CN107803068A - A kind of high efficiency demister - Google Patents
A kind of high efficiency demister Download PDFInfo
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- CN107803068A CN107803068A CN201610810054.3A CN201610810054A CN107803068A CN 107803068 A CN107803068 A CN 107803068A CN 201610810054 A CN201610810054 A CN 201610810054A CN 107803068 A CN107803068 A CN 107803068A
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- Prior art keywords
- riser
- outer barrel
- demister
- section
- rectification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—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
- B01D45/04—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a kind of high efficiency demister.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；Some rectification passages are uniformly arranged on the circumference of riser, tangential direction of the rectification passage along riser outer wall is horizontal embedded, side wall I and riser tube wall of the rectification passage close to outer barrel 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.The demister of the present invention is simple in construction, 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 high efficiency demister.
Background technology
Substantial amounts of SO is produced in the production process of the industries such as electric power, metallurgy, petrochemical industry2With the harmful substance such as dust, bring
Serious acid rain harm and haze weather, it is the atmosphere pollution of the current priority control in China.At present, field of Environment Protection generally uses
Wet desulfurizing process is made a return journey except harmful substances such as the sulfur dioxide in flue gas, i.e., sprays alkali lye to flue gas so as to absorb or adsorb this
A little harmful substances.With a large amount of particle diameters 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 and caused by resistance drop increase to predetermined value when, it is necessary to start anti-
Cleaning procedure is rinsed to demister, typically, is both needed to set flooding nozzle in demister inlet end and exhaust end, now may
Cause serious entrainment of the gas phase to liquid phase, cause gas phase band liquid.
Conventional demister has mesh mist eliminator, collapser demister, rotational flow plate defroster etc..Although mesh mist eliminator energy
In general mist is separated, but requires that mist cleaning, air-flow velocity are smaller, and resistance drop is big, service life is short, and equipment investment is big.
Demister typically 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, is drifted in gas, it is impossible to silk screen making contact and be removed, and because be separated drop and gas phase are 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
Easily block, the problems such as 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, increase defogging effect, structure is more complicated, and separating effect is bad.Rotational flow plate defroster is separated 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 up of deflection plate and flue gas flow field adjustment block, and deflection plate is fixed
In flue gas flow field adjustment block, the density and shape of deflection plate change according to the flow area change of flow field parameter everywhere, from
And the flow area of air-flow in absorption tower is 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 up of cooler, coarse defogging device and smart demister etc., coarse defogging
Device is corrugated sheet or demisting plate, and smart demister is steel wire, and it is inverse that the demister changes traditional demister drop and airflow direction
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 up of several demisting components, each demisting group
Part includes riser and outer barrel, and the circumference of riser is provided with some seams, provided circumferentially about in the riser close to each bar 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 less drop of particle diameter, 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 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 realize gas-liquid separation, but for droplet DeGrain, and the demister knot
Structure is more complicated, the easy fouling in the space between riser and the tangential flow guiding wing.Again because 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, flat board 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 during, it is possible to achieve gas liquid cross-flow, therefore reentrainment effect of the gas phase to drop substantially reduces, 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 shortcomings of the prior art, the invention provides a kind of high efficiency demister, by fluid in flow process
The separation of drop and gas is realized in baffling, rectified action and high speed rotation shaving flowing.The demister of the present invention is simple in construction, pressure
Drop it is small, it is less scaling, it is easy for installation, reduce entrainment, can effectively realize gas-liquid separation.
The demister of the present invention includes several demisting components arranged side by side, and each demisting component is including riser and outside
Cylinder, outer barrel are arranged on the outside of riser, preferably with riser on the same axis；Riser is fixed on tower tray, riser
Top set capping plate；Some rectification passages are uniformly arranged on the circumference of riser, rectification passage is cut along riser outer wall
Line direction is horizontal embedded, and side wall I and riser tube wall of the rectification passage close to outer barrel side are tangent, another side wall II and riser
Tube wall intersects, and each rectification passage direction of rotation is identical；Rectification channel roof flushes with capping plate, bottom and riser tube wall phase
Hand over；Outer barrel diameter is continuously reduced from the bottom to top or stepped reduction.
In the demister of the present invention, when outer barrel diameter is continuously reduced from the bottom to top, outer barrel is shaped as taper, the cone angle of outer barrel
θ is 20 ° -80 °, preferably 30 ° -60 °.
In the demister of the present invention, during outer barrel diameter stepped reduction from the bottom to top, typically it is made up of 1 ~ 10 shell ring, 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, the area at the top of outer barrel is the 1/3 ~ 2/3 of riser cross-sectional area.With rising at the top of outer barrel
It is 1~8 times, preferably 2~5 times of tangential flow guiding channel height to have certain distance P, P at the top of tracheae.More than at the top of riser
The area of outer cylinder portion arbitrary cross section is less than the annulus area at section where at the top of riser（That is riser top and outer barrel
Gap cross-sectional area）.
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, 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 described 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 described inversed conical drum section be outer barrel height H 1/10 ~
1/5.The order of connection typically 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, can use weldering
Connect or global formation.In the demister of the present invention, described rectification passage typically 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 side wall II length, 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, preferably 3 ~ 4 times；The cross sectional shape of rectification passage be rectangle, ellipse, circle, it is trapezoidal or semicircle etc. in one kind
Or several combinations, the one or more combination in preferably rectangular, oval or circle.The size of rectification passage is according to reality
Operating mode or design requirement, are determined by those skilled in the art, and the height h of such as described rectification passage is generally 20~600mm,
Preferably 100~300mm；The width w of rectification passage is generally 10~200mm, preferably 20~100mm.Rectification passage it is total
Sectional area is 0.2 ~ 0.9 times of riser cross-sectional area, preferably the 0.3 ~ 0.6 of riser cross-sectional area times.
In the demister of the present invention, the side wall II ends of described rectification passage can flush or stretch into riser inwall
To un-obstructed draft tube interior certain distance m, m is 0.1 ~ 0.9 times, preferably 0.3 ~ 0.6 times of length l.As the side wall II of rectification passage
When end flushes with riser inwall, rectification channel bottom end also flushes with riser inwall；As the side wall II of rectification passage
When extending into un-obstructed draft tube interior certain distance m, rectification channel bottom end flushes 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 the segment distance of tower tray one, the two airtight connection；
The diameter of riser and the percent opening of tower tray can be given really according to the operating mode or design requirement of reality by those skilled in the art
It is fixed.
The present invention demister in, described rectification passage, capping plate and riser can weld together or integral into
Type.
In the demister of the present invention, the inner surface setting groove and/or projection of described outer barrel.Groove or projection and outer barrel
Diameter parallel, or can be formed an angle with axis；Groove or the raised distribution in outer tube inner wall can be with regularly arranged
Can be with disordered arrangements；Groove or projection can continuously be arranged along outer tube inner wall and can also discontinuously arranged.Described groove or projection
Section can also be the suitable shape such as rectangle, triangle or circle.
In the demister of the present invention, the inner surface of described outer barrel is preferably provided with the groove of cross sectional shape as shown in Figure 4,
The section of the groove is made up 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 °, 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 °, preferably 45 ° ~ 90 °.The depth Z of groove, i.e., it is round
Beeline on arc and straightway intersection point to outer tube inner surface circumference, is 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, it is outer barrel
The 1/80 ~ 1/6 of inner surface circumference.
In the demister of the present invention, the lower ending opening of described outer barrel can also set toothing or wavy shaped configuration,
So as to advantageously be dripped in the liquid isolated from the inwall of outer barrel into continuous stream.
The junction of each component of demister of the present invention ensures sealing, does not produce 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,
And part droplet due to effect of inertia with capping plate collide, and be attached to capping plate on, the drop of attachment becomes larger,
When drop arrives greatly climbing power of its own the caused gravity more than gas and when making a concerted effort of surface tension of liquid, drop is just from capping
It is separated in plate surface, completes first time gas-liquid separation.The gas of entrained drip enters along horizontal or level of approximation direction
Enter rectification passage, because rectification passage has certain length, and rectification passage total sectional area is less than riser cross-sectional area, originally
The gas of the more dispersed entrained drip of velocity attitude, after rectification passage is entered, velocity attitude is changed to along rectification passage
Direction, velocity attitude comparison rule and concentration, and because circulation area reduces, after the gas of entrained drip is entered rectification passage
Speed increase.When the velocity attitude of the gas of entrained drip changes, partial drop collides with rectification vias inner walls, and adheres to
In rectification vias inner walls, and then constantly flowed through the gas blowout rectification passage of rectification passage and fallen, complete second of gas
Liquid separates.Meanwhile in rectification passage, because the gas velocity direction of entrained drip changes, part droplet is in inertia masterpiece
With lower generation mutually collision, droplet aggregation turns into big drop, and speed increases during the gas stream rectified passage of entrained drip,
The motion of drop is exacerbated, improves the probability that droplet mutually collides, droplet is easier aggregation turns into big drop,
And rectification passage is flowed out with larger speed with gas.After the outflow of tangential flow guiding passage, the gas of entrained drip is flow to
When riser is with outer barrel gap, due to circulation area increase, the gas velocity of entrained drip slightly reduces, the gas of entrained drip
Residence time increases, and the big drop of the big climbing power to more than gas of self gravitation is separated, and completes third time gas-liquid
Separation.Now, the gas of entrained drip has larger speed, and velocity attitude compares concentration, and the drop carried secretly is bigger, after
Continuous to be collided with outer tube inner wall, the flow direction of change gas again, the i.e. gas of entrained drip are by along rectification passage side
To the circumferencial direction flowing being changed to along outer tube inner wall.Because the gas velocity of entrained drip is larger and fluted along opening up
Outer tube inner wall rotation flow up, therefore obvious shaving effect can be produced.Described shaving effect, refer to carry liquid secretly
The high-speed gas of drop along outer tube inner wall rotation flow up when, drop is constantly thrown toward outer, drop in the presence of inertia force
Moved into groove and along the arc section in groove, because angle α is 5 ° ~ 70 °, drop can be made to continue on the circular arc of groove
Smooth motion is done in face, and contact aggregation change is big between drop, until the straightway for running into groove is hindered, aggregation becomes big drop
Hit, and be attached on straightway wall strongly with straightway wall, drop continues to assemble and becomes big, and then suitable along outer tube inner wall
Stream and under；And gas then continues to flow up along outer tube inner wall rotation, gas-liquid separation is realized, and reduces mist for the 4th time
Entrainment.Gas continue along outer tube inner wall rotation flow up when, portion of energy, meeting are fallen in gas and the continuous frictional dissipation of outer tube inner wall
Gas velocity is set to decrease, but because outer barrel has one section of conical section, circulation area constantly reduces when gas rises, and makes rising
Gas velocity remains unchanged substantially, can still maintain stronger shaving effect, in rectification passage between conical section smallest cross-sectional
Gas-liquid separation can be effectively realized.The conical section connection direct tube section and/or inversed conical drum section of outer barrel so that gas flows through this portion
Timesharing flow velocity is reduced, and gas is uniformly distributed.By above-mentioned rectification, acceleration and shaving effect, fluid is set to be realized in flow process
The separation of drop and gas.
Application of the demister of the present invention in the absorption tower using wet desulfurizing process, generally enter 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 advantages below：
1st, rectification passage has certain length, the gas of the more dispersed entrained drip of script velocity attitude, leads into rectification
Behind road, velocity attitude is changed to along the direction of rectification passage, velocity attitude comparison rule and concentration；And rectification passage total sectional area
Less than riser cross-sectional area, because circulation area reduces, the gas of entrained drip is set to enter speed increase after rectification passage.Circle
The section of tube inner surface groove is made up of a circular arc and straight line section, and the high-speed gas of entrained drip rotate along outer tube inner wall
When flowing up, drop is constantly thrown toward outer in the presence of inertia force, and drop enters groove and along the arc section in groove
Motion, because angle α is 5 ° ~ 70 °, drop can be made to continue on the arc surface of groove and do smooth motion, until running into straight
Go downstream along outer tube inner wall after line segment is hindered, and exist without dead band.Because outer barrel has one section of conical section, make gas outside
Speed remains unchanged substantially when cylinder inwall rotation flows up, and can still maintain stronger shaving effect, in rectification passage to cone
Gas-liquid separation can be effectively realized between shape section smallest cross-sectional.
2nd, the effect of demisting can be effectively achieved, effectively removes the less drop of particle diameter carried secretly in gas, demisting effect
Rate is high, reduces the harm to environment, serves the effect of environmental protection.
3rd, gas flow uniform, flow resistance is small, and resistance reduces.
4th, it is simple in construction, it is easy to make, it is not easily blocked 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.
Brief description of the drawings
Fig. 1 is the demister one of which structural representation of the present invention.
Fig. 2 is the schematic cross-section for the demister that rectification passage flushes with riser inwall.
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.
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 some rectification passages 3 on the circumference of riser 2, rectification passage 3 is along a liter gas
The tangential direction of the outer wall of pipe 2 is horizontal embedded, and side wall I and riser 2 tube wall of the rectification passage 3 close to the side of outer barrel 4 are tangent, another
Side wall II intersects with the tube wall of riser 2, and each direction of rotation of rectification passage 3 is identical；The top of rectification passage 3 flushes with capping plate 5, bottom
Intersect with the tube wall of riser 2 in portion；The diameter of outer barrel 4 is continuously reduced from the bottom to top or stepped reduction.In the demister of the present invention, outside
When 4 diameters of cylinder are continuously reduced from the bottom to top, outer barrel 4 is shaped as taper, and the taper angle theta of outer barrel 4 is 20 ° -80 °, preferably 30 ° -60 °.
In the demister of the present invention, during the diameter stepped reduction from the bottom to top of outer barrel 4, typically it is made up of 1 ~ 10 shell ring, 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, the area at the top of outer barrel 4 is the 1/3 ~ 2/3 of the cross-sectional area of riser 2.The top of outer barrel 4
It is 1~8 times, preferably 2~5 times of tangential flow guiding channel height to have certain distance P, P with the top of riser 2.The top of riser 2
Annulus area where the area of the part arbitrary cross section of outer barrel 4 above is less than the top of riser 2 at section（That is riser 2
The cross-sectional area at top 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 the lower edge of outer barrel 4 away from tower tray 1 are 5~100mm, 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 described outer barrel 4 can also connect direct tube section and/or inversed conical drum section；
The height of described direct tube section is the 1/20 ~ 1/10 of the height H of outer barrel 4；The height of described inversed conical drum section is the height H's of outer barrel 4
1/10~1/5.The order of connection typically 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, described rectification passage 3 typically 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 side wall II length, and width w is the both sides of rectification passage 3
Maximum horizontal range between wall, height h are the maximum normal distance between the top and bottom of rectification passage 3；Wherein length l is width
2 ~ 5 times of w, preferably 3 ~ 4 times；The cross sectional shape of rectification passage 3 be rectangle, ellipse, circle, it is trapezoidal or semicircle etc. in
One or more combination, the one or more combination in preferably rectangular, oval or circle.The size of rectification passage 3 according to
Actual operating mode or design requirement, are determined by those skilled in the art, and the height h of such as described rectification passage 3 is generally 20
~600mm, preferably 100~300mm；The width w of rectification passage 3 is generally 10~200mm, preferably 20~100mm.Rectification
The total sectional area of passage 3 is 0.2 ~ 0.9 times of the cross-sectional area of riser 2, preferably 0.3 ~ 0.6 times of the cross-sectional area of riser 2.
In the demister of the present invention, the side wall II ends of described rectification passage 3 can flush with the inwall of riser 2（Such as
Fig. 2）Or it extend into the inside certain distance m of riser 2（Such as Fig. 3）, m is 0.1 ~ 0.9 times, preferably 0.3 ~ 0.6 times of length l.
When the side wall II ends of rectification passage 3 flush with the inwall of riser 2, the bottom end of rectification passage 3 is also neat with the inwall of riser 2
It is flat（Such as Fig. 2）；When the side wall II of rectification passage 3 extend into 2 inside certain distance m of riser, the bottom end of rectification passage 3 with
Side wall end flushes（Such as Fig. 3）.
In the demister of the present invention, it is 20~200mm that the distance from bottom tower tray 1 of rectification passage 3, which has certain distance A, distance A,
Preferably 40~80mm.
In the demister of the present invention, the lower end of riser 2 is concordant with tower tray 1 or less than the segment distance of tower tray 1 one, the two closed company
Connect；The diameter of riser 2 and the percent opening of tower tray 1 can be according to the operating modes or design requirement of reality, by those skilled in the art
Determined.
In the demister of the present invention, described 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 setting groove 6 and/or projection of described outer barrel 4.Groove 6 or it is raised with
The diameter parallel of outer barrel 4, or can be formed an angle with axis；Groove 6 or the raised distribution in the inwall of outer barrel 4 can rules
Arrangement can also disordered arrangements；Groove 6 or projection can continuously be arranged along the inwall of outer barrel 4 and can also discontinuously arranged.Described is recessed
The section of groove 6 or projection can also be the suitable shapes such as rectangle, triangle or circle.
In the demister of the present invention, the inner surface of described 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 up of a circular arc and straight line section；The intersection point of wherein circular arc and the inner surface circumference of outer barrel 4 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 °, 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 °, preferably 45 ° ~ 90 °.The depth Z of groove 6,
That is circular arc and the beeline on straightway intersection point to the inner surface circumference of outer barrel 4, for 0.1 ~ 0.7 times of the wall thickness of outer barrel 4, it is preferably
0.3 ~ 0.5 times；Arc length between the intersection point and straightway of circular arc and the inner surface circumference of outer barrel 4 and the intersection point of the inner surface circumference of outer barrel 4,
For the 1/80 ~ 1/6 of the inner surface circumference of outer barrel 4.
In the demister of the present invention, the lower ending opening of described outer barrel 4 can also set toothing or wavy shaped configuration,
So as to advantageously be dripped in the liquid isolated from the inwall of outer barrel 4 into continuous stream.
The junction of each component of demister of the present invention ensures sealing, does not produce gas leak phenomenon.
The demister of the present invention, during work, the gas of entrained drip enters riser 2 from the lower space of tower tray 1, and gas phase is pressed from both sides
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, and part droplet due to effect of inertia with capping plate 5 collide, and be attached to capping plate 5 on, the drop of attachment is gradual
Become big, when drop arrives greatly climbing power of its own the caused gravity more than gas and when making a concerted effort of surface tension of liquid, drop is just
It is separated from capping plate 5 surface, completes first time gas-liquid separation.The gas edge level or level of approximation of entrained drip
Direction enters rectification passage 3, and because rectification passage 3 has certain length, and the total sectional area of rectification passage 3 is less than the horizontal stroke of riser 2
Sectional area, the gas of the more dispersed entrained drip of script velocity attitude, after rectification passage 3 is entered, velocity attitude is changed to edge
The direction of rectification passage 3, velocity attitude comparison rule and concentration, and because circulation area reduces, makes the gas of entrained drip
Speed increase after into rectification passage 3.When the velocity attitude of the gas of entrained drip changes, in partial drop and rectification passage 3
Wall collides, and is attached on the inwall of rectification passage 3, and then is constantly flowed through the gas blowout rectification passage 3 of rectification passage 3
And fall, complete second of gas-liquid separation.Meanwhile in rectification passage 3, because the gas velocity direction of entrained drip changes,
Mutually collision occurs under inertia force effect for part droplet, and droplet aggregation turns into big drop, and the gas stream of entrained drip
Speed increase, exacerbates the motion of drop, improves the probability that droplet mutually collides, can also make small liquid during rectified passage 3
Drop, which is easier aggregation, turns into big drop, and flows out rectification passage 3 with gas with larger speed.From tangential flow guiding passage stream
After going out, when the gas of entrained drip flow to riser 2 with 4 gap of outer barrel, due to circulation area increase, the gas speed of entrained drip
Degree slightly reduces, and the gas residence time increase of entrained drip, self gravitation arrives greatly the big drop quilt of the climbing power more than gas
Separate, complete third time gas-liquid separation.Now, the gas of entrained drip has larger speed, and velocity attitude compares
Concentrate, and the drop carried secretly is bigger, continuation collides with the inwall of outer barrel 4, changes the flow direction of gas again, that is, carries secretly
The gas of drop is by being changed to the circumferencial direction flowing along the inwall of outer barrel 4 along the direction of rectification passage 3.Due to the gas of entrained drip
Body speed is larger, and rotates and flow up along the inwall of outer barrel 4 for opening up fluted 6, therefore can produce obvious shaving
Effect.Described shaving effect, refer to the high-speed gas of entrained drip along the rotation of the inwall of outer barrel 4 flow up when, drop is used
Property power in the presence of be constantly thrown toward outer, drop enters groove 6 and moved along the arc section in groove 6, because angle α is 5 °
~ 70 °, drop can be made to continue on the arc surface of groove 6 and do smooth motion, contact aggregation change is big between drop, until running into
The straightway of groove 6 is hindered, and the drop that aggregation becomes big hits strongly with straightway wall, and is attached to straightway wall
On, drop continues to assemble and becomes big, and then is gone downstream along the inwall of outer barrel 4；And gas then continues along the rotation of the inwall of outer barrel 4 upwards
Flowing, realizes gas-liquid separation, and reduces entrainment for the 4th time.Gas continues to flow up along the rotation of the inwall of outer barrel 4
When, gas falls portion of energy with the continuous frictional dissipation of the inwall of outer barrel 4, gas velocity can be made to decrease, but because outer barrel 4 has one
Section conical section, gas rise when circulation area constantly reduce, the gas velocity of rising is remained unchanged substantially, can still maintain compared with
Strong shaving effect, in rectification passage 3 to can effectively realize gas-liquid separation between conical section smallest cross-sectional.The cone of outer barrel 4
There are one section of straight section and/or back taper section in shape section so that flow velocity is reduced when gas flows through this part, and gas is uniformly distributed.It is logical
Above-mentioned rectification, acceleration and shaving effect are crossed, fluid is realized 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
Show water concentration 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
Show water concentration in exhaust<0.6g/Nm3, demisting efficiency >=95%.
Claims (19)
- A kind of 1. high efficiency demister, it is characterised in that：Demister includes several demisting components arranged side by side, and each demisting component is equal Including riser and outer barrel, outer barrel is arranged on the outside of riser, and riser is fixed on tower tray, and the top of riser sets envelope Cover plate；Some rectification passages are uniformly arranged on the circumference of riser, tangential direction level of the rectification passage along riser outer wall is embedding Enter, side wall I and riser tube wall of the rectification passage close to outer barrel side are tangent, and another side wall II intersects with riser tube wall, whole Flushed at the top of circulation road with capping plate, bottom is intersected with riser tube wall；Each rectification passage direction of rotation is identical；Outer barrel diameter by Under supreme be continuously reduced or stepped reduction.
- 2. according to the demister described in 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. according to the demister described in claim 1, it is characterised in that：During outer barrel diameter stepped reduction from the bottom to top, outer barrel It is made up of 1 ~ 10 shell ring, the reduction amplitude of adjacent cylindrical section diameter is 2% ~ 10%, and top diameter is 0.4 ~ 0.9 times of base diameter.
- 4. according to the demister described in claim 1, it is characterised in that：Area at the top of outer barrel is the 1/ of riser cross-sectional area 3~2/3。
- 5. according to the demister described in 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.
- 6. according to the demister described in claim 1, it is characterised in that：Outer cylinder portion arbitrary cross section more than at the top of riser Area be less than annulus area where at the top of riser at section.
- 7. according to the demister described in 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.
- 8. according to the demister described in claim 1, it is characterised in that：The overall height H of outer barrel is tangential flow guiding channel height 2.5~10 times.
- 9. according to the demister described in claim 1, it is characterised in that：Described outer barrel conical top connection direct tube section and/ Or inversed conical drum section；The height of described direct tube section is the 1/20 ~ 1/10 of outer barrel height H；The height of described inversed conical drum section is outer The 1/10 ~ 1/5 of cylinder height H；The order of connection from down to up is one kind in following several ways：（1）Conical section, direct tube section and Back taper section；（2）Conical section and direct tube section；（3）Conical section and back taper section.
- 10. according to the demister described in claim 1, it is characterised in that：Described rectification passage sets 1 ~ 12.
- 11. according to the demister described in claim 1, it is characterised in that：The length l of rectification passage is side wall II length, 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 is rectangle, ellipse, circle, trapezoidal or semicircle In one or more combination.
- 12. according to the demister described in 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.
- 13. according to the demister described in claim 1, it is characterised in that：The side wall II ends of described 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 flushes with riser inwall, rectification channel bottom end flushes with riser inwall；When the side wall II of rectification passage stretches When entering to un-obstructed draft tube interior certain distance m, rectification channel bottom end flushes with side wall end.
- 14. according to the demister described in claim 1, it is characterised in that：Rectification channel bottom has certain distance A apart from tower tray, Distance A is 20~200mm.
- 15. according to the demister described in claim 1, it is characterised in that：Riser lower end is concordant with tower tray or less than tower tray one Segment distance, the two airtight connection.
- 16. according to the demister described in claim 1, it is characterised in that：The inner surface setting groove of described outer barrel and/or convex Rise.
- 17. according to the demister described in claim 1 or 16, it is characterised in that：The inner surface setting section shape of described outer barrel The groove that shape is made up of a circular arc and straight line section；The point of intersection of wherein circular arc and outer tube inner surface circumference does circular arc respectively With the tangent line of circumference, the angle α between tangent line is 5 ° ~ 70 °；Circular arc and the tangent line and straight line of the circular arc done at straightway intersection point The angle β of section is 30 ° ~ 110 °.
- 18. according to the demister described in claim 17, it is characterised in that：The depth Z of groove, i.e. circular arc and straightway intersection point are extremely Beeline on outer tube inner surface circumference, for 0.1 ~ 0.7 times of outer barrel wall thickness；The intersection point of circular arc and outer tube inner surface circumference and Arc length between the intersection point of straightway and outer tube inner surface circumference, it is the 1/80 ~ 1/6 of outer tube inner surface circumference.
- 19. according to the answering in the absorption tower of wet desulfurizing process of the demister described in claim 1 ~ 17 any claim With, it is characterised in that：Gas velocity into riser is 3-20m/s, and the gas velocity of rectification channel outlet is 10-40m/s, rectification passage The gas velocity of outlet is into 1.5 ~ 3 times of gas velocity of riser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610810054.3A CN107803068A (en) | 2016-09-08 | 2016-09-08 | A kind of high efficiency demister |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610810054.3A CN107803068A (en) | 2016-09-08 | 2016-09-08 | A kind of high efficiency demister |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107803068A true CN107803068A (en) | 2018-03-16 |
Family
ID=61576117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610810054.3A Pending CN107803068A (en) | 2016-09-08 | 2016-09-08 | A kind of high efficiency demister |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107803068A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111298523A (en) * | 2018-12-12 | 2020-06-19 | 中国石油化工股份有限公司 | Cyclone demister |
| CN114452725A (en) * | 2021-12-31 | 2022-05-10 | 中国石油化工股份有限公司 | Gas-liquid separation system |
| US20220226770A1 (en) * | 2021-01-15 | 2022-07-21 | Kabushiki Kaisha Toshiba | Carbon dioxide capture system and method of operating carbon dioxide capture system |
| CN115585138A (en) * | 2022-10-27 | 2023-01-10 | 珠海格力电器股份有限公司 | Compressor and air conditioner |
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| 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 |
| CN104606961A (en) * | 2013-11-05 | 2015-05-13 | 中国石油化工股份有限公司 | Flow baffling type demister |
| CN105107328A (en) * | 2015-09-16 | 2015-12-02 | 北京国能中电节能环保技术有限责任公司 | Venturi-based cyclone de-misting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN104606961A (en) * | 2013-11-05 | 2015-05-13 | 中国石油化工股份有限公司 | Flow baffling type demister |
| CN105107328A (en) * | 2015-09-16 | 2015-12-02 | 北京国能中电节能环保技术有限责任公司 | Venturi-based cyclone de-misting device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111298523A (en) * | 2018-12-12 | 2020-06-19 | 中国石油化工股份有限公司 | Cyclone demister |
| CN111298523B (en) * | 2018-12-12 | 2022-02-08 | 中国石油化工股份有限公司 | Cyclone demister |
| US20220226770A1 (en) * | 2021-01-15 | 2022-07-21 | Kabushiki Kaisha Toshiba | Carbon dioxide capture system and method of operating carbon dioxide capture system |
| US12453941B2 (en) * | 2021-01-15 | 2025-10-28 | Kabushiki Kaisha Toshiba | Carbon dioxide capture system and method of operating carbon dioxide capture system |
| CN114452725A (en) * | 2021-12-31 | 2022-05-10 | 中国石油化工股份有限公司 | Gas-liquid separation system |
| CN115585138A (en) * | 2022-10-27 | 2023-01-10 | 珠海格力电器股份有限公司 | Compressor and air conditioner |
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