CN111974216A - Mixing device for SCR flue gas denitration system - Google Patents
Mixing device for SCR flue gas denitration system Download PDFInfo
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- CN111974216A CN111974216A CN202010589161.4A CN202010589161A CN111974216A CN 111974216 A CN111974216 A CN 111974216A CN 202010589161 A CN202010589161 A CN 202010589161A CN 111974216 A CN111974216 A CN 111974216A
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- toothed plate
- smoke
- flue gas
- toothed
- fins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The invention discloses a mixing device for an SCR flue gas denitration system, which comprises a first toothed plate and a second toothed plate; the first toothed plates and the second toothed plates are arranged in the flue in a staggered mode in pairs; the first toothed plate and the second toothed plate are formed by connecting fins, and the included angle between every two adjacent fins is 40-140 degrees; the fins are in a parallelogram structure. The invention divides and deflects the horizontally flowing smoke through the first toothed plate and the second toothed plate to accelerate the smoke through the contracted smoke channel formed between the first toothed plate and the second toothed plate, the deflection directions of the adjacent smoke channels are opposite (one is deflected upwards and the other is deflected downwards) to form cross flow, the smoke is promoted to generate vortex in the downstream flowing process, the mixing and homogenization of the smoke are further promoted, the full coverage of the smoke section and no dead angle can be realized, the smoke-liquid separator is particularly suitable for mixing the smoke flows with obvious layering in temperature, concentration or speed, and simultaneously, partial smoke and dust can be effectively separated.
Description
Technical Field
The invention belongs to the technical field of flue gas treatment, and particularly relates to a mixing device for an SCR flue gas denitration system.
Background
The performance of the SCR flue gas denitration system is closely related to the velocity distribution, ammonia nitrogen molar ratio distribution and temperature distribution of a catalyst inlet. The speed distribution is uneven, the low-speed backflow area is easy to generate dust deposition and blockage, the high-speed area is easy to generate catalyst abrasion, and the service life of the catalyst is seriously shortened; the ammonia nitrogen molar ratio distribution is uneven, the supply of local reducing agent is excessive, the ammonia escape exceeds the standard, even the tail air preheater is seriously blocked, and the power consumption of a draught fan is increased; the temperature distribution is uneven, the operation of the catalyst deviates from the optimal temperature range, and the ammonia escape exceeds the standard and even the catalyst is deactivated and blocked due to the local serious low temperature. Aiming at the speed distribution, flow equalizing devices such as a guide plate, a rectifying grid and the like are generally arranged at the turning and variable cross section of the flue for adjustment; and aiming at ammonia nitrogen molar ratio distribution and temperature distribution, the uniformity is improved by optimally designing an introduction mode and additionally arranging a mixing device. Under the transformation situation of ultralow emission of flue gas, especially for a denitration system with efficiency not lower than 90%, the optimal design of a mixing device becomes the key of transformation.
In the prior art, CN106731827A discloses an AIG upstream flue gas self-mixing device in a large range, which has a first flue gas inlet located on one side of a flue, a second flue gas inlet located on the other side of the flue, a flue gas outlet, and a plurality of layers of flue gas channels spaced from each other, wherein the odd-numbered layer flue gas channels are communicated with the first flue gas inlet, the even-numbered layer flue gas channels are communicated with the second flue gas inlet, and the flue gas is fully mixed by alternately changing the flow directions of the air flows on the two sides of the flue. But the flue space occupied by the mixing device is large, and the mixing distance is relatively long.
CN101450293A discloses a fin type blunt body static mixing device, which is characterized in that a group of triangular blunt bodies transversely placed is arranged in the vertical direction of a horizontal flue, the tips of the blunt bodies are arranged facing the wind, a plurality of rectangular fins forming a certain deflection angle with the flow direction of flue gas are uniformly arranged on the upper and lower surfaces, and the deflection directions of the fins on adjacent blunt bodies are opposite and alternately arranged. The flue gas is accelerated and deflected through the free channels between adjacent bluff bodies, and mixing is achieved. But the stirring and mutual mixing of the smoke in a local area can be realized, and the mixing effect is relatively insufficient.
Disclosure of Invention
Aiming at the problems, the invention provides a mixing device for an SCR flue gas denitration system, which can realize full mixing of flue gas and improve denitration efficiency.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a mixing arrangement for SCR flue gas deNOx systems which characterized in that: comprises a first toothed plate and a second toothed plate; the first toothed plates and the second toothed plates are arranged in the flue in a staggered mode in pairs; the first toothed plate and the second toothed plate are formed by connecting fins, and the included angle between every two adjacent fins is 40-140 degrees; the fins are of a parallelogram structure.
Further, the first toothed plate and the second toothed plate respectively comprise 6-20 fins, and the number of the specific fins is selected according to the width size of the flue.
Furthermore, the first toothed plate and the second toothed plate are obliquely arranged in the flue, and the included angle between the first toothed plate and the flue gas flowing direction is 20-55 degrees.
Furthermore, the heights of the first toothed plate and the second toothed plate are 1/6-1/2 of the height of the flue, and the specific heights of the first toothed plate and the second toothed plate are reasonably selected in combination with the height size of the flue and the flow layering condition of the flue gas.
Furthermore, the flue gas flowing horizontally is divided and deflected through the first toothed plate and the second toothed plate, so that the flue gas is accelerated through a contracted flue gas channel formed between the first toothed plate and the second toothed plate, deflection directions of adjacent flue gas channels are opposite (one is deflected upwards, and the other is deflected downwards), cross flow is formed, and the flue gas is promoted to generate vortexes in the downstream flowing process to further promote mixing and homogenization of the flue gas.
Compared with the prior art, the invention has the following advantages and effects: the invention can realize the full coverage of the flue gas section without dead angles, is particularly suitable for flue gas flow mixing with obvious layering of temperature, concentration or speed, and can effectively separate partial smoke dust.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
Fig. 2 is a schematic structural front view of the arrangement of the first and second toothed plates in the embodiment of the present invention.
Fig. 3 is a schematic top view of the arrangement of the first and second castellated plates in an embodiment of the invention.
Fig. 4 is a left side structural schematic view of the arrangement of the first toothed plate and the second toothed plate in the embodiment of the present invention.
In the figure: the device comprises a first toothed plate 1, a second toothed plate 2, a flue 3 and a fin 4.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1-4, the arrows indicate the direction of flow of the flue gas.
In this embodiment, a mixing device for an SCR flue gas denitration system includes 2 pairs of first toothed plate 1 and second toothed plate 2. The first toothed plate 1 and the second toothed plate 2 form an angle of 45 degrees with the flow direction of the flue gas; the first toothed plate 1 and the second toothed plate 2 are formed by connecting 12 fins 4 with parallelogram structures, and the included angle between every two adjacent fins 4 is 90 degrees; the first toothed plate 1 and the second toothed plate 2 have the same height, and both are 25% of the height of the flue 3.
The mixing device is arranged in a horizontal flue 3 communicated with a boiler economizer of an SCR flue gas denitration device, flue gas from the boiler economizer is fully mixed after passing through the mixing device, NOx content and flue gas temperature distribution unevenness in the flue gas caused by boiler combustion and heat exchange are eliminated, the flue gas flows through an ammonia injection device, a guide plate and a rectifying device to enter an SCR catalyst, and the relative standard deviation of the inlet flue gas temperature of the catalyst is not more than +/-10 ℃ and the relative standard deviation of concentration distribution is not more than +/-5 percent.
According to the embodiment, the flue gas can be distributed in the downstream horizontal flue 3 of the coal economizer at the upstream of the SCR ammonia injection device or in the downstream vertical ascending flue 3 of the SCR ammonia injection device according to the space condition, the section flue gas temperature and the component concentration of the flue 3, so that the flue gas can be fully mixed after passing through the mixing device.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. The utility model provides a mixing arrangement for SCR flue gas deNOx systems which characterized in that: comprises a first toothed plate (1) and a second toothed plate (2); the first toothed plates (1) and the second toothed plates (2) are arranged in the flue (3) in pairs in a staggered manner; the first toothed plate (1) and the second toothed plate (2) are formed by connecting fins (4), and the included angle between every two adjacent fins (4) is 40-140 degrees; the fins (4) are of a parallelogram structure; the first toothed plate (1) and the second toothed plate (2) are obliquely arranged in the flue (3), and the included angle between the first toothed plate (1) and the second toothed plate (2) and the flow direction of flue gas is 20-55 degrees.
2. The mixing device for the SCR flue gas denitration system of claim 1, wherein: the first toothed plate (1) and the second toothed plate (2) each comprise 6-20 fins (4).
3. The mixing device for the SCR flue gas denitration system of claim 1, wherein: the height of the first toothed plate (1) and the height of the second toothed plate (2) are 1/6-1/2 of the height of the flue (3).
4. A mixing device for an SCR flue gas denitration system according to any one of claims 1 to 3, characterized in that: the horizontally flowing smoke is divided and deflected through the first toothed plate (1) and the second toothed plate (2), so that the smoke is accelerated through a contracted smoke channel formed between the first toothed plate (1) and the second toothed plate (2), deflection directions of adjacent smoke channels are opposite, cross flow is formed, and the smoke is promoted to generate a vortex in a downstream flowing process to further promote mixing and homogenization of the smoke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010589161.4A CN111974216A (en) | 2020-06-24 | 2020-06-24 | Mixing device for SCR flue gas denitration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010589161.4A CN111974216A (en) | 2020-06-24 | 2020-06-24 | Mixing device for SCR flue gas denitration system |
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| Publication Number | Publication Date |
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| CN111974216A true CN111974216A (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010589161.4A Pending CN111974216A (en) | 2020-06-24 | 2020-06-24 | Mixing device for SCR flue gas denitration system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201949798U (en) * | 2011-03-01 | 2011-08-31 | 南京龙源环保有限公司 | Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system |
| CN206082237U (en) * | 2016-08-22 | 2017-04-12 | 沈阳洛卡环保工程有限公司 | Static mixer and contain its deNOx systems |
| CN207385234U (en) * | 2017-08-14 | 2018-05-22 | 北京北科欧远科技有限公司 | A reverse cross static mixer for flue gas denitration system |
-
2020
- 2020-06-24 CN CN202010589161.4A patent/CN111974216A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201949798U (en) * | 2011-03-01 | 2011-08-31 | 南京龙源环保有限公司 | Flue gas mixing device in front of selective catalytic reduction (SCR) inlet in selective non-catalytic reduction/selective catalytic reduction (SNCR/SCR) combined denitration system |
| CN206082237U (en) * | 2016-08-22 | 2017-04-12 | 沈阳洛卡环保工程有限公司 | Static mixer and contain its deNOx systems |
| CN207385234U (en) * | 2017-08-14 | 2018-05-22 | 北京北科欧远科技有限公司 | A reverse cross static mixer for flue gas denitration system |
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Application publication date: 20201124 |
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