CN202387364U - Efficient denitrification device of pulverized coal boiler - Google Patents
Efficient denitrification device of pulverized coal boiler Download PDFInfo
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- CN202387364U CN202387364U CN2011205251135U CN201120525113U CN202387364U CN 202387364 U CN202387364 U CN 202387364U CN 2011205251135 U CN2011205251135 U CN 2011205251135U CN 201120525113 U CN201120525113 U CN 201120525113U CN 202387364 U CN202387364 U CN 202387364U
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- denitrfying agent
- pulverized
- boiler
- benitration reactor
- efficient denitrification
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Abstract
The utility model discloses an efficient denitrification device of a pulverized coal boiler and belongs to the technical field of efficient denitrification of the pulverized coal boiler. The efficient denitrification device of the pulverized coal boiler mainly utilizes a V-shaped denitrification reactor, wherein the V-shaped denitrification reactor is arranged into a space between a hearth outlet of the pulverized coal boiler and a tube bundle heat exchanger of a shaft flue, and a partition bin is arranged inside the reactor. The smoke from a hearth respectively enters the partition bin along a direction of a tangent line, and the smoke in the partition bin forms eddies in two opposite directions. A denitrifying agent is simultaneously or independently injected from a smoke inlet of the partition bin and the top parts of the eddies. A mixing speed of the denitrifying agent and nitrogen oxides in the smoke is strengthened in an eddy area of the partition bin; and reduction of the nitrogen oxides in the smoke is facilitated, and the content of the nitrogen oxides in the smoke is obviously reduced. The efficient denitrification device is simple in structure, low in cost and high in denitrifying efficiency without deeply reforming a boiler flue.
Description
Technical field
The present invention relates to the efficient denitrification apparatus of pulverized-coal fired boiler, belong to the efficient denitration technology of coal-burning boiler field.
Background technology
In the denitration scheme of general no catalysis, utilize through adding 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 N
2, but its denitration efficiency 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 can not get sufficient mixing 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, and many shortcomings are arranged, and sum up as follows:
1. the catalytic specie life-span is too short.Catalytic specie life-span length depends on flying dust concentration and the contaminated thing chocking-up degree thereof 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 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, and the life-span and the potential of a large amount of sulfate of ammoniacs of formation that shorten catalytic specie possibly can stop up catalytic specie air gap and obstruct smoke circulation by a kind of stickum.
The utility model content
In order to solve the problem that exists in the prior art; The utility model provides a kind of efficient denitrification apparatus of pulverized-coal fired boiler; It is a significant improvement to the SNCR system; Powerful eddy current in unique location through some denitrfying agent nozzles and the V-type Benitration reactor significantly improves the denitration reaction effect, increases NO in the flue gas
XWith the mixing of denitrfying agent with contact, to reach efficient denitration effect.
The technical scheme of the utility model is: a kind of efficient denitrification apparatus of pulverized-coal fired boiler; Place the furnace outlet of pulverized-coal fired boiler and the space between the vertical well gas flue pipe bundle heat exchanger; Said denitrification apparatus adopts a V-type Benitration reactor; Be placed in second superheater back, and there is a square compartment its inside, place, compartment right angle is provided with arc-shaped guide plate or is divided into hexagon and makes its smooth and easy transition; This V-type Benitration reactor becomes the tangential to be connected with the boiler exhaust gas road of pulverized-coal fired boiler, and the bottom connects the vertical well gas flue pipe bundle heat exchanger; Side in said boiler exhaust gas road and V-type denitration reactor inlet position is provided with the first denitrfying agent nozzle, is provided with the second denitrfying agent nozzle at the inner annular chamber top that forms of the compartment of said V-type Benitration reactor.
Described V-type Benitration reactor, its place, inner compartment right angle is provided with arc-shaped guide plate or is divided into hexagon and makes its smooth and easy transition, and the flue gas in compartment forms two rightabout eddy current.
In side, said boiler exhaust gas road and V-type denitration reactor inlet position first a denitrfying agent nozzle that in the boiler exhaust gas road, sprays denitrfying agent is set at least.
At the inner annular chamber top that forms of the compartment of said V-type Benitration reactor second a denitrfying agent nozzle that in the V-type Benitration reactor, sprays denitrfying agent is set at least.
Said denitrfying agent adopts liquefied ammonia, ammonia or urea liquid.
Adopt above-mentioned technical scheme; The flue-gas temperature of coming out from boiler furnace is between 800-1100 ℃; Flue gas tangentially gets into respectively in the square compartment of V-type Benitration reactor through the boiler exhaust gas road and second superheater; In compartment, form two rightabout eddy current, the flue gas in the compartment is in strong eddy current and admixture.Denitrfying agent (like ammonia or urea liquid etc.) is perhaps installed nozzles injection from these two positions simultaneously from the side of boiler exhaust gas road and V-type denitration reactor inlet, the top of V-type Benitration reactor.Denitrfying agent can spread rapidly with the eddy flow in the reactor after getting into flue gas, and in the eddy flow district, forms aerosol post diaphragm.This aerosol post diaphragm can impel contacting of nitrogen oxide and denitrfying agent and prevent the nitrogen oxide escape, and flue gas leaves reactor continued flow further downstream, through pipe bundle heat exchanger.When the cigarette temperature was within 800-1100 ℃ optimum range, the quick and reaction of nitrogen oxides of ammonia compound meeting in the flue gas impelled NO
XBe reduced into nitrogen, thereby improve denitration efficiency, reduce the discharging of nitrogen oxide.
The beneficial effect of the utility model is: the efficient denitrification apparatus of this pulverized-coal fired boiler is installed nozzle injection denitrfying agent in the side at boiler exhaust gas road and V-type denitration reactor inlet place and the top of V-type Benitration reactor; Through strong eddy current and the immixture of flue gas in reactor; Strengthened the mixing velocity of nitrogen oxide in denitrfying agent and the flue gas; Promote the reduction of nitrogen oxide in the flue gas, significantly reduced the amount of nitrogen oxides of flue gas.And need not boiler flue is carried out deep transformation, simple in structure, with low cost, denitration efficiency is high.
Description of drawings
Fig. 1 is a kind of efficient denitrification apparatus fundamental diagram of pulverized-coal fired boiler.
Fig. 2 is that the boiler exhaust gas road is connected sketch map with V-type Benitration reactor tangential.
Among the figure: 1, pulverized-coal fired boiler, 2, boiler smoke, 2a, flue gas eddy flow, 3, second superheater; 4, boiler exhaust gas road, 5, the V-type Benitration reactor, 5a, compartment, 6, second denitrfying agent; 7, first denitrfying agent, 8, vertical well gas flue, 9, reheater, 10, first superheater; 11, economizer, 12, the denitrfying agent pipeline, 13, the denitrfying agent supply pump.
The specific embodiment
Fig. 1,2 shows a kind of efficient denitrification apparatus fundamental diagram of pulverized-coal fired boiler.Among the figure, denitrification apparatus adopts a V-type Benitration reactor 5, and this V-type Benitration reactor 5 is connected with 4 one-tenth tangentials, boiler exhaust gas road of pulverized-coal fired boiler 1, and the bottom is connected with the vertical well gas flue 8 of pulverized-coal fired boiler 1.This V-type Benitration reactor 5 is arranged on second superheater, 3 back.4 are provided with the first denitrfying agent nozzles 7 of 4 injection denitrfying agents to boiler exhaust gas road 4 in the side of locating of V-type Benitration reactor 5 inlet in the boiler exhaust gas road.4 second denitrfying agent nozzles 6 that in V-type Benitration reactor 5, spray denitrfying agent are set at the compartment 5a top of V-type Benitration reactor 5.Denitrfying agent adopts liquefied ammonia, ammonia or urea liquid.
The first denitrfying agent nozzle 7 is connected with denitrfying agent supply pump 13 through denitrfying agent pipeline 12 with the second denitrfying agent nozzle 6.When pulverized-coal fired boiler 1 work, after boiler smoke 2 gets into boiler exhaust gas road 4, get into V-type Benitration reactor 5 with the tangential again, form one very strong flue gas eddy flow 2a.Spray into denitrfying agent at 4 first denitrfying agent nozzles 7 to 4 sides, boiler exhaust gas road; Or in V-type Benitration reactor 5, spray into denitrfying agent at 4 second denitrfying agent nozzles 6; Or spray into denitrfying agent simultaneously at above-mentioned two places; Denitrfying agent receives heating evaporation in high-temperature flue gas, and under cyclonic action, denitrfying agent and nitrogen oxide are fully mixed and carries out reduction reaction.
Adopt above-mentioned efficient denitrification apparatus; Denitrfying agent is heated, evaporates, spreads in 800-1100 ℃ of high-temperature flue gas; And under strong cyclonic action, denitrfying agent forms the aerosol post at the inner chamber of V-type Benitration reactor 5, and the nitrogen oxide in the flue gas can fully contact and mix with denitrfying agent aerosol post.The quick and reaction of nitrogen oxides of denitrfying agent meeting in the flue gas impels NOx to be reduced into nitrogen, thereby improves denitration efficiency.
Claims (5)
1. the efficient denitrification apparatus of a pulverized-coal fired boiler; Place the furnace outlet of pulverized-coal fired boiler (1) and the space between vertical well gas flue (8) pipe bundle heat exchanger; It is characterized in that: said denitrification apparatus adopts a V-type Benitration reactor (5); After being placed in second superheater (3), and there is a square compartment (5a) inside, and compartment (5a) place, right angle is provided with arc-shaped guide plate or is divided into hexagon and makes its smooth and easy transition; This V-type Benitration reactor (5) becomes the tangential to be connected with the boiler exhaust gas road (4) of pulverized-coal fired boiler (1); The bottom connects vertical well gas flue (8) pipe bundle heat exchanger, is provided with the first denitrfying agent nozzle (7) in both sides, said boiler exhaust gas road (4), on said V-type Benitration reactor (5), is provided with the second denitrfying agent nozzle (6).
2. the efficient denitrification apparatus of a kind of pulverized-coal fired boiler according to claim 1; It is characterized in that: there is a square compartment (5a) described V-type Benitration reactor (5) inside; Place, compartment right angle is provided with arc-shaped guide plate or is divided into hexagon and makes its smooth and easy transition, and the flue gas in the compartment forms two rightabout eddy current.
3. the efficient denitrification apparatus of a kind of pulverized-coal fired boiler according to claim 1 is characterized in that: the first denitrfying agent nozzle (7) that an injection denitrfying agent in boiler exhaust gas road (4) is set in the said boiler exhaust gas road (4) and the side of V-type Benitration reactor (5) porch at least.
4. the efficient denitrification apparatus of a kind of pulverized-coal fired boiler according to claim 1 is characterized in that: at the inner annular chamber top that forms of the compartment (5a) of said V-type Benitration reactor (5) second a denitrfying agent nozzle (6) that in V-type Benitration reactor (5), sprays denitrfying agent is set at least.
5. according to the efficient denitrification apparatus of claim 3 or 4 described a kind of pulverized-coal fired boilers, it is characterized in that: said denitrfying agent adopts liquefied ammonia, ammonia or urea liquid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205251135U CN202387364U (en) | 2011-12-15 | 2011-12-15 | Efficient denitrification device of pulverized coal boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205251135U CN202387364U (en) | 2011-12-15 | 2011-12-15 | Efficient denitrification device of pulverized coal boiler |
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| CN202387364U true CN202387364U (en) | 2012-08-22 |
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| CN2011205251135U Expired - Fee Related CN202387364U (en) | 2011-12-15 | 2011-12-15 | Efficient denitrification device of pulverized coal boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106422710A (en) * | 2016-11-17 | 2017-02-22 | 上海华之邦科技股份有限公司 | High-capacity denitration apparatus |
| CN109289573A (en) * | 2018-10-16 | 2019-02-01 | 中国华电科工集团有限公司 | A kind of gas mixer and method applied to denitrating system |
-
2011
- 2011-12-15 CN CN2011205251135U patent/CN202387364U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106422710A (en) * | 2016-11-17 | 2017-02-22 | 上海华之邦科技股份有限公司 | High-capacity denitration apparatus |
| CN109289573A (en) * | 2018-10-16 | 2019-02-01 | 中国华电科工集团有限公司 | A kind of gas mixer and method applied to denitrating system |
| CN109289573B (en) * | 2018-10-16 | 2024-04-05 | 中国华电科工集团有限公司 | Gas mixing device and method applied to denitration system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120822 Termination date: 20151215 |
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| EXPY | Termination of patent right or utility model |