CN101306325A - Flue gas even distribution device of selective catalytic reduction reaction denitration reactor - Google Patents
Flue gas even distribution device of selective catalytic reduction reaction denitration reactor Download PDFInfo
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- CN101306325A CN101306325A CNA2008101162101A CN200810116210A CN101306325A CN 101306325 A CN101306325 A CN 101306325A CN A2008101162101 A CNA2008101162101 A CN A2008101162101A CN 200810116210 A CN200810116210 A CN 200810116210A CN 101306325 A CN101306325 A CN 101306325A
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Abstract
The invention provides an economical, safe and reliable flue gas even distribution device for a denitrification reactor used for selective catalytic reduction reaction. The flue gas even distribution device of the invention is arranged at the elbow part of a flue above a catalyst bed layer for carrying out flow guide and even distribution to flue gas, the flue gas even distribution device is composed of a flow guide plate group (5), the flow guide plate group comprises a plurality of flow guide plates which are arranged along the central line of a corner of the elbow of the flue, the interval between the adjacent flow guide plates is in the range of 300 to 400nm, each flow guide plate is composed of two straight plates, wherein, one straight plate is horizontally arranged, the other straight plate is intersected with the horizontal straight plate with an angle within the range of 90 degrees to 105 degrees and downwards extended, and the flue gas which flows from the flue gas even distribution device directly enters the catalyst bed layer.
Description
Technical field
The present invention relates to a kind of flue gas even distribution device, relate more particularly to a kind of flue gas even distribution device that is used for the selective catalytic reduction reaction denitration reactor of station boiler, combined cycle system waste heat boiler etc.
Background technology
SCR (SCR) gas denitrifying technology is putative denitrating flue gas mainstream technology, is widely used in the purified treatment of all types of power plant boiler flue gases.A kind of SCR technological process is: reducing agent (ammonia) is used canned truck transport, is stored in the ammonia jar with liquid form; Liquid ammonia gasified via evaporator evaporation before injecting SCR system flue gas; The ammonia of gasification and diluent air mix, and spray into by ammonia-spraying grid in the flue gas of SCR reactor upstream; Abundant mixed reducing agent and flue gas react in the SCR reactor, remove NOx.
Guarantee catalytic effect, key factor is that velocity field is even when making the flue gas that fully mixes with reducing agent enter the reactor catalyst bed, and velocity of flue gas vector and the bed quadrature of trying one's best.In view of this point, at present designs that adopt deflector to add cowling panel (flow straightening grid) more.As shown in Figure 1, in the SCR of prior art flue gas denitrification system, the flue gas of station boiler etc. enters Benitration reactor 1 through economizer, the flue gas that mixes with reducing agent enters cowling panel 3 through traditional deflector 2 water conservancy diversion, through this process, flue gas enters beds 4 with even velocity field comparatively.
The purpose that cowling panel is set above beds be for the velocity field that makes flue gas evenly and make the ash in the flue gas vertical by catalyst surface (drift angle＜15 degree), the modular design of cowling panel is the wide 75mm in hole, high 500mm, be preferably 1500mm with interlamellar spacing on the flue, to realize the current-sharing of dust and flue gas.
If above the ground floor catalyst in Benitration reactor cowling panel is installed as mentioned above, flue gas this plate of flowing through then, velocity field is comparatively even, but because the cowling panel perforate is intensive, and make that system's crushing is bigger, can directly cause the denitrating system power consumption higher, in addition, cowling panel is in case stifled grey, and crushing will sharply raise, it will be extremely inhomogeneous that air-flow distributes, and have a strong impact on the denitration efficiency of reactor.And if stifled ash is serious, then the boiler malleation can cause tripping operation.
Summary of the invention
The objective of the invention is to overcome the shortcoming of existing flue gas even distribution device, the flue gas even distribution device of a kind of economy and safe and reliable selective catalytic reduction reaction denitration reactor is provided.
To achieve these goals, the invention provides a kind of flue gas even distribution device that is used for selective catalytic reduction reaction denitration reactor, it is arranged on the smoke canal elbow place of beds top, flue gas is carried out water conservancy diversion and uniform, it is characterized in that, described flue gas even distribution device is made of the deflector group, described deflector group comprises a plurality of deflectors of arranging along the corner-centric line of described smoke canal elbow, interval between the adjacent baffle is in the scope of 300～400mm, each deflector is made up of two blocks of straight plates, wherein a straight plate level is furnished, straight plate of another piece and straight horizontal plate are with angle of intersection in 90 °～105 ° the scope and extension downwards, and the flue gas that flows out from flue gas even distribution device directly enters beds.
Thus, replaced deflector of the prior art to add the cowling panel scheme, thereby reduced the crushing in the denitrating system, reduced the power consumption of system with the deflector group.And the cowling panel that is arranged on the beds top in the deflector group that is arranged on the smoke canal elbow place and the prior art is compared, and the possibility of stifled ash reduces, thereby can improve the security of reactor operation.And the interval between the adjacent baffle is in the scope of 300～400mm, so can obtain optimum flue gas even distribution effect, thereby collect acting on all over the body of traditional deflector and cowling panel when suppress crushing and increasing.Like this, the flue gas that flows out from flue gas even distribution device directly enters beds, has saved cowling panel, so reduced the cost of Benitration reactor.And being made as the straight horizontal plate by a straight plate that will constitute deflector, the straight plate of another piece and this straight horizontal plate can make the velocity of flue gas vector vertical substantially with beds with the angle of intersection in 90 °～105 ° the scope, the catalytic effect of realizing ideal.
Preferably, the structure of each deflector and measure-alike.Like this, the deflector standardization can be helped the production in enormous quantities of deflector, thereby further reduces cost.
More preferably, the polylith deflector is evenly arranged with equal intervals.Like this, can further strengthen the flue gas even distribution effect.
Description of drawings
Fig. 1 represents that existing deflector adds the cowling panel scheme.
Fig. 2 represents deflector prescription case of the present invention.
Fig. 3 is the velocity field cloud atlas when using flue gas even distribution device of the present invention.
Description of reference numerals
1 Benitration reactor, 2 traditional deflectors, 3 cowling panels, 4 beds, 5 deflector groups.
The specific embodiment
Below in conjunction with accompanying drawing preferred implementation of the present invention is described.
As shown in Figure 2, in flue gas even distribution device of the present invention, replaced traditional deflector 2 with deflector group 5 and added cowling panel 3 schemes.After flue gas enters Benitration reactor 1, at first flow through deflector group 5, directly flow through beds 4 afterwards.
In addition, the quantity of the deflector just interval between the adjacent baffle affects the crushing and the performance of reactor, and quantity is many more, and more little at interval, then crushing is big more, otherwise quantity is very few, and is excessive at interval, then do not have the effect of uniform flue gas.At this point, the inventor by the interval between the adjacent baffle being set in the scope of 300～400mm, can suppress to realize comparatively desirable flue gas even distribution effect when crushing increases through discovering.The interval here is meant adjacent baffle summit (intersection points of two blocks of straight plates) distance each other separately.Because under different engineering specifications, the size of reactor and flue and the kind of flue gas and speed etc. are all different, so concrete interval numerical value is determined after can utilizing Fluid Computation software according to concrete project situation simulative optimization.
In the present embodiment, each deflector evenly arranges with equal intervals, but also can make the interval difference between each deflector as required, for example broadens gradually to curved interior from curved interior.
Like this, compare with traditional deflector, the interval between the adjacent baffle of above-mentioned deflector group is little a lot, therefore also this deflector group can be called intensive deflector group.
Thus, deflector group 5 has played the effect of water conservancy diversion and rectification simultaneously.That is, because each deflector is made of two blocks of straight plates arranging with 90 °～105 ° angle of intersection, so after upstream side flows through the guiding that the flue gas that comes is subjected to deflector, flow out towards beds.Particularly, in 90 °～105 ° scope, select only angle by concrete condition according to the denitration engineering, can make the flue gas vector that flows out from deflector group 5 and perpendicular to the angle between the direction of beds less than 15 °, realize the highest reactor efficiency.
Velocity field cloud atlas when Fig. 3 shows the flue gas even distribution device that application designs as mentioned above.Can clearly be seen that from this figure in the downstream of flue gas even distribution device, the velocity field of flue gas distributes very even.And the velocity of flue gas vector is basically perpendicular to beds, thereby can expect the catalytic effect of realizing ideal.
Claims (3)
1. flue gas even distribution device that is used for selective catalytic reduction reaction denitration reactor is arranged on the smoke canal elbow place of beds top, and flue gas is carried out water conservancy diversion and uniform, it is characterized in that,
Described flue gas even distribution device is made of the deflector group, and described deflector group comprises a plurality of deflectors of arranging along the corner-centric line of described smoke canal elbow, the interval between the adjacent baffle in the scope of 300～400mm,
Each deflector is made up of two blocks of straight plates, and wherein a straight plate level is furnished, and straight plate of another piece and straight horizontal plate also extend downwards with the angle of intersection in 90 °～105 ° the scope,
The flue gas that flows out from flue gas even distribution device directly enters beds.
2. flue gas even distribution device as claimed in claim 1 is characterized in that, the structure of each deflector and measure-alike.
3. flue gas even distribution device as claimed in claim 1 is characterized in that, described a plurality of deflectors are evenly arranged with equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101162101A CN101306325A (en) | 2008-07-07 | 2008-07-07 | Flue gas even distribution device of selective catalytic reduction reaction denitration reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101162101A CN101306325A (en) | 2008-07-07 | 2008-07-07 | Flue gas even distribution device of selective catalytic reduction reaction denitration reactor |
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| CN101306325A true CN101306325A (en) | 2008-11-19 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101642678B (en) * | 2009-08-28 | 2011-08-17 | 中电投远达环保工程有限公司 | Cascading type rectifier used for SCR denitration device |
| CN101766950B (en) * | 2008-12-30 | 2011-10-05 | 上海电气石川岛电站环保工程有限公司 | Flue gas flow equalizing and guiding assembly of selective catalyctic reduction (SCR) denitration reactor inlet |
| CN102228793A (en) * | 2011-05-04 | 2011-11-02 | 上海电气石川岛电站环保工程有限公司 | Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device |
| CN103736394A (en) * | 2014-01-02 | 2014-04-23 | 上海交通大学 | Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device |
| CN105152825A (en) * | 2015-10-16 | 2015-12-16 | 中国矿业大学 | Compressed gas generation device based on single-component propellant catalytic decomposition |
| 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 |
| CN111921373A (en) * | 2020-08-11 | 2020-11-13 | 福建龙净环保股份有限公司 | Flue gas cooperative purification system and flue gas cooperative purification method |
| CN113477073A (en) * | 2021-05-31 | 2021-10-08 | 四川思达能环保科技有限公司 | Catalyst air inlet structure for dedusting and denitration device |
-
2008
- 2008-07-07 CN CNA2008101162101A patent/CN101306325A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101766950B (en) * | 2008-12-30 | 2011-10-05 | 上海电气石川岛电站环保工程有限公司 | Flue gas flow equalizing and guiding assembly of selective catalyctic reduction (SCR) denitration reactor inlet |
| CN101642678B (en) * | 2009-08-28 | 2011-08-17 | 中电投远达环保工程有限公司 | Cascading type rectifier used for SCR denitration device |
| CN102228793A (en) * | 2011-05-04 | 2011-11-02 | 上海电气石川岛电站环保工程有限公司 | Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device |
| CN102228793B (en) * | 2011-05-04 | 2013-07-03 | 上海电气石川岛电站环保工程有限公司 | Rectification grille for protecting fly ash particles on catalyst layer of SCR (Semiconductor Control Rectifier) denitration device |
| CN103736394A (en) * | 2014-01-02 | 2014-04-23 | 上海交通大学 | Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device |
| CN103736394B (en) * | 2014-01-02 | 2017-08-01 | 上海交通大学 | A kind of SCR denitration device reducing flue deflector design method |
| CN105152825A (en) * | 2015-10-16 | 2015-12-16 | 中国矿业大学 | Compressed gas generation device based on single-component propellant catalytic decomposition |
| 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 |
| CN106984192B (en) * | 2017-04-24 | 2022-11-25 | 中国联合工程有限公司 | Coupling SCR denitration guiding device and structure |
| CN111921373A (en) * | 2020-08-11 | 2020-11-13 | 福建龙净环保股份有限公司 | Flue gas cooperative purification system and flue gas cooperative purification method |
| CN113477073A (en) * | 2021-05-31 | 2021-10-08 | 四川思达能环保科技有限公司 | Catalyst air inlet structure for dedusting and denitration device |
| CN113477073B (en) * | 2021-05-31 | 2023-10-03 | 四川思达能环保科技有限公司 | Catalyst air inlet structure for dedusting and denitration device |
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Open date: 20081119 |