CN203724892U - Straight cylindrical baffling demister - Google Patents

Straight cylindrical baffling demister Download PDF

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Publication number
CN203724892U
CN203724892U CN201320691925.6U CN201320691925U CN203724892U CN 203724892 U CN203724892 U CN 203724892U CN 201320691925 U CN201320691925 U CN 201320691925U CN 203724892 U CN203724892 U CN 203724892U
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CN
China
Prior art keywords
demister
riser
straight tube
edge
gas
Prior art date
Application number
CN201320691925.6U
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Chinese (zh)
Inventor
方向晨
彭德强
王璐瑶
王岩
陈建兵
孟凡飞
陈新
孟凡忠
Original Assignee
中国石油化工股份有限公司
中国石油化工股份有限公司抚顺石油化工研究院
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Priority to CN201320691925.6U priority Critical patent/CN203724892U/en
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Publication of CN203724892U publication Critical patent/CN203724892U/en

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Abstract

The utility model discloses a straight cylindrical baffling demister. The demister comprises a plurality of demisting assemblies, wherein each demisting assembly comprises a riser and a straight cylinder; the straight 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 straight cylindrical 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

A kind of straight tube shape deflector type demister
Technical field
The present invention relates to a kind of straight tube shape deflector type 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.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of straight tube shape deflector type demister, the baffling by fluid in flow process is realized the separated of drop and gas.A kind of straight tube shape deflector type 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 straight tube shape deflector type demister, described demister comprises the demist assembly that several are arranged side by side, and each demist assembly includes riser and straight tube, and straight tube 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 straight tube is higher than the upper edge of riser, and the lower edge of straight tube is apart from tower tray certain distance.
In baffling demister of the present invention, on the inner surface of described straight tube, can also offer groove.Described groove is parallel with the axis of straight tube, or can form an angle with axis.The cross section of the described groove of offering can be rectangle, triangle or circular arc, is preferably triangle in the present invention.
Wherein, the lower ending opening of described straight tube can also be arranged to zigzag structure, thereby be more conducive to isolated liquid, from the inwall of straight tube, becomes Continuous Flow drippage.
In deflector type demister of the present invention, the gas of entrained drip rises and enters in several demisters on tower tray bottom.First gas will enter riser, in uphill process, because the diameter of riser is less, gas speed is improved, gas is carried liquid phase secretly and is risen, and riser upper end arranges capping plate, meets after capping plate gas flow direction change (changing level or level of approximation direction into by ascent direction), and the droplet of carrying secretly is because effect of inertia and capping plate bump, and be attached on capping plate.The drop adhering to gradually coalescence becomes large, and when drop increases to making a concerted effort of climbing power that the gravity himself producing surpasses gas and surface tension of liquid, drop is just separated from sealing lid surface to get off, and has completed 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, make gas occur again to flow to change, 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 in succession afterflow is moving, when running into straight tube, due to airbond occurring, gas flow direction changes again, still unsegregated droplet is attached on the inwall of straight tube, in clashing into the inwall process of straight tube, there is coalescence, make drop become large, and along the barrel of straight tube toward current downflow.Drop is when flowing downward, and under the blowing of gas, drop hurtles down, and realizes gas-liquid separation.
Compared with prior art, straight tube shape deflector type demister of the present invention has the following advantages:
1, can effectively remove the drop that particle diameter is less, 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, on straight tube inwall, offer groove, when the gas that the bar from riser stitches out brushes groove, meet with airbond, can effectively suppress or eliminate the cyclonic action of gas; Meanwhile, the speed of brushing the gas of groove significantly reduces, and the drop of carrying secretly in gas will be separated and be attached on inwall from gas, and accelerates coalescence along groove, and down becomes Continuous Flow drippage along groove, thereby has further reduced entrainment.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of straight tube shape deflector type demister of the present invention.
Fig. 2 is the riser in Fig. 1, the A-A schematic cross-section of the tangential flow guiding wing.
Fig. 3 is the another kind of structural representation of straight tube shape deflector type demister of the present invention.
Fig. 4 is the riser in Fig. 3, the A-A schematic cross-section of the tangential flow guiding wing.
Fig. 5 offers the sectional view of groove in Fig. 3.
In Fig. 1-4: 1-tower tray; 2-riser; 3-straight tube; The 4-tangential flow guiding wing; 5-capping plate; 6-bar seam; 7-groove.
The specific embodiment
Below in conjunction with drawings and Examples, straight tube shape deflector type demister of the present invention is described in further detail.
Straight tube shape deflector type demister of the present invention comprises the demist assembly that several are arranged side by side.As depicted in figs. 1 and 2, each demist assembly comprises riser 2 and straight tube 3, and straight tube 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 6, 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 bar seam height h; 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 α of tangential flow guiding wing perk angle 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 straight tube 3 is higher than capping plate 4, and the lower edge of straight tube 3 is apart from tower tray 1 certain distance.Straight tube shape 3 is arranged on the outside of riser, and coaxial with riser.The general θ of taper angle of straight tube is 20~120 °, preferably 40~70 °.The lower edge of straight tube should be lower than the lower edge of bar seam.Vertical range B along edge under riser bar seam under straight tube can be generally 20~260mm, preferably 50~80mm.Straight tube 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 straight tube can be generally 1.3 times~2 times of riser bar seam height.Under straight tube, along the height C apart from tower tray, 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 straight tube 3, can also offer groove 7.Groove 7 is parallel with the axis of straight tube 3, or can form an angle with axis, 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 straight tube, and its quantity is 1.5~3 times of riser bar seam 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 generally can be 5~20 °, preferably 8~16 °.
In deflector type demister of the present invention, the lower ending opening of described straight tube 3 can also be arranged to zigzag structure, thereby be more conducive to isolated liquid, from the inwall of straight tube, 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 just 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, the droplet not being removed is captured through identical effect at the tangential flow guiding wing 4 turnings, completes another gas-liquid separator.Not separated gas-liquid two-phase in succession afterflow is moving, while running into straight tube 3, owing to there is airbond, gas flow direction changes again, and droplet is attached on the inwall of straight tube 3, in clashing into straight tube 3 inwall processes, there is coalescence, on straight tube 3 inwalls, have groove 7, be also more conducive to the coalescence of the lip-deep drop of straight tube, can play guide functions simultaneously, it is large that the drop of coalescence becomes, and flow downward along barrel.Drop when flowing downward,, under the blowing of gas, drop hurtles down, and 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 (21)

1. a straight tube shape deflector type demister, is characterized in that, described demister comprises the demist assembly that several are arranged side by side, each demist assembly riser and straight tube, straight tube is arranged on the outside of riser, and with riser on same axis; Riser is fixed on tower tray, 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, the quantity of the tangential flow guiding wing is consistent with bar seam quantity, and the direction of rotation of the tangential flow guiding wing is consistent.
2. according to demister claimed in claim 1, it is characterized in that, the upper edge of described straight tube is higher than the upper edge of riser.
3. according to demister claimed in claim 1, it is characterized in that, the inwall of described straight tube has groove, and described groove is parallel with the axis of straight tube, or forms an angle with axis.
4. according to demister claimed in claim 3, it is characterized in that, the cross section of described groove is rectangle, triangle or circular arc.
5. according to demister claimed in claim 1, it is characterized in that, the lower edge of described straight tube is apart from tower tray certain distance.
6. according to demister claimed in claim 1, it is characterized in that, the lower ending opening of described straight tube is arranged to zigzag structure.
7. according to demister claimed in claim 1, it is characterized in that, the height h of bar that riser leaves seam is 20~500mm; The width L of bar seam is 20~120mm.
8. according to demister claimed in claim 1, it is characterized in that, the area that always cracks of described bar seam is 3~5 times of riser sectional area.
9. according to demister claimed in claim 3, it is characterized in that, the quantity of described groove is 1.5~3 times of riser bar seam quantity.
10. 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 °.
11. according to demister claimed in claim 1, it is characterized in that, described capping plate is connected with riser tube wall is airtight.
12. according to demister claimed in claim 1, it is characterized in that, the lower edge of described straight tube is lower than the lower edge of bar seam.
13. according to the demister described in claim 12, it is characterized in that, the lower edge of described straight tube is 20~260mm apart from the vertical range B on the lower edge of riser bar seam.
14. according to demister claimed in claim 1, it is characterized in that, the diameter phi of described straight tube is draft tube diameter 1.1 times~1.6 times.
15. according to demister claimed in claim 1, it is characterized in that, the height H of described straight tube is 1.3 times~2 times of bar that riser leaves seam height.
16. according to demister claimed in claim 1, it is characterized in that, the lower edge of described straight tube is 5~100mm apart from the height C of tower tray.
17. according to demister claimed in claim 7, it is characterized in that, the height h of bar that riser leaves seam is 200~350mm; The width L of bar seam is 50~80mm.
18. according to demister claimed in claim 10, it is characterized in that, the perk angle [alpha] of the described tangential flow guiding wing is 15 °~30 °.
19. according to the demister described in claim 13, it is characterized in that, the lower edge of described straight tube is 50~80mm apart from the vertical range B on the lower edge of riser bar seam.
20. according to the demister described in claim 14, it is characterized in that, the diameter phi of described straight tube is draft tube diameter 1.1 times~1.2 times.
21. according to the demister described in claim 16, it is characterized in that, the lower edge of described straight tube is 20~50mm apart from the height C of tower tray.
CN201320691925.6U 2013-11-05 2013-11-05 Straight cylindrical baffling demister CN203724892U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104606963A (en) * 2013-11-05 2015-05-13 中国石油化工股份有限公司 Straight cylinder-shaped flow baffling type demister
CN108067043A (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 multi-stage demister
CN108067046A (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 High efficiency demister
CN108067050A (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 high-efficiency multi-stage demister
CN108067047A (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 efficient defogging equipment
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
CN108067042A (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 cone barrel demister
CN108692323A (en) * 2017-04-12 2018-10-23 中国石油化工股份有限公司 A kind of chimney structure
CN108692324A (en) * 2017-04-12 2018-10-23 中国石油化工股份有限公司 A kind of eliminating white smoke chimney
CN108692322A (en) * 2017-04-12 2018-10-23 中国石油化工股份有限公司 A kind of chimney

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104606963A (en) * 2013-11-05 2015-05-13 中国石油化工股份有限公司 Straight cylinder-shaped flow baffling type demister
CN104606963B (en) * 2013-11-05 2017-06-06 中国石油化工股份有限公司 A kind of straight tube shape deflector type demister
CN108067043A (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 multi-stage demister
CN108067046A (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 High efficiency demister
CN108067050A (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 high-efficiency multi-stage demister
CN108067047A (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 efficient defogging equipment
CN108067042A (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 cone barrel 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
CN108067047B (en) * 2016-11-11 2020-08-11 中国石油化工股份有限公司抚顺石油化工研究院 High-efficient defogging equipment
CN108692323A (en) * 2017-04-12 2018-10-23 中国石油化工股份有限公司 A kind of chimney structure
CN108692324A (en) * 2017-04-12 2018-10-23 中国石油化工股份有限公司 A kind of eliminating white smoke chimney
CN108692322A (en) * 2017-04-12 2018-10-23 中国石油化工股份有限公司 A kind of chimney
CN108692322B (en) * 2017-04-12 2020-07-07 中国石油化工股份有限公司 Chimney

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