CN211274261U - Short mixing distance flue is with spouting static mixing arrangement of ammonia - Google Patents
Short mixing distance flue is with spouting static mixing arrangement of ammonia Download PDFInfo
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- CN211274261U CN211274261U CN201921104571.4U CN201921104571U CN211274261U CN 211274261 U CN211274261 U CN 211274261U CN 201921104571 U CN201921104571 U CN 201921104571U CN 211274261 U CN211274261 U CN 211274261U
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Abstract
The utility model discloses a short mixing distance flue is with spouting static mixing arrangement of ammonia, the device includes the flue: a plurality of separation channels arranged by adopting partition plates are arranged in the flue, and each partition plate comprises a first partition plate arranged in parallel with the axis direction of the section of the flue and a second partition plate vertical to the first partition plate; and a fixing rib disposed in the partition passage: including the fixed muscle of first fixed muscle that is used for fixed first guide plate and mutually perpendicular and the fixed muscle of second that is used for fixed second guide plate and mutually perpendicular: a first separation space is formed between the periphery of the first guide plate and the inner wall of the separation channel; a second space is formed between the periphery of the second guide plate and the inner wall of the separation channel, and the second guide plate is of a hollow structure; the first guide plate and the second guide plate are sequentially arranged from the inlet direction of the flue to the outlet direction of the flue. The device has the characteristics of small mixing distance of ammonia gas/flue gas and ideal mixing effect.
Description
Technical Field
The utility model relates to a short mixing distance flue is with spouting static mixing arrangement of ammonia.
Background
The flue gas SCR denitration device is a thermal power plant for controlling NOXImportant equipment for discharge. In recent years, with the high importance of the country on the environmental protection problem, strict environmental protection policies begin to emerge one by one, which puts higher requirements on ultra-low emission on the production of thermal power plants. In practical production processes, it is not an easy matter to achieve ultra-low emissions, which must rely on advanced SCR denitration technology, which ultimately relies on more advanced ammonia injection mixing technology. Therefore, the ammonia spraying and mixing device plays a crucial role in the production link of a thermal power plant. In a flue gas denitration system, a static mixing device is generally arranged at the downstream of an ammonia injection device, and the function of the static mixing device is to improve the uniformity of flue gas mixing and to remove NH in flue gas3/NOXThe distribution deviation of the molar ratio is controlled to be minimum, so that the real mixing of ammonia gas/flue gas is realized, the SCR denitration efficiency is further improved, and the ultralow emission is realized. Therefore, the performance of the static mixing device not only directly affects the mixing uniformity of the ammonia gas/flue gas, but also relates to important parts which can cause large pressure loss, so that the denitration efficiency is low, and economic indexes such as ammonia escape, power consumption of a draught fan and the like are achieved. Currently, static mixing devices installed downstream of ammonia injection devices are classified into the following three categories:
the first type is a static mixing device consisting of a number of folded turbulence elements, which corresponds to the number of upstream ammonia nozzles. The folding flow disturbing element is welded on a bracket in a flue, covers the cross section of the whole flue, when smoke sprayed with ammonia passes through the folding flow disturbing element, the smoke passes through the folding flow disturbing element according to an irregular path, a vortex is generated on the back side of the flow disturbing element, the flow field is disturbed, the process enables the ammonia and the smoke to be uniformly mixed, and then the whole air flow gradually returns to be calm in the flowing process of downstream equipment. This kind of static mixing device can reach satisfied mixed effect in shorter distance when the vortex component is denser, nevertheless causes the flue gas resistance loss great, will directly increase the power consumption of draught fan.
The second kind is simple vortex tube, arranges one row of pipe in spouting ammonia device low reaches promptly, receives the hindrance of a discharge vortex tube when the flue gas that has spouted the ammonia and flows through here, and the flue gas flows downstream along vortex tube both sides, produces the vortex in vortex tube dorsal side, and this process makes ammonia and flue gas obtain mixing, and this kind of static mixing device simple structure, and the flue gas resistance loss is less, nevertheless mixes the effect unsatisfactory.
The third type is a vortex mixer, which is based on the principle that a component with a proper shape (such as a triangular, circular or elliptical surface which is obliquely arranged) is placed in a flue, so that the flue gas generates a vortex, ammonia is injected into a vortex area, and the ammonia gas and the flue gas are fully mixed by utilizing the action of the vortex. Only a small number of elements, typically 2 to 10, are used across the flue cross-section, the relative size of each element, the swirl generated by the elements is large, the required mixing distance is long, and the total flow field is highly disruptive.
In summary, in the existing ammonia injection mixer, no matter a plurality of rows of rectangular blades are arranged in the flue in a staggered manner, the flue gas is refracted and mixed in the flue. Or a plurality of circular channels are arranged in the flue, a plurality of arc-shaped blades are arranged in the circular channels, the ammonia and the flue gas are intensified into turbulent flow, the mixing effect of the flue gas is improved, and the invention patent with the patent application number of 2010105942504 and named as an ammonia spraying mixer is invented and created, and discloses the ammonia spraying mixer, which comprises the following components: flue, circular passageway, blade, its characterized in that: a plurality of circular channels are arranged in the flue, and a plurality of arc-shaped blades are arranged in the circular channels. The invention also discloses an SCR automatic ammonia spraying mixer, which is characterized in that a plurality of circular guide plates are obliquely arranged in a flue, ammonia gas spray pipes are arranged at proper positions downstream of the guide plates, so that flue gas and diluted ammonia gas are completely mixed as in application number 2014206631826, the name of the invention is 'SCR automatic ammonia spraying mixer', and the SCR automatic ammonia spraying mixer comprises a flue (1), at least one spray pipe (2) for spraying liquid or gaseous ammonia is arranged in the flue (1), and the SCR automatic ammonia spraying mixer is characterized in that: the downstream of each spray pipe (2) is respectively and correspondingly provided with a circular guide plate (3), and the plane where the circular guide plate (3) is located and the cross section of the corresponding flue (1) are obliquely arranged. "all of the above ammonia injection mixers have fatal defects: the mixing distance of ammonia and flue gas is large, and the mixing effect is not ideal.
Disclosure of Invention
Based on the above-mentioned defect that prior art exists, the to-be-solved technical problem of the utility model is to provide a short mixing distance flue is with spouting ammonia static mixing device, and it has the mixing distance of ammonia gas flue gas little, mixes the comparatively ideal characteristics of effect.
In order to solve the above problems, the utility model adopts the following technical proposal:
short mixing distance flue is with spouting static mixing arrangement of ammonia includes:
flue: the flue is internally provided with a plurality of separation channels, the separation channels are arranged by adopting partition plates, the partition plates comprise first partition plates arranged in parallel with the axis direction of the cross section of the flue and second partition plates arranged perpendicular to the first partition plates, the upper ends and the lower ends of the first partition plates are respectively and fixedly connected to the upper wall and the lower wall of the flue, and the two ends of the second partition plates are respectively and fixedly connected to the inner walls of the two sides of the flue; and
set up the fixed muscle in separating the passageway: the fixed muscle is including the first fixed muscle that is used for fixed first guide plate and mutually perpendicular and the fixed muscle of second that is used for fixed second guide plate and mutually perpendicular:
a first separation space is formed between the periphery of the first guide plate and the inner wall of the separation channel; a second spacing space is formed between the periphery of the second guide plate and the inner wall of the separation channel, and the second guide plate is in a hollow annular structure;
from the flue inlet direction to its export direction, first guide plate and second guide plate set gradually.
In the above-described ammonia injection static mixing device for a short mixing distance flue, as a preferred embodiment, the diameter of the first baffle is smaller than the width of the partition passage.
In the above-described ammonia injection static mixer for a short mixing distance flue, as a preferred embodiment, the first baffle has a diameter smaller than the outer diameter of the second baffle but larger than the inner diameter of the second baffle.
In the above-mentioned ammonia injection static mixing device for a short mixing distance flue, as a preferred embodiment, the cross section of the first deflector has a circular, square or rectangular structure.
In the above-mentioned ammonia injection static mixing device for the short mixing distance flue, as a preferred embodiment, the cross section of the second guide plate, the inner periphery and the outer periphery of the hollow structure are in a circular, square or rectangular structure.
In the above-described ammonia injection static mixing device for a short mixing distance flue, as a preferred embodiment, the first fixing rib and the second fixing rib have the same structure.
In the above-described ammonia injection static mixing device for a short mixing distance flue, as a preferred embodiment, the first partitioned space is larger than the second partitioned space.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses should be used for the shorter flue of hybrid distance, and simple structure, engineering cost is low, should promote.
Drawings
FIG. 1 is a schematic diagram of: the structure of the longitudinal section of the flue of the ammonia spraying static mixing device for the short mixing distance flue in the embodiment 1 is shown schematically.
FIG. 2 is a diagram of: example 1 is a top view of section 1-3 in figure 1.
FIG. 3 is a diagram of: example 1 is a bottom view of section 1-3 in fig. 1.
In the figure: 1. a flue; 2. separating the channels; 2-1 a partition separating the channels; 3. a first baffle; 4. A second baffle; 5. a second fixing rib; 6. a first fixing rib; 1-1, a flue inlet, and mixed gas of ammonia gas and flue gas enters from the flue inlet; 1-2, a flue outlet, and discharging mixed gas of ammonia gas and flue gas; 1-3, a cross section between the first baffle and the second baffle.
Detailed Description
The following description is made in more detail through specific embodiments for a short mixing distance flue ammonia injection static mixing device provided by the present invention:
referring to fig. 1, 2 and 3, the ammonia injection static mixing device for a short mixing distance flue of the present embodiment includes: flue 1, separate passageway 2, first guide plate 3, second guide plate 4, first fixed muscle 6, the fixed muscle 5 of second, utilize baffle 2-1 (baffle 2-1 material and thickness can select for use the material and the thickness of conventional flue baffle) of flue axis direction trend at first to set up into a plurality of partition passageway with the flue inside, be provided with first guide plate 3, second guide plate 4 according to the direction from flue entry 1-1 to flue export 1-2 in proper order in each partition passageway, preferably, first guide plate 3, second guide plate 4 circulate in the direction from flue entry 1-1 to flue export 1-2 and set up, the structure is promptly: a baffle 3, a baffle 4, a baffle 3, a baffle 4 … …; the first guide plate 3 and the second guide plate 4 are respectively fixed in the separation channel 2 by a first fixing rib 6 and a second fixing rib 5.
Wherein, the flue inlet 1-1 is the inlet of the mixed gas of ammonia gas and flue gas entering the flue 1, the flue outlet 1-2 is the outlet of the mixed gas of ammonia gas and flue gas which is processed in the flue 1 and leaves the flue 1, and the cross section 1-3 in the figures 1, 2 and 3 is the cross section which is vertical to the axial direction of the flue and is arranged between the first guide plate 3 and the second guide plate 4.
Figure 2 is a top view of the arrangement in the flue as seen in the direction of the flue inlet 1-1 from the section 1-3 in figure 1. Figure 3 is a bottom view of the arrangement in the flue as seen in the direction of the flue outlet 1-2 from the section 1-3 in figure 1.
The first baffle 3 in each partition channel can be located on the same flue section or on different flue sections.
The first baffle 3 and the second baffle 4 are preferably made of wear-resistant and corrosion-resistant materials. As the shape of the first baffle 3, it may be any one of a circular shape, a square shape, a rectangular shape, and other polygonal shapes or a mixed structure shape of a combination of a plurality of shapes, preferably conforming to the shape of the flue 1 or the partition path 2.
As the shape of the second baffle 4, it must first be annular, i.e. the cross-section of the second baffle 4 is annular with a hollow structure. Secondly, the shape of the outer periphery of the cross section or the shape of the inner hollow structure can be any one of the shapes of a circle, a square, a rectangle and other polygons or a mixture of a plurality of shapes, and preferably corresponds to the shape of the flue 1 or the partition channel 2, and more preferably corresponds to the shape of the first baffle 3.
In fig. 2 and 3, the first baffle 3 is circular with a cross-sectional diameter D3, the second baffle 4 is circular with a cross-sectional shape having an internal circular hollow structure, the diameter of the internal hollow structure (i.e. the internal diameter of the annular structure) is D4, and the external diameter of the baffle (i.e. the external diameter of the annular structure) is D4.
The dimensions of the first baffle 3, the separation channel 2 and the second baffle 4 are preferably as follows: the diameter D3 of the first baffle 3 is smaller than the width of the partition channel 2, smaller than the outer diameter D4 of the second baffle 4 and larger than the inner diameter D of the second baffle 4.
As a method of disposing the first baffle 3 in the partition duct 2, any method may be employed which can fix the first baffle 3 in a direction perpendicular to the flue axis, for example, a method may be employed in which a bracket is provided so as to protrude from the flue inner wall to fix the first baffle 3, and a method may be employed in which the first baffle 3 is fixed in the partition duct 2 from two opposite sides of the first baffle 3 by using fixing ribs perpendicular to the flue axis direction; the guide plates can be fixed in the separation channel 2 from four side surfaces of the first guide plate 3 by two first fixing ribs 6 which are perpendicular to the axial direction of the flue and perpendicular to each other (see fig. 2 and 3), and when the guide plates are fixed in the separation channel 2 from the direction which is perpendicular to the axial direction of the flue and perpendicular to each other [ the fixing ribs, the partition plates and the flue can be understood as a space similar to a 'field' -shaped structure ], so that the situation that the positions of the first guide plate 3, such as overturning, swinging and inclining, are not fixed when the first guide plate is fixed only from one direction which is perpendicular to the axial direction of the flue can be avoided, and the probability that the flue generates high noise when the flue gas and the ammonia gas are really mixed is reduced. Further, it is preferable that the first fixing rib 6 is passed through the partition 2-1 such that both ends of the first fixing rib 6 are connected to one side of two first deflectors 3 located in the adjacent partition passages 2, respectively.
Similarly, as the way of arranging the second guide plate 4 in the partition channel 2, any way that the second guide plate 4 can be fixed in the direction perpendicular to the axis of the flue may be adopted, for example, a bracket may be arranged to protrude from the inner wall of the flue to fix the second guide plate 4, or a way that the guide plate is fixed in the partition channel 2 from both sides of the second guide plate 4 by using fixing ribs; it is also possible to use two mutually perpendicular second fixing ribs 5 for fixing the baffle in the partition channel 2 from four sides of the second baffle 4 (see fig. 2, 3). Further, it is preferable that the second fixing rib 5 is passed through the partition 2-1 such that both ends of the second fixing rib 5 are connected to one side of two second guide plates 4 located in the adjacent partition lane 2, respectively.
The fixing rib for fixing the first baffle 3 and the second baffle 4 is generally in the form of a rope, and may be in the form of a cylinder or a strip. The fixed ribs and the guide plate are fixedly connected together by welding. Preferably, the first fixing rib 6 and the second fixing rib 5 are made of materials which are wear-resistant, corrosion-resistant, and the smoke ammonia gas is not easy to adhere.
The working process of the present invention will be briefly described below.
Through the configuration relationship of the guide plate, the partition plate and the flue, a first separation space is formed between the periphery of the first guide plate 3 and the inner wall of the separation channel where the first guide plate is located; and a second spacing space is formed on the periphery of the second guide plate 4 and the inner wall of the separation channel where the second guide plate is positioned, and the first spacing space is larger than the second spacing space.
The mixed gas of the flue gas and the ammonia gas sequentially passes through the first guide plate 3 and the second guide plate 4, the flue gas generates a plurality of violent gas vortexes under the action of the guide plates to accelerate the mixing process, and meanwhile, the mixed gas is subjected to twice shunting through the first spacing space and the second spacing space and then is converged and rotated in the hollow structure of the second guide plate under the superposition and matching action of the first guide plate 3 and the second guide plate 4; compared with the turbulence pipe arranged in the flue, the flue gas resistance loss is small, and the mixing effect is more ideal; compared with the vortex mixer arranged in the flue, the vortex mixer has the advantages of small generated vortex, short required mixing distance and small damage to the whole flow field; the short mixing distance flue of this embodiment has strengthened the mixed effect with spouting ammonia static mixing arrangement, has effectively ensured the homogeneity that ammonia and flue gas mix, and the mixed effect is comparatively ideal.
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes, modifications and/or alterations to the present invention may be made by those skilled in the art after reading the technical disclosure of the present invention, and all such equivalents may fall within the scope of the present invention as defined by the appended claims.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Claims (7)
1. Short mixing distance flue is with spouting static mixing arrangement of ammonia, its characterized in that includes:
flue: the flue is internally provided with a plurality of separation channels, the separation channels are arranged by adopting partition plates, the partition plates comprise first partition plates arranged in parallel with the axis direction of the cross section of the flue and second partition plates arranged perpendicular to the first partition plates, the upper ends and the lower ends of the first partition plates are respectively and fixedly connected to the upper wall and the lower wall of the flue, and the two ends of the second partition plates are respectively and fixedly connected to the inner walls of the two sides of the flue; and
set up the fixed muscle in separating the passageway: the fixed muscle is including the first fixed muscle that is used for fixed first guide plate and mutually perpendicular and the fixed muscle of second that is used for fixed second guide plate and mutually perpendicular:
a first separation space is formed between the periphery of the first guide plate and the inner wall of the separation channel; a second spacing space is formed between the periphery of the second guide plate and the inner wall of the separation channel, and the second guide plate is in a hollow annular structure;
from the flue inlet direction to its export direction, first guide plate and second guide plate set gradually.
2. The ammonia injection static mixing device for the short mixing distance flue according to claim 1, wherein: the diameter of the first baffle is less than the width of the partition channel.
3. The ammonia injection static mixing device for the short mixing distance flue according to claim 1, wherein: the diameter of the first baffle is less than the outer diameter of the second baffle but greater than the inner diameter of the second baffle.
4. The ammonia injection static mixing device for the short mixing distance flue according to claim 1, 2 or 3, wherein: the cross section of the first guide plate is of a round, square or rectangular structure.
5. The ammonia injection static mixing device for the short mixing distance flue according to claim 1 or 3, characterized in that: the cross section of the second guide plate, the inner periphery and the outer periphery of the hollow structure are in circular, square or rectangular structures.
6. The ammonia injection static mixing device for the short mixing distance flue according to claim 1, wherein: the first fixing rib and the second fixing rib are identical in structure.
7. The ammonia injection static mixing device for the short mixing distance flue according to claim 1, wherein: the first spacing is greater than the second spacing.
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| CN201921104571.4U CN211274261U (en) | 2019-07-15 | 2019-07-15 | Short mixing distance flue is with spouting static mixing arrangement of ammonia |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252168A (en) * | 2019-07-15 | 2019-09-20 | 国电龙源节能技术有限公司 | Short mixing is apart from flue spray ammonia static mixing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252168A (en) * | 2019-07-15 | 2019-09-20 | 国电龙源节能技术有限公司 | Short mixing is apart from flue spray ammonia static mixing device |
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Address after: 102200 room 5413, building 305, Guodian New Energy Technology Research Institute, future science city, Beiqijia Town, Changping District, Beijing Patentee after: Guoneng Longyuan Lantian Energy Saving Technology Co.,Ltd. Address before: Room 1205, building 1, courtyard 16, Middle West Fourth Ring Road, Haidian District, Beijing 100039 Patentee before: GUODIAN LONGYUAN ENERGY SAVING TECHNOLOGY Co.,Ltd. |
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