CN104606961A - Flow baffling type demister - Google Patents
Flow baffling type demister Download PDFInfo
- Publication number
- CN104606961A CN104606961A CN201310540458.1A CN201310540458A CN104606961A CN 104606961 A CN104606961 A CN 104606961A CN 201310540458 A CN201310540458 A CN 201310540458A CN 104606961 A CN104606961 A CN 104606961A
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- Prior art keywords
- demister
- riser
- urceolus
- gas
- groove
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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, 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 the direct tube section on top and the conical cylinder section of bottom, and the conical cylinder section of urceolus is the upright frustum of a cone.Along the upper edge higher than riser on the direct tube section of urceolus, 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 have some grooves.The part of described groove at direct tube section and the axis being parallel of straight tube, or can form an angle with axis.Described groove 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 groove can be the shape that rectangle, triangle or circular arc etc. are suitable, and the cross section of groove described in the present invention is preferably triangle.
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 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 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.Not separated gas-liquid two-phase continues flowing, when groove on the direct tube section inwall running into urceolus and inwall, owing to there is airbond, gas flow direction changes again, the straight tube inwall that droplet is attached to urceolus is assembled and becomes large, flow down in barrel and groove, accelerate coalescence, reduce entrainment.Bottom due to urceolus 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, and 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 separation.
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 has groove, under the brushing and oppress of gas phase, make the drop diffusion be attached on inwall flow into groove and accelerate coalescence, can entrainment be reduce further.
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 separation.
Accompanying drawing explanation
Fig. 1 is deflector type demister structural representation of the present invention.
Fig. 2 is the A-A schematic cross-section of riser in Fig. 1, the tangential flow guiding wing.
Fig. 3 is the another kind of structural representation of deflector type demister of the present invention.
Fig. 4 is the A-A schematic cross-section of riser in Fig. 3, the tangential flow guiding wing.
Fig. 5 is the sectional view offering groove in Fig. 3.
Respectively be labeled as in figure: 1-tower tray; 2-riser; 3-urceolus; The 4-tangential flow guiding wing; 5-capping plate; 6-bar stitches; 7-groove; 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.
Deflector type demister of the present invention comprises several demist assemblies.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 6, 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 6 height h can be 20 ~ 500mm, preferably 200 ~ 350mm; The width L of bar seam 6 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 6 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 urceolus 3 is made up of direct tube section and conical cylinder section two parts, and conical cylinder section is the upright frustum of a cone, and 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 6 should be stitched in the upper edge of the conical cylinder section of urceolus lower than bar.The vertical range B that 6 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 3 can be generally 1.1 times ~ 1.6 times of draft tube diameter, preferably 1.1 times ~ 1.2 times.The conical cylinder section opening diameter φ of urceolus 3 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 3 can be generally 1.3 times ~ 2 times of riser bar seam height.The direct tube section height K of urceolus 3 is 1.1 ~ 1.3 times of conical cylinder section height F.Under the conical cylinder section of urceolus 3, edge can be generally 5 ~ 100mm, preferably 20 ~ 50mm apart from the height C of tower tray 1.The taper angle theta of described urceolus conical cylinder section is generally 20 ~ 120 °, preferably 40 ~ 70 °.
As shown in Figure 3 and Figure 4: in deflector type demister of the present invention, the inner surface (inwall) of urceolus 3 can also have groove 7.Described groove 7 at the direct tube section of urceolus 3 and axis being parallel, or can form an angle with axis, and groove 7 forms an angle with the axis of the frustum of a cone in the part of urceolus 3 conical cylinder section, and angle is generally 5 ° ~ 45 °, preferably 10 ° ~ 25 °.The cross section of groove 7 can be rectangle, triangle or circular arc, is preferably triangle in the present invention.As shown in Figure 5, the cross section of groove 7 is triangle.Groove 7 is generally uniformly distributed on the inner surface of urceolus 3, its quantity on riser open bar seam 1.5 ~ 3 times of quantity.
Wherein the groove depth X of groove 7 can be generally 1 ~ 6mm, preferably 2 ~ 4mm; Separation Y can be generally 5 ~ 60mm, preferably 10 ~ 26mm; Groove angle β can be generally 5 ° ~ 20 °, preferably 8 ° ~ 16 °.
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.Not separated gas-liquid two-phase in succession afterflow moves, when running into urceolus 3, owing to there is airbond, gas flow direction changes again, and droplet is attached on the inwall of urceolus 3, coalescence is there is in shock urceolus 3 inwall process, urceolus 3 inwall has groove 7, is also more conducive to the coalescence of the drop on straight tube surface, can guide functions be played simultaneously, the drop of coalescence becomes large, and flows downward along barrel.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, aobvious water concentration <0.5g/Nm in demist final vacuum of the present invention
3, demisting efficiency >90%.
Claims (15)
1. a 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; Wherein said urceolus comprises the direct tube section on top and the conical cylinder section of bottom.
2., according to demister according to claim 1, it is characterized in that, the upper edge of described urceolus higher than the upper edge of riser, urceolus lower to distance tower tray certain distance.
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, the inner surface of described urceolus has some grooves, the part of groove at direct tube section and the axis being parallel of straight tube, or forms an angle with axis; Groove is in the part of urceolus conical cylinder section and the bus of the frustum of a cone is parallel or form an angle with bus, and consistent with the groove direction at direct tube section.
5. according to demister according to claim 4, it is characterized in that, the cross section of described groove is rectangle, triangle or circular arc.
6. according to demister according to claim 5, it is characterized in that, the cross section of described groove is triangle, and the groove depth X of groove is 1 ~ 6mm, preferably 2 ~ 4mm; Separation Y is 5 ~ 60mm, preferably 10 ~ 26mm; Groove angle β is 5 ° ~ 20 °, preferably 8 ° ~ 16 °.
7. want it to ask demister described in 1 according to right, it is characterized in that, the lower ending opening of described urceolus is arranged to zigzag structure.
8. according to demister according to claim 1, it is characterized in that, the tilting angle γ of the described tangential flow guiding wing is 5 ° ~ 45 °, preferably 10 ~ 30 °.
9. according to demister according to claim 1, it is characterized in that, it is consistent that quantity and the bar of the described tangential flow guiding wing stitch quantity, and the direction of rotation of the tangential flow guiding wing is consistent.
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 1, is characterized in that, described capping plate is connected with riser tube wall is airtight.
13., according to demister according to claim 1, is characterized in that, the taper angle theta of described urceolus conical section is 20 ~ 120 °, preferably 40 ~ 70 °.
14., according to demister according to claim 1, is characterized in that, the lower ending opening diameter phi of described urceolus is 1.2 times ~ 1.6 times of draft tube diameter, preferably 1.3 times ~ 1.4 times; The height H of described urceolus is 1.3 times ~ 2 times of riser bar seam height.
15., according to demister according to claim 1, is characterized in that, the quantity of described groove is 1.5 ~ 3 times of riser bar seam quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310540458.1A CN104606961B (en) | 2013-11-05 | 2013-11-05 | Deflector type demister |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310540458.1A CN104606961B (en) | 2013-11-05 | 2013-11-05 | Deflector type demister |
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| Publication Number | Publication Date |
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| CN104606961A true CN104606961A (en) | 2015-05-13 |
| CN104606961B CN104606961B (en) | 2017-10-03 |
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| CN201310540458.1A Active CN104606961B (en) | 2013-11-05 | 2013-11-05 | Deflector type demister |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107803068A (en) * | 2016-09-08 | 2018-03-16 | 中国石油化工股份有限公司 | A kind of high efficiency demister |
| CN108067044A (en) * | 2016-11-11 | 2018-05-25 | 中国石油化工股份有限公司抚顺石油化工研究院 | Defogging equipment |
| CN108067048A (en) * | 2016-11-11 | 2018-05-25 | 中国石油化工股份有限公司抚顺石油化工研究院 | A kind of bipyramid tubular demister |
| CN109806673A (en) * | 2019-03-06 | 2019-05-28 | 中国石油大学(北京) | A kind of gas-liquid separation device for gas defoaming |
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| CN200942317Y (en) * | 2006-05-19 | 2007-09-05 | 易应洪 | Spiral gas-liquid separator |
| 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 |
| CN203724894U (en) * | 2013-11-05 | 2014-07-23 | 中国石油化工股份有限公司 | Baffling demister |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200942317Y (en) * | 2006-05-19 | 2007-09-05 | 易应洪 | Spiral gas-liquid separator |
| 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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107803068A (en) * | 2016-09-08 | 2018-03-16 | 中国石油化工股份有限公司 | A kind of high efficiency demister |
| CN108067044A (en) * | 2016-11-11 | 2018-05-25 | 中国石油化工股份有限公司抚顺石油化工研究院 | Defogging equipment |
| CN108067048A (en) * | 2016-11-11 | 2018-05-25 | 中国石油化工股份有限公司抚顺石油化工研究院 | A kind of bipyramid tubular demister |
| CN108067048B (en) * | 2016-11-11 | 2020-09-11 | 中国石油化工股份有限公司抚顺石油化工研究院 | Double-cone cylindrical demister |
| CN109806673A (en) * | 2019-03-06 | 2019-05-28 | 中国石油大学(北京) | A kind of gas-liquid separation device for gas defoaming |
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| Publication number | Publication date |
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| CN104606961B (en) | 2017-10-03 |
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