CN205850590U - A kind of flue structure of effective elimination corner whirlpool - Google Patents
A kind of flue structure of effective elimination corner whirlpool Download PDFInfo
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- CN205850590U CN205850590U CN201620713891.XU CN201620713891U CN205850590U CN 205850590 U CN205850590 U CN 205850590U CN 201620713891 U CN201620713891 U CN 201620713891U CN 205850590 U CN205850590 U CN 205850590U
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- flue
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- whirlpool
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Abstract
The purpose of this utility model is to provide the flue structure of a kind of effective elimination corner whirlpool, it is located at SCR denitration reactor top to cut sth. askew the junction of flue and upstream flue, connects the SCR denitration reactor sidewall paneling near flue side, upstream and the base plate of upstream stack base；Including: a circular arc plate；Connect a upstream connecting plate of one end of this base plate and this circular arc plate, connect a downstream connecting plate of this sidewall paneling and this circular arc plate other end.This flue structure is possible not only to effectively to eliminate SCR reactor top and cuts sth. askew the flue severe whirlpool district with flue junction, upstream, and can improve the velocity distribution uniformity in first floor catalyst inlet cross section to a certain extent.
Description
Technical field
This utility model relates to gas denitrifying technology field, particularly relates to SCR system top and cuts sth. askew the flue structure of flue,
It is specifically related to the flue structure of a kind of effective elimination corner whirlpool.
Background technology
Along with the more attention of Environmental protection, the atmosphere pollutants emission standards in succession put into effect seems the tightest
Severe, the Air Pollutant Emission that wherein coal fired power plant is caused becomes the major issue that can not be ignored.SCR takes off
Nitre (SCR) technology has become the gas denitrifying technology of current China main flow, for ensureing to meet harsh discharged nitrous oxides standard,
Good in need to ensureing system ammonia nitrogen mixing equivalent proportion, in this guarantee system especially in first floor catalyst inlet cross section good
Velocity distribution uniformity there is pivotal role.
Limit because of site space condition etc., SCR system site layout project can exist flue is turned, flue is tapered or flaring etc.
Arrangement, these velocity of flue gas distributing homogeneities good in being all unfavorable for guarantee system.Especially flow through upstream at flue gas
When flue enters SCR reactor by flue of cutting sth. askew, tradition upstream flue and SCR reactor are by " L " shape L-square even
Connecing, research finds, when flue gas enters SCR reactor body, due to flow inertance effect, reactor is near upstream flue one
Side there will be obvious low regime, and high velocity, local then occurs in the opposite side of reactor, can be formed not when flue gas flows through herein
The whirlpool district of profit, the velocity distribution uniformity that above-mentioned service condition is poor in directly resulting in first floor catalyst inlet cross section.
Utility model content
For the problems referred to above, the purpose of this utility model is to provide the flue structure of a kind of effective elimination corner whirlpool,
This flue structure is possible not only to effectively to eliminate SCR reactor top and cuts sth. askew the flue severe whirlpool district with flue junction, upstream,
And the velocity distribution uniformity in first floor catalyst inlet cross section can be improved to a certain extent.
Technical solution adopted in the utility model is:
The flue structure of a kind of effective elimination corner whirlpool, is located at SCR denitration reactor top and cuts sth. askew flue and upstream cigarette
The junction in road, connects the SCR denitration reactor sidewall paneling near flue side, upstream and the base plate of upstream stack base；Bag
Include: a circular arc plate；Connect a upstream connecting plate of one end of this base plate and this circular arc plate, connect this sidewall paneling and this circular arc
One downstream connecting plate of the shape plate other end.
Further, the central angle of described circular arc plate is 90 °, and the span of radius is 200 to 800mm.
Further, described upstream connecting plate horizontal positioned, described downstream connecting plate is vertically placed.
Further, described circular arc steel plate, upstream connecting plate and downstream connecting plate are wide, and width and described sidewall paneling
Identical.
Further, the material of described circular arc steel plate, upstream connecting plate and downstream connecting plate is steel plate.
The beneficial effects of the utility model are:
The SCR system of the present utility model Flue duct design in flue of cutting sth. askew can effectively guide flue gas flow direction, by using
Quadrant arc steel plate replaces traditional " L " shape right angle steel plate, is effectively formed at elimination SCR reactor inlet position
Severe whirlpool district, and the velocity distribution uniformity in first floor catalyst inlet cross section can be improved to a certain extent, thus promote
The denitration performance of SCR system.
Accompanying drawing explanation
Fig. 1 is the installation site signal of the flue structure effectively eliminating corner whirlpool in this utility model one embodiment
Figure.
Fig. 2 is the close-up schematic view in Fig. 1 at A.
Fig. 3 is the Flow Field Distribution performance plot of the denitration reaction system using traditional " L " shape steel square board connecting structure.
Fig. 4 is the denitration of the flue structure effectively eliminating corner whirlpool of the description in application this utility model one embodiment
The Flow Field Distribution performance plot of response system.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the utility model will be further described:
In practical implementation one embodiment, as a example by thinking certain 2 × 330MW coal unit SCR denitration system, say
Bright, every coal-burning boiler has been arranged symmetrically with A, B two at its economizer exit and has overlapped SCR flue gas denitrification system, with this unit A side
SCR denitration system is object of study, and carries out corresponding Computational fluid mechanics numerical simulation research, involved SCR reactor cross section chi
Very little it is: wide 9.25m, deep 9.73m.
As it is shown in figure 1, the flue structure effectively eliminating corner whirlpool in the present embodiment, it is located on SCR denitration reactor
Cutting sth. askew the junction of flue and upstream flue in portion, connects the SCR denitration reactor sidewall paneling near flue side, upstream and upstream
The base plate of stack base；Including: circular arc plate 2；Connect a upstream connecting plate 1 of one end of this base plate and circular arc plate 2, connect
This sidewall paneling and a downstream connecting plate 3 of this circular arc plate other end.
Circular arc plate is quarter circular arc, and central angle is 90 °, and the value of this quarter circular arc radius R is 200mm.
Wherein, the span of the radius of circular arc plate is not limited to 200mm, in other embodiments, and can be according to the specification of SCR reactor
Choose from 200 to 800mm.Special instruction, radius is less than 200mm, then may unavailable preferable elimination corner cyclonic effect.
Described circular arc plate, upstream connecting plate and downstream connecting plate run through whole flue when arranging.
Found by numerical simulation study in the present embodiment, when SCR reactor flue inside turn flue of cutting sth. askew uses and passes
During " L " the shape L-square united, on the left of reactor, occur in that (zone velocity having nearly 1/5th is less than 4m/ in obvious low regime
S), then there is high velocity, local (locally cigarette more than scooter 8m/s) in right side, defines disadvantageous whirlpool when flue gas flows through herein
District's (as shown in Figure 2), the VELOCITY DISTRIBUTION deviation being computed now reactor inlet cross section is about 18.03%, is unsatisfactory for engineering and sets
Meter index.
Based on the flue structure effectively eliminating corner whirlpool described in previous embodiment, use circular arc plate and two panels straight
The mode of plate combination replaces traditional " L " shape right angle steel plate to arrange, the numerical simulation result after having transformed finds and conventional junction
Structure is compared, and almost vanish from sight (as shown in Figure 3) in the whirlpool district at improvement project SCR reactor inlet, reactor left field
Speed also improves.The VELOCITY DISTRIBUTION deviation being computed now reactor inlet cross section is about reduced to 14.91%, this explanation
The Flue duct design that this utility model patent is announced can effectively eliminate the corner whirlpool of SCR reactor inlet position, and energy
Enough velocity distribution uniformity improving first floor catalyst inlet cross section to a certain extent.
It addition, in order to ensure structural stability, can be as required at circular arc steel plate, upstream connecting plate and downstream connecting plate
Outside arrange some reinforcement (not shown), reinforcement be sector or bar shaped.
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 (6)
1. the flue structure of an effective elimination corner whirlpool, it is characterised in that be located at SCR denitration reactor top and cut sth. askew flue
With the junction of upstream flue, connect the SCR denitration reactor sidewall paneling near flue side, upstream and upstream stack base
Base plate；Including: a circular arc plate；Connect a upstream connecting plate of one end of this base plate and this circular arc plate, connect this sidewall paneling
And a downstream connecting plate of this circular arc plate other end.
2. the flue structure effectively eliminating corner whirlpool as claimed in claim 1, it is characterised in that the circle of described circular arc plate
Heart angle is 90 °, and the span of radius is 200 to 800mm.
3. the flue structure effectively eliminating corner whirlpool as claimed in claim 2, it is characterised in that the half of described circular arc plate
Footpath is 200 mm.
4. the flue structure effectively eliminating corner whirlpool as claimed in claim 1, it is characterised in that described upstream connecting plate water
Placing flat, described downstream connecting plate is vertically placed.
5. the flue structure effectively eliminating corner whirlpool as claimed in claim 4, it is characterised in that described circular arc steel plate,
Upstream connecting plate and downstream connecting plate are wide, and width is identical with described sidewall paneling.
6. the flue structure effectively eliminating corner whirlpool as claimed in claim 1, it is characterised in that described circular arc steel plate,
The material of upstream connecting plate and downstream connecting plate is steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620713891.XU CN205850590U (en) | 2016-07-07 | 2016-07-07 | A kind of flue structure of effective elimination corner whirlpool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620713891.XU CN205850590U (en) | 2016-07-07 | 2016-07-07 | A kind of flue structure of effective elimination corner whirlpool |
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| Publication Number | Publication Date |
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| CN205850590U true CN205850590U (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620713891.XU Active CN205850590U (en) | 2016-07-07 | 2016-07-07 | A kind of flue structure of effective elimination corner whirlpool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823792A (en) * | 2017-03-31 | 2017-06-13 | 华能国际电力股份有限公司玉环电厂 | Full load SCR flue gas denitrification systems |
| CN108187493A (en) * | 2018-03-02 | 2018-06-22 | 上海电气电站环保工程有限公司 | A kind of flue structure optimum design method for reducing SCR denitration device crushing |
-
2016
- 2016-07-07 CN CN201620713891.XU patent/CN205850590U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823792A (en) * | 2017-03-31 | 2017-06-13 | 华能国际电力股份有限公司玉环电厂 | Full load SCR flue gas denitrification systems |
| CN106823792B (en) * | 2017-03-31 | 2023-09-26 | 华能国际电力股份有限公司玉环电厂 | Full-load SCR flue gas denitration system |
| CN108187493A (en) * | 2018-03-02 | 2018-06-22 | 上海电气电站环保工程有限公司 | A kind of flue structure optimum design method for reducing SCR denitration device crushing |
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