CN108499230B - High-efficient rotary type defroster - Google Patents
High-efficient rotary type defroster Download PDFInfo
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- CN108499230B CN108499230B CN201710109525.2A CN201710109525A CN108499230B CN 108499230 B CN108499230 B CN 108499230B CN 201710109525 A CN201710109525 A CN 201710109525A CN 108499230 B CN108499230 B CN 108499230B
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- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000003595 mist Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 61
- 230000000694 effects Effects 0.000 abstract description 16
- 238000000926 separation method Methods 0.000 abstract description 14
- 239000012530 fluid Substances 0.000 abstract description 6
- 238000007790 scraping Methods 0.000 abstract description 5
- 230000001133 acceleration Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000012071 phase Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
-
- 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
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
The invention discloses a high-efficiency rotary demister. The demister comprises a plurality of demisting components, each demisting component comprises a gas riser and an outer barrel, the outer barrel is arranged on the outer side of the gas riser and is arranged on the same axis with the gas riser, helical fins are arranged on the inner surface of the outer barrel, the gas riser is divided into an upper part and a lower part along the axial direction, the upper part is a gas riser I, the lower part is a gas riser II, the gas riser I is connected with the gas riser II through a bearing, the gas riser II is fixed on a tower tray, and a rectifying channel is arranged on the circumference of the gas riser I. The demister realizes the separation of liquid drops and gas through the rectification, acceleration and scraping effect of fluid in the flowing process. The demister disclosed by the invention is simple in structure, convenient to install and not easy to scale, and can effectively realize gas-liquid separation and reduce entrainment.
Description
Technical Field
The invention relates to gas-liquid separation equipment, in particular to a high-efficiency rotary demister.
Background
Large amount of SO is generated in the production process of industries such as electric power, metallurgy, petrochemical industry and the like2And dust and other harmful substances, which bring serious acid rain hazard and haze weather, is the air pollutant which is currently controlled in China. At present, the wet desulphurization technology is generally adopted in the field of environmental protection to remove harmful substances such as sulfur dioxide in flue gas, namely, alkali liquor is sprayed on the flue gas to absorb or adsorb the harmful substances. However, in the wet desulfurization process, the absorption towerThe desulfurized flue gas contains a large amount of fine liquid drops with the particle size of about 10-60 microns, and sulfuric acid, sulfate and SO are dissolved in the liquid drops2And the like, not only can cause pollution to the atmospheric environment, but also can cause serious corrosion and scaling to subsequent equipment. Thus, when using a wet desulfurization process, the cleaned gas must be demisted prior to exiting the absorber tower, and the demisting step is accomplished by means of a demister.
The defroster generally sets up at the absorption tower top, and when the gas that contains the mist passes through the defroster with certain speed, can collide with defroster inner structure to attach on its surface. Mist on the surface of the inner structure of the demister can be gradually gathered under the action of diffusion and gravity, and after the weight reaches a certain level, the mist can be separated from the inner structure of the demister, so that gas-liquid separation is realized. When the demister causes resistance drop to increase to a preset value due to scaling in the operation process, a backwashing program needs to be started to wash the demister, generally, washing nozzles need to be arranged at the air inlet end and the air exhaust end of the demister, and the gas phase can be seriously carried to the liquid phase to cause liquid entrainment of the gas phase.
Common demisters include a wire mesh demister, a herringbone plate demister, a spiral-flow plate demister and the like. Although the wire mesh demister can separate common mist, the mist is required to be clean, the flow velocity of air flow is small, resistance is reduced greatly, the service cycle is short, and the equipment investment is large. The current demister is generally arranged horizontally, the gas flowing direction of the demister is perpendicular to a wire mesh, when the gas velocity is low, entrained mist is small in inertia, the mist waves in the gas and cannot be removed due to collision contact with the wire mesh, and the gas is easy to generate secondary entrainment to the liquid drops due to the fact that separated liquid drops and the gas phase are in a countercurrent flow direction, so that the gas-liquid separation efficiency is reduced, and the wire mesh demister also has the problems of easy blockage, large pressure drop and the like. The blade type and herringbone demister are internally provided with baffle plates with different directions and different shapes so as to form a small flow channel, increase the demisting effect, and have more complex structure and poor separation effect. The whirl plate defroster is the same with the gaseous flow direction by the separation liquid drop, easily produces the secondary and smugglies secretly, reduces defogging efficiency to the pressure drop is big, and the energy consumption is higher.
The demisting element introduced in CN200410014713.X consists of a baffle plate and a flue gas flow field adjusting block, wherein the baffle plate is fixed on the flue gas flow field adjusting block, and the density and the shape of the baffle plate are changed according to the change of flow field parameters at each position of a flow section, so that the flow section of airflow in an absorption tower is uniformly distributed, and the phenomenon of gas-liquid countercurrent in the drop falling process can not be avoided, namely secondary entrainment is easy to generate.
The defroster that CN200920128824.1 introduced comprises cooler, thick defroster and smart defroster etc. and thick defroster is wave plate or defogging board, and smart defroster is the wire net, and this defroster has changed the shortcoming that traditional defroster liquid droplet flows against the current with the air current direction, has improved defogging efficiency. But this defroster structure is more complicated, and the preparation is difficult, owing to adopted the wire mesh structure, the defroster pressure drop is great, also blocks up relatively easily.
CN203724892U introduces a straight cylindric baffling formula defroster comprises a plurality of defogging subassembly, and every defogging subassembly all includes gas-lift pipe and urceolus, and the circumference of gas-lift pipe is opened has a plurality of seams, is provided with slot and tangential water conservancy diversion wing on the gas-lift pipe circumference that is close to each seam, and the tangential water conservancy diversion wing plays the water conservancy diversion effect, makes the gas flow direction change. The separation of liquid drops and gas is realized through multiple baffling of fluid in the flowing process, the liquid drops with smaller particle size can be effectively removed, and the demisting efficiency is higher. However, after the gas flows through the tangential flow guide wings, the gas direction is still relatively divergent and not concentrated enough, the gas speed is reduced, and the impact force is smaller when the gas collides with the inner wall of the outer barrel, so that the demisting effect is influenced. This defroster mainly relies on the baffling to make gaseous direction change, thereby gaseous and solid wall bumps and realizes gas-liquid separation, and is better to great liquid drop defogging effect, nevertheless is not obvious to the droplet effect, and this defroster structure is more complicated, and the easy scale deposit in space between gas-lift pipe and the tangential water conservancy diversion wing.
US7618472B2 provides a vane type demister comprised of corrugated plates, flat plates, louvers, etc. and defining a plurality of cavities or channels. After the gas-liquid mixture enters the demister, the fluid flow channel is deviated, so that the flow direction of the fluid can be changed for a plurality of times, the speed change is very fast, and the liquid phase is easily separated from the gas phase. In the process of separating the liquid phase from the gas phase, the gas-liquid cross flow can be realized, so that the secondary entrainment effect of the gas phase on liquid drops is greatly reduced, but the technology has a very complicated structure, high processing difficulty and high corresponding processing and manufacturing cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-efficiency rotary demister, which realizes the separation of liquid drops and gas through rectification, acceleration and scraping effect of fluid in the flowing process. The demister disclosed by the invention has the advantages of simple structure, small pressure drop, difficulty in scaling and convenience in installation, reduces entrainment and can effectively realize gas-liquid separation.
The efficient rotary demister comprises a plurality of parallel demisting components, each demisting component comprises a gas lift pipe and an outer cylinder, the outer cylinder is arranged on the outer side of the gas lift pipe and preferably on the same axis with the gas lift pipe, and spiral fins are arranged on the inner wall of the outer cylinder; the gas lift pipe is divided into an upper part and a lower part along the axial direction, the upper part is a gas lift pipe I, the lower part is a gas lift pipe II, the gas lift pipe I is connected with the gas lift pipe II through a bearing, the top of the gas lift pipe I is provided with a sealing cover plate, and the gas lift pipe II is fixed on the tower tray; a plurality of rectifying channels are uniformly arranged on the circumference of the gas lift pipe I, the rectifying channels are horizontally embedded along the tangential direction of the outer wall of the gas lift pipe I, the side wall I of one side, close to the outer cylinder, of each rectifying channel is tangent to the pipe wall of the gas lift pipe I, the other side wall II of the rectifying channel is intersected with the pipe wall of the gas lift pipe I, and the rotating directions of the rectifying channels are the same; the top of the rectification channel is flush with the cover plate, and the bottom of the rectification channel is intersected with the tube wall of the gas lift tube I.
In the demister, the inner wall of the outer cylinder is provided with continuous spiral fins formed along a spiral line from bottom to top; the spiral line adopts a single-line or multi-line cylindrical thread line, the spiral angle of the spiral line is phi, and phi is 4-60 degrees; the cross section of each fin is preferably rectangular, the thickness of each spiral fin is smaller than that of the outer cylinder, and the width S of each fin is 10-800 mm, preferably 50-350 mm; the spiral fins can extend linearly along the spiral line direction or extend in a wave shape along the spiral line direction; the distance between every two adjacent circles of spiral fins in the axial direction is P, the distance P is 8-100 mm, preferably 10-40 mm, the distance between any two adjacent circles of spiral fins can be the same or different, and preferably the two adjacent circles of spiral fins are arranged at equal intervals; the outer edge (the side close to the gas lift pipe) of the spiral fin keeps a certain distance from the outer wall of the gas lift pipe, and the optimal distance is 20-60 mm.
In the demister of the present invention, the spiral direction of the spiral fin is the same as the rotation direction of the rectifying passage.
In the demister, the upper surface and the lower surface of the spiral fin are provided with a plurality of small bulges, and the height of each small bulge is 2-10 mm.
In the demister of the invention, the number of rectifying channels is generally 1 ~ 12, preferably 4-8, and the wall thickness of the rectifying channels is preferably the same as the wall thickness of the draft tube I.
In the demister, the length l of the rectifying channel is the length of the side wall II, the width w is the maximum horizontal distance between the two side walls of the rectifying channel, the height h is the maximum vertical distance between the top and the bottom of the rectifying channel, the length l is 2 ~ 5 times, preferably 3 ~ 4 times, the cross section of the rectifying channel is one or a combination of more of rectangle, ellipse, circle, trapezoid or semicircle, preferably one or a combination of more of rectangle, ellipse or circle, the size of the rectifying channel is determined by a person skilled in the art according to actual working conditions or design requirements, for example, the height h of the rectifying channel is generally 20-600 mm, preferably 100-300 mm, the width w of the rectifying channel is generally 10-200 mm, preferably 20-100 mm, the total cross section area of the rectifying channel is 0.2 ~ 0.9-0.9 times of the cross section area of the draft tube I, preferably 0.3 ~ 0.6-0.6 of the cross section area of the draft tube I.
In the demister, the tail end of the side wall II of the rectifying channel can be flush with the inner wall of the riser I or extend into the riser I for a certain distance m, wherein m is 0.1 ~ 0.9.9 times, preferably 0.3 ~ 0.6.6 times, of the length l, when the tail end of the side wall II of the rectifying channel is flush with the inner wall of the riser I, the tail end of the bottom of the rectifying channel is also flush with the inner wall of the riser I, and when the side wall II of the rectifying channel extends into the riser I for a certain distance m, the tail end of the bottom of the rectifying channel is flush with the tail end of the side wall.
In the demister, the bottom of the rectifying channel is away from the tower tray by a certain distance A, and the distance A is 60-300 mm, preferably 80-120 mm.
In the demister, the bottom of the bearing has a certain distance K with the tower tray, and the distance K is 20-200 mm, preferably 40-80 mm.
In the demister, the lower end of the riser II is flush with or lower than the tray for a certain distance and is hermetically connected with the tray, the height of the riser I is 1.1 ~ 3 times, preferably 1.5 ~ 2 times, the height of the rectifying channel, and the diameters of the riser I and the riser II and the aperture ratio of the tray can be determined by a person skilled in the art according to actual working conditions or design requirements.
In the demister, the rectifying channel, the cover plate and the gas lift pipe I can be welded together or integrally formed.
In the demister of the invention, the outer cylinder is preferably a cylinder, and the diameter D of the outer cylinder is 1.5 to 6 times, preferably 2 to 3 times, the diameter D of the draft tube. The upper edge of the outer barrel is higher than the upper edge of the gas lift pipe by a certain distance C, and the distance C is 1-8 times, preferably 2-5 times, of the height h of the rectifying channel. The lower edge of the outer cylinder is away from the tower tray by a certain distance B and is lower than the lower edge of the rectifying channel, and the distance B between the lower edge of the outer cylinder and the tower tray is 5-100 mm, preferably 20-50 mm. The total height H of the outer barrel is 2.5-10 times, preferably 3-5 times of the height of the rectifying channel.
In the demister, the lower end opening of the outer cylinder can be arranged into a zigzag or wavy structure, so that separated liquid is more favorably dripped from the inner wall of the outer cylinder into continuous flow.
The connection parts of the components of the demister are sealed, and the phenomenon of air leakage is avoided.
When the demister works, gas carrying liquid drops enters the riser II from the space at the lower part of the tray and then flows upwards to enter the riser I, the gas phase flow direction is changed after encountering the cover plate, namely the gas phase flow direction is changed from the ascending direction to the horizontal direction or the direction approximate to the horizontal direction, part of small liquid drops collide with the cover plate due to the inertia effect and are attached to the cover plate, the attached liquid drops gradually become larger, and when the gravity generated by the liquid drops is larger than the resultant force of the ascending force of the gas and the surface tension of the liquid, the liquid drops are separated from the surface of the cover plate, so that the first gas-liquid separation is completed. Because the rectifying channel has a certain length, and the total sectional area of the rectifying channel is smaller than the sectional area of the riser I, the velocity direction of the dispersed gas carrying liquid drops is changed into the direction along the rectifying channel after the gas enters the rectifying channel, the velocity direction is more regular and concentrated, and the velocity of the gas carrying liquid drops is increased after the gas enters the rectifying channel because the flow area is reduced. When the speed direction of the gas carrying the liquid drops is changed, part of the liquid drops collide with the inner wall of the rectifying channel and are attached to the inner wall of the rectifying channel, and then the gas flowing through the rectifying channel continuously blows out of the rectifying channel and falls down to complete secondary gas-liquid separation. Meanwhile, in the rectifying channel, because the speed and direction of the gas carrying the liquid drops are changed, part of the small liquid drops collide with each other under the action of inertia force, the small liquid drops are gathered into large liquid drops, and the speed of the gas carrying the liquid drops flowing through the rectifying channel is increased, so that the movement of the liquid drops is intensified, the probability of the mutual collision of the small liquid drops is improved, the small liquid drops are more easily gathered into the large liquid drops and flow out of the rectifying channel along with the gas at a higher speed. The gas which flows out from the rectifying channel and is carried with the liquid drops has higher speed, the speed direction is more concentrated, the carried liquid drops are larger, the gas continuously collides with the inner wall of the outer barrel, and the flowing direction of the gas is changed again, namely the gas carried with the liquid drops flows along the circumferential direction of the inner wall of the outer barrel instead of the rectifying channel. The rotating direction of the spiral fins arranged on the inner wall of the outer barrel is the same as the rotating direction of the rectifying channel, namely, the high-speed gas carrying liquid drops flows upwards along the rotation of the spiral fins on the inner wall of the outer barrel, and the gas carrying the liquid drops has higher speed, so that the large liquid drops are continuously thrown to the outer edge under the action of inertia force and flow downwards along the spiral fins; meanwhile, because the spiral fins are provided with a plurality of small bulges, the friction and the collision between the gas and the upper surface and the lower surface of the spiral fins are enhanced, so that small liquid drops are continuously gathered on the surfaces of the spiral fins and gradually enlarged, and then flow downwards along the spiral fins; and the gas continuously keeps flowing upwards along the inner wall of the outer barrel at a high speed, so that gas-liquid separation is realized for the third time, and entrainment is reduced. And when the gas carrying liquid drops flows out from the rectifying channel, the gas lift pipe I rotates through the connecting bearing under the pushing action of the gas, the rotating direction of the gas lift pipe I is opposite to the rotating direction of the rectifying channel, so that the gas flowing out of the rectifying channel continuously impacts all around the circumferential inner wall of the outer barrel, and only impacts the fixed position of the inner wall of the outer barrel, the scraping effect is enhanced, and meanwhile, the gas is more favorable for being uniformly distributed in the outer barrel. Through the rectification, acceleration and scraping effect, the liquid drops and the gas are separated in the flowing process of the fluid.
The demister is applied to an absorption tower adopting a wet desulphurization process, and generally the gas velocity entering a riser II is 3-20m/s, the gas velocity at the outlet of a rectifying channel is 10-40m/s, and the gas velocity at the outlet of the rectifying channel is 1.5 ~ 3 times of the gas velocity entering the riser II.
Compared with the prior art, the demister disclosed by the invention has the following advantages:
1. the gas lift pipe I is connected with the gas lift pipe II through a bearing, the gas lift pipe I rotates under the action of gas, the rotation direction of the gas lift pipe I is opposite to the rotation direction of the rectifying channel, so that the gas flowing out of the rectifying channel continuously impacts all around the circumferential inner wall of the outer barrel, and only impacts the fixed position of the inner wall of the outer barrel, the scraping effect is enhanced, and meanwhile, the gas is more favorably and uniformly distributed in the outer barrel.
2. The rectifying channel has a certain length, the original speed direction of the gas with dispersed liquid drops is changed into the direction along the rectifying channel after entering the rectifying channel, and the speed direction is regular and concentrated; and the total cross section area of the rectifying channel is smaller than the cross section area of the gas lift pipe I, and the velocity of the gas carrying with liquid drops after entering the rectifying channel is increased due to the reduction of the flow area.
3. The rotating direction of the spiral fins arranged on the inner wall of the outer barrel is the same as the rotating direction of the rectifying channel, high-speed gas carrying liquid drops flows upwards along the rotation of the spiral fins on the inner wall of the outer barrel, and large liquid drops are continuously thrown outwards under the action of inertia force and flow downwards along the spiral fins; meanwhile, because the spiral fins are provided with a plurality of small bulges, the friction and the collision between the gas and the upper surface and the lower surface of the spiral fins are enhanced, so that small liquid drops are continuously gathered on the surfaces of the spiral fins and gradually enlarged, and then flow downwards along the spiral fins; and the gas continues to flow upwards along the inner wall of the outer cylinder at a high speed.
4. Can reach the effect of defogging high-efficiently, the less liquid drop of particle diameter that smugglies secretly in the effective desorption gas, the defogging is efficient, has reduced the harm to the environment, has played the effect of environmental protection.
5. The gas flow is uniform, the flow resistance is small, and the resistance is reduced.
6. Simple structure, convenient manufacture, difficult blockage and scaling and no need of backwashing.
7. The water-saving effect is good, and the water removed from the gas carrying the liquid drops can be recycled, so that the water consumption is reduced.
Drawings
FIG. 1 is a schematic view of a demister of the present invention.
FIG. 2 is a schematic cross-sectional view of a rectification channel in a demister of the present invention.
FIG. 3 is a schematic cross-sectional view of another type of rectification channel in a demister of the present invention.
FIG. 4 is a schematic diagram of the structure of the outer cylinder of the demister and the spiral fins on the inner wall of the outer cylinder.
FIG. 5 is a circumferential cross-sectional view of the outer cylinder of the demister and the spiral fins on the inner wall of the outer cylinder.
Each of the labels in the figure is: 1-a tray; 2-draft tube II; 3-a bearing; 4-rectifying the channel; 5-outer cylinder; 6-riser I; 7-sealing the cover plate; 8-helical fins; 9-small bulge.
Detailed Description
The demister of the present invention will be described in further detail with reference to the accompanying drawings and examples.
The demister comprises a plurality of parallel demisting components, each demisting component comprises a gas lift pipe and an outer cylinder 5, the outer cylinder 5 is arranged on the outer side of the gas lift pipe, preferably on the same axis with the gas lift pipe, and the inner wall of the outer cylinder 5 is provided with helical fins 8; the gas lift tube is divided into an upper part and a lower part along the axial direction, the upper part is a gas lift tube I6, the lower part is a gas lift tube II2, the gas lift tube I6 is connected with the gas lift tube II2 through a bearing 3, the top of the gas lift tube I6 is provided with a sealing cover plate 7, and the gas lift tube II2 is fixed on the tray 1; a plurality of rectifying channels 4 are uniformly arranged on the circumference of the draft tube I6, the rectifying channels 4 are horizontally embedded along the tangential direction of the outer wall of the draft tube I6, the side wall I of one side, close to the outer cylinder 5, of each rectifying channel 4 is tangent to the tube wall of the draft tube I6, the other side wall II of the rectifying channel is intersected with the tube wall of the draft tube I6, and the rotating directions of the rectifying channels 4 are the same; the top of the rectifying channel 4 is flush with the cover plate 7, and the bottom of the rectifying channel intersects with the wall of the riser I6.
In the demister, the inner wall of the outer cylinder 5 is provided with continuous spiral fins 8 formed along a spiral line from bottom to top; the spiral line adopts a single-line or multi-line cylindrical thread line, the spiral angle of the spiral line is phi, and phi is 4-60 degrees; the cross section of each fin is preferably rectangular, the thickness of each spiral fin 8 is smaller than that of the outer cylinder 5, and the width S of each fin is 10-800 mm, preferably 50-350 mm; the helical fins 8 can extend linearly along the helical line direction or extend in a wave shape along the helical line direction; the distance between every two adjacent circles of helical fins 8 in the axial direction is P, the distance P is 8-100 mm, preferably 10-40 mm, and the distance between any two adjacent circles of helical fins 8 can be the same or different, preferably arranged at equal intervals; the outer edge (close to one side of the gas-lifting pipe) of the spiral fin 8 keeps a certain distance from the outer wall of the gas-lifting pipe, and the optimal distance is 20-60 mm.
In the demister of the present invention, the spiral fin 8 has the same direction of rotation as the rectifying passage 4.
In the demister, the upper surface and the lower surface of the spiral fin 8 are provided with a plurality of small bulges 9, and the height of each small bulge 9 is 2-10 mm.
In the demister of the invention, the rectifying channel 4 is generally provided with 1 ~ 12 pieces, preferably 4-8 pieces, and the wall thickness of the rectifying channel 4 is preferably the same as that of the riser I6.
In the demister, the length l of the rectifying channel 4 is the length of the side wall II, the width w is the maximum horizontal distance between the two side walls of the rectifying channel 4, the height h is the maximum vertical distance between the top and the bottom of the rectifying channel 4, the length l is 2 ~ 5 times, preferably 3 ~ 4 times, of the width w, the cross section of the rectifying channel 4 is one or a combination of more of a rectangle, an ellipse, a circle, a trapezoid or a semicircle, and the like, preferably one or a combination of more of a rectangle, an ellipse or a circle, the size of the rectifying channel 4 is determined by a person skilled in the art according to actual working conditions or design requirements, for example, the height h of the rectifying channel 4 is generally 20-600 mm, preferably 100-300 mm, the width w of the rectifying channel 4 is generally 10-200 mm, preferably 20-100 mm, the total cross section area of the rectifying channel 4 is 0.2 ~ 0.9.9 times of the cross section area of the draft tube I6, and preferably 0.3 ~ 0.6.6 times of the cross section area of the draft tube I6.
In the demister, the tail end of the side wall II of the rectifying channel 4 can be flush with the inner wall of the riser I6 or extend into the riser I6 for a certain distance m, wherein m is 0.1 ~ 0.9.9 times, preferably 0.3 ~ 0.6.6 times of the length l, when the tail end of the side wall II of the rectifying channel 4 is flush with the inner wall of the riser I6, the tail end of the bottom of the rectifying channel 4 is also flush with the inner wall of the riser I6, and when the side wall II of the rectifying channel 4 extends into the riser I6 for a certain distance m, the tail end of the bottom of the rectifying channel 4 is flush with the tail end of the side wall.
In the demister, the bottom of the rectifying channel 4 is away from the tower tray 1 by a certain distance A, and the distance A is 60-300 mm, preferably 80-120 mm.
In the demister, the bottom of the bearing 3 has a certain distance K with the tower tray 1, and the distance K is 20-200 mm, preferably 40-80 mm.
In the demister of the invention, the lower end of the riser II2 is flush with the tray 1 or is lower than the tray 1 for a certain distance and is hermetically connected with the tray 1, the height of the riser I6 is 1.1 ~ 3 times, preferably 1.5 ~ 2 times, the height of the rectifying channel 4, the diameters of the riser I6 and the riser II2 and the aperture ratio of the tray 1 can be determined by a person skilled in the art according to actual working conditions or design requirements.
In the demister of the invention, the rectifying channel 4, the cover plate 7 and the draft tube I6 can be welded together or integrally formed.
In the demister of the present invention, the outer cylinder 5 is preferably a cylinder, and the diameter D of the outer cylinder 5 is 1.5 to 6 times, preferably 2 to 3 times, the diameter D of the draft tube. The upper edge of the outer barrel 5 is higher than the upper edge of the gas lift pipe by a certain distance C, and the distance C is 1-8 times, preferably 2-5 times, of the height h of the rectifying channel 4. The lower edge of the outer cylinder 5 is away from the tower tray 1 by a certain distance B and is lower than the lower edge of the rectifying channel 4, and the distance B from the lower edge of the outer cylinder 5 to the tower tray 1 is 5-100 mm, preferably 20-50 mm. The total height H of the outer cylinder 5 is 2.5 to 10 times, preferably 3 to 5 times, the height of the rectifying passage 4.
Example one
150000Nm for purifying flue gas in certain wet scrubber3The apparent water concentration is 10-15 g/Nm3After demisting by the present invention, the concentration of the apparent water in the exhaust gas<0.5g/Nm3And the demisting efficiency is more than or equal to 95 percent.
Example two
100000Nm for purifying flue gas in wet washing tower3The apparent water concentration is 12-16 g/Nm3After demisting by the present invention, the concentration of the apparent water in the exhaust gas<0.6g/Nm3And the demisting efficiency is more than or equal to 95 percent.
Claims (13)
1. The utility model provides a high-efficient rotary type defroster includes a plurality of defogging subassembly that stands side by side, and every defogging subassembly all includes gas lift pipe and urceolus, its characterized in that: the outer cylinder is arranged on the outer side of the gas lift pipe, and the inner wall of the outer cylinder is provided with helical fins; the gas lift pipe is divided into an upper part and a lower part along the axial direction, the upper part is a gas lift pipe I, the lower part is a gas lift pipe II, the gas lift pipe I is connected with the gas lift pipe II through a bearing, the top of the gas lift pipe I is provided with a sealing cover plate, and the gas lift pipe II is fixed on the tower tray; a plurality of rectifying channels are uniformly arranged on the circumference of the gas lift pipe I, the rectifying channels are horizontally embedded along the tangential direction of the outer wall of the gas lift pipe I, the side wall I of one side, close to the outer cylinder, of each rectifying channel is tangent to the pipe wall of the gas lift pipe I, the other side wall II of the rectifying channel is intersected with the pipe wall of the gas lift pipe I, and the rotating directions of the rectifying channels are the same; the top of the rectification channel is flush with the cover plate, and the bottom of the rectification channel is intersected with the tube wall of the gas lift tube I; the inner wall of the outer barrel is provided with continuous spiral fins formed along a spiral line from bottom to top; the spiral line adopts a single-line or multi-line cylindrical thread line, the spiral angle of the spiral line is phi, and phi is 4-60 degrees; the distance between every two adjacent circles of spiral fins in the axial direction is P, and the distance P is 8-100 mm; the upper surface and the lower surface of the spiral fin are provided with a plurality of small bulges, and the height of each small bulge is 2-10 mm.
2. A demister as set forth in claim 1 wherein: the section of the spiral fin is rectangular, and the width S of the spiral fin is 10-800 mm; the helical fins can extend linearly along the helical line direction or extend in a wave shape along the helical line direction.
3. A demister as set forth in claim 1 wherein: the distance between two adjacent circles of helical fins is arranged at equal intervals.
4. A demister as set forth in claim 1 wherein: the rotation direction of the spiral fins is the same as the rotation direction of the rectifying channel.
5. A demister as set forth in claim 1, wherein 1 ~ 12 of said rectifying passages are provided.
6. A demister according to claim 1, wherein the length l of the rectifying channel is the length of the side wall II, the width w is the maximum horizontal distance between the two side walls of the rectifying channel, the height h is the maximum vertical distance between the top and the bottom of the rectifying channel, wherein the length l is 2 ~ 5 times the width w, and the cross-sectional shape of the rectifying channel is one or a combination of a plurality of rectangular, oval, circular, trapezoidal or semicircular.
7. A demister as set forth in claim 1, wherein the total cross-sectional area of the rectifying passage is 0.2 ~ 0.9.9 times the cross-sectional area of the draft tube I.
8. A demister as set forth in claim 1, wherein the end of the side wall II of the rectifying channel is flush with the inner wall of the draft tube I or extends into the draft tube I by a distance m, m being 0.1 ~ 0.9.9 times the length l.
9. A demister as set forth in claim 1 wherein: the bottom of the rectifying channel is away from the tower tray by a certain distance A, and the distance A is 60-300 mm.
10. A demister as set forth in claim 1 wherein: the bottom of the bearing is at a certain distance K from the tower tray, and the distance K is 20-200 mm.
11. The demister according to claim 1, wherein the lower end of the riser II is flush with or below the tray at a certain distance and is hermetically connected with the tray, and the height of the riser I is 1.1 ~ 3 times the height of the rectifying channel.
12. A demister as set forth in claim 1 wherein: the outer cylinder is a cylinder, and the diameter D of the outer cylinder is 1.5-6 times of the diameter D of the riser; the upper edge of the outer cylinder is higher than the upper edge of the gas rising pipe by a certain distance C, and the distance C is 1-8 times of the height h of the rectifying channel; the lower edge of the outer cylinder is away from the tower tray by a certain distance B and is lower than the lower edge of the rectifying channel, the distance B between the lower edge of the outer cylinder and the tower tray is 5-100 mm, and the total height H of the outer cylinder is 2.5-10 times of the height of the rectifying channel.
13. The use of a mist eliminator as claimed in claim 1 in an absorber column for a wet desulphurization process, wherein the gas velocity entering the riser is 3-20m/s, the gas velocity at the outlet of the rectifying channel is 10-40m/s, and the gas velocity at the outlet of the rectifying channel is 1.5 ~ 3 times the gas velocity entering the riser.
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| CN201710109525.2A CN108499230B (en) | 2017-02-27 | 2017-02-27 | High-efficient rotary type defroster |
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| CN201710109525.2A CN108499230B (en) | 2017-02-27 | 2017-02-27 | High-efficient rotary type defroster |
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| CN111068412B (en) * | 2018-10-18 | 2025-02-14 | 郝占宁 | A spiral demisting and dehumidifying device |
| CN113368608B (en) * | 2021-06-17 | 2022-04-15 | 承德石油高等专科学校 | Gas-liquid separator for oil field |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003039755A1 (en) * | 2001-11-07 | 2003-05-15 | Consept As | Axial demisting cyclone |
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| CN102350112B (en) * | 2011-08-30 | 2013-12-11 | 成都易态科技有限公司 | Cross filtration filter element assembly |
| CN102872655B (en) * | 2012-09-21 | 2014-12-03 | 兰州节能环保工程有限责任公司 | Gas-liquid separating device |
| CN202893008U (en) * | 2012-11-08 | 2013-04-24 | 淮北矿山机器制造有限公司 | Tangential material-distributing device of peripheral driving thickener |
| CN203724893U (en) * | 2013-11-05 | 2014-07-23 | 中国石油化工股份有限公司 | Straight cylindrical baffling 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 |
| CN203990103U (en) * | 2014-07-22 | 2014-12-10 | 北京化工大学 | A kind of fume desulfurizing tower chimney |
| CN204769200U (en) * | 2015-06-02 | 2015-11-18 | 江阴市江中设备制造有限公司 | Vapour and liquid separator of setting in concentrated jar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2003039755A1 (en) * | 2001-11-07 | 2003-05-15 | Consept As | Axial demisting cyclone |
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Effective date of registration: 20230829 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: Sinopec (Dalian) Petrochemical Research Institute Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Patentee before: DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC Corp. |