CN108662585B - Low-load stable-combustion ultralow NOXCombustion system and combustor thereof - Google Patents
Low-load stable-combustion ultralow NOXCombustion system and combustor thereof Download PDFInfo
- Publication number
- CN108662585B CN108662585B CN201810737004.6A CN201810737004A CN108662585B CN 108662585 B CN108662585 B CN 108662585B CN 201810737004 A CN201810737004 A CN 201810737004A CN 108662585 B CN108662585 B CN 108662585B
- Authority
- CN
- China
- Prior art keywords
- air channel
- secondary air
- air
- channel
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 59
- 239000000446 fuel Substances 0.000 claims abstract description 25
- 239000000779 smoke Substances 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 12
- 239000003546 flue gas Substances 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 239000003345 natural gas Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 208000000059 Dyspnea Diseases 0.000 claims 1
- 206010013975 Dyspnoeas Diseases 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 13
- 238000004064 recycling Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- -1 nitrogen organic compound Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D17/00—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
- F23D17/002—Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel gaseous or liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a low-load stable combustion ultralow NO X combustion system and a burner thereof, wherein the burner comprises a precombustion chamber, a central air channel, a primary air channel, a direct-current air channel and an inner secondary air channel which are coaxially sleeved from inside to outside in sequence at one side of an inlet of the precombustion chamber, and an outer secondary air channel is arranged on a shell outside the precombustion chamber; the combustion system comprises a burner, a fuel bin connected with the front end of the burner, a boiler and an air preheater connected with the rear end of the burner in sequence; the fuel bin is communicated with the primary air channel by adopting a variable-diameter pipeline; the preheating output end of the air preheater is divided into three parts, and the three preheated hot air flows are respectively introduced into the burner by induced draft fans and are connected with the direct current air channel, the inner secondary air channel and the outer secondary air channel. The burner can effectively reduce the emission of thermal NO X and fuel NO X, and when the combustion system is operated under a changed load, the pulverized coal bin can reasonably utilize the reducing pipeline to control the quantity of the transported fuel, so that the smoke recycling and low-load stable combustion are realized.
Description
Technical Field
The invention belongs to the field of heat energy and power engineering, and relates to a low-load stable combustion ultralow NO X combustion system and a combustor thereof.
Background
Although research and development speeds of new energy are gradually accelerated, at present, the energy structure in China still takes coal as a main body, and pollutants such as nitrogen oxides, sulfur oxides, dust and the like generated by combustion of the coal have serious influence on the physical health and living environment of people, so that the pollution problem is paid attention to.
Nitrogen oxides are one of the main atmospheric pollutants, mainly referred to as NO and NO 2, whereas the nitrogen oxides produced by combustion of pulverized coal at high temperatures are mostly NO. Nitrogen oxides in the atmosphere are a major factor in the formation of photochemical smog and also a major source of PM2.5 particles, one of the major factors in the formation of haze across the country. In addition, nitrogen oxides can be converted into nitric acid or nitrous acid when meeting water, acid rain is formed, buildings are corroded, and the human health can be endangered. The emission standards for pollutants such as NO X are strict year by year. At present, the control method of nitrogen oxides mainly comprises two main types of flue gas denitration and combustion denitration. Common flue gas denitration methods mainly comprise a selective catalytic reduction method and a selective non-catalytic reduction method. The combustion denitration technology comprises a low NO X combustor, biomass or sludge combustion, air staged combustion, flue gas recirculation and other methods.
The burner is the main equipment of the boiler, how to improve the stability of low-load pulverized coal combustion and reduce the emission of NO X is the focus of the research of the pulverized coal combustion device. Split-phase combustion is a key technology for realizing ultralow-nitrogen combustion of pulverized coal. The principle is that the split-phase combustion of volatile matters N and coke N is realized through air depth classification. The low-temperature lean oxygen combustion of volatile matters in the precombustion chamber and coke in the hearth is realized through a precombustion chamber type burner. The generation of fuel NOX is reduced, the generation of thermal NO X is also reduced, and the ultralow-nitrogen combustion of the pulverized coal is further realized. However, when the existing burner with the precombustor is in low load, the air quantity and the powder quantity are not in linear match, so that when the primary air quantity is reduced, the concentration of the pulverized coal is reduced too much, and even the phenomenon of pipeline powder sinking occurs when powder is fed in front of a furnace, so that the pulverized coal is seriously influenced; the inner wall and the outlet of the precombustion chamber are easy to form slag, the central air passage of the burner with the precombustion chamber is easy to accumulate powder, and the ignition gun is easy to be blocked; during the low-load operation of the boiler, the supercooling degree of the hearth is large, the temperature of the recirculated flue gas is too low, which is unfavorable for reducing the generation of NO X and influencing the combustion of pulverized coal in the precombustion chamber; for the combustion system with the precombustor, except primary air, all the secondary air comes from hot air behind the air preheater, and the same blower supplies air, so that all the secondary air is seriously blown in a cross manner, and the influence of the secondary air and the air is larger.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the ultralow NO X combustion system with low load and stable combustion and the burner thereof, which have simple structure and reasonable design, can reduce nitrogen oxides, and realize full combustion of fuel and low emission of pollutants.
The invention is realized by the following technical scheme:
The low-load stable-combustion ultralow NO X burner comprises a precombustion chamber, wherein a central air channel, a primary air channel, a direct-current air channel and an inner secondary air channel are coaxially sleeved on one side of an inlet of the precombustion chamber from inside to outside in sequence, and an outer secondary air channel is arranged on an outer shell of the precombustion chamber;
The center of the central air channel is provided with an oil-gas dual-purpose ignition gun, the oil-gas dual-purpose ignition gun can be arranged on a high-energy ignition device outside the central air channel in a telescopic way, and the telescopic end of the oil-gas dual-purpose ignition gun extends into the precombustion chamber or the hearth; the side wall of the precombustion chamber is provided with a plurality of outer secondary air outlets communicated with an outer secondary air channel, and a plurality of perimeter air nozzles are arranged on the secondary air channel at the part exceeding the precombustion chamber shell; the direct current wind channel is provided with a smoke and hot air switching tee joint, one end of the direct current wind channel is connected, the other end of the direct current wind channel is used for being connected with natural gas or smoke, and the third end of the direct current wind channel is used as an inlet of the direct current wind channel.
Preferably, the inner side of the primary air channel is provided with a telescopic sleeve, and the telescopic sleeve slides and stretches along the inner wall of the primary air channel.
Preferably, at least three arc swirl blades which are uniformly distributed are arranged in the inner secondary air channel.
Preferably, the outlet of the primary air channel is provided with a thick ring, a thin ring and flame stabilizing teeth in sequence; at least three openings are uniformly arranged on the shade ring.
Preferably, one side of the primary air channel is provided with a primary air inlet, and a flue gas bypass is arranged; the inner secondary air channel and the direct current air channel share an inlet, and the inlet is divided by a baffle; the primary air inlet, the direct-current air channel and the inner secondary air channel are respectively provided with a butterfly valve, and the proportion of the inner secondary air to the outer secondary air is regulated by regulating the opening of the butterfly valve.
Preferably, the outer secondary air outlet is an inclined arc-shaped opening, and an included angle between the outer secondary air outlet and the wall surface of the precombustion chamber is an acute angle; an adjustable valve capable of sliding along the opening direction is arranged in the outer secondary air outlet.
Preferably, the perimeter wind spout comprises an outer overgrate wind upper spout opening upwards along the radial direction of the outer overgrate wind channel, an outer overgrate wind lower spout opening at the tail end of the outer overgrate wind channel, and flap valves respectively arranged on the outer overgrate wind upper spout and the outer overgrate wind lower spout.
The ultralow NO X combustion system with low load and stable combustion comprises the burner, a fuel bin connected with the front end of the burner, and a boiler and an air preheater connected with the rear end of the burner in sequence; the fuel bin is communicated with the primary air channel by adopting a variable-diameter pipeline; the preheating output end of the air preheater is divided into three parts, and the three preheated hot air flows are respectively introduced into the burner by induced draft fans and are connected with the direct current air channel, the inner secondary air channel and the outer secondary air channel.
Further, the flue gas of the boiler is recycled through a pipeline to replace hot air to be connected into a burner; the preheating output end of the air preheater is connected into a boiler furnace through an OFA pipeline.
Further, the three preheated hot air flows are respectively introduced into the burner by induced fans through a direct-current air pipeline, an inner secondary air pipeline and an outer secondary air pipeline; a first control valve and a direct current air valve are arranged on the direct current air pipeline; the inner secondary air pipeline is connected to the direct-current air pipeline between the first control valve and the direct-current air valve, and the second control valve and the inner secondary air valve are sequentially arranged on the inner secondary air pipeline; the outer secondary air pipeline is connected to the inner secondary air pipeline between the second control valve and the inner secondary air valve, and the outer secondary air pipeline is provided with the outer secondary air valve.
Compared with the prior art, the invention has the following beneficial technical effects:
According to the invention, the oil-gas dual-purpose ignition gun is arranged in the center of the central air channel, so that the functions of heating furnace and ignition are achieved; the direct current air channel is provided with a smoke and hot air switching tee joint, smoke is recycled or natural gas is introduced, NO X is reduced, hot air is introduced during low load, and combustion is more stable; the nitrogen organic compound in the fuel is heated and pyrolyzed into intermediate products such as Hydrogen Cyanide (HCN), ammonia (NH 3) and CN, and the intermediate products can react with oxygen to generate N 2 under the condition of a small amount of oxygen, so that the effect of reducing the generation of fuel type NO X is achieved, and the emission of NO X is effectively reduced. Through the overgrate air spout that surpasses the prechamber casing plays combustion-supporting and makes the effect that the fuel was completely burnt, intermediate products such as hydrogen cyanide burns under low oxygen environment, has not only reduced flame temperature, and hydrogen cyanide etc. can preferential reaction with oxygen under the insufficient condition produce H 2O,N2 and CO 2 moreover, has effectively reduced the emission of thermal type NO X and fuel type NO X.
Further, through the telescopic sleeve that the inner layer set up of primary air passageway, can slide and stretch along the inner wall under low load, reduce primary air passageway area, improve primary air and take the powder ability, prevent that the powder of primary air passageway from leading to dense and thin looks to burn by asthma.
Furthermore, the concentration of the fuel is increased through the thick and thin rings uniformly provided with the openings, the fuel and the natural gas entering through the direct-current wind channel are quickly pyrolyzed and combusted in the precombustion chamber, and hot air can be introduced to stabilize combustion in low load.
Furthermore, by uniformly arranging a plurality of swirl blades in the inner secondary air channel, swirl secondary air can be generated, enough high-temperature smoke is returned, and stable combustion is ensured; the outer secondary air nozzle is provided with an adjustable valve, so that the flow speed can be ensured and the air quantity can be reduced during low load; meanwhile, the outer secondary air nozzles are arc-shaped and are arranged at a certain angle, staggered virtual tangential circles are formed at the outlet of the precombustion chamber, high-temperature flue gas is refluxed, and stable combustion is ensured. The internal and external secondary air is arranged in a grading way, so that low-temperature oxygen-deficient combustion in the precombustion chamber is realized, and the generation of NO X is reduced.
Furthermore, the secondary air nozzle obtained by the opening avoids dust accumulation and slag formation, and the air inlet of each opening is flexibly controlled by the flap valve.
When the system is operated under a load change, the pulverized coal bin can reasonably utilize the reducing pipeline to control the quantity of fuel conveyed, and hot air at the outlet of the air preheater is divided into three parts, namely direct-current air, inner secondary air and outer secondary air, and the three parts are sent into the burner by the blower, and boiler flue gas is recycled and connected into the burner, so that the flue gas recycling and low-load stable combustion are realized.
Furthermore, the pipeline for introducing three air flows through the induced draft fan is of a split-flow type design, so that three hot air flows can be independently adjusted. The bottom supporting wind is additionally arranged at the lower part of the burner to promote the coal dust in the hearth area at the lower part of the burner to burn out.
Drawings
FIG. 1 is a schematic view of the overall structure of a burner according to the present invention.
FIG. 2 is a diagram of a secondary air channel swirl vane of the present invention.
FIG. 3 is a diagram of a concentrated ring structure of the present invention.
FIG. 4 is a block diagram of an external overgrate air jet of the present invention.
Fig. 5 is a structural view of an outer overgrate air outlet of the present invention.
Fig. 6 is a schematic diagram of the overall structure of the system according to the present invention.
Fig. 7 is a schematic structural view of the air intake duct of the burner of the present invention.
In the figure: 1. a high energy ignition device; 2. oil-gas dual-purpose igniting gun; 3. a telescoping sleeve; 4. a central wind channel; 5. a primary air passage; 6. a primary air inlet; 7. the smoke and hot air are switched into a tee joint; 8. butterfly valve; 9. a direct-current wind channel; 10. an inner secondary air channel; 11. swirl vanes; 12. a shade ring; 13. flame stabilizing teeth; 14. an outer secondary air channel; 15. a retractable valve; 16. an outer secondary air outlet; 17. perimeter wind jets; 18. a precombustion chamber; 19. an induced draft fan; 20. an opening; 21. an outer secondary air upper nozzle; 22. an outer secondary air lower nozzle; 23. a flap valve; 24. a fuel bin; 25. a burner; 26. a pi-type furnace; 27. an air preheater.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention relates to a low-load stable-combustion ultralow NO X combustor which comprises a precombustion chamber 18, wherein a central air channel 4, a primary air channel 5, a direct-current air channel 9 and an inner secondary air channel 10 are arranged on one side of an inlet of the precombustion chamber 18, and an outer secondary air channel 14 is arranged on a shell of the precombustion chamber 18. An oil-gas dual-purpose ignition gun 2 is arranged at the center of the central air passage 4, and a high-energy ignition device 1 is arranged at one side of the oil-gas dual-purpose ignition gun 2; the oil-gas dual-purpose ignition gun 2 can extend out from the tail end of the high-energy ignition device 1 and extend out from the front end into the precombustion chamber 18 or the hearth, so that a heating furnace and high-efficiency ignition are realized; the side wall of the precombustion chamber 18 is provided with a plurality of outer secondary air outlets 16, and the outer side of the precombustion chamber 18 shell is provided with a plurality of perimeter air nozzles 17; primary air enters from a primary air inlet 6 of a primary air channel 5 and is provided with a smoke bypass, so that the temperature of the primary air is adjustable; the direct current air channel 9 is provided with a smoke and hot air switching tee joint 7, and shares an inlet with the inner secondary air channel 10, and is separated by a baffle plate, so that stable combustion of low-load hot air is realized, high-load smoke is recycled, and NO X is reduced; the outer secondary air outlet 16 is provided with an adjustable valve, so that the flow rate can be ensured, and the air quantity can be reduced.
The invention adopts the improvement of an oil-gas dual-purpose ignition gun 2, a primary air channel 5, a shade ring 12, a direct current air channel 9, an inner secondary air outlet structure, an outer secondary air outlet structure, a fuel bin pipeline and the like to obtain the ultralow NO X combustor with low load and stable combustion, which comprises a precombustion chamber 18 as shown in figure 1, wherein a central air channel 4, the primary air channel 5, the direct current air channel 9 and an inner secondary air channel 10 are sequentially sleeved on one inlet side of the precombustion chamber 18 from inside to outside, and an outer secondary air channel 14 is arranged on an outer shell of the precombustion chamber 18. The center of the central air channel 4 is provided with an oil-gas dual-purpose ignition gun 2, and one side of the oil-gas dual-purpose ignition gun 2 is provided with a high-energy ignition device 1; the oil-gas dual-purpose ignition gun 2 extends out from the tail end of the high-energy ignition device 1 and extends out from the front end into the precombustion chamber 18 or the hearth; the side wall of the precombustion chamber 18 is provided with a plurality of outer secondary air outlets 16 communicated with the outer secondary air channel 14, and the outer side of the precombustion chamber 18 shell is provided with a plurality of perimeter air nozzles 17; primary air enters through the primary air inlet 6; the direct current air channel 9 is provided with a smoke and hot air switching tee joint 7, and shares an inlet with the inner secondary air channel 10 and is divided by a baffle plate.
The primary air passage 5 is provided with a telescopic sleeve 3, the cylindrical structure is closely attached to the inner wall of the passage, and fuel deposited on the cylinder wall can be sent into the precombustion chamber 18 when the primary air quantity under low load is small.
The tail end of the oil-gas dual-purpose ignition gun 2 is connected with the high-energy ignition device 1, the oil-gas dual-purpose ignition gun 2 can be sent to a hearth to perform heating furnace work, and the oil-gas dual-purpose ignition gun 2 can be contracted in the high-energy ignition device 1. The oil-gas dual-purpose ignition gun 2 is arranged in the center of the central wind channel 4, and extends into the precombustion chamber 18 during ignition to complete ignition action.
As shown in fig. 2, at least 3 arc swirl blades 11 which are uniformly distributed are arranged in the inner secondary air channel 10; the present preferred example is illustrated by taking 8 examples.
The outlet of the primary air channel 5 is provided with a thick and thin ring 12 and flame stabilizing teeth 13 for improving the stability of fuel combustion. As shown in fig. 3, the light-shade ring 12 has a structure of a latest design, at least three openings are provided, and in the preferred embodiment, four openings 20 are provided on the ring to perform the function of concentrating and pressurizing the fuel.
The primary air channel 5 can be filled with pulverized coal, biomass fuel or powdery sludge, or mixture powder of any two or three.
The primary air inlet 6, the direct current air channel 9 and the inner secondary air channel 10 are respectively provided with a butterfly valve 8, and the proportion of the inner secondary air to the outer secondary air can be adjusted by adjusting the opening of the valve.
The direct current wind channel 9 is provided with a smoke and hot air switching tee joint 7, and smoke recirculation is adopted, so that hot air and natural gas can be introduced, NO X can be reduced, hot air is introduced during low load, and combustion is more stable.
The precombustion chamber 18 is provided with a plurality of outer secondary air outlets 16, the outer secondary air outlets 16 are inclined arc-shaped openings, and an included angle between each outer secondary air outlet 16 and the wall surface of the precombustion chamber 18 is an acute angle, preferably 60 degrees; and there is an adjustable valve 15, as shown in fig. 5, for adjusting the magnitude of the external secondary air quantity, reducing the air quantity while ensuring the secondary air flow rate.
The peripheral air nozzle 17 has a special structure, as shown in fig. 4, and is divided into an outer secondary air upper nozzle 21, an outer secondary air lower nozzle 22 and a nozzle flap valve 23, so that the proportion of the upper nozzle secondary air to the lower nozzle secondary air can be adjusted, the outer secondary air can fully play a role, and the effects of fuel combustion supporting and burnout are achieved.
In the low-load stable-combustion ultralow NO X combustion system, a fuel bin 24 connected with the front end of a combustor 25 is communicated with a primary air channel 5 by adopting a variable-diameter pipeline; a boiler and an air preheater 27 connected in sequence to the rear end of the burner 25, the boiler in this preferred example being a pi-type furnace 26; the preheating output end of the air preheater 27 can be divided into three parts by a partition plate or provided in a split-flow type; the preheated three hot air flows are respectively introduced into the burner 25 by the induced draft fan 19 and are connected with the direct current air channel 9, the inner secondary air channel 10 and the outer secondary air channel 14.
As shown in fig. 7, the air intake duct of the burner 25 is provided in a split-flow type, which includes a direct-flow air duct, an inner secondary air duct, and an outer secondary air duct, which are provided in a split-flow type. The three preheated hot air flows are respectively led into the burner 25 through the direct-current air pipeline, the inner secondary air pipeline and the outer secondary air pipeline by the induced draft fan 19; a first control valve and a direct current air valve are arranged on the direct current air pipeline; the inner secondary air pipeline is connected to the direct-current air pipeline between the first control valve and the direct-current air valve, and the second control valve and the inner secondary air valve are sequentially arranged on the inner secondary air pipeline; the outer secondary air pipeline is connected to the inner secondary air pipeline between the second control valve and the inner secondary air valve, and is provided with the outer secondary air valve; thereby realizing the independent adjustment of the direct current wind, the inner secondary wind and the outer secondary wind.
In the ultralow NO X combustion system with low load and stable combustion, as shown in FIG. 6, the flue gas of the boiler is recycled through a pipeline to replace hot air to be connected into the combustor 25; the preheating output end of the air preheater 27 is connected into the boiler furnace through an OFA pipeline, and the set OFA can enable the whole furnace to be in a low-temperature oxygen-deficient combustion state, so that NO X is reduced.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. Standard parts used in the invention can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, and the specific connection modes of the parts adopt conventional means such as mature bolts, rivets, welding, pasting and the like in the prior art, and the detailed description is omitted. It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The ultralow NO X combustor with low load and stable combustion is characterized by comprising a precombustion chamber (18), wherein a central air channel (4), a primary air channel (5), a direct air channel (9) and an inner secondary air channel (10) are coaxially sleeved on one side of an inlet of the precombustion chamber (18) from inside to outside in sequence, and an outer secondary air channel (14) is arranged on an outer shell of the precombustion chamber (18);
The center of the central air channel (4) is provided with an oil-gas dual-purpose ignition gun (2), the oil-gas dual-purpose ignition gun (2) can be arranged on the high-energy ignition device (1) outside the central air channel (4) in a telescopic way, and the telescopic end of the oil-gas dual-purpose ignition gun extends into the precombustion chamber (18) or the hearth; the side wall of the precombustion chamber (18) is provided with a plurality of outer secondary air outlets (16) communicated with the outer secondary air channel (14), and a plurality of perimeter air nozzles (17) are arranged on the secondary air channel (14) at the part exceeding the shell of the precombustion chamber (18); the direct-current air channel (9) is provided with a smoke and hot air switching tee joint (7), one end of the direct-current air channel (9) is connected, the other end of the direct-current air channel is used for accessing natural gas or smoke, and the third end of the direct-current air channel is used as an inlet of the direct-current air channel (9);
The inner side of the primary air channel (5) is provided with a telescopic sleeve (3), and the telescopic sleeve (3) slides and stretches along the inner wall of the primary air channel (5) to reduce the area of the primary air channel (5), improve the powder carrying capacity of the primary air and prevent the powder accumulation of the primary air channel from causing dense-thin phase dyspnea;
An adjustable valve (15) capable of sliding along the opening direction is arranged in the outer secondary air outlet (16);
The perimeter wind spout (17) comprises an outer overgrate wind upper spout (21) which is opened upwards along the radial direction of the outer overgrate wind channel (14), an outer overgrate wind lower spout (22) which is arranged at the tail end opening of the outer overgrate wind channel (14), and flap valves (23) which are respectively arranged on the outer overgrate wind upper spout (21) and the outer overgrate wind lower spout (22).
2. The low-load stable combustion ultralow NO X burner according to claim 1, wherein at least three arc swirl vanes (11) which are uniformly distributed are arranged in the inner secondary air channel (10).
3. The low-load stable-combustion ultralow NO X burner according to claim 1, wherein the outlet of the primary air channel (5) is provided with a thick-thin ring (12) and flame stabilizing teeth (13) in sequence; at least three openings (20) are uniformly arranged on the shade ring (12).
4. The low-load stable combustion ultralow NO X burner according to claim 1, wherein a primary air inlet (6) is arranged on one side of the primary air channel (5) and a flue gas bypass is arranged; the inner secondary air channel (10) and the direct current air channel (9) share an inlet, and the inlet is divided by a baffle; the primary air inlet (6), the direct current air channel (9) and the inner secondary air channel (10) are respectively provided with a butterfly valve (8), and the proportion of the inner secondary air and the outer secondary air is regulated by regulating the opening of the butterfly valve (8).
5. The low-load stable combustion ultralow NO X burner according to claim 1, wherein the outer secondary air outlet (16) is an inclined arc-shaped opening and forms an acute angle with the wall surface of the precombustion chamber (18).
6. An ultralow NO X combustion system with low load and stable combustion is characterized by comprising a combustor (25) as claimed in any one of claims 1-5, a fuel bin (24) connected with the front end of the combustor (25), and a boiler and an air preheater (27) connected with the rear end of the combustor (25) in sequence; the fuel bin (24) is communicated with the primary air channel (5) by adopting a variable-diameter pipeline; the preheating output end of the air preheater (27) is divided into three parts, and the three preheated hot air flows are respectively introduced into the burner (25) by the induced draft fan (19) and are connected with the direct current air channel (9), the inner secondary air channel (10) and the outer secondary air channel (14).
7. The low-load stable combustion ultralow NO X combustion system according to claim 6, wherein the flue gas of the boiler is recycled through a pipeline to replace hot air and is connected into the combustor (25); the preheating output end of the air preheater (27) is connected into the boiler furnace through an OFA pipeline.
8. The low-load stable combustion ultralow NO X combustion system according to claim 6, wherein the preheated three hot air flows are respectively introduced into the burner (25) through a direct-current air pipeline, an inner secondary air pipeline and an outer secondary air pipeline by induced fans (19); a first control valve and a direct current air valve are arranged on the direct current air pipeline; the inner secondary air pipeline is connected to the direct-current air pipeline between the first control valve and the direct-current air valve, and the second control valve and the inner secondary air valve are sequentially arranged on the inner secondary air pipeline; the outer secondary air pipeline is connected to the inner secondary air pipeline between the second control valve and the inner secondary air valve, and the outer secondary air pipeline is provided with the outer secondary air valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810737004.6A CN108662585B (en) | 2018-07-06 | 2018-07-06 | Low-load stable-combustion ultralow NOXCombustion system and combustor thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810737004.6A CN108662585B (en) | 2018-07-06 | 2018-07-06 | Low-load stable-combustion ultralow NOXCombustion system and combustor thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108662585A CN108662585A (en) | 2018-10-16 |
| CN108662585B true CN108662585B (en) | 2024-05-28 |
Family
ID=63773767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810737004.6A Active CN108662585B (en) | 2018-07-06 | 2018-07-06 | Low-load stable-combustion ultralow NOXCombustion system and combustor thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108662585B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111847909B (en) * | 2019-04-25 | 2022-08-16 | 中冶长天国际工程有限责任公司 | Spray gun, spray gun control method and lime kiln with spray gun |
| CN110160048A (en) * | 2019-05-08 | 2019-08-23 | 山东辰跃节能科技有限公司 | A kind of suitable air duct air heating gas combustion apparatus |
| CN112443833B (en) * | 2019-09-05 | 2023-01-06 | 中国科学院工程热物理研究所 | Pulverized coal fired boiler with bottom-mounted burner and control method thereof |
| CN111912110A (en) * | 2020-08-06 | 2020-11-10 | 华帝股份有限公司 | Burner, gas heat exchange equipment and combustion control method |
| CN111911961B (en) * | 2020-09-02 | 2021-07-06 | 西安交通大学 | Natural gas high-proportion hydrogen-blending combustion burner |
| CN114992626B (en) * | 2022-04-26 | 2024-05-24 | 浙江伊诺环保集团股份有限公司 | A secondary jetting burner for fly ash catches recovery |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201475997U (en) * | 2009-08-31 | 2010-05-19 | 中国计量学院 | Coal dust burner with self-stabilizing capability, three-stage air-distribution and low NOx content |
| WO2012163107A1 (en) * | 2011-05-27 | 2012-12-06 | 上海锅炉厂有限公司 | Dense-phase swirl pulverized coal burner |
| CN104180368A (en) * | 2014-08-26 | 2014-12-03 | 山西蓝天环保设备有限公司 | Medium-and-low temperature hot fume powder feeding type coal powder combustion device and combustion process thereof |
| CN104315502A (en) * | 2014-10-17 | 2015-01-28 | 西安交通大学 | Biomass low-temperature pre-burning low-volatile inferior coal low-NOx combustion device |
| CN105841143A (en) * | 2016-05-25 | 2016-08-10 | 上海华之邦科技股份有限公司 | System and method for reducing NOx emissions through smoke recycling |
| CN205504974U (en) * | 2016-04-01 | 2016-08-24 | 北京佳德昌科技有限责任公司 | Low nitrogen coal burner |
| CN106287667A (en) * | 2016-10-08 | 2017-01-04 | 西安交通大学 | A kind of high temperature gases recirculating preheating type low-NOx combustor being provided with SOFA |
| CN107606606A (en) * | 2017-09-21 | 2018-01-19 | 哈尔滨工业大学 | Powder " Ω " shape industrial coal powder boiler is given at a kind of center using flue gas recirculation |
| CN208779450U (en) * | 2018-07-06 | 2019-04-23 | 西安交通大学 | A kind of ultralow NOX combustion system and its burner of low-load combustion-stabilizing |
-
2018
- 2018-07-06 CN CN201810737004.6A patent/CN108662585B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201475997U (en) * | 2009-08-31 | 2010-05-19 | 中国计量学院 | Coal dust burner with self-stabilizing capability, three-stage air-distribution and low NOx content |
| WO2012163107A1 (en) * | 2011-05-27 | 2012-12-06 | 上海锅炉厂有限公司 | Dense-phase swirl pulverized coal burner |
| CN104180368A (en) * | 2014-08-26 | 2014-12-03 | 山西蓝天环保设备有限公司 | Medium-and-low temperature hot fume powder feeding type coal powder combustion device and combustion process thereof |
| CN104315502A (en) * | 2014-10-17 | 2015-01-28 | 西安交通大学 | Biomass low-temperature pre-burning low-volatile inferior coal low-NOx combustion device |
| CN205504974U (en) * | 2016-04-01 | 2016-08-24 | 北京佳德昌科技有限责任公司 | Low nitrogen coal burner |
| CN105841143A (en) * | 2016-05-25 | 2016-08-10 | 上海华之邦科技股份有限公司 | System and method for reducing NOx emissions through smoke recycling |
| CN106287667A (en) * | 2016-10-08 | 2017-01-04 | 西安交通大学 | A kind of high temperature gases recirculating preheating type low-NOx combustor being provided with SOFA |
| CN107606606A (en) * | 2017-09-21 | 2018-01-19 | 哈尔滨工业大学 | Powder " Ω " shape industrial coal powder boiler is given at a kind of center using flue gas recirculation |
| CN208779450U (en) * | 2018-07-06 | 2019-04-23 | 西安交通大学 | A kind of ultralow NOX combustion system and its burner of low-load combustion-stabilizing |
Non-Patent Citations (1)
| Title |
|---|
| 贾华平.水泥生产技术与实践.中国建材工业出版社,2018,(第1版),第174-176页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108662585A (en) | 2018-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108662585B (en) | Low-load stable-combustion ultralow NOXCombustion system and combustor thereof | |
| CN203099814U (en) | Pulverized coal burner | |
| CN106287667A (en) | A kind of high temperature gases recirculating preheating type low-NOx combustor being provided with SOFA | |
| CN109882841B (en) | Decoupling gas burner | |
| CN103759258A (en) | Fuel-saving/gas-ignition stable-combustion low-nitrogen swirling pulverized coal combustor | |
| CN107606606A (en) | Powder " Ω " shape industrial coal powder boiler is given at a kind of center using flue gas recirculation | |
| CN208154470U (en) | A kind of remote burnout degree second level eddy flow wide regulating ratio low-NOx combustor | |
| WO2021169326A1 (en) | Low-nitrogen gas burner suitable for medium-and-low heat value fuels | |
| CN208779450U (en) | A kind of ultralow NOX combustion system and its burner of low-load combustion-stabilizing | |
| CN113028393A (en) | Ultra-low load stable combustion burner suitable for deep peak regulation | |
| CN109931605B (en) | Multistage air distribution radial outer thick and inner thin cyclone burner | |
| CN102563687A (en) | Oxygen-enriched combustion system | |
| CN204042867U (en) | A kind of low-NO_x burner system | |
| CN105674257A (en) | Two-stage-adjustable steam plasma swirl burner | |
| CN104154532A (en) | Center air ring concentrated type turbulent burner | |
| CN105465780A (en) | Ultralow NOx pulverized coal burner | |
| CN105605560B (en) | Micro- discharge pulverized coal combustion system | |
| CN109654485A (en) | A kind of swirling pulverized coal combustion device using flue gas recirculation and precombustion chamber | |
| CN206130963U (en) | Low NOx combustor of high temperature flue gas backward flow pre -burning formula with SOFA | |
| CN102588997A (en) | Oxygen enriched combustion system | |
| CN205402704U (en) | Two -stage adjustable steam plasma cyclone burner | |
| CN108413382B (en) | Burner for single combustion or mixed combustion of biomass and natural gas | |
| CN209196868U (en) | The low nitrogen of carbon black tail gas surely fires system | |
| CN208418734U (en) | A kind of low-NOx combustor for natural gas and coal dust | |
| WO2023071260A1 (en) | Turbulent burner capable of simultaneously burning nh3 and pulverized coal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |