CN108067048A - A kind of bipyramid tubular demister - Google Patents
A kind of bipyramid tubular demister Download PDFInfo
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- CN108067048A CN108067048A CN201610990977.1A CN201610990977A CN108067048A CN 108067048 A CN108067048 A CN 108067048A CN 201610990977 A CN201610990977 A CN 201610990977A CN 108067048 A CN108067048 A CN 108067048A
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- riser
- outer barrel
- rectification
- wall
- demister
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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
- B01D45/04—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
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
The invention discloses a kind of bipyramid tubular 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；The diameter of outer barrel and riser is continuously reduced from the bottom to top or stepped reduction.The demister of the present invention is simple in structure, and pressure drop is small, 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 bipyramid tubular 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 bipyramid tubular demisters.The demister structure of the present invention
Simply, pressure drop is small, less scaling, easy for installation, reduces entrainment, can effectively realize gas-liquid separation.
The bipyramid tubular 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,
The top of riser sets capping plate；It is uniformly arranged several rectification passages on the circumference of riser, rectification passage is along outside riser
The tangential direction of 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 and
Riser tube wall intersects, and each rectification passage direction of rotation is identical；Rectification channel roof is flushed with capping plate, bottom and riser pipe
Wall intersects；Outer barrel diameter is continuously reduced from the bottom to top or stepped reduction, and draft tube diameter is continuously reduced from down to up or ladder
Shape reduces.
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 °.
The present invention demister in, when draft tube diameter is continuously reduced from the bottom to top, riser shape be taper, riser
Cone angle φ be 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 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 0.5 ~ 0.9 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 0.2 ~ 0.8 times of riser import cross-sectional area.Outer barrel top
Portion 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
The area of above outer cylinder portion arbitrary cross section is less than the annulus area at section where at the top of riser（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.The cross sectional shape of rectification passage is parallelogram, ellipse, circle, it is trapezoidal or semicircle etc. in
One or more combination, be preferably the combination of one or more of parallelogram, ellipse or circle.The ruler of rectification passage
Very little operating mode or design requirement according to reality is determined by those skilled in the art, as the height h of the rectification passage
It is preferably 100~300mm for 50~600mm；The width w of rectification passage is generally 10~200mm, is preferably 20~100mm.
The total sectional area of rectification passage is 0.2 ~ 0.9 times of riser cross-sectional area, is preferably the 0.3 ~ 0.6 of riser cross-sectional area
Times.
In the demister of the present invention, the outer end of the side wall I and side wall II of the rectification passage（One end away from inner cylinder,
Similarly hereinafter）Not concordant, outer end of the outer end than side wall I of side wall II grows a distance a, distance a be rectification channel width w 0.2 ~
0.8 times, be preferably 0.3 ~ 0.6 times.
In the demister of the present invention, the side wall II ends of the rectification passage（One end of close inner cylinder, similarly hereinafter）It can be with
It is 0.1 ~ 0.9 times of length l to flush or extend into un-obstructed draft tube interior certain distance m, m with riser inner wall, is preferably 0.3 ~ 0.6
Times.When the side wall II ends of rectification passage are flushed with riser inner wall, rectification channel bottom end is also neat with riser inner wall
It is flat；When the side wall II of rectification passage extend into un-obstructed draft tube interior certain distance m, rectification channel bottom end and side wall end are neat
It is flat.
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 since draft tube diameter is gradually reduced from the bottom to top, gas flow area reduces, and speed is continuously increased, adds
Contact probability in gas phase between drop, the mutual Collision coagulation of more droplets is into larger in flow process from bottom to top
Drop, gas phase flow direction changes after running into capping plate, i.e., is changed to horizontal or level of approximation direction, aggregation by ascent direction
The larger drop and part droplet formed is attached on capping plate, attachment since effect of inertia and capping plate collide
Drop become larger, when drop arrive greatly its own generation gravity be more than gas climbing power and surface tension of liquid make a concerted effort
When, drop is just separated from capping plate surface, completes first time gas-liquid separation.The gas of entrained drip along horizontal or
Level of approximation direction enters rectification passage, and since rectification passage has certain length, and rectification passage total sectional area is less than liter gas
Pipe cross-sectional area, the gas of the more dispersed entrained drip of script directional velocity, 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, make the gas of entrained drip
Speed increases after into rectification passage.When the directional velocity of the gas of entrained drip changes, partial drop and rectification vias inner walls
Collide, and be attached in rectification vias inner walls, so constantly flowed through rectification passage gas blowout rectification passage and under
Fall, complete second of gas-liquid separation.Meanwhile in rectification passage, since the gas velocity direction of entrained drip changes, part is small
Mutually collision occurs under inertia force effect for drop, and droplet aggregation becomes big drop, and the gas stream of entrained drip is rectified
Speed increases during passage, exacerbates the movement of drop, improves the probability that droplet mutually collides, can also be easier droplet
Aggregation becomes big drop, and flows out rectification passage with gas with larger speed；Since rectification passage has certain height,
And draft tube diameter is gradually reduced from the bottom to top, the speed into the gas of the entrained drip of rectification passage has one along short transverse
A smaller velocity gradient, the size of speed slightly have difference, and local smaller pressure is formed when gas being made to be flowed in rectification passage
Difference, exacerbates the movement of the gas of entrained drip, and droplet is equally made to be easier to assemble as big drop, and is flowed with gas
Go out rectification passage.Again since riser and outer barrel are taper, the angle and riser and axis of rectification channel side wall and axis
Angle it is identical, and outer end of the outer end of side wall II than side wall I grows a distance, and outer tube inner wall is made to be cut with rectification channel outlet
The distance between each point is essentially identical on face, gas flowed out everywhere from rectification channel outlet section after almost simultaneously and outer tube inner wall
It hits and changes direction again, Flow Field Distribution is than more uniform and regular relatively strong.At this point, the gas of entrained drip is with larger
Speed, directional velocity compares concentration, and the drop carried secretly is bigger, and continuation collides with outer tube inner wall, changes gas again
Flow direction, i.e., the gas of entrained drip by along rectification channel direction be changed to along outer tube inner wall circumferencial direction flowing.
Meanwhile after the outflow of tangential flow guiding passage, when the gas of entrained drip flow to riser with outer barrel gap, since circulation area increases
Add, the gas velocity of entrained drip slightly reduces, and the gas residence time of entrained drip increases, and it is more than gas that self gravitation, which arrives greatly,
The big drop of climbing power separated, complete third time gas-liquid separation.Since the gas velocity of entrained drip is larger, and
It is flowed up along reeded outer tube inner wall rotation is opened up, therefore obvious shaving effect can be generated.The shaving
Effect, refer to the high-speed gas of entrained drip along outer tube inner wall rotation flow up when, drop under the action of inertia force constantly
Be thrown toward outer, drop enters groove and is moved along the arc section in groove, due to angle α be 5 ° ~ 70 °, can make drop after
The continuous arc surface along groove does smooth movement, and contacting aggregation between drop becomes larger, until the straightway for running into groove is hindered
Hinder, assemble the drop to become larger and hit strongly with straightway wall surface, and be attached on straightway wall surface, drop continues to assemble and become
Greatly, and then along outer tube inner wall go downstream；And gas then continues to flow up along outer tube inner wall rotation, realizes gas-liquid the 4th time
Separation, and reduce entrainment.Gas continue along outer tube inner wall rotation flow up when, gas constantly rubs with outer tube inner wall
It wears and consumes portion of energy, gas velocity can be made to decrease, but since outer barrel has one section of conical section, circulating face when gas rises
Product constantly reduces, and the gas velocity of rising is made to remain unchanged substantially, can still maintain stronger shaving effect, in rectification passage extremely
Gas-liquid separation can be effectively realized between conical section smallest cross-sectional.The conical section connection direct tube section and/or inversed conical drum section of outer barrel,
So that flow velocity reduces when gas flows through this part, gas is uniformly distributed.By above-mentioned rectification, acceleration and shaving effect, make stream
Body realizes 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, rectification passage has certain length, and the gas of the more dispersed entrained drip of script directional velocity leads into rectification
Behind road, directional velocity is changed to along the direction of rectification passage, directional velocity comparison rule and concentration；Rectification passage has certain height
Degree, and draft tube diameter is gradually reduced from the bottom to top, into the entrained drip of rectification passage gas speed along short transverse
There are one smaller velocity gradients, and local smaller pressure differential is formed when gas being made to be flowed in rectification passage, exacerbates entrainment liquid
The movement of the gas of drop；Outer tube inner wall and the distance between each point on rectification channel outlet section are essentially identical, and gas is from rectification
Channel outlet section after flowing out everywhere almost hits with outer tube inner wall and changes direction again simultaneously, Flow Field Distribution than more uniform and
Regularity is stronger.And rectification passage total sectional area is less than riser cross-sectional area, since circulation area reduces, makes entrained drip
Speed increases after gas enters rectification passage.The section of cylinder inner surface groove is made of a circular arc and straight line section, folder
Guttiferous high-speed gas along outer tube inner wall rotation flow up when, drop is constantly thrown toward outer under the action of inertia force,
Drop enters groove and is moved along the arc section in groove, since angle α is 5 ° ~ 70 °, drop can be made to continue on groove
Arc surface does smooth movement, until run into straightway it is hindered after go downstream along outer tube inner wall, and without dead zone exist.By
There is one section of conical section in outer barrel, gas is made to rotate speed when flowing up along outer tube inner wall and is remained unchanged substantially, can still be maintained
Stronger shaving effect, in rectification passage to can effectively realize gas-liquid separation between conical section smallest cross-sectional.
2nd, the effect of demisting can be effectively achieved, effectively removes the smaller drop of grain size carried secretly in gas, demisting effect
Rate is high, reduces the harm to environment, plays the role of environmental protection.
3rd, gas flow uniform, flow resistance is small, and resistance reduces.
4th, it is simple in structure, it is easy to make, it is not easy to plug and fouling, without backwash.
5th, 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；Outer barrel 4 is continuously reduced from the bottom to top with 2 diameter of riser or stepped reduction.
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 is continuously reduced from the bottom to top, 2 shape of riser is taper, rises gas
The cone angle φ of pipe 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 reduction from the bottom to top, generally it is made of 2 ~ 10 shell rings,
The reduction amplitude of adjacent cylindrical section diameter is 2% ~ 10%, and top diameter is 0.5 ~ 0.9 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 0.2 ~ 0.8 times of 2 import cross-sectional area of riser.Outer barrel
It is 1~8 times of tangential flow guiding channel height that there are certain distance P, P in 4 tops with 2 top of riser, is preferably 2~5 times.Riser
Annulus area where the area of 4 part arbitrary cross sections of outer barrel more than 2 tops is less than 2 top of riser at section（Rise
The cross-sectional area at 2 top of tracheae 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 is identical with cone angle φ with the angle of horizontal direction with side wall II.Rectification passage 3 is cut
Face shape is parallelogram, ellipse, circle, trapezoidal or one or more of semicircle etc. combination, be preferably parallel four
The combination of one or more of side shape, ellipse or circle.The size of rectification passage 3 according to actual operating mode or design requirement,
It being determined by those skilled in the art, the height h of such as rectification passage 3 is generally 50~600mm, preferably 100~
300mm；The width w of rectification passage 3 is generally 10~200mm, is preferably 20~100mm.The total sectional area of rectification passage 3 is liter
0.3 ~ 0.6 times of 0.2 ~ 0.9 times of 2 cross-sectional area of tracheae, preferably 2 cross-sectional area of riser.
In the demister of the present invention, the side wall I of the rectification passage 3 and the outer end of side wall II be not concordant, side wall II's
Outer end of the outer end than side wall I grows a distance a, and distance a is 0.2 ~ 0.8 times of 3 width w of rectification passage, is preferably 0.3 ~ 0.6
Times.
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 since 2 diameter of riser is gradually reduced from the bottom to top, gas flow area reduces, and speed is continuously increased, and increases
Contact probability in gas phase between drop, in flow process from bottom to top more droplets mutual Collision coagulations into compared with
Big drop, gas phase flow direction changes after running into capping plate 5, i.e., is changed to horizontal or level of approximation direction by ascent direction,
Assemble the larger drop formed and part droplet since effect of inertia and capping plate 5 collide, and be attached to capping plate 5
On, the drop of attachment becomes larger, when the gravity that drop arrives greatly its own generation is more than the climbing power of gas and liquid surface
When making a concerted effort of power, drop are just separated from 5 surface of capping plate, complete first time gas-liquid separation.The gas of entrained drip
Body enters rectification passage 3 along horizontal or level of approximation direction, and since rectification passage 3 has certain length, and rectification passage 3 is always cut
Area is less than 2 cross-sectional area of riser, and the gas of the more dispersed entrained drip of script directional velocity is entering rectification passage 3
Afterwards, directional velocity is changed to along the direction of rectification passage 3, directional velocity comparison rule and concentration, and since circulation area reduces,
The gas of entrained drip is made to enter speed increase after rectification passage 3.When the directional velocity of the gas of entrained drip changes, part liquid
Drop collides with 3 inner wall of rectification passage, and is attached on 3 inner wall of rectification passage, and then is constantly flowed through the gas of rectification passage 3
Body blowout rectification passage 3 simultaneously falls, and completes second of gas-liquid separation.Meanwhile in rectification passage 3, due to the gas of entrained drip
Body directional velocity changes, and mutually collision occurs under inertia force effect for part droplet, and droplet aggregation becomes big drop, and presss from both sides
Speed increases during guttiferous gas stream rectified passage 3, exacerbates the movement of drop, improve droplet mutually collide it is several
Rate can also make droplet be easier to assemble as big drop, and with gas with larger speed outflow rectification passage 3；By
There is certain height in rectification passage 3, and 2 diameter of riser is gradually reduced from the bottom to top, into the entrained drip of rectification passage 3
Gas speed along short transverse there are one smaller velocity gradient, the size of speed slightly has difference, gas is made to lead in rectification
Local smaller pressure differential is formed in road 3 during flowing, exacerbates the movement of the gas of entrained drip, is equally easier droplet poly-
Big drop is integrated into, and rectification passage 3 is flowed out with gas.Again since riser 2 and outer barrel 4 are taper, rectification passage 3
Side wall is identical with the angle of axis with the angle and riser 2 of axis, and outer end of the outer end of side wall II than side wall I grows one section
Distance, makes that 4 inner wall of outer barrel and the distance between each point on 3 outlet of rectification passage are essentially identical, and gas goes out from rectification passage 3
Mouth section after flowing out everywhere almost hits with 4 inner wall of outer barrel and changes direction again simultaneously, and Flow Field Distribution is than more uniform and rule
Property is stronger.At this point, the gas of entrained drip has larger speed, directional velocity compares concentration, and the drop carried secretly is bigger,
Continuation collides with 4 inner wall of outer barrel, again the flow direction of change gas, i.e., the gas of entrained drip is by along rectification passage
3 directions are changed to the circumferencial direction flowing along 4 inner wall of outer barrel.Meanwhile after the outflow of tangential flow guiding passage, the gas of entrained drip
When flowing to riser 2 with 4 gap of outer barrel, since circulation area increases, the gas velocity of entrained drip slightly reduces, entrained drip
Gas residence time increase, self gravitation to being more than that the big drop of climbing power of gas is separated, completes the 3rd greatly
Secondary gas-liquid separation.It is rotated since the gas velocity of entrained drip is larger, and along 4 inner wall of outer barrel for opening up fluted 6 to upstream
It is dynamic, therefore obvious shaving effect can be generated.The shaving effect refers to the high-speed gas of entrained drip along outer barrel 4
Inner wall rotation is when flowing up, and drop is constantly thrown toward outer under the action of inertia force, and drop enters groove 6 and along groove 6
Interior arc section movement, since angle α is 5 ° ~ 70 °, can make the arc surface that drop continues on groove 6 do smooth movement,
Contact aggregation becomes larger between drop, until the straightway for running into groove 6 is hindered, assembles the drop to become larger and straightway wall surface is strong
Strong shock, and be attached on straightway wall surface, drop continues to assemble and become larger, and then goes downstream along 4 inner wall of outer barrel；And gas
Then continue to flow up along the rotation of 4 inner wall of outer barrel, realize gas-liquid separation, and reduce entrainment for the 4th time.Gas after
It is continuous along the rotation of 4 inner wall of outer barrel flow up when, gas falls portion of energy with the continuous frictional dissipation of 4 inner wall of outer barrel, and gas can be made fast
Degree decreases, but since outer barrel 4 has one section of conical section, circulation area constantly reduces when gas rises, and makes the gas speed of rising
Degree remains unchanged substantially, can still maintain stronger shaving effect, in rectification passage 3 to can have between conical section smallest cross-sectional
Realize gas-liquid separation in effect ground.The conical section connection direct tube section and/or inversed conical drum section of outer barrel 4 so that when gas flows through this part
Flow velocity reduces, and gas is uniformly distributed.By above-mentioned rectification, acceleration and shaving effect, fluid is made to realize drop in flow process
With the separation of gas.
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 (18)
1. a kind of bipyramid tubular 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 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, 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 by down toward
On be continuously reduced or stepped reduction, draft tube diameter is continuously reduced from down to up or stepped reduction.
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 is continuously reduced from the bottom to top, gas is risen
Tube shape is 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 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 0.5 ~ 0.9 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
0.2 ~ 0.8 times.
7. demister described in accordance with the claim 1, it is characterised in that：With having certain distance P, P at the top of riser at the top of outer barrel
For 1~8 times of tangential flow guiding channel height；The area of outer cylinder portion arbitrary cross section more than at the top of riser is less than riser
Annulus area where top at section.
8. demister described in accordance with the claim 1, it is characterised in that：The lower edge of outer barrel has certain distance B apart from tower tray, and low
In the lower edge of rectification passage, distance B of the outer barrel lower edge away from tower tray is 5~100mm.
9. demister described in accordance with the claim 1, it is characterised in that：The overall height H of outer barrel is tangential flow guiding channel height
2.5~10 times.
10. 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.
11. demister described in accordance with the claim 1, it is characterised in that：The rectification passage sets 1 ~ 12.
12. demister described in accordance with the claim 1, it is characterised in that：The length l of rectification passage is the length of side wall II, wide
Spend maximum horizontal ranges of the w between rectification passage two side, maximum perpendiculars of the height h between rectification channel roof and bottom away from
From；Wherein length l is 2 ~ 5 times of width w；The cross sectional shape of rectification passage for parallelogram, ellipse, circle, it is trapezoidal or
The combination of one or more of semicircle.
13. 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.
14. demister described in accordance with the claim 1, it is characterised in that：Compare side in the outer end of the side wall II of the rectification passage
The outer end of wall I grows a distance a, and distance a is 0.2 ~ 0.8 times of rectification channel width w.
15. demister described in accordance with the claim 1, it is characterised in that：The side wall II ends of the rectification passage can be with
It is 0.1 ~ 0.9 times of length l that riser inner wall, which flushes or extend into un-obstructed draft tube interior certain distance m, m,；When the side of rectification passage
When wall II ends are flushed with riser inner wall, rectification channel bottom end is also flushed with riser inner wall；When the side of rectification passage
When wall II extend into un-obstructed draft tube interior certain distance m, rectification channel bottom end is flushed with side wall end.
16. 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.
17. according to the demister described in claim 1 or 16, it is characterised in that：The inner surface of the outer barrel sets groove, should
The section of 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 does circle respectively
The tangent line of arc and circumference, the angle between tangent line are α, and α is 5 ° ~ 70 °；Circular arc and the tangent line of the circular arc done at straightway intersection point
Angle with straightway is β, and β is 30 ° ~ 110 °；The depth Z of groove, i.e. circular arc and straightway intersection point to outer tube inner surface circumference
On beeline, be 0.1 ~ 0.7 times of outer barrel wall thickness；In the intersection point and straightway and outer barrel of circular arc and outer tube inner surface circumference
Arc length between the intersection point of surface perimeter is the 1/80 ~ 1/6 of outer tube inner surface circumference.
18. a kind of right wants the bipyramid tubular demister described in 1 ~ 16 any claim of ball in the suction using wet desulfurizing process
Receive the application in tower, 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)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990977.1A CN108067048B (en) | 2016-11-11 | 2016-11-11 | Double-cone cylindrical demister |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990977.1A CN108067048B (en) | 2016-11-11 | 2016-11-11 | Double-cone cylindrical demister |
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| CN108067048B CN108067048B (en) | 2020-09-11 |
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| CN108067048B (en) | 2020-09-11 |
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