CN110848681A - Large-load ultralow-nitrogen combustor suitable for low-heat-value and low-pressure fuel gas - Google Patents
Large-load ultralow-nitrogen combustor suitable for low-heat-value and low-pressure fuel gas Download PDFInfo
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- CN110848681A CN110848681A CN201911064452.5A CN201911064452A CN110848681A CN 110848681 A CN110848681 A CN 110848681A CN 201911064452 A CN201911064452 A CN 201911064452A CN 110848681 A CN110848681 A CN 110848681A
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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
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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
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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
- F23D14/62—Mixing devices; Mixing tubes
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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
- F23D14/70—Baffles or like flow-disturbing devices
Abstract
The invention discloses a large-load ultralow-nitrogen burner suitable for low-heat-value and low-pressure fuel gas, which comprises a cylinder body, wherein a fire pan brick fixing sleeve is arranged on the cylinder body and fixedly connected with a fire pan brick, an inner fuel gas gun and an outer fuel gas gun are respectively arranged on the inner side and the outer side of the fire pan brick, the center of the bottom of the cylinder body is connected with a flue gas backflow mechanism, a stable ignition device penetrates through the flue gas backflow mechanism, and the cylinder body is respectively connected with an air inlet system and a fuel gas inlet system through flanges; the fire pan brick is of a hollow structure, and the outer wall of the fire pan brick is provided with steps and inclined planes. The combustor adopts a noise elimination structure and a low heat conduction design, and has excellent heat insulation performanceIn addition, the outward heat dissipation loss of the burner box body is reduced to the minimum, thereby achieving the purposes of high efficiency, energy conservation, stable combustion and low NOXLow CO emission and low noise.
Description
Technical Field
The invention relates to the technical field of industrial boiler burners, in particular to a large-load ultralow-nitrogen burner suitable for low-heat-value and low-pressure fuel gas.
Background
At present, most of petrochemical boilers, metallurgical industrial boilers, industrial steam boilers and power plant and power station boiler combustors are old oil-gas mixed combustion combustors, fuel gas is high-pressure and high-heat natural gas, catalytic dry gas and self-produced dry gas, and smoke emission seriously exceeds the standard; more importantly, the combustor for burning low-pressure and low-heat value fuel gas of a large-load boiler is still blank at home, the 2015-07-01 regulation of pollutants for refining and manufacturing industry (GB 31570-2015) published by the national environmental protection bureau is implemented at present, and higher requirements are put on the smoke emission, so that the development of the combustor for the large-load boiler with low NOx and low CO emission suitable for low-heat value and low-pressure fuel gas is urgent.
Disclosure of Invention
In view of the above technical problems in the related art, the present invention provides a high load ultra-low nitrogen burner suitable for low heating value, low pressure fuel gas, which can overcome the above disadvantages of the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a large-load ultralow-nitrogen burner suitable for low-heat-value and low-pressure fuel gas comprises a barrel, wherein a fire pan brick fixing sleeve is arranged on the barrel and fixedly connected with a fire pan brick, and the large-load ultralow-nitrogen burner is characterized in that an inner fuel gas gun and an outer fuel gas gun are respectively arranged on the inner side and the outer side of the fire pan brick, the center of the bottom of the barrel is connected with a flue gas backflow mechanism, a stable ignition device penetrates through the flue gas backflow mechanism, and the barrel is respectively connected with an air inlet system and a fuel gas inlet system through flanges;
the fire pan brick is of a hollow structure, and the outer wall of the fire pan brick is provided with steps and inclined planes.
Further, a swirler is installed in the cylinder; the inner gas gun and the outer gas gun both comprise gun barrels, and swirlers are mounted inside the front ends of the gun barrels.
Further, the stable ignition device comprises an ignition device outer cylinder, an ignition gun tube is arranged in the ignition device outer cylinder, an ignition gun air inlet is formed in the outer side of the lower portion of the ignition device outer cylinder, a flange is arranged at the bottom end of the ignition device outer cylinder, and the flange is connected with the fixing plate; and a swirler is arranged in the front end of the ignition gun tube.
Furthermore, the swirler includes the spinning disk, spinning disk central authorities are equipped with the whirl inner circle, the spinning disk outside is equipped with the whirl outer lane.
Furthermore, the barrel comprises an inner barrel and an outer barrel, aluminum silicate fiber cotton is filled between the outer barrel and the inner barrel, a bottom plate is arranged at the bottom of the inner barrel, a top plate is arranged at the top of the inner barrel, a middle partition plate is arranged in the middle of the inner barrel, a combustion-supporting air cavity is arranged above the middle partition plate, a fuel cavity is arranged below the middle partition plate, and the inner fuel gas gun and the outer fuel gas gun are both fixed between the middle partition plate and the top plate.
Further, flue gas reflux mechanism includes flue gas pipeline, flue gas pipeline's one end is passed through barrel central authorities enter into combustion-supporting air chamber, elbow, valve, expansion joint, draught fan are connected gradually to flue gas pipeline's the other end, the import of draught fan passes through the pipeline and links to each other with the pre-heater tobacco pipe.
Furthermore, the fuel gas inlet system comprises a fuel gas ring pipe, the fuel gas ring pipe is connected with a fuel gas connecting pipe through a connecting pipe, the fuel gas connecting pipe is connected with a feeding fuel gas pipe, and the feeding fuel gas pipe is connected with a gas conveying pipe through a metal hose.
Further, the air inlet system comprises an air ring pipe, the air ring pipe is connected with an air connecting pipe through a connecting pipe, the air connecting pipe is connected with an air inlet pipe, and the air inlet pipe is connected with an air pipe through a metal hose.
Further, be equipped with 1 ~ 4 circles of internal gas guns in the fire pan brick, every circle is 8 ~ 20 interior gas guns, fire pan brick periphery is equipped with evenly distributed's 10 ~ 80 outer gas guns.
Further, one side of barrel is connected with fire detection subassembly, observation hole subassembly respectively, it is connected with ignition pole telescopic machanism to stabilize the ignition bottom, ignition pole telescopic machanism includes the ignition pole, the ignition pole is connected with telescopic machanism, telescopic machanism passes through mounting flange and is connected with the fixed plate, the fire detection subassembly is examined the takeover including the fire, the fire is examined the takeover and is examined joint, flame detector, cooling air respectively with the fire and be connected, the observation hole subassembly is including seeing the hole pipe of fire, it is equipped with the lens to see the downthehole pipe of fire.
The invention has the beneficial effects that: by adopting the noise elimination structure and the low heat conduction design, the heat insulation and preservation performance is excellent, the outward heat dissipation loss of the burner box body is reduced to the minimum, thereby achieving the purposes of high efficiency, energy conservation, stable combustion and low NOXLow CO emission and low noise;
through designing the special multi-layer fire pan brick, the inner and outer gas guns, the flue gas reflux mechanism, the special cylinder structure and the swirler, the fuel gas is mixed with the air entering the gun barrel through the gun barrel and then enters the hearth for combustion through the swirler plate at the front end of the gun barrel, so that each gun generates swirl flame, the hearth space is utilized to the maximum extent, the fuel gas can be combusted in the whole hearth space, the heat distribution of each part in the hearth is uniform as much as possible, the average temperature and the peak temperature of the flame are reduced, the emission of NOx is reduced, and the generation of carbon monoxide is effectively avoided;
by adopting the stable ignition device with automatic electronic ignition and designing the corresponding flame arrester, interlocking mechanism and full-automatic control system on the fuel pipeline, the boiler can normally and stably run under various working conditions by the burner.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a front cross-sectional view of a high duty ultra-low nitrogen burner suitable for low heating value, low pressure fuel gas in accordance with an embodiment of the present invention;
FIG. 2 is a side view of a high duty ultra-low nitrogen burner suitable for low heating value, low pressure fuel gas in accordance with an embodiment of the present invention;
FIG. 3 is a top plan view of a high duty ultra-low nitrogen burner suitable for low heating value, low pressure fuel gas in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a stable ignition device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cyclone according to an embodiment of the present invention;
FIG. 6 is a side view of a swirler in accordance with an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a fire pan brick according to an embodiment of the invention;
in the figure: 1. Fire basin brick, 2, fire basin brick fixed cover, 3, interior gas gun, 4, barrel, 5, outer gas gun, 6, flue gas reflux mechanism, 7, stable ignition device, 8, air inlet system, 9, fuel gas inlet system, 10, swirler, 11, spinning disk, 12, swirl inner circle, 13, swirl outer circle, 14, inner tube, 15, outer tube, 16, bottom plate, 17, top plate, 18, median septum, 19, ignition device outer tube, 20, ignition gun tube, 21, flange, 22, fixed plate, 23, fire detection subassembly, 24, fire observation hole subassembly, 25, ignition rod telescopic machanism, 26, ignition rod, 27, propulsion system, 28, air inlet pipe, 29, gas inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The invention relates to a large-load ultralow-nitrogen burner suitable for low-heat-value and low-pressure fuel gas, which is a burner device of petrochemical industry boilers, metallurgical industry boilers, industrial steam boilers and power plant power station boilers, and conforms to bottom burning type, side burning type and top burning type, blue circular vortex flames are adopted, and the fuel is low-pressure and low-heat-value fuel gas: such as: the low-NOx low-CO boiler burner has the advantages that the low-NOx low-CO boiler burner can achieve the ultra-low NOx and low-CO emission requirements of a large boiler when burning low-pressure and low-heat-value fuel gas.
It is suitable for large and small boilers, is suitable for various low-pressure and low-heat value fuel gases, can be stably combusted, can effectively enable flame to rotate and fly away in an effective hearth space, disperses flame vortex, reduces the temperature of a high-temperature area in the center of the flame, and inhibits NOx from being generated.
As shown in fig. 1 to 7, the large-load ultra-low nitrogen burner suitable for low-heat value and low-pressure fuel gas according to the embodiment of the invention comprises a cylinder 4, a fire pan brick fixing sleeve 2 is mounted on the cylinder 4, the fire pan brick fixing sleeve 2 is fixedly connected with a fire pan brick 1 through a fixing bolt, an inner gas gun 3 and an outer gas gun 5 are respectively mounted on the inner side and the outer side of the fire pan brick 1, the center of the bottom of the cylinder 4 is connected with a flue gas backflow mechanism 6, a stable ignition device 7 penetrates through the flue gas backflow mechanism 6 and is fixed in the middle of an elbow of the flue gas backflow mechanism 6 and penetrates through the cylinder 4 to extend into the middle of the fire pan brick 1, and the cylinder 4 is respectively connected with an air inlet system 8 and a fuel gas inlet system 9 through flanges. One side of the cylinder 4 is respectively connected with the fire detection assembly 23 and the fire observation hole assembly 24, and the bottom end of the stable ignition device 5 is connected with the ignition rod telescopic mechanism 25. A swirler 10 is arranged in the cylinder 4; the inner gas gun 3 and the outer gas gun 5 both comprise gun barrels, and a swirler 10 is mounted inside the front ends of the gun barrels.
The stable ignition device 5 comprises an ignition device outer cylinder 19, an ignition gun tube 20, a swirler 10, a connecting piece, a flange 21, a fuel inlet air tube and a connector, an air inlet tube and a connector, a bolt, a nut and other parts, wherein the ignition gun tube 20 is arranged in the ignition device outer cylinder 19, an air inlet tube 28 (an air inlet of an ignition gun) is arranged on the outer side of the lower part of the ignition device outer cylinder 19, the flange 21 is arranged at the bottom end of the ignition device outer cylinder 19, and the flange 21 is connected with a fixing plate 22; a swirler 10 is mounted inside the front end of the ignition barrel 20. The bottom end of the ignition barrel 20 is provided with a gas inlet 29.
The swirler 10 comprises a swirler plate 11, a swirler inner ring 12 is arranged in the center of the swirler plate 11, and a swirler outer ring 13 is arranged outside the swirler plate 11.
The fire pan brick 1 is fixedly arranged in the fire pan brick fixing sleeve 2 by bolts, is connected with the cylinder body 4 and extends out of the hearth; the fire basin brick 1 is a hollow outer inclined structure, the hollow part inside and the periphery outside are air flow channels, and the inlet section of the fire basin brick is a horizontal angle of 50C～250C, air constricting flow channels. The external design has multi-level special steps and inclined planes, which is favorable for the stable and dispersed combustion of partial fuel gas along the steps and inclined planes of the fire pan brick, and is more favorable for the formation of a negative pressure area of the flue gas in the hearth due to the special structures of the steps and inclined planes of the fire pan brick, so that the flue gas forms the internal circulation of the flue gas around the fire pan brick 1; the air outlet anterior segment design is the burner port that has the inclination of 15 ~ 40 group's equipartitions, and this design does benefit to the combustor inside and outside rifle stable combustion, thereby the flame of interior rifle burning passes to the outer rifle of steadily igniting of brazier brick through the burner port to restrain NOx and discharge.
The barrel 4 comprises an inner barrel 14 and an outer barrel 15, aluminum silicate fiber cotton is filled between the outer barrel 15 and the inner barrel 14, a bottom plate 16 is arranged at the bottom of the inner barrel 14, a top plate 17 is arranged at the top of the inner barrel 14, a middle partition plate 18 is arranged in the middle of the inner barrel 14, a combustion-supporting air cavity is arranged above the middle partition plate 18, combustion-supporting air and circulating flue gas are uniformly mixed and then enter a hearth from the inner ring and the outer ring of a fire pan brick to be sufficiently combusted with fuel gas, a fuel cavity is arranged below the middle partition plate, the fuel gas enters the fuel cavity through a fuel pipeline and then enters each gun through the fuel cavity, the fuel is mixed with air at the upper end of each gun and then enters the hearth to be combusted through a swirl sheet, and the inner gas gun 3 and the outer gas gun 5 are fixed between the middle partition plate 18 and the top plate.
The fuel gas inlet system 9 comprises a fuel gas ring pipe, the fuel gas ring pipe is connected with a fuel gas connecting pipe through a connecting pipe, the fuel gas connecting pipe is connected with a feed fuel gas pipe, and the feed fuel gas pipe is connected with an on-site gas delivery pipe through a metal hose; the air inlet system 8 comprises an air ring pipe, the air ring pipe is connected with an air connecting pipe through a connecting pipe, the air connecting pipe is connected with an air inlet pipe, the air inlet pipe is connected with an on-site air pipe through a metal hose, and as fuel gas is low-pressure and low-calorific-value gas and the load of the burner is large, in order to prevent accidents, a stable fire source is designed in the center of the burner, so that the main fire is protected from being misfired under different working conditions and is not backfire to stably burn.
The inner combustion air gun 3 and the outer combustion air gun 5 are both composed of countless guns, each gun is composed of a gun barrel and a swirler 10, 1-4 circles of guns are designed in the inner cavity of the fire basin brick 1, and 8-20 special guns are uniformly distributed in each circle; 10-80 special guns are uniformly distributed and designed on the periphery of the fire pan brick; each gun is formed by adopting stainless steel pipes with different types according to different loads, a spinning disk is designed in the front end of each gun, and n air inlets are drilled at the lower end of the spinning disk; each gun has different length, and the front half of the peripheral gun has 450The angle C faces to the fire pan brick; the peripheral air gun of the fire pan brick accounts for 75 to 85 percent of the total fuel ratio; thus, multilayer flames are formed around the fire pan bricks, so that the space of the hearth is utilized to the maximum extent, fuel gas can be combusted in the space as large as possible of the whole hearth, the heat distribution of each part in the hearth is uniform, the average temperature and the peak temperature of the flames are reduced, the emission of NOx is reduced, the generation of carbon monoxide is effectively avoided, and the combustion is stable and reliable. The air guns at the periphery of the fire basin brick account for 15% -25% of the total fuel ratio, and most of air enters from the fire basin brick, so that oxygen-enriched dispersed combustion is formed, and the generation of NOx is reduced. By the fuel gas staged and staged combustion method, the space in the hearth of the industrial boiler is effectively utilized as much as possible, the average temperature and the peak temperature of flame are reduced, the internal circulation of flue gas is formed, and the generation of NOx is inhibited.
The swirler 10 is arranged between the lower part of the fire basin brick 1 and the inner cylinder 14; meanwhile, the front end of each gun is provided with a special swirler 10 with different sizes, the swirling directions of the two swirlers are opposite, when the burner works, air passes through the swirler 10, so that swirling air entering a hearth is formed into swirling air, and the swirling air and the reverse swirling air of premixed fuel gas of each gun are fully mixed to form swirling flame; under the normal working condition, firstly opening the stable ignition device 7, burning the gas sprayed by the temperature ignition device 7 to form swirl stable central flame, providing a root fire source required by stable burning for the whole burning device, then opening a main gas valve and an air valve, igniting the inner ring and the multi-layer gun to burn, forming a plurality of circles of flame on the inner ring of the fire basin brick 1, and fully mixing the flame of the inner ring with swirl air along the fire basin brick to carry out dense-dilute burning; meanwhile, a small part of flame on the inner ring is blown out from the inclined hole of the fire pan brick to ignite the outer ring gun, and the smoke in the hearth forms a negative pressure area due to the special structure of the steps and the inclined plane of the fire pan brick, so that the internal circulation of the smoke is formed, the gas is fully combusted, the flame in the hearth space of the industrial boiler is effectively utilized as far as possible, the oxygen content of the hearth is diluted, and the generated NOx is very little.
The ignition rod telescopic mechanism 25 is composed of ignition rods 26, telescopic mechanisms, fixing plates, fixing flanges, connecting bolts, nuts and other parts. The fire detection assembly 23 is composed of fire detection connection pipes, fire detection joints, flame detectors, cooling air connection pipes, joints and other parts. The fire observation hole assembly 24 is composed of a fire observation hole pipe, a fire observation hole cover, a clamping sleeve, a lens pad and other parts. The telescoping mechanism includes a propulsion system 27.
The flue gas reflux mechanism 6 comprises a flue gas pipeline (outer cylinder), an elbow, a valve, an induced draft fan, a heat preservation layer, an expansion joint, a flange, an electric actuator, a flue gas inlet connecting pipe, a bolt, a nut and other parts, wherein one end of the flue gas pipeline enters a combustion-supporting air cavity through the middle of the cylinder, the other end of the flue gas pipeline is connected with the elbow, the valve and the expansion joint and then is connected with the induced draft fan, the inlet of the induced draft fan is connected with a smoke pipe of the preheater through a flue, 10% -25% of flue gas pumped from the smoke pipe of the preheater enters the combustion-supporting air cavity and is mixed with combustion-supporting.
The heavy-load ultralow-nitrogen burner suitable for low-heat-value and low-pressure fuel gas has the following characteristics:
（1）the design of special multi-level unique modularized burner basin brick and the jet flow anaerobic and oxygen-enriched combustion technology are characterized in that air flow channels are arranged at the hollow part inside the basin brick and around the outside of the basin brick, and the horizontal angle of the inner inlet section of the basin brick is 50C～250The air of C contracts the flow channel to facilitate the smooth transition of the air into the air flow channel. The external design has multilayer special steps and inclined planes, which is favorable for the stable and dispersed combustion of partial fuel gas along the steps and inclined planes of the fire pan bricks and is more favorable for the formation of a negative pressure area of the flue gas in the hearth due to the special structures of the steps and inclined planes of the fire pan bricks, thereby leading the flue gas to form flue gas internal circulation around the fire pan bricks; the air outlet anterior segment design is the burner port that has the inclination of 15 ~ 40 group's equipartitions, and this design is favorable to the combustor inside and outside rifle stable combustion, thereby the flame of interior rifle burning passes to the outer rifle of steadily igniting of brazier brick through the burner port to restrain NOx and discharge.
(2) In the specially designed stable ignition device (see fig. 4), because the fuel gas is low-pressure and low-heat value gas and the load of the burner is large, in order to prevent accidents, a stable fire source is designed in the center of the burner to protect main fire from misfiring and stable combustion without backfire under different working conditions.
(3) The specially designed barrel structure: the cylinder body consists of an inner cylinder and an outer cylinder, and aluminum silicate cellucotton with the thickness of 50 mm-80 mm is clamped between the inner cylinder and the outer cylinder; a plurality of cavities are designed in the inner cylinder, a fuel gas cavity, an air inlet cavity and a circulating flue gas cavity are formed in the inner cylinder, a stable ignition device is fixedly arranged in the center of the inner cavity, and an inner gas gun and an outer gas gun are respectively fixed between a partition plate and a top plate of the inner cylinder, so that the inner gas gun and the outer gas gun are vertical and have no deviation.
(4) The inner and outer gas guns are specially designed, 1-4 circles of guns are designed in the inner cavity of the fire pan brick, and 8-20 special guns are uniformly distributed in each circle; 10-80 special guns are uniformly distributed and designed on the periphery of the fire pan brick; each gun is formed by adopting stainless steel pipes with different types according to different loads, a spinning disk is designed in the front end of each gun, and n air inlets are drilled at the lower end of the spinning disk; each gun has different length, and the front half of the peripheral gun has 450The angle C faces to the fire pan brick; the peripheral gas gun of the fire pan brick accounts for 75 percent to 85 percent of the total fuel ratio; thus around the fire pan brickMulti-level flames are formed, so that the space of the hearth is utilized to the maximum extent, fuel gas can be combusted in the space as large as possible of the whole combustion chamber, the heat load of each part in the hearth is uniform, the average temperature and the peak temperature of the flames are reduced, the emission of NOx is reduced, the generation of carbon monoxide is effectively avoided, and the combustion is stable and reliable. The fuel ratio of the fuel gas guns at the periphery of the fire basin brick is 15% -25%, and most of air enters the fire basin brick, so that oxygen-enriched dispersed combustion is formed, and the generation of NOx is reduced.
(5) The swirler structure of the burner with special design designs the swirler structures with special sizes on the burner barrel and each gun, the direction of the swirl vanes on the burner barrel is opposite to that of the swirl vanes on each gun, so that strong swirl air is formed after the air passes through the swirler, the gas and the air are more uniformly mixed, and the swirling rotating and elegant flame is formed.
In conclusion, by means of the technical scheme, the low-pressure combustion, the low-heat value combustion, the fuel classification, the semi-premixing of the fuel and the air, the intensified mixing, the non-equivalent staged combustion, the thick and thin combustion, the self-jet technology, the flue gas recirculation technology in the hearth, the flue gas recirculation technology and the dispersed combustion technology are adopted, the central temperature of the combustion flame is reduced, and NO is controlledXThe resulting combustion technique. The regulation ratio is large, the operation flexibility is wide, so that fuel gas grading and staged combustion are realized, the fuel combustion fully and completely adopts a fuel gas grading and staged combustion method, the space in the hearth of the industrial boiler is effectively utilized as much as possible to disperse the flame, a stable annular cylindrical flame is formed through a special fire pan brick, the average temperature and the peak temperature of the flame are reduced, the internal circulation of the flue gas is formed, and meanwhile, the external flue gas recirculation technology is added, so that the best effect of inhibiting the emission of NOx is achieved; thereby realizing ultra-low NOx and low CO emission.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A large-load ultralow-nitrogen burner suitable for low-heat-value and low-pressure fuel gas comprises a barrel (4), wherein a fire pan brick fixing sleeve (2) is installed on the barrel (4), the fire pan brick fixing sleeve (2) is fixedly connected with a fire pan brick (1), and the large-load ultralow-nitrogen burner is characterized in that an inner gas gun (3) and an outer gas gun (5) are respectively installed on the inner side and the outer side of the fire pan brick (1), the center of the bottom of the barrel (4) is connected with a flue gas backflow mechanism (6), a stable ignition device (7) penetrates through the flue gas backflow mechanism (6), and the barrel (4) is respectively connected with an air inlet system (8) and a fuel gas inlet system (9) through flanges;
the fire pan brick (1) is of a hollow structure, and the outer wall of the fire pan brick (1) is provided with steps and an inclined plane.
2. A burner according to claim 1, characterized in that a swirler (10) is mounted in the barrel (4); interior gas gun (3), outer gas gun (5) all include the barrel, the front end internally mounted of barrel has swirler (10).
3. Burner according to claim 1, characterized in that the stable ignition device (5) comprises an ignition device outer cylinder (19), an ignition gun tube (20) is arranged in the ignition device outer cylinder (19), an ignition gun air inlet is arranged at the lower outer side of the ignition device outer cylinder (19), a flange (21) is arranged at the bottom end of the ignition device outer cylinder, and the flange (21) is connected with a fixing plate (22); and a swirler (10) is arranged in the front end of the ignition barrel (20).
4. A burner according to claim 2 or 3, characterized in that the swirler (10) comprises a swirler plate (11), an inner swirler ring (12) is arranged in the center of the swirler plate (11), and an outer swirler ring (13) is arranged outside the swirler plate (11).
5. The burner according to claim 1, wherein the barrel (4) comprises an inner barrel (14) and an outer barrel (15), aluminum silicate fiber cotton is filled between the outer barrel (15) and the inner barrel (14), a bottom plate (16) is arranged at the bottom of the inner barrel (14), a top plate (17) is arranged at the top of the inner barrel (14), a middle partition plate (18) is arranged in the middle of the inner barrel (14), a combustion-supporting air cavity is arranged above the middle partition plate (18), a fuel cavity is arranged below the middle partition plate, and the inner gas gun (3) and the outer gas gun (5) are both fixed between the middle partition plate (18) and the top plate (17).
6. The burner according to claim 1, wherein the flue gas recirculation mechanism (6) comprises a flue gas pipeline, one end of the flue gas pipeline enters the combustion air cavity through the center of the cylinder, the other end of the flue gas pipeline is sequentially connected with an elbow, a valve, an expansion joint and an induced draft fan, and an inlet of the induced draft fan is connected with a smoke pipe of a preheater through a pipeline.
7. Burner according to claim 1, wherein the feed fuel gas system (9) comprises a gas loop pipe, which is connected to a gas connecting pipe via a connecting pipe, which is connected to a feed fuel gas pipe, which is connected to a gas delivery pipe via a metal hose.
8. Burner according to claim 1, characterized in that the air intake system (8) comprises an air loop connected by a connecting pipe to an air connecting pipe connected to an air intake pipe connected to an air pipe by a metal hose.
9. The boiler burner according to claim 1, wherein 1-4 circles of inner gas guns (3) are arranged in the fire pan brick (1), each circle comprises 8-20 inner gas guns (3), and 10-80 outer gas guns (5) are uniformly distributed on the periphery of the fire pan brick.
10. The burner according to claim 1, wherein one side of the barrel (4) is respectively connected with a fire detection assembly (23) and a fire observation hole assembly (24), the bottom end of the stable ignition device (5) is connected with an ignition rod telescopic mechanism (25), the ignition rod telescopic mechanism (25) comprises an ignition rod (26), the ignition rod (26) is connected with the telescopic mechanism, the telescopic mechanism is connected with the fixing plate (22), the fire detection assembly (23) comprises a fire detection connection pipe, the fire detection connection pipe is respectively connected with a fire detection joint, a flame detector and a cooling air connection pipe, the fire observation hole assembly (24) comprises a fire observation hole pipe, and a lens is arranged in the fire observation hole pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064452.5A CN110848681A (en) | 2019-11-04 | 2019-11-04 | Large-load ultralow-nitrogen combustor suitable for low-heat-value and low-pressure fuel gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064452.5A CN110848681A (en) | 2019-11-04 | 2019-11-04 | Large-load ultralow-nitrogen combustor suitable for low-heat-value and low-pressure fuel gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110848681A true CN110848681A (en) | 2020-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911064452.5A Pending CN110848681A (en) | 2019-11-04 | 2019-11-04 | Large-load ultralow-nitrogen combustor suitable for low-heat-value and low-pressure fuel gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336512A (en) * | 2020-03-31 | 2020-06-26 | 龙佰四川钛业有限公司 | Design method of natural gas burner and hot blast stove |
| CN111520715A (en) * | 2020-04-03 | 2020-08-11 | 岳阳远东节能设备有限公司 | Biomass gas burning and online ash and coke cleaning low-nitrogen combustor |
| CN111520721A (en) * | 2020-04-03 | 2020-08-11 | 岳阳远东节能设备有限公司 | Low-NOx-emission efficient energy-saving combustor capable of burning heavy oil, oil slurry and fuel gas |
-
2019
- 2019-11-04 CN CN201911064452.5A patent/CN110848681A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336512A (en) * | 2020-03-31 | 2020-06-26 | 龙佰四川钛业有限公司 | Design method of natural gas burner and hot blast stove |
| CN111336512B (en) * | 2020-03-31 | 2021-09-21 | 龙佰四川钛业有限公司 | Design method of natural gas burner and hot blast stove |
| CN111520715A (en) * | 2020-04-03 | 2020-08-11 | 岳阳远东节能设备有限公司 | Biomass gas burning and online ash and coke cleaning low-nitrogen combustor |
| CN111520721A (en) * | 2020-04-03 | 2020-08-11 | 岳阳远东节能设备有限公司 | Low-NOx-emission efficient energy-saving combustor capable of burning heavy oil, oil slurry and fuel gas |
| CN111520715B (en) * | 2020-04-03 | 2022-10-25 | 岳阳远东节能设备有限公司 | Biomass gas burning and online ash and coke cleaning low-nitrogen combustor |
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