CN205850600U - A kind of guiding device in AIG downstream turning flue - Google Patents
A kind of guiding device in AIG downstream turning flue Download PDFInfo
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- CN205850600U CN205850600U CN201620406566.9U CN201620406566U CN205850600U CN 205850600 U CN205850600 U CN 205850600U CN 201620406566 U CN201620406566 U CN 201620406566U CN 205850600 U CN205850600 U CN 205850600U
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- deflector
- aig
- segmental arc
- flue
- downstream
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Abstract
This utility model provides the guiding device in a kind of AIG downstream turning flue, is installed in SCR system AIG downstream turning flue, and engine general arrangement mode is the arc straight type equidistant radial arrangement of deflector.Described arc straight type baffle quantity is no less than three, structural shape is completely the same, and its segmental arc deflector institute is 85 105 ° to center of circle angle, and segmental arc radius is between 1000mm～2000mm, after straight section deflector is connected to segmental arc deflector, its development length is less than 500mm.The Flow Field Distribution uniformity in SCR system AIG downstream turning flue can be effectively improved, contribute to improving the denitration performance of SCR system.
Description
Technical field
This utility model relates to the guiding device in a kind of AIG downstream turning flue, it is possible to is effectively improved AIG downstream and turns
Flue flow field distributing homogeneity.Belong to coal-fired flue gas denitration technical field.
Background technology
Nitrogen oxides (NOx) discharge that coal fired power plant is caused has become a problem that can not be ignored, selective catalysis
Reduction denitration (SCR) technology has become domestic and international coal unit based on advantages such as its technology maturation, denitration performance are superior and has generally adopted
Gas denitrifying technology.Reducing agent is sufficiently mixed with flue gas after ammonia-spraying grid AIG ejects, and subsequently enters catalyst layer and sends out
Biochemical reaction, because of catalyst activity limit, too high flue gas flow rate it cannot be guaranteed that reaction fully carry out, therefore need to guarantee be
Good velocity distribution uniformity is maintained in system.
Because the condition such as arrangement space, construction cost limits, Present Domestic main flow SCR system all have employed " U " type and arranges
Mode, during i.e. reducing agent sprays into flue gas after, right-angled bend flue can be flowed through subsequently.Affected by factors such as inertia, be doped with reduction
After the flue gas of agent flows through AIG downstream turning flue, its Flow Field Distribution uniformity is poor, is unfavorable for that what SCR denitration reacted efficiently enters
OK.Therefore, it is highly desirable to use certain flow fieldoptimization measure to improve the Flow Field Distribution in this flue.
Utility model content
For the problems referred to above, the purpose of this utility model is to provide the guiding device in a kind of AIG downstream turning flue,
By by straight for the arc equidistant radial arrangement of type deflector, the Flow Field Distribution uniformity in AIG downstream turning flue can be effectively improved,
Contribute to improving the denitration performance of SCR system.
The technical scheme in the invention for solving the technical problem is:
A kind of guiding device in AIG downstream turning flue, including: it is installed in SCR system AIG downstream turning flue,
At least three arcs straight type deflector of equidistant radial arrangement.
Further, every described arc straight type deflector includes a segmental arc deflector and a straight section deflector, described directly
Section deflector is connected along the tangential of described segmental arc deflector with segmental arc deflector.
Further, described segmental arc deflector is 85-105 ° to center of circle angle, preferably 90 °, segmental arc radius between
Between 1000mm～2000mm.
Further, described straight section deflector length is less than 500mm.
Further, the arrangement pitch of described arc straight type deflector is not less than 700mm.
The beneficial effects of the utility model are:
The baffle arrangement in a kind of AIG downstream turning flue disclosed in the present utility model, it is possible to be effectively improved
Flow Field Distribution uniformity in AIG downstream turning flue, promotes the denitration performance of SCR system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the guiding device in this utility model one embodiment in AIG downstream turning flue.
Fig. 2 is the structural representation of arc straight type deflector in this utility model one embodiment.
Fig. 3 is the stream in the guiding device rear pass that this utility model is installed in an embodiment in AIG downstream turning flue
Field distribution characteristic figure.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the utility model will be further described:
The present embodiment is applied in certain 2 × 660MW coal unit SCR system, and this coal unit is total at economizer exit
Arrange two set SCR system, the present embodiment is only installed this unit wherein side SCR system.SCR system ammonia-spraying grid in embodiment
AIG position flue lateral cross-sectional dimension is 14100mm × 2900mm.Reducing agent enters flue after AIG sprays, and depends on subsequently
Secondary flow through AIG mixing tube and downstream turning flue.Its structural representation is as it is shown in figure 1, AIG downstream turning flue in this enforcement
Interior guiding device includes: is installed in SCR system ammonia-spraying grid AIG3 downstream turning flue 2, the most radially arranges
Three arc straight type deflectors 1.
The Flow Field Distribution in SCR system AIG downstream turning flue can be optimized, at this by these three arc straight type deflectors
In embodiment, the spacing of arranged arc straight type deflector 1 radial arrangement is 725mm.The structure of three arc straight type deflectors 1,
Pattern and size are completely the same.Certainly, aforementioned arrangement spacing is only applicable to the present embodiment, at other embodiments or application scenarios
In, arrangement pitch need to determine according to the quantity of SCR system flue structure size and arc straight type deflector is collaborative, and ensures to be arranged
AIG downstream flue is divided equally by arc straight type deflector.It is to say, different according to flue specification, the number of arc straight type deflector
Amount is also optional, typically will not be less than three.
As in figure 2 it is shown, arc straight type deflector 1 includes segmental arc deflector 11 and straight section deflector 12, straight section deflector 12
Arcuately the tangential of section deflector 11 is connected with segmental arc deflector 11.
Wherein, segmental arc deflector 11 be 90 ° to center of circle angle, segmental arc radius is 1250mm.In other embodiments
Or in other applied environments, segmental arc deflector is chosen as 85-105 ° to center of circle angle, segmental arc radius can between
Choose between 1000mm～2000mm.
Straight section deflector 12 is solderable be connected to segmental arc deflector 11 after, its development length is 200mm.Implement at other
In example or other applied environments, the length of straight section deflector also can chosen less than in the range of 500mm.It addition, straight section
The processing modes such as deflector 12 and segmental arc deflector 11 can also be one-body molded, by casting, forge, mold pressing obtain.For protecting
Card arc straight type deflector has sufficient intensity, and thickness is typically selected from 3-8mm, and material selects high strength stainless steel, corrosion resisting alloy
Or composite.Carbon steel material outsourcing line with rubber layer or frp layer can also be used.
In the present embodiment, three arc straight type deflectors run through whole flue, and the longitudinal direction of i.e. three arc straight type deflectors is deep
Degree is 14100mm.
Based on the guiding device technical parameter in the AIG downstream turning flue described in above example carry out Numerical-Mode
Draft experiment, through above-mentioned three arc straight type baffle arrangement, the VELOCITY DISTRIBUTION of AIG downstream turning flue shows good uniform
Property, as shown in Figure 2.Arranged arc straight type deflector can preferably guide flue gas flow direction.Numerical result shows, adulterates
VELOCITY DISTRIBUTION deviation after the flue gas of reducing agent flows through AIG downstream turning flue is about 19.54%, and velocity distribution uniformity is more existing
The improvement having had flue by a relatively large margin, contributes to promoting the denitration efficiency of SCR system.
Further, since arc straight type deflector structure, pattern and size are completely the same, can make in batch, there is exchange
Property, beneficially popularization and application, and it is applicable to carry out the transformation of extensive existing equipment, there is good economic performance.
The foregoing is only preferred embodiment of the present utility model, be not whole embodiment of the present utility model,
Not in order to limit this utility model, all within spirit of the present utility model and principle, any amendment of being made, equivalent,
Improve, within should be included in protection domain of the present utility model.
In addition to technical characteristic described in description, remaining technical characteristic is all known to a person skilled in the art technology.
Claims (3)
1. the guiding device in AIG downstream turning flue, is installed in SCR system AIG downstream turning flue, and its feature exists
In, including at least three arcs straight type deflector of equidistant radial arrangement；The arrangement pitch of each arc straight type deflector is not less than
700mm, every described arc straight type deflector includes a segmental arc deflector and a straight section deflector, described segmental arc deflector institute
Center of circle angle is 85-105 °；Described segmental arc radius is between 1000mm～2000mm；Described straight section deflector length is not
More than 500mm.
2. the guiding device in turning flue in AIG downstream as claimed in claim 1, it is characterised in that described straight section deflector
Tangential along described segmental arc deflector is connected with segmental arc deflector.
3. the guiding device in turning flue in AIG downstream as claimed in claim 1, it is characterised in that described segmental arc water conservancy diversion
Plate institute is 90 ° to center of circle angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620406566.9U CN205850600U (en) | 2016-05-06 | 2016-05-06 | A kind of guiding device in AIG downstream turning flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620406566.9U CN205850600U (en) | 2016-05-06 | 2016-05-06 | A kind of guiding device in AIG downstream turning flue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205850600U true CN205850600U (en) | 2017-01-04 |
Family
ID=57643697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620406566.9U Active CN205850600U (en) | 2016-05-06 | 2016-05-06 | A kind of guiding device in AIG downstream turning flue |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205850600U (en) |
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2016
- 2016-05-06 CN CN201620406566.9U patent/CN205850600U/en active Active
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| C14 | Grant of patent or utility model | ||
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