CN116293679A - Low-oxygen dilution combustion hydrogen-doped low-nitrogen combustor - Google Patents
Low-oxygen dilution combustion hydrogen-doped low-nitrogen combustor Download PDFInfo
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- CN116293679A CN116293679A CN202310255435.XA CN202310255435A CN116293679A CN 116293679 A CN116293679 A CN 116293679A CN 202310255435 A CN202310255435 A CN 202310255435A CN 116293679 A CN116293679 A CN 116293679A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 69
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000001301 oxygen Substances 0.000 title claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 24
- 238000010790 dilution Methods 0.000 title claims description 23
- 239000012895 dilution Substances 0.000 title claims description 23
- 239000007789 gas Substances 0.000 claims abstract description 161
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 51
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000001257 hydrogen Substances 0.000 claims abstract description 37
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 34
- 239000007921 spray Substances 0.000 claims abstract description 29
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 18
- 230000001133 acceleration Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 206010021143 Hypoxia Diseases 0.000 abstract description 4
- 230000007954 hypoxia Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- 239000000779 smoke Substances 0.000 description 7
- 239000002737 fuel gas Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/70—Baffles or like flow-disturbing devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- 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
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/76—Protecting flame and burner parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/007—Mixing tubes, air supply regulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to the technical field of combustors, and discloses a low-oxygen diluted combustion hydrogen-doped low-nitrogen combustor which comprises a mixed gas ring cavity and a combustion head outer cover, wherein one end of the combustion head outer cover, which is far away from the mixed gas ring cavity, is provided with an outer flame stabilizing disc and a central flame stabilizing disc; the outer side of the mixed gas ring cavity is connected with a main gas inlet pipe; the outer side of the main gas inlet pipe is coaxially provided with a hydrogen ring cavity, the inner side of the main gas inlet pipe is provided with a plurality of mixing pipes, and the outer side of the hydrogen ring cavity is provided with a hydrogen inlet pipe; a plurality of mixed gas secondary pipes are arranged on one side of the mixed gas ring cavity, which is close to the outer cover of the combustion head; the inner sides of the mixed gas ring cavity and the combustion head outer cover are also provided with a mixed gas central pipe, and one end of the mixed gas central pipe is provided with a plurality of central mixed gas primary spray pipes; a plurality of central mixed gas secondary spray pipes are uniformly distributed on the outer side; an air accelerating section, an air rectifying section and a porous blunt body are arranged on the outer side of the mixed gas central tube. The invention strengthens the hypoxia effect, avoids local high temperature, reduces thermal type and rapid NOx generation.
Description
Technical Field
The invention belongs to the technical field of combustors, and particularly relates to a low-oxygen dilution combustion hydrogen-doped low-nitrogen combustor.
Background
In the present day that the traditional fossil fuels such as coal, petroleum, natural gas and the like bring a plurality of problems such as environmental pollution, greenhouse effect and the like to human beings, the hydrogen energy has a particularly important practical significance as clean renewable energy.
Compared with other fuels, the hydrogen combustion has the characteristics of high theoretical combustion temperature (about 2050 ℃), wide explosion limit (4% -75.6%), high combustion speed (about 10 times of the methane combustion speed), cleanness, regeneration and no carbon emission, and the hydrogen doping in the fuel is beneficial to improving the ignition condition and reducing the carbon emission, and the existing burner can not meet the hydrogen doping combustion requirement in a targeted way. Therefore, a burner needs to be developed aiming at the characteristics of the combustible mixed gas after hydrogen addition, combustion is reasonably organized, and NOx emission is reduced.
On the premise that a pipeline system accords with the combustible gas transportation standard, designing a combustor which controls the chemical reaction rate and the generation of NOx and ensures the full combustion of the hydrogen-doped fuel is a problem to be solved in front of technical staff.
Disclosure of Invention
The purpose of the invention is that: aims at providing a low-oxygen dilution combustion hydrogen-doped low-nitrogen burner which is used for solving the problems of high combustion temperature, high NOx emission, easy tempering and the like of the hydrogen-doped burner in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the utility model provides a low oxygen dilution combustion's low nitrogen combustor of hydrogen that mixes, includes mixing gaseous ring chamber and combustion head dustcoat, mixing gaseous ring chamber and the coaxial setting of combustion head dustcoat:
an outer flame stabilizing disc and a central flame stabilizing disc are sequentially arranged at one end, far away from the mixed gas ring cavity, of the outer cover of the combustion head from outside to inside; a central flame protection cylinder is arranged between the outer flame stabilizing disc and the central flame stabilizing disc; the outer side of the mixed gas ring cavity is connected with a main gas inlet pipe; the outer side of the main gas inlet pipe is coaxially provided with a hydrogen ring cavity, the inner side of the main gas inlet pipe is provided with a plurality of mixing pipes communicated with the hydrogen ring cavity, and the outer side of the hydrogen ring cavity is provided with a hydrogen inlet pipe; a plurality of mixed gas secondary pipes are arranged on one side of the mixed gas ring cavity, which is close to the outer cover of the combustion head; one end of each of the plurality of mixed gas secondary pipes is communicated with the mixed gas ring cavity, and the other end of each of the plurality of mixed gas secondary pipes is provided with a plurality of mixed gas holes; the inner sides of the mixed gas ring cavity and the combustion head outer cover are also provided with a mixed gas central pipe, one end of the mixed gas central pipe is communicated with the mixed gas ring cavity, and the other end of the mixed gas central pipe is provided with a plurality of central mixed gas primary spray pipes; a plurality of central mixed gas secondary spray pipes are uniformly distributed on the outer side of the mixed gas central pipe; one end of the central mixed gas primary spray pipe and one end of the central mixed gas secondary spray pipe are communicated with the mixed gas central pipe, and the other end of the central mixed gas primary spray pipe and the other end of the central mixed gas secondary spray pipe penetrate through the central flame stabilizing disc; the outside of the mixed gas central tube is provided with an air accelerating section, an air rectifying section and a porous blunt body in sequence from the mixed gas ring cavity to the direction of the outer cover of the combustion head.
Further, the air accelerating section is a contracted cylinder; the aperture of the air acceleration section close to one end of the mixed gas ring cavity is larger than the aperture of the air acceleration section far away from one end of the mixed gas ring cavity; the air rectifying section is a cylinder with the same aperture size at two ends; the porous blunt body is an enlarged cylinder, the aperture of one end of the porous blunt body, which is close to the gas mixing ring cavity, is smaller than the aperture of one end, which is far away from the gas mixing ring cavity, and a plurality of through holes are uniformly formed in the surface of the porous blunt body.
Further, the mixing pipes are arranged in parallel, and two ends of each mixing pipe are respectively communicated with the inner wall of the mixing gas ring cavity; the surface of the mixing tube is uniformly provided with a plurality of hydrogen holes.
Further, one end of the gas mixture secondary pipe, which is close to the outer flame stabilizing disc, is sealed, and the gas mixture holes are uniformly distributed at the position, which is close to the outer flame stabilizing disc, of the outer side of the gas mixture secondary pipe.
Further, the diameter of the outer flame stabilizing disc is larger than the aperture of the outer cover of the combustion head.
Further, the central flame stabilizing disc is of a porous and slotted hole composite structure.
Further, a plurality of rectifying plates are arranged on the outer side of the central fire protection cylinder; the rectifying plate is a steel rectifying plate.
Further, the number of the central mixed gas primary spray pipes is 8-12; the number of the secondary spray pipes of the central mixed gas is 8-12.
Further, the air flow velocity in the air rectifying section is 50-80m/s.
Further, the notch angle of the central flame stabilizing disc and the outer flame stabilizing disc is 0-45 degrees.
The invention adopting the technical scheme has the following advantages:
(1) The hypoxia effect is enhanced, and the internal smoke circulation rate Kv (internal smoke mass flow/combustion air mass flow) of the hearth can reach 0.3-0.45. The oxygen content of the air can be reduced to 15.6%, and the chemical reaction process, the distribution of the temperature field in the hearth and the generation of thermal NOx can be effectively controlled;
(2) The internal flow field of the burner is adjusted through the porous blunt body, so that the central flame air excess coefficient is 1.3, and the total air excess coefficient is 1.1;
(3) The central flame is further divided by the central mixed gas primary spray pipe, the central mixed gas secondary spray pipe and the central flame stabilizing disc to form micro flame, the chemical reaction is completed rapidly under the condition of designed equivalence ratio, and the flame temperature is reduced.
(4) And the micro-premixing small flame combustion is formed through the gas mixture secondary pipe and the outer flame stabilizing disc, the deviation of the reaction equivalent ratio from the design value is restrained, the local high temperature is avoided, and the thermal type and rapid NOx generation is reduced.
(5) Through the structure between the outer flame stabilizing disc and the combustion head outer cover, the flame structure has certain pulling up in the radial direction, so that the heat exchange efficiency of the burner end is improved, and the energy efficiency is improved.
Drawings
The invention can be further illustrated by means of non-limiting examples given in the accompanying drawings;
FIG. 1 is a front view of a low oxygen dilution combustion hydrogen-loaded low nitrogen burner of the present invention;
FIG. 2 is a perspective view of a low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with the present invention;
FIG. 3 is a partial block diagram of a central flame holder in a low oxygen dilution combustion hydrogen-loaded low nitrogen burner of the present invention;
FIG. 4 is a partial block diagram of a main gas inlet pipe of the low-oxygen dilution combustion hydrogen-doped low-nitrogen burner of the invention;
FIG. 5 is a partial block diagram of the air acceleration section, air rectifying section and porous bluff body of a low oxygen dilution combustion hydrogen-loaded low nitrogen burner of the present invention.
The main reference numerals are as follows:
a main gas inlet pipe 1; a hydrogen intake pipe 2; a hydrogen ring chamber 3; a mixing tube 4; a mixing gas ring cavity 5; an air passage 6; a gas mixture center pipe 7; an air acceleration section 8; an air rectifying section 9; a porous blunt body 10; a mixture secondary pipe 11; a burner head housing 12; an outer flame stabilizing plate 13; a central fire protection barrel 14; a central gas mixture primary nozzle 15; a central flame stabilizing plate 16; a central gas mixture secondary nozzle 17; and a rectifying plate 18.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments, wherein like or similar parts are designated by the same reference numerals throughout the drawings or the description, and implementations not shown or described in the drawings are in a form well known to those of ordinary skill in the art. In addition, directional terms such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", etc. in the embodiments are merely directions with reference to the drawings, and are not intended to limit the scope of the present invention.
1-5, the low-oxygen dilution combustion hydrogen-doped low-nitrogen combustor comprises a mixed gas ring cavity 5 and a combustion head outer cover 12, wherein the mixed gas ring cavity 5 and the combustion head outer cover 12 are coaxially arranged in a separated mode, the maximum aperture of the mixed gas ring cavity 5 is consistent with the aperture of the combustion head outer cover 12, meanwhile, a gap exists between the mixed gas ring cavity 5 and the combustion head outer cover 12, and a large negative pressure is generated near the gap; the flue gas in the hearth is sucked into the burner by a gap between the mixed gas ring cavity 5 and the burner head outer cover 12 under the action of negative pressure and is mixed with combustion air; an air channel 6 is formed between the inner walls of the mixing gas ring cavity 5 for air circulation;
the outer cover 12 of the combustion head is far away from one end of the mixed gas ring cavity 5, and an outer flame stabilizing disc 13 and a central flame stabilizing disc 16 are sequentially arranged from outside to inside; the outer flame stabilizing disc 13 and the central flame stabilizing disc 16 are positioned on the same horizontal plane and are adjacent to each other; the outer flame stabilizing disc 13 and the central flame stabilizing disc 16 divide the central flame further to form micro flame, chemical reaction is completed rapidly under the condition of partial equivalent ratio, flame temperature is reduced, and the effect of stabilizing flame is achieved through circumfluence and backflow; a central flame protection cylinder 14 is arranged between the outer flame stabilizing disc 13 and the central flame stabilizing disc 16; the central flame protecting cylinder 14 is a hollow cylinder, and the central flame stabilizing disk 16 is enclosed in the cylinder; the central flame protection cylinder 14 is a central flame stabilizer, and keeps the central flame stable and burns through the vortex flame stabilization of the smoke;
the outer side of the mixed gas ring cavity 5 is connected with a main gas inlet pipe 1; one end of the main gas inlet pipe 1 is communicated with the mixed gas ring cavity 5; the outer side of the main gas inlet pipe 1 is coaxially provided with a hydrogen ring cavity 3, and the inner side of the hydrogen ring cavity 3 is attached to the outer side of the mixed gas ring cavity 5; the inner side of the main gas inlet pipe 1 is provided with a plurality of mixing pipes 4 communicated with the hydrogen ring cavity 3, and the outer side of the hydrogen ring cavity 3 is provided with a hydrogen inlet pipe 2; the hydrogen is sprayed out of the mixing pipe 4, and the main fuel gas is mixed with the hydrogen at the position of the mixing pipe 4 and then enters the mixing gas ring cavity 5;
a plurality of mixed gas secondary pipes 11 are arranged on one side of the mixed gas ring cavity 5, which is close to the combustion head outer cover 12; the mixed gas secondary pipes 11 are uniformly distributed; most of the mixture secondary pipe 11 body is surrounded by the burner head housing 12; one end of the mixed gas secondary pipe 11 is communicated with the mixed gas ring cavity 5, and the other end is provided with a plurality of mixed gas holes; the inner sides of the mixed gas ring cavity 5 and the combustion head housing 12 are also provided with a mixed gas central pipe 7, one end of the mixed gas central pipe 7 is communicated with the mixed gas ring cavity 5, and the other end is provided with a plurality of central mixed gas primary spray pipes 15; a plurality of central mixed gas secondary spray pipes 17 are uniformly distributed on the outer side of the mixed gas central pipe 7; one end of the central mixed gas primary spray pipe 15 and one end of the central mixed gas secondary spray pipe 17 are communicated with the mixed gas central pipe 7, and the other end of the central mixed gas primary spray pipe penetrates through the central flame stabilizing disc 16; the central mixed gas primary spray pipe 15 is uniformly distributed on the surface of the central flame stabilizing disc 16; the central mixed gas secondary spray pipe 17 takes the mixed gas central pipe 7 as an axis to be uniformly distributed; after being homogenized in the annular cavity, the mixed gas flows out of the annular cavity in two paths, one path of the mixed gas enters the mixed gas central tube 7, the other path of the mixed gas enters the mixed gas secondary tube 11, and the mixed gas is sprayed out of the mixed gas holes to form micro-premixing with low-oxygen air;
the outer side of the mixed gas central tube 7 is provided with an air accelerating section 8, an air rectifying section 9 and a porous blunt body 10 in sequence from the mixed gas ring cavity 5 to the direction of the combustion head outer cover 12; air enters from the air channel 6 and is distributed into the center and secondary air through the air accelerating section 8, the air rectifying section 9 and the porous blunt body 10. The central air and the secondary air adopt different equivalent ratios, the central air excess coefficient is 1.3, the total air excess coefficient is 1.1, the influence of injection negative pressure at the gap between the mixed gas ring cavity 5 and the combustion head outer cover 12 is caused, the flue gas in the hearth enters the combustor from the gap to be mixed with air, the oxygen content of the air is further reduced, and the circulation rate Kv (internal flue gas mass flow/combustion air mass flow) of the flue gas in the hearth can reach 0.3-0.45. The oxygen content of the air can be reduced to 15.6%, and the chemical reaction process, the distribution of the temperature field in the hearth and the generation of thermal NOx can be effectively controlled.
Compared with the prior art, the low-oxygen dilution combustion hydrogen-doped low-nitrogen burner adjusts the internal flow field of the burner through the porous blunt body 10, and meets the central flame air excess coefficient of 1.3 and the total air excess coefficient of 1.1; the central flame is further divided by the central mixed gas primary spray pipe 15, the central mixed gas secondary spray pipe 17 and the central flame stabilizing disc 16 to form micro flame, the chemical reaction is completed rapidly under the condition of designed equivalence ratio, and the flame temperature is reduced; the micro-premixing small flame combustion is formed through the mixed gas secondary pipe 11 and the outer flame stabilizing disc 13, the deviation of the reaction equivalent ratio from the design value is restrained, the local high temperature is avoided, and the thermal type and rapid NOx generation is reduced; the hypoxia effect is enhanced, and the internal smoke circulation rate Kv (internal smoke mass flow/combustion air mass flow) of the hearth can reach 0.3-0.45. The oxygen content of the air can be reduced to 15.6%, and the chemical reaction process, the distribution of the temperature field in the hearth and the generation of thermal NOx can be effectively controlled.
In some embodiments; the air accelerating section 8 is a contracted cylinder; the aperture of the air acceleration section 8 near one end of the mixed gas ring cavity 5 is larger than the aperture of the air acceleration section far from one end of the mixed gas ring cavity 5; air flows from the air passage 6 into the air acceleration section 8; the air rectifying section 9 is a cylinder with the same aperture size at two ends; the porous blunt body 10 is an enlarged cylinder, the aperture of the end of the porous blunt body 10 close to the mixed gas ring cavity 5 is smaller than the aperture of the end far away from the mixed gas ring cavity 5, and a plurality of through holes are uniformly formed on the surface of the porous blunt body 10; the porous blunt body 10 can quickly form complete induced flow of rectified air, which is helpful for sucking flue gas in a hearth, and meanwhile, the porous blunt body 10 can adjust the flow field in the burner to meet the technical requirement of 1.3 of central flame air excess coefficient and 1.1 of total air excess coefficient; further reduces the oxygen content of air and can effectively control the chemical reaction process, the distribution of temperature fields in the hearth and the generation of thermal NOx.
In some embodiments, the mixing pipes 4 are arranged in parallel, and two ends of the mixing pipe 4 are respectively communicated with the inner wall of the mixing gas ring cavity 5; a plurality of hydrogen holes are uniformly formed on the surface of the mixing pipe 4; the hydrogen in the hydrogen ring cavity 3 uniformly flows out through the hydrogen holes and is fully mixed with the fuel gas flowing in the main fuel gas inlet pipe 1 to finish hydrogen loading and mixing. As a more preferable technical scheme, the mixing pipe 4 is arranged in a multi-pipe array, a plurality of hydrogen holes are formed in the side wall of the pipe, hydrogen is sprayed out of the hydrogen holes, and main fuel gas is mixed with the hydrogen at the position of the mixing pipe 4 and then enters the mixing gas ring cavity 5.
In some embodiments, one end of the gas mixture secondary pipe 11 close to the outer flame stabilizing disc 13 is sealed, the gas mixture is uniformly distributed on the outer wall of the gas mixture secondary pipe 11 close to the outer flame stabilizing disc 13, and the gas mixture is sprayed out from the gas mixture holes to form micro premixing with the low-oxygen air.
In some embodiments, the diameter of the outer flame holding disk 13 is greater than the aperture of the burner head housing 12. Through the arrangement, the flame structure has a certain pulling up in the radial direction, so that the heat exchange efficiency of the burner end is improved, and the energy efficiency is improved.
In some embodiments, the central flame stabilizing plate 16 is a porous and slotted hole composite structure, specifically, a plurality of slotted holes are uniformly arranged on the central flame stabilizing plate 16 along the radial direction, and a plurality of holes are uniformly arranged in other places; the central flame is further divided to form micro flame, which plays a role of stabilizing flame.
In some embodiments, the outer side of the center fireguard barrel 14 is provided with a plurality of rectifying plates 18; the rectifying plates 18 are uniformly arranged around the central fire protection cylinder 14, and the rectifying plates 18 are steel rectifying plates 18; in some embodiments, the number of rectifying plates 18 is 12, the rectifying plates 18 may be rectangular rectifying plates, and an included angle is formed between the rectifying plates and a plane where the central fire protection cylinder 14 is connected, and the included angle may be any angle of 0-90 degrees; after the air and the flue gas in the burner housing 12 are mixed, the vortex which may be formed when the air and the flue gas are mixed is arranged into a design flow field state through the rectifying plate 18.
In some embodiments, the number of center gas mixture primary nozzles 15 is 8-12; the number of the secondary spray pipes 17 of the central mixed gas is 8-12. The arrangement of the split flames further enhances the mixing of air and fuel gas, so that the mixing is more uniform and rapid, the chemical reaction is rapidly completed under the condition of designed equivalence ratio, and the local temperature is avoided, thereby reducing the generation of nitrogen oxides.
In some embodiments, the air flow velocity in the air rectifying section 9 is 50-80m/s; at this time, the internal smoke circulation rate Kv (internal smoke mass flow/combustion air mass flow) of the hearth can reach 0.3-0.45. The oxygen content of the air can be reduced to 15.6%, and the chemical reaction process, the distribution of the temperature field in the hearth and the generation of thermal NOx can be effectively controlled; the hypoxia effect is enhanced.
In some embodiments, the notch angle of the central flame stabilizing disc 16 and the outer flame stabilizing disc 13 is 0-45 degrees, so that the mixed gas and the low-oxygen air sprayed out of the mixed gas secondary pipe 11 are divided again to form micro-premixing small flame combustion, the reaction equivalence ratio is restrained from deviating from the design value, the local high temperature is avoided, the thermal type and the rapid type NOx generation are reduced, the effect of stabilizing the flame is achieved through cyclone backflow, and the combustion stability is further improved.
The invention provides a low-oxygen dilution combustion hydrogen-doped low-nitrogen burner. The description of the specific embodiments is only intended to aid in understanding the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. The utility model provides a low oxygen dilution combustion's low nitrogen combustor of hydrogen that mixes, includes mixing gas ring chamber (5) and combustion head dustcoat (12), mixing gas ring chamber (5) and combustion head dustcoat (12) coaxial setting, its characterized in that:
an outer flame stabilizing disc (13) and a central flame stabilizing disc (16) are sequentially arranged at one end, far away from the mixed gas ring cavity (5), of the combustion head outer cover (12) from outside to inside; a central flame protection cylinder (14) is arranged between the outer flame stabilizing disc (13) and the central flame stabilizing disc (16); the outer side of the mixed gas ring cavity (5) is connected with a main gas inlet pipe (1); the device is characterized in that a hydrogen ring cavity (3) is coaxially arranged on the outer side of the main gas inlet pipe (1), a plurality of mixing pipes (4) communicated with the hydrogen ring cavity (3) are arranged on the inner side of the main gas inlet pipe (1), and a hydrogen inlet pipe (2) is arranged on the outer side of the hydrogen ring cavity (3); a plurality of mixed gas secondary pipes (11) are arranged on one side, close to the combustion head outer cover (12), of the mixed gas ring cavity (5); one end of the plurality of mixed gas secondary pipes (11) is communicated with the mixed gas ring cavity (5), and the other end of the plurality of mixed gas secondary pipes is provided with a plurality of mixed gas holes; the inner sides of the mixed gas ring cavity (5) and the combustion head outer cover (12) are also provided with a mixed gas central pipe (7), one end of the mixed gas central pipe (7) is communicated with the mixed gas ring cavity (5), and the other end of the mixed gas central pipe (7) is provided with a plurality of central mixed gas primary spray pipes (15); a plurality of central mixed gas secondary spray pipes (17) are uniformly distributed on the outer side of the mixed gas central pipe (7); one end of the central mixed gas primary spray pipe (15) and one end of the central mixed gas secondary spray pipe (17) are communicated with the mixed gas central pipe (7), and the other end of the central mixed gas primary spray pipe penetrates through the central flame stabilizing disc (16); the outside of the gas mixture center tube (7) is provided with an air accelerating section (8), an air rectifying section (9) and a porous blunt body (10) in sequence from the gas mixture ring cavity (5) to the direction of the combustion head outer cover (12).
2. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 1 wherein:
the air accelerating section (8) is a contracted cylinder; the aperture of the air acceleration section (8) close to one end of the mixed gas ring cavity (5) is larger than the aperture of the air acceleration section far away from one end of the mixed gas ring cavity (5); the air rectifying section (9) is a cylinder with the same aperture size at two ends; the porous blunt body (10) is an enlarged cylinder, the aperture of one end of the porous blunt body (10) close to the mixed gas ring cavity (5) is smaller than the aperture of one end far away from the mixed gas ring cavity (5), and a plurality of through holes are uniformly formed in the surface of the porous blunt body (10).
3. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 2 wherein:
the mixing pipes (4) are arranged in parallel, and two ends of each mixing pipe (4) are respectively communicated with the inner wall of the mixing gas ring cavity (5); the surface of the mixing pipe (4) is uniformly provided with a plurality of hydrogen holes.
4. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner according to claim 3 wherein:
the gas mixture secondary pipe (11) is close to one end of the outer flame stabilizing disc (13) and is sealed, and the gas mixture holes are uniformly distributed at the position, close to the outer flame stabilizing disc (13), of the outer side of the gas mixture secondary pipe (11).
5. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 4 wherein:
the diameter of the outer flame stabilizing disc (13) is larger than the aperture of the combustion head housing (12).
6. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 5 wherein:
the central flame stabilizing disc (16) is of a porous and slotted hole composite structure.
7. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 6 wherein:
a plurality of rectifying plates (18) are arranged on the outer side of the central fire protection cylinder (14); the rectifying plate (18) is a steel rectifying plate (18).
8. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 7 wherein:
the number of the central mixed gas primary spray pipes (15) is 8-12; the number of the secondary spray pipes (17) of the central mixed gas is 8-12.
9. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 8 wherein:
the air flow velocity in the air rectifying section (9) is 50-80m/s.
10. A low oxygen dilution combustion hydrogen-loaded low nitrogen burner in accordance with claim 9 wherein:
the notch angle of the central flame stabilizing disc (16) and the outer flame stabilizing disc (13) is 0-45 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255435.XA CN116293679A (en) | 2023-03-10 | 2023-03-10 | Low-oxygen dilution combustion hydrogen-doped low-nitrogen combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255435.XA CN116293679A (en) | 2023-03-10 | 2023-03-10 | Low-oxygen dilution combustion hydrogen-doped low-nitrogen combustor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116293679A true CN116293679A (en) | 2023-06-23 |
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ID=86828338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310255435.XA Pending CN116293679A (en) | 2023-03-10 | 2023-03-10 | Low-oxygen dilution combustion hydrogen-doped low-nitrogen combustor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116293679A (en) |
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2023
- 2023-03-10 CN CN202310255435.XA patent/CN116293679A/en active Pending
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