CN104606960A - Flow baffling type demister - Google Patents
Flow baffling type demister Download PDFInfo
- Publication number
- CN104606960A CN104606960A CN201310540457.7A CN201310540457A CN104606960A CN 104606960 A CN104606960 A CN 104606960A CN 201310540457 A CN201310540457 A CN 201310540457A CN 104606960 A CN104606960 A CN 104606960A
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- Prior art keywords
- demister
- urceolus
- riser
- gas
- rising pipe
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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
-
- 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
- B01D45/06—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
The present invention discloses a flow baffling type demister, which comprises a plurality of demisting assemblies aligned in parallel, wherein each demisting assembly comprises a gas rising pipe and an outer cylinder, the outer cylinder is arranged on the outer side of the gas rising pipe and is at the same axis line as the gas rising pipe, the gas rising pipe is fixed on a tower disk, the top portion of the gas rising pipe is provided with a sealing cover plate, the circumference of the gas rising pipe is provided with a plurality of seams, the gas rising pipe circumference close to each seam is provided with tangential diversion wings, the inner surface of the outer cylinder is provided with a plurality of projections, and the outer cylinder comprises the straight cylinder section on the upper portion and the taper cylinder section on the lower portion. According to the flow baffling type demister, the separation of the liquid droplet and the gas is achieved through the flow baffling during the fluid flowing process; and the flow baffling type demister has characteristics of simple structure, easy installation and effective gas-liquid separation achieving, and is suitable for the gas-liquid separation process in the fields of chemical industry, environmental protection, and the like.
Description
Technical field
The present invention relates to a kind of deflector type demister, belong to the gas-liquid separation field in Chemical Engineering, be applicable to the gas-liquid separation process in the field such as chemical industry and environmental protection.
Background technology
SO
2the major reason causing China's atmosphere pollution with dust, the atmosphere pollution of the current priority control of Ye Shi China.At present, mostly adopt wet processing at field of Environment Protection, in wet processing flue gas desulfurization course, absorption tower, in running, easily produces " mist " that particle diameter is 10 ~ 60 microns, not only containing moisture, is also dissolved with sulfuric acid, sulfate, SO
2deng, atmospheric environment is polluted, more serious corrosion is caused to aiutage and heat exchanger etc. simultaneously.Therefore, in wet desulfurizing process, Purge gas must demist before leaving absorption tower.
Demister is the treatment facility of the field such as chemical industry or environmental protection for gas-liquid separation.When the gas containing mist passes through demister with certain speed, can bump against with demister internal structure, and depend in its surface.Mist on demister internal structure surface, the effect through diffusion and gravity can progressively be assembled, and after weight reaches certain level, will separate from demister internal structure.Thus realize gas-liquid separation.Demister is generally arranged on top, absorption tower.When demister causes because of fouling resistance drop to increase to predetermined value in running, just need to start backwashing procedures and demister is rinsed, generally, all need to arrange flooding nozzle at demister inlet end and exhaust end.Now may cause gas phase seriously carrying secretly liquid phase, cause gas phase band liquid.
Many types can be divided into, as mesh mist eliminator, collapser demister, rotational flow plate defroster, electrostatic precipitator, venetian blind type demister and gravitational settling type demister etc. according to the purposes of demister, structure.Conventional has mesh mist eliminator, collapser demister, rotational flow plate defroster etc.Although mesh mist eliminator can be separated general mist, require that mist is clean, air-flow velocity is less, and resistance drop is large, life cycle is short, and equipment investment is large.Current demister generally all adopts horizontally disposed, demister gas flow direction is vertical with silk screen, when gas speed is lower, the mist inertia carried secretly is little, drifts in gas, can not be removed with silk screen making contact, and due to separated drop and gas phase be that adverse current flows to, gas easily produces reentrainment to drop, thus gas-liquid separation efficiency is reduced, and the problems such as mesh mist eliminator also exists easy blocking, and Pressure Drop is large.Blade type, herringbone demister inside is provided with the deflection plate that direction is different, shape is different, and to form little runner, increase except fog effect, structure is more complicated, and separating effect is bad.The separated drop of rotational flow plate defroster is identical with gas flow, easily produces reentrainment, reduces demisting efficiency, and pressure drop is large, and energy consumption is higher.
The demister element that patent CN200410014713.X introduces is made up of deflection plate and flue gas flow field adjustment block, deflection plate is fixed in flue gas flow field adjustment block, the density of deflection plate and shape according to flow area everywhere flow field parameter change and change, thus the flow area of air-flow in absorption tower is evenly distributed.Still do not break away from drop descent, gas-liquid counter current phenomenon, namely easily produces reentrainment.The demister that patent CN200920128824.1 introduces is made up of cooler, thick demister and smart demister etc., thick demister is corrugated sheet or demist plate, essence demister is steel wire, this demister changes the shortcoming of traditional demister drop and airflow direction counter-current flow, improves demisting efficiency, but this demister structure is more complicated, make difficulty, and owing to have employed screen net structure, demister pressure drop is comparatively large, also than being easier to blocking.
The rotational flow plate defroster that patent CN200720038084.3 introduces is made up of blade, blind plate, cover cylinder and ring flat-plate, this demister mainly utilizes blade to rotate to promote gas, droplet is subject to the effect of centrifugal force, be thrown toward tower wall, droplet coalescence is collected, and completes gas-liquid separation, but this demister is when making gas phase form centrifugal force, need higher gas speed, so pressure drop is comparatively large, energy consumption is higher.
US Patent No. 7618472B2 provides a kind of vane-type demister, and this demister is made up of corrugated sheet, flat board and louver board etc., and forms a lot of cavity or runner.After gas-liquid mixture enters demister, fluid course offsets, and make direction of flow be able to change for several times, and velocity variations quickly, liquid phase is easy to from gas phase separation out.This technology liquid phase, by gas phase separation process, can realize gas liquid cross-flow, and therefore the reentrainment effect of gas phase to drop reduces greatly, but this technical pattern is very complicated, and difficulty of processing is also larger, and corresponding processing and fabricating expense is higher.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of deflector type demister, realize being separated of drop and gas by the repeatedly baffling of fluid in flow process.Demister structure of the present invention is simple, and pressure drop is little, easy for installation, effectively can realize gas-liquid separation.
The invention provides a kind of deflector type demister, described demister comprises several demist assemblies arranged side by side, and each demist assembly includes riser and urceolus, and urceolus is arranged on the outside of riser, and with riser on the same axis; Riser is fixed on tower tray, and the top of riser arranges capping plate, has some seams at the circumference of riser, is circumferentially provided with the tangential flow guiding wing at the riser near each bar seam.
According to demister of the present invention, the upper edge of wherein said urceolus higher than the upper edge of riser, the upper edge that the upper edge of preferred urceolus is stitched higher than bar.And urceolus is lower to distance tower tray certain distance, simultaneously should lower than the lower edge of bar seam.
In deflector type demister of the present invention, wherein said urceolus is made up of direct tube section and conical cylinder section.Along the upper edge higher than riser on the direct tube section of urceolus, and the conical cylinder section of urceolus is the upright frustum of a cone, and the upper edge of the preferred frustum of a cone is lower than edge under the bar seam of riser.
In deflector type demister of the present invention, the inner surface (inwall) of described urceolus can also arrange projection.Described projection at the direct tube section of urceolus and straight tube axis being parallel, or can form an angle with straight tube axis, protrudingly forms an angle in the part of urceolus conical cylinder section and the bus of the frustum of a cone.The cross section of described projection can be rectangle, triangle, circular arc or circle, and the projection described in the present invention preferably adopts cross section to be the clapper structure of rectangle.Wherein, the direction of rotation of hyoplastron should be contrary with the direction of rotation of the tangential flow guiding wing.
In deflector type demister of the present invention, the lower ending opening of described urceolus can also be arranged to zigzag structure, thus advantageously becomes Continuous Flow to drip in isolated liquid from the inwall of urceolus.
The gas of entrained drip enters riser from tower tray lower space, gas phase is in uphill process, because draft tube diameter is little, gas speed is improved, Vapor Entrainment liquid phase rises, after running into capping plate, gas phase flow direction changes (changing level or level of approximation direction into by ascent direction), and the droplet carried secretly collides due to effect of inertia and capping plate, and be attached on capping plate, the drop of attachment becomes large gradually, when drop arrive greatly climbing power that the gravity that himself produces exceedes gas and surface tension of liquid with joint efforts time, drop just gets off from capping plate is separated on the surface, complete a gas-liquid separation.The bar seam that not separated gas-liquid two-phase is offered from riser top flows out, under the guide functions of the tangential flow guiding wing, gas phase is changed again, and not removed droplet is captured through identical effect at tangential flow guiding wing turning, completes another gas-liquid separation.Gas-liquid two-phase separated not yet continues flowing, because outer tube inner wall is provided with hyoplastron, when running into the hyoplastron on outer tube inner wall, owing to there is airbond, gas flow direction changes again, and droplet is attached to the turning on the inwall hyoplastron of urceolus, it is large that drop assembles change, crack along hyoplastron and barrel flows down, and accelerates coalescence, reduces entrainment.Bottom due to urceolus is conical cylinder section, and the gas phase of entrained drip, when flowing downward, again baffling occurs, and gas phase velocity slows down further, droplet is captured again at the direct tube section of urceolus and the turning of conical cylinder section, and drop assembles the large whereabouts of change, realizes the efficient separation of gas-liquid.
Compared with prior art, deflector type demister of the present invention has the following advantages:
1, effectively can remove the drop that the particle diameter carried secretly in gas is less, demisting efficiency is high.The capping plate on riser top and the tangential flow guiding wing make the gas phase generation baffling carrying droplet secretly, realize gas-liquid separation.
2, outer tube inner wall is arranged protruding when the hyoplastron of reverse rotation is especially set, when the gas stitching out from the bar riser brushes projection, meet with airbond, can effectively suppress or eliminate the cyclonic action of gas; Simultaneously, brush projection significantly to reduce with the speed of the gas of outer tube wall crack, the drop carried secretly in gas will be separated and be attached on inwall from gas, and accelerate coalescence along the protruding crack formed with urceolus, and down become Continuous Flow to drip along crack, thus reduce further entrainment.
3, urceolus is made up of direct tube section and conical cylinder section, and the gas phase of entrained drip is when flowing downward, and the gas prompt drop carrying liquid phase secretly is low, and there is baffling again, droplet is captured again at the direct tube section of urceolus and the turning of conical cylinder section, and drop assembles the large whereabouts of change, realizes gas liquid high-efficiency and is separated.
Accompanying drawing explanation
Fig. 1 is the structural representation of deflector type demister of the present invention.
Fig. 2 is the schematic cross-section of the deflector type demister riser tangential flow guiding wing of the present invention and urceolus hyoplastron.
Respectively be labeled as in figure: 1-tower tray; 2-riser; 3-urceolus; The 4-tangential flow guiding wing; 5-capping plate; 6-projection (hyoplastron); 7-bar stitches; 8-direct tube section; 9-conical cylinder section.
Detailed description of the invention
Below in conjunction with drawings and Examples, deflector type demister of the present invention is described in further detail.
Demister of the present invention comprises several demist assemblies arranged side by side.As depicted in figs. 1 and 2, each demist assembly includes riser 2 and urceolus 3, and urceolus 3 is arranged on the outside of riser 2, and with riser 2 on the same axis; Riser 2 is fixed on tower tray 1, and the top of riser arranges capping plate 5, has some seams 7 at the circumference of riser, is circumferentially provided with the tangential flow guiding wing 4 at the riser near each bar seam 7.
Riser tube wall is offered the size of bar seam 7, can need or design requirement according to the operating mode of reality, be determined by those skilled in the art.As described in bar seam 7 height h can be 20 ~ 500mm, preferably 200 ~ 350mm; The width L of bar seam 7 can be generally 20 ~ 120mm, preferably 50 ~ 80mm.The area that always cracks of described bar seam can be generally 3 ~ 5 times of riser sectional area.Stitch 7 connected position with bar and be provided with the tangential flow guiding wing, and the direction of rotation of the tangential flow guiding wing is consistent, the tangential flow guiding wing mainly plays drainage and baffling effect.The angle [alpha] that the tangential flow guiding wing tilts is generally 5 ° ~ 45 °, preferably 15 ° ~ 30 °.Riser top is provided with capping plate, is connected with riser tube wall is airtight.
In baffling demister of the present invention, wherein urceolus 3 is made up of the direct tube section 8 on top and conical cylinder section 9 two parts of bottom, and conical cylinder section is the upright frustum of a cone.The upper end of urceolus 3 is higher than capping plate 4, and urceolus 3 is lower to distance tower tray 1 certain distance.Urceolus 3 is arranged on the outside of riser, and coaxial with riser.The lower edge of 7 should be stitched in the upper edge of the conical cylinder section of urceolus lower than bar.The vertical range B that 7 times edges are stitched apart from riser bar in the lower edge of urceolus conical cylinder section can be generally 20 ~ 260mm, preferably 50 ~ 80mm.The direct tube section diameter N of urceolus can be generally 1.1 times ~ 1.6 times of draft tube diameter, preferably 1.1 times ~ 1.2 times.The diameter phi of the conical cylinder section lower ending opening of urceolus can be generally 1.2 times ~ 1.6 times of direct tube section diameter, preferably 1.3 times ~ 1.4 times.The height H of urceolus can be generally 1.3 times ~ 2 times of riser bar seam height.The direct tube section height K of urceolus is 1.1 ~ 1.3 times of conical cylinder section height F.Under the conical cylinder section of urceolus, edge can be generally 5 ~ 100mm, preferably 20 ~ 50mm apart from the height C of tower tray 1.The taper angle theta of the conical cylinder section of described urceolus is 20 ~ 120 °, preferably 40 ~ 70 °.
As depicted in figs. 1 and 2: in deflector type demister of the present invention, the inner surface (inwall) of urceolus 3 can also arrange some protruding 6, protruding 6 at the direct tube section of urceolus 3 and axis being parallel, or can form an angle with axis, and protruding 6 at the conical cylinder section of urceolus 3 and the frustum of a cone
busform an angle, described angle can be 10 ° ~ 45 °, preferably 15 ° ~ 25 °.The cross section of protruding 6 can be rectangle, triangle or circular arc, is preferably rectangle in the present invention, i.e. protruding preferably hyoplastron.As shown in Figure 2, protruding 6 is hyoplastron.Protruding 6 are generally uniformly distributed on the inner surface of urceolus, and its quantity is 1.5 ~ 3 times of riser bar seam quantity.Some direction of rotation of protruding 6 are consistent, identical with the direction of rotation of the tangential flow guiding wing 4 or contrary, preferably contrary with the direction of rotation of the tangential flow guiding wing.
When its protrusions 6 is hyoplastron, its angle γ tilted can be 5 ° ~ 45 °, preferably 10 ~ 30 °.
In deflector type demister of the present invention, the lower ending opening of described urceolus 3 can also be arranged to zigzag structure, thus advantageously becomes Continuous Flow to drip in isolated liquid from the inwall of urceolus.
During work, the gas of entrained drip enters riser 2 from tower tray 1 lower space, gas phase is in uphill process, because draft tube diameter is little, gas speed is improved, Vapor Entrainment liquid phase rises, after meeting capping plate 5, gas phase flow direction changes, and droplet collides due to effect of inertia and capping plate 5, and be attached on capping plate, the drop of attachment becomes large gradually, drop arrive greatly climbing power that the gravity that himself produces exceedes gas and surface tension of liquid with joint efforts time, drop drips on the surface from capping plate 5, completes a gas-liquid separation.The bar seam that not separated gas-liquid two-phase is offered from riser 2 top flows out, under the guide functions of the tangential flow guiding wing 4, gas liquid two-phase flow direction is changed again, and the droplet be not removed is captured at the tangential flow guiding wing 4 turning, completes another gas-liquid separator.Gas-liquid two-phase separated not yet continues flowing, when running into urceolus 3, because urceolus 3 inwall is provided with projection (hyoplastron), there is airbond when running into projection (hyoplastron) on urceolus 3 inwall in gas phase, gas flow direction changes again, and droplet is attached to the turning in the inwall projection (hyoplastron) of urceolus 3, it is large that drop assembles change, crack along protruding (hyoplastron 6) and barrel flows down, and accelerates coalescence, reduces entrainment.Bottom due to urceolus 3 is conical cylinder section, and the gas phase of entrained drip is when flowing downward, and baffling occurs for another, and gas phase velocity slows down, droplet is captured again at the direct tube section of urceolus 3 and the turning of conical cylinder section, and drop assembles the large whereabouts of change, realizes gas-liquid separation.
Embodiment
Certain wet scrubber tower purifying smoke 180000Nm
3/ h, wherein aobvious water concentration is 10 ~ 15g/Nm
3, in demist final vacuum of the present invention, aobvious water concentration is less than 0.5g/Nm
3, demisting efficiency is greater than 90%.
Claims (17)
1. a deflector type demister, is characterized in that, described demister comprises several demist assemblies arranged side by side, and each demist assembly includes riser and urceolus, and urceolus is arranged on the outside of riser, and with riser on the same axis; Riser is fixed on tower tray, and the top of riser arranges capping plate, has some seams at the circumference of riser, is circumferentially provided with the tangential flow guiding wing at the riser near each bar seam; At the inner surface of urceolus, some projections are set; Wherein said urceolus is made up of the direct tube section on top and bottom conical cylinder section.
2. want it to ask demister described in 1 according to right, it is characterized in that, along the upper edge higher than riser on the direct tube section of described urceolus, and along distance tower tray certain distance under urceolus.
3. according to demister according to claim 2, it is characterized in that, the lower edge that the upper edge of described urceolus conical cylinder section is stitched lower than bar.
4. according to demister according to claim 1, it is characterized in that, described projection at the direct tube section of urceolus and straight tube axis being parallel, or forms an angle with straight tube axis, protrudingly forms an angle in the part of urceolus conical cylinder section and the bus of the frustum of a cone.
5. according to the demister described in claim 1 or 4, it is characterized in that, the cross section of described projection is rectangle, triangle, circular arc or circle.
6. according to demister according to claim 5, it is characterized in that, the cross section of described projection is rectangle, and namely described projection is clapper structure.
7. according to demister according to claim 6, it is characterized in that, the tilting angle γ of described hyoplastron is 5 ° ~ 45 °, preferably 10 ~ 30 °.
8. according to demister according to claim 7, it is characterized in that, the direction of rotation of described hyoplastron is contrary with the direction of rotation of the tangential flow guiding wing.
9. according to demister according to claim 1, it is characterized in that, the tilting angle [alpha] of the described tangential flow guiding wing is 5 ° ~ 45 °, preferably 15 ° ~ 30 °.
10. according to demister according to claim 1, it is characterized in that, the lower ending opening of described urceolus is arranged to zigzag structure.
11., according to demister according to claim 1, is characterized in that, on riser open bar seam height h be 20 ~ 500mm, preferably 200 ~ 350mm; The width L of bar seam is 20 ~ 120mm, preferably 50 ~ 80mm.
12., according to demister according to claim 1, is characterized in that, the gross area of described bar seam is 3 ~ 5 times of riser sectional area.
13., according to demister according to claim 1, is characterized in that, described capping plate is connected with riser tube wall is airtight.
14., according to demister according to claim 1, is characterized in that, the taper angle theta of the conical cylinder section of described urceolus is 20 ~ 120 °, preferably 40 ~ 70 °.
15., according to demister according to claim 15, is characterized in that, the lower end diameter φ of described urceolus is 1.1 times ~ 1.6 times of draft tube diameter, preferably 1.1 times ~ 1.2 times.
16., according to demister according to claim 1, is characterized in that, the height H of described urceolus is 1.3 times ~ 2 times of riser bar seam height.
17., according to demister according to claim 7, is characterized in that, the lower of described urceolus is 5 ~ 100mm, preferably 20 ~ 50mm along the height C apart from tower tray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310540457.7A CN104606960B (en) | 2013-11-05 | 2013-11-05 | A kind of deflector type demister |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310540457.7A CN104606960B (en) | 2013-11-05 | 2013-11-05 | A kind of deflector type demister |
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| Publication Number | Publication Date |
|---|---|
| CN104606960A true CN104606960A (en) | 2015-05-13 |
| CN104606960B CN104606960B (en) | 2017-10-03 |
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ID=53141768
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310540457.7A Active CN104606960B (en) | 2013-11-05 | 2013-11-05 | A kind of deflector type demister |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023118860A1 (en) * | 2021-12-22 | 2023-06-29 | Edwards Limited | Mist trap |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2830910Y (en) * | 2005-04-16 | 2006-10-25 | 李焕昌 | Flue gas purifier of wetting boiler |
| CN201299984Y (en) * | 2008-11-03 | 2009-09-02 | 山东科技大学 | High-speed three-dimensional mass-transfer tower plate with super-large air flow |
| CN203215814U (en) * | 2013-04-23 | 2013-09-25 | 黎广福 | Oil fume filter device for kitchens |
| CN203540219U (en) * | 2013-11-05 | 2014-04-16 | 中国石油化工股份有限公司 | Baffling type demister |
-
2013
- 2013-11-05 CN CN201310540457.7A patent/CN104606960B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2830910Y (en) * | 2005-04-16 | 2006-10-25 | 李焕昌 | Flue gas purifier of wetting boiler |
| CN201299984Y (en) * | 2008-11-03 | 2009-09-02 | 山东科技大学 | High-speed three-dimensional mass-transfer tower plate with super-large air flow |
| CN203215814U (en) * | 2013-04-23 | 2013-09-25 | 黎广福 | Oil fume filter device for kitchens |
| CN203540219U (en) * | 2013-11-05 | 2014-04-16 | 中国石油化工股份有限公司 | Baffling type demister |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023118860A1 (en) * | 2021-12-22 | 2023-06-29 | Edwards Limited | Mist trap |
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| Publication number | Publication date |
|---|---|
| CN104606960B (en) | 2017-10-03 |
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