CN202844884U - Ammonia spraying and eddy-mixing device of flue gas denitrification system - Google Patents
Ammonia spraying and eddy-mixing device of flue gas denitrification system Download PDFInfo
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- CN202844884U CN202844884U CN 201220255640 CN201220255640U CN202844884U CN 202844884 U CN202844884 U CN 202844884U CN 201220255640 CN201220255640 CN 201220255640 CN 201220255640 U CN201220255640 U CN 201220255640U CN 202844884 U CN202844884 U CN 202844884U
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Abstract
The utility model discloses an ammonia spraying and eddy-mixing device of a flue gas denitrification system. The device comprises eddy-mixing components fixed in a vertical flue, ammonia spraying tubes inserted in the inner part of the vertical flue and guide vanes fixed in curves, wherein more than two round streaming plates which are equal in size and are in spacing distribution in the vertical flue are used as the eddy-mixing components; and one ammonia spraying tube is correspondingly arranged above each round streaming plate. Flow equalizing tubes are arranged horizontally in spacing distribution above the ammonia spraying tubes. A group of guide vanes is fixed in each of a curve I and a curve II. The device can be widely applicable to the selective catalytic reduction (SCR) flue gas denitrification system of a coal-fired power plant, effectively solves the problem of nonuniform mixing of flow field and reactant caused by inclining a flue inlet of the SCR denitrification system and the like, and is convenient for the engineering design and construction and installation of the SCR flue gas denitrification system.
Description
Technical field
The utility model relates to the Forming Nitric Ooxide in Coal Fired Boiler of Electric Power Station control technology, particularly the gas of a kind of flue gas SCR denitration system spray ammonia and mixing arrangement.
Background technology
SCR technology (SCR) is a kind of gas denitrifying technology that is most widely used at present, the SCR denitrating system has the characteristics such as equipment size is large, flue layout limitation is large, load distribution to flue gas flow rate, ammonia nitrogen ratio, temperature and flying dust has proposed quite high requirement, the further investigation flue gas denitrification system, improve the mixing uniformity of flue gas and ammonia, will be for domestic independent research flue gas denitrification system provide guidance, simultaneously, great for the energy-saving and emission-reduction work meaning of coal-burning power plant.
SCR catalyst reactor entrance section reactant (mainly is NH
3And NOx) uniformity of CONCENTRATION DISTRIBUTION is most important for the operation of denitrification apparatus.Reactant distribution is uneven, so that reaction can not fully be carried out, reduces denitration performance.Ammonia is excessive in some zone, can cause superfluous the escaping of ammonia to go out reactor, causes new environmental pollution, causes simultaneously the denitration effect variation; The ammonia quantity not sufficient that some is regional, the result who then causes NOx not to be reduced.
The SCR process system that China adopts high-temperature high dust to arrange usually, the SCR reactor is usually placed in the upstream of economizer downstream, dust arrester.Limit owing to being subjected to the reasons such as the space, place is little, reactor size is large, usually adopt rectangle inclination flue at SCR reactor and economizer exit junction in the design, tilt angle alpha is 32 °, causes vertical gas pass inlet flue gas VELOCITY DISTRIBUTION inhomogeneous, V5 side speed is large, and V1 side speed is low.The existing mixing arrangement that is installed in the flue all can't be adjusted the flow velocity that enters flue gas in the vertical gas pass, and the spray speed of ammonia can't adapt with velocity of flue gas, has affected the mixed effect of flue gas and reducing agent ammonia, and the utilization rate of ammonia is low.Flue gas with still have partial fume to fail to mix after ammonia mixes, and existing mixing arrangement can't make this part flue gas mix with ammonia again, the denitration efficiency of flue gas is low.
Summary of the invention
The utility model provides a kind of spray ammonia and eddy current mixing arrangement of flue gas denitrification system, solve the SCR denitrating system flue entrance reducing agent cause that tilts and mix inhomogeneous problem with reactant.
The technical scheme that its technical problem that solves the utility model adopts is:
The spray ammonia of this flue gas denitrification system and eddy current mixing arrangement, comprise the eddy current hybrid element that is fixed in the vertical gas pass, the spray ammonia pipe that inserts vertical gas pass inside, and be fixed in guide vane in the bend, described vertical gas pass upper end is connected with the converging transition flue through bend II, the vertical gas pass lower end is connected with entrance rectangle inclination flue through bend I, entrance rectangle inclination flue is with respect to the vertical gas pass lateral tilt, and the inclination angle is α;
Described eddy current hybrid element is that two above equal and opposite in directions, circle spaced apart in vertical gas pass are streamed plate, each circle is streamed plate and is all tilted to be fixed in the vertical gas pass bottom to reactor-side, the stoss side that circle is streamed plate and the Gas phase Smoke that enters vertical gas pass pair, the lee side that circle is streamed plate tilts relative with the shower nozzle that sprays the ammonia pipe;
Each circle stream plate top respectively correspondence a spray ammonia pipe is installed, spray ammonia pipe level inserts that the circular vertical gas pass that streams the plate top is inner, shower nozzle arranges straight down, each sprays and is connected with independently flow control system on the ammonia pipe;
In the vertical gas pass of described spray ammonia pipe top the current-sharing pipe that the lateral separation distributes is installed, current-sharing pipe two ends and vertical gas pass inwall are fixed;
Described guide vane is one group of curved arc shape deflector of equidistantly arranging along the bend radius of the radian, 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, the end that smoke gas flow goes out exhaust gases passes is the gas outlet, and guide vane is fixed with respectively one group in bend I and bend II.
The angle β that described circle is streamed plate and horizontal direction is 30 °～45 °.
The diameter d that described circle is streamed plate greater than the vertical gas pass width 50% and be no more than 80% of vertical gas pass width.
Described circle is streamed the height of plate in vertical gas pass and is lower than 25% of vertical gas pass height.
Described current-sharing pipe by reactor-side and vertical gas pass inwall apart from a greater than the current-sharing pipe that leans on entrance rectangle inclination flue side and the distance c of vertical gas pass inwall.
Described current-sharing pipe and the circular vertical range e that streams between the plate center of circle are circular 2～3 times of streaming board diameter d.
The diameter of described current-sharing pipe can be 80mm～120mm.
The height of described vertical gas pass is greater than the twice of its entrance equivalent diameter.
Operation principle of the present utility model is as follows:
Eddy current hybrid element of the present utility model has utilized the theory in the whirlpool in the aerodynamics, under the effect of flue gas, forms vortex, i.e. " district in the whirlpool " at the eddy current hybrid element back side.The characteristics of staying the whirlpool are that its position is invariable, and no matter how the size of flue gas flow rate changes, and the position in district in the whirlpool is substantially constant.Because the structural deflection of gas approach causes vortex mixer entrance section VELOCITY DISTRIBUTION inhomogeneous, V5 side speed is large, and V1 side speed is low.Flue gas streams panel area in circle and forms and to entrainment power, entrainments power size and the proportional relation of speed, and the circle that V5 is corresponding is streamed the panel area flue gas, and to entrainment ability the strongest, the rapid blending of ammonia and flue gas.
When the mist of flue gas and ammonia is flowed through the current-sharing pipe, around pipe, form and stream, the pipe downstream fluid can be streamed the phenomenon of Vortex Shedding behind the object, namely there be " Karman vortex street ", the periodicity vortex that alternately produces has increased the turbulence intensity of flue internal flow, strengthened flue gas and further evenly mixed with reducing agent ammonia, the current-sharing pipe has also played certain rectified action, has realized mixing of flue gas and reducing agent ammonia in vertical gas pass.Simultaneously, vertical gas pass is longer, and flow field, catalyst inlet cross section and concentration field are more even, and the vertical gas pass height should be greater than 2 times of its entrance equivalent diameters.
The beneficial effects of the utility model are as follows:
The utility model is on early stage SCR denitration engineering and theoretical research basis, and spray ammonia and the eddy current mixing arrangement of a kind of flue gas SCR denitration system of proposition have been optimized NH
3/ NO
xMixed effect has improved utilization rate and the denitration efficiency of catalyst.
The utility model utilizes the eddy current realization flue gas of flue gas formation around the eddy current hybrid element and fully mixing of reducing agent ammonia, utilizes the realization flue gas that streams that forms around the current-sharing pipe evenly to mix with the further of reducing agent, makes NH
3/ NO
xIn the even deviation of ground floor catalyst inlet section concentration in ± 5%.Wherein the eddy current hybrid element adopts a plurality of circles to stream plate, and it is in tilted layout in vertical gas pass.The eddy current hybrid element has double action: realize on the one hand mixing of flue gas and reducing agent, can increase on the other hand the uniformity coefficient in flow field.Each streams the corresponding spray ammonia pipe in plate top, and spray ammonia Guan Jun has independently flow control system.Ammonia jet velocity V1～V5 by reasonable distribution spray ammonia pipe adapts the flow velocity of ammonia jet velocity and flue gas, and it is more even that reducing agent ammonia is mixed with flue gas.Laterally add the current-sharing pipe in vertical gas pass, the current-sharing pipe can play the effect of mixing of further reinforcement flue gas and ammonia and rectification, and makes flue gas flow rate more even.The utility model installs respectively one group of arc guide vane additional in elbow I and elbow II, having improved flow direction, to change the flow field that causes inhomogeneous, improved the uniformity of vertical gas pass entrance section speed.
The utility model is simple in structure, the adjusting time short, be convenient to install, do not need maintenance, flue gas strong adaptability, NH
3/ NO
xGood mixing effect has improved utilization rate and the denitration efficiency of catalyst.The utility model can be widely used in the SCR SCR of the coal-burning power plant flue gas denitrification system, effectively solve flow field and the reactant that SCR denitrating system flue entrance tilts to cause and mixed the problems such as inhomogeneous, made things convenient for the engineering design and construction of SCR flue gas denitrification system to install.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of Figure 1A-A section.
Fig. 3 is the structural representation of Figure 1B-B section.
Reference numeral: 1-entrance rectangle inclination flue, 2-bend I, 3-circle are streamed plate, 4-spray ammonia pipe, 5-current-sharing pipe, 6-vertical gas pass, 7-guide vane, 8-converging transition flue, 9-grating type rectifier, 10-ground floor catalyst, 11-reactor, 12-bend II.
The specific embodiment
Embodiment is referring to shown in Figure 1, the spray ammonia of this flue gas denitrification system and eddy current mixing arrangement, comprise the eddy current hybrid element that is fixed in the vertical gas pass 6, the spray ammonia pipe 4 that inserts vertical gas pass 6 inside, and be fixed in guide vane 7 in the bend, described vertical gas pass 6 upper ends are connected with converging transition flue 8 through bend II, the vertical gas pass lower end is connected with entrance rectangle inclination flue 1 through bend I, and entrance rectangle inclination flue 1 is with respect to vertical gas pass 6 lateral tilts, and the inclination angle is α.
Referring to Fig. 1, shown in Figure 2, described eddy current hybrid element is two above equal and opposite in directions, streams plate 3 in vertical gas pass 6 interior circles spaced apart, each circle is streamed plate 3 and all tiltedly is fixed in vertical gas pass 6 bottoms to reactor 11 inclinations, it is 30 ° with horizontal direction angle β that circle is streamed plate 3, the stoss side that circle is streamed plate 3 and the Gas phase Smoke that enters vertical gas pass 6 pair, the lee side that circle is streamed plate 3 tilts relative with the shower nozzle that sprays ammonia pipe 4.
The angle β that described circle is streamed plate 3 and horizontal direction is 30 °～45 °.The diameter d that circle is streamed plate 3 greater than vertical gas pass 6 width 50% and be no more than 80% of vertical gas pass 6 width.Circle is streamed the height of plate 3 in vertical gas pass 6 and is lower than 25% of vertical gas pass 6 height.
Described each circle stream plate 3 tops respectively correspondence a spray ammonia pipe 4 is installed, vertical range is 500mm.Spray ammonia pipe 4 levels are inserted circular vertical gas pass 6 inside of streaming plate 3 tops, and shower nozzle arranges straight down, and each sprays and is connected with independently flow control system on the ammonia pipe 4.Five spray ammonia pipes 4 according to entrance rectangle inclination flue 1 interior inclined angle alpha distance from the near to the remote, its ammonia jet velocity is respectively V1～V5, wherein V1, V2 are 7～8 m/s, V3, V4, V5 are 10 m/s.
Referring to Fig. 1, shown in Figure 3, the current-sharing pipe 5 that five lateral separations distribute is installed in the vertical gas pass 6 of described spray ammonia pipe 4 tops, current-sharing pipe 5 two ends and vertical gas pass 6 inwalls are fixed; Current-sharing pipe 5 and the circular vertical range e that streams between plate 3 centers of circle are circular 2～3 times of streaming plate 3 diameter d.Current-sharing pipe 5 is circular 2～3 times of streaming board diameter d with the circular vertical range e that streams plate 3 centers of circle.The diameter of current-sharing pipe 5 can be 100mm.
Described guide vane 7 is one group of curved arc shape deflector of equidistantly arranging along the bend radius of the radian, and curved arc shape deflector can six one group, and each guide vane radian is pi/2.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, and the end that smoke gas flow goes out exhaust gases passes is the gas outlet, and guide vane 7 is fixed with respectively one group in bend I and bend II.
The course of work of the present utility model:
The spray ammonia of this flue gas denitrification system and eddy current mixed method, step is as follows:
A, flue gas enter bend I from entrance rectangle inclination flue 1, enter in the vertical gas pass 6 after guide vane 7 is adjusted flue gas flow direction and flow velocity;
B, enter circle that the flue gas of vertical gas pass 6 tilted and stream plate 3 stoss sides and stop that the edge that streams plate 3 in circle forms eddy current; Regulate the flow respectively spray ammonia pipe 4, the jet velocity flue gas flow rate corresponding with its below that respectively sprays ammonia pipe 4 ammonia adapted, with the ammonia jet velocity of the nearest spray ammonia pipe 4 of inclined angle alpha less than with the ammonia jet velocity of inclined angle alpha apart from farthest spray ammonia pipe 4.Ammonia is ejected into the lee side that circle is streamed plate 3, and diffuses to circle and stream plate 3 edges and flue gas and form eddy current and mix;
The mixed gas flow of C, flue gas and ammonia upwards forms around current-sharing pipe 5 and streams, and flue gas and ammonia further mix, and flow velocity is more balanced simultaneously;
The mixed gas flow of D, flue gas and ammonia enters converging transition flue 8 after upwards adjusting flue gas flow direction and flow velocity by the guide vane 7 in the bend II, after 9 rectifications of grating type rectifier, finally enters in the reactor 11 again.
The design condition of SCR denitrating system is:
Exhaust gas volumn 1539 m
3/ s;
370 ℃ of flue-gas temperatures;
NOx entrance concentration 450mg/Nm
3(butt, oxygen content 6%).
Claims (8)
1. the spray ammonia of a flue gas denitrification system and eddy current mixing arrangement, comprise the eddy current hybrid element that is fixed in the vertical gas pass (6), the spray ammonia pipe (4) that inserts vertical gas pass (6) inside, and be fixed in guide vane (7) in the bend, described vertical gas pass (6) upper end is through bend II(12) be connected with converging transition flue (8), the vertical gas pass lower end is through bend I(2) be connected with entrance rectangle inclination flue (1), entrance rectangle inclination flue (1) is with respect to vertical gas pass (6) lateral tilt, the inclination angle is a, it is characterized in that:
Described eddy current hybrid element is two above equal and opposite in directions, circle spaced apart is streamed plate (3) in vertical gas pass (6), each circle is streamed plate (3) and all tiltedly is fixed in vertical gas pass (6) bottom to reactor (11) inclination, the stoss side that circle is streamed plate (3) and the Gas phase Smoke that enters vertical gas pass (6) pair, the lee side that circle is streamed plate (3) tilts relative with the shower nozzle that sprays ammonia pipe (4);
Each circle stream plate (3) top respectively correspondence a spray ammonia pipe (4) is installed, spray ammonia pipe level is inserted vertical gas pass (6) inside that circle is streamed plate (3) top, shower nozzle arranges straight down, and each sprays on the ammonia pipe (4) and is connected with independently flow control system;
In the vertical gas pass (6) of described spray ammonia pipe (4) top the current-sharing pipe (5) that the lateral separation distributes is installed, current-sharing pipe (5) two ends and vertical gas pass (6) inwall are fixed;
Described guide vane (7) is one group of curved arc shape deflector of equidistantly arranging along the bend radius of the radian, 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, the end that smoke gas flow goes out exhaust gases passes is the gas outlet, and guide vane (7) is at bend I(2) and bend II(12) in be fixed with respectively one group.
2. the spray ammonia of flue gas denitrification system according to claim 1 and eddy current mixing arrangement is characterized in that: the angle β that described circle is streamed plate (3) and horizontal direction is 30 °～45 °.
3. the spray ammonia of flue gas denitrification system according to claim 1 and eddy current mixing arrangement is characterized in that: the diameter d that described circle is streamed plate (3) greater than vertical gas pass (6) width 50% and be no more than 80% of vertical gas pass (6) width.
4. the spray ammonia of flue gas denitrification system according to claim 1 and eddy current mixing arrangement is characterized in that: described circle is streamed the height of plate (3) in vertical gas pass (6) and is lower than 25% of vertical gas pass (6) height.
5. the spray ammonia of flue gas denitrification system according to claim 1 and eddy current mixing arrangement is characterized in that: described current-sharing pipe by reactor (11) side and vertical gas pass inwall apart from a greater than the current-sharing pipe that leans on entrance rectangle inclination flue (1) side and the distance c of vertical gas pass inwall.
6. the spray ammonia of flue gas denitrification system according to claim 1 and eddy current mixing arrangement, it is characterized in that: the vertical range e that described current-sharing pipe (5) and circle are streamed between plate (3) center of circle is 2～3 times that circle is streamed plate (3) diameter d.
7. the spray ammonia of flue gas denitrification system according to claim 1 and eddy current mixing arrangement, it is characterized in that: the diameter of described current-sharing pipe (5) is 80mm～120mm.
8. the spray ammonia of flue gas denitrification system according to claim 1 and eddy current mixing arrangement, it is characterized in that: the height of described vertical gas pass (6) is greater than the twice of its entrance equivalent diameter.
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| CN 201220255640 CN202844884U (en) | 2012-06-01 | 2012-06-01 | Ammonia spraying and eddy-mixing device of flue gas denitrification system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103506005A (en) * | 2013-10-11 | 2014-01-15 | 东南大学 | SCR denitration device and denitration method applicable to middle and small-size boilers |
| CN106731789A (en) * | 2016-12-05 | 2017-05-31 | 北京工业大学 | A kind of efficient SCR denitration reactor |
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
| CN109289517A (en) * | 2018-09-13 | 2019-02-01 | 大唐东北电力试验研究院有限公司 | Selective catalytic reduction denitration device catalyst anti-wearing method |
| CN110295981A (en) * | 2019-08-13 | 2019-10-01 | 中国船舶重工集团柴油机有限公司 | A kind of high pressure SCR system of efficient emission-reducing peculiar to vessel |
| CN110508117A (en) * | 2019-08-16 | 2019-11-29 | 华电电力科学研究院有限公司 | A kind of guiding device and its working method applied to flue gas flow direction changeable in flue |
| CN110585867A (en) * | 2019-08-30 | 2019-12-20 | 中国寰球工程有限公司 | Fluid uniform distributor and uniform distribution device thereof |
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2012
- 2012-06-01 CN CN 201220255640 patent/CN202844884U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103506005A (en) * | 2013-10-11 | 2014-01-15 | 东南大学 | SCR denitration device and denitration method applicable to middle and small-size boilers |
| CN103506005B (en) * | 2013-10-11 | 2015-04-15 | 东南大学 | SCR denitration device and denitration method applicable to middle and small-size boilers |
| CN106731789A (en) * | 2016-12-05 | 2017-05-31 | 北京工业大学 | A kind of efficient SCR denitration reactor |
| CN107008147A (en) * | 2017-06-09 | 2017-08-04 | 南京电力设备质量性能检验中心 | A kind of ammonia-gas spraying device for SCR denitration system |
| CN107008147B (en) * | 2017-06-09 | 2023-01-31 | 国能南京电力试验研究有限公司 | Ammonia spraying device for SCR denitration system |
| CN109289517A (en) * | 2018-09-13 | 2019-02-01 | 大唐东北电力试验研究院有限公司 | Selective catalytic reduction denitration device catalyst anti-wearing method |
| CN110295981A (en) * | 2019-08-13 | 2019-10-01 | 中国船舶重工集团柴油机有限公司 | A kind of high pressure SCR system of efficient emission-reducing peculiar to vessel |
| CN110508117A (en) * | 2019-08-16 | 2019-11-29 | 华电电力科学研究院有限公司 | A kind of guiding device and its working method applied to flue gas flow direction changeable in flue |
| CN110508117B (en) * | 2019-08-16 | 2023-12-29 | 华电电力科学研究院有限公司 | Flow guiding device capable of changing flue gas flow direction applied in flue and working method thereof |
| CN110585867A (en) * | 2019-08-30 | 2019-12-20 | 中国寰球工程有限公司 | Fluid uniform distributor and uniform distribution device thereof |
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