CN103736394A - Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device - Google Patents
Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device Download PDFInfo
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- CN103736394A CN103736394A CN201410002603.5A CN201410002603A CN103736394A CN 103736394 A CN103736394 A CN 103736394A CN 201410002603 A CN201410002603 A CN 201410002603A CN 103736394 A CN103736394 A CN 103736394A
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Abstract
The invention provides a design method of a guide plate of a reducing flue of an SCR (selective catalytic reduction) de-nitration device. According to the method, the flue gas running through the reducing flue is divided by using the guide plate; the guide plate is arranged inside a horizontal reducing flue of the SCR de-nitration device; the guide plate changes the moving direction of fly ash particles in the reducing flue to avoid the local gathering of the fly ash particles; according to the length, inlet width and outlet width of the reducing flue, the structural parameter and the mounting position of the guide plate in the reducing flue are further determined; the structure parameter of the guide plate comprises number (n) of the guide plates, length (L) of the guide plate, distance (d) between the guide plates and included angle (theta) between the guide plate and the cross section of the inlet of the reducing flue. Due to the adoption of the design method, the evenness of the distribution of the fly ash particles is improved simultaneously when the distribution evenness of the flue gas speed can be met, and therefore, the partial gathering of the fly ash particles in the catalysis layer and the flush damage to a catalyst are avoided.
Description
Technical field
The present invention relates to a kind of SCR denitrification apparatus reducing flue deflector method for designing that is intended to nurse one's health fly ash granule distribution, belong to thermoelectricity environmental technology field.
Background technology
Denitration method for flue gas comprises SCR (SCR-Selective Catalytic Reduction) technology, SNCR (SNCR) technology, SNCR/SCR associating gas denitrifying technology, liquid absorption method etc.In existing thermoelectricity denitration method for flue gas, SCR denitration is high with its denitration efficiency, selectively good, running temperature is low etc., and advantage becomes the flue gases purification being most widely used.The cardinal principle of selective catalytic reduction is to utilize ammonia (NH
3) and nitrogen oxide (NO
x) at V
2o
5/ WO
3/ TiO
2or V
2o
5/ MoO
3/ TiO
2the redox reaction of carrying out under the effect of the catalyst forming, generates nitrogen (N
2) and water (H
2o), thus remove NOx harmful in flue gas.The deflector of SCR denitrification apparatus is used for regulating velocity of flue gas field and reductant concentration field, to control, catalyst inlet place velocity of flue gas distributes and reducing agent (ammonia) CONCENTRATION DISTRIBUTION is even as far as possible, as conventionally weighed the uniformity of velocity of flue gas distribution with the velocity of flue gas distribution relative standard deviation of ground floor catalyst inlet plane, and require this index to be less than 15%.
Yet, to there is the denitrification apparatus analysis of catalyst breakage accident, show, when flue gas fly ash content is higher, even if velocity of flue gas distribution consistency degree meets design requirement, in flue gas, the Local enrichment of the fly ash granule of uneven distribution also can cause catalyst structure damage, the service life of seriously having reduced catalyst.Therefore, for the grey extension set group of height, during design deflector, not only the VELOCITY DISTRIBUTION uniformity to be considered, also fly ash granule kinds of decentralized control problems will be considered.Specifically, because fly ash granule density is far above flue gas, under mobility status, there is the inertia larger than flue gas.When fly ash granule moves to reducing flue, being conventionally difficult to change fast the direction of motion, thereby leaving after reducing flue at flue gas, there is enrichment phenomenon in fly ash granule, after while being extended down to Catalytic Layer, the possibility of the high earthquake intensity erosion of local catalyst has just been increased.By reducing flue deflector is carried out to this enrichment phenomenon that appropriate design can be eliminated fly ash granule, reach the object that catalyst is lengthened the life.
The deflector that is used for controlling velocity of flue gas distribution consistency degree in engineering practice normally radius is R(R ≈ 600mm) the radian arcuate structure that is pi/2, and at the two ends of arc, tangentially connect the straight plate of prolongation of 100-300mm.To finding after existing technical literature retrieval, Mao Jianhong, Song Hao, Wu Weihong etc. have delivered " design and optimization of station boiler SCR denitrating system deflector " at < < journal of Zhejiang university (engineering version) > > (45 6 phases of volume in 2011).This article is analyzed and is studied the deflector design in denitrification apparatus, and deflector position, angle are optimized, thereby has improved catalyst inlet place velocity of flue gas and ammonia concentration distribution consistency degree.Yet this article is not is not analyzed and researched for the inner fly ash granule distribution situation of device, this factor is not considered in corresponding deflector design yet.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of SCR denitrification apparatus reducing flue deflector method for designing, under the prerequisite that the method meets design requirement at denitrification apparatus velocity of flue gas distribution consistency degree, improve the fly ash granule distribution consistency degree at catalyst inlet place, so that catalyst exempts from local excessive erosion, improve catalyst service life.
For realizing above object, the invention provides a kind of SCR denitrification apparatus reducing flue deflector method for designing, the method is cut apart the flue gas of the reducing flue of flowing through by deflector is set, described deflector is arranged on the horizontal reducing flue inside of SCR denitrification apparatus, this deflector changes the direction of motion of fly ash granule in reducing flue, avoids fly ash granule generation Local enrichment.
Preferably, the structural parameters of described deflector, comprise: deflector quantity n, deflector length L, deflector spacing d, deflector and reducing flue entrance cross section angle theta, these parameters according to the length of reducing flue, throat width, exit width by CFD(computational fluid dynamics) emulation optimizing obtains.
Preferably, described deflector is cut apart reducing flue, refers to: when deflector number is n, bend is divided into (n+1) individual passage, the width of each feeder connection is d
i(i=1,2 ..., n+1), i.e. spacing between two between deflector windward side end points.
Preferably, described deflector and reducing flue flue entrance section angle theta are the angles of each deflector place plane and reducing flue entrance cross section.
Preferably, described reducing flue is in horizontal or vertical flue, to play transition flue duct linking effect, that entrance is unequal with exit width, central axis does not overlap.
Preferably, described deflector is straight plate structure.
Compared with prior art, the present invention has following beneficial effect:
The present invention can improve the uniformity that Catalytic Layer plane of inlet fly ash granule distributes under velocity of flue gas distributes the prerequisite meeting design requirement, velocity of flue gas is distributed and is also improved effect simultaneously, thereby avoid fly ash granule at Catalytic Layer Local enrichment and the erosion damage to catalyst thereof, there is the effect that extends SCR denitrating system catalyst life, improves denitration efficiency.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is SCR denitrification apparatus structure of the present invention and reducing flue schematic diagram;
In figure: 1 is first directly curved, and 2 is the second straight curved deflector, and 3 is the 3rd straight curved deflector, and 4 is economizer, and 5 is SCR reactor, 6 be ammonia-spraying grid, mix grid, 7 is reducing flue deflector;
Fig. 2 is reducing flue deflector size schematic diagram of the present invention;
Fig. 3 when not installing reducing flue deflector additional, Catalytic Layer plane of inlet spike fly ash granule distribution map;
Fig. 4 is for installing additional after reducing flue deflector, Catalytic Layer plane of inlet spike fly ash granule distribution map.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
The present embodiment provides a kind of SCR denitrification apparatus reducing flue deflector method for designing for the conditioning of the fly ash granule uniformity, by deflector is set, the flue gas of the reducing flue of flowing through is cut apart, deflector changes the direction of motion of fly ash granule in reducing flue, avoids fly ash granule generation Local enrichment; According to the length of reducing flue, throat width, exit width, further determine reducing flue internal diversion plate structure parameter and installation site.
As shown in Figure 1, be certain coal-fired unit SCR denitrification apparatus structure and reducing flue schematic diagram, 1 is first directly curved, 2 is the second straight curved deflector, and 3 is the 3rd straight curved deflector, and 4 is economizer, 5 is SCR reactor, and 6 is ammonia-spraying grid, mixing grid, and 7 is reducing flue deflector; Wherein on the horizontal flue between economizer 4 and first straight curved 1, there is one section of reducing flue, it is reducing flue deflector 7 that this reducing flue adopts the designed deflector of the present invention, and all the other each straight curved flue places all adopt the arc deflector that the conventional radian of engineering is pi/2; Wherein:
Reducing flue deflector length is L
i(i=1,2).
Reducing flue entrance and exit width are respectively D
1, D
2, length is S, water conservancy diversion plate number is n(n>=1), the flue each several part width that deflector is partitioned into is d
i(i=1,2,3 ...), each deflector and reducing flue entrance cross section angle are θ
i(i=1,2 ...) size marking as shown in Figure 2.
Above-mentioned parameter n, L
i, d
i, θ
iby CFD(computational fluid dynamics) emulation optimizing obtains, wherein:
n=2；
D
1=10200mm，D
2=11880mm，S=2600mm；
L
1=1870mm，L
2=1870mm；
d
1=3675mm，d
2=3900mm，d
3=2625mm；
θ
1=43°，θ
2=40°。
In the present embodiment, economizer inlet flue gas speed 16m/s, spray ammonia speed 77m/s, exhanst gas outlet static pressure-1500Pa, Temperature Setting is 650K, Catalytic Layer plane of inlet is of a size of 10.70m x12.20m, meter 130.54m
2.Fluent6.3.26 software is used in CFD emulation, installs each bend position and uses the conventional deflector design of engineering.
In Fig. 1, SCR reactor, containing two-layer, adopts honeycombed catalyst, and the plane of inlet that flue gas enters SCR reactor is rectangle.
Fig. 3 is not when installing reducing flue deflector additional, and Catalytic Layer plane of inlet spike fly ash granule distribution map is overlooked, and left side is nearly boiler side, and flow of flue gas direction is pointed to paper by reader, and SCR reactor inlet flue is of a size of: left and right is to 10.70m, and front and back are to 12.20m.
When the trapezoidal reducing of horizontal flue place does not install deflector additional, catalyst inlet plane velocity of flue gas distribution relative standard deviation is 12.4%.And this position installs additional after deflector, corresponding velocity of flue gas distribution relative standard deviation reduces to 10.4%, and in above two kinds of situations, velocity of flue gas distribution relative standard deviation is all better than design standard (<15%), meets the requirement of the VELOCITY DISTRIBUTION uniformity.But from the angle of distribution of particles, while not installing deflector additional at trapezoidal reducing place, there is obvious enrichment phenomenon (as shown in Figure 3) in catalyst layer left side in the spike fly ash granule of catalyst upper surface; And at Catalytic Layer middle section, distribution of particles is very sparse.Further statistics shows, in the rectangle band of catalyst inlet plane left side 2m (rectangle band be Fig. 3 left margin to the region between dotted line, area is 2m x12.2m=24.40m
2, account for the plane of inlet gross area 18.69%), tracer grain density is 14.3/m
2, far above (6.4/m of plane of inlet tracer grain averag densities
2).Like this, the catalyst of this rectangular strip region will be subject to more strong Flying Ash Erosion, probably shortens the service life of catalyst.At reducing flue place, install after the deflector for distribution of particles, as shown in Figure 4, the tracer grain density of left side rectangle band is reduced to 6.9/m to the tracer grain distribution situation of respective cross-section
2, approaching averag density, tracer grain enrichment phenomenon disappears, and tracer grain is obviously tending towards evenly in the overall distribution of SCR reactor inlet plane, especially the sparse phenomenon of the particle of Fig. 3 middle section disappears.
Visible, at reducing flue, use the technology of the present invention can make the fly ash granule distribution consistency degree of Catalytic Layer porch get a promotion, eliminate particle in the Local enrichment phenomenon of Catalytic Layer porch, thereby the local Catalytic Layer excessive wear erosion of avoiding fly ash granule skewness to cause, plays the effect that catalyst is lengthened the life.Meanwhile, the technology of the present invention has also improved flue gas to a certain extent by the VELOCITY DISTRIBUTION uniformity of Catalytic Layer, is conducive to improve denitration efficiency.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (6)
1. a SCR denitrification apparatus reducing flue deflector method for designing, it is characterized in that, the method is cut apart the flue gas of the reducing flue of flowing through by deflector is set, described deflector is arranged on the horizontal reducing flue inside of SCR denitrification apparatus, this deflector changes the direction of motion of fly ash granule in reducing flue, avoids fly ash granule generation Local enrichment.
2. a kind of SCR denitrification apparatus reducing flue deflector method for designing according to claim 1, it is characterized in that, described deflector, its structural parameters comprise: deflector quantity n, deflector length L, deflector spacing d, deflector and reducing flue entrance cross section angle theta, these parameters obtain by CFD emulation optimizing according to the length of reducing flue, throat width, exit width.
3. a kind of SCR denitrification apparatus reducing flue deflector method for designing according to claim 2, it is characterized in that, described deflector is cut apart reducing flue, specifically refers to: when deflector number is n, bend is divided into (n+1) individual passage, the width of each feeder connection is d
i, i=1,2 ..., n+1,, i.e. spacing between two between deflector windward side end points.
4. a kind of SCR denitrification apparatus reducing flue deflector method for designing according to claim 2, is characterized in that, described deflector and reducing flue flue entrance section angle theta are the angles of each deflector place plane and reducing flue entrance cross section.
5. according to a kind of SCR denitrification apparatus reducing flue deflector method for designing described in claim 1-4 any one, it is characterized in that, described deflector is straight plate structure.
6. according to a kind of SCR denitrification apparatus reducing flue deflector method for designing described in claim 1-4 any one, it is characterized in that, described reducing flue is in horizontal or vertical flue, to play transition flue duct linking effect, that entrance is unequal with exit width, central axis does not overlap.
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| CN104307359A (en) * | 2014-10-24 | 2015-01-28 | 上海交通大学 | Flue gas denitration device for dispersing fly ash particles, and design method of diversion strip of flue gas denitration device |
| CN106984192A (en) * | 2017-04-24 | 2017-07-28 | 中国联合工程公司 | One kind coupling SCR denitration guiding device and structure |
| CN107748816A (en) * | 2017-10-19 | 2018-03-02 | 中冶华天工程技术有限公司 | A kind of Benitration reactor and its rack integral design method |
| CN108786460A (en) * | 2018-08-09 | 2018-11-13 | 国电龙源节能技术有限公司 | Coal-burning power plant's denitration ammonia-gas spraying device flow fieldoptimization system |
| CN112178667A (en) * | 2020-10-16 | 2021-01-05 | 南京博沃科技发展有限公司 | Ash field treatment structure for SCR outlet downstream heating surface |
| CN114028942A (en) * | 2021-12-01 | 2022-02-11 | 沈阳铝镁设计研究院有限公司 | Device and method for preventing SCR reactor from being blocked and catalyst from being poisoned |
| CN114950087A (en) * | 2022-05-18 | 2022-08-30 | 西安西热锅炉环保工程有限公司 | SCR denitration control system and method for ultralow nitrogen oxide emission |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104307359A (en) * | 2014-10-24 | 2015-01-28 | 上海交通大学 | Flue gas denitration device for dispersing fly ash particles, and design method of diversion strip of flue gas denitration device |
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| CN112178667A (en) * | 2020-10-16 | 2021-01-05 | 南京博沃科技发展有限公司 | Ash field treatment structure for SCR outlet downstream heating surface |
| CN112178667B (en) * | 2020-10-16 | 2022-03-22 | 南京博沃科技发展有限公司 | Ash field treatment structure for SCR outlet downstream heating surface |
| CN114028942A (en) * | 2021-12-01 | 2022-02-11 | 沈阳铝镁设计研究院有限公司 | Device and method for preventing SCR reactor from being blocked and catalyst from being poisoned |
| CN114950087A (en) * | 2022-05-18 | 2022-08-30 | 西安西热锅炉环保工程有限公司 | SCR denitration control system and method for ultralow nitrogen oxide emission |
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