CN203724891U - Inverted conical baffling demister - Google Patents

Inverted conical baffling demister Download PDF

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Publication number
CN203724891U
CN203724891U CN201320691928.XU CN201320691928U CN203724891U CN 203724891 U CN203724891 U CN 203724891U CN 201320691928 U CN201320691928 U CN 201320691928U CN 203724891 U CN203724891 U CN 203724891U
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CN
China
Prior art keywords
demister
riser
conical drum
inversed conical
gas
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Expired - Lifetime
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CN201320691928.XU
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Chinese (zh)
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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Abstract

The utility model discloses an inverted conical baffling demister. The demister comprises a plurality of demisting assemblies, wherein each demisting assembly comprises a riser and an inverted conical cylinder; the inverted conical cylinder is arranged at the outer side of the riser and is located on the same axis with the riser; the riser is fixed on a column tray, the top of the riser is provided with a sealing cover plate, the circumference of the riser is provided with a plurality of seams, and the circumference close to all the seams of the riser is provided with tangential guide vanes. According to the inverted conical baffling demister disclosed by the utility model, the liquid drop and gas separation can be realized through baffling a liquid many times in a flowing process. The demister disclosed by the utility model is simple in structure, convenient to mount, capable of effectively realizing gas-liquid separation, and suitable for a gas-liquid separation process in the fields such as chemical industry, environment friendliness 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 fields such as chemical industry and environmental protection.
Background technology
SO 2with dust be the major reason that causes China's atmosphere pollution, the atmosphere pollution of the current priority control of Ye Shi China.At present, at field of Environment Protection, mostly adopt wet processing, in wet processing flue gas desulfurization course, absorption tower, in running, easily produces particle diameter and is " mist " of 10~60 microns, not only contains moisture, is also dissolved with sulfuric acid, sulfate, SO 2deng, atmospheric environment is polluted, aiutage and heat exchanger etc. is caused to more serious corrosion simultaneously.Therefore,, in wet desulfurizing process, Purge gas must demist before leaving absorption tower.
Demister is that the fields such as chemical industry or environmental protection are for the treatment facility of gas-liquid separation.When the gas that contains mist passes through demister with certain speed, meeting and demister internal structure bump against, and depend in its surface.The lip-deep mist of demister internal structure, progressively assembles through the effect meeting of diffusion and gravity, when weight reaches after certain level, will separate from demister internal structure.Thereby realize gas-liquid separation.Demister operated by rotary motion is at top, absorption tower.When demister causes resistance drop to increase to predetermined value because of fouling in running, just need to start backwashing procedures demister is rinsed, general, at demister inlet end and exhaust end, all need to arrange flooding nozzle.Now may cause gas phase to seriously the carrying secretly of liquid phase, cause gas phase band liquid.
According to the purposes of demister, structure, can be divided into many types, as mesh mist eliminator, collapser demister, rotational flow plate defroster, electrostatic precipitator, venetian blind type demister and gravitational settling type demister etc.Conventional have mesh mist eliminator, collapser demister, a rotational flow plate defroster etc.Although mesh mist eliminator can 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.Demister generally all adopts horizontally disposed at present, demister gas flow direction is vertical with silk screen, when gas speed is lower, the mist inertia of carrying secretly is little, in gas, drifts, can not contact and be removed with silk screen collision, and flow to because separated drop and gas phase are adverse current, gas easily produces reentrainment to drop, thereby makes gas-liquid separation Efficiency Decreasing, and the problems such as mesh mist eliminator also exists easy obstruction, and Pressure Drop is large.Blade type, herringbone demister inside are provided with the deflection plate that direction is different, shape is different, to form little runner, increase except fog effect, and 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, reduce demist efficiency, and pressure drop is large, and energy consumption is higher.
The demister element that patent CN200410014713.X introduces is comprised of deflection plate and flue gas flow field adjustment block, deflection plate is fixed in flue gas flow field adjustment block, the variation of flow field parameter everywhere changes according to flow area for the density of deflection plate and shape, thereby the flow area of air-flow in absorption tower is evenly distributed.Still do not break away from drop landing process, gas-liquid counter current phenomenon, easily produces reentrainment.The demister that patent CN200920128824.1 introduces consists of cooler, thick demister and smart demister etc., thick demister is corrugated sheet or demist plate, essence demister is steel wire, this demister has changed the shortcoming of traditional demister drop and airflow direction counter-current flow, has improved demist efficiency, but this demister structure is more complicated, make difficulty, and owing to having adopted screen net structure, demister pressure drop is larger, also than being easier to, stop up.
The rotational flow plate defroster that patent CN200720038084.3 introduces is consisted of blade, blind plate, cover cylinder and ring flat-plate, this demister mainly utilizes blade to promote gas and is rotated, 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 larger, energy consumption is higher.
US Patent No. 7618472B2 provides a kind of vane-type demister, and this demister consists of corrugated sheet, flat board and louver board etc., and forms a lot of cavitys or runner.Gas-liquid mixture enters after demister, and fluid course is offset, and makes direction of flow be able to change for several times, and velocity variations is very fast, and liquid phase is easy to from gas phase separation out.This technology liquid phase, in gas phase separation process, can realize gas liquid cross-flow, so gas phase reduces greatly to the reentrainment effect of drop, but this technical pattern is very complicated, and difficulty of processing is also larger, and corresponding processing and fabricating expense is higher.
Utility model content
For the deficiencies in the prior art, the invention provides a kind of demister, the repeatedly baffling by fluid in flow process is realized the separated of drop and gas.Demister of the present invention is simple in structure, and pressure drop is little, easy for installation, can effectively realize gas-liquid separation.
The invention provides a kind of back taper deflector type demister, described demister comprises the demist assembly that several are 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 same axis; Riser is fixed on tower tray, and the top of riser arranges capping plate, at the circumference of riser, has some seams, near on the riser circumference of each seam, is being provided with the tangential flow guiding wing.
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 the lower edge of inversed conical drum is apart from 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, it is the clapper structure of rectangle that described projection preferably adopts cross section.Wherein, the direction of rotation of hyoplastron is identical or contrary with the direction of rotation of the tangential flow guiding wing, preferably adopts contrary direction of rotation.
Wherein, the lower ending opening of described inversed conical drum can also be arranged to zigzag structure, thereby be more conducive to isolated liquid, from the inwall of inversed conical drum, becomes Continuous Flow drippage.
In deflector type demister of the present invention, wherein at the inwall of inversed conical drum, can also further offer groove, the cross section of groove can be the suitable shape such as triangle, circular arc or rectangle.Described groove can with bulge clearance setting.
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, meet after capping plate gas phase flow direction change (changing level or level of approximation direction into by ascent direction), and droplet is because effect of inertia and capping plate bump, and be attached on capping plate, it is large that the drop adhering to becomes gradually, drop arrive greatly climbing power that the gravity himself producing surpasses gas and surface tension of liquid with joint efforts time, drop is just separated envelope lid surface to get off, completed 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 not being removed is captured through identical effect at tangential flow guiding wing turning, completes another gas-liquid separation.Not separated gas-liquid two-phase continues to flow, because inversed conical drum inwall is provided with hyoplastron, while 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 is assembled change, crack along hyoplastron and barrel flows down, and has accelerated coalescence, has reduced 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, and realizes gas-liquid separation.
Compared with prior art, back taper deflector type demister of the present invention has the following advantages:
1, can effectively remove the less drop of particle diameter of carrying secretly in gas, demist efficiency is high.The capping plate on riser top and the tangential flow guiding wing make to carry secretly the gas phase generation baffling of droplet, realize gas-liquid separation.
2, the diameter due to inversed conical drum lower end diminishes, and the gas speed flowing downward is improved, and gas phase is blown droplets fall, has accelerated gas-liquid separation process.
3, projection is set on inversed conical drum inwall the hyoplastron contrary with tangential flow guiding wing direction of rotation is especially set, when the gas that the bar from riser stitches out brushes projection, meet with airbond, can effectively suppress or eliminate the cyclonic action of gas; Simultaneously, brushing projection significantly reduces with the speed of the gas of back taper barrel crack, the drop of carrying secretly in gas will be separated and be attached on inwall from gas, and the crack forming along projection and inversed conical drum accelerates coalescence, and down become Continuous Flow drippage along crack, thereby further reduced 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.
In figure, be respectively labeled as: 1-tower tray; 2-riser; 3-inversed conical drum; The 4-tangential flow guiding wing; 5-capping plate; 6-projection; 7-bar seam.
The specific embodiment
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 same axis; Riser 2 is fixed on tower tray 1, and the top of riser arranges capping plate 5, at the circumference of riser, has some seams 7, near on the riser circumference of each seam, is being provided with the tangential flow guiding wing 4.
On riser tube wall, offer the size of bar seam, can need or design requirement according to actual operating mode, by those skilled in the art, determined.As described in can be 20~500mm, preferably 200~350mm the height h of bar seam; 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 with bar the position that is connected 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] of tangential flow guiding wing perk 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 the lower edge of inversed conical drum 3 is apart from 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 be lower than the lower edge of bar seam.Vertical range B along edge under riser bar seam under inversed conical drum 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, along the height C apart from tower tray 1, can be generally 5~100mm, preferably 20~50mm.
As shown in Figure 3 and Figure 4: in deflector type demister of the present invention, on the inner surface (inwall) of inversed conical drum 3, can also arrange some protruding 6.Projection is 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 projection 6 can be rectangle, triangle or circular arc, is preferably rectangle in the present invention, and projection is preferably hyoplastron.As in Fig. 3, projection 6 is clapper structure.Projection 6 is 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 or contrary with the direction of rotation of the tangential flow guiding wing 4, preferably contrary with the direction of rotation of the tangential flow guiding wing.
Wherein, when projection 6 is hyoplastron, the angle γ of its perk 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, thereby be more conducive to isolated liquid, from the inwall of inversed conical drum, becomes Continuous Flow drippage.
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, meeting capping plate 5 rear gas phase flow directions changes, and droplet is because effect of inertia and capping plate 5 bump, and be attached on capping plate, the drop adhering to becomes greatly gradually, drop arrive greatly climbing power that the gravity himself producing surpasses gas and surface tension of liquid with joint efforts time, drop drips from capping plate 5 surfaces, has completed a gas-liquid separation.The line of rabbet joint that not separated gas-liquid two-phase is offered from riser 2 tops flows out, under the guide functions of the tangential flow guiding wing 4, the mobile direction of gas-liquid two-phase is changed again, and the droplet not being removed is captured at the tangential flow guiding wing 4 turnings, completes another gas-liquid separator.Separated gas-liquid two-phase does not continue to flow yet, when running into inversed conical drum 3, because inversed conical drum 3 inwalls are provided with projection (hyoplastron), there is airbond while running into the projection (hyoplastron) on inversed conical drum 3 inwalls 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 is assembled change, along projection (hyoplastron 6) and the crack of barrel, flow down, accelerated coalescence, reduced 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, and finally 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, demist efficiency >90%.

Claims (25)

1. a back taper deflector type demister, is characterized in that, described demister comprises the demist assembly that several are 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 same axis; Riser is fixed on tower tray, and the top of riser arranges capping plate, at the circumference of riser, has some seams, near on the riser circumference of each seam, is being provided with the tangential flow guiding wing; Inwall at 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 claimed in 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 claimed in claim 3, it is characterized in that, the perk angle γ of described hyoplastron is 5 °~45 °.
5. according to demister claimed in claim 1, it is characterized in that, the perk angle [alpha] of the described tangential flow guiding wing is 5 °~45 °.
6. according to demister claimed in claim 1, 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 claimed in 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 claimed in claim 1, it is characterized in that, the lower edge of described inversed conical drum is 5~100mm apart from the height C of tower tray.
9. according to demister claimed in 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 claimed in claim 1, it is characterized in that, on riser the height h of the bar of opening seam be 20~500mm; The width L of bar seam is 20~120mm.
11. according to demister claimed in claim 1, it is characterized in that, the gross area of described bar seam is 3~5 times of riser sectional area.
12. according to demister claimed in claim 10, it 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 claimed in claim 1, it is characterized in that, described capping plate is connected with riser tube wall is airtight.
14. according to demister claimed in claim 1, it is characterized in that, the taper angle theta of described inversed conical drum is 20~120 °.
15. according to demister claimed in claim 1, it is characterized in that, the lower edge of described inversed conical drum is lower than the lower edge of bar seam.
16. according to the demister described in claim 15, it is characterized in that, the lower edge of described inversed conical drum is 20~260mm apart from the vertical range B on the lower edge of riser bar seam.
17. according to demister claimed in claim 1, it is characterized in that, the lower end diameter φ of described inversed conical drum is draft tube diameter 1.1 times~1.6 times; The height H of described inversed conical drum is 1.3 times~2 times of riser bar seam height.
18. according to demister claimed in claim 8, it is characterized in that, the lower edge of described inversed conical drum is 20~50mm apart from the height C of tower tray.
19. according to demister claimed in claim 1, it is characterized in that, at the inwall of inversed conical drum, also has groove, described groove and bulge clearance setting.
20. according to demister claimed in claim 4, it is characterized in that, the perk angle γ of described hyoplastron is 10 °~30 °.
21. according to demister claimed in claim 5, it is characterized in that, the perk angle [alpha] of the described tangential flow guiding wing is 15 °~30 °.
22. according to demister claimed in claim 10, it is characterized in that, on riser the height h of the bar of opening seam be 200~350mm; The width L of bar seam is 50~80mm.
23. according to the demister described in claim 14, it is characterized in that, the taper angle theta of described inversed conical drum is 40~70 °.
24. according to the demister described in claim 16, it is characterized in that, the lower edge of described inversed conical drum is 50~80mm apart from the vertical range B on the lower edge of riser bar seam.
25. according to the demister described in claim 17, it is characterized in that, the lower end diameter φ of described inversed conical drum is draft tube diameter 1.1 times~1.2 times.
CN201320691928.XU 2013-11-05 2013-11-05 Inverted conical baffling demister Expired - Lifetime CN203724891U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN201320691928.XU CN203724891U (en) 2013-11-05 2013-11-05 Inverted conical baffling demister

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104606959A (en) * 2013-11-05 2015-05-13 中国石油化工股份有限公司 Inverted cone-shaped flow baffling demister

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104606959A (en) * 2013-11-05 2015-05-13 中国石油化工股份有限公司 Inverted cone-shaped flow baffling demister
CN104606959B (en) * 2013-11-05 2017-01-18 中国石油化工股份有限公司 Inverted cone-shaped flow baffling demister

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Granted publication date: 20140723