CN102166472A - Spiral-flow type ammonia spraying device used for selective catalytic reduction (SCR) denitrification system - Google Patents
Spiral-flow type ammonia spraying device used for selective catalytic reduction (SCR) denitrification system Download PDFInfo
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- CN102166472A CN102166472A CN2011100458393A CN201110045839A CN102166472A CN 102166472 A CN102166472 A CN 102166472A CN 2011100458393 A CN2011100458393 A CN 2011100458393A CN 201110045839 A CN201110045839 A CN 201110045839A CN 102166472 A CN102166472 A CN 102166472A
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- ammonia
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- ammonia spraying
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 61
- 238000005507 spraying Methods 0.000 title claims abstract description 35
- 238000010531 catalytic reduction reaction Methods 0.000 title abstract 2
- 239000000203 mixture Substances 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 abstract description 21
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 30
- 239000003546 flue gas Substances 0.000 description 30
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000012895 dilution Substances 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 210000004534 cecum Anatomy 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The invention discloses a spiral-flow type ammonia spraying device used for a selective catalytic reduction (SCR) denitrification system. The spiral-flow type ammonia spraying device comprises a plurality of ammonia spraying pipes arranged in a flue, wherein the upper ends of the ammonia spraying pipes are connected with an ammonia and air mixed gas supply header pipe, the lower ends are closed, and the ammonia spraying pipes are provided with spray holes. The spiral-flow type ammonia spraying device is characterized in that: each ammonia spraying pipe or a plurality of the ammonia spraying pipes are provided with a valve of which the flow can be adjusted singly; and the spraying holes are provided with spiral-flow type nozzles. By using an SCR smoke gas denitrification device adopting the ammonia spraying device, the ammonia gas is sprayed out from the spiral-flow type nozzles to form a great amount of vortexes on the lower part of the ammonia spraying device, and the ammonia gas enwraps the smoke gas in a spiral mode, so that the disturbed intensity is strengthened to ensure that the sprayed ammonia gas is fully and uniformly mixed with the smoke gas, the distance required for mixing the ammonia gas and the smoke gas is greatly shortened, and the denitrification efficiency is improved. Simultaneously, because the aperture of the ammonia nozzles is large and the amount of the nozzles is reduced, when a machine group is in underload operation, the machine group is also ensure to achieve block-less operation, and the ammonia spraying adjustment difficulty and the maintenance cost are reduced.
Description
Technical field
The present invention relates to a kind of power-plant flue gas denitration or similar field are sprayed ammonia in flue gas device that is used for, belong to the technical field of environmental protection equipment.
Background technology
Nitrogen oxide is one of atmosphere major pollutants in coal-burning boiler and the similar device discharging tail gas, present SCR (SCR) gas denitrifying technology, because its efficient height, stable performance are widely used in the engineering both domestic and external, become the mainstream technology that generating plant flue gas removes nitrogen oxide.The SCR cardinal principle is to adopt liquefied ammonia or ammoniacal liquor as reducing agent, with its with spray in the upstream flue of SCR reactor after air mixes, under the effect of catalyst with flue gas in nitrogen oxide react nontoxic, the free of contamination nitrogen G﹠W of generation.
In each process procedure of SCR denitration technology, it is to guarantee to react completely that the ammonia of dilution mixes with the even diffusion of flue gas, improves denitration efficiency and ammonia utilization rate, and the key factor of the low the escaping of ammonia rate of control.Ammonia is excessive in some zone, can cause superfluous the escaping of ammonia to go out reactor, causes second environmental pollution, also easily causes the generation of side reaction, causes the denitration effect variation; The ammonia quantity not sufficient that some is regional, the result who then causes NOx not to be reduced.Therefore, the quality of this " mixing link " effect is directly connected to the success or failure of a whole set of denitrification apparatus.
At present ammonia-gas spraying device generally adopts ammonia-spraying grid (AIG) on the engineering, it by be arranged in together pipeline with and on aperture forms, ammonia-spraying grid adopts the adjusting of multi-point injection subregion, to adapt to NOx CONCENTRATION DISTRIBUTION in the flue gas.A little less than the ammonia and flue gas disturbance excessively of ammonia-spraying grid ejection, mixed effect is relatively poor, causes like this mixing apart from long, can not guarantee when flue length is not enough that especially ammonia and flue gas mix, thereby influence denitration efficiency.Simultaneously, because the nozzle hole number of ammonia-spraying grid many (often reaching hundreds of), the uniformity of spray ammonia can also be guaranteed under the unobstructed situation of spray orifice, but owing to injection diameter is little, the flue gas flow rate of flowing through herein is lower usually, especially exhaust gas volumn reduces when the unit underrun, and flue gas flow rate is lower, and therefore the dust stratification clogging takes place spray orifice in service often, it is inhomogeneous to cause ammonia to spray, directly influence the denitration efficiency in the Benitration reactor, and this system's adjusting is very complicated, often breaks down.
Summary of the invention
Technical problem:In order to overcome the defective of traditional SCR denitrating system ammonia-spraying grid, the invention provides a kind of spiral-flow type ammonia-gas spraying device, this device can address the above problem preferably, strengthen the mixed effect of ammonia and flue gas, to improve denitration efficiency and ammonia utilization rate, reduce SR, reduce the escaping of ammonia.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:A kind of spiral-flow type ammonia-gas spraying device that is used for the SCR denitrating system, comprise the some amonia adjutages that are arranged in the flue, the upper end of described amonia adjutage is connected with ammonia, air gas mixture supply main, and the lower end is then sealed, amonia adjutage is provided with spray-hole, it is characterized in that; Be furnished with the valve that a flow can be regulated separately at every amonia adjutage or some amonia adjutages, on described spray-hole, swirl jet be installed.
Under same working condition, the aperture of described swirl jet is 2 ~ 5 times of amonia adjutage internal diameter.
Described swirl jet inside is provided with helix.
This device is arranged in the flue by some amonia adjutages, and the upper end of amonia adjutage is connected with ammonia, air gas mixture supply main, and the lower end then is a cecum; Every amonia adjutage or some amonia adjutages all are furnished with the valve that a flow can be regulated separately.Amonia adjutage is based on metallic conduit, the footpath of every amonia adjutage upwards is provided with plurality of big footpath swirl jet, this nozzle bore is 2 ~ 5 times of traditional SCR denitrating system ammonia-spraying grid nozzle bore, and arranges along the axial equal intervals ground of amonia adjutage, and nozzle is communicated with amonia adjutage.This nozzle adopts the frame mode of helix cutting, and ammonia is entered by tangential direction, sprays with spiral-flow type from nozzle behind spiral.Load in mixture by force on the basis of putting at above-mentioned spiral-flow type spray ammonia, a kind of SCR method flue-gas denitration process that uses this device also is provided, the velocity of flue gas by this device is defined as 15m/s ~ 25m/s; Accordingly, the flow velocity of described nozzle spray ammonia is 40m/s ~ 70m/s.Ammonia sprays with spiral-flow type through nozzle, and improved like this ammonia-gas spraying device can make the ammonia of ejection generate a large amount of whirlpools in its downstream, produces violent disturbance, accelerates the mixing diffusion of ammonia in flue gas, reduces to mix distance, improves denitration efficiency.Simultaneously, because the ammonia nozzle bore is big, the quantity of nozzle reduces, and guaranteeing still to accomplish when the unit underrun does not have the operation of obstruction, has reduced spray ammonia and has regulated difficulty and maintenance cost.
Beneficial effect:Compared with prior art, characteristics of the present invention have:
(1) adopt the spiral-flow type ammonia-gas spraying device can form stable whirlpool in its downstream, thereby add strong disturbance, enhancing ammonia mixes with flue gas, improves denitration efficiency.Meanwhile, owing to shortened the length of mixing, thereby can reduce to enter the length and the volume of the flue section of SCR device, further reduce the volume of whole SCR device, reduce the denitrating system resistance, reduce the escape of ammonia and bleeding of air.
(2) this apparatus structure is reasonable, effectively reduced the quantity of amonia adjutage and spray orifice, reduced the device fabrication cost, and because nozzle bore is big, it is not enough effectively to solve aperture spray ammonia rigidity, can guarantee still to accomplish when the unit underrun does not have the operation of obstruction, has reduced spray ammonia and has regulated difficulty and maintenance cost.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing:
Fig. 1 is the SCR denitrating technique schematic diagram that adopts the spiral-flow type ammonia-gas spraying device.
Fig. 2 is a spiral-flow type ammonia-gas spraying device overall schematic;
Fig. 3 is the structural representation (left side) and the left view (right side) of swirl jet.
Fig. 4 is that spiral-flow type spray ammonia loads in mixture the schematic diagram of the ammonia of putting injection when mixing with flue gas by force.
Have among the figure: 1. boiler, 2. economizer, 3. spiral-flow type ammonia-gas spraying device, 4. SCR reactor, 5. air preheater, 6. ammonia inlet, 7. ammonia and air mixer, 8. heater, 9. dilution blower fan; 10. flue, 11. amonia adjutages; 12. swirl jet, 13, ammonia; 14, flue gas.
The specific embodiment
Describe the present invention below in conjunction with accompanying drawing, the description of this part only is exemplary and explanatory, should any restriction not arranged to protection scope of the present invention.Present embodiment is that example describes with the coal-fired plant boiler, but is not limited to be applied in other combustion apparatus.
SCR denitrating technique schematic diagram as shown in Figure 1, the flue gas that boiler 1 burning back produces is by economizer 2 heat exchange, it is 5% mist that ammonia is mixed into the ammonia volume content with hot-air from dilution blower fan 9, swirl jet spray 12 by ammonia-gas spraying device 3 is gone in the flue gas, and in SCR reactor 4 connection flues, fully mix with flue gas, after rectification, enter SCR reactor 4, nitrogen oxide in SCR reactor 4 in the flue gas is removed the part nitrogen oxide with ammonia gas react under the effect of catalyst, flue gas after being purified enters air preheater and carries out heat exchange, flue-gas temperature is reduced to about 150 ℃, enters next step flue gas treatment facility such as electric cleaner then, enter atmosphere by chimney behind the flue gas desulfur device.
Fig. 2 shows spiral-flow type ammonia-gas spraying device overall schematic, is furnished with some amonia adjutages 11 on the cross section of flue 10, and an end of amonia adjutage 11 is connected with ammonia air gas mixture supply main, and the other end then seals.Every amonia adjutage or some amonia adjutages are furnished with valve, and its flow can be regulated separately, equidistant several swirl jets of arranging on amonia adjutage.Under the same working condition, this nozzle bore is 3 times of traditional SCR denitrating system ammonia-spraying grid nozzle bore.
Fig. 3 shows the structural representation of swirl jet.This nozzle adopts the frame mode of helix cutting, and ammonia 13 is entered by tangential direction, sprays with spiral-flow type from nozzle behind spiral.
Fig. 4 is ammonia that ammonia-gas spraying device the sprays schematic diagram when mixing with flue gas.Flue gas 14 is 15m/s ~ 25m/s by the drift limit of this device, the flow velocity of nozzle spray ammonia is 40m/s ~ 70m/s, when ammonia when said nozzle sprays with spiral-flow type, form a large amount of whirlpools in the downstream of ammonia-gas spraying device, because the speed of ammonia gaseous mixture is fast, and the flow velocity of flue gas on every side is relatively low, the ammonia of ejection can be with the spiral parcel of flue gas, thereby adds strong disturbance, can strengthen the mixing of ammonia and flue gas to the full extent, realize minimizing of mixing length, improve denitration efficiency.Simultaneously, because the ammonia nozzle bore is big, the quantity of nozzle reduces, and guaranteeing still to accomplish when the unit underrun does not have the operation of obstruction, has reduced spray ammonia and has regulated difficulty and maintenance cost.
Claims (2)
1. spiral-flow type ammonia-gas spraying device that is used for the SCR denitrating system, comprise the some amonia adjutages that are arranged in the flue, the upper end of described amonia adjutage is connected with ammonia, air gas mixture supply main, and the lower end is then sealed, amonia adjutage is provided with spray-hole, it is characterized in that; Be furnished with the valve that a flow can be regulated separately at every amonia adjutage or some amonia adjutages, on described spray-hole, swirl jet be installed.
2. spiral-flow type ammonia-gas spraying device according to claim 1 is characterized in that: described swirl jet inside is provided with helix.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100458393A CN102166472A (en) | 2011-02-25 | 2011-02-25 | Spiral-flow type ammonia spraying device used for selective catalytic reduction (SCR) denitrification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100458393A CN102166472A (en) | 2011-02-25 | 2011-02-25 | Spiral-flow type ammonia spraying device used for selective catalytic reduction (SCR) denitrification system |
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| CN102166472A true CN102166472A (en) | 2011-08-31 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190238A (en) * | 2014-09-17 | 2014-12-10 | 山东志伟电子科技有限公司 | Reverse multi-point swirl-injection denitrating device |
| CN104785103B (en) * | 2015-03-30 | 2016-08-24 | 北京工业大学 | A kind of ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering |
| CN108579375A (en) * | 2018-06-20 | 2018-09-28 | 山东国舜建设集团有限公司 | Sintering device flue gas is heated cooperates with denitrification apparatus and method of denitration with ammonia mixing and SNCR |
| CN109381997A (en) * | 2018-11-06 | 2019-02-26 | 清华大学 | A kind of flue gas temperature adjustment gametic fertility integral system |
| CN111151134A (en) * | 2020-01-22 | 2020-05-15 | 苏州西热节能环保技术有限公司 | A prevent stifled type ammonia injection grid and SCR denitrification facility for coal fired power plant SCR denitration |
| CN112221346A (en) * | 2020-10-30 | 2021-01-15 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Ammonia spray grid for SCR denitration system |
| CN112619416A (en) * | 2020-12-16 | 2021-04-09 | 苏州西热节能环保技术有限公司 | Efficient ammonia water direct injection and ammonia spraying system arranged at circular flue at outlet of combustion engine |
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| CN202113779U (en) * | 2011-02-25 | 2012-01-18 | 中环（中国）工程有限公司 | Spiral-flow type ammonia spraying device used for SCR (Selective Catalytic Reduction) denitration system |
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2011
- 2011-02-25 CN CN2011100458393A patent/CN102166472A/en active Pending
Patent Citations (8)
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| CN1745882A (en) * | 2005-08-16 | 2006-03-15 | 卢作基 | Self-adaption flow-field ammonia jetter |
| DE102006049591A1 (en) * | 2005-11-29 | 2007-05-31 | Fleetguard, Inc., Nashville | Catalytic selective reduction system with urea promotion, for diesel engine exhaust gas, has good cold start performance by upstream injection of electrically preheated aqueous solution in enhanced spray dispersion |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190238A (en) * | 2014-09-17 | 2014-12-10 | 山东志伟电子科技有限公司 | Reverse multi-point swirl-injection denitrating device |
| CN104190238B (en) * | 2014-09-17 | 2016-03-23 | 山东志伟电子科技有限公司 | Reverse multiple spot swirl injection denitrification apparatus |
| CN104785103B (en) * | 2015-03-30 | 2016-08-24 | 北京工业大学 | A kind of ammonia spraying and mixing system device for SCR Flue Gas Denitrification Engineering |
| CN108579375A (en) * | 2018-06-20 | 2018-09-28 | 山东国舜建设集团有限公司 | Sintering device flue gas is heated cooperates with denitrification apparatus and method of denitration with ammonia mixing and SNCR |
| CN109381997A (en) * | 2018-11-06 | 2019-02-26 | 清华大学 | A kind of flue gas temperature adjustment gametic fertility integral system |
| CN111151134A (en) * | 2020-01-22 | 2020-05-15 | 苏州西热节能环保技术有限公司 | A prevent stifled type ammonia injection grid and SCR denitrification facility for coal fired power plant SCR denitration |
| CN112221346A (en) * | 2020-10-30 | 2021-01-15 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Ammonia spray grid for SCR denitration system |
| CN112619416A (en) * | 2020-12-16 | 2021-04-09 | 苏州西热节能环保技术有限公司 | Efficient ammonia water direct injection and ammonia spraying system arranged at circular flue at outlet of combustion engine |
| CN112619416B (en) * | 2020-12-16 | 2025-03-14 | 苏州西热节能环保技术有限公司 | A high-efficiency ammonia direct injection system arranged in the circular flue at the outlet of the gas turbine |
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Application publication date: 20110831 |