CN212492393U - Ammonia and smoke mixing turbulence generator for SCR denitration system - Google Patents
Ammonia and smoke mixing turbulence generator for SCR denitration system Download PDFInfo
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- CN212492393U CN212492393U CN202020864043.5U CN202020864043U CN212492393U CN 212492393 U CN212492393 U CN 212492393U CN 202020864043 U CN202020864043 U CN 202020864043U CN 212492393 U CN212492393 U CN 212492393U
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- ammonia
- blade
- turbulence generator
- flue gas
- smoke
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 67
- 239000000779 smoke Substances 0.000 title claims abstract description 42
- 239000003546 flue gas Substances 0.000 claims abstract description 33
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 3
- 238000010531 catalytic reduction reaction Methods 0.000 claims 1
- 235000019504 cigarettes Nutrition 0.000 abstract description 23
- 229910000069 nitrogen hydride Inorganic materials 0.000 abstract description 11
- 239000003054 catalyst Substances 0.000 abstract description 10
- 230000006872 improvement Effects 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000003517 fume Substances 0.000 description 11
- 238000005457 optimization Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- RZCJYMOBWVJQGV-UHFFFAOYSA-N 2-naphthyloxyacetic acid Chemical compound C1=CC=CC2=CC(OCC(=O)O)=CC=C21 RZCJYMOBWVJQGV-UHFFFAOYSA-N 0.000 description 3
- 231100001143 noxa Toxicity 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
The utility model provides an ammonia cigarette mixes turbulence generator for SCR deNOx systems, including the flue gas main flue, install in the flue gas main flue and spout ammonia grid and ammonia cigarette and mix turbulence generator, wherein, ammonia cigarette mixes turbulence generator and is located and spouts ammonia grid rear, be equipped with multiunit mixed blade device on the mixed turbulence generator of ammonia cigarette, every group mixed blade device is equipped with 4 clockwise distribution's blade, the blade shape is square or circular, the horizontal incline in middle part of blade, skew angle is 45, the blade has been divided into flue gas upper reaches end and flue gas low reaches end with the blade hole, 4 blades on the mixed blade device are horizontal in proper orderAnd the rotation direction is 90 degrees. Through the technical scheme of the utility model, ammonia cigarette mixing arrangement is to NH3/NOXHas stronger improvement capability of the distribution uniformity, and can lead NH in front of the first layer of catalyst3/NOXThe deviation value is reduced by more than 40%, the improvement capability of the device is less in relation to the shape of the blades, and the resistance of a denitration system is increased by additionally arranging an ammonia smoke mixing device.
Description
Technical Field
The utility model relates to a power equipment technical field, particularly, in particular to mixed turbulent flow generator of ammonia cigarette for SCR deNOx systems.
Background
The denitration SCR flue gas flow field optimization at home and abroad is only limited to design a guide plate by carrying out denitration flue gas optimization through numerical value and physical simulation, and the final effects are different. Denitration SCR receives the structural layout limit value, and denitration SCR entry flue is the horizontal arrangement, no flue uptake section, and the easier deposition of entry, there is the uneven phenomenon in the flue gas flow field simultaneously, has following drawback: 1) denitration SCR flue gas flow field is uneven, causes the denitration to spout ammonia uneven, spouts ammonia volume increase, and liquid ammonia consumption increases. 2) The ammonia escape at the outlet of the denitration SCR is increased, the generation amount of ammonium bisulfate is increased, and the corrosion and blockage of the air preheater are easily caused. 3) Aggravate denitration catalyst wearing and tearing, denitration catalyst wearing and tearing are caused easily in the high region of denitration inlet flue gas velocity of flow, and the velocity of flow crosses the low region and causes denitration catalyst to block up easily.
SUMMERY OF THE UTILITY MODEL
In order to compensate the deficiency of the prior art, the utility model provides an ammonia smoke mixing turbulence generator for SCR deNOx systems.
The utility model discloses a realize through following technical scheme: the utility model provides an ammonia cigarette mixes turbulence generator for SCR deNOx systems, including the flue gas main flue, installation ammonia injection grid and ammonia cigarette mix turbulence generator in the flue gas main flue, wherein, ammonia cigarette mixes turbulence generator and is located ammonia injection grid rear, ammonia cigarette mixes and is equipped with the mixed blade device of multiunit on the turbulence generator, every group mixes the blade device and is equipped with 4 clockwise distribution's blade, the blade shape is square or circular, the connecting rod is installed on the blade hole through the middle part both sides of blade, the middle part horizontal deflection of blade, skew angle is 45, the blade has been divided into flue gas upper reaches and flue gas low reaches end with the blade hole, 4 blades on the mixed blade device are horizontal rotation 90 in proper order.
Preferably, the blade is in the shape of a square blade with a side length of 700 mm.
Preferably, the blade shape is a circular blade having a blade diameter of 700 mm.
Preferably, the ammonia smoke mixing turbulence generator is 13700mm long and 3350mm wide.
Preferably, the ammonia fume mixing turbulence generator is positioned behind the ammonia injection grid at a distance of 1.5 m.
The utility model discloses owing to adopted above technical scheme, compare with prior art and make it have following beneficial effect: firstly, the ammonia-smoke mixing device has weak improvement capability on speed deviation and has close relation with the shape of the blade of the ammonia-smoke mixing device, and improper selection of the shape of the blade can cause the uniformity of the speed field of smoke to be poor. Second, ammonia and smoke mixing device is to NH3/NOXThe improvement capability of the distribution uniformity is stronger, the deviation value of NH3/NOX before the first layer of catalyst can be reduced by more than 40 percent, and the improvement capability and the blade shape have smaller relation. Thirdly, the resistance of the denitration system can be increased by additionally arranging the ammonia-smoke mixing device, but the influence caused by the resistance of the denitration system can be reduced by improving flow fields of other areas, wherein the resistance increased by the circular blade mixer is smaller than that of the square blade mixer. To sum up, the circular blade ammonia fume mixing spoiler is more suitable for a denitration system than the square blade ammonia fume mixing spoiler.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of the present invention during assembly;
FIG. 2 is a schematic structural diagram of an ammonia fume mixing spoiler with square blades;
FIG. 3 is a schematic structural diagram of a circular blade ammonia fume mixing spoiler;
FIG. 4 is a schematic structural view of a circular blade;
FIG. 5 is a schematic structural view of a square blade;
FIG. 6 is a velocity cloud plot of a non-ammonia smoke mixing turbulator;
FIG. 7 is a velocity cloud diagram of an ammonia fume mixing turbulator with square blades;
FIG. 8 is a velocity cloud diagram of an ammonia fume mixing turbulator with circular blades;
FIG. 9 shows an ammonia-smoke-free hybrid spoiler NH3/NOXA distribution cloud picture;
FIG. 10 shows an ammonia-smoke mixing spoiler NH with square blades3/NOXA distribution cloud picture;
FIG. 11 shows an ammonia-smoke mixing spoiler NH with a circular blade3/NOXA distribution cloud picture;
wherein, the corresponding relationship between the reference numbers and the components in fig. 1 to 3 is:
the device comprises an ammonia smoke mixing turbulence generator 1, a blade device 2, blades 3, blade holes 4, a smoke upstream end 4-1, a smoke downstream end 4-2, a connecting rod 5, an ammonia spraying grid 6 and a smoke main flue 7.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The ammonia-smoke mixing turbulence generator for SCR denitration system according to the embodiment of the present invention is specifically described below with reference to fig. 1 to 5.
Example 1
As shown in fig. 1, fig. 2, fig. 4, the utility model provides an ammonia cigarette mixes turbulence generator for SCR deNOx systems, including flue gas main flue 7, install ammonia injection grid 6 and ammonia cigarette in the flue gas main flue 7 and mix turbulence generator 1, wherein, ammonia cigarette mixes turbulence generator 1 and is located ammonia injection grid 6 rear, ammonia cigarette mixes turbulence generator 1 and is located the rear distance of ammonia injection grid 6 and be 1.5m, ammonia cigarette mixes turbulence generator 1's length is 13700mm, the width is 3350mm, be equipped with multiunit mixed blade device 2 on the ammonia cigarette mixes turbulence generator 1, every group mixed blade device 2 is equipped with 4 clockwise distribution's blade 3, blade 3 shape is square, the length of side that blade 3 shape is square blade is 700mm, install on blade hole 4 through connecting rod 5 in blade hole 4 middle part both sides of blade 3, the horizontal deflection of blade 3, the skew angle is 45, the blade 3 divides the blade hole 4 into an upstream end 4-1 of the flue gas and a downstream end 4-2 of the flue gas, and 4 blades 3 on the mixing blade device 2 are sequentially and transversely rotated by 90 degrees.
Example 2
As shown in fig. 1, fig. 3, fig. 5, the utility model provides an ammonia cigarette mixes turbulence generator for SCR deNOx systems, including flue gas main flue 7, install ammonia injection grid 6 and ammonia cigarette in the flue gas main flue 7 and mix turbulence generator 1, wherein, ammonia cigarette mixes turbulence generator 1 and is located ammonia injection grid 6 rear, ammonia cigarette mixes turbulence generator 1 and is located the rear distance of ammonia injection grid 6 and be 1.5m, ammonia cigarette mixes turbulence generator 1's length is 13700mm, the width is 3350mm, be equipped with multiunit mixed blade device 2 on the ammonia cigarette mixes turbulence generator 1, every group mixed blade device 2 is equipped with 4 clockwise blade 3 of distributing, blade 3 shape is circular, the blade diameter that blade 3 shape is circular blade is 700mm, the middle part both sides of blade 3 are installed on blade hole 4 through connecting rod 5, the middle part horizontal deflection of blade 3, the skew angle is 45, the blade 3 divides the blade hole 4 into an upstream end 4-1 of the flue gas and a downstream end 4-2 of the flue gas, and 4 blades 3 on the mixing blade device 2 are sequentially and transversely rotated by 90 degrees.
Through the two embodiments, the velocity field analysis, ammonia nitrogen ratio concentration deviation analysis and resistance analysis are respectively carried out. The monitoring surface of the speed field deviation and the ammonia nitrogen ratio concentration deviation is arranged at the position 300 mm above the first layer of catalyst and is the same as the position of a field test point. In the solving process, a relaxation coefficient method of relaxation iteration is adopted, a first-order windward difference is adopted, and a pressure-speed coupling mode is a simple algorithm.
Velocity field analysis under different conditions
Fig. 6 to 8 are velocity clouds of the first layer catalyst before the inlet under 3 conditions. As can be seen from fig. 6, when there is no ammonia-smoke mixing device, the smoke flow field is in the shape of strips with interval flow rate, which is caused by smoke passing through a plurality of main pipes of the AIG, although the smoke passes through 2 90-degree elbows, the strip distribution of the smoke flow field cannot be changed; fig. 7 and 8 show the distribution after the ammonia fume mixing device with different shapes is installed, and it can be seen that the distribution is completely different from the flow field without the mixer, the strip distribution disappears, the scattering shape appears, and only the low flow speed appears in a local area, which is related to the increase of the turbulence intensity after the smoke passes through the mixer.
The velocity deviations under 3 conditions were calculated from the cross-sectional flow field as shown in table 1.
TABLE 1 deviation of section velocity distribution under different working conditions
As can be seen from table 1, the optimization of the flow field after the ammonia fume mixing device is added is related to the mixer shape. When the mixer is a square blade, the flow field of the flue gas is not optimized, but rather, the flow field of the flue gas tends to be poor; when the mixer is a circular blade, the mixer plays a certain optimization role in the flue gas flow field.
NH in different cases3/NOXDeviation analysis
FIG. 9 to FIG. 11 show NH before the inlet of the first layer catalyst under 3 operating conditions3/NOXAnd (4) distributing cloud pictures. As can be seen from FIG. 9, when there is no ammonia-smoke mixing device, the NH3/NOx deviation high value and deviation low value regions are large, and smoke is receivedThe obvious stripe-shaped distribution can still be seen under the influence of the AIG main pipe at the upstream of the gas; after the ammonia-smoke mixing device is adopted, NH3/NOXThe high deviation value and low deviation value areas are reduced, the distribution is in a local scattering shape, the turbulence intensity of the flue gas is increased due to the fact that the flue gas needs to flow around when passing through the mixer, and the NH of the flue gas is enabled to be combined with the original main speed direction of the flue gas3/NOXThe high and low values of the deviation are biased to a local region.
The NH3/NOx offset was calculated for 3 conditions based on the cross-sectional flow field as shown in Table 2.
TABLE 2 Cross-section NH3/NOX bias for different conditions
As can be seen from Table 2, after the ammonia-smoke mixing device is added, the first layer of catalyst inlet NH is formed3/NOXReduced deviation, i.e. improved homogeneity, on average compared to NH of ammonia-fume-free mixing devices3/NOXThe deviation value is reduced by 43.6 percent, so that the ammonia-smoke mixing device can effectively optimize NH3/NOXThe distribution uniformity further improves the denitration efficiency; in addition, a square blade mixer and a circular blade mixer are paired with NH3/NOXThe optimization capabilities of the distribution uniformity are not very different, and the two can be considered to be equivalent in this respect.
Resistance analysis under different conditions
The SCR denitration system resistance and the single mixer resistance under 3 conditions were calculated as shown in table 3. As can be seen from Table 3, the system resistance is inevitably increased after the mixer is additionally arranged, wherein the square blade mixer is additionally arranged to increase 115Pa, the circular blade mixer is additionally arranged to increase 80Pa, the system resistance is respectively increased by 11.7 percent and 8.2 percent compared with the original system resistance, and the increase range is smaller; calculating the resistance of a single mixer shows that the resistance of the square vane mixer is 185Pa, the resistance of the circular vane mixer is 155Pa, and the resistance value is larger than the resistance value added by the system after the mixer is added, and it can be inferred that after the mixer is added, although the resistance value is added by the mixer body, the flow field of other areas of the system is improved, the smoke resistance is reduced, the resistance value added by part of the mixer body is offset, wherein the resistance value of 70 Pa is offset by the square vane mixer, and the resistance value of 75 Pa is offset by the circular vane mixer. Thus, the circular blade mixer performs better in terms of drag than the square blade mixer.
TABLE 3 resistance conditions under different working conditions
Through the technical scheme of the utility model, firstly, ammonia cigarette mixing arrangement is weak to speed deviation's improvement ability, has the osculation rather than the blade shape, and improper blade shape is selected and is made the speed field homogeneity variation of flue gas poor. Second, ammonia and smoke mixing device is to NH3/NOXHas stronger improvement capability of the distribution uniformity, and can lead NH in front of the first layer of catalyst3/NOXThe deviation value is reduced by more than 40%, and the improvement capability is less related to the shape of the leaf. Thirdly, the resistance of the denitration system can be increased by additionally arranging the ammonia-smoke mixing device, but the influence caused by the resistance of the denitration system can be reduced by improving flow fields of other areas, wherein the resistance increased by the circular blade mixer is smaller than that of the square blade mixer. To sum up, the circular blade ammonia fume mixing spoiler is more suitable for a denitration system than the square blade ammonia fume mixing spoiler.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An ammonia-smoke mixing turbulence generator for an SCR (selective catalytic reduction) denitration system comprises a flue gas main flue (7) of the SCR denitration system, wherein an ammonia spraying grid (6) and an ammonia-smoke mixing turbulence generator (1) are installed in the flue gas main flue (7), the ammonia-smoke mixing turbulence generator (1) is positioned behind the ammonia spraying grid (6), a plurality of groups of mixing blade devices (2) are arranged on the ammonia-smoke mixing turbulence generator (1), each group of mixing blade devices (2) is provided with 4 blades (3) which are distributed clockwise, the blades (3) are square or circular, two sides of the middle part of each blade (3) are installed on a blade hole (4) through a connecting rod (5), the middle part of each blade (3) transversely deflects by 45 degrees, and the blade (3) divides the blade hole (4) into a flue gas upstream end (4-1) and a flue gas downstream end (4-2), 4 blades (3) on the mixing blade device (2) rotate 90 degrees horizontally in sequence.
2. An ammonia smoke mixing turbulence generator for SCR denitration system according to claim 1, characterized in that the shape of the blade (3) is a square blade with a side length of 700 mm.
3. An ammonia smoke mixing turbulence generator for an SCR denitration system according to claim 1, characterized in that the blade (3) is in the shape of a circular blade with a blade diameter of 700 mm.
4. An ammonia smoke mixing turbulence generator for an SCR denitration system according to claim 1, characterized in that the length of the ammonia smoke mixing turbulence generator (1) is 13700mm and the width is 3350 mm.
5. The ammonia smoke mixing and turbulence generator for the SCR denitration system according to claim 1, characterized in that the ammonia smoke mixing and turbulence generator (1) is located behind the ammonia injection grid (6) by a distance of 1.5 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020864043.5U CN212492393U (en) | 2020-05-21 | 2020-05-21 | Ammonia and smoke mixing turbulence generator for SCR denitration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020864043.5U CN212492393U (en) | 2020-05-21 | 2020-05-21 | Ammonia and smoke mixing turbulence generator for SCR denitration system |
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| CN212492393U true CN212492393U (en) | 2021-02-09 |
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| CN202020864043.5U Expired - Fee Related CN212492393U (en) | 2020-05-21 | 2020-05-21 | Ammonia and smoke mixing turbulence generator for SCR denitration system |
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- 2020-05-21 CN CN202020864043.5U patent/CN212492393U/en not_active Expired - Fee Related
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Granted publication date: 20210209 |