CN111089289A - Multistage internal circulation low-nitrogen gas burner device - Google Patents
Multistage internal circulation low-nitrogen gas burner device Download PDFInfo
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- CN111089289A CN111089289A CN201911221277.6A CN201911221277A CN111089289A CN 111089289 A CN111089289 A CN 111089289A CN 201911221277 A CN201911221277 A CN 201911221277A CN 111089289 A CN111089289 A CN 111089289A
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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
- F23D14/46—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
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
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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
- F23D14/66—Preheating the combustion air or gas
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention relates to a multistage internal circulation low-nitrogen gas burner device, which comprises a combustion part with a flue gas guide cover, an air compression cylinder, a plurality of outer ring gun gas pipes, a central air taking cylinder, a swirler, a central gun, a plurality of primary injection guns, a plurality of secondary injection guns and a throat opening, wherein the flue gas guide cover is in a cone shape, one end with a small opening is communicated with the air compression cylinder and is positioned at one end of the throat opening, the central air taking cylinder is arranged at the center of the throat opening, the swirler is arranged at the other end of the central air taking cylinder and is positioned at the outer side of the central gun, the plurality of primary injection guns and the secondary injection guns are uniformly arranged in the throat opening along the circumference and are positioned between the throat opening and the central air taking cylinder, the primary injection guns are arranged corresponding to the secondary injection guns, the axial lines of the primary injection guns are parallel to the axial lines of the secondary injection guns, the secondary injection guns are communicated with the primary injection guns, and the gun heads, one end of the outer gun gas pipe penetrates through the flue gas guide sleeve and is communicated with the primary injection gun in the throat.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a multistage internal circulation low-nitrogen gas burner device.
Background
Most of the ultralow-nitrogen combustors on the market adopt a flue gas external circulation mode to carry out ultralow-nitrogen emission, and although the mode can well reduce the emission of nitrogen oxides, the flue gas external circulation mode is utilized to carry out ultralow-nitrogen emission, so that a great number of problems exist. For example: the increase of the condensed water is a main contradiction, and the problem of damage of electronic fire detection of a machine caused by the increase of the condensed water is considered to be that the fire detection in the market comprises international technology leaders such as Siemens (SIEMENS) Honeywell and the like, which cannot be well solved so far.
In addition, according to the existing calculation mode, most of burners adopting the flue gas external circulation mode to carry out ultralow nitrogen emission can reduce the energy efficiency, and the energy efficiency test on the boiler adopting the flue gas external circulation mode shows that the low nitrogen modification mode adopting the flue gas external circulation mode generally reduces the energy efficiency by about 3%.
Disclosure of Invention
Under this background, multistage inner loop low-nitrogen gas burner device alright effectively solve the general illness of the ultralow nitrogen combustor of flue gas extrinsic cycle, at first multistage inner loop low-nitrogen gas burner device utilizes self inner loop mode, and it needs the flue gas to leave the boiler body and passes through specific flue secondary mixed combustion to be different from the flue gas extrinsic cycle, so the comdenstion water can not influence the inside electrical components of combustor through the fan, from the fundamental solution problem. In addition, the problems caused by the reduction of the smoke temperature due to the external circulation of the smoke are also radically treated.
In order to solve the problems, the invention provides a multistage internal circulation low-nitrogen gas burner device which is an important component in an ultra-low nitrogen burner, is mainly applied to the ultra-low nitrogen burner and belongs to an ultra-low nitrogen emission environment-friendly device.
The invention provides a multistage internal circulation low-nitrogen gas burner device which is characterized by comprising a combustion part, wherein the combustion part comprises a flue gas guide cover, an air compression cylinder, a plurality of outer ring gun gas pipes, a central air taking cylinder, a swirler, a central gun, a plurality of primary injection guns, a plurality of secondary injection guns and a throat opening, the throat opening is in a cylindrical shape with two open ends, one end of the throat opening is connected with the outer wall of the flue gas guide cover through a first connecting piece, the other end of the throat opening is a free end, the flue gas guide cover is in a conical cylinder shape, one end with a small opening is communicated with the air compression cylinder and is positioned at one end of the throat opening and used for enabling the flue gas in a boiler combustion chamber to flow back into the throat opening from the included angle between the throat opening and the flue gas guide cover, the central air taking cylinder is arranged at the center of the throat opening, the axis of the central air taking cylinder is collinear with the axis of the throat opening, the cyclone is arranged at the other end of the central air taking barrel, the cyclone is arranged at the outer side of the central gun, the axis of the central gun is collinear with the axis of the throat, two ends of the central gun are respectively positioned at two sides of the cyclone, a plurality of secondary spray guns are uniformly arranged in the throat along the circumference and positioned between the throat and the central air taking barrel, the axes of the secondary spray guns are parallel to the axis of the throat, the head of each secondary spray gun is positioned at the outlet end of the throat, the tail of each secondary spray gun is positioned in the throat, a plurality of primary spray guns are uniformly arranged in the throat along the circumference and positioned between the throat and the central air taking barrel, the primary spray guns are arranged corresponding to the secondary spray guns, the axes of the primary spray guns are parallel to the axes of the secondary spray guns, each of the primary spray guns and the secondary spray guns is provided with a tubular gun head and a gun body, the cross sections of the gun bodies are smaller than that of the gun bodies, the secondary spray guns are communicated with the, the outer ring gun gas pipes are arranged corresponding to the first-stage injection gun, and one end of each outer ring gun gas pipe penetrates through the smoke guide cover and is communicated with the first-stage injection gun in the throat.
In the multistage internal circulation low-nitrogen gas burner device provided by the invention, the device is characterized by further comprising: the gas inlet part comprises a shell, a gas ring part and a gas inlet pipe, wherein the shell is cylindrical, two ends of the shell are open, one end of the shell is connected and communicated with the flue gas guide cover, the gas ring part is cylindrical and arranged in the shell, the axis of the gas ring part is collinear with the axis of the shell, the section of the gas ring part is a circular ring, one end of the gas inlet pipe is communicated with the gas ring part, the other end of the gas inlet pipe is communicated with an external gas source, and the axis of the gas inlet pipe is perpendicular to the axis of the shell.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention can also have the following characteristics: wherein, the cross-sectional area of the housing: cross-sectional area of air compression cylinder: the cross-sectional area of the central wind taking barrel is 2:1.25: 1-8: 2.5: 1.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention can also have the following characteristics: wherein the ratio of the section of the gun body of the secondary spray gun to the section of the gun head is 3: 1-6: 1, and the ratio of the section of the gun body of the primary spray gun to the section of the gun head is 1.5: 1-3: 1.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention can also have the following characteristics: wherein, the distance between the head of the secondary spray gun and the head of the central spray gun is 70 mm-190 mm.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention can also have the following characteristics: wherein, the ratio of the gun body cross-section of the second grade spray gun to the gun body cross-section of the first grade spray gun is 1.5: 1-2.5: 1, the ratio of the cross section of the gun body of the primary injection gun to the cross section of the outer ring gun gas pipe is 1.5: 1-2.5: 1, and the superposition size of the primary spray gun and the secondary spray gun is-20-60 mm.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention is characterized by further comprising an ignition gun, wherein the axis of the ignition gun is collinear with the axis of the throat, one end of the ignition gun is positioned in the central gun, and the other end of the ignition gun penetrates through the gas ring piece to be communicated with an external gas source.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention can also have the following characteristics: wherein, a plurality of injection holes are uniformly arranged on the central gun along the circumference, and the included angle between the axis of the injection hole and the axis of the central gun is 0-90 degrees.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention can also have the following characteristics: wherein the ratio of the sectional area of the throat opening to the sectional area of the central air taking barrel is 1.75: 1-5: 1.
In addition, the multistage internal circulation low-nitrogen gas burner device provided by the invention can also have the following characteristics: the swirler comprises an outer ring, an inner ring and a plurality of blades, the thickness of the outer ring is larger than that of the inner ring, the blades are in a right trapezoid shape, the width of the top edge is the same as that of the inner ring, the width of the bottom edge is the same as that of the outer ring, and the included angle between the plane of each blade and the axis of the inner ring is 7-70 degrees.
Action and Effect of the invention
According to the multistage internal circulation low-nitrogen gas burner device, flue gas is forced to blow directly in the boiler combustion chamber, local low pressure caused by internal forced acceleration is carried out by using the Bernoulli principle, and then the flue gas in the boiler combustion chamber outside the flow guide throat is forced to circulate, so that the aim of preheating natural gas and air coming in from the air blower is achieved, and combustion is more stable.
Secondly, compared with the air, the recycled flue gas is used as a combustion supporter, and the relatively low content of oxygen atoms and nitrogen atoms is more beneficial to reducing the emission of nitrogen oxides.
Further, the outside gas circulation of comparing can lead to flue gas cooling to reduce the combustor thermal efficiency, and inside gas circulation is bad than outside gas circulation, and the reaction is in the boiler combustion chamber, is favorable to the combustor thermal efficiency more (according to carrying out the efficiency test to the boiler that the gas extrinsic cycle was reformed transform and finds, this kind of mode low-nitrogen transformation mode generally reduces the efficiency about 3%).
Further, the multistage internal circulation low-nitrogen gas burner device divides a gas gun into coaxial different reference circles, the reference circle of the gun head for secondary injection is large and is far away from the position of the burner smoke circulating flow guide assembly, and the reference circle of the center gun is small and is relatively close to the position of the burner smoke circulating flow guide assembly. The positions before and after placement are different, layering and segmentation are formed, and the problem of gas concentration is solved. The phenomenon that the local temperature is overhigh due to the concentration of fuel gas is avoided, so that the thermal nitrogen oxide is generated due to the reaction.
Further, the outermost ring of the multistage internal circulation low-nitrogen gas burner device is formed by fully utilizing gas, wind and smoke to mix and then burn, firstly, air and gas are mixed in the first-stage injection gun head, and then the gas in the second-stage injection gun head is uniformly mixed with air and recovered smoke layer by layer. Its aim at better messenger is natural and air mixing, lets the flue gas participate in preheating and makes the burning more steady, avoids mixing the gas that the abundant leads to and remains, and this method can let the natural gas abundant burning not extravagant, improves combustor efficiency, can let the gas burning not fierce again, further reduces instantaneous nitrogen oxide.
Furthermore, the central air of the multistage internal circulation low-nitrogen gas burner device adopts an independent air supply system, and the aim is that external smoke is not interfered. Compared with the external gas flow, the central gas flow is relatively less, the independent air supply system enables the internal fluid and the external fluid not to interfere with each other, the central structure mode of the independent air supply is unchanged aiming at the condition that the boiler furnace structure is different, and the combustion can be always stable.
Furthermore, the multi-stage internal circulation low-nitrogen gas burner device is relatively low in gas consumption of a central inner ring gun and provided with a swirler, the purpose is to prevent oxygen atoms and nitrogen atoms in air from reacting under catalysis of central fire at a high temperature, the central flame exists to stabilize the whole flame, flameout and shutdown or even danger when the load of the burner is changed due to the formation of a central cavity is prevented, and the device can well solve the problems of central flame stabilization and central temperature overhigh.
Drawings
FIG. 1 is a schematic cross-sectional view of a multi-stage internal recycle low-NOx gas burner apparatus in an embodiment of the present invention;
FIG. 2 is a schematic side view of a multi-stage internal circulation low-NOx gas burner apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the operation of the gas in a multi-stage internal circulation low-NOx gas burner apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of the positions of components in a multi-stage internal recycle low-NOx gas burner apparatus in an embodiment of the present invention;
FIG. 5 is a schematic elevational view of a swirler in an embodiment of the present invention;
FIG. 6 is a schematic front view of a single piece swirler in an embodiment of the invention;
FIG. 7 is a schematic top view of FIG. 6;
FIG. 8 is a side schematic view of FIG. 6;
fig. 9 is a schematic cross-sectional view of a center gun.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically describe the multistage internal circulation low-nitrogen gas burner device of the invention.
Examples
As shown in fig. 1 and 2, the multistage internal circulation low-nitrogen gas burner apparatus is installed in a boiler to heat the boiler, and includes an air inlet part 10 and a combustion part 20.
As shown in fig. 3, the boiler is located in the combustion zone on the left side of the figure, and the multi-stage internal circulation low-nitrogen gas burner apparatus is located on the right side.
One end of the air intake part 10 is communicated with one end of the combustion part 20, and the other end of the air intake part 10 is provided with a blowing device for blowing air to the air intake part 10.
The air inlet portion 10 includes a housing 11, an air ring member 12, and an air inlet pipe 13.
The housing 11 is in a straight tubular shape and has openings at both ends.
The gas ring member 12 is cylindrical, a cylinder is arranged in the gas ring member 12, the cylinder and the cylinder wall of the gas ring member 12 form an annular gas passage 121, the gas ring member 12 is arranged in the shell 11, the axis of the gas ring member 12 is collinear with the axis of the shell 11, and the section of the gas ring member 12 is a circular ring.
One end of the air inlet pipe 13 is communicated with the air ring member 12, the other end is communicated with an external air source, the axis of the air inlet pipe 13 is perpendicular to the axis of the shell 11, and in the embodiment, the air inlet pipe 13 is communicated with the annular air passage 121 of the air ring member 12. The root of the air inlet pipe 13 is welded with the gas ring piece 12, the gas ring piece 12 is communicated with the outer ring gun gas pipe, and the gas is dispersed from the gas ring piece 12 by the outer ring gun gas pipe so as to achieve the purpose of layering.
The combustion part 20 comprises a flue gas guide cover 21, an air compression cylinder 211, a plurality of outer ring gun gas pipes 22, a central gun 27, a central wind extracting cylinder 25, a swirler 26, an ignition gun 24, a plurality of primary injection guns 23, a plurality of secondary injection guns 28 and a throat 29.
The flue gas guide cover 21 is in a cone shape, one end with a large opening is connected and communicated with one end of the shell 11 and keeps sealed, one end with a small opening is communicated with the air compression cylinder 211 and is located at one end of the throat 29, the flue gas in the boiler combustion chamber flows back into the throat 29 from the included angle between the throat 29 and the flue gas guide cover 21, the air compression cylinder 211 is in a straight cylinder shape, and two ends of the air compression cylinder are open. The flue gas guide sleeve 21 is collinear with the axis of the housing 11.
The throat 29 is a cylinder with two open ends, one end is connected with the outer wall of the flue gas guide cover 21 through a connecting piece 291, and the other end is a free end.
As shown in fig. 3, the multi-stage internal circulation low-nitrogen gas burner device of the present embodiment uses forced air to guide the air (air) from the inside of the flue gas guide housing 21 into the two-stage injection lance 28 and the central air intake duct 25 in the throat 29. The Bernoulli principle is utilized to carry out internal forced acceleration to bring local low pressure, and then the smoke in the boiler combustion chamber outside the flow guiding throat 29 is forced to circulate. The local low pressure outside the small end of the flue gas guide cover 21 ensures that the flue gas in the combustion chamber of the boiler forcibly flows back into the throat 29 from the included angle between the throat 29 and the flue gas guide cover 21. One of the purposes is to preheat natural gas and air from a blower to make combustion more stable. In addition, the recycled flue gas is utilized as a combustion supporter, and the relatively low content of oxygen atoms and nitrogen atoms is more beneficial to reducing the emission of nitrogen oxides. Further, the outside gas circulation of comparing can lead to flue gas cooling to reduce the combustor thermal efficiency, and inside gas circulation is bad than outside gas circulation, and the reaction is in the boiler combustion chamber, is favorable to the combustor thermal efficiency more (according to carrying out the efficiency test to the boiler that the gas extrinsic cycle was reformed transform and finds, this kind of mode low-nitrogen transformation mode generally reduces the efficiency about 3%).
The central air taking barrel 25 is arranged in the center of the throat 29, the axis of the central air taking barrel 25 is collinear with the axis of the throat 29, one end of the central air taking barrel 25 is connected with the inner wall of the air compression barrel 22 through at least one connecting piece 251, and the cyclone 26 is arranged at the port of the other end of the central air taking barrel 26.
As shown in FIG. 4, the ratio of the inner diameter e1 of the throat opening to the outer diameter c2 of the central air intake tube 25 is 1.75: 1-5: 1. This ratio is used to adjust the amount of wind (air) passing through, thereby affecting the length and diameter of the flame.
The central air intake barrel 25 in the multistage internal circulation low-nitrogen gas burner device adopts an independent air supply system, and aims to prevent external smoke from interfering. Compared with the external gas flow, the central gas flow is relatively less, the independent air supply system enables the internal fluid and the external fluid not to interfere with each other, the central structure mode of the independent air supply is unchanged aiming at the condition that the boiler furnace structure is different, and the combustion can be always stable.
In the embodiment, the casing 11, the air compression cylinder 211 and the central air-taking cylinder 25 are all cylindrical cylinders, as shown in fig. 4, the ratio of the outer diameter c3 of the casing 11 to the inner diameter c1 of the air compression cylinder 211 and the outer diameter c2 of the central air-taking cylinder 25 is related to whether the bernoulli principle can be applied to the device, and the value range of the ratio of c3: c1: c2 is 2:1.25: 1-8: 2.5: 1.
The swirler 26 is arranged in the central air taking barrel 25 and is positioned at the port of the central air taking barrel 25 and used for generating swirling air, in the embodiment, the outer wall of the swirler 26 is connected with the inner wall of the central air taking barrel 25, the swirler 26 is welded with the central air taking barrel 25, and the axis of the swirler 26 is collinear with the axis of the central air taking barrel 25.
As shown in fig. 5, the swirler 26 includes an outer ring 261, an inner ring 262, and a plurality of vanes 263.
The thickness of the outer race 261 is greater than the thickness of the inner race 262, one side of the inner race 262 is flush with the side 2611 of the outer race 261, and the other side of the inner race 262 is within the outer race 261.
As shown in fig. 6, 7 and 8, the blade 263 has a right trapezoid shape, the width of the top side is the same as the thickness of the inner ring 262, the width of the bottom side is the same as the thickness of the outer ring 261, and the included angle between the plane of the blade 263 and the axis of the inner ring 262 is b.
The number of the blades 263 is 5-10, and the value range of the angle b is 7-70 degrees. In the embodiment, the side 2611 of the outer ring 261 faces the outlet end of the throat 29, the number of blades 263 is 6, and the angle b is 60 °.
The central gun 27 is arranged in the cyclone 26, the axis of the central gun 27 is collinear with the axis of the cyclone 26, and two ends of the central gun 27 are respectively positioned at two sides of the cyclone 26.
In an embodiment, the center lance 27 is welded to the swirler 26, and the center lance 27 feed air comes from a separate feed air bypass.
As shown in fig. 9, the central gun 27 is annular, an annular air passage 271 is arranged in the annular wall, a plurality of injection holes 272 shown in fig. 2 are uniformly arranged on the central gun 27 along the circumference, the included angle between the axis of the injection hole 272 and the axis of the central gun 27 is 0-90 °, the injection holes 272 are positioned at one end of the central gun 27 and are communicated with the outside and the annular air passage 271, and the number of the injection holes 272 is 6-12. The other end of the center gun 27 is further provided with a through hole for communicating the outside with the annular air passage 271, one end of a gas delivery pipe (not shown) is communicated with the through hole, and the other end of the gas delivery pipe is communicated with a natural gas source to deliver natural gas to the center gun 27.
In the embodiment, the number of the injection holes 272 is 6, and the injection holes 272 correspond to the middle of the blades 263.
In the embodiment, the central lance 27 has relatively less fuel gas, and the swirler 26 is arranged on the outer side, so as to prevent oxygen atoms and nitrogen atoms in the air from reacting under the catalysis of the higher temperature of the central flame due to the overhigh central temperature, the central flame exists to stabilize the whole flame, and flameout and shutdown even danger are prevented when the load of the burner is changed due to the formation of a central cavity, and the central lance 27 and the swirler 26 are configured to well solve the problems of central flame stabilization and overhigh central temperature.
The ignition gun 24 is tubular and has a gun head with an axis collinear with the axis of the throat 29, and the head of the ignition gun 24 is located at one end within the central gun 27 and at the other end in communication with an external gas source through the gas ring member 12.
In the embodiment, the ignition gun 24 is placed on the inner support of the center gun 27 and is fixed by snap-fitting.
The secondary spray guns 28 are uniformly arranged in the throat 29 along the circumference and positioned between the throat 29 and the central air intake barrel 25, the axes of the secondary spray guns are parallel to the axis of the throat 29, the heads of the secondary spray guns 28 are positioned at the outlet end of the throat 29, the tails of the secondary spray guns 28 are positioned in the throat 29,
the primary spray guns 23 are uniformly arranged in the throat 29 along the circumference and are positioned between the throat 29 and the central air intake barrel 25, the primary spray guns 23 are arranged corresponding to the secondary spray guns 28, the axis of the primary spray guns 23 is parallel to the axis of the secondary spray guns 28, and in the embodiment, the axis of the primary spray guns 23 is collinear with the axis of the secondary spray guns 28.
The first-stage spray gun 23 and the second-stage spray gun 28 are both provided with tubular gun heads and gun bodies, the cross sections of the gun heads are smaller than that of the gun bodies, and in the embodiment, the connection shapes between the gun heads of the first-stage spray gun 23 and the second-stage spray gun 28 and the gun bodies are frustum-shaped.
The ratio of the lance diameter b1 to the lance tip diameter b2 of the primary lance 23 is 1.5:1 to 3: 1. The ratio of b1 to b2 represents how well the primary tips mix. The experimental research shows that the mixing ratio is proper between 1.5:1 and 3:1, and the full mixing and the normal operation of the fluid can be guaranteed in the range. And the area ratio also determines the flue gas recovery effect between the primary spray gun and the secondary spray gun.
The ratio of the cross section of the gun body of the secondary spray gun 23 to the cross section of the gun body of the primary spray gun 28 is 1.5: 1-2.5: 1. a 1: b1 is defined as 1.5: 1-2.5: 1, which can bring about relatively suitable flue gas recovery.
The ratio of the diameter a1 of the gun body of the secondary spray gun 28 to the diameter a2 of the gun head is 3: 1-6: 1, the ratio of a1 to a2 determines the diameter of flame and the length of the flame, the diameter of the flame determines the length of the flame matched with a hearth, and when the diameter of the flame is too large, the flame can cause the carbon deposition in a boiler hearth (the hearth: a three-dimensional space surrounded by a furnace wall and used for fuel combustion, the hearth has the function of ensuring that the fuel is burnt out as far as possible and cooling the temperature of the flue gas at the outlet of the hearth to the temperature allowed by the safe operation of a convection heating surface, therefore, the hearth has enough volume and can be provided with enough heating surfaces, in addition, the hearth has reasonable shape and size so as to be matched with a burner and organize an air power field in the furnace, so that the flame does not adhere to the wall, does not impact on the wall, has high fullness, and has uniform wall surface thermal load, and the carbon deposition, the rear furnace wall of the boiler can be washed by too long flame, the rear furnace wall of the boiler can be burnt out by long flame, and the discharge is too high due to too short flame.
The dimension h is the relative position distance of the head of the secondary spray gun 28 and the head of the central gun 27, which determines the stability of the burner and the root of the ultra-low emissions, and ranges from 70 mm to 190 mm. Oversized burners have low parameters but the overall flame is relatively unstable, and undersized burners have overall stability but emissions can be too high. In addition, the size is obtained through experimental data of furnace sizes and resistance of various gas boilers.
The secondary spray gun 28 is communicated with the primary spray gun 23, and the head of the primary spray gun 23 extends into the tail of the secondary spray gun 28, in the embodiment, the primary spray gun 23 and the secondary spray gun 28 have overlapped parts.
The overlapping dimension d1 of the primary spray gun 23 and the secondary spray gun 28 is-20-60 mm. The range is actually defined for the diameter size of the hearth, and can be defined as that the larger the diameter size of the hearth is, the more superposition is carried out, and conversely, the range can be well adapted to various gas boilers.
The distance between the head of the secondary spray gun and the head of the central spray gun is 70-190 mm.
The outer ring gun gas pipes 22 are arranged corresponding to the primary injection guns 23, one end of each outer ring gun gas pipe 22 penetrates through the smoke guide cover 21 and is communicated with the primary injection guns 23 in the throat opening 29, and the other end of each outer ring gun gas pipe is connected with the annular gas passage 121 of the air ring piece 12.
In the embodiment, the outer ring gun gas pipe 22 and the primary injection gun head 23 are correspondingly connected, are aligned relative to the axial center and are integrated into a whole.
The ratio of the outer diameter b2 of the gun body of the primary injection gun 23 to the outer diameter b3 of the outer ring gun gas pipe 22 is 1.5: 1-2.5: 1, and the ratio of b2 to b3 actually represents the ratio of the outer gun gas pipe 22 to the primary injection gun 23, and the ratio range is 1.5: 1-2.5: 1, the range influences the normal operation of the outer ring gas gun, and when the proportion value is smaller than the range, the outer ring gas gun cannot normally operate, so that gas flows out from the smoke circulation flow guide assembly and the interlayer of the central cylinder, flame is easy to return to the inside of the combustion machine, and explosion danger is caused.
The dimension d2 is actually the distance between the head of the outer ring gas pipe 22 and the primary spray gun head 23, and the importance of the dimension is that the dimension can be adjusted according to the resistance of an actual hearth. Boilers on the market are different, and similar to boiler economizers, air preheaters often cannot be installed for small and medium-sized enterprises, so that the range is suitable for matching with boilers better.
In the embodiment, the outermost ring of the multi-stage internal circulation low-nitrogen gas burner device is a gas gun which fully utilizes gas, wind and smoke to mix and then burn, firstly, air and gas are mixed in the first-stage injection gun head, and then the gas in the second-stage injection gun head is uniformly mixed with air and recovered smoke layer by layer. Its aim at better messenger is natural and air mixing, lets the flue gas participate in preheating and makes the burning more steady, avoids mixing the gas that the abundant leads to and remains, and this method can let the natural gas abundant burning not extravagant, improves combustor efficiency, can let the gas burning not fierce again, further reduces instantaneous nitrogen oxide.
In the embodiment, as shown in fig. 2, the number of the secondary spray guns 28 is 6. The secondary injection gun 28 makes full use of the fact that the fuel gas is mixed with the air and the flue gas and then combusted, as shown in fig. 3, the flue gas and the air (air) returning to the combustor in the combustion chamber at the tail of the outer ring gun 28 enter the outer ring gun 28 and are mixed with the natural gas entering from the secondary injection gun 23 in the outer ring gun 28 to form mixed gas which is output.
In the embodiment, the secondary spray gun 28, the center gun 27, and the ignition gun 24 are arranged in stages.
As shown in fig. 2, the two-stage spray gun 28, the center gun 27 and the ignition gun 24 are radially divided into 3 layers according to the size of a reference circle, wherein a is the reference circle of the two-stage spray gun 28, B is the reference circle of the injection hole 272, and C is the reference circle of the head of the ignition gun 24.
In an embodiment, the multi-stage internal circulation low-nitrogen gas burner device divides a gas gun into coaxial different reference circles, the secondary injection gun 28 has a large reference circle and is far away from the position of the burner smoke circulating and guiding assembly, and the central gun reference circle is small and is relatively close to the position of the burner smoke circulating and guiding assembly. The positions before and after placement are different, layering and segmentation are formed, and the problem of gas concentration is solved. The phenomenon that the local temperature is overhigh due to the concentration of fuel gas is avoided, so that the thermal nitrogen oxide is generated due to the reaction.
The angle a between the connecting line of the center of the central gun 27 and the center of the injection hole 272 and the connecting line of the center of the central gun 27 and the center of the outer ring gun 28 is 10-90 degrees.
The head of the outer ring gun 28 extends out of the end of the throat 29, the head of the inner ring gun 27 is positioned in the throat 29, the head of the central gun 24 is positioned in the inner ring gun 27, as shown in fig. 1, the outer ring gun 28, the inner ring gun 27 and the central gun 24 are respectively arranged from left to right, and the front-back axial direction is also divided into 3 sections.
This part is actually the purpose of burner fuel stratification, with 2 benefits: 1. the fuel layering enables the fuel distribution of all parts of the hearth to be basically consistent, the distribution is more uniform, the temperatures of all parts of the hearth are basically consistent, and the generation of high-temperature peak points and the generation of nitrogen oxides are avoided. 2. The fuel can be better and more fully mixed with the wind through the layering, the carbon monoxide emission standard exceeding caused by uneven mixing is reduced, and the efficiency of the combustor is reduced.
Effects and effects of the embodiments
According to the multistage inner loop low-nitrogen gas burner device of this embodiment, because the position differs around the gas air gun is placed, forms layering, segmentation, has solved the problem that the gas is concentrated. The phenomenon that the local temperature is overhigh due to the concentration of fuel gas is avoided, so that the thermal nitrogen oxide is generated due to the reaction.
The multistage internal circulation low-nitrogen gas burner device of this embodiment is direct in the boiler combustion chamber forced circulation with the flue gas, and its aim at preheats the air that natural gas and air-blower come in, makes the burning more stable. The recycled flue gas has relatively lower content of oxygen atoms and nitrogen atoms compared with air, so that the emission of nitrogen oxides is reduced. Compare outside gas circulation and can lead to flue gas cooling to reduce the combustor thermal efficiency, inside gas circulation is bad than outside gas circulation, and the reaction is in the boiler combustion chamber, is favorable to the combustor thermal efficiency more.
In addition, the outer lane rifle burns after make full use of gas mixes with wind and flue gas, and its aim at better messenger is natural mixes with the air, lets the flue gas participate in preheating and makes the burning more steady, avoids mixing the gas that the abundant leads to and remains, can let the natural gas abundant burning not extravagant, improves combustor efficiency, can let the gas burning again not violent, further reduces instantaneous nitrogen oxide.
Furthermore, the central air taking barrel adopts an independent air supply system and does not interfere with external smoke. Compared with the external gas flow, the central gas flow is relatively less, the independent air supply system enables the internal fluid and the external fluid not to interfere with each other, the central structure mode of the independent air supply is unchanged aiming at the condition that the boiler furnace structure is different, and the combustion can be always stable.
Furthermore, the central gun has relatively less gas, the purpose is to prevent oxygen atoms and nitrogen atoms in the air from reacting under the catalysis of the central fire at a higher temperature, the central flame exists to stabilize the whole flame, flameout and shutdown or even danger when the load of the burner is changed due to the formation of a central cavity is prevented, and the problems of central flame stabilization and overhigh central temperature are well solved.
The multistage internal circulation low-nitrogen gas burner device structure mode of this embodiment utilizes inside self-loopa technique of flue gas to make the gas burning in pressure-fired or negative pressure furnace in the outside circulation technique of flue gas relatively, and its structure mode can show improvement flue gas inner loop rate, reduces the combustion-supporting amount of wind, reduces air-blower power, more can effectively avoid the boiler exhaust gas temperature that the outer circulation of flue gas brought to reduce, efficiency descends, the comdenstion water increases, electrical components is fragile, the unstable problem of machine, and then reduce use cost.
In addition, different from the current flame stabilizing mode of flue gas inner circulation on the market, the multistage inner circulation low-nitrogen gas burner device provided by the embodiment reduces nitrogen oxides by using a mature full-diffusion combustion flame stabilizing mode and a fuel gas layering segmentation technology, and simultaneously achieves the purpose of further reducing nitrogen oxides by circulating through the inner flue gas.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (10)
1. The utility model provides a low nitrogen gas burner device of multistage inner loop, installs on the boiler for heat the boiler, its characterized in that includes:
the combustion part comprises a flue gas guide sleeve, an air compression cylinder, a plurality of outer ring gun gas pipes, a central air taking cylinder, a swirler, a central gun, a plurality of primary injection guns, a plurality of secondary injection guns and a throat,
the throat opening is in a cylindrical shape with two open ends, one end of the throat opening is connected with the outer wall of the flue gas guide sleeve through a first connecting piece, the other end of the throat opening is a free end,
the smoke guide cover is in a cone cylinder shape, one end with a small opening is communicated with the air compression cylinder and is positioned at one end of the throat opening and used for returning smoke in the boiler combustion chamber into the throat opening from the included angle of the throat opening and the smoke guide cover,
the central air taking barrel is arranged in the center of the throat opening, the axis of the central air taking barrel is collinear with the axis of the throat opening, one end of the central air taking barrel is connected with the inner wall of the air compression barrel through a second connecting piece, the swirler is arranged at the other end of the central air taking barrel,
the swirler is arranged at the outer side of the central gun, the axis of the central gun is collinear with the axis of the throat, two ends of the central gun are respectively positioned at two sides of the swirler,
the secondary spray guns are uniformly arranged in the throat opening along the circumference and are positioned between the throat opening and the central air taking barrel, the axes of the secondary spray guns are parallel to the axis of the throat opening, the head parts of the secondary spray guns are positioned at the outlet end of the throat opening, and the tail parts of the secondary spray guns are positioned in the throat opening,
the primary spray guns are uniformly arranged in the throat opening along the circumference and are positioned between the throat opening and the central air taking barrel, the primary spray guns are arranged corresponding to the secondary spray guns, and the axes of the primary spray guns are parallel to the axes of the secondary spray guns,
the first-stage spray gun and the second-stage spray gun are both provided with tubular gun heads and gun bodies, the sections of the gun heads are smaller than the sections of the gun bodies,
the secondary spray gun is communicated with the primary spray gun, the gun head of the primary spray gun extends into the tail part of the secondary spray gun,
the outer ring gun gas pipes are arranged corresponding to the primary injection guns, and one end of each outer ring gun gas pipe penetrates through the smoke guide sleeve to be communicated with the primary injection guns in the throat.
2. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, further comprising:
an air intake part, one end of which is communicated with the combustion part,
wherein the other end of the air inlet part is provided with a blast device for blowing air to the air inlet part,
the air inlet part comprises a shell, an air ring piece and an air inlet pipe,
the shell is cylindrical, two ends of the shell are open, one end of the shell is connected and communicated with the smoke guide cover,
the gas ring piece is cylindrical and arranged in the shell, the axis of the gas ring piece is collinear with the axis of the shell, the section of the gas ring piece is a circular ring,
one end of the air inlet pipe is communicated with the air ring piece, the other end of the air inlet pipe is communicated with an external air source, and the axis of the air inlet pipe is perpendicular to the axis of the shell.
3. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 2, wherein:
wherein the cross-sectional area of the housing is: the cross-sectional area of the air compression cylinder is as follows: the cross-sectional area of the central air taking barrel is 2:1.25: 1-8: 2.5: 1.
4. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, wherein:
wherein the ratio of the cross section of the gun body to the cross section of the gun head of the secondary spray gun is 3: 1-6: 1,
the ratio of the cross section of the gun body of the first-stage spray gun to the cross section of the gun head is 1.5: 1-3: 1.
5. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, wherein:
wherein, the distance between the head of the secondary spray gun and the head of the central spray gun is 70 mm-190 mm.
6. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, wherein:
wherein, the ratio of the gun body cross section of the secondary spray gun to the gun body cross section of the primary spray gun is 1.5: 1-2.5: 1 of the total weight of the composition,
the ratio of the cross section of the gun body of the primary injection gun to the cross section of the outer ring gun gas pipe is 1.5: 1-2.5: 1 of the total weight of the composition,
the superposition size of the primary spray gun and the secondary spray gun is-20-60 mm.
7. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, further comprising:
and the axis of the ignition gun is collinear with the axis of the throat, one end of the ignition gun is positioned in the central gun, and the other end of the ignition gun penetrates through the gas ring piece to be communicated with an external gas source.
8. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, wherein:
wherein, a plurality of injection holes are uniformly arranged on the central gun along the circumference,
the included angle between the axis of the injection hole and the axis of the central gun is 0-90 degrees.
9. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, wherein:
wherein the ratio of the sectional area of the throat opening to the sectional area of the central air taking barrel ranges from 1.75:1 to 5: 1.
10. The multi-stage internal circulation low-nitrogen gas burner apparatus as claimed in claim 1, wherein:
wherein the swirler comprises an outer ring, an inner ring and a plurality of vanes,
the thickness of the outer ring is larger than that of the inner ring,
the blades are in a right trapezoid shape, the width of the top edge is the same as the thickness of the inner ring, the width of the bottom edge is the same as the thickness of the outer ring,
the included angle between the plane of the blade and the axis of the inner ring is 7-70 degrees.
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| CN201911221277.6A CN111089289A (en) | 2019-12-03 | 2019-12-03 | Multistage internal circulation low-nitrogen gas burner device |
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| CN201911221277.6A CN111089289A (en) | 2019-12-03 | 2019-12-03 | Multistage internal circulation low-nitrogen gas burner device |
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| CN111609402A (en) * | 2020-05-09 | 2020-09-01 | 北京泷涛环境科技有限公司 | Burner and gas boiler |
| CN112283706A (en) * | 2020-11-20 | 2021-01-29 | 华侨大学 | Multi-gun cyclone type low-nitrogen burner |
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Application publication date: 20200501 |