CN201244443Y - Device for even distribution of pneumatic flow field - Google Patents
Device for even distribution of pneumatic flow field Download PDFInfo
- Publication number
- CN201244443Y CN201244443Y CNU2008203018948U CN200820301894U CN201244443Y CN 201244443 Y CN201244443 Y CN 201244443Y CN U2008203018948 U CNU2008203018948 U CN U2008203018948U CN 200820301894 U CN200820301894 U CN 200820301894U CN 201244443 Y CN201244443 Y CN 201244443Y
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- gas
- flue
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- bend
- curved arc
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Abstract
The utility model relates to an aerodynamic flow-field evenly distributed device, comprising an inlet flue-gas duct communicated with the top part of a reactor, a curved duct, a vertical flue duct and a guide component arranged in the curved duct. The guide component is a group of curved arch guide plates which are arrayed in turn along the radius of the curved duct from the inner side of the curved duct to the outer side of the curved duct; a flue-gas channel is left between the adjacent curved arch guide plates; one end, from which the flue gas enters, of the flue-gas channel is a gas inlet, and the other end, from which the flue gas is discharged, of the flue-gas channel is a gas outlet; the distance between the gas inlets is more than the corresponding distance between the gas outlets, and increases gradually from the inner side of the curved duct to the outer side of the curved duct; the two ends of each curved arch guide plate are connected with the inner walls at the two sides of the curved duct, and the radian of the curved duct is 90 degrees to150 degrees. The guiding device has simple structure and low cost and can be adjusted easily; when being used in an SCR flue-gas denitration system, the utility model can improve the even distribution of the flue gas in the system, so as to increase the denitration rate greatly.
Description
Technical field
The utility model relates to a kind of guiding device of fluid, particularly a kind of guiding device that is used for thermal power plant SCR (SCR) flue gas denitrification system adjusting flue gas flow field.
Background technology
In the combustion process of electric boiler, can produce with NO and NO
2Be the nitrogen oxide (hereinafter to be referred as NOx) of main component, to atmosphere, NOx is a kind of environmentally harmful material with flue gas row.SCR (SCR) technology is the present industrial a kind of denitration technology that is most widely used, and this technology is in the negative reaction device of a steel construction, sprays into reducing agent NH in flue gas
3, after mixed flue gas enters vertical gas pass, go into horizontal flue through turning around a curve is laggard, turn to the back runner to broaden through SCR reactor top converging transition, arrive first catalyst layer inlet section in the reactor downwards.Contain NOx, NH
3Flue gas by reactor, reduction reaction takes place in catalyst layer, the NO in the flue gas
XChange harmless N into
2And H
2O is to remove NO
X, satisfy strict day by day environmental requirement.
The key of SCR technology is that the even flow field of ground floor catalyst surface distributes, i.e. air velocity size, direction substantially evenly (deviation is in ± 15%), and the inhomogeneous meeting that flue gas flow field distributes causes the decline of SCR systematic function.
Conventional method is at the turning of flue gas flow channel diversion member to be set, but this method exists the some shortcomings part, only simply considered to reduce the resistance that air-flow is turned, and do not consider influence to the subsequent catalyst surface flow field, be not enough to guarantee the even distribution in the first catalyst layer surface flow field.
The utility model content
For addressing the above problem, the utility model provides a kind of pneumatic flow field equally distributed device, adopt one group of curved arc shape deflector simple in structure, that science is arranged, is easy to regulate, guaranteed the even distribution of flow field in first catalyst layer surface, make flue gas flow velocity equilibrium, even flow field in the SCR system, system's denitration efficiency is stable.
The technical scheme that its technical problem that solves the utility model adopts is:
The equally distributed device in a kind of pneumatic flow field, comprise the gas approach that is communicated with reactor head, bend, vertical gas pass and the diversion member that places in the bend, it is characterized in that: described diversion member is one group of curved arc shape deflector that is arranged in order along turning radius to the bend outside from curve inner side, leave the exhaust gases passes gap between the adjacent curved arc shape deflector, the end that flue gas enters exhaust gases passes is an air inlet, the end that flue gas flows out exhaust gases passes is the gas outlet, the air inlet spacing is all greater than corresponding gas outlet spacing with it, and the gas outlet spacing increases to the bend outside gradually from curve inner side, the two ends of each curved arc shape deflector are connected with bend both sides inwall, and the radian of above-mentioned bend is 90 degree-150 degree.
Above-mentioned curved arc shape deflector can be resistant to elevated temperatures metal or nonmetallic materials.
The sheet number of above-mentioned curved arc shape deflector can be 3-20.
The two ends of above-mentioned each curved arc shape deflector can be connected with the connector of both sides, and the connector by both sides is connected with bend both sides inwall.
The stage casing of above-mentioned each curved arc shape deflector can connect supporter.
The utility model utilizes fluid mechanics principle, utilize one group of curved arc shape deflector to make air-flow be evenly distributed on the reactor top, the result of Bu Zhiing makes the air-flow of D1 with higher flow rate and direction SCR reactor inlet section far-end like this, reduced the exhaust gas volumn that near-end (X) is located, the air-flow of Dn then flows with lower gas speed, reduced the exhaust gas volumn of arrival far-end (Y), air-flow is evenly distributed on SCR reactor top, has avoided too much near-end that concentrates on reactor inlet and far-end.Flue gas by flow straightening grid, is adjusted flue gas flow direction and flow velocity at last once more, has guaranteed to arrive the even distribution of first catalyst layer inlet section each point flue gas stream in the reactor.
The utility model can be regulated flue gas flow field distribution in the SCR flue gas denitrification system flue, guarantee under each operating mode, SCR reactor flow field is evenly distributed, guiding device of the present utility model is simple in structure, cheap and be easy to regulate, in the SCR flue gas denitrification system, use and to improve the even distribution of flue gas in system, denitration efficiency is significantly improved.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the arrangement schematic diagram of curved arc shape deflector.
Fig. 2 is the schematic diagram that the utility model is applied to flue gas denitrification system.
Fig. 3 is the structural representation of one group of curved arc shape deflector.
1-gas approach, 2-bend, 3-vertical gas pass, 4-eddy current hybrid element, 5-spray ammonia pipe, 6-curved arc shape deflector, 7-horizontal flue, 8-converging transition, 9-flow straightening grid, 10-first catalyst layer, 11-reactor, 12-air inlet, 13-gas outlet, 14-connector, 15-supporter.
The specific embodiment
Embodiment is referring to shown in Figure 1, the equally distributed device in this pneumatic flow field, comprise gas approach 1, bend 2, the vertical gas pass 3 that is communicated with reactor 11 tops and place diversion member in the bend 2, described diversion member is one group 3 to 20 a curved arc shape deflector 6 that is arranged in order along turning radius to the bend outside from curve inner side, and above-mentioned curved arc shape deflector 6 is the material of anti-420 ℃ of high temperature.The radian of above-mentioned bend 2 can be 90 degree-150 degree, and the spacing of each deflector and angle can be regulated.Leave the exhaust gases passes gap between the adjacent curved arc shape deflector, the end that flue gas enters exhaust gases passes is an air inlet 12, and the end that flue gas flows out exhaust gases passes is gas outlet 13, the air inlet spacing all greater than corresponding gas outlet spacing with it (D1〉D ' 1,, Dn〉and D ' is n).And the gas outlet spacing from curve inner side to the bend outside increase gradually (D ' 1＜D ' 2＜...＜D ' n), the two ends of each curved arc shape deflector 6 are connected with bend 2 both sides inwalls.
Referring to Fig. 2, a kind of equally distributed method in pneumatic flow field of using the equally distributed device in above-mentioned pneumatic flow field, with bend 2 sidewalls that reactor 11 tops are communicated with on diversion member is installed, this diversion member is one group of curved arc shape deflector 6 that is arranged in order along turning radius to the bend outside from curve inner side, leave the exhaust gases passes gap between the adjacent curved arc shape deflector, the end that flue gas enters exhaust gases passes is an air inlet 12, the end that flue gas flows out exhaust gases passes is gas outlet 13, the air inlet spacing is all greater than corresponding gas outlet spacing with it, and the gas outlet spacing increases from bottom to top gradually, the flue gas flow rate that makes curved arc shape deflector gas outlet is always greater than the air inlet flow velocity, and the flue gas flow rate of gas outlet reduces to the bend outside gradually from curve inner side, the flue gas at curve inner side air inlet place is with higher flow rate, reduced the exhaust gas volumn of reactor inlet section proximal end, the flue gas that enters the bend outside is then with lower flow rate, reduced the exhaust gas volumn of reactor inlet section far-end, the flue gas that flows out from curved arc shape deflector gas outlet enters reactor 11 through converging transition 8, after the rectification of flow straightening grid 9, be evenly distributed at first catalyst layer 10.
Referring to Fig. 2, flue gas enters denitrating system by boiler tail flue gas through interface, at first process horizontal flue 7 is after eddy current hybrid element 4 flow-disturbings enter vertical gas pass 3, a segment distance correspondence is provided with spray ammonia pipe 5 above hybrid element, flue gas is mixed with ammonia, in the bend of vertical gas pass 3 and gas approach 1 intersection, 6 the 90 ° curved arc shape deflectors 6 that turn to are set, during installation, according to different operating modes, according to curved arc shape deflector air inlet spacing all greater than the rule adjustment of gas outlet spacing, and the mode that curved arc shape deflector gas outlet spacing is increased from bottom to top gradually, be fixed on the bend sidewall.Flue gas enters gas approach 1 after turning to through curved arc shape deflector, enter reactor through converging transition 8, after the rectification of flow straightening grid 9, adjust flue gas flow direction and flow velocity once more, flue gas is evenly distributed, guaranteed that first catalyst layer, 10 inlet section each point flue gas stream velocity deviations are in ± 15% in the arrival reactor.Above-mentioned bend 2 is connected as a single entity with vertical gas pass 3.
Referring to Fig. 3, for easy for installation, the two ends of above-mentioned curved arc shape deflector 6 are connected with the connector 14 of both sides, and the connector by both sides can or be anchored with bend 2 both sides inwalls welding.When the flue size is big, for gaining in strength, can connect supporter 15 between the stage casing of above-mentioned adjacent curved arc shape deflector 6.
Claims (5)
- The equally distributed device in [claim 1] a kind of pneumatic flow field, comprise the gas approach (1) that is communicated with reactor (11) top, bend (2), vertical gas pass (3) and place diversion member in the bend (2), it is characterized in that: described diversion member is one group of curved arc shape deflector (6) that is arranged in order along turning radius to the bend outside from curve inner side, leave the exhaust gases passes gap between the adjacent curved arc shape deflector, the end that flue gas enters exhaust gases passes is air inlet (12), the end that flue gas flows out exhaust gases passes is gas outlet (13), the air inlet spacing is all greater than corresponding gas outlet spacing with it, and the gas outlet spacing increases to the bend outside gradually from curve inner side, the two ends of each curved arc shape deflector (6) are connected with bend (2) both sides inwall, and the radian of above-mentioned bend (2) is 90 degree-150 degree.
- The equally distributed device in [claim 2] pneumatic flow field according to claim 1 is characterized in that: above-mentioned curved arc shape deflector (6) is resistant to elevated temperatures metal or nonmetallic materials.
- The equally distributed device in [claim 3] pneumatic flow field according to claim 2, it is characterized in that: the sheet number of above-mentioned curved arc shape deflector (6) is 3-20.
- The equally distributed device in [claim 4] pneumatic flow field according to claim 3 is characterized in that: the two ends of above-mentioned each curved arc shape deflector (6) are connected with the connector (14) of both sides, and connector and bend (2) the both sides inwall by both sides is connected.
- The equally distributed device in [claim 5] pneumatic flow field according to claim 4, it is characterized in that: the stage casing of above-mentioned each curved arc shape deflector (6) vertically connects supporter (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203018948U CN201244443Y (en) | 2008-08-21 | 2008-08-21 | Device for even distribution of pneumatic flow field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203018948U CN201244443Y (en) | 2008-08-21 | 2008-08-21 | Device for even distribution of pneumatic flow field |
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| Publication Number | Publication Date |
|---|---|
| CN201244443Y true CN201244443Y (en) | 2009-05-27 |
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ID=40728258
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008203018948U Expired - Lifetime CN201244443Y (en) | 2008-08-21 | 2008-08-21 | Device for even distribution of pneumatic flow field |
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| CN (1) | CN201244443Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102895858A (en) * | 2012-11-05 | 2013-01-30 | 东南大学 | Flue gas denitration device |
| CN103007749A (en) * | 2012-12-12 | 2013-04-03 | 盐城工学院 | Guiding device and guiding method for uniformly distributed flow field of pi type SCR (Selective Catalytic Reduction) denitrification reactor |
| CN103961993A (en) * | 2014-05-15 | 2014-08-06 | 中冶赛迪工程技术股份有限公司 | Gas flow equalizing device of spraying tower |
| CN107449527A (en) * | 2017-07-19 | 2017-12-08 | 北京航空航天大学 | A kind of method for improving stagnation formula stagnation temperature probe measurement precision |
| WO2018065323A1 (en) * | 2016-10-05 | 2018-04-12 | General Electric Technology Gmbh | Multi-function duct for dry scrubber system |
| CN113346679A (en) * | 2020-02-18 | 2021-09-03 | 日本电产株式会社 | Motor and driving device |
-
2008
- 2008-08-21 CN CNU2008203018948U patent/CN201244443Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102895858A (en) * | 2012-11-05 | 2013-01-30 | 东南大学 | Flue gas denitration device |
| CN102895858B (en) * | 2012-11-05 | 2014-06-11 | 东南大学 | Flue gas denitration device |
| CN103007749A (en) * | 2012-12-12 | 2013-04-03 | 盐城工学院 | Guiding device and guiding method for uniformly distributed flow field of pi type SCR (Selective Catalytic Reduction) denitrification reactor |
| CN103961993A (en) * | 2014-05-15 | 2014-08-06 | 中冶赛迪工程技术股份有限公司 | Gas flow equalizing device of spraying tower |
| WO2018065323A1 (en) * | 2016-10-05 | 2018-04-12 | General Electric Technology Gmbh | Multi-function duct for dry scrubber system |
| US10232310B2 (en) | 2016-10-05 | 2019-03-19 | General Electric Technology Gmbh | Multi-function duct for dry scrubber system |
| CN107449527A (en) * | 2017-07-19 | 2017-12-08 | 北京航空航天大学 | A kind of method for improving stagnation formula stagnation temperature probe measurement precision |
| CN107449527B (en) * | 2017-07-19 | 2020-01-31 | 北京航空航天大学 | method for improving measurement accuracy of stagnation type total temperature probe |
| CN113346679A (en) * | 2020-02-18 | 2021-09-03 | 日本电产株式会社 | Motor and driving device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Jiangsu Longyuan Catalyst Co., Ltd. Assignor: Guodian Longyuan Environment Protection Engrg. Co., Ltd., Beijing Contract record no.: 2010320000731 Denomination of utility model: Flue gas denitrating apparatus with special rectifier cell Granted publication date: 20090527 License type: Exclusive License Record date: 20100607 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090527 |
|
| CX01 | Expiry of patent term |