CN101342462A - Device and method for even distribution of pneumatic flow field - Google Patents
Device and method for even distribution of pneumatic flow field Download PDFInfo
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- CN101342462A CN101342462A CNA2008103041224A CN200810304122A CN101342462A CN 101342462 A CN101342462 A CN 101342462A CN A2008103041224 A CNA2008103041224 A CN A2008103041224A CN 200810304122 A CN200810304122 A CN 200810304122A CN 101342462 A CN101342462 A CN 101342462A
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Abstract
The invention relates to a device with a pneumatic flow field in uniform distribution and a method; the device comprises an inlet gas flue communicated with the top of an reactor, a curved conduit, a vertical gas flue and a diversion component arranged in the curved conduit; the diversion component is a group of curved arc guide plates which are arranged successively along with the radius of the curved conduit from the inner side to the outer side of the curved conduit; a gas for a smoke gas passage is arranged between the adjacent curved arc guide plates; the end of the smoke gas passage, into which the smoke gas enters, is an air inlet; the end of the smoke gas passage, from which the smoke gas overflows, is an air outlet; space between the air inlets is larger than the space between the corresponding air outlets; and the space between the air outlets is increased gradually from the inner side to the outer side of the curved conduit; the both ends of the curved arc guide plates are connected with the inwall on the both ends of the curved conduit. The diversion device of the invention has the advantages of simple structure, cheap fabrication cost and easy adjustment, and is capable of improving the uniform distribution of the smoke gas in a SCR smoke gas denitration system so as to notably increase denitration efficiency.
Description
Technical field
The present invention relates to a kind of guiding device and method thereof of fluid, particularly a kind of method 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.
Summary of the invention
For addressing the above problem, the invention provides the equally distributed devices and methods therefor in a kind of pneumatic flow field, 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 solution adopted for the present invention to solve the technical problems 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, and the two ends of each curved arc shape deflector are connected with bend both sides inwall.
Above-mentioned curved arc shape deflector is resistant to elevated temperatures metal or nonmetallic materials.
The radian of above-mentioned bend and curved arc shape deflector is 90 degree-150 degree.
The sheet number of above-mentioned curved arc shape deflector is the 3-20 sheet.
The two ends of above-mentioned 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.
Can connect supporter between the stage casing of above-mentioned adjacent curved arc shape deflector.
The equally distributed method in a kind of pneumatic flow field, it is characterized in that: on the bend sidewall that is communicated with reactor head, diversion member is installed, this 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 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 of curve inner side 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 through converging transition, after the rectification of flow straightening grid, be evenly distributed at first catalyst layer.
The present invention 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 present invention can regulate 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 invention 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
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the arrangement schematic diagram of curved arc shape deflector.
Fig. 2 is the schematic diagram that the present invention 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 and curved arc shape deflector 6 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, and the air inlet spacing is all greater than spacing (D1＞D ' 1, corresponding gas outlet with it,, Dn＞D ' 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, the equally distributed method in a kind of 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.
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 diversion member, enter reactor through converging transition 8, after flow straightening grid 9 rectifications, 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 vertically connect supporter 15 between the stage casing of above-mentioned adjacent curved arc shape deflector 6.
Claims (7)
1. equally distributed device in 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, and the two ends of each curved arc shape deflector (6) are connected with bend (2) both sides inwall.
2. the equally distributed device in 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.
3. the equally distributed device in pneumatic flow field according to claim 2 is characterized in that: the radian of above-mentioned bend (2) and curved arc shape deflector (6) is 90 degree, 150 degree.
4. the equally distributed device in pneumatic flow field according to claim 3 is characterized in that: the sheet number of above-mentioned curved arc shape deflector (6) is the 3-20 sheet.
5. the equally distributed device in pneumatic flow field according to claim 4 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.
6. the equally distributed device in pneumatic flow field according to claim 5 is characterized in that: the stage casing of above-mentioned each curved arc shape deflector (6) connects supporter (15).
7. an application rights requires the equally distributed method in pneumatic flow field of the equally distributed device in the pneumatic flow field of 1-6, it is characterized in that: with bend (2) sidewall that reactor (11) top is 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 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).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008103041224A CN101342462B (en) | 2008-08-21 | 2008-08-21 | Device and method for even distribution of pneumatic flow field |
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|---|---|---|---|
| CN2008103041224A CN101342462B (en) | 2008-08-21 | 2008-08-21 | Device and method for even distribution of pneumatic flow field |
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| CN101342462A true CN101342462A (en) | 2009-01-14 |
| CN101342462B CN101342462B (en) | 2011-05-18 |
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| CN101721889B (en) * | 2009-12-31 | 2012-01-25 | 无锡雪浪环境科技股份有限公司 | Airflow distribution device for smoke cooling tower |
| CN102470319A (en) * | 2009-08-05 | 2012-05-23 | 三菱重工业株式会社 | Device for treating exhaust gas |
| CN102698579A (en) * | 2012-06-01 | 2012-10-03 | 北京国电龙源环保工程有限公司 | Ammonia injection and eddy current mixing device and method of flue gas denitrification system |
| 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 |
| CN104595918A (en) * | 2015-01-23 | 2015-05-06 | 中国电力工程顾问集团东北电力设计院有限公司 | Flue elbow with streamline type flow guide module |
| CN107824044A (en) * | 2017-12-01 | 2018-03-23 | 山西大学 | A kind of flow fieldoptimization device of apparatus of thermo-electric power boiler denitrating system |
| CN108543401A (en) * | 2018-05-10 | 2018-09-18 | 国电科学技术研究院有限公司 | The double scale dynamic homogenization systems in flow field |
| CN108800175A (en) * | 2017-04-26 | 2018-11-13 | 南京空天机电设备有限公司 | A kind of large size flue Three-dimensional Flow homogenization method and device |
| CN109114618A (en) * | 2018-10-23 | 2019-01-01 | 北斗星智能电器有限公司 | A kind of air channel structure and integrated kitchen range |
| CN109173708A (en) * | 2018-09-14 | 2019-01-11 | 国网河北省电力有限公司电力科学研究院 | Flow mixing device, SCR denitration system and denitrating system flue gas duct even method |
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| CN112569774A (en) * | 2020-12-25 | 2021-03-30 | 郑州市天之蓝环保科技有限公司 | Dust-containing flue gas conveying reversing pipeline and dry desulfurization system |
| CN114251671A (en) * | 2021-12-15 | 2022-03-29 | 国家能源集团宝庆发电有限公司 | Adjustable flow guide device |
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| CN100425325C (en) * | 2006-06-26 | 2008-10-15 | 马春强 | Dusted composite SCR smoke denitration and its denitrating catalytic reactor |
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2008
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| CN102470319A (en) * | 2009-08-05 | 2012-05-23 | 三菱重工业株式会社 | Device for treating exhaust gas |
| US9132391B2 (en) | 2009-08-05 | 2015-09-15 | Mitsubishi Hitachi Power Systems, Ltd. | Air pollution control device |
| CN101721889B (en) * | 2009-12-31 | 2012-01-25 | 无锡雪浪环境科技股份有限公司 | Airflow distribution device for smoke cooling tower |
| CN102698579A (en) * | 2012-06-01 | 2012-10-03 | 北京国电龙源环保工程有限公司 | Ammonia injection and eddy current mixing device and method of flue gas denitrification system |
| 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 |
| CN104595918A (en) * | 2015-01-23 | 2015-05-06 | 中国电力工程顾问集团东北电力设计院有限公司 | Flue elbow with streamline type flow guide module |
| CN108800175A (en) * | 2017-04-26 | 2018-11-13 | 南京空天机电设备有限公司 | A kind of large size flue Three-dimensional Flow homogenization method and device |
| CN107824044B (en) * | 2017-12-01 | 2023-09-22 | 山西大学 | Flow field optimizing device of thermal power boiler denitration system |
| CN107824044A (en) * | 2017-12-01 | 2018-03-23 | 山西大学 | A kind of flow fieldoptimization device of apparatus of thermo-electric power boiler denitrating system |
| CN108543401A (en) * | 2018-05-10 | 2018-09-18 | 国电科学技术研究院有限公司 | The double scale dynamic homogenization systems in flow field |
| CN108543401B (en) * | 2018-05-10 | 2023-06-13 | 国家能源集团科学技术研究院有限公司 | Flow field double-scale dynamic homogenization system |
| CN109173708A (en) * | 2018-09-14 | 2019-01-11 | 国网河北省电力有限公司电力科学研究院 | Flow mixing device, SCR denitration system and denitrating system flue gas duct even method |
| CN109114618A (en) * | 2018-10-23 | 2019-01-01 | 北斗星智能电器有限公司 | A kind of air channel structure and integrated kitchen range |
| CN109114618B (en) * | 2018-10-23 | 2024-05-28 | 北斗星智能电器有限公司 | Air duct structure and integrated kitchen |
| CN111188096A (en) * | 2020-03-12 | 2020-05-22 | 浙江朝隆纺织机械股份有限公司 | Air box equipment capable of uniformly distributing air and application thereof |
| CN111455926A (en) * | 2020-05-26 | 2020-07-28 | 扬州大学 | Device and method for improving flow state of curve slope of pump station by compounding 30-degree fan |
| CN112569774A (en) * | 2020-12-25 | 2021-03-30 | 郑州市天之蓝环保科技有限公司 | Dust-containing flue gas conveying reversing pipeline and dry desulfurization system |
| CN114251671A (en) * | 2021-12-15 | 2022-03-29 | 国家能源集团宝庆发电有限公司 | Adjustable flow guide device |
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Address after: 100039 room 901, 9 / F, building 1, yard 16, West Fourth Ring Middle Road, Haidian District, Beijing Patentee after: Guoneng Longyuan environmental protection Co.,Ltd. Address before: 100052 Beijing City, Xuanwu District Xuanwu street outside No. 28 Futuris building block A No. 1609 Patentee before: BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. |