CN108067050A - A kind of high-efficiency multi-stage demister - Google Patents
A kind of high-efficiency multi-stage demister Download PDFInfo
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- CN108067050A CN108067050A CN201610990960.6A CN201610990960A CN108067050A CN 108067050 A CN108067050 A CN 108067050A CN 201610990960 A CN201610990960 A CN 201610990960A CN 108067050 A CN108067050 A CN 108067050A
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- riser
- demister
- outer barrel
- wall
- rectification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
Abstract
The invention discloses a kind of high-efficiency multi-stage demisters.The demister includes several demisting components, each demisting component includes riser and outer barrel, outer barrel is arranged on the outside of riser, and, riser is fixed on tower tray with riser on the same axis, the top of riser, which is set, covers plate, bottom sets lower capping plate, air admission hole is uniformly provided on the circumference of riser lower end, the riser inner wall of air inlet position sets air inlet deflector, and the provided circumferentially about of riser upper end has rectification passage.The demister of the present invention realizes the separation of drop and gas by rectification, acceleration and shaving effect of the fluid in flow process.The demister of the present invention is simple in structure, easy for installation, less scaling, can effectively realize gas-liquid separation, reduces entrainment, is particularly suitable for the larger occasion of gas flow fluctuations.
Description
Technical field
The present invention relates to a kind of gas-liquid separation equipment, especially a kind of high-efficiency multi-stage demister.
Background technology
Substantial amounts of SO is generated in the production process of the industries such as electric power, metallurgy, petrochemical industry2With the harmful substances such as dust, bring
Serious acid rain harm and haze weather are the atmosphere pollutions of the current priority control in China.At present, field of Environment Protection generally uses
Wet desulfurizing process removes the harmful substances such as the sulfur dioxide in flue gas, i.e., sprays lye to flue gas so as to absorb or adsorb this
A little harmful substances.With a large amount of grain sizes it is about 10~60 micro- in the flue gas after the desulfurization of absorption tower however, in process of wet desulphurization
The fine drop of rice, dissolved with sulfuric acid, sulfate, SO in these drops2Deng, atmospheric environment can not only be polluted, while
More serious corrosion and fouling are caused to follow-up equipment.When therefore, using wet desulfurizing process, cleaned gas is leaving suction
Demisting is had to before receiving tower, and demister is depended on the step for demisting to complete.
Demister is generally located at the top of absorption tower, when the gas containing mist passes through demister with certain speed, meeting
Bump against with demister internal structure, and depend in its surface.Mist on demister internal structure surface, by spreading and again
The effect of power can progressively be assembled, and after weight reaches certain level, will be separated from demister internal structure, so as to real
Existing gas-liquid separation.When demister in the process of running because fouling due to resistance drop is caused to increase to predetermined value when, it is necessary to start anti-
Cleaning procedure is rinsed demister, generally, is both needed to set flooding nozzle in demister inlet end and exhaust end, at this time may
Cause serious entrainment of the gas phase to liquid phase, cause gas phase band liquid.
Common demister has mesh mist eliminator, collapser demister, rotational flow plate defroster etc..Although mesh mist eliminator energy
General mist is separated, but requires mist cleaning, air-flow velocity smaller, and resistance drop is big, service life is short, and equipment investment is big.
Demister generally all uses horizontally disposed at present, and demister gas flow direction is vertical with silk screen, when gas velocity is relatively low, the mist of entrainment
Foam inertia is small, drifts in gas, it is impossible to silk screen making contact and be removed, and due to by separation drop and gas phase in inverse
Stream flow direction, gas are also easy to produce reentrainment to drop, so that gas-liquid separation efficiency reduces, and mesh mist eliminator also has appearance
The problems such as easily blocking, pressure drop is big.The folding that direction is different, shape is different is installed inside blade type, herringbone demister
Flowing plate to form small runner, increases defogging effect, structure is more complicated, and separating effect is bad.Rotational flow plate defroster is by separating liquid
Drop is identical with gas flow, is also easy to produce reentrainment, reduces demisting efficiency, and pressure drop is big, and energy consumption is higher.
The demister element that CN200410014713.X is introduced is made of baffle plate and flue gas flow field adjustment block, and baffle plate is fixed
In flue gas flow field adjustment block, the density and shape of baffle plate change according to the flow area variation of flow field parameter everywhere, from
And the flow area of air-flow in absorption tower is made to be evenly distributed, but still do not break away from drop descent, gas-liquid counter current is existing
As being also easy to produce reentrainment.
The demister that CN200920128824.1 is introduced is made of cooler, coarse defogging device and smart demister etc., coarse defogging
Device is corrugated sheet or demisting plate, and smart demister is steel wire, which changes traditional demister drop and airflow direction is inverse
The shortcomings that stream flowing, improve demisting efficiency.But the demister structure is more complicated, makes difficulty, and as a result of silk screen
Structure, demister pressure drop is larger, is also easier to block.
A kind of straight tube shape deflector type demister that CN203724892U is introduced is made of several demisting components, each demisting
Component includes riser and outer barrel, and the circumference of riser is provided with several seams, is set on the riser circumference close to each item seam
Groove and the tangential flow guiding wing are equipped with, the tangential flow guiding wing plays guide functions, gas flow is made to change.It is being flowed over by fluid
Multiple baffling in journey realizes the separation of drop and gas, can effectively remove the smaller drop of grain size, demisting efficiency is higher.But
After gas flows through the tangential flow guiding wing, gas direction still compares diverging, not enough concentrate, and gas velocity reduce, then with outer tube inner wall
Impact force is smaller during collision, influences defogging effect.The demister, which relies primarily on baffling, changes gas direction, and then gas is with consolidating
Body wall face collides so as to fulfill gas-liquid separation, preferable for larger drop defogging effect but unknown for droplet effect
It is aobvious, and the demister structure is more complicated, the easy fouling in gap between riser and the tangential flow guiding wing.
US7618472B2 provides a kind of vane-type demister, and the demister is by structures such as corrugated sheet, tablet and louver boards
Into, and form many cavitys or runner.After gas-liquid mixture enters demister, fluid course shifts so that fluid flows to
Changed for several times, and velocity variations obtain very fast, and liquid phase is easy to separate from gas phase.The technology liquid phase and gas phase point
From in the process, can realizing gas liquid cross-flow, therefore gas phase substantially reduces the reentrainment effect of drop, but the technical pattern
Extremely complex, difficulty of processing is also bigger, and corresponding processing and fabricating expense is higher.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of high-efficiency multi-stage demister, by fluid in flow process
In rectification, acceleration and shaving effect, realize the separation of drop and gas.The demister of the present invention is simple in structure, and pressure drop is small, no
Easy fouling, it is easy for installation, entrainment is reduced, can effectively realize gas-liquid separation.
The high-efficiency multi-stage demister of the present invention includes several demisting components arranged side by side, and each demisting component includes rising gas
Pipe and outer barrel, outer barrel are arranged on the outside of riser, preferably with riser on the same axis；Riser is fixed on tower tray,
Riser bottom is less than tower tray certain distance, and the top of riser, which is set, covers plate, and bottom sets lower capping plate；It is more than tower tray
Several rectification passages are uniformly arranged on the circumference of partial riser, rectification passage is embedding along the tangential direction level of riser outer wall
Enter, side wall I and riser tube wall of the rectification passage close to outer barrel one side are tangent, and another side wall II intersects with riser tube wall, respectively
Rectification passage direction of rotation is identical；Rectification channel roof is flushed with upper capping plate, and bottom is intersected with riser tube wall；Below tower tray
Several air admission holes are uniformly provided on the circumference of partial riser, air inlet deflector is set on the riser inner wall of air inlet position.
In the demister of the present invention, the air inlet deflector is axially disposed within air inlet bore edges along riser, with a liter gas
Inside pipe wall is fixedly connected, the riser outer wall that two mid point of curve lines are done up and down in air admission hole and riser outer wall intersection
Section and the angle of the air inlet deflector plane close to air admission hole one side be γ, γ is 10 ° ~ 60 °, preferably 20 ° ~ 35 °.
In the demister of the present invention, the rectification passage generally sets 1 ~ 12, preferably 4-8.The wall of rectification passage
It is thick preferably identical with the wall thickness of riser.
In the demister of the present invention, the length l of rectification passage is the length of side wall II, and width w is rectification passage two side
Between maximum horizontal range, maximum normal distances of the height h between rectification channel roof and bottom；Wherein length l is width w's
2 ~ 5 times, be preferably 3 ~ 4 times；The cross sectional shape of rectification passage is rectangle, ellipse, circle, it is trapezoidal or semicircle etc. in one kind
Or several combinations, one or more of preferably rectangular, oval or circular combination.The size of rectification passage is according to reality
Operating mode or design requirement, are determined by those skilled in the art, and the height h of such as rectification passage is generally 20~600mm,
Preferably 100~300mm；The width w of rectification passage is generally 10~200mm, is preferably 20~100mm.Rectification passage it is total
Sectional area is 0.2 ~ 0.9 times of riser cross-sectional area, is preferably 0.3 ~ 0.6 times of riser cross-sectional area.
In the demister of the present invention, the side wall II ends of the rectification passage can flush or stretch into riser inner wall
To un-obstructed draft tube interior certain distance m, m is 0.1 ~ 0.9 times of length l, is preferably 0.3 ~ 0.6 times.As the side wall II of rectification passage
When end is flushed with riser inner wall, rectification channel bottom end is also flushed with riser inner wall；As the side wall II of rectification passage
When extending into un-obstructed draft tube interior certain distance m, rectification channel bottom end is flushed with side wall end.
In the demister of the present invention, it is 20~200mm that rectification channel bottom has certain distance A, distance A apart from tower tray, excellent
Elect 40~80mm as.
In the demister of the present invention, the air admission hole generally sets 3 ~ 12, preferably 4-8.The section shape of air admission hole
Shape is rectangle, ellipse, circle, trapezoidal or one or more of semicircle etc. combination, it is preferably rectangular, oval or circular
One or more of combination.The total sectional area of air admission hole is 0.6 ~ 1.5 times of riser sectional area, preferably 0.8 ~ 1.2 times, is had
Body size is determined according to actual operating mode or design requirement by those skilled in the art.
In the demister of the present invention, the rotation direction of each air inlet deflector is identical with rectification passage, and the shape of air inlet deflector can
Think rectangle, ellipse, circle, trapezoidal or one or more of semicircle etc. combination, it is preferably identical with the shape of air admission hole,
Air inlet water conservancy diversion plate suqare is 1.1 ~ 2 times of air inlet hole area, preferably 1.3 ~ 1.5 times.
In the demister of the present invention, lower capping plate（Riser bottom）Have a certain distance K away from tower tray, distance K for 60~
200mm is preferably 80~120mm.
In the demister of the present invention, riser and tower tray airtight connection, the diameter of riser and the percent opening of tower tray can be with
According to actual operating mode or design requirement, determined by those skilled in the art.
In the demister of the present invention, the rectification passage, upper capping plate, lower capping plate and riser can be welded on one
Rise or global formation.
In the demister of the present invention, the outer barrel is cylinder, and outer barrel diameter D is 1.5-6 times of draft tube diameter d, excellent
Elect 2-3 times as.The upper edge of outer barrel be higher by riser on along certain distance P, distance P is 1~8 times of rectification channel height h, excellent
Elect 2~5 times as.The lower edge of outer barrel has certain distance B apart from tower tray, and less than the lower edge of rectification passage, outer barrel lower edge is away from tower tray
Distance B for 5~100mm, be preferably 20~50mm.The overall height H of outer barrel is 2.5~10 times of rectification channel height, preferably
For 3~5 times.
In the demister of the present invention, the inner surface of the outer barrel sets groove and/or protrusion.Protrusion or groove and outer barrel
Axis it is parallel or can form an angle with axis.The groove or the section of protrusion can also be rectangle, triangle
Or the suitable shapes such as circle.
In the demister of the present invention, the inner surface of the outer barrel is preferably provided with the groove of cross sectional shape as shown in Figure 5,
The section of the groove is made of a circular arc and straight line section；The intersection point of wherein circular arc and outer tube inner surface circumference does circle respectively
The tangent line of arc and circumference, the angle between tangent line are α, and α is 5 ° ~ 70 °, is preferably 10 ° ~ 40 °；Circular arc and straightway intersection point place
The tangent line of the circular arc done and the angle of straightway are β, and β is 30 ° ~ 110 °, is preferably 45 ° ~ 90 °.The depth Z of groove, i.e. circular arc
With 0.1 ~ 0.7 times that the beeline on straightway intersection point to outer tube inner surface circumference is outer barrel wall thickness, preferably 0.3 ~ 0.5
Times；Arc length between the intersection point and straightway of circular arc and outer tube inner surface circumference and the intersection point of outer tube inner surface circumference is table in outer barrel
The 1/80 ~ 1/6 of face circumference.
In the demister of the present invention, the lower ending opening of the outer barrel can also set toothing or wavy shaped configuration,
It is dripped so as to be more conducive to the liquid isolated from the inner wall of outer barrel into continuous flow.
The junction of each component of demister of the present invention ensures sealing, does not generate gas leak phenomenon.
The demister of the present invention, during work, the gas of entrained drip enters in the horizontal direction from the air admission hole of tower tray lower end
Riser, gas phase flow direction is changed to tangential direction by radial direction after running into air inlet deflector, is conducive to gas along riser
Inner wall, which spirals, to be flowed up, and enhances eddy flow effect.Partial drop collides with air inlet deflector in the process, makes
Droplet adheres on air inlet deflector and coalescence, the drop of attachment become larger, its own generation of a part of larger drop
Gravity be more than gas climbing power and surface tension of liquid make a concerted effort when, drop will along air inlet baffle surface fall so as to
It is separated, that is, completes first time gas-liquid separation；The larger drop of another part then continues to flow with gas, along riser
Inner wall disc spins flow up.When the gas of entrained drip rises in riser, gas phase flow direction after capping plate is run into
It changes again, part droplet and upper capping plate collision, and then complete second of gas-liquid separation；There is the small liquid in part again simultaneously
Dripping coalescence becomes larger drop, and continues to flow with gas.The gas of entrained drip enters whole along horizontal or level of approximation direction
Circulation road, since rectification passage has certain length, and rectification passage total sectional area is less than riser cross-sectional area, script speed
The gas of the more dispersed entrained drip in direction, after rectification passage is entered, directional velocity is changed to along the direction of rectification passage,
Directional velocity comparison rule and concentration, and since circulation area reduces, the gas of entrained drip is made to enter speed after rectification passage
Increase.When the directional velocity of the gas of entrained drip changes, partial drop collides with rectification vias inner walls, and is attached to whole
It on circulation road inner wall, and then is constantly flowed through the gas blowout rectification passage of rectification passage and is fallen, complete third time gas-liquid point
From.Meanwhile in rectification passage, since the gas velocity direction of entrained drip changes, part droplet is under inertia force effect
Mutually collision occurs, droplet aggregation becomes big drop, and speed increases during the gas stream rectified passage of entrained drip, aggravation
The movement of drop, improves the probability that droplet mutually collides, and droplet is made to be easier to assemble and become big drop, and with gas
Rectification passage is flowed out with larger speed together.The gas of the entrained drip flowed out from rectification passage has larger speed, speed
Concentration is compared in degree direction, and the drop carried secretly is bigger, and continuation collides with outer tube inner wall, changes the flowing side of gas again
To that is, the gas of entrained drip is by being changed to the circumferencial direction flowing along outer tube inner wall along rectification channel direction.Due to entrainment
The gas velocity of drop is larger, and is flowed up along reeded outer tube inner wall rotation is opened up, therefore can generate obvious
Shaving effect.The shaving effect, refer to the high-speed gas of entrained drip along outer tube inner wall rotation flow up when, drop
Outer is constantly thrown toward under the action of inertia force, drop enters groove and moved along the arc section in groove, since angle α is
5 ° ~ 70 °, the arc surface that drop continues on groove can be made to do and smoothly move, between drop contact aggregation become larger, until running into
Straightway is hindered, assembles the drop to become larger and is hit strongly with straightway wall surface, and is attached to the straight line of outer tube inner wall groove
Duan Shang, drop continues to assemble and become larger, and then goes downstream along outer tube inner wall；And gas then continues to keep at a high speed along outer tube inner wall
Rotation flows up, and realizes gas-liquid separation, and reduces entrainment for the 4th time.Pass through above-mentioned rectification, acceleration and shaving
Effect makes fluid realize the separation of drop and gas in flow process.
Application of the demister of the present invention in the absorption tower using wet desulfurizing process generally enters the gas velocity of riser
For 3-20m/s, the gas velocity of rectification channel outlet is 10-40m/s, and the gas velocity of rectification channel outlet is into the gas velocity of riser
1.5 ~ 3 times.
Compared with prior art, demister of the invention has the following advantages：
1st, there is lower capping plate in riser lower end, and riser lower circumferential direction is uniformly provided with several air admission holes, the liter of air inlet position
Inner surface of trachea sets several air inlet deflectors, and after gas is made to enter riser in the horizontal direction, running into air inlet deflector makes gas phase
Flow direction is changed to tangential direction by radial direction, is conducive to gas and spirals along riser inner wall flow up, enhance eddy flow
Effect.
2nd, rectification passage has certain length, and the gas of the more dispersed entrained drip of script directional velocity is whole entering
After circulation road, directional velocity is changed to along the direction of rectification passage, directional velocity comparison rule and concentration；And rectification passage is always cut
Area is less than riser cross-sectional area, since circulation area reduces, the gas of entrained drip is made to enter speed increasing after rectification passage
Add.The section of cylinder inner surface groove is made of a circular arc and straight line section, and the high-speed gas of entrained drip are along outer barrel
When wall rotation flows up, drop is constantly thrown toward outer under the action of inertia force, and drop enters groove and along groove
Arc section moves, and since angle α is 5 ° ~ 70 °, the arc surface that drop continues on groove can be made to do smooth movement, until
Run into straightway it is hindered after go downstream along outer tube inner wall, and without dead zone exist.
3rd, by multistage demisting, efficiently achieve the effect that demisting, effectively remove the smaller liquid of grain size carried secretly in gas
Drop, demisting efficiency is high, reduces the harm to environment, plays the role of environmental protection.
4th, gas flow uniform, flow resistance is small, and resistance reduces.
5th, it is simple in structure, it is easy to make, it is not easy to plug and fouling, without backwash.
6th, water-saving result is good, and the moisture removed from the gas of entrained drip can reduce water consumption with recycling.
Description of the drawings
Fig. 1 is the demister structure diagram of the present invention.
Fig. 2 is the schematic cross-section of air admission hole and air inlet deflector.
Fig. 3 is the schematic cross-section for the demister that rectification passage is flushed with inner wall.
Fig. 4 is the schematic cross-section for the demister that rectification passage stretches into un-obstructed draft tube interior.
Fig. 5 is that section is the groove schematic diagram that circular arc and straightway are formed.
Wherein, 1- tower trays；2- riseies；3- rectification passages；4- outer barrels；Plate is covered on 5-；6- grooves；7- air inlet water conservancy diversion
Plate；8- air admission holes；Plate is covered under 9-.
Specific embodiment
The demister of the present invention is described in further detail with reference to the accompanying drawings and examples.
The high-efficiency multi-stage demister of the present invention includes several demisting components arranged side by side, and each demisting component includes rising gas
Pipe 2 and outer barrel 4, outer barrel 4 are arranged on the outside of riser 2, preferably with riser 2 on the same axis；Riser 2 is fixed on tower
On disk 1,2 bottom of riser is less than 1 certain distance of tower tray, and the top of riser 2, which is set, covers plate 5, and bottom sets lower capping
Plate 9；It is uniformly arranged several rectification passages 3 on the circumference of the riser 2 of 1 above section of tower tray, rectification passage 3 is along outside riser 2
The tangential direction of wall is horizontal embedded, and side wall I and riser 2 tube wall of the rectification passage 3 close to 4 one side of outer barrel are tangent, another side wall
II intersects with 2 tube wall of riser, and each 3 direction of rotation of rectification passage is identical；3 top of rectification passage is flushed with upper capping plate 5, bottom
Intersect with 2 tube wall of riser；Tower tray 1 is to be uniformly provided with several air admission holes 8 on the circumference of the riser 2 of lower part, at air admission hole 8
2 inner wall of riser on air inlet deflector 7 is set.
In the demister of the present invention, the rectification passage 3 generally sets 1 ~ 12, preferably 4-8.Rectification passage 3
Wall thickness is preferably identical with the wall thickness of riser 2.
In the demister of the present invention, the length l of rectification passage 3 is the length of side wall II, and width w is 3 both sides of rectification passage
Maximum horizontal range between wall, height h are the maximum normal distance between 3 top and bottom of rectification passage；Wherein length l is width
2 ~ 5 times of w are preferably 3 ~ 4 times；The cross sectional shape of rectification passage 3 is rectangle, ellipse, circle, it is trapezoidal or semicircle etc. in
One or more combination, one or more of preferably rectangular, oval or circular combination.The size of rectification passage 3 according to
Actual operating mode or design requirement, are determined by those skilled in the art, and the height h of such as rectification passage 3 is generally 20
~600mm is preferably 100~300mm；The width w of rectification passage 3 is generally 10~200mm, is preferably 20~100mm.Rectification
The total sectional area of passage 3 is 0.2 ~ 0.9 times of 2 cross-sectional area of riser, is preferably 0.3 ~ 0.6 times of 2 cross-sectional area of riser.
In the demister of the present invention, the side wall II ends of the rectification passage 3 can flush or stretch with 2 inner wall of riser
Enter to 2 inside certain distance m of riser, m is 0.1 ~ 0.9 times of length l, is preferably 0.3 ~ 0.6 times.When the side of rectification passage 3
When wall II ends are flushed with 2 inner wall of riser, 3 bottom end of rectification passage is also flushed with 2 inner wall of riser；When rectification passage 3
Side wall II when extending into 2 inside certain distance m of riser, 3 bottom end of rectification passage is flushed with side wall end.
In the demister of the present invention, it is 20~200mm that 3 distance from bottom tower tray 1 of rectification passage, which has certain distance A, distance A,
Preferably 40~80mm.
In the demister of the present invention, the air admission hole 8 generally sets 3 ~ 12, preferably 4-8.The section of air admission hole 8
Shape is rectangle, ellipse, circle, trapezoidal or one or more of semicircle etc. combination, preferably rectangular, oval or circle
The combination of one or more of shape.The total sectional area of air admission hole 8 is 0.6 ~ 1.5 times of 2 sectional area of riser, preferably 0.8 ~ 1.2
Times, specific size is determined according to actual operating mode or design requirement by those skilled in the art.
In the demister of the present invention, the air inlet deflector 7 is axially disposed within 8 edge of air admission hole along riser 2, with liter
2 inner wall of tracheae is fixedly connected, the liter gas that two mid point of curve lines are done up and down in 2 outer wall intersection of air admission hole 8 and riser
The angle of the section of 2 outer wall of pipe and 7 plane of air inlet deflector close to 8 one side of air admission hole is γ, and γ is 10 ° ~ 60 °, preferably 20 °
~35°。
In the demister of the present invention, the rotation direction of each air inlet deflector 7 is identical with rectification passage 3, the shape of air inlet deflector 7
Can be rectangle, ellipse, circle, trapezoidal or one or more of semicircle etc. combination, preferably the shape phase with air admission hole 8
Together, 7 area of air inlet deflector is 1.1 ~ 2 times, preferably 1.3 ~ 1.5 times of 8 area of air admission hole.
In the demister of the present invention, lower capping plate 9（2 bottom of riser）Have a certain distance K away from tower tray 1, distance K for 60~
200mm is preferably 80~120mm.
In the demister of the present invention, riser 2 and 1 airtight connection of tower tray, the diameter of riser 2 and the percent opening of tower tray 1
It can be determined according to actual operating mode or design requirement by those skilled in the art.
In the demister of the present invention, the rectification passage 3, upper capping plate 5, lower capping plate 9 can be welded with riser 2
Together or global formation.
In the demister of the present invention, the outer barrel 4 is preferably cylinder, and 4 diameter D of outer barrel is the 1.5- of 2 diameter d of riser
6 times, be preferably 2-3 times.The upper edge of outer barrel 4 be higher by riser 2 on along certain distance P, distance P is 3 height h's of rectification passage
1~8 times, be preferably 2~5 times.The lower edge of outer barrel 4 has certain distance B apart from tower tray 1, and is less than the lower edge of rectification passage 3, outside
Distance B of 4 lower edges of cylinder away from tower tray 1 is 5~100mm, is preferably 20~50mm.The overall height H of outer barrel 4 is 3 height of rectification passage
2.5~10 times, be preferably 3~5 times.The shape of outer barrel 4 can also be one kind in cone cylinder, inversed conical drum or reducing cylinder etc. or
Several combinations.
In the demister of the present invention, the inner surface of the outer barrel 4 sets groove 6 and/or protrusion.Protrusion or groove 6 with
The axis of outer barrel 4 is parallel or can form an angle with axis.The section of the groove 6 or protrusion can also be rectangle,
The suitable shapes such as triangle or circle.
In the demister of the present invention, the inner surface of the outer barrel 4 is preferably provided with the groove of cross sectional shape as shown in Figure 5
6, the section of the groove 6 is made of a circular arc and straight line section；The intersection point of wherein circular arc and 4 inner surface circumference of outer barrel is distinguished
Do the tangent line of circular arc and circumference, the angle between tangent line is α, and α is 5 ° ~ 70 °, is preferably 10 ° ~ 40 °；Circular arc and straightway intersection point
The tangent line for the circular arc that place is done and the angle of straightway are β, and β is 30 ° ~ 110 °, is preferably 45 ° ~ 90 °.The depth Z of groove 6, i.e.,
Circular arc and 0.1 ~ 0.7 times that the beeline on straightway intersection point to 4 inner surface circumference of outer barrel is 4 wall thickness of outer barrel, preferably 0.3
~ 0.5 times；Arc length between the intersection point of the 4 inner surface circumference of intersection point and straightway and outer barrel of 4 inner surface circumference of circular arc and outer barrel is outer
The 1/80 ~ 1/6 of 4 inner surface circumference of cylinder.
In the demister of the present invention, the lower ending opening of the outer barrel 4 can also set toothing or wavy shaped configuration,
It is dripped so as to be more conducive to the liquid isolated from the inner wall of outer barrel 4 into continuous flow.
The junction of each component of demister of the present invention ensures sealing, does not generate gas leak phenomenon.
The demister of the present invention, during work, the gas of entrained drip from the air admission hole 8 of 1 lower end of tower tray in the horizontal direction into
Enter riser 2, gas phase flow direction is changed to tangential direction by radial direction after running into air inlet deflector 7, is conducive to gas along liter
2 inner wall of tracheae, which spirals, to be flowed up, and enhances eddy flow effect.Partial drop collides with air inlet deflector 7 in the process,
Some droplets is made to adhere on air inlet deflector 7 and coalescence, the drop of attachment becomes larger, a part of larger drop its from
The gravity that body generates is more than the climbing power of gas and when making a concerted effort of surface tension of liquid, and drop will be along 7 surface of air inlet deflector
It falls to be separated, that is, completes first time gas-liquid separation；The larger drop of another part then continues to flow with gas,
It is flowed up along 2 inner wall disc spins of riser.When the gas of entrained drip rises in riser 2, gas after capping plate 5 is run into
Phase flow direction changes again, and part droplet is collided with upper capping plate 5, and then completes second of gas-liquid separation；Simultaneously
There is part droplet coalescence to become larger drop again, and continue to flow with gas.The gas edge level of entrained drip or approximate water
Square to rectification passage 3 is entered, since rectification passage 3 has certain length, and 3 total sectional area of rectification passage is less than riser 2
Cross-sectional area, the gas of the more dispersed entrained drip of script directional velocity, after rectification passage 3 is entered, directional velocity is changed to
Along the direction of rectification passage 3, directional velocity comparison rule and concentration, and since circulation area reduces, make the gas of entrained drip
Speed increases after body enters rectification passage 3.When the directional velocity of the gas of entrained drip changes, partial drop and rectification passage 3
Inner wall collides, and is attached on 3 inner wall of rectification passage, and then the gas blowout rectification for constantly being flowed through rectification passage 3 is led to
Road 3 simultaneously falls, and completes third time gas-liquid separation.Meanwhile in rectification passage 3, since the gas velocity direction of entrained drip changes
Become, mutually collision occurs under inertia force effect for part droplet, and droplet aggregation becomes big drop, and the gas of entrained drip
Speed increases when flowing through rectification passage 3, exacerbates the movement of drop, improves the probability that droplet mutually collides, make droplet
Easily aggregation becomes big drop, and with gas with larger speed outflow rectification passage 3.It is flowed out from rectification passage 3
The gas of entrained drip has larger speed, and directional velocity compares concentration, and the drop carried secretly is bigger, continues and outer barrel 4
Inner wall collides, and changes the flow direction of gas again, i.e., the gas of entrained drip along 3 direction of rectification passage by being changed to edge
The circumferencial direction flowing of 4 inner wall of outer barrel.Since the gas velocity of entrained drip is larger, and along the outer barrel 4 for opening up fluted 6
Inner wall rotation flows up, therefore can generate obvious shaving effect.The shaving effect refers to the height of entrained drip
Fast gas along the rotation of 4 inner wall of outer barrel flow up when, drop is constantly thrown toward outer under the action of inertia force, and drop is into recessed
Slot 6 is simultaneously moved along the arc section in groove 6, since angle α is 5 ° ~ 70 °, drop can be made to continue on the arc surface of groove 6
It does and smoothly moves, aggregation is contacted between drop and is become larger, straightway is hindered until running into, and assembles the drop and straightway to become larger
Wall surface is hit strongly, and is attached on the straightway of 4 inboard wall groove 6 of outer barrel, and drop continues to assemble and become larger, and then along outer barrel 4
Inner wall goes downstream；And gas then continues to keep to flow up along the rotation of 4 inner wall of outer barrel at a high speed, realizes gas-liquid point for the 4th time
From, and reduce entrainment.By above-mentioned rectification, acceleration and shaving effect, fluid is made to realize drop in flow process
With the separation of gas.
Embodiment one
Certain wet scrubber tower purifying smoke 150000Nm3/ h, wherein aobvious water concentration is 10~15g/Nm3, after demisting of the present invention
Water concentration is shown in exhaust<0.5g/Nm3, demisting efficiency >=95%.
Embodiment two
Certain wet scrubber tower purifying smoke 100000Nm3/ h, wherein aobvious water concentration is 12~16g/Nm3, after demisting of the present invention
Water concentration is shown in exhaust<0.6g/Nm3, demisting efficiency >=95%.
Claims (12)
1. a kind of high-efficiency multi-stage demister, including several demisting components arranged side by side, it is characterised in that：Each demisting component wraps
Riser and outer barrel are included, outer barrel is arranged on the outside of riser；Riser is fixed on tower tray, and riser bottom is less than tower tray one
Set a distance, the top of riser, which is set, covers plate, and bottom sets lower capping plate；On the circumference of the riser of tower tray above section
Several rectification passages are uniformly arranged, the tangential direction of rectification passage along riser outer wall is horizontal embedded, and rectification passage is close to outer barrel
The side wall I and riser tube wall of one side are tangent, and another side wall II intersects with riser tube wall, each rectification passage direction of rotation phase
Together；Rectification channel roof is flushed with upper capping plate, and bottom is intersected with riser tube wall；Tower tray is with the circumference of the riser of lower part
On be uniformly provided with several air admission holes, air inlet deflector is set on the riser inner wall of air inlet position；The air inlet deflector edge
Riser is axially disposed within air inlet bore edges, is fixedly connected with riser inner wall.
2. demister described in accordance with the claim 1, it is characterised in that：Two up and down in air admission hole and riser outer wall intersection
The section for the riser outer wall that mid point of curve line is done and the angle of the air inlet deflector plane close to air admission hole one side are γ,
γ is 10 ° ~ 60 °.
3. demister described in accordance with the claim 1, it is characterised in that：The rotation direction of air inlet deflector is identical with rectification passage.
4. demister described in accordance with the claim 1, it is characterised in that：Air inlet water conservancy diversion plate suqare is the 1.1 ~ 2 of air inlet hole area
Times.
5. demister described in accordance with the claim 1, it is characterised in that：The rectification passage sets 1 ~ 12；Rectification passage
Length l be side wall II length, maximum horizontal ranges of the width w for rectification passage two side between, height h be rectification passage top
Maximum normal distance between portion and bottom；Wherein length l is 2 ~ 5 times of width w；The cross sectional shape of rectification passage is rectangle, ellipse
One or more of circular, circular, trapezoidal or semicircle combination.
6. demister described in accordance with the claim 1, it is characterised in that：The total sectional area of rectification passage is riser cross-sectional area
0.2 ~ 0.9 times.
7. demister described in accordance with the claim 1, it is characterised in that：The air admission hole sets 3 ~ 12；Air admission hole is cut
Face shape is rectangle, ellipse, circle, trapezoidal or one or more of semicircle combination.
8. demister described in accordance with the claim 1, it is characterised in that：The total sectional area of air admission hole is riser sectional area
0.6 ~ 1.5 times, preferably 0.8 ~ 1.2 times.
9. demister described in accordance with the claim 1, it is characterised in that：Lower capping plate has certain distance K, the distance K to be away from tower tray
60~200mm.
10. demister described in accordance with the claim 1, it is characterised in that：The outer barrel is cylinder, and outer barrel diameter D is liter gas
1.5-6 times of pipe diameter d；The upper edge of outer barrel be higher by riser on along certain distance P, distance P is the 1 of rectification channel height h
~8 times；The lower edge of outer barrel has certain distance B apart from tower tray, and less than the lower edge of rectification passage, distance of the outer barrel lower edge away from tower tray
B is 5~100mm；The overall height H of outer barrel is 2.5~10 times of rectification channel height.
11. demister described in accordance with the claim 1, it is characterised in that：The inner surface of the outer barrel sets groove and/or convex
It rises.
12. demister described in accordance with the claim 1, it is characterised in that：The inner surface of the outer barrel sets the section of groove
It is made of a circular arc and straight line section；The intersection point of wherein circular arc and outer tube inner surface circumference does cutting for circular arc and circumference respectively
Line, the angle between tangent line are α, and α is 5 ° ~ 70 °；Circular arc and the tangent line of circular arc and the folder of straightway done at straightway intersection point
Angle is β, and β is 30 ° ~ 110 °；The depth Z of groove, i.e. circular arc and the beeline on straightway intersection point to outer tube inner surface circumference
For 0.1 ~ 0.7 times of outer barrel wall thickness；The friendship of circular arc and the intersection point and straightway and outer tube inner surface circumference of outer tube inner surface circumference
Arc length between point is the 1/80 ~ 1/6 of outer tube inner surface circumference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990960.6A CN108067050B (en) | 2016-11-11 | 2016-11-11 | High-efficient multistage defroster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990960.6A CN108067050B (en) | 2016-11-11 | 2016-11-11 | High-efficient multistage defroster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108067050A true CN108067050A (en) | 2018-05-25 |
| CN108067050B CN108067050B (en) | 2020-12-08 |
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ID=62154653
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610990960.6A Active CN108067050B (en) | 2016-11-11 | 2016-11-11 | High-efficient multistage defroster |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111298523A (en) * | 2018-12-12 | 2020-06-19 | 中国石油化工股份有限公司 | Cyclone demister |
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| CN2396883Y (en) * | 1999-11-26 | 2000-09-20 | 南京大学 | Conical cyclone gas distributing machine |
| US7001448B1 (en) * | 2001-06-13 | 2006-02-21 | National Tank Company | System employing a vortex finder tube for separating a liquid component from a gas stream |
| US20120168361A1 (en) * | 2010-06-25 | 2012-07-05 | Abbas Motakef | Cyclone induced sweeping flow separator |
| CN102872655A (en) * | 2012-09-21 | 2013-01-16 | 兰州节能环保工程有限责任公司 | Gas-liquid separating device |
| CN203724892U (en) * | 2013-11-05 | 2014-07-23 | 中国石油化工股份有限公司 | Straight cylindrical baffling demister |
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2016
- 2016-11-11 CN CN201610990960.6A patent/CN108067050B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2396883Y (en) * | 1999-11-26 | 2000-09-20 | 南京大学 | Conical cyclone gas distributing machine |
| US7001448B1 (en) * | 2001-06-13 | 2006-02-21 | National Tank Company | System employing a vortex finder tube for separating a liquid component from a gas stream |
| US20120168361A1 (en) * | 2010-06-25 | 2012-07-05 | Abbas Motakef | Cyclone induced sweeping flow separator |
| CN102872655A (en) * | 2012-09-21 | 2013-01-16 | 兰州节能环保工程有限责任公司 | Gas-liquid separating device |
| CN203724892U (en) * | 2013-11-05 | 2014-07-23 | 中国石油化工股份有限公司 | Straight cylindrical baffling demister |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111298523A (en) * | 2018-12-12 | 2020-06-19 | 中国石油化工股份有限公司 | Cyclone demister |
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| CN108067050B (en) | 2020-12-08 |
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