CN104606959A - Inverted cone-shaped flow baffling demister - Google Patents

Inverted cone-shaped flow baffling demister Download PDF

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Publication number
CN104606959A
CN104606959A CN201310540491.4A CN201310540491A CN104606959A CN 104606959 A CN104606959 A CN 104606959A CN 201310540491 A CN201310540491 A CN 201310540491A CN 104606959 A CN104606959 A CN 104606959A
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China
Prior art keywords
demister
riser
conical drum
inversed conical
gas
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Granted
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CN201310540491.4A
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Chinese (zh)
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CN104606959B (en
Inventor
王璐瑶
彭德强
王岩
陈建兵
孟凡飞
陈新
姜阳
孟凡忠
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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Publication of CN104606959A publication Critical patent/CN104606959A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/06Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D45/00Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/08Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separating Particles In Gases By Inertia (AREA)

Abstract

The present invention discloses an inverted cone-shaped flow baffling demister, which comprises a plurality of demisting assemblies, wherein each demisting assembly comprises a gas rising pipe and an inverted cone cylinder, the inverted cone 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, and the gas rising pipe circumference close to each seam is provided with tangential diversion wings. According to the inverted cone-shaped flow baffling demister, the separation of the liquid droplet and the gas is achieved through the multiple flow baffling during the fluid flowing process; and the inverted cone-shaped flow baffling 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

Back taper baffling demister
Technical field
The present invention relates to a kind of back taper baffling 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 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 back taper deflector type demister, described demister comprises several demist assemblies arranged side by side, and each demist assembly includes riser and inversed conical drum, and inversed conical drum 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 inversed conical drum is higher than the upper edge of riser.And inversed conical drum is lower to distance tower tray certain distance.
In deflector type demister of the present invention, the inner surface of described inversed conical drum can also arrange projection.Described projection is parallel with the bus of inversed conical drum, or can form an angle with bus.The cross section of described projection can be rectangle, triangle, circular arc or circle.In the present invention, described projection preferably adopts cross section to be the clapper structure of rectangle.Wherein, the direction of rotation of hyoplastron is identical with the direction of rotation of the tangential flow guiding wing or contrary, preferably adopts contrary direction of rotation.
Wherein, the lower ending opening of described inversed conical drum can also be arranged to zigzag structure, thus advantageously becomes Continuous Flow to drip in isolated liquid from the inwall of inversed conical drum.
In deflector type demister of the present invention, wherein can also offer groove further at the inwall of inversed conical drum, the cross section of groove can be the suitable shape such as triangle, circular arc or rectangle.Described groove can be arranged with bulge clearance.
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 meeting capping plate, gas phase flow direction changes (changing level or level of approximation direction into by ascent direction), and droplet collides due to effect of inertia and capping plate, 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 just gets off from capping plate is separated on the surface, complete a gas-liquid separation.The line of rabbet joint 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 the droplet be not removed is captured through identical effect at tangential flow guiding wing turning, completes another gas-liquid separation.Not separated gas-liquid two-phase continues flowing, because inversed conical drum inwall is provided with hyoplastron, when running into the hyoplastron on inversed conical drum inwall, owing to there is airbond, gas flow direction changes again, and droplet is attached to the turning on the inwall hyoplastron of inversed conical drum, it is large that drop assembles change, crack along hyoplastron and barrel flows down, and accelerates coalescence, reduces entrainment.Drop is when flowing downward, and inversed conical drum lower end diameter diminishes, and gas flow rates improves, and blows drop and hurtles down, realize gas-liquid separation.
Compared with prior art, back taper 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, because the diameter of inversed conical drum lower end diminishes, the gas speed flowed downward is improved, and gas phase blows droplets fall, accelerates gas-liquid separation process.
3, inversed conical drum inwall is arranged protruding especially arrange the hyoplastron contrary with tangential flow guiding wing direction of rotation, when the gas stitching out from the bar riser brushes projection, experience airbond, can suppress or eliminate the cyclonic action of gas effectively; Simultaneously, brush projection significantly to reduce with the speed of the gas of back taper barrel 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 inversed conical drum, and down become Continuous Flow to drip along crack, thus reduce further entrainment.
Accompanying drawing explanation
Fig. 1 is a kind of demister structural representation of the present invention.
Fig. 2 is the schematic cross-section of a kind of demister riser tangential flow guiding wing of the present invention and inversed conical drum hyoplastron.
Respectively be labeled as in figure: 1-tower tray; 2-riser; 3-inversed conical drum; The 4-tangential flow guiding wing; 5-capping plate; 6-is protruding; 7-bar stitches.
Detailed description of the invention
Below in conjunction with drawings and Examples, a kind of demister of the present invention is described in further detail.
Demister of the present invention generally comprises several demist assemblies arranged side by side.As depicted in figs. 1 and 2, each demist assembly includes riser 2 and inversed conical drum 3, and inversed conical drum 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.
Riser tube wall is offered the size of bar seam, can need or design requirement according to the operating mode of reality, be determined by those skilled in the art.As described in can be 20 ~ 500mm, preferably 200 ~ 350mm the height h that stitches of bar; The width L of bar seam 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 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 deflector type demister of the present invention, wherein the upper end of inversed conical drum 3 is higher than capping plate 4, and inversed conical drum 3 is lower to distance tower tray 1 certain distance.Back taper 3 is arranged on the outside of riser, and coaxial with riser.The general θ of taper angle of inversed conical drum is 20 ~ 120 °, preferably 40 ~ 70 °.The lower edge of inversed conical drum should lower than the lower edge of bar seam.Under stitching along distance riser bar under inversed conical drum, the vertical range B on edge can be generally 20 ~ 260mm, preferably 50 ~ 80mm.Inversed conical drum lower end (opening) diameter phi can be generally 1.1 times ~ 1.6 times of draft tube diameter, preferably 1.1 times ~ 1.2 times.The height H of inversed conical drum can be generally 1.3 times ~ 2 times of riser bar seam height.Under inversed conical drum, edge can be generally 5 ~ 100mm, preferably 20 ~ 50mm apart from the height C of tower tray 1.
As shown in Figure 2: in deflector type demister of the present invention, the inner surface (inwall) of inversed conical drum 3 can also arrange some protruding 6.Protruding 6 parallel with the bus of inversed conical drum 3, or can form an angle with bus, as described in angle be generally 5 ~ 45 °, preferably 10 ~ 30 °.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 in fig. 2, protruding 6 is clapper structure.Protruding 6 are generally uniformly distributed on the inner surface of inversed conical drum, 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.
Wherein when protruding 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 inversed conical drum 3 can also be arranged to zigzag structure, thus advantageously becomes Continuous Flow to drip in isolated liquid from the inwall of inversed conical drum.
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 line of rabbet joint 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 inversed conical drum 3, because inversed conical drum 3 inwall is provided with projection (hyoplastron), there is airbond when running into projection (hyoplastron) on inversed conical drum 3 inwall in gas phase, gas flow direction changes again, and droplet is attached to the turning in the inwall projection (hyoplastron) of inversed conical drum 3, it is large that drop assembles change, crack along protruding (hyoplastron 6) and barrel flows down, and accelerates coalescence, reduces entrainment.Drop is when flowing downward, and inversed conical drum lower end diameter diminishes, and gas flow rates improves, and blows drop and hurtles down, finally realize gas-liquid separation.
Embodiment
Certain wet scrubber tower purifying smoke 180000Nm 3/ h, wherein aobvious water concentration is 10 ~ 15g/Nm 3, aobvious water concentration <0.5g/Nm in demister demist final vacuum of the present invention 3, demisting efficiency >90%.

Claims (19)

1. a back taper deflector type demister, is characterized in that, described demister comprises several demist assemblies arranged side by side, and each demist assembly includes riser and inversed conical drum, and inversed conical drum 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; The inwall of described inversed conical drum is provided with projection, and described projection is parallel with the bus of inversed conical drum, or forms an angle with bus.
2. according to demister according to claim 1, it is characterized in that, the cross section of described projection is rectangle, triangle, circular arc or circle.
3. according to the demister described in claim 1 or 2, it is characterized in that, described projection is hyoplastron.
4. according to demister according to claim 3, it is characterized in that, the tilting angle γ of described hyoplastron is 5 ° ~ 45 °, preferably 10 ~ 30 °.
5. 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 °.
6. according to the demister described in claim 4 or 5, 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.
7. according to demister according to claim 1, it is characterized in that, the upper edge of described inversed conical drum is higher than the upper edge of riser.
8. according to demister according to claim 1, it is characterized in that, the lower edge distance tower tray certain distance of described inversed conical drum.
9. according to demister according to claim 1, it is characterized in that, the lower ending opening of described inversed conical drum is arranged to zigzag structure.
10., according to demister according to claim 1, it 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.
11., 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.
12., according to demister according to claim 10, is characterized in that, the quantity of the described tangential flow guiding wing is 1.5 ~ 3 times of riser bar seam quantity.
13. according to demister according to claim 1, it 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 described inversed conical drum is 20 ~ 120 °, preferably 40 ~ 70 °.
15., according to demister according to claim 1, is characterized in that, the lower edge that the lower edge of described inversed conical drum is stitched lower than bar.
16., according to demister according to claim 15, is characterized in that, the lower of described inversed conical drum is 20 ~ 260mm along the vertical range B apart from the lower edge of riser bar seam, preferably 50 ~ 80mm.
17., according to demister according to claim 1, is characterized in that, the lower end diameter φ of described inversed conical drum is 1.1 times ~ 1.6 times of draft tube diameter, preferably 1.1 times ~ 1.2 times; The height H of described inversed conical drum is 1.3 times ~ 2 times of riser bar seam height.
18., according to demister according to claim 8, is characterized in that, the lower of described inversed conical drum is 5 ~ 100mm, preferably 20 ~ 50mm along the height C apart from tower tray.
19., according to demister according to claim 1, is characterized in that, also have groove at the inwall of inversed conical drum, and described groove and bulge clearance are arranged.
CN201310540491.4A 2013-11-05 2013-11-05 Inverted cone-shaped flow baffling demister Active CN104606959B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN121266235A (en) * 2025-11-03 2026-01-06 株洲英东实业有限公司 Flue gas purification device for producing ultra-clean high-purity hydrofluoric acid

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331684A1 (en) * 1993-09-17 1995-03-23 Linde Ag Apparatus for the phase separation of a gas/liquid stream, if appropriate with previous mixing
US6146597A (en) * 1997-03-14 2000-11-14 Petroleum Energy Center Separation device
EP1681522A2 (en) * 2003-12-09 2006-07-19 Fujikoki Corporation Gas liquid separator
CN202015519U (en) * 2011-01-18 2011-10-26 青岛汇森能源设备有限公司 Gas-liquid separator
CN203724891U (en) * 2013-11-05 2014-07-23 中国石油化工股份有限公司 Inverted conical baffling demister

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331684A1 (en) * 1993-09-17 1995-03-23 Linde Ag Apparatus for the phase separation of a gas/liquid stream, if appropriate with previous mixing
US6146597A (en) * 1997-03-14 2000-11-14 Petroleum Energy Center Separation device
EP1681522A2 (en) * 2003-12-09 2006-07-19 Fujikoki Corporation Gas liquid separator
CN202015519U (en) * 2011-01-18 2011-10-26 青岛汇森能源设备有限公司 Gas-liquid separator
CN203724891U (en) * 2013-11-05 2014-07-23 中国石油化工股份有限公司 Inverted conical baffling demister

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN121266235A (en) * 2025-11-03 2026-01-06 株洲英东实业有限公司 Flue gas purification device for producing ultra-clean high-purity hydrofluoric acid

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