CN111437722A - Vortex static mixer system and ammonia spraying flue gas mixing and adjusting method - Google Patents

Vortex static mixer system and ammonia spraying flue gas mixing and adjusting method Download PDF

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Publication number
CN111437722A
CN111437722A CN202010405810.0A CN202010405810A CN111437722A CN 111437722 A CN111437722 A CN 111437722A CN 202010405810 A CN202010405810 A CN 202010405810A CN 111437722 A CN111437722 A CN 111437722A
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China
Prior art keywords
static mixer
flue
blades
width direction
vortex
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Pending
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CN202010405810.0A
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Chinese (zh)
Inventor
葛铭
孙俊威
陈国庆
戴维葆
何陆灿
张金祥
周振华
李泓
冯树臣
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Guodian Nanjing Electric Power Test Research Co Ltd
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Guodian Nanjing Electric Power Test Research Co Ltd
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Priority to CN202010405810.0A priority Critical patent/CN111437722A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a vortex static mixer system, which comprises a static mixer; the static mixer comprises a top surface blade fixedly arranged in the flue and peripheral side surface blades which are positioned above the top surface and distributed annularly, the peripheral side surface blades at least comprise two opposite side surface blades, and the two opposite side surface blades are hinged with the top surface blade; the two opposite side blades are provided with angle adjusting devices, and the opposite side blades can adjust the expansion angle between the opposite side blades and the top surface blades along the width direction of the flue through the corresponding angle adjusting devices. According to the invention, the inverted quadrangular frustum pyramid static mixer is adopted, the top surface smoke which is opposite to the smoke flow direction is utilized, the smoke is guided to diffuse to the periphery, the side blades arranged along the width direction of the flue can adjust the expansion angle between the side blades and the top surface blades, the vortex intensity formed after the smoke passes through is further adjusted, the mixing intensity of the smoke passing through the static mixer is adjusted, and the smoke distribution on the width of the flue is adjusted.

Description

Vortex static mixer system and ammonia spraying flue gas mixing and adjusting method
Technical Field
The invention relates to a novel vortex mixer system, which is used for a power station boiler denitration system and belongs to the technical field of boiler tail flue gas emission.
Background
The denitration treatment of flue gas is carried out by the common selective catalytic reduction denitration technology of coal-fired power plants. How to ensure that the ammonia and the flue gas are uniformly mixed becomes the technical difficulty of a denitration system. Reasonably and efficiently organizing an ammonia-flue gas flow field is the key for improving the denitration efficiency and reducing the ammonia escape. Currently, SCR systems can be divided into three configurations according to the NH3 injection mixing device: the device comprises a vortex static mixed ammonia injection grid, a linear control type ammonia injection grid and a partition control type ammonia injection grid. The vortex static mixed ammonia injection grid is widely applied due to the characteristics of simple structure, high reaction speed, low cost and the like, but the problem of poor mixing effect exists, and particularly the vortex static mixed ammonia injection grid is not uniformly distributed along the depth direction of a flue. Meanwhile, the ammonia spraying port is easy to block.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a flue gas mixing intensity adjusting device which can adjust the flue gas mixing intensity in the width direction of a flue and effectively realize the distribution uniformity of the flue gas in the width direction of the flue.
In order to achieve the above object, the present invention provides a vortex static mixer system comprising a static mixer; the static mixer comprises a top surface blade fixedly arranged in the flue and peripheral side surface blades which are positioned above the top surface and distributed annularly, the peripheral side surface blades at least comprise two side surface blades which are oppositely arranged along the width direction of the flue, and the two opposite side surface blades are hinged with the top surface blade; the two opposite side blades are provided with angle adjusting devices, and the opposite side blades can adjust the expansion angle between the opposite side blades and the top surface blades along the width direction of the flue through the corresponding angle adjusting devices.
Preferably, the static mixer is in the shape of an inverted quadrangular frustum, and the top blades and the peripheral side blades enclose the inverted quadrangular frustum with an opening at the bottom.
The peripheral side blades comprise two opposite depth side blades and two opposite width side blades, and the width side blades are the side blades which are opposite along the width direction of the flue; the depth side blades are fixedly arranged in the flue through a flue cross beam and are fixedly connected with the top blades; the lower ends of the width side blades are hinged with the top blades; the angle adjusting device comprises a sliding block, a telescopic screw rod and an angle locking device, wherein one end of the telescopic screw rod is fixed on the flue beam, and the other end of the telescopic screw rod is connected with the sliding block; the inner sides of the width side blades are provided with slide rails, and the slide blocks of the angle adjusting device are fixedly arranged in the slide rails corresponding to the width side blades through the angle locking device.
When the width side blades adjust the expansion angle between the width side blades and the top surface blades along the width direction of the flue, the width side blades and the depth side blades are always in a surrounding state.
The angle locking device adopts a fixed screw; the sliding rail of each width side blade is provided with a plurality of corresponding sliding rail preformed holes, the sliding block is provided with a sliding block screw hole, and the sliding block is fixed in the sliding rail by penetrating through the sliding block screw hole and the sliding rail preformed holes through a fixing screw.
The static mixers are arranged in a plurality of equal intervals along the width direction of the flue.
Preferably, the static mixers are arranged in a plurality of rows, each row is arranged in a plurality of equal intervals along the width direction of the flue, and the plurality of rows are arranged in a staggered manner along the height direction of the flue.
An ammonia spraying branch pipe is arranged above each static mixer.
Wherein, the spout of the ammonia spraying branch pipe is in a trumpet shape.
The included angle of the central line of the side blade flue hinged with the top blade is 30-60 degrees.
The invention also provides an ammonia spraying flue gas mixing and adjusting method, wherein a static mixer is arranged in the flue, and the vortex of the flue gas passing through the static mixer is adjusted by adjusting the expansion angle of the static mixer in the width direction of the flue, so that the mixing intensity of the flue gas and the upper ammonia spraying is adjusted.
The adjusting method is realized by monitoring NO in the width direction of the fluexConcentration field distribution, and adjusting the expansion angle of the static mixer in the width direction of the flue when the static mixer is at the middle position NOxWhen the concentration is too high, the expansion angle of the static mixer in the width direction of the flue is increased, and when the static mixer is at the middle position NOxWhen the concentration is too low, the expansion angle of the static mixer in the width direction of the flue is reduced.
Wherein, when the expansion angle of the static mixer in the width direction of the flue is adjusted, the angle is adjusted by 5-10 degrees every time.
And the ammonia injection is optimized and adjusted periodically when NO is in the width direction of the fluexUneven concentration distribution and incapability of further reducing NO through the opening of a manual butterfly valve of an ammonia spraying branch pipexWhen the concentration is not uniform, the expansion angle of the static mixer is adjusted when the unit is stopped for maintenance. .
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the inverted quadrangular frustum pyramid static mixer is adopted, the top surface smoke which is opposite to the smoke flow direction is utilized, the smoke is guided to diffuse to the periphery, the side blades arranged along the width direction of the flue can adjust the expansion angle between the side blades and the top surface blades, the vortex intensity formed after the smoke passes through is further adjusted, the mixing intensity of the smoke passing through the static mixer is adjusted, and the smoke distribution on the width of the flue is adjusted.
2. Through a plurality of static mixers that set up along width direction, further adjust the flue gas distribution homogeneity in the flue width direction.
3. Simultaneously in the flue different height with different degree of depth directions arrange multirow static mixer, help strengthening the mixing intensity of flue gas along flue height and degree of depth direction, be favorable to the homogeneous mixing of ammonia and flue gas.
4. According to the invention, the ammonia injection branch pipe is arranged above each static mixer, and the ammonia injection branch pipe is arranged in a bell mouth shape, so that the blockage of the nozzle is prevented.
5. The static mixer disclosed by the invention is simple in structure, can effectively improve the uniform mixing degree of ammonia gas and flue gas in a flue, and ensures the denitration efficiency.
Drawings
FIG. 1 is a schematic view of a vortex static mixer of the present invention installed in a flue;
FIG. 2 is a schematic diagram of the vortex static mixer of FIG. 1;
FIG. 3 is a schematic view of the angular locking device provided on the vortex static mixer of FIG. 2;
FIG. 4 is a schematic diagram of the distribution of the vortex static mixing system in the flue of the present invention.
In the figure, 1-inverted quadrangular frustum static mixer, 11-depth side blade, 12-width side blade, 13-top blade, 2-ammonia injection branch pipe, 3-flue beam, 4-hinge, 5-slide block, 6-slide rail, 7-telescopic screw rod, 8-angle locking device, 9-slide block screw hole and 10-slide rail reserved hole.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Examples
As shown in fig. 1, the inverted quadrangular frustum pyramid vortex static mixer system of the present embodiment adopts an inverted quadrangular frustum pyramid static mixer 1, and two side blades (i.e. two depth side blades 11 arranged oppositely) of the inverted quadrangular frustum pyramid static mixer 1 in the depth direction of the flue are fixed on a flue beam 3; the top surface blades 13 are opposite to the direction of flue gas flow and are welded with the depth side surface blades 11; two side blades (namely two width side blades 12 which are oppositely arranged) in the width direction of the flue are connected with the top blade 13 through a hinge 4, so that the expansion angle of the width side blades 12 can be adjusted (the angle between the width direction and the central line of the flue is adjusted); meanwhile, the depth side blades 11 are relatively large, so that when the width side blades 12 are expanded and adjusted outwards, the depth side blades 11 can always be in a surrounding state, and a gap is not formed, so that smoke can enter the interior of the inverted quadrangular frustum static mixer 1. The flue gas flows through the inverted quadrangular frustum pyramid mixer 1 and then diffuses to the periphery and forms a vortex behind the mixer, and mixed gas of ammonia gas and air sprayed from the ammonia spraying branch pipe 2 is sucked.
As shown in fig. 2, a slide rail 6 and a slider 5 disposed in the slide rail 6 are disposed inside the width-side blade 12. The sliding blocks 5 are connected to the flue beam 3 by telescopic screws 7, so that the width-side vanes 12 are fixed to the flue beam 3. The expansion angle of the width side blade 12 is adjusted by driving the slide block 5 to move on the slide rail 6 by the extension or contraction of the telescopic screw 7.
Simultaneously in order to avoid the influence of flue gas to width side blade 12 expansion angle, still be provided with angle locking device 8 on falling four prismatic table static mixer 1, this angle locking device 8 adopts the fixed screw, as shown in fig. 3, be equipped with a plurality of slide rail preformed holes 10 that correspond on the slide rail of each width side blade, be equipped with slider screw hole 9 on the slider, after width side blade 12 expansion angle regulation finishes, pass slider screw hole 9 and the slide rail preformed hole 10 of relevant position department through the fixed screw and fix the slider in the slide rail.
In the embodiment, the four side surfaces (including the width side surface blades 12 and the depth side surface blades 11) of the inverted quadrangular frustum static mixer are arranged at 45 degrees with the central line in an initial state, so that the ammonia gas sprayed by the ammonia spraying branch pipe can be sucked by vortex generated behind the mixer, and the resistance of a flow field can be prevented from being greatly increased.
Simultaneously in order to strengthen flue gas mixing intensity on the flue width direction, as preferred scheme, according to flue actual width, set up a plurality of falling quadrangular frustum of a prism static mixers along flue width direction equidistant, through NOxThe concentration field measurement results were used to adjust the expansion angle of the width-side blades 12 of each inverted quadrangular frustum static mixer.
In order to further enhance the flue gas mixing strength of the flue gas in the depth direction and the height direction of the flue, as a preferred scheme, multiple rows of inverted quadrangular frustum pyramid static mixers are arranged along the depth direction and the height direction of the flue gas in a staggered manner (each row of inverted quadrangular frustum pyramid static mixers are provided with multiple quadrangular frustum pyramid static mixers along the width direction of the flue, in this embodiment, one row and two rows of inverted quadrangular frustum pyramid static mixers are arranged along the depth direction and the height direction of the flue gas in a staggered manner, and each row of inverted quadrangular frustum pyramid static mixers 1 is arranged along the width direction of the flue gas), as shown in fig. 4.
In this embodiment fall four prismatic table static mixer and can realize the vortex of flue degree of depth direction and mix, can realize the vortex of flue width direction again through adjusting the blade angle and mix, help solving the ubiquitous uneven problem of mixing along flue degree of depth and width direction of power plant boiler vortex hybrid deNOx systems at present. To the problem of the dark broad of denitration flue, can realize flue degree of depth and width direction's accurate regulation through arranging multirow inverted quadrangular platform static mixer. To the uneven problem of flue width direction mixture, can shut down to overhaul the static mixer blade expansion angle of adjustment inverted quadrangular frustum pyramid through the unit and come accurate regulation, reform transform with low costs.
In use, to NOxMeasurement of concentration field when NO appears in width directionxWhen the uneven and unable condition through spouting ammonia branch pipe valve opening regulation further reduction unevenness of concentration field distribution, the adjustment of shutting down: NOxWhen the concentration in the middle of the vortex mixer in the concentration field is too high, the width side blades 12 of the static mixer which are arranged in the corresponding width direction and are close to the two inverted quadrangular frustum pyramid shaped parts are expanded outwards for adjusting the angle to be 5-10 degrees; NOxWhen the middle concentration of the middle vortex mixer in the concentration field is too low, the width side blades 12 of the two adjacent inverted quadrangular frustum static mixers arranged in the corresponding width direction are inwards contracted and adjusted by 5-10 degrees; after the first adjustment, NO still appears in the width direction, e.g. after operationxWhen the concentration field is distributed unevenly, when the machine is stopped and adjusted again, the width side surface blade is finely adjusted, the adjusting angle is 2-3 degrees, and the adjusting direction is the same as the first adjusting direction; up to NO in the width directionxThe concentration field is distributed uniformly.
In the embodiment, the ammonia spraying branch pipe is in a novel bell mouth shape, and an integrated casting process is adopted. The novel nozzle structure can effectively prevent the problems of dust accumulation and blockage.
The technical solutions of the present invention are not limited to the above embodiments, and all technical solutions obtained by using equivalent substitution modes fall within the scope of the present invention.

Claims (14)

1. A vortex static mixer system, characterized by: the vortex static mixer system comprises a static mixer; the static mixer comprises a top surface blade fixedly arranged in the flue and peripheral side surface blades which are positioned above the top surface and distributed annularly, the peripheral side surface blades at least comprise two side surface blades which are oppositely arranged along the width direction of the flue, and the two opposite side surface blades are hinged with the top surface blade; the two opposite side blades are provided with angle adjusting devices, and the opposite side blades can adjust the expansion angle between the opposite side blades and the top surface blades along the width direction of the flue through the corresponding angle adjusting devices.
2. The vortex static mixer system of claim 1, wherein: the static mixer is in an inverted quadrangular frustum pyramid shape, and the top surface blades and the peripheral side blades enclose an inverted quadrangular frustum pyramid shape with an opening at the bottom surface.
3. The vortex static mixer system of claim 2, wherein: the peripheral side blades comprise two opposite depth side blades and two opposite width side blades, and the width side blades are the side blades which are opposite along the width direction of the flue; the depth side blades are fixedly arranged in the flue through a flue cross beam and are fixedly connected with the top blades; the lower ends of the width side blades are hinged with the top blades; the angle adjusting device comprises a sliding block, a telescopic screw rod and an angle locking device, wherein one end of the telescopic screw rod is fixed on the flue beam, and the other end of the telescopic screw rod is connected with the sliding block; the inner sides of the width side blades are provided with slide rails, and the slide blocks of the angle adjusting device are fixedly arranged in the slide rails corresponding to the width side blades through the angle locking device.
4. The vortex static mixer system of claim 3, wherein: when the width side blades adjust the expansion angle between the width side blades and the top surface blades along the width direction of the flue, the width side blades and the depth side blades are always in a surrounding state.
5. The vortex static mixer system of claim 4, wherein: the angle locking device adopts a fixing screw; the sliding rail of each width side blade is provided with a plurality of corresponding sliding rail preformed holes, the sliding block is provided with a sliding block screw hole, and the sliding block is fixed in the sliding rail by penetrating through the sliding block screw hole and the sliding rail preformed holes through a fixing screw.
6. The vortex static mixer system of any one of claims 1 to 5, wherein: the static mixers are arranged at equal intervals along the width direction of the flue.
7. The vortex static mixer system of claim 6, wherein: the static mixer is the multirow, and every row arranges a plurality ofly along flue width direction equidistance, and the multirow is along flue direction of height staggered arrangement.
8. The vortex static mixer system of claim 7, wherein: an ammonia spraying branch pipe is arranged above each static mixer.
9. The vortex static mixer system of claim 8, wherein: the nozzle of the ammonia spraying branch pipe is in a horn shape.
10. The vortex static mixer system of any one of claims 1 to 5, wherein: the included angle of the central line of the side blade flue hinged with the top blade is 30-60 degrees.
11. An ammonia spraying flue gas mixing and adjusting method is characterized in that: the adjusting method is characterized in that a static mixer is arranged in the flue, and the vortex of the flue gas passing through the static mixer is adjusted by adjusting the expansion angle of the static mixer in the width direction of the flue, so that the mixing strength of the flue gas and the upper ammonia injection is adjusted.
12. The ammonia injection flue gas mixing and conditioning method of claim 11, wherein: the regulating method is realized by monitoring NO in the width direction of the fluexConcentration field distribution, and adjusting the expansion angle of the static mixer in the width direction of the flue when the static mixer is at the middle position NOxWhen the concentration is too high, the expansion angle of the static mixer in the width direction of the flue is increased, and when the static mixer is at the middle position NOxWhen the concentration is too low, the expansion angle of the static mixer in the width direction of the flue is reduced.
13. The ammonia injection flue gas mixing and conditioning method of claim 12, characterized in that: when the expansion angle of the static mixer in the width direction of the flue is adjusted, the angle is adjusted by 5-10 degrees every time.
14. The ammonia injection flue gas mixing and conditioning method of claim 13, wherein: the ammonia injection is regularly and optimally adjusted, and NO is taken as the width direction of the fluexUneven concentration distribution and incapability of further reducing NO through the opening of a manual butterfly valve of an ammonia spraying branch pipexWhen the concentration is not uniform, the expansion angle of the static mixer is adjusted when the unit is stopped for maintenance.
CN202010405810.0A 2020-05-14 2020-05-14 Vortex static mixer system and ammonia spraying flue gas mixing and adjusting method Pending CN111437722A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113694762A (en) * 2021-08-24 2021-11-26 西安热工研究院有限公司 Self-adaptive adjustment dynamic ammonia injection mixer
CN115888465A (en) * 2022-08-29 2023-04-04 西安热工研究院有限公司 Rotary driving system suitable for long-term operation of high-temperature and high-dust flue gas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113694762A (en) * 2021-08-24 2021-11-26 西安热工研究院有限公司 Self-adaptive adjustment dynamic ammonia injection mixer
CN115888465A (en) * 2022-08-29 2023-04-04 西安热工研究院有限公司 Rotary driving system suitable for long-term operation of high-temperature and high-dust flue gas
CN115888465B (en) * 2022-08-29 2024-06-07 西安热工研究院有限公司 Rotary driving system suitable for long-term operation of high-temperature high-dust flue gas

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