CN102588955B - Combustion system for reducing nitrogen oxide emission - Google Patents
Combustion system for reducing nitrogen oxide emission Download PDFInfo
- Publication number
- CN102588955B CN102588955B CN201210067850.4A CN201210067850A CN102588955B CN 102588955 B CN102588955 B CN 102588955B CN 201210067850 A CN201210067850 A CN 201210067850A CN 102588955 B CN102588955 B CN 102588955B
- Authority
- CN
- China
- Prior art keywords
- zone
- burner
- combustion
- combustion zone
- main
- 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 68
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000000446 fuel Substances 0.000 claims abstract description 18
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 150000002430 hydrocarbons Chemical class 0.000 claims description 4
- 206010002660 Anoxia Diseases 0.000 claims 1
- 206010021143 Hypoxia Diseases 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract 1
- 239000003546 flue gas Substances 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
- 238000012216 screening Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000006152 selective media Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention relates to a combustion system for reducing nitrogen oxide emission of a pulverized coal boiler, which comprises: the coal pulverizing system and the boiler combustion device mainly combine the technologies of a main combustion area (adopting LNB), a Reburning area (Reburning) and an ember area (adopting Over Fire Air (OFA)) and the like; the main combustion zone belongs to an anoxic zone, and about 77-82 wt% of fuel is provided to the main combustor and air supplied by the blower by the power screener at the outlet of the coal mill; the reburning zone also belongs to an anoxic zone, wherein 18-23 wt% of fuel is provided to the reburning burner by the power screener at the outlet of the coal mill, the staged combustion is used to reduce NOx emission, and the overfire zone provides enough excess air through the air holes on the fire to achieve complete combustion and reduce the concentration of NOx emitted from flue gas.
Description
Technical field
System of the present invention is relevant with combustion system, is particularly to a kind of combustion system that reduces discharged nitrous oxides.
Background technology
Electricity needs is that domestic industry most important resource, especially large enterprise are as petrochemical industry industry, papermaking alwaysIndustry etc., arrange steam-electric accreting factory mostly, except electric power can be provided, also can utilize the rear steam conduct of generating simultaneouslyThermal source. For fuel saving cost, current domestic steam-electric accreting factory is main mainly with coal-burning boiler greatly. Boiler can produceThe air pollutants such as raw oxysulfide, nitrogen oxide; Nitrogen oxide may relate to the shape of acid rain, ground level ozoneBecome, energy-saving and emission-reduction are the primary problems in current countries in the world.
Emission Controlling Technology of Nitric Oxides, has low nitrogen oxide burner (LNB), sectional combustion (staged at presentCombustion), burn again (reburning), smoke backflow method (FGR), selective media reductive method (SCR),And selective non-media reductive method (SNCR) etc., can be used for reducing the discharge of nitrogen oxide.
LNB is two-part burner. First paragraph is supplied approximately 80% theoretical air requirement, the heat producing when burningCan be by the nitrogen in fuel oil or fire coal, due to anoxic, the nitrogen in fuel oil cannot generate nitrogen oxide. Fuel oilOr coal-fired and the burning velocity of remaining air in second stage are compared with slow and reduce flame temperature and then reductionAirborne nitrogen generates the chance of NOx.
Sectional combustion (StagedCombustion) is that burner is turned round under rich fuel condition, at burnerThe upper air (OverFiredAir, OFA) of fire is established in top, the air of residue is sent into reduce nitrogen oxide rawBecome.
Burning is fuel segmentation supply again. First stage is supplied approximately 80% fuel, and second stage supply approximately10～20%, the phase III is supplied fuel and the sufficient air of residue approximately 10%, to reduce nitrogen oxideGenerate.
Commercialization nitrogen oxide control technology is quite a lot of at present, but distinct device must be chosen best controlTechnology processed, under the prerequisite that meets discharge standard, does the effort of maximum possible minimizing discharge capacity. Therefore, asWhere in economically viable situation, choose and combine best control technology, reaching maximum possible and reduce rowHigh-volume be still a major challenge.
In view of this, the inventor, for to improve and to solve above-mentioned disappearance, is that spy concentrates on studies and coordinates scientific principleUtilization, finally propose a kind of reasonable in design and effectively improve the present invention of above-mentioned disappearance.
Summary of the invention
One of the object of the invention, is to provide a kind of combustion system, to reduce the discharge of nitrogen oxide.
According to technical scheme provided by the invention, described combustion system comprises: coal pulverized coal preparation system and boiler combustionBurn device, have and combine main combustion zone (adopting LNB), combustion zone (Reburning) and burnt zone (employing againAir on fire (OFA)) etc. technology; Genus anoxic zone, main combustion zone, is provided by coal pulverizer outlet power screening washer77～82wt% left and right fuel is to main burner and air that pressure fan supplies; Combustion zone Yi Shu anoxic zone again, by grindingCoal machine outlet power screening washer provides the fuel quantity of 18～23wt% to recombustion burner, and burning reduces stage by stageNOx discharge, on the fire of burnt zone, airport provides enough excess airs again, reduces completely to reach burningFlue gas NOx concentration of emission.
Combustion system of the present invention is equiped with the upper airport of low nitrogen oxide burner, again burner and fire, warpCan reduce the discharge of nitrogen oxide by arranging cleverly.
Brief description of the drawings
Fig. 1 is the combustion system schematic diagram of the minimizing discharged nitrous oxides of one of the present invention embodiment.
Description of reference numerals: 1, combustion system, 10, burner, 12, main burner, 14, burn againDevice, 16, airport on fire, 102, burner hearth, 104, main combustion zone, 106, combustion zone again, 108, combustionCinder district.
Detailed description of the invention
Relevant the present invention's detailed description and technology contents, coordinate graphic being described as follows, but appended only graphicProvide with reference to and explanation use, be not used in addition limitr of the present invention.
Please refer to figure, the combustion system schematic diagram of one of Fig. 1 is the present invention embodiment. This combustion system 1 is wrappedDraw together: burner 10, main burner 12 be burner 14 and the upper airport 16 of fire again. Burner 10 stovesThorax 102 has main combustion zone 104, again combustion zone 106 and burnt zone 108.
In the present embodiment, main burner 12 is to provide 77～82wt% fuel by coal pulverizer outlet power screening washer,And the air that provides of pressure fan is to main combustion zone 104, and main burner 12 is arranged in burner 10Four jiaos become two layers of quadrangle tangential circle. Burner 14 is to provide 18～23wt% by coal pulverizer outlet power screening washer againFuel, and the air that provides of pressure fan is to combustion zone 106 again, then burner 14 is arranged in burner 10Wall on become one deck surrounding each two become the circle of contacts. On fire, airport 16 is to be arranged on 106 tops, combustion zone again,Being arranged on the wall of burner 10 becomes each two of one deck surrounding to become the circle of contacts. Provide via airport on fire 16Enough air, form burnt zone 108 to guarantee the unburning material completing combustion in burner 10. The present embodimentIn, main combustion zone 104, combustion zone 106 and burn up the aspect ratio a in district 108 again: b: c is 1.2: 1: 2.5.
In the present embodiment, respectively via main burner 12 and burner 14 again, the extremely main combustion of feeding air and fuelBurn 104Yu Zai combustion zone, district 106. The present embodiment adopts (reburning) technology of burning again, in main combustion zone104 provide 77 to 82wt% fuel, and provide 18 to 23wt% fuel in combustion zone 106 again.
In addition, the present embodiment adopts low nitrogen oxide burner (LNB) and sectional combustion (stagedCombustion) technology, the excess air ratio 0.95 to 0.97 of the main combustion zone 104 of combustion system 1, better0.96, belong to anoxic zone. The excess air ratio 0.80 to 0.85 of combustion zone 106 again, better 0.83, belong toMore anoxic zone. Burnt zone 108 excess air ratios 1.10 to 1.30, better 1.20. In combustion zone again 106 li,Combustion fuel produces a large amount of ionic hydrocarbons by the condition of micro-anoxic again, these ionic hydrocarbons and upstreamThe reaction of nitrogen oxides of main combustion zone 104, becomes nitrogen to reduce nitrogen oxide to reach reduction of nitrogen oxideEffect.
Combustion technology can be widely used in various boiler again, and size is regardless of, and it removes the effect of nitrogen oxideBe decided by flow field kenel in temperature, residence time and the burner of Yu Zai combustion zone, main combustion zone etc. because ofElement; Generally speaking, residence time is longer, and temperature is lower, and the effect of removing nitrogen oxide is larger, for keepingCompleting combustion in best nitrogen oxide removal efficiency and burner, then the fuel nozzle of burner and fireUpper air nozzle must design perfect.
The combustion system and the combustion that LNB, again burner and the upper airport of fire are not installed of the present embodiment are below describedThe comparison of burning system, as table one:
Table one
From the data of table one, the present embodiment, in conjunction with the upper airport of LNB, again burner and fire, is not fallingUnder the effectiveness of performance of low combustion system, can reduce unburned carbon in flue dust from 6% to 3% dense with the discharge of nitrogen oxideDegree is from 830 to 250mg/Nm3.
Claims (2)
1. a combustion system that reduces discharged nitrous oxides, comprising:
One burner, has main combustion zone, again combustion zone and burnt zone;
One main burner, this main burner is arranged in two layers of quadrangle tangential circle of four jiaos of one-tenth of burner, to provideAir and fuel are to main combustion zone;
Burner again and again, this again burner arrangement on the wall of burner, become one deck surrounding each two become the circle of contactsTo provide air and fuel to combustion zone again; And
Airport at least one fire, is arranged on this combustion zone top again, is arranged on the wall of burner and becomes oneEach two of layer surrounding becomes the circle of contact, provides enough air via airport on this fire, forms this burnt zone; WhereinThe aspect ratio of this main combustion zone, again combustion zone and burnt zone is 1.2:1:2.5, this main combustion zone excess airRate 0.95 to 0.97, this is combustion zone excess air ratio 0.80 to 0.83 again, this burnt zone excess air ratio 1.10To 1.30;
Wherein, this main combustion zone belongs to anoxic zone, and this belongs to more anoxic zone in combustion zone again, and this exists combustion zone againUnder micro-anoxia condition, produce a large amount of ionic hydrocarbons, the nitrogen oxide of those ionic hydrocarbons and this main combustion zone is anti-Should, reduction of nitrogen oxide is become to nitrogen.
2. combustion system as claimed in claim 1, wherein provides 77 to 82wt%'s in this main combustion zoneFuel, provides 18 to 23wt% fuel in combustion zone again at this.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100136360 | 2011-10-06 | ||
| TW100136360A TWI435036B (en) | 2011-10-06 | 2011-10-06 | Combustion system with low nitrogen oxides emission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102588955A CN102588955A (en) | 2012-07-18 |
| CN102588955B true CN102588955B (en) | 2016-05-04 |
Family
ID=46477985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210067850.4A Active CN102588955B (en) | 2011-10-06 | 2012-03-15 | Combustion system for reducing nitrogen oxide emission |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102588955B (en) |
| TW (1) | TWI435036B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335304B (en) * | 2013-06-28 | 2016-06-08 | 广东电网公司电力科学研究院 | Quadrangle tangential circle Combustion System of Boiler Burning Fine |
| CN104913300A (en) * | 2015-06-23 | 2015-09-16 | 丹东蓝天环保锅炉制造有限公司 | Graded multifuel combustion coal-fired industrial furnace and use method thereof |
| CN109340789B (en) * | 2018-11-26 | 2024-06-14 | 江苏中圣园科技股份有限公司 | Carbon black tail gas low-nitrogen stable combustion process and carbon black tail gas low-nitrogen stable combustion system |
| CN114183746B (en) * | 2021-10-27 | 2024-01-30 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Over-fire air nozzle structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584396A (en) * | 2004-06-07 | 2005-02-23 | 上海电力学院 | Method for generating multistage reburning controlling high-capacity coal fired boiler NOX |
| CN101016986A (en) * | 2007-02-28 | 2007-08-15 | 哈尔滨工业大学 | Method for burning of low nitrogen oxides in coal-burning boiler |
| CN101074775A (en) * | 2007-06-28 | 2007-11-21 | 上海交通大学 | Densed-phase back-flushing split-pole NOx combustion |
| CN101078517A (en) * | 2007-06-08 | 2007-11-28 | 华北电力大学 | Method for simultaneously removing SO2, NOx from coal-fired furnace |
| CN101721904A (en) * | 2010-01-21 | 2010-06-09 | 山东大学 | Composite denitration method by biomass direct reburning and selective non-catalytic reduction |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62166209A (en) * | 1986-01-17 | 1987-07-22 | Mitsubishi Heavy Ind Ltd | Burner |
| JP3915951B2 (en) * | 1998-04-21 | 2007-05-16 | バブコック日立株式会社 | Boiler combustion equipment |
| CN1804459A (en) * | 2005-12-16 | 2006-07-19 | 浙江大学 | Method and apparatus for re-burning denitration of coal water slurry |
-
2011
- 2011-10-06 TW TW100136360A patent/TWI435036B/en active
-
2012
- 2012-03-15 CN CN201210067850.4A patent/CN102588955B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584396A (en) * | 2004-06-07 | 2005-02-23 | 上海电力学院 | Method for generating multistage reburning controlling high-capacity coal fired boiler NOX |
| CN101016986A (en) * | 2007-02-28 | 2007-08-15 | 哈尔滨工业大学 | Method for burning of low nitrogen oxides in coal-burning boiler |
| CN101078517A (en) * | 2007-06-08 | 2007-11-28 | 华北电力大学 | Method for simultaneously removing SO2, NOx from coal-fired furnace |
| CN101074775A (en) * | 2007-06-28 | 2007-11-21 | 上海交通大学 | Densed-phase back-flushing split-pole NOx combustion |
| CN101721904A (en) * | 2010-01-21 | 2010-06-09 | 山东大学 | Composite denitration method by biomass direct reburning and selective non-catalytic reduction |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201315943A (en) | 2013-04-16 |
| CN102588955A (en) | 2012-07-18 |
| TWI435036B (en) | 2014-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102588955B (en) | Combustion system for reducing nitrogen oxide emission | |
| CN100400962C (en) | Method for reburning nitrogen oxides by coal combustion boiler and apparatus thereof | |
| CN202884901U (en) | Boiler capable of realizing reignition of exhaust gas coal powder by using high-temperature flue gas and reducing NOx | |
| CN103697466A (en) | Circulating fluidized bed boiler with smoke recirculating bypass, and NOX discharging method | |
| CN102705818B (en) | Wall-attached wind distribution method of boiler combustor | |
| CN103697465A (en) | Boiler capable of achieving reignition of exhaust gas coal powder and reducing NOx by using high-temperature flue gas | |
| CN103672862A (en) | Low-nitrogen combustion device without primary air and secondary air, and application method | |
| CN103672883A (en) | Grid type swirl burner | |
| CN204460265U (en) | Coal dust piece-rate system in a kind of boiler milling system | |
| CN103261789B (en) | Reduce the system and method for the discharge from boiler | |
| CN104154532A (en) | Center air ring concentrated type turbulent burner | |
| CN101569829B (en) | Method for jointly controlling emission of NOx by utilizing multi-stage bias combustion and fuel reburning | |
| CN203628631U (en) | Low-nitrogen combustion device without main secondary air | |
| CN103115357A (en) | Circulating fluidized bed fire coal (waste incineration) boiler oxygen enrichment pulverized coal igniting steady burning device | |
| CN208205001U (en) | A kind of low NO with humidifier | |
| CN2881359Y (en) | Oxygen enriched powdered coal burner | |
| CN101430098B (en) | Method and apparatus for improving primary air breeze gas flow temperature of W-shaped flame boiler | |
| CN102563625A (en) | Oxygen-enriched combustion method for pulverized coal | |
| CN203131804U (en) | Pulverized coal boiler utilizing tangential firing | |
| CN108386865B (en) | A kind of 300MW coal unit reduces the control device and method of unburned carbon in flue dust | |
| CN103134050B (en) | Multi-coal low-nitrogen pulverized coal combustion device with gap wind | |
| CN201081231Y (en) | Dense and thin oil-saving ignition powdered coal burner | |
| CN1226552C (en) | Low Nox combustor with mixed coal and gas fuel | |
| CN216282761U (en) | Low-resistance low-NOx RSP type decomposing furnace | |
| CN204213918U (en) | A kind of multiple flow burnout degree spray nozzle device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 214187 Jiangsu Province, Huishan City, the town of Los Angeles Zhongxing West Road, No. 43 Patentee after: WUXI LONGCHEN GREENTECH CO., LTD. Address before: 214187 Jiangsu Province, Huishan City, the town of Los Angeles Zhongxing West Road, No. 43 Patentee before: Rongcheng Paper Industry Co., Ltd., Wuxi |