CN202527068U - Compact type high-efficiency denitration device for pulverized coal/fuel boiler - Google Patents
Compact type high-efficiency denitration device for pulverized coal/fuel boiler Download PDFInfo
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- CN202527068U CN202527068U CN2011205449860U CN201120544986U CN202527068U CN 202527068 U CN202527068 U CN 202527068U CN 2011205449860 U CN2011205449860 U CN 2011205449860U CN 201120544986 U CN201120544986 U CN 201120544986U CN 202527068 U CN202527068 U CN 202527068U
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- denitrfying agent
- flue gas
- boiler
- denitration
- agent service
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Abstract
The utility model discloses a compact type high-efficiency denitration device for a pulverized coal/fuel boiler, and belongs to the technical field of high-efficiency denitration of fire coal/fuel boilers. According to the denitration device, pipelines for jetting denitration agents are arranged in a boiler flue, and powerful vortexes can be generated by boiler flue gas through an arc-shaped guide plate, so that the denitration efficiency is obviously improved. The device has a simple and exquisite structure, is small in size, and is easily arranged in a narrow space between two heat absorption devices in the boiler flue; when the boiler flue gas passes through the arc-shaped guide plate in the device at the temperature of more than 830 DEG C, the powerful vortexes are formed by the boiler flue gas; the vortexes which are rotated in two opposite directions are generated between two adjacent pipelines, and can be away from the denitration device after being severely mixed by collision; and the denitration agents are injected into the flue gas by holes/nozzles on the pipelines, and the flue gas vortexes can be quickly mixed with NOx in the flue gas and reacted with the NOx with the help of the collision of the flue gas vortexes in the device, so that nitrogen oxide in the flue gas is effectively reduced.
Description
Technical field
The utility model relates to a kind of efficient denitrification apparatus of tight type that is used for coal dust/thermo oil boiler, belongs to the efficient denitration technology of fire coal/thermo oil boiler field.
Background technology
In denitration (SNCR) scheme of general no catalysis, utilize through injection denitrfying agent such as liquefied ammonia, ammonia or urea liquid in 800-1100 ℃ of flue gas treating process and reduce nitrogen oxide (NO
X) discharge capacity, this method to a certain extent can be with nitrogen oxide (NO
X) be reduced into nitrogen N
2, but the denitration efficiency of SNCR is difficult to above 50%, especially for large-sized boiler.Main cause is that denitration efficiency receives following factor affecting: 1) nitrogen oxide and denitrfying agent are difficult to mixed fully in the combustion chamber; 2) the flue-gas temperature skewness in denitration reaction zone; 3) nitrogen oxide in denitration zone and the ratio of denitrfying agent concentration do not match.Therefore, nowadays a lot of traditional SNCR methods can not satisfy the strict demand to the exhaustion of nitrogen oxides from coal-fired boiler amount.
Occur a kind of new method 70 with the eighties,, utilize catalytic specie to promote reaction with the ammonia removal nitrogen oxide promptly at 300-400 ℃ of left and right sides low-temperature region.Present many coal-burning power plants are provided with selective catalytic reactor (SCR) between the economizer at boiler flue rear portion and air preheater, this place's cigarette temperature drop is between 300-400 ℃.This denitrfying agent is anhydrous ammonia, liquefied ammonia or urea mostly, and the place sprays in the flue gas in economizer exit, and gets into selective catalytic reactor immediately in (SCR).But the efficient of selective catalytic reactor and performance are very sensitive to the various procedures factor, thereby produce a plurality of shortcomings, sum up as follows:
1. the catalytic specie life-span is too short.Catalytic specie life-span length depends on flying dust concentration and its contaminated thing chocking-up degree and the design of catalytic materials in the flue gas.Coal combustion produces a large amount of flying dusts can be caused accelerating to stop up Catalytic Layer, and can significantly reduce the catalytic specie activity in operation after 5000 hours.Every two years changing a Catalytic Layer is through common occurrence.
2. with high investment and high operating cost.The SCR of catalytic denitration system builds and the operating cost costliness.One of main expensive operating cost is relevant with the material of normal replacing catalytic materials.
3. the design of good catalytic bed is unusual The key factor, but in the good design reducing smoke flying dust the accumulation of catalytic materials and caused active reduction of obstruction of hole thereof.
4. good SCR design is very important, especially to factor such as cigarette temperature, and dustiness, nitrogen oxide and the denitrfying agent concentration ratio in flue gas.These factors must evenly distribute before getting into the SCR catalyst converter.Not good enough SCR design will make denitration efficiency reduce, the life-span that shortens catalytic specie with form a large amount of sulfate of ammoniacs maybe, promptly a kind of stickum can stop up catalytic specie air gap and obstruct smoke circulation.
Summary of the invention
In order to solve the problem that exists in the existing SNCR technology; The utility model provides a kind of efficient denitrification apparatus of tight type that is used for coal dust/thermo oil boiler, and it should be through the setting of a string pipeline, and on this a string pipeline, arranges circular arc guide plate and denitrfying agent nozzle; Let denitrfying agent inject boiler smoke; Make boiler smoke can in flue, produce powerful eddy current, through running foul of each other and mix, the denitrfying agent that injects flue gas also can with the NO of flue gas
XSufficient mixing is arranged, through sufficient contact and reaction, to reach the effect of high denitration.It is a significant improvement to former no catalytic denitration system,
The technical scheme of the utility model is: a kind of efficient denitrification apparatus of tight type that is used for coal dust/thermo oil boiler, the boiler smoke that in boiler furnace, produces discharges behind first heat dump, second heat dump and the 3rd heat dump.Between said first heat dump and second heat dump, be provided with row's denitrfying agent service; On each denitrfying agent service, be provided with denitrfying agent spout and circular arc guide plate; The denitrfying agent spout is arranged on the both sides of denitrfying agent service in the face of the boiler smoke flow direction; The circular arc guide plate also is arranged on the both sides of denitrfying agent service, and the cancave cambered surface of circular arc guide plate respectively is provided with a denitrfying agent and carrier import over against the flow direction of boiler smoke at the two ends of denitrfying agent service; Denitrfying agent and carrier behind denitrfying agent and carrier import entering denitrfying agent service, spray into flue through the denitrfying agent spout at the flow direction perpendicular to boiler smoke together.
The quantity of said denitrfying agent service is 1-10.
Said denitrfying agent spout is employed in the structure that row's aperture is set on the denitrfying agent service, or row's denitrfying agent nozzle is set on the denitrfying agent service.
Said denitrfying agent adopts liquefied ammonia, ammonia or urea liquid; Said carrier adopts water vapour, compressed air or water.
The beneficial effect of the utility model is: above-mentioned technical scheme mainly is provided with the pipeline that sprays denitrfying agent in boiler flue, and makes boiler smoke produce powerful eddy current through the circular arc guide plate, significantly improves denitration efficiency.This device is simple, exquisiteness and volume are little, is prone to be arranged in the boiler flue in the small space between two heat dumps.When boiler smoke more than 830 ℃ during through the arc-shaped guide plate in the device, it will form strong eddy current.To produce the eddy current of two opposite direction of rotation at two adjacent pipeline enclosures.These eddy current just leave denitrification apparatus after can colliding and cause violent mixing.Denitrfying agent is by the hole on the pipeline/nozzle injection flue gas, and under the help of flue gas eddy current and collision, ability rapidly and the NOx hybrid concurrency in the flue gas is living reacts, thereby effectively reduces the nitrogen oxide in the flue gas in device.
Description of drawings
Fig. 1 is a kind of compact denitrification apparatus fundamental diagram.
Fig. 2 is the A-A view of Fig. 1.
Fig. 3 is the B-B view of Fig. 2.
Fig. 4 is that the flue gas eddy current forms sketch map.
Among the figure: 1, boiler furnace, 2, boiler smoke, 3, first heat dump; 4, denitrfying agent service, 5, the circular arc guide plate, 6, second heat dump; 7, the flue gas of turning downwards, the 8, the 3rd heat dump, 9, the denitrfying agent spout; 10, denitrfying agent and carrier import, 11, flue, 12,12a, flue gas eddy current.
The specific embodiment
Fig. 1,2,3 shows a kind of compact denitrification apparatus fundamental diagram.Among the figure, the boiler smoke 2 that in boiler furnace 1, produces discharges behind first heat dump 3, second heat dump 6 and the 3rd heat dump 8.Between first heat dump 3 and second heat dump 6, be provided with 4 denitrfying agent services 4; On each denitrfying agent service 4, be provided with 12 denitrfying agent spouts 9 and 2 circular arc guide plates 5; Denitrfying agent spout 9 is arranged on denitrfying agent service 4 comes flow path direction in the face of boiler smoke 2 both sides; Circular arc guide plate 5 also is arranged on the both sides of denitrfying agent service 4; And the cancave cambered surface of circular arc guide plate 5 respectively is provided with a denitrfying agent and carrier import 10 over against the flow path direction that comes of boiler smoke 2 at the two ends of denitrfying agent service 4.Denitrfying agent and carrier behind denitrfying agent and carrier import 10 entering denitrfying agent services 4, spray into flue 11 through denitrfying agent spout 9 at the flow direction perpendicular to boiler smoke 2 together.
Above-mentioned denitrfying agent spout 9 can be employed in the structure that two rows, 6 apertures of every row are set on the denitrfying agent service 4, or two rows, 6 denitrfying agent nozzles of every row are set on denitrfying agent service 4.
Above-mentioned denitrfying agent adopts liquefied ammonia, ammonia or urea liquid; Said carrier adopts water vapour, compressed air or water.Denitrfying agent and carrier get into denitrfying agent service 4 after ancillary equipment fully mixes.
Fig. 4 shows the flue gas eddy current and forms sketch map.In device, boiler smoke 2 forms one powerful flue gas eddy current 12 along circular arc guide plate 5.But before leaving, flue gas eddy current 12 has rightabout flue gas eddy current 12a collision with another thigh and mixes.Denitrfying agent a series of hole or nozzle from tube wall inject the flue gas eddy current, and under the help that the flue gas eddy current runs foul of each other/mixes, denitrfying agent can rapid spread/mixings, the nitrogen oxide in the contact flue gas, can be rapid and NOx react and cause the reduction of NOx.
Claims (4)
1. efficient denitrification apparatus of tight type that is used for coal dust/thermo oil boiler; The boiler smoke (2) that in boiler furnace (1), produces discharges behind first heat dump (3), second heat dump (6) and the 3rd heat dump (8); It is characterized in that: between said first heat dump (3) and second heat dump (6), be provided with row's denitrfying agent service (4); On each denitrfying agent service (4), be provided with denitrfying agent spout (9) and circular arc guide plate (5); Denitrfying agent spout (9) is arranged on the both sides of denitrfying agent service (4) in the face of boiler smoke (2) flow direction; Circular arc guide plate (5) also is arranged on the both sides of denitrfying agent service (4); And the cancave cambered surface of circular arc guide plate (5) respectively is provided with a denitrfying agent and carrier import (10) over against the flow direction of boiler smoke (2) at the two ends of denitrfying agent service (4); Denitrfying agent and carrier behind denitrfying agent and carrier import (10) entering denitrfying agent service (4), spray into flue (11) through denitrfying agent spout (9) at the flow direction perpendicular to boiler smoke (2) together.
2. a kind of efficient denitrification apparatus of tight type that is used for coal dust/thermo oil boiler according to claim 1 is characterized in that: the quantity of said denitrfying agent service (4) is 1-10.
3. a kind of efficient denitrification apparatus of tight type that is used for coal dust/thermo oil boiler according to claim 1; It is characterized in that: said denitrfying agent spout (9) is employed in the structure that row's aperture is set on the denitrfying agent service (4), or row's denitrfying agent nozzle is set on denitrfying agent service (4).
4. a kind of efficient denitrification apparatus of tight type that is used for coal dust/thermo oil boiler according to claim 1 is characterized in that: said denitrfying agent adopts liquefied ammonia, ammonia or urea liquid; Said carrier adopts water vapour, compressed air or water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205449860U CN202527068U (en) | 2011-12-23 | 2011-12-23 | Compact type high-efficiency denitration device for pulverized coal/fuel boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205449860U CN202527068U (en) | 2011-12-23 | 2011-12-23 | Compact type high-efficiency denitration device for pulverized coal/fuel boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202527068U true CN202527068U (en) | 2012-11-14 |
Family
ID=47128276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205449860U Expired - Fee Related CN202527068U (en) | 2011-12-23 | 2011-12-23 | Compact type high-efficiency denitration device for pulverized coal/fuel boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202527068U (en) |
-
2011
- 2011-12-23 CN CN2011205449860U patent/CN202527068U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20131223 |