 1, the air inlet end is exposed out of the outer tube barrel 1, the gas outlet end of the gas mixing pipe extends to the combustion space section 101 of the outer pipe barrel 1, the port of the gas inlet end of the inner pipe barrel 2 is closed, the gas interface 21 is arranged on the peripheral wall of the gas inlet end, the peripheral wall of the gas outlet end of the inner pipe barrel 2 is connected with a premixing pipe 4, the pipe diameter of the premixing pipe 4 is larger than the outer diameter of the inner pipe barrel 2 and smaller than the inner diameter of the outer pipe barrel 1, an inner end edge is formed at one end of the premixing pipe 4 and fixedly connected with the peripheral wall of the gas outlet end of the inner pipe barrel 2, the outer end edge is formed at the other end and fixedly connected, so that the combustion-supporting gas entering the outer tube 1 partially enters the premixing tube 4, the outer end edge is provided with a gas passing hole 42, so that the combustion-supporting gas entering the outer tube 1 partially enters the combustion space section 101 for combustion. Further, for the air current intensive mixing in combustion space section 101, the intensive combustion, cross gas pocket 42 and adopt spiral pore structure, and a plurality of gas pockets 42 of crossing adopt the same spiral direction, so, the combustion-supporting gas that gets into in combustion space section 101 from gas pocket 42 is the spiral wind, can improve the mixed effect, and the burning is abundant, and the flame outwards scurries farther from combustion space section 101, more is favorable to the furnace heating.
Part of the combustion-supporting gas is premixed with the fuel gas in the premixing pipe 4 and ignited, so that the ignition is not easy to extinguish, and then the combustion enters the combustion space section 101 and is fully mixed and combusted with the other part of the combustion-supporting gas entering the combustion space section 101.
It will be appreciated that an electric spark ignition device (not shown) is disposed within premix tube 4 and may ignite the premix gas within premix tube 4 by an electron splash spark.
It will be appreciated that in order to achieve adequate premixing of the combustion gases and the combustion air entering the pre-mixing tube 4, the end of the inner barrel 2 received within the pre-mixing tube 4 should not be too long, and preferably extends into the adjacent position of the pre-mixing tube 4, in this embodiment the inner barrel 2 extends substantially to the adjacent position of the pre-mixing tube 4 and slightly beyond.
The waste gas suck-back pipe cover 31 is in a pipe barrel shape, is sleeved on the outer peripheral wall of the fire outlet end of the outer pipe barrel 1, and comprises a barrel part and ring plates formed at two ends in the barrel part, wherein the ring plates are fixedly connected on the outer peripheral wall of the outer pipe barrel 1, and the ring plates in the same direction as the fire outlet end are provided with the waste gas suck-back holes 311 for the waste gas to enter the barrel part of the waste gas suck-back pipe cover 31; an air outlet connector is arranged on the peripheral wall of the cylinder part, and the waste gas exhaust device 32 is connected with the air outlet connector so as to guide out the waste gas in the cylinder part and convey the waste gas to the combustion space section in the outer cylinder 1.
The exhaust gas suck-back structure 3 further comprises an exhaust gas return pipe 33, one end of the exhaust gas return pipe 33 penetrates from the closed end of the inner pipe barrel 2, penetrates out of the other end of the inner pipe barrel 2 and then extends to the combustion space section 101, and the other end of the exhaust gas return pipe is connected with the exhaust gas draft device 32 so that the exhaust gas draft device 32 can guide the combusted exhaust gas into the combustion space section 101 in the outer pipe barrel 1.
It will be appreciated that, preferably, to ensure that the premixed gas in the premix tube ignites well and does not extinguish easily after ignition, wastegate 33 passes through premix tube 4 to direct the flue gas into the combustion space section, otherwise wastegate 33 would extend into premix tube 4. Furthermore, a port of the inner tube 2 connected to one end of the pre-mixing tube 4 is provided with a conical wall fixedly connected to the periphery of the exhaust gas return pipe 33, and the conical wall is provided with air holes 22, so that air in the inner tube 2 can enter the pre-mixing tube 4 through the air holes 22.
The exhaust gas back suction structure 3 further comprises a heat exchanger 34, the heat exchanger 34 comprises a heat exchange box body and a heat exchange tube arranged in the box body, a first air inlet interface, a first air outlet interface, a second air inlet interface and a second air outlet interface are arranged on the heat exchange box body, the first air inlet interface is communicated with the heat exchange tube, the first air outlet interface is communicated with the heat exchange tube, so that air entering from the first air inlet interface flows out of the first air outlet interface after flowing through the heat exchange tube, and air entering from the second air inlet interface flows out of the second air outlet interface after flowing through the box body. First air inlet interface connection waste gas resorption pipe cover 31's interface of giving vent to anger, first air-out interface connection waste gas updraft ventilator 32 to waste gas updraft ventilator 32 will follow the waste gas of suction in the waste gas resorption pipe cover 31 and carry through the heat exchanger, realize the heat transfer to waste gas. And, set up heat exchanger 34 before waste gas updraft ventilator 32, reduced the temperature in the waste gas that gets into waste gas updraft ventilator 32 to can protect waste gas updraft ventilator 32 not damaged by high temperature, otherwise the waste gas of high temperature directly gets into waste gas updraft ventilator 32, can damage waste gas updraft ventilator 32 easily, and waste gas updraft ventilator 32's motor burns out easily under the high temperature environment.
The heat transfer can carry out the heat transfer with the external combustion-supporting gas of carrying to combustion-supporting gas interface 11, specifically, a combustion-supporting gas conveyor 35 is connected to the second air inlet interface, and second air-out interface connection is to combustion-supporting gas interface 11, so, can pass through the heat exchanger heat transfer with the higher waste gas of temperature from the combustion-supporting gas of carrying, preheats the combustion-supporting gas of carrying, has fully utilized the heat energy of combustion-supporting gas, plays energy-conserving effect.
In addition, for the convenience of low nitrogen combustor's processing, earlier interior bobbin 2, exhaust gas reflux pipe 33, the end edge at pre-mixing pipe 4 and pre-mixing pipe 4 both ends, wholly process into one whole, then with interior bobbin 2 install to outer bobbin 1 on can, for the convenience of low nitrogen combustor's interior bobbin 2 and the assembly of outer bobbin 1, the first ring flange is formed to the inlet end port periphery of outer bobbin 1, the income gas end periphery wall of interior bobbin 2 forms second ring flange 7, interior bobbin 2 penetrates to in the outer bobbin 1, two ring flanges are connected with aiming at mutually.
In addition, in order to facilitate the installation of the low-nitrogen burner to the boiler body, a flange 5 is formed on the outer periphery of the exhaust-gas-return-pipe cover 31, and the low-nitrogen burner can be easily fixed to the boiler body.
When the low-nitrogen burner is used, please refer to fig. 4 to 6 again, a low-nitrogen energy-saving combustion system includes a furnace body 6 and the low-nitrogen burner installed on the furnace body 6, the furnace body 6 has a hearth, a burner hole 61 is opened on the front side wall of the furnace body 6, the aperture of the burner hole 61 is approximately corresponding to or slightly larger than the outer diameter of the waste gas suck-back pipe cover 31, and the waste gas suck-back pipe cover 31 of the low-nitrogen burner can be sleeved in. The top end of the furnace body 6 is provided with a smoke window 62 adjacent to the rear furnace wall for discharging the waste gas in the combustion furnace. The low-nitrogen burner is arranged on the front furnace wall of the furnace body 6, and the port of the fire outlet end of the outer tube 1 extends into the hearth.
When the low-nitrogen energy-saving combustion system operates, the combustion-supporting gas conveying device 35 is started to convey combustion-supporting gas, a gas device (not shown) conveys gas, the combustion-supporting gas passes through the heat exchanger 34, the gas is conveyed into the outer tube 1 from a combustion-supporting gas interface, the gas is conveyed into the inner tube 2 from a gas interface, then the gas enters the premixing tube 4, part of the combustion-supporting gas enters the premixing tube 4 to be premixed with the gas, the ignition device ignites the premixing gas in the premixing tube 4, flame is introduced into the combustion space section 101, the combustion-supporting gas is further supplemented into the combustion space section 101, the combustion-supporting gas and the premixing gas are fully combusted, the flame is sprayed into the hearth, and the hearth is heated. When the flame is sprayed forwards, the inventor repeatedly observes and researches, and combines repeated experiments, the inventor finds that a large amount of waste gas generated after the forward-sprayed flame is combusted circles around the periphery of the fire outlet end of the outer pipe barrel 1, a part of the waste gas is discharged to the smoke window 62, the waste gas exhaust device 32 is started, the waste gas accumulated on the periphery of the fire outlet end of the outer pipe barrel 1 enters the waste gas return suction pipe cover 31, then passes through the heat exchanger 34 and then enters the waste gas return pipe 33 to be discharged into the combustion space section 101 to be mixed and combusted with the fuel gas and the combustion-supporting gas in the combustion space section 101, and because the oxygen content in the waste gas is low, the density of oxygen in the combustion-supporting gas can be diluted, the combustion temperature in the combustion space section 101 is reduced, the generation amount of nitrogen oxides.
By adopting the low-nitrogen combustor, a large amount of exhaust gas can be circularly introduced into the combustion space section 101 to be mixed with the combustion-supporting gas and the fuel gas, the combustion temperature is maintained below the temperature at which a large amount of nitrogen oxides are generated for a long period of time, and when the combustion temperature rises and the amount of nitrogen oxides generated is large, the concentration of nitrogen oxides in the exhaust gas is also high, and the amount of nitrogen oxides circularly introduced into the combustion space section is also large, thereby lowering the combustion temperature.
Compared with the traditional low-nitrogen combustion device, the low-nitrogen combustor has the advantages that the waste gas resorption structure 3 is arranged at the fire outlet end, can fully absorb and recycle the convoluted waste gas, meet the requirement of reducing the combustion temperature, meet the control on the generation amount of nitrogen oxides, fully break through the traditional thought that the waste gas is concentrated and collected at the smoke outlet and cannot return to the vicinity of the fire outlet end, because the smoke exhaust port is far away from the fire outlet end, otherwise the smoke exhaust port can directly exhaust the combustion heat, the application learns that the combustion waste gas part can be convoluted to the vicinity of the fire outlet end (namely the periphery of the outer tube), so, design the aforesaid and set up waste gas resorption structure 3 in the end periphery of going out a fire, the waste gas in the resorption furnace can reach the formation volume that restraines nitrogen oxide equally, and satisfies the required temperature effect of furnace. Compare in prior art, can avoid using completely in the tradition to be used for leading-in waste gas to the combustor to follow the return pipe with the flue gas to avoided waste gas to follow the return pipe because the problem of condensation damage, and applied this application low-nitrogen combustion system simple structure of low-nitrogen combustor, need not to arrange external waste gas in and follow the return pipe, overall structure is simple, compact, and occupation space is little, is convenient for arrange, has reduced the holistic manufacturing degree of difficulty of boiler and cost.
In addition, this application can preheat the combustion-supporting gas that the external world sent into through setting up the heat exchanger, sends into to preheat intraductal combustion-supporting gas and changes after preheating and light in, and simultaneously, waste gas self has reduced the temperature for it is lower relatively to get into the waste gas temperature in the combustion space section, is favorable to reducing the temperature of burning. Compare in the tradition, the waste gas of traditional low nitrogen combustor directly gets into out the end of a fire burning and then discharges into furnace, and most follow the smoke window is discharged again, and the heat of exhaust gas is not fully utilized, the low nitrogen combustor make full use of the heat of exhaust gas of this application, and is more energy-conserving to, the journey that the waste gas of this application passed through can fully shorten, need not to follow the long distance route of stove tail to furnace end, can avoid the thermal loss of exhaust gas.
It can be understood that in the application, the combustion-supporting gas is not limited to air, but also can be other combustion-supporting media, and the fuel gas is not limited to natural gas, but can be other fuel media, even fuel oil and the like.
It can be understood that the low-nitrogen energy-saving combustion system comprises a control box 8, and the control box 8 is arranged outside the boiler and used for starting and adjusting the rotating speed of the combustion-supporting gas conveying device and the rotating speed of the fuel gas conveying device, so that the conveying amount of the combustion-supporting gas and the fuel gas is controlled.
The combustion method of the low-nitrogen combustion system comprises the following steps of:
the combustion-supporting gas conveying device 35, the gas conveying device and the waste gas exhaust device 32 are started, gas is filled into the inner tube barrel 2 through the gas interface 21, combustion-supporting gas is filled into the outer tube barrel 1 through the combustion-supporting gas interface, the gas and the combustion-supporting gas are premixed, premixed gas is ignited, flame generated by combustion is sprayed into a furnace 6 hearth from a fire outlet end, waste gas backflow which is opposite to the flame spraying direction and is formed after the flame is combusted is formed in the hearth, the waste gas backflow is sucked into the waste gas suck-back tube cover 31 through the waste gas exhaust device 32 and is conveyed to the waste gas backflow pipe 33 and flows back into the combustion space section 101 of the fire outlet end of the outer tube barrel 1.
When the heat exchanger 34 is installed, the combustion-supporting gas conveying device 35 conveys combustion-supporting gas to enter the outer tube 1 after passing through the heat exchanger 34, waste gas enters the waste gas return pipe 33 after passing through the waste gas return suction pipe cover 31, and heat exchange between the combustion-supporting gas and the waste gas is realized.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A low-nitrogen burner comprises an outer tube (1) and an inner tube (2), one end of the outer tube (1) is a fire outlet end, the other end of the outer tube is an air inlet end, the air inlet end is provided with a combustion-supporting air interface (11), the inner tube (2) penetrates into the outer tube (1), the inner tube (2) is provided with a gas interface (21) for mixing combustion-supporting air led in by the outer tube (1) and gas led in by the inner tube (2) in the fire outlet end of the outer tube (1) and igniting and burning the mixed air, the low-nitrogen burner is characterized by comprising a waste gas resorption structure (3), the waste gas resorption structure (3) comprises a waste gas resorption tube cover (31) and a waste gas exhaust device (32), the waste gas resorption tube cover (31) is arranged on the outer peripheral wall of the fire outlet end of the outer tube (1) and is provided with a waste gas resorption hole (311), the waste gas exhaust device (32) is connected with the waste gas resorption tube cover, exhaust gas exhaust device (32) bleeds, and the waste gas that circles round to a fire outlet end rear after will burning inhales behind waste gas resorption pipe cover (31) and conveys to outer tube (1) in the fire outlet end, and the waste gas that conveys back mixes with the leading-in combustion-supporting gas of outer tube (1), the leading-in gas of inner tube (2), burns in the fire outlet end.
2. The low-nitrogen burner as claimed in claim 1, wherein the flue gas recirculation structure (3) comprises a flue gas recirculation pipe (33), the flue gas recirculation pipe (33) penetrates into the inner tube (2), and the flue gas draft device (32) is connected to the flue gas recirculation tube cover (31) at one end and the flue gas recirculation pipe (33) at the other end through a pipe.
3. The low-nitrogen burner according to claim 2, wherein the flame-out end has a combustion space section (101), the inner tube (2) has a gas-out end, a premix tube (4) is connected to the outer peripheral wall of the gas-out end, and the other end of the premix tube (4) extends to the combustion space section (101).
4. A low-nitrogen burner according to claim 3, characterized in that the outlet end of the inner tube (2) extends to a position adjacent to the premix tube (4) and the flue gas return pipe (33) extends to a position adjacent to the combustion space section (101).
5. The low-nitrogen burner according to claim 3, wherein an inner end edge is formed at one end of the premixing tube (4) and fixedly connected with an outer peripheral wall of an air outlet end of the inner tube (2), an outer end edge is formed at the other end of the premixing tube and fixedly connected with an inner peripheral wall of the outer tube (1), a vent hole (41) is formed at the inner end edge so that part of combustion-supporting air entering the outer tube (1) enters the premixing tube (4), and a vent hole (12) is formed at the outer end edge so that part of combustion-supporting air entering the outer tube (1) enters the combustion space section (101) to be combusted.
6. The low-nitrogen burner according to claim 5, wherein the gas passing holes (12) adopt a spiral hole structure.
7. The low-nitrogen burner according to claim 6, wherein the exhaust gas recirculation structure (3) further comprises a heat exchanger (34), the heat exchanger (34) is provided with a first air inlet and a first air outlet, a second air inlet and a second air outlet, the first air inlet is connected with the air outlet of the exhaust gas recirculation pipe cover (31), the first air outlet is connected with the exhaust gas draft device (32), an oxidant gas conveying device (35) is connected to the second air inlet, and the second air outlet is connected to the oxidant gas inlet (11).
8. The utility model provides a low nitrogen combustion system, includes furnace body (6) and installs the low nitrogen combustor on furnace body (6), furnace body (6) have furnace, have seted up burner hole (61) on the front side oven of furnace body, and the top of furnace body is close to the rear side oven wall and is provided with smoke window (62) to supply the exhaust combustion exhaust gas in the furnace, its characterized in that: the low-nitrogen burner is the low-nitrogen burner in any one of claims 1 to 7, and is installed on the front side wall of the furnace body (6), and the port of the fire outlet end of the outer tube (1) extends into the hearth.
9. A combustion method using the low-nitrogen combustion system of claim 8, comprising the steps of:
starting the combustion-supporting gas conveying device (35), the fuel gas conveying device and the waste gas exhaust device (32), filling fuel gas into the inner tube barrel (2) through the fuel gas interface (21), and filling combustion-supporting gas into the outer tube barrel (1) through the combustion-supporting gas interface;
Premixing fuel gas and combustion-supporting gas, igniting the premixed gas, and fully combusting in a combustion space section (101) at a fire outlet end;
flame generated by combustion is sprayed into a hearth of the furnace body (6) from a fire outlet end, waste gas backflow which is opposite to the flame spraying direction and is formed after the flame is combusted is formed in the hearth, and the waste gas backflow is sucked into a waste gas backflow suction pipe cover (31) of the fire outlet end of the outer pipe barrel (1) through a waste gas exhaust device (32), conveyed into a waste gas backflow pipe (33) and flows back into a combustion space section (101) of the fire outlet end of the outer pipe barrel (1).
10. A method of combusting the low-nitrogen combustion system of claim 9, comprising the steps of: when the low-nitrogen combustion system is provided with the heat exchanger (34), the combustion-supporting gas conveying device conveys combustion-supporting gas to enter the outer tube barrel (1) after passing through the heat exchanger, waste gas enters the waste gas return pipe (33) after passing through the waste gas return pipe cover (31), and the combustion-supporting gas and the waste gas realize heat exchange.
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| CN201910435490.0A CN111981478A (en) | 2019-05-23 | 2019-05-23 | Low-nitrogen combustor, low-nitrogen combustion system and combustion method thereof |
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| CN115585458A (en) * | 2022-11-29 | 2023-01-10 | 佛山市德力泰科技有限公司 | High-speed preheating premixing combustion device |
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