CN103768938B - The equal mixing device of a kind of ammonia-flue gas - Google Patents
The equal mixing device of a kind of ammonia-flue gas Download PDFInfo
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- CN103768938B CN103768938B CN201310649014.1A CN201310649014A CN103768938B CN 103768938 B CN103768938 B CN 103768938B CN 201310649014 A CN201310649014 A CN 201310649014A CN 103768938 B CN103768938 B CN 103768938B
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- 239000003546 flue gas Substances 0.000 title claims abstract description 68
- 230000003068 static effect Effects 0.000 claims abstract description 65
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000005507 spraying Methods 0.000 claims description 19
- 238000009826 distribution Methods 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 72
- 229910021529 ammonia Inorganic materials 0.000 abstract description 36
- 238000000034 method Methods 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 108700018263 Brassica oleracea SCR Proteins 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to flue gases purification field, be specifically related to the equal mixing device of a kind of ammonia-flue gas.The equal mixing device of a kind of ammonia-flue gas, comprise at least one group of static mixer be arranged in flue, often organize static mixer to be made up of 4 mixer units, each mixer unit is made up of the mixed plate blade that two intersect, and mixed plate blade becomes 30 ° ~ 60 ° angles with flue gas flow direction.Flue gas is through often organizing static mixer, except the local eddy currents that each mixed plate blade is formed, the adjacent 4 pieces of mixed plate blades in center are then formed counterclockwise (or clockwise) eddy flow whirlpool, 4 pieces of peripheral mixed plate blades then produce rightabout eddy flow whirlpool, thus on flue gas flow direction, form the contrary double vortex flow in direction; The mixing of inverse double-rotation eddy current is strong, enhances mixed process, ammonia is uniformly distributed, shorten simultaneously and reach ammonia homogenising target required separation distance, improve denitration efficiency; The pressure drop caused is less, and energy utilization efficiency is high.
Description
Technical field
The present invention relates to flue gases purification field, be specifically related to the equal mixing device of a kind of ammonia-flue gas.
Background technology
Along with becoming increasingly conspicuous of environmental problem, nitrogen oxide has become one of China's air pollution emission major control target.SCR technology (SCR), because of technical maturity, reliable, denitration efficiency advantages of higher, becomes the first-selection of gas denitrifying technology.SCR technology is sent in flue by defeated ammonia pipe by reducing agent ammonia, mixes with the flue gas in flue, then under the effect of catalyst, reducing agent ammine selective with the NO in flue gas
xreact, by NO
xbe reduced into N
2, generate H simultaneously
2o.Existing SCR flue gas denitrification system, flue is arranged closely, cause occurring that flue gas stream skewness, flue gas mix unequal phenomenon with ammonia, had a strong impact on denitration efficiency, the distribution of beds pre reduction agent ammonia is the key factor affecting denitration efficiency, the escaping of ammonia.What outstanding equal mixing device effectively can shorten ammonia and flue gas mixes distance, reduces the nozzle quantity of ammonia-spraying grid, ammonia is better mixed with air.Being uniformly distributed of ammonia both can improve denitration efficiency, again can extending catalyst replacement period, reduced amount of ammonia slip, alleviated the Corrosion blockage of air preheater, reduced investment and operational management cost.Therefore the equal mixing device design of ammonia and flue gas affects the equally distributed key factor of ammonia, becomes the key of SCR flue gas denitrification system technological design.
Authorization Notice No. is the petal-shaped ammonia-spraying grid that the Chinese patent of CN103007701A discloses a kind of local eddy currents and integral cyclone and combines, comprise female arm of managing and being managed by mother the 4-8 root of upper extraction, every root arm is furnished with a nozzle, arranged beneath disk of each nozzle, the flow direction of disk and flue gas is 45 ° ~ 60 ° and arranges, and each disk is all not identical with the angle of flue gas flow direction, each disk is spatially formed clockwise or is rotated counterclockwise.Concerning often organizing petal-shaped ammonia-spraying grid, flue gas forms district of local decompression when flowing through disk at disk back, disk makes incoming flow flue gas form rotation simultaneously, this local eddy currents and integral cyclone effect exacerbate mixing of ammonia/air Mixture and flue gas greatly, effectively can shorten ammonia and evenly be diffused into distance in flue gas.But this blender must with its design ammonia-spraying grid with the use of and quantity is more, mixer design is comparatively complicated.
Publication number is that the Chinese patent of CN102389727A discloses the equal mixing device of a kind of SCR denitration quadrangle tangential circle formula ammonia-flue gas, comprise ammonia-spraying grid and more than one group static mixer, described ammonia-spraying grid comprises the cylindrical spout by matrix arrangement, and described static mixer comprises two to above static mixing plate; The smooth surface deflector that the built-in n block of described nozzle is made up of four edges; The reference edge of all static mixing plates is in the same plane, and all static mixing plates are equal with the angle of this plane, and the reference end points of all static mixing plates coincides with a bit, and the reference edge of two paired static mixing plates is located along the same line.Can make ammonia-flue gas after the disturbance of static mixer, compared with the mixed effect forming quadrangle tangential circle formula in short distance.Because this blender blade size is relatively large, comparatively large disturbances is produced to flow field, downstream.
Mandate publication number is that the Chinese patent of CN201200864Y discloses a kind of SCR denitration system X-shaped static mixer, it is characterized in that, described SCR denitration system X-shaped static mixer is rearranged by single blender plate, single blender plate is X-shaped plate, corner is circular or regular polygon, below upper and side is elliptic arc or arbitrary curve, plate face is opened two through holes, 3 ~ 20 blender plates are adopted to be arranged as one group, composition static mixer, this static mixer is in tilted layout at flue center, is fixed on above ammonia-spraying grid.This static mixer is owing to adopting larger blender device plate, and blender plate is all tilted to same direction, makes flow field, blender downstream uneven, makes flue gas still larger in the velocity deviation at SCR reactor inlet place.
Summary of the invention
The invention provides the equal mixing device of a kind of ammonia-flue gas, there is the advantage that structure is simple, strengthen mixed process, the even distribution of flue gas ammonia can be strengthened, improve denitration efficiency.
The technical solution adopted for the present invention to solve the technical problems is:
The equal mixing device of a kind of ammonia-flue gas, comprise at least one group of static mixer be arranged in flue, often organize static mixer to be made up of 4 mixer units, each mixer unit is made up of the mixed plate blade that two intersect, and mixed plate blade becomes 30 ° ~ 60 ° angles with flue gas flow direction.Often organizing static mixer spatially becomes counterclockwise (or clockwise) to arrange with 4 mixed plate blades that center is adjacent, and 4 mixed plate blades of periphery spatially then form clockwise the arrangement form of (or counterclockwise).Flue gas is through often organizing static mixer, except the local eddy currents that each mixed plate blade is formed, the adjacent 4 pieces of mixed plate blades in center are then formed counterclockwise (or clockwise) eddy flow whirlpool, 4 pieces of peripheral mixed plate blades then produce rightabout eddy flow whirlpool, thus on flue gas flow direction, form the contrary double vortex flow in direction; The mixing of inverse double-rotation eddy current is strong, enhances mixed process, ammonia is uniformly distributed, shorten simultaneously and reach ammonia homogenising target required separation distance, improve denitration efficiency; The pressure drop caused is less, and energy utilization efficiency is high.The group number of static mixer can be 1,1.5,2,2.5,3,3.5,4,4.5 and 5, and more than 5.
As preferably, the mixed plate blade of described mixer unit is fixed in flue by support bar, and the two ends of support bar are fixed on flue sidewall, every root support bar is fixed two mixer units.Described mixer unit is fixed in flue by support bar, and to improve stability, support bar can be carbon steel pipe, carbon steel rod, stainless steel tube or stainless steel bar etc.
As preferably, often organize 4 mixer unit circular array distributions of static mixer.Further preferred version is, every block mixed plate blade is equal with the angle in flow of flue gas direction.
As preferably, the coverage rate of described static mixer is 20% ~ 60%.The number of described static mixer group number is arranged according to flue size, and when flue size length-width ratio is larger, now, mixed plate blade area is comparatively large, then need the blender group number negligible amounts arranged.Otherwise when flue size length-width ratio is less, mixed plate blade area is relatively little, therefore need corresponding increase static mixing group number.Need in actual applications to arrange static device group number according to flue Sizes, for the mixed effect making reducing agent ammonia and flue gas reach desirable, thus make the flue gas before entering SCR reactor and ammonia obtain higher uniformity, cost-saving as far as possible again, need the coverage rate of conservative control static mixer, preferably, the coverage rate of described static mixer is 20% ~ 60%, more preferably, the coverage rate of described static mixer is 30% ~ 40%, described static mixer group number is 1 ~ 5, the coverage rate of described static mixer refers to that static mixer accounts for the percentage of flue cross-sectional area at the planimetric area of flue cross section.
As preferably, described mixed plate blade is rectangle, semicircle, trapezoidal, half elliptic or polygon.In order to strengthen mixed effect and process easy for installation, described mixed plate blade generally adopts rectangle, also can adopt other shapes such as trapezoidal, oval according to actual needs.
As preferably, 1m ~ 3m place above the ammonia-spraying grid that described static mixer is arranged on SCR denitration system.In actual mechanical process, according to flue size, ammonia-spraying grid nozzle quantity etc., equal mixing device optimum should be calculated by CFD and is installed on Hmm place above ammonia-spraying grid.
When the equal mixing device of ammonia-flue gas of the present invention runs in SCR flue gas denitrification system, ammonia and flue gas are when each organizes static mixer, except producing except local eddy currents at each mixed plate blade, the more important thing is that spatially the adjacent 4 pieces of mixed plate blades in center produce counterclockwise (or clockwise) strong eddy flow whirlpool, direction, the ammonia and the flue gas that then flow through peripheral 4 pieces of mixing version blades then produce clockwise (or counterclockwise) eddy flow whirlpool, direction, like this under the strong immixture in two reverse eddy flow whirlpools, ammonia just can mix in shorter distance with flue gas, improve denitration efficiency, and because mixed plate blade lean direction is different, therefore obviously can reduce the inhomogeneities in flow field at SCR reactor inlet, reduce flow field perturbation.Compared with prior art, the present invention has the following advantages:
(1) structure is simple, processing, easy for installation;
(2) strong inverse double-rotation stream whirlpool can be formed, enhance mixed process, ammonia is uniformly distributed, improves denitration efficiency;
(3) wide accommodation, can mate with common all kinds of ammonia-spraying grids and use.
(4) shorten and reach ammonia homogenising target required separation distance;
(5) pressure drop caused is less, and energy utilization efficiency is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the present invention;
Fig. 2 is the left TV structure schematic diagram of Fig. 1;
Fig. 3 is the main TV structure schematic diagram of Fig. 1;
Fig. 4 is embodiment of the present invention downstream different distance velocity contour;
Fig. 5 is embodiment of the present invention first floor catalyst inlet ammonia density distribution map;
Fig. 6 is two groups of static mixer structure schematic diagrames of the present invention;
Fig. 7 is the top view of Fig. 6;
Wherein, the housing line in Fig. 1,2,3,6,7 is the outline line of flue;
In figure: 1, static mixer, 2, support bar, 3, mixer unit, 4, mixed plate blade, 5, spray ammonia arm, 6, flue, 7, spray ammonia mother pipe.
Detailed description of the invention
Below by specific embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.Should be appreciated that enforcement of the present invention is not limited to the following examples, any pro forma accommodation make the present invention and/or change all will fall into scope.
Embodiment 1
As shown in Figure 1, Figure 2, Figure 3 shows, for the equal mixing device of ammonia-flue gas (hereinafter referred to as equal mixing device) in certain thermal power plant SCR flue gas denitrification system, comprise 3.5 groups of static mixers 1, often organize static mixer to be made up of 4 mixer units 3, each mixer unit is made up of the mixed plate blade 4 that two intersect.The mixed plate blade 4 of mixer unit is fixed in flue 6 by support bar 2, and the two ends of support bar are fixed on flue sidewall, every root support bar is fixed two mixer units.In Fig. 1, the below of equal mixing device is the ammonia-spraying grid of SCR flue gas denitrification system, and ammonia-spraying grid is combined by the female pipe 7 of spray ammonia spraying ammonia arm 5 and be connected with spray ammonia arm.The coverage rate of static mixer 1 on air flue horizontal cross section is 31.1%, mixed plate blade 4 arranged crosswise that mixer unit 3 is the rectangle of 2:1 by 2 length-width ratios forms, and mixed plate blade and flue gas flow direction angle at 45 °, 1.5m place above the ammonia-spraying grid that static mixer 1 is arranged in SCR flue gas denitrification system.
4 the mixer unit circular array distributions often organizing static mixer of equal mixing device, namely each mixed plate blade 4 is to obtain the position of the mixed plate blade adjacent with this mixed plate blade behind the center of static mixer spatially half-twist, two groups of static mixer structure schematic diagrames as shown in Figure 6 and Figure 7.Every block mixed plate blade is equal with the angle in flow of flue gas direction.
Apply the SCR flue gas denitrification system of above-mentioned static mixer 1, flue gas flows into flue from flue entrance from bottom to top along the direction of arrow shown in Fig. 1, under deflector effect in SCR flue gas denitrification system, flue gas flow velocity in flue cross section, equal mixing device upstream is even.When flue gas flows through and often organizes static mixer, inverse double-rotation stream whirlpool (Fig. 4 is blender downstream different distance velocity contour) is formed in the downstream of static mixer, the strong lateral velocity of eddy current impels ammonia and flue gas Homogeneous phase mixing, and then discharges from exhanst gas outlet after deflector, flow straightening grid, catalyst layer.Numerical computations shows, and ammonia-spraying grid upstream speed is 15.5m/s, first floor catalyst layer entrance relative velocity deviation Cv=6.9%, and relative concentration deviation (ammonia mixes sexual deviation with flue gas) Cv=2.0%(is as Fig. 5), static mixer resistance is 60Pa.Relative standard deviation computational methods are as follows:
，
Wherein:
，
，
-cross section relative standard deviation, %;
-cross section standard deviation;
-cross section mean value.
Embodiment 2
Be applied in another thermal power plant SCR flue gas denitrification system by equal mixing device in the present invention, comprise 3 groups of static mixers, often organize static mixer and comprise 4 static mixer unit, each static mixer unit comprises 2 mixed plate blade compositions.The fixed form of mixed plate blade is identical with the fixed form of embodiment 1.Due to ammonia in this SCR system and flue gas to mix distance shorter, therefore the coverage rate of adopted static mixer on air flue horizontal cross section is higher, reach 59.6%, the rectangle mixed plate blade arranged crosswise that mixer unit is 1.5:1 by length-width ratio forms, and mixed plate blade becomes 60 ° of angles with flue gas flow direction, 3.0m place above the ammonia-spraying grid that this equal mixing device is arranged in SCR flue gas denitrification system.
Drawn by modeling numerical simulation calculation, at first floor catalyst layer entrance relative velocity deviation Cv=7.3%, relative concentration deviation Cv=3.1%, static mixer pressure reduces to 135Pa, meets the requirement of SCR system performance design completely.
Embodiment 3
This equal mixing device is adopted in another thermal power plant SCR flue gas denitrification system, include 2.5 groups of static mixers, often organize static mixer to be made up of 4 static mixers equally, the mixed plate blade arranged crosswise that each static mixer unit is 2.4:1 by two length-width ratios forms, and mixed plate blade becomes 30 ° of angles with flue gas flow direction, its mounting means is roughly the same fixed in flue with embodiment 1 and embodiment 2.The coverage rate of this static mixer on air flue horizontal cross section is 21.2%, and blender cloth is setting in 2.0m place above the ammonia-spraying grid of SCR flue gas denitrification system.
By to this SCR flue gas denitrification system modeling and analog computation obtains result can find out, although the coverage rate of this static mixer is lower, blade dimensions is relatively little, but still reach 3.5% in the relative concentration deviation of first floor catalyst inlet, velocity deviation is 5.6%, static mixer pressure drop is 36Pa, fullys meet desired design target.
By the result explanation of above-described embodiment, the inverse double-rotation stream ammonia-flue gas mixing arrangement wide accommodation of SCR denitration system of the present invention and effectively can improve the mixing uniformity of ammonia and flue gas, in lower drag pressure drop situation, improve the denitration efficiency of SCR system, and can effectively reduce the escaping of ammonia rate.
Described mixed plate blade is rectangle, semicircle, trapezoidal, half elliptic or polygon.Above-described embodiment is three kinds of preferably schemes of the present invention, not does any pro forma restriction to the present invention, also has other variant and remodeling under the prerequisite not exceeding the technical scheme described in claim.
Claims (5)
1. the equal mixing device of ammonia-flue gas, it is characterized in that: comprise at least one group of static mixer be arranged in flue, often organize static mixer to be made up of 4 mixer units, each mixer unit is made up of the mixed plate blade that two intersect, and mixed plate blade becomes 30 ° ~ 60 ° angles with flue gas flow direction, often organize 4 mixer unit circular array distributions of static mixer.
2. the equal mixing device of ammonia-flue gas according to claim 1, it is characterized in that: the mixed plate blade of described mixer unit is fixed in flue by support bar, the two ends of support bar are fixed on flue sidewall, every root support bar are fixed two mixer units.
3. the equal mixing device of ammonia-flue gas according to claim 1 and 2, is characterized in that: the coverage rate of described static mixer is 20% ~ 60%.
4. the equal mixing device of ammonia-flue gas according to claim 1, is characterized in that: described mixed plate blade is rectangle, semicircle, trapezoidal, half elliptic or polygon.
5. the equal mixing device of ammonia-flue gas according to claim 1, is characterized in that: 1m ~ 3m place above the ammonia-spraying grid that described static mixer is arranged on SCR denitration system.
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| CN111346507A (en) * | 2020-04-10 | 2020-06-30 | 西安西热锅炉环保工程有限公司 | Denitration inlet flue full-section flue gas mixer and method |
| CN111437722A (en) * | 2020-05-14 | 2020-07-24 | 国电南京电力试验研究有限公司 | Vortex static mixer system and ammonia spraying flue gas mixing and adjusting method |
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