CN116857642A - Multi-gas-type mixed combustion gas burner - Google Patents
Multi-gas-type mixed combustion gas burner Download PDFInfo
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- CN116857642A CN116857642A CN202310656781.9A CN202310656781A CN116857642A CN 116857642 A CN116857642 A CN 116857642A CN 202310656781 A CN202310656781 A CN 202310656781A CN 116857642 A CN116857642 A CN 116857642A
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- 239000000567 combustion gas Substances 0.000 title claims description 13
- 239000007789 gas Substances 0.000 claims abstract description 119
- 239000007921 spray Substances 0.000 claims abstract description 76
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 73
- 238000002156 mixing Methods 0.000 abstract description 14
- 238000005192 partition Methods 0.000 abstract description 5
- 239000002737 fuel gas Substances 0.000 description 45
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 43
- 239000000446 fuel Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 12
- 238000009826 distribution Methods 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 230000006872 improvement Effects 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
- F23D14/24—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion
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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
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
-
- 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
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
-
- 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
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- 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
- F23D14/70—Baffles or like flow-disturbing devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a flame lighter, which comprises a flame lighter, a central tube, an inner secondary air channel and an outer secondary air channel; the outer secondary air channel comprises an outer secondary air inlet pipe and an outer volute which are connected; the inner secondary air channel comprises an inner secondary air inlet pipe and an inner horizontal pipe which are connected; a low-heat-value gas spray pipe is arranged between the outer volute and the inner horizontal pipe, the low-heat-value gas spray pipe is connected with a low-heat-value gas inlet pipe, and swirl vanes are arranged in the low-heat-value gas spray pipe; a flame holder is arranged in the front end of the inner horizontal tube and fixedly connected with the central tube, a plurality of gas spray guns which are more than two concentric and annular are arranged in the inner horizontal tube at the radial outer side of the flame holder, and the head part of each gas spray gun is provided with a plurality of small holes; the gas spray guns on different rings are connected with respective gas inlet pipes. The invention can realize the mixed combustion of multiple gases and gases in any proportion, ensure the good mixing of the gases and the air, realize reasonable combustion partition, and realize low NOx emission while maintaining stable combustion process and high burnout rate.
Description
Technical Field
The invention relates to a gas burner, in particular to a gas burner for multi-gas mixed combustion of a boiler.
Background
The gas burner is a device for mixing and burning gas and air in a certain proportion, and is mainly composed of ignition gun, secondary air duct, air distributor, flame holder and other parts. Nitrogen oxides (NOx) are known to be one of the main pollutants causing atmospheric pollution, and can bring about environmental problems such as acid rain, photochemical smog and the like, and seriously endanger human health. Therefore, strict nitrogen oxide emission standards are set out, and the nitrogen oxide emission concentration after combustion is generally limited to about 50mg/m3, which presents great challenges for industrial production. In such a context, the demand for low NOx emissions gas burners is showing an increasing trend.
In reality, the industrial field has the characteristics of multiple gas types, large heat value and property difference, such as natural gas, blast furnace gas, coke oven gas, chemical tail gas and the like, the existing gas burner has multiple types, and has own structure and technical characteristics, and the common low NOx combustion technology comprises: the fuel classification technology, the air classification technology, the cyclone combustion technology and the like have the defects of the technology, such as unstable combustion, reduced thermal efficiency and the like, which are caused by the classification combustion technology and the cyclone combustion technology, so that the single low-NOx combustion technology is difficult to meet the actual production requirement, and the fuel with large difference of heat value characteristics is integrated into a single burner, so that the effective matching of each fuel and the combustion chamber is difficult to ensure, and the problems of narrow fuel mixing proportion range, uneven fuel mixing, difficulty in realizing stable and efficient mixed combustion of multiple fuel types of fuel, lower burnout rate, higher NOx emission and the like exist, and cannot be applied to a high-power burner boiler.
Therefore, the combustion and emission characteristics of various fuels must be comprehensively considered, and various low-NOx combustion technologies are utilized to carry out integrated innovation aiming at the combustion nozzle, air distribution, timely mixing and controllable combustion of the burner.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a multi-gas mixed combustion gas burner which can realize mixed combustion of multiple gases and gases in any proportion, ensure good mixing of the gases and air, realize reasonable combustion partition, maintain stable combustion process and high burnout rate, and realize low NOx emission.
In order to achieve the aim, the multi-gas mixed combustion gas burner comprises a burning torch, a central tube, an inner secondary air channel and an outer secondary air channel; the method is characterized in that: the outer secondary air channel comprises an outer secondary air inlet pipe and an outer volute which are communicated with each other; the inner secondary air channel comprises an inner secondary air inlet pipe and an inner horizontal pipe which are communicated with each other; a low-heat-value gas spray pipe is arranged between the outer volute and the inner horizontal pipe, the low-heat-value gas spray pipe is connected with a low-heat-value gas inlet pipe, and swirl vanes are arranged in the low-heat-value gas spray pipe; the flame stabilizer is arranged in the front end of the inner horizontal pipe and fixedly connected with the central pipe, a plurality of gas spray guns are arranged in the inner horizontal pipe at the radial outer side of the flame stabilizer, the plurality of gas spray guns are in more than two concentric annular arrangements, and the head part of each gas spray gun is provided with a plurality of small holes; the gas spray guns on different rings are connected with respective gas inlet pipes.
When the burner is used, different types of fuel gas are fed into the burner through spray guns on different rings and nozzles of the low-heat-value fuel gas spray pipe, the spray guns spray high-heat-value fuel gas such as natural gas and coke oven gas, the low-heat-value fuel gas such as blast furnace gas is sprayed through the low-heat-value fuel gas spray pipe, and various fuel gases are independently fed into and independently combusted, so that the mixed combustion of various fuel gases in any proportion can be realized by adjusting the flow of each fuel gas, and the mixed combustion mode can be flexibly adjusted; the multiple fuel gases and the air are introduced along the respective flow passages, so that the mixing and combustion of the fuel gases and the air are effectively enhanced under the action of the swirl vanes and the flame stabilizer, the rapid generation of a large amount of NOx caused by uneven mixing at the initial stage of combustion is avoided, and the combustion partition is realized; each level of fuel spray gun forms an annular arrangement mode, multiple layers of annular flames can be formed when different fuel gases are mixed for burning, so that the fuel gases are dispersed uniformly as much as possible, the fuel gases and combustion-supporting air are mixed for burning rapidly to form a layered circumferential uniform burning flame, the fuel gases are burnt completely and heat is prevented from being concentrated to form a burning field with larger temperature deviation distribution, the head of each fuel spray gun is sprayed by a plurality of small holes, the fuel air flow is mixed with air to form a small flame burning mode, the small flames of each gun are evenly divided, the occurrence of temperature peaks and temperature valleys is inhibited, and the generation of a high-temperature area is avoided while the independent flames are formed, the fuel gas mixed burning mode is adjustable, the whole burning process is more sufficient, and the burnout rate is improved, so that the generation of thermal NOx can be reduced;
as a further improvement of the invention, at least a plurality of gas spray guns on the same ring are divided into more than two groups, the gas spray guns of different groups are staggered in the ring direction, and a plurality of gas spray guns of the same group are connected with the same air inlet pipe; the mixed combustion of more kinds of fuel gas can be realized, the independent air inlet is realized, annular mixed combustion flame is formed, and uniform combustion flame is formed in the circumferential direction, so that the generation of a high temperature area is avoided;
as a further improvement of the invention, the plurality of gas spray guns in the same group are connected with the same gas inlet pipe through an annular distributing pipe; the gas distribution and the replacement of the spray gun of different types of fuel gas are convenient;
as a further improvement of the invention, the low heat value gas spray pipe comprises a small diameter pipe, a conical pipe and a large diameter pipe which are sequentially connected from front to back, the swirl blades are arranged in the small diameter pipe, and the low heat value gas inlet pipe is connected with the large diameter pipe; the large-diameter pipe can meet the requirement of arranging an air inlet pipe at the tail part, meanwhile, the flow rate of low-heat-value fuel gas is reduced, the requirement of lower resistance is met, the small-diameter pipe can ensure the injection flow rate of the fuel gas, and the air flow and the higher flow rate generate higher rotational flow strength through the rotational flow blades; the conical tube ensures that no significant local resistance is generated when the airflow passes through; because the low-heat-value gas is rotary jet flow, the small-diameter pipe adopts a straight-through nozzle, so that the low-heat-value gas is convenient to cooperate with the high-heat-value gas flame on the inner side to ensure stable and efficient combustion of the heat-value gas flow;
as a further improvement of the invention, an adjustable tangential blade is arranged in the outer volute, and the front end of the outer volute is connected with a shrinkage-shaped nozzle; the air quantity can be adjusted, and the air speed can be improved;
as a further improvement of the invention, the axis of the low-heat value gas spray pipe is vertical to the plane of the outer volute; the mixing effect of air and low-calorific-value fuel gas can be improved;
as a further improvement of the invention, the outer overgrate air inlet pipe and the inner overgrate air inlet pipe are respectively internally provided with an adjusting baffle plate; the air quantity of the outer secondary air and the air quantity of the inner secondary air can be respectively regulated, so that air classification and combustion classification can be accurately realized, and further the emission of NOx is reduced;
as a further improvement of the invention, the low-heating value fuel gas inlet pipe is positioned on the tangential direction of the large-diameter pipe; the swirling degree of the low-calorific-value gas flow can be improved, and the flame stability and burnout rate are improved during high-proportion combustion;
in conclusion, the invention can realize the mixed combustion of multiple gases and gases in any proportion, ensure the good mixing of the gases and the air, realize reasonable combustion partition, and realize low NOx emission while maintaining stable combustion process and high burnout rate.
Drawings
Fig. 1 is a perspective view of an embodiment of the present invention.
Fig. 2 is a cross-sectional view of an embodiment of the present invention.
FIG. 3 is a front view of the burner port end face of FIG. 1.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1 to 3, a multi-gas-species mixed combustion gas burner of this embodiment includes a burning torch 1, a center tube 2, an inner secondary air duct, an outer secondary air duct; the outer secondary air channel comprises an outer secondary air inlet pipe 6 and an outer volute 4 which are communicated, and a shrinkage-shaped nozzle 5 connected to the front end of the outer volute 4, an adjusting baffle 7 is arranged in the outer secondary air inlet pipe 6, and an adjustable tangential blade 41 is arranged in the outer volute 4; the inner secondary air channel comprises an inner secondary air inlet pipe 10 and an inner horizontal pipe 8 which are communicated, and an adjusting baffle 11 is arranged in the inner secondary air inlet pipe 10; a low-heat-value gas spray pipe 3 is arranged between the outer volute 4 and the inner horizontal pipe 8, the axis of the low-heat-value gas spray pipe 3 is perpendicular to the plane of the outer volute 4, the low-heat-value gas spray pipe 3 comprises a small-diameter pipe 31, a conical pipe 32 and a large-diameter pipe 33 which are sequentially connected from front to back, swirl vanes 34 are arranged in the small-diameter pipe 31, a low-heat-value gas inlet pipe 35 is connected to the large-diameter pipe 33, the low-heat-value gas inlet pipe 35 is positioned in the tangential direction of the large-diameter pipe 33, and a low-heat-value gas spray nozzle of a cavity is arranged at the front end of the small-diameter pipe 31; the flame holder 12 is arranged in the front end of the inner horizontal pipe 8 and fixedly connected with the central pipe 2, a plurality of gas spray guns 13, 14, 15 and 16 corresponding to different gases are arranged in the inner horizontal pipe 8 on the radial outer side of the flame holder 12, the plurality of gas spray guns 13 to 16 are arranged in two concentric rings, the plurality of gas spray guns 13, 14 or 15 and 16 on the same ring are divided into two groups, the gas spray guns 13 and 14 of different groups are arranged in a staggered manner in the circumferential direction, the gas spray guns 15 and 16 are also arranged in a staggered manner in the circumferential direction, the plurality of gas spray guns 13 of the same group are connected with the gas inlet pipe 18 through the annular distribution pipe 17, the plurality of gas spray guns 14 or 15 or 16 of the same group are connected with the respective gas inlet pipe 19 or 20 or 21 through the respective annular distribution pipe, and the heads of the gas spray guns 13 to 16 are provided with a plurality of small holes;
the ignition gun 1 of the embodiment is arranged in the central tube 2, and the central tube 2 can also be used as a fire detection or fire observation hole channel; the flame holder 12 is welded on the central tube 2, and can partially cover the inner secondary air to generate rotational flow, the coverage degree is expressed by the ratio of the projection area of the end face of the inner secondary air outlet of the flame holder 12 to the circular area formed by the inner wall of the inner secondary air channel, the coverage degree ratio is usually 20% -60% according to the change of the fuel gas components, the rotational flow of the inner secondary air is favorable for promoting the mixing of fuel gas and secondary air, and favorable for the backflow of flue gas and stabilizing combustion flame;
when the invention is used, different types of fuel gas are fed into a hearth through different fuel gas spray guns 13-16 and the spray openings of the outer horizontal pipe 3, low-heat-value Blast Furnace Gas (BFG) is sprayed from the low-heat-value fuel gas spray openings at the front end of the small-diameter pipe 31, high-heat-value and higher-heat-value Natural Gas (NG), partial oxidation gas (POX), coke Oven Gas (COG) and carbon four gas (C4) are respectively sprayed from the fuel gas spray guns 13, 14, 15 and 16, the proper quantity of each type of fuel gas spray guns are annularly arranged and sprayed into the hearth with different flow rates, the small hole sizes and the hole numbers of the different fuel gas spray guns are also different, and the small hole numbers are determined based on the limit fuel gas pressure of the maximum load of each fuel gas; the multiple gases are independently fed and independently combusted, and the flow rate of each gas can be regulated through the regulating valve on each air inlet pipe, so that the mixed combustion of the multiple gases in any proportion can be realized, and the mixed combustion mode can be flexibly regulated; multiple fuel gases and air are introduced along the flow passages, and different air injection positions are arranged in the circumferential direction through the inner horizontal pipe 8, the outer volute 4 and the shrinkage-shaped nozzle 5, so that the fuel gases and the air can be uniformly injected into a hearth, the air classification is realized, the mixing and the combustion of the fuel gases and the air are effectively enhanced under the actions of the swirl vanes 34 and the flame stabilizer 12, the rapid NOx mass generation caused by uneven mixing at the initial stage of combustion is avoided, and the combustion partition is realized; the gas spray guns 13-16 form an annular arrangement mode, multiple layers of annular flames can be formed when different gas is mixed for combustion, so that the gas is dispersed uniformly as much as possible, the gas and the secondary air for supporting combustion are quickly mixed for combustion, a layered circumferential uniform combustion flame is formed, the gas is completely combusted, heat is prevented from being concentrated to form a combustion field with larger temperature deviation distribution, the heads of the gas spray guns are sprayed by a plurality of small holes, the gas flow is mixed with air to form a small flame combustion mode, the spray small flames of the guns are uniformly divided, the occurrence of temperature peaks and temperature valleys is restrained, independent flames are formed, the gas mixed combustion mode is adjustable, the whole combustion process is more complete, the burnout rate is improved, the generation of a high-temperature area is avoided, and the generation of thermal NOx can be reduced;
the heat value of the blast furnace gas is low, the combustion characteristic is poor, the air flow is high, the cavity is utilized to realize homogenization of air intake, the large-diameter pipe 33 can meet the requirement of arranging the air inlet pipe 35 at the tail part, and meanwhile, the flow rate of the low heat value gas is reduced, so that the requirement of lower resistance is met; the small-diameter pipe 31 adopts a straight-through nozzle, the small-diameter pipe 31 can ensure the jet flow rate of the fuel gas, the air flow and the higher flow rate generate higher rotational flow strength through the rotational flow blades 34, the mixing of the blast furnace gas and the combustion air is enhanced, and the jet flow is rotated through the annular nozzle, so that the stable and efficient combustion of the blast furnace gas and the combustion air is facilitated by the cooperation of the inner high-heat-value fuel gas flame and the low-heat-value air flow; the conical tube 32 ensures that no significant local resistance is created when the air flow passes through it;
the outer secondary air inlet pipe 6 and the inner secondary air inlet pipe 10 are respectively provided with an adjusting baffle 7 or 11, so that the air quantity of the outer secondary air and the air quantity of the inner secondary air can be respectively adjusted, the air classification and the combustion classification can be accurately realized, the inner secondary air outlet adopts a straight channel structure, and the outer secondary air outlet adopts a contracted nozzle 5 so as to meet the air speed requirement; the annular distribution pipe 17 is used for facilitating the distribution and the replacement of the spray gun of different types of fuel gas;
the invention is used for various fuel gases with large heat value component difference, each fuel gas spray gun 13-16 is reasonably arranged and matched with the secondary air of combustion supporting in an optimized way, can realize ultralow nitrogen emission and high-efficiency combustion of various fuel gases, and specifically analyzes the following steps:
(1) Staged combustion: a central tube 2, an inner horizontal tube 8, a flame stabilizer 12 therein, two annularly arranged gas spray guns 13-16, a low-calorific-value gas spray 3, an outer volute 4 and a contracted nozzle 5 are concentrically arranged in sequence from inside to outside, and air and gas required by combustion are supplied in a grading manner; specifically, through the adjusting baffle 7 and the adjusting baffle 11, the inner secondary air quantity and the outer secondary air quantity can be adjusted in any proportion, so that the staged combustion of the combustion air is realized; the gas spray guns 13-16 at all levels are reasonably arranged, three layers of spray guns 15, 16 for COG and C4, spray guns 13, 14 for NG and POX and blast furnace gas spray orifices are arranged from inside to outside, and meanwhile, the spray guns 13, 14 are staggered in the same circumference, and the spray guns 15, 16 are staggered, so that fuel staged combustion of gas in the radial direction and the circumferential direction of the burner spray orifices is realized; the head of each gas spray gun is sprayed by a plurality of small holes, the gas flow is mixed with air to form a small flame combustion mode, the spray small flames of each gun are uniformly divided to form uniform combustion flames in the circumferential direction, the generation of a high temperature area is avoided, and the generation of thermal NOx can be reduced;
(2) And (3) uniform temperature combustion: each gas spray gun forms an annular arrangement mode, namely, spray holes with proper number and size are arranged along a 360-degree area to organize and burn, and multiple layers of annular flames can be formed when different gas is mixed for burning; the structure can lead the fuel gas to be dispersed uniformly as much as possible, lead the fuel gas to be quickly mixed and combusted with the combustion-supporting air to form a layered circumferential uniform combustion flame, lead the fuel gas to be combusted completely and prevent heat from being concentrated to form a combustion field with larger temperature deviation distribution, inhibit the occurrence of temperature peaks and temperature valleys, and further improve the burnout rate of fuel gas components such as CO and inhibit the generation of NOx.
(3) Flue gas reflux: the flame holder 12 is arranged in the inner horizontal pipe 8, secondary air flows through the flame holder 12 to form a flow field structure of a central backflow area, the backflow area structure can play a role in stabilizing combustion of initial flame of fuel gas, and meanwhile, the backflow area can retain high-temperature low-oxygen smoke generated by combustion to form a high-temperature low-oxygen backflow smoke area, so that combustion products, unreacted air and fuel are preheated, enhanced to burn and stabilize flame; the outer secondary air is arranged on the outermost layer, and is regulated by tangential blades 41 to form a flow field structure of a backflow area of the outer secondary air, so that surrounding smoke is sucked and mixed into combustion air, a proper rotational flow backflow area structure is formed by regulating a proper blade angle, the oxygen concentration of diluted air is ensured to be at an optimal level, and the formation of thermal NOx is inhibited; the flue gas reflux ensures that the temperature distribution in the furnace is more uniform, the highest combustion temperature is reduced, the high temperature area is reduced, and the formation of instantaneous NOx and thermal NOx is inhibited;
in summary, the invention comprehensively utilizes the air classification technology, the fuel classification technology, the swirl combustion technology and the like, can realize low NOx emission while maintaining stable combustion process, adjustable fuel mixed combustion mode and high burnout rate, and can be applied to a boiler adopting a 35 MWth-class high-power burner.
The present invention has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the invention to the embodiments described.
Claims (8)
1. A multi-gas mixed combustion gas burner comprises a burning torch, a central tube, an inner secondary air channel and an outer secondary air channel; the method is characterized in that: the outer secondary air channel comprises an outer secondary air inlet pipe and an outer volute which are communicated with each other; the inner secondary air channel comprises an inner secondary air inlet pipe and an inner horizontal pipe which are communicated with each other; a low-heat-value gas spray pipe is arranged between the outer volute and the inner horizontal pipe, the low-heat-value gas spray pipe is connected with a low-heat-value gas inlet pipe, and swirl vanes are arranged in the low-heat-value gas spray pipe; the flame stabilizer is arranged in the front end of the inner horizontal pipe and fixedly connected with the central pipe, a plurality of gas spray guns are arranged in the inner horizontal pipe at the radial outer side of the flame stabilizer, the plurality of gas spray guns are in more than two concentric annular arrangements, and the head part of each gas spray gun is provided with a plurality of small holes; the gas spray guns on different rings are connected with respective gas inlet pipes.
2. A multi-gas-species mixed combustion gas burner as set forth in claim 1, wherein: at least the same annular gas spray guns are divided into more than two groups, the gas spray guns of different groups are staggered in the annular direction, and the gas spray guns of the same group are connected with the same air inlet pipe.
3. A multi-gas-species mixed combustion gas burner as set forth in claim 2, wherein: the plurality of gas spray guns in the same group are connected with the same gas inlet pipe through an annular distributing pipe.
4. A multi-gas-species mixed combustion gas burner as claimed in any one of claims 1 to 3, wherein: the low-heat-value gas spray pipe comprises a small-diameter pipe, a conical pipe and a large-diameter pipe which are sequentially connected from front to back, the swirl vanes are arranged in the small-diameter pipe, and the low-heat-value gas inlet pipe is connected to the large-diameter pipe.
5. A multi-gas-species mixed combustion gas burner as set forth in claim 4, wherein: tangential blades are arranged in the outer volute, and a contractive nozzle is connected with the front end of the outer volute.
6. A multi-gas-species mixed combustion gas burner as set forth in claim 5, wherein: the axis of the low-heating value gas spray pipe is perpendicular to the plane of the outer volute.
7. A multi-gas-species mixed combustion gas burner as set forth in claim 6, wherein: and adjusting baffles are arranged in the outer overgrate air inlet pipe and the inner overgrate air inlet pipe.
8. A multi-gas-species mixed combustion gas burner as set forth in claim 4, wherein: the low-heating value gas inlet pipe is positioned on the tangential direction of the large-diameter pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310656781.9A CN116857642A (en) | 2023-06-05 | 2023-06-05 | Multi-gas-type mixed combustion gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310656781.9A CN116857642A (en) | 2023-06-05 | 2023-06-05 | Multi-gas-type mixed combustion gas burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116857642A true CN116857642A (en) | 2023-10-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310656781.9A Pending CN116857642A (en) | 2023-06-05 | 2023-06-05 | Multi-gas-type mixed combustion gas burner |
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| Country | Link |
|---|---|
| CN (1) | CN116857642A (en) |
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2023
- 2023-06-05 CN CN202310656781.9A patent/CN116857642A/en active Pending
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