CN108067042A - A kind of cone barrel demister - Google Patents
A kind of cone barrel demister Download PDFInfo
- Publication number
- CN108067042A CN108067042A CN201610990967.8A CN201610990967A CN108067042A CN 108067042 A CN108067042 A CN 108067042A CN 201610990967 A CN201610990967 A CN 201610990967A CN 108067042 A CN108067042 A CN 108067042A
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- China
- Prior art keywords
- riser
- outer barrel
- rectification
- demister
- gas
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Classifications
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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
-
- 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
Abstract
The invention discloses a kind of cone barrel demisters.Demister includes several demisting components arranged side by side, and each demisting component includes riser and outer barrel, and outer barrel is arranged on the outside of riser, preferably with riser on the same axis;Riser is fixed on tower tray, and the top of riser sets capping plate;Several rectification passages are uniformly arranged on the circumference of riser, the tangential direction of rectification passage along riser outer wall is horizontal embedded, 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, and each rectification passage direction of rotation is identical;Rectification channel roof is flushed with capping plate, and bottom is intersected with riser tube wall;Outer barrel diameter is continuously reduced from the bottom to top or stepped reduction, draft tube diameter continuously increase or stepped increase from the bottom to top.The demister of the present invention is simple in structure, less scaling, easy for installation, reduces entrainment, can effectively realize gas-liquid separation.
Description
Technical field
The present invention relates to a kind of gas-liquid separation equipment, especially a kind of cone barrel 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, demisting efficiency is improved, 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.
One kind deflector type of falling shape demister that CN203724890U is introduced is made of several demisting components, each demisting group
Part includes riser and outer barrel, and the circumference of riser is provided with several seams, provided circumferentially about in the riser close to each item seam
There is groove and play the tangential flow guiding wing of guide functions, outer barrel is in an inverted cone.It is real by multiple baffling of the fluid in flow process
The separation of existing drop and gas, can effectively remove the smaller drop of grain size, demisting efficiency is higher.But gas flows through tangential flow guiding
After the wing, gas direction still compares diverging, not enough concentrates, and gas velocity reduces, then impact force is smaller when being collided with outer tube inner wall,
Influence defogging effect.And the demister relies primarily on baffling and changes gas direction, and then gas collides with solid wall surface
It is preferable for larger drop defogging effect so as to fulfill gas-liquid separation, but for droplet effect unobvious, and the demister knot
Structure is more complicated, the easy fouling in the gap between riser and the tangential flow guiding wing.Again since outer barrel is in an inverted cone, flow downward
Gas flow rate improves, and blows drop and hurtles down, easily causes entrainment.
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 is very fast, and liquid phase is easy to separate from gas phase.The technology liquid phase is by 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 cone barrel demisters.The demister structure letter of the present invention
It is single, it is less scaling, it is easy for installation, entrainment is reduced, can effectively realize gas-liquid separation.
The cone barrel demister of the present invention includes several demisting components arranged side by side, and each demisting component includes riser
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, is risen
The top of tracheae sets capping plate;It is uniformly arranged several rectification passages on the circumference of riser, rectification passage is along riser outer wall
Tangential direction it is horizontal embedded, side wall I and riser tube wall of the rectification passage close to outer barrel one side are tangent, another side wall II and liter
Tracheae tube wall intersects, and each rectification passage direction of rotation is identical;Rectification channel roof is flushed with capping plate, bottom and riser tube wall
It is intersecting;Outer barrel diameter is continuously reduced from the bottom to top or stepped reduction, draft tube diameter continuously increase or stepped from the bottom to top
Increase.
The present invention demister in, when outer barrel diameter is continuously reduced from the bottom to top, outer barrel shape be taper, the cone angle of outer barrel
θ is 20 ° -80 °, preferably 30 ° -60 °.
In the demister of the present invention, when draft tube diameter continuously increases from the bottom to top, riser shape is back taper, rises gas
The cone angle φ of pipe is 30 ° -80 °, preferably 45 ° -60 °.
In the demister of the present invention, during outer barrel diameter stepped reduction from the bottom to top, generally it is made of 2 ~ 10 shell rings, it is adjacent
The reduction amplitude of shell ring diameter is 2% ~ 10%, and top diameter is 0.4 ~ 0.9 times of base diameter.
In the demister of the present invention, during draft tube diameter stepped increase from the bottom to top, generally it is made of 2 ~ 10 shell rings, phase
The increase amplitude of adjacent shell ring diameter is 2% ~ 10%, and top diameter is 1.1 ~ 2 times of base diameter.
In the demister of the present invention, capping plate inner wall has certain roughness, and can set groove in capping plate inner wall
Or the structures such as protrusion.
In the demister of the present invention, the area at the top of outer barrel is the 1/3 ~ 2/3 of riser import cross-sectional area.At the top of outer barrel
It is 1~8 times of tangential flow guiding channel height with having certain distance P, P at the top of riser, is preferably 2~5 times.At the top of riser with
On the area of outer cylinder portion arbitrary cross section be less than annulus area where at the top of riser at section(I.e. at the top of riser with
The cross-sectional area in the gap of outer barrel).
In the demister of the present invention, the lower edge of outer barrel has certain distance B apart from tower tray, and is less than the lower edge of rectification passage,
Distance B of the outer barrel lower edge away from tower tray is 5~100mm, is preferably 20~50mm.
In the demister of the present invention, the overall height H of outer barrel is 2.5~10 times of tangential flow guiding channel height, preferably 3~5
Times.
In the demister of the present invention, the conical top of the outer barrel can also connect direct tube section and/or inversed conical drum section;Institute
The height for the direct tube section stated is the 1/20 ~ 1/10 of outer barrel height H;The height of the inversed conical drum section be outer barrel height H 1/10 ~
1/5.The order of connection generally from down to up is following several:(1)Conical section, direct tube section and back taper section;(2)Conical section and straight
Cylinder section;(3)Conical section and back taper section.The diameter of section of each section of guarantee junction of conical section conical section is identical, and weldering may be employed
It connects or global formation.In the demister of the present invention, the rectification passage generally sets 1 ~ 12, preferably 4-8.Rectification passage
Wall thickness it is 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;Side wall I is identical with cone angle φ with the angle of horizontal direction with side wall II.The section shape of rectification passage
Shape is parallelogram, ellipse, circle, trapezoidal or one or more of semicircle etc. combination, be preferably parallelogram,
The combination of one or more of ellipse or circle.The size of rectification passage is according to actual operating mode or design requirement, by ability
Field technique personnel are determined that the height h of such as rectification passage is generally 50~600mm, are preferably 100~300mm;Rectification
The width w of passage is generally 10~200mm, is preferably 20~100mm.The total sectional area of rectification passage is riser cross-sectional area
0.2 ~ 0.9 times, be 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(Close to inner cylinder one end)It can be with riser
It is 0.1 ~ 0.9 times of length l that inner wall, which flushes or extend into un-obstructed draft tube interior certain distance m, m, is preferably 0.3 ~ 0.6 times.When whole
When the side wall II ends of circulation road are flushed with riser inner wall, rectification channel bottom end is also flushed with riser inner wall;When whole
When the side wall II of circulation road extend 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, riser lower end is concordant with tower tray or less than tower tray a distance, the two airtight connection;
The diameter of riser and the percent opening of tower tray can be given really according to actual operating mode or design requirement by those skilled in the art
It is fixed.
The present invention demister in, the rectification passage, capping plate and riser can weld together or integral into
Type.
In the demister of the present invention, the inner surface of the outer barrel sets groove and/or protrusion.Groove or protrusion and outer barrel
Axis it is parallel or can form an angle with axis;Groove or protrusion can be regularly arranged in the distribution of outer tube inner wall
It can be with disordered arrangements;Groove or protrusion can be arranged continuously along outer tube inner wall and can also discontinuously arranged.The groove or protrusion
Section can also be the suitable shapes such as rectangle, triangle or 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 4,
The section of the groove is made of a circular arc and straight line section;The point of intersection of wherein circular arc and outer tube inner surface circumference is done respectively
The tangent line of circular arc and circumference, the angle between tangent line are α, and α is 5 ° ~ 70 °, is preferably 10 ° ~ 40 °;Circular arc and straightway point of intersection
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., it is round
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, 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 outer barrel
The 1/80 ~ 1/6 of inner surface 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 riser, Vapor Entrainment from tower tray lower space
Liquid phase rises, and gas phase flow direction changes after running into capping plate, i.e., is changed to horizontal or level of approximation direction by ascent direction.
Gas enter riser and along riser rise when speed reduced before this as riser section increases, but due to rectification passage
Sectional area be less than riser import sectional area, speed increases sharply after gas enters rectification passage, and more than gas just into
Enter speed during riser, in the process, gas velocity becomes larger gas again from large to small, adds stop of the gas in riser
Time, while the great variety of gas flow rate increase the collision probability for the drop carried secretly in gas, are easier droplet poly-
Larger drop is integrated into, meanwhile, the gas flow resistance of riser is added, so as to improve the efficiency of gas demisting, is reached
Remove the purpose of more droplet.When the directional velocity of the gas of entrained drip changes, partial drop occurs with rectification vias inner walls
Collision, and be attached in rectification vias inner walls, and then constantly flowed through the gas blowout rectification passage of rectification passage and fallen, it is real
Existing gas-liquid separation.In rectification passage, since the gas velocity direction of entrained drip changes, part droplet is acted in inertia force
Lower generation mutually collision, droplet aggregation becomes big drop, and speed increases during the gas stream rectified passage of entrained drip, adds
The acute movement of drop, improves the probability that droplet mutually collides, and droplet can also be made to be easier to assemble and become big drop, and
Rectification passage is flowed out with larger speed with gas.Simultaneously as rectification passage has certain height, and draft tube diameter
Gradually increase from the bottom to top, into the entrained drip of rectification passage gas speed along short transverse there are one smaller speed
Gradient, the size of speed slightly have difference, and local smaller pressure differential is formed when gas being made to be flowed in rectification passage, exacerbates entrainment
The movement of the gas of drop equally makes droplet be easier to assemble as big drop, and flows out rectification passage with gas.This
When, the gas of the entrained drip flowed out from rectification passage has larger speed, and directional velocity compares concentration, and the drop carried secretly
Bigger, continuation collides with outer tube inner wall, again the flow direction of change gas, i.e., the gas of entrained drip is by along whole
Circulation road direction is changed to the circumferencial direction flowing along outer tube inner wall.After the outflow of tangential flow guiding passage, the gas of entrained drip
When flowing to riser with outer barrel gap, since circulation area increases, the gas velocity of entrained drip slightly reduces, entrained drip
Gas residence time increases, and the big drop of the big climbing power to more than gas of self gravitation is separated, and realizes gas-liquid again
Separation.It is flowed up since the gas velocity of entrained drip is larger, and along reeded outer tube inner wall rotation is opened up, therefore meeting
Generate obvious shaving effect.The shaving effect, refer to the high-speed gas of entrained drip along outer tube inner wall rotate to
During upper flowing, drop is constantly thrown toward outer under the action of inertia force, and drop enters groove and transported along the arc section in groove
It is dynamic, since angle α is 5 ° ~ 70 °, the arc surface that drop continues on groove can be made to do smooth movement, contacted between drop poly-
Collection becomes larger, until the straightway for running into groove is hindered, assembles the drop to become larger and is hit strongly with straightway wall surface, and adhere to
On straightway wall surface, drop continues to assemble and become larger, and then goes downstream along outer tube inner wall;And gas then continues along outer barrel
Wall rotation flows up, and realizes gas-liquid separation, and reduces entrainment for the 4th time.Gas continuation is rotated along outer tube inner wall
When flowing up, gas falls portion of energy with the continuous frictional dissipation of outer tube inner wall, gas velocity can be made to decrease, but due to outer
Cylinder has one section of conical section, and circulation area constantly reduces when gas rises, and the gas velocity of rising is made to remain unchanged substantially, still can be with
Stronger shaving effect is maintained, in rectification passage to can effectively realize gas-liquid separation between conical section smallest cross-sectional.Outer barrel
Conical section connection direct tube section and/or inversed conical drum section so that flow velocity reduces when gas flows through this part, and gas is uniformly distributed.
By above-mentioned rectification, acceleration and shaving effect, fluid is made to 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, gas enter riser and along riser rise when speed before this with riser section increase and reduced, gas again into
Speed increases sharply after entering rectification passage, and speed when having just enter into riser more than gas, gas in the process, gas velocity by
Big become smaller becomes larger again, adds residence time of the gas in riser, while the great variety of gas flow rate, increases gas
The collision probability of the drop of middle entrainment makes droplet be easier to assemble and become larger drop, meanwhile, add the gas of riser
Flow resistance so as to improve the efficiency of gas demisting, achievees the purpose that remove more droplet.Rectification passage has certain length
Degree, the gas of the more dispersed entrained drip of script directional velocity, after rectification passage is entered, directional velocity is changed to along rectification
The direction of passage, directional velocity comparison rule and concentration;Rectification passage has certain height, and draft tube diameter from the bottom to top by
It is cumulative big, into the entrained drip of rectification passage gas speed along short transverse there are one smaller velocity gradient, make gas
Body forms local smaller pressure differential when being flowed in rectification passage, exacerbate the movement of the gas of entrained drip.Cylinder inner surface
The section of groove is made of a circular arc and straight line section, and the high-speed gas of entrained drip are flowed up along outer tube inner wall rotation
When, drop is constantly thrown toward outer under the action of inertia force, and drop enters groove and moved along the arc section in groove, due to
Angle α is 5 ° ~ 70 °, and the arc surface that drop continues on groove can be made to do smooth movement, is hindered until running into straightway
It goes downstream along outer tube inner wall after hindering, and exists without dead zone.Since outer barrel has one section of conical section, gas is made to be rotated along outer tube inner wall
Speed remains unchanged substantially when flowing up, and can still maintain stronger shaving effect, is cut in rectification passage to conical section is minimum
Gas-liquid separation can be effectively realized between face.
2nd, the effect of demisting can be effectively achieved, the gas that a large amount of small particle size droplets are carried in processing secretly is particularly suitable for, removes
Mist is efficient, reduces the harm to environment, plays the role of environmental protection.
3rd, it is simple in structure, it is easy to make, it is not easy to plug and fouling, without backwash.
4th, 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 one of which structure diagram of the present invention.
Fig. 2 is the schematic cross-section for the demister that rectification passage is flushed with inner wall.
Fig. 3 is the schematic cross-section for the demister that rectification passage stretches into un-obstructed draft tube interior.
Fig. 4 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;5- covers plate;6- grooves;I- rectification channel side walls
I;II- rectification channel side walls II.
Specific embodiment
The demister of the present invention is described in further detail with reference to the accompanying drawings and examples.
The demister of the present invention includes several demisting components arranged side by side, and each demisting component is including riser 2 and outside
Cylinder 4, outer barrel 4 is arranged on the outside of riser 2, preferably with riser 2 on the same axis;Riser 2 is fixed on tower tray 1,
The top of riser 2 sets capping plate 5;It is uniformly arranged several rectification passages 3 on the circumference of riser 2, rectification passage 3 is along a liter gas
The tangential direction of 2 outer wall of pipe 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 capping plate 5, bottom
Intersect with 2 tube wall of riser in portion;4 diameter of outer barrel is continuously reduced from the bottom to top or stepped reduction, and 2 diameter of riser is from the bottom to top
Continuous increase or stepped increase.
In the demister of the present invention, when 4 diameter of outer barrel is continuously reduced from the bottom to top, 4 shape of outer barrel is taper, outer barrel 4
Taper angle theta is 20 ° -80 °, preferably 30 ° -60 °.
In the demister of the present invention, when 2 diameter of riser continuously increases from the bottom to top, 2 shape of riser is back taper, is risen
The cone angle φ of tracheae 2 is 30 ° -80 °, preferably 45 ° -60 °.
In the demister of the present invention, during outer barrel 4 diameter stepped reduction from the bottom to top, generally it is made of 2 ~ 10 shell rings, phase
The reduction amplitude of adjacent shell ring diameter is 2% ~ 10%, and top diameter is 0.4 ~ 0.9 times of base diameter.
In the demister of the present invention, during riser 2 diameter stepped increase from the bottom to top, generally it is made of 2 ~ 10 shell rings,
The increase amplitude of adjacent cylindrical section diameter is 2% ~ 10%, and top diameter is 1.1 ~ 2 times of base diameter.
In the demister of the present invention, capping 5 inner wall of plate has certain roughness, and can be set in capping 5 inner wall of plate recessed
The structures such as slot or protrusion.
In the demister of the present invention, the area at 4 top of outer barrel is the 1/3 ~ 2/3 of 2 import cross-sectional area of riser.Outer barrel 4
It is 1~8 times of tangential flow guiding channel height that there are certain distance P, P in top with 2 top of riser, is preferably 2~5 times.Riser 2
Annulus area where the area of 4 part arbitrary cross section of outer barrel more than top is less than 2 top of riser at section(Rise gas
The cross-sectional area at 2 top of pipe and the gap of outer barrel 4).
In the demister of the present invention, the lower edge of outer barrel 4 has certain distance B apart from tower tray 1, and less than under rectification passage 3
Edge, distance B of 4 lower edge of outer barrel away from tower tray 1 are 5~100mm, are preferably 20~50mm.
In the demister of the present invention, the overall height H of outer barrel 4 is 2.5~10 times of tangential flow guiding channel height, preferably 3~5
Times.
In the demister of the present invention, the conical top of the outer barrel 4 can also connect direct tube section and/or inversed conical drum section;
The height of the direct tube section is the 1/20 ~ 1/10 of 4 height H of outer barrel;The height of the inversed conical drum section is 4 height H's of outer barrel
1/10~1/5.The order of connection generally from down to up is following several:(1)Conical section, direct tube section and back taper section;(2)Taper
Section and direct tube section;(3)Conical section and back taper section.The diameter of section of each section of conical section conical section guarantee junction is identical, can be with
Using welding or global formation.In the demister of the present invention, the rectification passage 3 generally sets 1 ~ 12, preferably 4-8.
The wall thickness of rectification passage 3 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;Side wall I forms an angle with side wall II with axis, and the angle of the angle and riser 2
It is identical with the angle of axis angle.The cross sectional shape of rectification passage 3 is parallelogram, ellipse, circle, trapezoidal or half
One or more of circle etc. combination is preferably the combination of one or more of parallelogram, ellipse or circle.Rectification
The size of passage 3 is determined, such as the rectification passage 3 according to actual operating mode or design requirement by those skilled in the art
Height h be generally 50~600mm, be preferably 100~300mm;The width w of rectification passage 3 is generally 10~200mm, preferably
For 20~100mm.The total sectional area of rectification passage 3 is 0.2 ~ 0.9 times of 2 cross-sectional area of riser, is preferably that riser 2 is transversal
0.3 ~ 0.6 times of area.
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, 2 lower end of riser is concordant with tower tray 1 or less than 1 a distance of tower tray, the closed company of the two
It connects;The diameter of riser 2 and the percent opening of tower tray 1 can be according to actual operating modes or design requirement, by those skilled in the art
It is determined.
In the demister of the present invention, the rectification passage 3, capping plate 5 can weld together with riser 2 or entirety
Shaping.
In the demister of the present invention, the inner surface of the outer barrel 4 sets groove 6 and/or protrusion.Groove 6 or protrusion with
The axis of outer barrel 4 is parallel or can form an angle with axis;Groove 6 or protrusion can rules in the distribution of 4 inner wall of outer barrel
Arrangement can also disordered arrangements;Groove 6 or protrusion can be arranged continuously along 4 inner wall of outer barrel and can also discontinuously arranged.Described is recessed
The section of slot 6 or protrusion can also be the suitable shapes such as rectangle, 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 4
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 punished
Do not 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 is handed over straightway
The tangent line of circular arc and the angle of straightway that point place is done are β, and β is 30 ° ~ 110 °, are preferably 45 ° ~ 90 °.The depth Z of groove 6,
That is circular arc and the beeline on straightway intersection point to 4 inner surface circumference of outer barrel for 0.1 ~ 0.7 times of 4 wall thickness of outer barrel, are 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,
For the 1/80 ~ 1/6 of 4 inner surface circumference of outer barrel.
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 enters riser 2, gas phase folder from 1 lower space of tower tray
Band liquid phase rises, and gas phase flow direction changes after running into capping plate 5, i.e., is changed to horizontal or level of approximation side by ascent direction
To.Gas enter riser 2 and along riser 2 rise when speed reduced before this as 2 section of riser increases, but due to whole
The sectional area of circulation road 3 is less than the sectional area of 2 import of riser, and speed increases sharply after gas enters rectification passage 3, and is more than
Gas has just enter into speed during riser 2, and in the process, gas velocity becomes larger gas again from large to small, adds gas in a liter gas
Residence time in pipe 2, while the great variety of gas flow rate increase the collision probability for the drop carried secretly in gas, make small
Drop, which is easier to assemble, becomes larger drop, meanwhile, the gas flow resistance of riser 2 is added, is removed so as to improve gas
The efficiency of mist achievees the purpose that remove more droplet.When the directional velocity of the gas of entrained drip changes, partial drop and rectification
3 inner wall of passage collides, and is attached on 3 inner wall of rectification passage, and then the gas blowout for constantly being flowed through rectification passage 3 is whole
Circulation road 3 simultaneously falls, and realizes gas-liquid separation.In rectification passage 3, since the gas velocity direction of entrained drip changes, part
Droplet inertia force effect under occur mutually collision, droplet aggregation become big drop, and the gas of entrained drip flow through it is whole
Speed increases during circulation road 3, exacerbates the movement of drop, improves the probability that droplet mutually collides, also can make droplet more
Easily aggregation becomes big drop, and with gas with larger speed outflow rectification passage 3.Simultaneously as rectification passage 3 has
Certain height, and 2 diameter of riser gradually increases from the bottom to top, into the speed of the gas of the entrained drip of rectification passage 3
Along short transverse there are one smaller velocity gradient, the size of speed slightly has difference, makes gas shape in the interior flowing of rectification passage 3
Into local smaller pressure differential, the movement of the gas of entrained drip is exacerbated, droplet is equally made to be easier to assemble as big drop,
And flow out rectification passage 3 with gas.At this point, the gas from the entrained drip of the outflow of rectification passage 3 has larger speed,
Directional velocity compares concentration, and the drop carried secretly is bigger, and continuation collides with 4 inner wall of outer barrel, changes the stream of gas again
Dynamic direction, the i.e. gas of entrained drip are by being changed to the circumferencial direction flowing along 4 inner wall of outer barrel along 3 direction of rectification passage.From
After the outflow of tangential flow guiding passage, when the gas of entrained drip flow to riser 2 with 4 gap of outer barrel, since circulation area increases, folder
Guttiferous gas velocity slightly reduces, and the gas residence time of entrained drip increases, and self gravitation is greatly to upper more than gas
The big drop of lift is separated, and realizes gas-liquid separation again.Since the gas velocity of entrained drip is larger, and along opening up
Fluted 64 inner wall of outer barrel rotation flows up, therefore can generate obvious shaving effect.The shaving effect is
Refer to entrained drip high-speed gas along 4 inner wall of outer barrel rotation flow up when, drop is constantly thrown toward under the action of inertia force
Outer, drop enter groove 6 and are moved along the arc section in groove 6, since angle α is 5 ° ~ 70 °, drop can be made to continue edge
The arc surface for groove 6 does smooth movement, and contact aggregation becomes larger between drop, until the straightway for running into groove 6 is hindered,
To assemble the drop to become larger to hit strongly with straightway wall surface, and be attached on straightway wall surface, drop continues to assemble and become larger, into
And it goes downstream along 4 inner wall of outer barrel;And gas then continues to flow up along the rotation of 4 inner wall of outer barrel, realizes gas-liquid point for the 4th time
From, and reduce entrainment.Gas continue along 4 inner wall of outer barrel rotation flow up when, gas constantly rubs with 4 inner wall of outer barrel
It wears and consumes portion of energy, gas velocity can be made to decrease, but since outer barrel 4 has one section of conical section, gas circulates when rising
Area constantly reduces, and the gas velocity of rising is made to remain unchanged substantially, stronger shaving effect can be still maintained, in rectification passage
3 to can effectively realize gas-liquid separation between conical section smallest cross-sectional.The conical section connection direct tube section and/or back taper of outer barrel 4
Cylinder section so that flow velocity reduces when gas flows through this part, and gas is uniformly distributed.By above-mentioned rectification, acceleration and shaving effect,
Fluid is made to realize the separation of drop and gas in flow process.
Embodiment 1
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 2
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 (15)
1. a kind of cone barrel demister, including several demisting components arranged side by side, it is characterised in that:Each demisting component includes
Riser 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
On, the top of riser sets capping plate;It is uniformly arranged several rectification passages on the circumference of riser, rectification passage is along riser
The tangential direction of outer wall is horizontal embedded, and side wall I and riser tube wall of the rectification passage close to outer barrel one side are tangent, another side wall II
Intersect with riser tube wall, each rectification passage direction of rotation is identical;Rectification channel roof is flushed with capping plate, bottom and riser
Tube wall intersects;Outer barrel diameter is continuously reduced from the bottom to top or stepped reduction, and draft tube diameter continuously increases from the bottom to top or rank
Scalariform increases.
2. demister described in accordance with the claim 1, it is characterised in that:When outer barrel diameter is continuously reduced from the bottom to top, outer cylindrical
Shape is taper, and the taper angle theta of outer barrel is 20 ° -80 °.
3. demister described in accordance with the claim 1, it is characterised in that:When draft tube diameter continuously increases from the bottom to top, gas is risen
Tube shape is back taper, and the cone angle φ of riser is 30 ° -80 °.
4. demister described in accordance with the claim 1, it is characterised in that:During outer barrel diameter stepped reduction from the bottom to top, by 2 ~
10 shell rings form, and the reduction amplitude of adjacent cylindrical section diameter is 2% ~ 10%, and top diameter is 0.4 ~ 0.9 times of base diameter.
5. demister described in accordance with the claim 1, it is characterised in that:During draft tube diameter stepped increase from the bottom to top, by 2
~ 10 shell rings form, and the increase amplitude of adjacent cylindrical section diameter is 2% ~ 10%, and top diameter is 1.1 ~ 2 times of base diameter.
6. demister described in accordance with the claim 1, it is characterised in that:Area at the top of outer barrel is riser import cross-sectional area
1/3 ~ 2/3;With there is 1~8 times for tangential flow guiding channel height of certain distance P, P at the top of riser at the top of outer barrel;Riser
The area of outer cylinder portion arbitrary cross section more than top is less than the annulus area at section where at the top of riser.
7. demister described in accordance with the claim 1, it is characterised in that:The lower edge of this outer barrel has certain distance B apart from tower tray, and
Less than the lower edge of rectification passage, distance B of the outer barrel lower edge away from tower tray is 5~100mm;The overall height H of outer barrel is led to for tangential flow guiding
2.5~10 times of road height.
8. demister described in accordance with the claim 1, it is characterised in that:The outer barrel conical top connection direct tube section and/
Or inversed conical drum section;The height of the direct tube section is the 1/20 ~ 1/10 of outer barrel height H;The height of the inversed conical drum section is outer
The 1/10 ~ 1/5 of cylinder height H.
9. demister described in accordance with the claim 1, it is characterised in that:The length l of rectification passage be side wall II length, width
Maximum horizontal ranges of the w between rectification passage two side, maximum normal distances of the height h between rectification channel roof and bottom;
Wherein length l is 2 ~ 5 times of width w;The cross sectional shape of rectification passage is parallelogram, ellipse, circle, trapezoidal or semicircle
The combination of one or more of shape is preferably the combination of one or more of parallelogram, ellipse or circle.
10. demister described in accordance with the claim 1, it is characterised in that:The total sectional area of rectification passage is riser cross section
Long-pending 0.2 ~ 0.9 times.
11. demister described in accordance with the claim 1, it is characterised in that:The side wall II ends of the rectification passage are with rising gas
It is 0.1 ~ 0.9 times of length l that inside pipe wall, which flushes or extend into un-obstructed draft tube interior certain distance m, m,;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.
12. demister described in accordance with the claim 1, it is characterised in that:Rectification channel bottom has certain distance A apart from tower tray,
Distance A is 20~200mm.
13. 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.
14. demister described in accordance with the claim 1, it is characterised in that:The inner surface of the outer barrel sets groove, the groove
Section be made of a circular arc and straight line section;The point of intersection of wherein circular arc and outer tube inner surface circumference do respectively circular arc and
The tangent line of circumference, the angle between tangent line are α, and α is 5 ° ~ 70 °;The tangent line of the circular arc done at circular arc and straightway intersection point with it is straight
The angle of line segment is β, and β is 30 ° ~ 110 °;On the depth Z of groove, i.e. circular arc and straightway intersection point to outer tube inner surface circumference
Beeline, for 0.1 ~ 0.7 times of outer barrel wall thickness;Circular arc and the intersection point and straightway of outer tube inner surface circumference and outer tube inner surface
Arc length between the intersection point of circumference is the 1/80 ~ 1/6 of outer tube inner surface circumference.
15. the demister described in a kind of claim 1 ~ 14 any claim is in the absorption tower using wet desulfurizing process
Using, it is characterised in that:The gas velocity of rectification channel outlet is into 1.5 ~ 3 times of gas velocity of riser.
Priority Applications (1)
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CN201610990967.8A CN108067042A (en) | 2016-11-11 | 2016-11-11 | A kind of cone barrel demister |
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CN201610990967.8A CN108067042A (en) | 2016-11-11 | 2016-11-11 | A kind of cone barrel demister |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2016
- 2016-11-11 CN CN201610990967.8A patent/CN108067042A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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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Application publication date: 20180525 |