CN113188121A - Ultralow nitrogen combustor spout, combustor and boiler - Google Patents
Ultralow nitrogen combustor spout, combustor and boiler Download PDFInfo
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- CN113188121A CN113188121A CN202110358523.3A CN202110358523A CN113188121A CN 113188121 A CN113188121 A CN 113188121A CN 202110358523 A CN202110358523 A CN 202110358523A CN 113188121 A CN113188121 A CN 113188121A
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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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- 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 an ultra-low nitrogen burner nozzle, a burner and a boiler, wherein the nozzle comprises a central air duct, a primary air duct is sleeved outside the central air duct, a spiral-flow disc is arranged between the primary air duct and the central air duct and can axially move along with the central air duct, a plurality of primary air natural gas air guns are arranged in the primary air duct, a secondary air duct is sleeved outside the primary air duct, a secondary air pore plate is arranged between the secondary air duct and the primary air duct, a tertiary air duct is sleeved outside the secondary air duct, and a plurality of tertiary air natural gas air guns are arranged on the tertiary air duct. The invention utilizes the cyclone disk to carry out the self-entrainment combustion of the flue gas; multi-layer staged combustion reduction of NO by different natural gas air gunsXGenerating; the secondary air pore plate is utilized to strengthen the air staged combustion, promote the mixing and entrainment of the flue gas, reduce the temperature of combustion flame and further reduceNOXDischarging; the front and back positions of the spiral-flow disk are adjustable, so that the optimal mixing of fuel and air can be ensured, and the generation of combustion pulsation can be avoided by adjusting the position of the spiral-flow disk.
Description
Technical Field
The invention relates to the field of gas boilers, in particular to an ultralow-nitrogen burner nozzle, a burner and a boiler.
Background
Because natural gas has the advantages of high unit calorific value, reliable supply, low price and the like, the natural gas is often used as fuel and has a wider application range. The main component of natural gas is CH4Has higher combustion speed and higher theoretical combustion temperature, and easily causes higher NO during combustionXAnd (5) discharging. Theoretical research shows that NO is controlled after natural gas is combustedXThe key of the emission is to control the high-temperature NOXIs generated. Therefore, the temperature of the natural gas combustion is reduced, the generation of local high-temperature regions is prevented, the residence time of fuel in a temperature range of more than 1500 ℃ is controlled, and NO is added to a natural gas combustorXThe generation of (2) is significant.
The natural gas low-nitrogen combustor used at present mainly takes technologies such as fuel classification, air classification, flue gas recirculation and the like as main technologies, and the structures and parameters proposed by various research institutions have advantages and disadvantages, such as low NO proposed by researchers of Shanghai Hua Pont energy technology Co., LtdXGas burner (patent application publication No. CN102721058A), and "gas burner using low nitrogen oxide and combustion method thereof" (patent application publication No. CN104595900A) proposed by researchers of Shanghai Hanzhao energy science and technology Co., Ltd. For small and medium boilers, the number of burners is small, the fuel staged combustion technology can obtain a more uniform burner outlet temperature field, and the flame peak temperature is reduced, so that lower NO is obtainedXAnd (5) discharging. But for medium and large sized boilersIn particular, in utility boilers, the flame temperature in the central region of the furnace is determined by the combination of a plurality of burners, and it is difficult to control the flame temperature in the central region of the furnace again by the fuel classification technique. The large power station boiler adopts a plurality of burners to organize the combustion in the hearth, the flame in the central area of the hearth is formed by the convergence of a plurality of burners, and the fuel grading technology of the burners generally only has a certain effect on the initial temperature control of the flame of the burners, so that the NO of the large power station boiler is difficult to reduce by adopting the fuel grading burner technologyXAnd (5) discharging. At present, large power station boiler is used for reducing NOXThe emission commonly adopts the flue gas recirculation technology of a whole hearth and the air staged combustion technology, wherein the flue gas recirculation technology reduces NO in natural gas combustionXThe emission effect is most obvious, but the arrangement of a fan, a flue and the like is needed to be added for extracting the flue gas at the tail part of the hearth, the cost is higher, and the NO is carried out along with the arrangement of NOXThe emission index is increasingly strict, the amount of extracted flue gas also needs to be increased, and the operation cost of extracting the flue gas is increased. On one hand, the reliability of equipment such as high-temperature flue gas and fans cannot be effectively guaranteed. On the other hand, in pursuit of NOXThe ultra-low emission, the fuel classification is excessive and the flue gas recirculation quantity is too large, so that the combustion pulsation is caused, and finally, the vibration of a hearth is caused, thereby bringing great operation safety problems.
Disclosure of Invention
The invention aims to: the flame temperature of the central area of the furnace of the medium-large boiler is determined by a plurality of burners together, the high-temperature flue gas of the existing burners is extracted by devices such as a fan, the reliability cannot be effectively guaranteed, in addition, the fuel classification is excessive and the flue gas recirculation amount is too large, the combustion pulsation is caused, the furnace vibration is finally caused, and the problem of great operation safety is brought.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an ultralow nitrogen combustor spout, includes central dryer, central dryer overcoat is equipped with dryer once, dryer once with be equipped with the whirl dish between the dryer in the center, the whirl dish can follow center dryer axial displacement, be equipped with the natural gas air gun of a plurality of once wind in the dryer once, dryer overcoat once is equipped with secondary dryer, secondary dryer with be equipped with the overgrate air orifice board between the dryer once, secondary dryer overcoat is equipped with the tertiary dryer, be equipped with the natural gas air gun of a plurality of tertiary air on the tertiary dryer, the whirl dish is used for the whirl of once wind flue gas, forms central backward flow district, the overgrate air orifice board is used for postponing the mixture of once wind and overgrate air.
By adopting the ultra-low nitrogen burner nozzle, primary air flue gas is swirled by the swirling disc to form a central backflow area, and flue gas self-entrainment combustion is carried out; the primary air natural gas gun and the tertiary air natural gas gun can realize multi-layer staged combustion of fuel, and reduce NO to the maximum extentXGenerating; the secondary air pore plate is utilized to strengthen air staged combustion, promote the mixing and entrainment of secondary air to surrounding smoke, reduce the temperature of combustion flame and further reduce NOXDischarging; meanwhile, the front and back positions of the cyclone disk are adjustable, so that the optimal mixing of fuel and air can be ensured, and the generation of combustion pulsation can be avoided by adjusting the position of the cyclone disk; the ultra-low nitrogen burner nozzle is simple in structure, convenient to use and good in effect.
Preferably, be equipped with apical pore and side opening on the natural gas air gun of a wind, the apical pore with the side opening all is used for spraying the natural gas, the apical pore orientation the export of dryer once, the side opening orientation in the dryer once.
By adopting the structure, partial fuel gas in the primary air natural gas gun passes through the side hole is sprayed into the entrainment mixing area of the primary air flue gas, the advanced premixing of the root fuel gas is formed, the stable combustion of the root of the combustor is promoted, and the other part of fuel gas passes through the entrainment mixing area of the secondary air and the flue gas sprayed into the top hole, so that the low-temperature combustion of the fuel gas is realized under low oxygen.
Further preferably, a stopper is arranged on the primary air natural gas gun and is positioned in front of the side hole.
By adopting the structure, the stop block is used for shielding the wind for the side holes in the primary air duct, so that stable ignition and combustion of the gas of the side holes are ensured.
Further preferably, the included angle between the spraying direction of the top hole and the axial direction of the central air duct is alpha, the alpha is 5-45 degrees, and the spraying direction of the top hole is far away from the central air duct.
Preferably, the primary air natural gas air gun comprises 3-8 primary air natural gas air guns which are uniformly distributed on the primary air barrel ring.
Preferably, the included angle between the spraying direction of the tertiary air natural gas air gun and the axial direction of the central air cylinder is beta, the beta is 5-45 degrees, the spraying direction of the tertiary air natural gas air gun is far away from the central air cylinder, and the beta values of two adjacent tertiary air natural gas air guns are different.
By adopting the structure, the tertiary air natural gas gun is injected into the hearth at different beta angles, so that the multi-layer staged combustion of fuel is realized, and the NO is reduced to the maximum extentXAnd (4) generating.
Preferably, the tertiary air natural gas air gun comprises 8-20 tertiary air natural gas air guns which are uniformly distributed on the tertiary air cylinder ring.
The invention also provides an ultra-low nitrogen burner, which comprises the ultra-low nitrogen burner nozzle as described in any one of the above items, and further comprises:
the central air assembly comprises a central air adjusting air door and the central air duct, and the central air adjusting air door is used for adjusting the air quantity of the central air;
the primary air assembly is sleeved outside the central air assembly and comprises a primary air adjusting device, a primary air duct and the cyclone disc, and a primary air inlet is formed in the wall of the primary air duct;
the secondary air assembly is sleeved outside the primary air assembly and comprises the secondary air duct and the secondary air pore plate;
the tertiary air assembly is sleeved outside the secondary air assembly and comprises a tertiary air radial adjusting device, a Venturi type expanding cone and the tertiary air cylinder, the tertiary air radial adjusting device is arranged at the inlet of the tertiary air cylinder and used for rotating the air passing through the tertiary air radial adjusting device, and the Venturi type expanding cone is arranged in the tertiary air cylinder and positioned behind the tertiary air radial adjusting device and used for rectifying and enabling the airflow at the tertiary air outlet to be more uniform;
the natural gas spray gun comprises the primary air natural gas gun and the tertiary air natural gas gun;
the natural gas distribution ring comprises a primary air gun distribution ring and a tertiary air gun distribution ring, wherein the primary air gun distribution ring is used for supplying air to the primary air natural gas gun, and the tertiary air gun distribution ring is used for supplying air to the tertiary air natural gas gun;
the central air duct is connected with the cyclone disk, and the front and rear positions of the central air duct can be adjusted to be in the front and rear positions of the primary air duct.
By adopting the ultra-low nitrogen burner, the central air assembly is used for supplying air at the initial ignition stage, and the ignition point can be controlled by adjusting the central air adjusting air door so as to adjust the position of the central reflux area; the requirement of the initial combustion stage is met by selecting proper primary air speed and primary air rate, the swirl disk arranged at the front end of the primary air barrel can form a central backflow area for stably burning the entrainment flue gas, and the position of the swirl disk can be adjusted forwards and backwards, so that the optimal mixing of fuel and air can be ensured, and the generation of combustion pulsation can be avoided by adjusting the position of the swirl disk; the secondary air pore plate can delay the mixing of primary air and secondary air on one hand, further strengthen air staged combustion, and on the other hand, the secondary air pore plate can promote the mixing and entrainment of secondary air to surrounding smoke, so that the combustion flame temperature can be reduced, and NO is further reducedXDischarging; the wind passes through tertiary air radial adjusting device produces the rotation after, expands all around after leaving the combustor spout, forms a negative pressure region in center department to make the high temperature flue gas backward flow so far, the high temperature flue gas of backward flow can provide sufficient heat and make the fuel stably catch fire, in the tertiary dryer venturi type expands the awl and can play the effect of rectification, makes tertiary air export air current more even, avoids appearing local high temperature burning, finally realizes that the tertiary air exports the air current more evenlyLow NOXCombustion, the air volume of tertiary air and the rotational flow strength thereof can be adjusted by adjusting a tertiary air door, so that the optimal combustion working condition is obtained; the burner has the advantages of simple structure, convenient use and good effect.
Preferably, the ultra-low nitrogen burner further comprises a position adjusting device, wherein the position adjusting device is connected to the gas distribution ring of the primary air gun and is used for adjusting the front and back positions of the primary air natural gas gun in the primary air cylinder.
Preferably, an ignition air gun is arranged in the central air duct and is used for initial ignition.
Preferably, the primary air inlet adopts a wedge-shaped air inlet mode, so that the air quantity can be adjusted more sensitively.
The invention also provides a boiler which comprises the ultralow nitrogen burner as defined in any one of the above, wherein the ultralow nitrogen burner comprises a fixed casing, the fixed casing is connected to the tertiary air duct outside the nozzle of the ultralow nitrogen burner, and the fixed casing is connected with the water-cooled wall of the boiler in a sealing manner.
The boiler has the flue gas self-entrainment combustion technology, and combines the fuel multilayer graded combustion technology and the combustor air deep graded combustion technology to obtain lower combustion temperature in the boiler; the combination of these combustion techniques may substantially reduce the flame front temperature of the combustion, thereby reducing the NO of the boilerXDischarging; through a large amount of analysis and calculation, the NO of the novel burner is more than that of a common natural gas burnerXThe emission can be reduced by more than 60%.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the ultra-low nitrogen burner nozzle, primary air flue gas is swirled by the swirling disc to form a central backflow area, and flue gas self-entrainment combustion is carried out; the primary air natural gas gun and the tertiary air natural gas gun can realize multi-layer staged combustion of fuel, and reduce NO to the maximum extentXGenerating; utilize the overgrate air orifice plate to strengthen the air staged combustion, and promote the overgrate air to the surrounding flue gasMixing and entrainment, lowering combustion flame temperature, further reducing NOXDischarging; meanwhile, the front and back positions of the cyclone disk are adjustable, so that the optimal mixing of fuel and air can be ensured, and the generation of combustion pulsation can be avoided by adjusting the position of the cyclone disk; the ultra-low nitrogen burner nozzle has the advantages of simple structure, convenient use and good effect;
2. according to the ultra-low nitrogen burner nozzle, part of gas in the primary air natural gas gun is sprayed into an entrainment mixing area of primary air flue gas through the side hole to form advanced premixing of the root gas and promote stable combustion of the root of the burner, and the other part of gas is sprayed into an entrainment mixing area of secondary air and flue gas through the top hole to realize low-temperature combustion of the gas under low oxygen;
3. according to the ultra-low nitrogen burner nozzle, the baffle block is used for shielding wind for the side hole in the primary air duct, so that stable ignition and combustion of fuel gas of the side hole are ensured;
4. according to the nozzle of the ultra-low nitrogen burner, the tertiary air natural gas gun is sprayed into a hearth at different beta angles, so that multi-layer staged combustion of fuel is realized, and NO is reduced to the maximum extentXGenerating;
5, the central air assembly is used for supplying air at the initial stage of ignition, and the ignition point can be controlled by adjusting the central air adjusting air door so as to adjust the position of the central reflux area; the requirement of the initial combustion stage is met by selecting proper primary air speed and primary air rate, the swirl disk arranged at the front end of the primary air barrel can form a central backflow area for stably burning the entrainment flue gas, and the position of the swirl disk can be adjusted forwards and backwards, so that the optimal mixing of fuel and air can be ensured, and the generation of combustion pulsation can be avoided by adjusting the position of the swirl disk; the secondary air pore plate can delay the mixing of primary air and secondary air on one hand, further strengthen air staged combustion, and on the other hand, the secondary air pore plate can promote the mixing and entrainment of secondary air to surrounding smoke, so that the combustion flame temperature can be reduced, and NO is further reducedXDischarging; wind ventilation deviceAfter the radial adjusting device for tertiary air rotates, the tertiary air expands around after leaving a nozzle of the burner, a negative pressure area is formed at the center, so that high-temperature flue gas flows back, the returned high-temperature flue gas can provide enough heat to enable fuel to be stably ignited, the venturi type expansion cone in the tertiary air cylinder can play a role in rectification, airflow at the outlet of the tertiary air is more uniform, local high-temperature combustion is avoided, and finally low NO is realizedXCombustion, the air volume of tertiary air and the rotational flow strength thereof can be adjusted by adjusting a tertiary air door, so that the optimal combustion working condition is obtained; the burner has simple structure, convenient use and good effect;
6. the boiler has a flue gas self-entrainment combustion technology, and combines a fuel multilayer graded combustion technology and a combustor air deep graded combustion technology to obtain lower combustion temperature in the boiler; the combination of these combustion techniques may substantially reduce the flame front temperature of the combustion, thereby reducing the NO of the boilerXDischarging; through a large amount of analysis and calculation, the NO of the novel burner is more than that of a common natural gas burnerXThe emission can be reduced by more than 60%.
Drawings
FIG. 1 is a schematic structural view of an ultra-low nitrogen burner port according to the present invention;
FIG. 2 is a schematic structural view of an ultra-low nitrogen burner according to the present invention;
FIG. 3 is a schematic view of the primary air natural gas gun of the present invention;
fig. 4 is a schematic structural view of the tertiary air natural gas gun of the present invention.
The labels in the figure are: 1-central air assembly, 10-central air cylinder, 2-primary air assembly, 20-primary air cylinder, 21-cyclone disk, 22-primary air natural gas air gun, 221-top hole, 222-side hole, 223-stop block, 23-primary air adjusting device, 24-primary air inlet, 3-secondary air assembly, 30-secondary air cylinder, 31-secondary air pore plate, 4-tertiary air assembly, 40-tertiary air cylinder, 41-tertiary air natural gas air gun, 42-tertiary air radial adjusting device, 43-venturi type expanding cone, 5-primary air gun air distribution ring, 6-tertiary air gun air distribution ring, 7-position adjusting device and 8-fixed housing.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1 to 4, the ultra-low nitrogen burner nozzle of the present invention comprises a central air duct 10, a primary air duct 20, a secondary air duct 30 and a tertiary air duct 40.
The central dryer 10 overcoat is established dryer 20 once, dryer 20 once with be equipped with whirl dish 21 between the dryer 10 in the center, whirl dish 21 can follow 10 axial displacement in the dryer in the center, whirl dish 21 is used for the cyclone of a wind flue gas, forms central backward flow district.
A plurality of primary air natural gas guns 22 are arranged in the primary air duct 20, a top hole 221 and two side holes 222 which are arranged at intervals are arranged on each primary air natural gas gun 22, and the flow of the primary air natural gas gun 22 nozzle accounts for 5% -30% of the total gas quantity; the top hole 221 and the side holes 222 are used for injecting natural gas, the top hole 221 faces the outlet of the primary air duct 20, the side holes 222 face the inside of the primary air duct 20, a stopper 223 is arranged on the primary air natural gas air gun 22, and the stopper 223 is positioned in front of the side holes 222; the ejection direction of the top hole 221 and the axial included angle of the central wind tube 10 are α, α is 5 ° to 45 °, the ejection direction of the top hole 221 is far away from the central wind tube 10, and in this embodiment, α is specifically 30 °; the primary air natural gas air gun 22 comprises 3-8 primary air guns and is uniformly distributed on the primary air duct 20 ring, and the primary air natural gas air gun 22 is specifically 3 primary air guns in the embodiment.
The secondary air duct 30 is sleeved outside the primary air duct 20, a secondary air pore plate 31 is arranged between the secondary air duct 30 and the primary air duct 20, and the secondary air pore plate 31 is used for delaying the mixing of primary air and secondary air.
The secondary air duct 30 is sleeved with the tertiary air duct 40, the tertiary air duct 40 is provided with a plurality of tertiary air natural gas air guns 41, the injection directions of the tertiary air natural gas air guns 41 and the axial included angle of the central air duct 10 are beta, the beta is 5-45 degrees, the injection directions of the tertiary air natural gas air guns 41 are far away from the central air duct 10, the beta values of two adjacent tertiary air natural gas air guns 41 are different, specifically, in the embodiment, one beta of each two adjacent tertiary air natural gas air guns 41 is 10 degrees, the other beta of each two adjacent tertiary air natural gas air guns 41 is 15 degrees, and thus the tertiary air natural gas air guns are injected into a hearth at different angles, so that the multilayer staged combustion of fuel is realized; the tertiary air natural gas air guns 41 comprise 8-20 air guns evenly distributed on the ring of the tertiary air duct 40, and in this embodiment, the tertiary air natural gas air guns 41 specifically comprise 18 air guns.
According to the ultra-low nitrogen burner nozzle, primary air flue gas is swirled by the swirling disc 21 to form a central backflow area, and flue gas self-entrainment combustion is carried out; the primary air natural gas gun 22 and the tertiary air natural gas gun 41 can realize multi-layer staged combustion of fuel, and the NO is reduced to the maximum extentXGenerating; the secondary air pore plate 31 is utilized to strengthen air staged combustion, promote the mixing and entrainment of secondary air to surrounding smoke, reduce the temperature of combustion flame and further reduce NOXDischarging; meanwhile, the front and back positions of the cyclone disk 21 are adjustable, so that not only can the optimal mixing of fuel and air be ensured, but also the combustion pulsation phenomenon can be avoided by adjusting the position of the cyclone disk; part of the gas in the primary air natural gas gun 22 is injected into the entrainment mixing area of the primary air flue gas through the side holes 222 to form advanced premixing of the root gas, so that the stable combustion of the root of the combustor is promoted, and the other part of the gas is injected into the entrainment mixing area of the secondary air and the flue gas at an angle alpha through the top holes 221, so that the low-temperature combustion of the gas is realized under low oxygen; the stopper 223 is used for shielding wind for the side hole 222 in the primary air duct 20, so as to ensure stable ignition and combustion of the gas in the side hole 222; the tertiary air natural gas gun 41 injects fuel into the hearth at different beta angles to realize multi-layer staged combustion of the fuel and reduce NO to the maximum extentXGenerating;the ultra-low nitrogen burner nozzle is simple in structure, convenient to use and good in effect.
Example 2
As shown in fig. 1 to 4, an ultra-low nitrogen burner according to the present invention includes the ultra-low nitrogen burner nozzle according to embodiment 1, and further includes:
the central air assembly 1 comprises a central air adjusting air door and the central air duct 10, wherein the central air adjusting air door is used for adjusting the air quantity of the central air, and an ignition air gun is arranged in the central air duct 10 and is used for initial ignition;
the primary air assembly 2 is sleeved outside the central air assembly 1, the primary air assembly 2 comprises a primary air adjusting device 23, the primary air duct 20 and the cyclone disc 21, a primary air inlet 24 is formed in the wall of the primary air duct 20, the front and rear positions of the primary air natural gas gun 22 in the primary air duct 20 can be adjusted, and the primary air inlet 24 adopts a wedge-shaped air inlet mode, so that the air volume can be adjusted more sensitively;
the secondary air assembly 3 is sleeved outside the primary air assembly 2, and the secondary air assembly 3 comprises the secondary air duct 30 and the secondary air pore plate 31;
the tertiary air assembly 4 is sleeved outside the secondary air assembly 3, the tertiary air assembly 4 comprises a tertiary air radial adjusting device 42, a venturi-type expanding cone 43 and the tertiary air duct 40, the tertiary air radial adjusting device 42 is arranged at the inlet of the tertiary air duct 40 and used for rotating the air passing through the tertiary air radial adjusting device 42, and the venturi-type expanding cone 43 is arranged in the tertiary air duct 40 and behind the tertiary air radial adjusting device 42 and used for rectifying and enabling the airflow at the tertiary air outlet to be more uniform;
a natural gas lance comprising the primary air natural gas gun 22 and the tertiary air natural gas gun 41;
the natural gas distribution ring comprises a primary air gun distribution ring 5 and a tertiary air gun distribution ring 6, wherein the primary air gun distribution ring 5 is used for supplying air to the primary air natural gas gun 22, and the tertiary air gun distribution ring 6 is used for supplying air to the tertiary air natural gas gun 41;
the position adjusting device 7 is connected to the primary air gun air distribution ring 5, and the position adjusting device 7 is used for adjusting the front and back positions of the primary air natural gas gun 22 in the primary air duct 20;
wherein, central dryer 10 connect in whirl dish 21, adjust the fore-and-aft position of central dryer 10 can adjust whirl dish 21 is in the fore-and-aft position in primary dryer 20.
According to the ultra-low nitrogen burner, the central air assembly 1 is used for supplying air at the initial stage of ignition, and the ignition point can be controlled by adjusting the central air adjusting air door so as to adjust the position of a central reflux area; the requirement of the initial combustion stage is met by selecting proper primary air speed and primary air rate, the cyclone disk 21 arranged at the front end of the primary air duct 20 can form a central backflow area for stably burning the entrainment flue gas, and the position of the cyclone disk 21 can be adjusted forwards and backwards, so that the optimal mixing of fuel and air can be ensured, and the generation of combustion pulsation can be avoided by adjusting the position of the cyclone disk 21; the secondary air pore plate 31 can delay the mixing of primary air and secondary air on one hand, further strengthen air staged combustion, and on the other hand, the secondary air pore plate 31 can promote the mixing and entrainment of secondary air to surrounding flue gas, so that the combustion flame temperature can be reduced, and NO is further reducedXDischarging; the wind passes through the tertiary air radial adjusting device 42 and then rotates, expands around after leaving the nozzle of the burner, and forms a negative pressure area at the center, so that the high-temperature flue gas flows back to the center, the high-temperature flue gas flowing back can provide enough heat to enable the fuel to be stably ignited, the Venturi type expansion cone 43 in the tertiary air cylinder 40 can play a role of rectification, the tertiary air outlet airflow is more uniform, the local high-temperature combustion is avoided, and finally the low NO is realizedXCombustion, the air volume of tertiary air and the rotational flow strength thereof can be adjusted by adjusting a tertiary air door, so that the optimal combustion working condition is obtained; the burner has the advantages of simple structure, convenient use and good effect.
Example 3
As shown in fig. 1 to 4, the boiler of the present invention comprises the ultra-low nitrogen burner according to embodiment 2, wherein the ultra-low nitrogen burner comprises a fixed casing 8, the fixed casing 8 is connected to the tertiary air duct 40 outside the ultra-low nitrogen burner nozzle, and the fixed casing 8 is connected with the boiler water wall in a sealing manner.
The boiler has a flue gas self-entrainment combustion technology, and combines a fuel multilayer graded combustion technology and a combustor air deep graded combustion technology to obtain lower combustion temperature in the boiler; the combination of these combustion techniques may substantially reduce the flame front temperature of the combustion, thereby reducing the NO of the boilerXDischarging; through a large amount of analysis and calculation, the NO of the novel burner is more than that of a common natural gas burnerXThe emission can be reduced by more than 60%.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The ultra-low nitrogen burner nozzle comprises a central wind cylinder (10) and is characterized in that a primary wind cylinder (20) is sleeved outside the central wind cylinder (10), a cyclone disc (21) is arranged between the primary wind cylinder (20) and the central wind cylinder (10), the cyclone disc (21) can move along with the central wind cylinder (10) in the axial direction, a plurality of primary natural gas air guns (22) are arranged in the primary wind cylinder (20), a secondary wind cylinder (30) is sleeved outside the primary wind cylinder (20), a secondary air hole plate (31) is arranged between the secondary wind cylinder (30) and the primary wind cylinder (20), a tertiary wind cylinder (40) is sleeved outside the secondary wind cylinder (30), a plurality of tertiary natural gas air guns (41) are arranged on the tertiary wind cylinder (40), and the cyclone disc (21) is used for swirling primary natural gas air to form a central backflow area, the secondary air pore plate (31) is used for delaying the mixing of primary air and secondary air.
2. The ultra-low nitrogen burner jet according to claim 1, characterized in that the primary wind natural gas air lance (22) is provided with a top hole (221) and a side hole (222), both the top hole (221) and the side hole (222) being used for injecting natural gas, the top hole (221) being directed towards the primary drum (20) outlet, the side hole (222) being directed into the primary drum (20).
3. The ultra-low nitrogen burner jet of claim 2, wherein the primary air natural gas gun (22) is provided with a stop (223), the stop (223) being located forward of the side hole (222).
4. An ultra-low nitrogen burner jet according to claim 2, characterized in that the ejection direction of the top hole (221) is at an angle α of 5 ° -45 ° to the axial direction of the central wind tunnel (10), the ejection direction of the top hole (221) being away from the central wind tunnel (10).
5. The ultra-low nitrogen burner jet of claim 1, characterized in that the primary air natural gas lances (22) comprise 3-8 and are evenly distributed on the primary air duct (20) ring.
6. The ultra-low nitrogen burner nozzle according to claim 1, characterized in that the jet direction of the tertiary air natural gas air gun (41) and the axial direction of the central air duct (10) form an included angle β, β is 5 ° -45 °, the jet direction of the tertiary air natural gas air gun (41) is far away from the central air duct (10), and the β values of two adjacent tertiary air natural gas air guns (41) are different.
7. The ultra low nitrogen burner port according to any one of claims 1 to 6, wherein the tertiary air natural gas air lances (41) comprise 8 to 20 and are evenly distributed on the tertiary air duct (40) ring.
8. An ultra-low nitrogen burner comprising the ultra-low nitrogen burner nozzle of any one of claims 1 to 7, further comprising:
the central air assembly (1) comprises a central air adjusting air door and the central air duct (10), and the central air adjusting air door is used for adjusting the air quantity of central air;
the primary air assembly (2) is sleeved outside the central air assembly (1), the primary air assembly (2) comprises a primary air adjusting device (23), the primary air duct (20) and the cyclone disc (21), and a primary air inlet (24) is formed in the wall of the primary air duct (20);
the secondary air assembly (3) is sleeved outside the primary air assembly (2), and the secondary air assembly (3) comprises a secondary air duct (30) and a secondary air pore plate (31);
the tertiary air assembly (4) is sleeved outside the secondary air assembly (3), the tertiary air assembly (4) comprises a tertiary air radial adjusting device (42), a Venturi type expanding cone (43) and the tertiary air cylinder (40), the tertiary air radial adjusting device (42) is arranged at the inlet of the tertiary air cylinder (40) and used for rotating the air passing through the tertiary air radial adjusting device (42), and the Venturi type expanding cone (43) is arranged in the tertiary air cylinder (40) and behind the tertiary air radial adjusting device (42) and used for rectifying and enabling the airflow at the tertiary air outlet to be more uniform;
a natural gas lance comprising the primary air natural gas gun (22) and the tertiary air natural gas gun (41);
the natural gas distribution ring comprises a primary air gun distribution ring (5) and a tertiary air gun distribution ring (6), wherein the primary air gun distribution ring (5) is used for supplying air to the primary air natural gas gun (22), and the tertiary air gun distribution ring (6) is used for supplying air to the tertiary air natural gas gun (41);
wherein, central dryer (10) connect in whirl dish (21), adjust the front and back position of central dryer (10) can be adjusted whirl dish (21) are in the front and back position in primary dryer (20).
9. The ultra-low nitrogen burner as claimed in claim 8, further comprising a position adjusting device (7), wherein the position adjusting device (7) is connected to the primary air gun distribution ring (5), and the position adjusting device (7) is used for adjusting the front-back position of the primary air natural gas gun (22) in the primary air duct (20).
10. A boiler, characterized in that it comprises an ultra-low nitrogen burner as claimed in any one of claims 8 to 9, said ultra-low nitrogen burner comprising a fixed casing (8), said fixed casing (8) being connected to said tertiary air duct (40) outside the ultra-low nitrogen burner ports, said fixed casing (8) being sealingly connected to the boiler water wall.
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| CN202110358523.3A CN113188121B (en) | 2021-04-01 | 2021-04-01 | Ultralow nitrogen combustor spout, combustor and boiler |
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| CN202110358523.3A CN113188121B (en) | 2021-04-01 | 2021-04-01 | Ultralow nitrogen combustor spout, combustor and boiler |
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| CN113188121A true CN113188121A (en) | 2021-07-30 |
| CN113188121B CN113188121B (en) | 2022-11-04 |
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| CN116379431A (en) * | 2023-03-30 | 2023-07-04 | 武汉明正动力工程有限公司 | Four-in-one low-nitrogen combustor |
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| CN113188121B (en) | 2022-11-04 |
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