CN108067045B - Defogging equipment - Google Patents
Defogging equipment Download PDFInfo
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- CN108067045B CN108067045B CN201610990959.3A CN201610990959A CN108067045B CN 108067045 B CN108067045 B CN 108067045B CN 201610990959 A CN201610990959 A CN 201610990959A CN 108067045 B CN108067045 B CN 108067045B
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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
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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
- B01D45/12—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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Abstract
The invention discloses demisting equipment which comprises a plurality of parallel demisting assemblies, wherein each demisting assembly comprises a gas lift pipe and an outer cylinder, and the outer cylinder is arranged on the outer side of the gas lift pipe; the gas lift pipe is axially divided into an upper part and a lower part, the upper part is a gas lift pipe I, the top part is provided with an upper sealing cover plate, the lower part is a gas lift pipe II, the bottom part is provided with a lower sealing cover plate, and the gas lift pipe I is connected with the gas lift pipe II through a bearing; a plurality of air outlet rectifying channels are uniformly arranged on the circumference of the air lift pipe I, and the air outlet rectifying channels are horizontally embedded along the tangential direction of the outer wall of the air lift pipe I; the gas lift pipe II is fixed on the tower tray, the bottom of the gas lift pipe II is lower than the tower tray for a certain distance, a plurality of gas inlet rectifying channels are uniformly arranged on the circumference of the part below the tower tray of the gas lift pipe II, and the gas inlet rectifying channels are horizontally embedded along the tangential direction of the outer wall of the gas lift pipe II. The demisting device disclosed by the invention is simple in structure, small in pressure drop, not easy to scale, convenient to install, capable of reducing entrainment and capable of effectively realizing gas-liquid separation.
Description
Technical Field
The invention relates to a gas-liquid separation device, in particular to a demisting device.
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 flue gas desulfurized by the absorption tower 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 drops2Etc. not only will cause to the atmospheric environmentCausing pollution and causing serious corrosion and scaling on 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 a demisting device which realizes the separation of liquid drops and gas through the rectification, acceleration and scraping effects of fluid in the flowing process. The demisting device disclosed by the invention is simple in structure, small in pressure drop, not easy to scale, convenient to install, capable of reducing entrainment and capable of effectively realizing gas-liquid separation.
The defogging device comprises a plurality of parallel defogging components, each defogging component comprises a gas lift pipe and an outer cylinder, and the outer cylinder is arranged outside the gas lift pipe and preferably on the same axis with the gas lift pipe; the gas lift pipe is axially divided into an upper part and a lower part, the upper part is a gas lift pipe I, the top part is provided with an upper sealing cover plate, the lower part is a gas lift pipe II, the bottom part is provided with a lower sealing cover plate, and the gas lift pipe I is connected with the gas lift pipe II through a bearing; a plurality of air outlet rectifying channels are uniformly arranged on the circumference of the air lift pipe I, the air outlet rectifying channels are horizontally embedded along the tangential direction of the outer wall of the air lift pipe I, the side wall I of one side, close to the outer barrel, of the air outlet rectifying channel is tangent to the pipe wall of the air lift pipe I, the other side wall II of the air outlet rectifying channel is intersected with the pipe wall of the air lift pipe I, the top of the air outlet rectifying channel is flush with the upper cover plate, the bottom of the air outlet rectifying channel is intersected with the pipe wall; the gas lift pipe II is fixed on the tower tray, the bottom of the gas lift pipe II is lower than the tower tray by a certain distance, a plurality of gas inlet rectifying channels are uniformly arranged on the circumference of the part below the tower tray of the gas lift pipe II, the gas inlet rectifying channels are horizontally embedded along the tangential direction of the outer wall of the gas lift pipe II, the side wall I of the gas inlet rectifying channel close to one side of the outer cylinder is tangent to the pipe wall of the gas lift pipe II, the other side wall II is intersected with the pipe wall of the gas lift pipe II, the bottom of the gas inlet rectifying channel is flush with the lower sealing cover plate, the top of the gas inlet rectifying channel is intersected with the pipe.
In the defogging device, the number of the outlet rectification channels is generally 1-12, preferably 4-8. The wall thickness of the outlet rectifying channel is preferably the same as the wall thickness of the draft tube I.
In the demisting device, the length l of the air outlet rectification channel is the length of the side wall II, the width w is the maximum horizontal distance between the two side walls of the air outlet rectification channel, and the height h is the maximum vertical distance between the top and the bottom of the air outlet rectification channel; wherein the length l is 2-5 times, preferably 3-4 times of the width w; the section of the air outlet rectification channel is in one or more combinations of a rectangle, an ellipse, a circle, a trapezoid or a semicircle, and the like, and preferably in one or more combinations of a rectangle, an ellipse or a circle. The size of the air outlet rectification channel is determined by a person skilled in the art according to actual working conditions or design requirements, and if the height h of the air outlet rectification channel is generally 20-600 mm, preferably 100-300 mm; the width w of the air outlet rectification channel is generally 10-200 mm, preferably 20-100 mm. The total cross section area of the air outlet rectification channel is 0.2-0.9 times of the cross section area of the air lifting pipe I, and preferably 0.3-0.6 times of the cross section area of the air lifting pipe I.
In the defogging device, the tail end of the side wall II of the air outlet rectification channel can be flush with the inner wall of the air lifting pipe I or extend into the air lifting pipe I for a certain distance m, wherein m is 0.1-0.9 times of the length l, and preferably 0.3-0.6 times. When the tail end of the side wall II of the air outlet rectifying channel is flush with the inner wall of the air lift pipe I, the tail end of the bottom of the air outlet rectifying channel is also flush with the inner wall of the air lift pipe I; when the side wall II of the air outlet rectifying channel extends into the interior of the air lifting pipe I for a certain distance m, the tail end of the bottom of the air outlet rectifying channel is flush with the tail end of the side wall.
In the defogging device, 1-12 air inlet rectification channels are generally arranged, and 2-6 air inlet rectification channels are preferably arranged. The wall thickness of the inlet straightening channel is preferably the same as the wall thickness of the draft tube II.
In the demisting device, the length e of the air inlet rectifying channel is the length of the side wall II, the width f is the maximum horizontal distance between the two side walls of the air inlet rectifying channel, and the height g is the maximum vertical distance between the top and the bottom of the air inlet rectifying channel; wherein the length e is 1-3 times, preferably 1.2-2 times of the width f; the cross section of the air inlet rectifying channel is in one or a combination of more than one of rectangle, ellipse, circle, trapezoid or semicircle, preferably in one or a combination of more than one of rectangle, ellipse or circle, more preferably in rectangle; the total sectional area of the air inlet rectification channel is 0.6-1.5 times, preferably 0.8-1.2 times of that of the gas lift pipe II. The size of the air inlet rectification channel is determined by a person skilled in the art according to the actual working condition or design requirement, and if the height g of the air inlet rectification channel is generally 20-200 mm, preferably 50-100 mm; the width f of the air inlet rectification channel is generally 10-100 mm, preferably 20-80 mm. The tail end of the side wall II of the air inlet rectification channel is flush with the inner wall of the gas lift pipe II.
In the demisting device, the top of the air inlet rectifying channel is lower than the tower tray by a certain distance, the bottom of the air inlet rectifying channel (the bottom of the riser II) is away from the tower tray by a certain distance K, and the distance K is 1.1-3 times, preferably 1.5-2 times, of the height of the air inlet rectifying channel.
In the demister of the present invention, the number of inlet rectifier channels is preferably less than or equal to the number of outlet rectifier channels.
In the demisting device, the bottom of the air outlet rectification channel is away from the tower tray by a certain distance A, wherein the distance A is 60-300 mm, and preferably 80-120 mm.
In the demisting device, the bottom of the bearing is away from the tower tray by a certain distance C, wherein the distance C is 20-200 mm, and preferably 40-80 mm.
In the demisting device, the gas lift pipe II is hermetically connected with the tower tray, and the height of the gas lift pipe I is 1.1-3 times, preferably 1.5-2 times, of the height of the rectifying channel. The diameters of the risers I and II and the opening ratio of the tray can be determined by those skilled in the art according to actual working conditions or design requirements.
In the demisting device, the air inlet rectifying channel, the lower cover plate and the gas lift pipe II can be welded together or integrally formed, and the air outlet rectifying channel, the upper cover plate and the gas lift pipe I can be welded together or integrally formed.
In the defogging device, the outer cylinder is a cylinder, and the diameter D of the outer cylinder is 1.5 to 6 times, preferably 2 to 3 times of the diameter D of the draft tube II. The upper edge of the outer cylinder is higher than the upper edge of the gas lift pipe I by a certain distance P, and the distance P is 1-8 times, preferably 2-5 times, of the height h of the gas outlet rectification 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 air outlet rectification 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 air outlet rectification channel.
In the defogging device of the invention, the inner surface of the outer cylinder is provided with a groove and/or a bulge. The protrusions or grooves are parallel to the axis of the outer barrel or may be at an angle to the axis. The cross section of the groove or the bulge can also be in a proper shape such as a rectangle, a triangle or a circle.
In the defogging device, the inner surface of the outer cylinder is preferably provided with a groove with a cross section shape as shown in figure 5, the cross section of the groove is composed of an arc and a straight line segment, wherein the intersection points of the arc and the inner surface circumference of the outer cylinder are respectively made into tangent lines of the arc and the circumference, the included angle between the tangent lines is α degrees to 70 degrees, preferably 10 degrees to 40 degrees, the included angle between the tangent line of the arc and the straight line segment at the intersection point of the arc and the straight line segment is β degrees to 110 degrees, preferably 45 degrees to 90 degrees, the depth Z of the groove is 0.1 to 0.7 times, preferably 0.3 to 0.5 times of the wall thickness of the outer cylinder, and the arc length between the intersection point of the arc and the inner surface circumference of the outer cylinder and the intersection point of the inner surface circumference of the outer cylinder is 1/80 to 1/6 times of the inner surface circumference of the outer cylinder.
In the defogging device of the invention, the lower end opening of the outer cylinder can be arranged into a zigzag or wavy structure, thereby being more beneficial to the separated liquid to drip from the inner wall of the outer cylinder in a continuous flow.
The connection parts of the components of the defogging device are sealed, and the phenomenon of air leakage is avoided.
When the gas droplet enters the rectifying channel along the tangential direction, the liquid droplet flows along the rectifying channel, the rectifying direction of the gas droplet is changed from the rectifying channel inner wall to the rectifying channel inner wall, the liquid droplet is separated from the rectifying channel inner wall, the first gas-liquid separation is completed, the other part of the larger liquid droplet flows along the gas, the liquid droplet flows along the gas riser I inner wall disc, the gas droplet flowing direction of the gas droplet is changed from the gas flow direction of the gas droplet, the second gas droplet separation is completed, the gas droplet is changed from the gas flow direction of the gas phase after the gas phase flows along the upper cover plate, the second gas droplet is separated from the upper cover plate, the liquid droplet is changed into the larger liquid droplet, the gas droplet flows along the rectifying channel inner wall of the rectifying channel inner wall, the rectifying channel inner wall of the rectifying.
The demisting device is applied to the absorption tower adopting the wet desulphurization process, the gas velocity entering the riser II is 3-20m/s, the gas velocity at the outlet of the gas outlet rectifying channel is 10-40m/s, and the gas velocity at the outlet of the gas outlet rectifying channel is 1.5-3 times of the gas velocity entering the riser II.
Compared with the prior art, the demisting device has the following advantages:
1. the lower end of the gas lift pipe II is provided with a lower sealing cover plate, the circumferential direction of the gas lift pipe II is uniformly provided with a plurality of gas inlet rectifying channels, so that gas directly enters the gas lift pipe II along the tangential direction, the cyclone effect is strengthened, the first gas-liquid separation is completed in the process, meanwhile, a part of gathered larger liquid drops continuously flow along with the gas, and the liquid drops rotate to flow upwards along the inner wall discs of the gas lift pipe II and the gas lift pipe I.
2. The gas outlet rectifying channel is arranged on the outer barrel, and the gas outlet rectifying channel is arranged on the gas outlet rectifying channel.
3. The section of the groove on the inner surface of the cylinder is composed of an arc and a straight line segment, when the high-speed gas carrying the liquid drops rotates and flows upwards along the inner wall of the outer cylinder, the liquid drops are continuously thrown outwards under the action of inertia force, the liquid drops enter the groove and move along the arc segment in the groove, and the included angle α is 5-70 degrees, so that the liquid drops can continuously move smoothly along the arc surface of the groove until the liquid drops flow downwards along the inner wall of the outer cylinder after being blocked by the straight line segment, and no dead zone exists.
4. Through multistage defogging, reach the effect of defogging high-efficiently, the less liquid drop of particle diameter smuggleing 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 structural diagram of a defogging device of the present invention.
Fig. 2 is a schematic cross-sectional view of an intake rectifying passage.
Fig. 3 is a schematic cross-sectional view of a demisting apparatus with the outlet rectification channel flush with the inner wall.
Fig. 4 is a schematic cross-sectional view of a demister with an outlet flow straightener extending into the interior of the draft tube I.
FIG. 5 is a schematic view of a groove having a circular arc and a straight line segment in cross section.
Each of the labels in the figure is: 1-a tray; 2-a riser I; 3-an air outlet rectification channel; 4-outer cylinder; 5, sealing the cover plate; 6-groove; 7-an air inlet rectification channel; 8-lower sealing cover plate; 9-a bearing; 10-riser II.
Detailed Description
The demister of the present invention will be described in further detail with reference to the accompanying drawings and examples.
The defogging device comprises a plurality of parallel defogging components, each defogging component comprises a gas lift pipe and an outer barrel 4, and the outer barrel 4 is arranged outside the gas lift pipe and preferably on the same axis with the gas lift pipe; 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 I2, the top part is provided with an upper sealing cover plate 5, the lower part is a gas lift pipe II10, the bottom part is provided with a lower sealing cover plate 8, and the gas lift pipe I2 is connected with the gas lift pipe II10 through a bearing 9; a plurality of air outlet rectifying channels 3 are uniformly arranged on the circumference of the air lift pipe I2, the air outlet rectifying channels 3 are horizontally embedded along the tangential direction of the outer wall of the air lift pipe I2, the side wall I of one side, close to the outer cylinder 4, of the air outlet rectifying channel 3 is tangent to the pipe wall of the air lift pipe I2, the other side wall II of the air outlet rectifying channel is intersected with the pipe wall of the air lift pipe I2, the top of each air outlet rectifying channel 3 is flush with the upper sealing cover plate 5, the bottom of each air outlet rectifying channel is intersected with the pipe wall of the; the air lift pipe II10 is fixed on the tray 1, a plurality of air inlet rectifying channels 7 are uniformly arranged on the circumference of the air lift pipe II10, the air inlet rectifying channels 7 are horizontally embedded along the tangential direction of the outer wall of the air lift pipe II10, the side wall I of one side, close to the outer barrel 4, of the air inlet rectifying channel 7 is tangent to the pipe wall of the air lift pipe II10, the other side wall II is intersected with the pipe wall of the air lift pipe II10, the bottom of the air inlet rectifying channel 7 is flush with the lower cover plate 8, the top of the air inlet rectifying channel is intersected with the pipe wall of the air lift pipe II10, and the rotating direction of.
In the defogging device, the number of the outlet rectification channels 3 is generally 1-12, preferably 4-8. The wall thickness of the outlet rectifying channel 3 is preferably the same as the wall thickness of the draft tube I2.
In the demisting device, the length l of the air outlet rectification channel 3 is the length of the side wall II, the width w is the maximum horizontal distance between the two side walls of the air outlet rectification channel 3, and the height h is the maximum vertical distance between the top and the bottom of the air outlet rectification channel 3; wherein the length l is 2-5 times, preferably 3-4 times of the width w; the cross section of the air outlet rectification channel 3 is in one or a combination of several of rectangle, ellipse, circle, trapezoid or semicircle, and preferably in one or a combination of several of rectangle, ellipse or circle. The size of the air outlet rectification channel 3 is determined by a person skilled in the art according to actual working conditions or design requirements, and if the height h of the air outlet rectification channel 3 is generally 20-600 mm, preferably 100-300 mm; the width w of the air outlet rectification channel 3 is generally 10-200 mm, preferably 20-100 mm. The total cross-sectional area of the air outlet rectification channel 3 is 0.2-0.9 times of the cross-sectional area of the draft tube I2, and preferably 0.3-0.6 times of the cross-sectional area of the draft tube I2.
In the defogging device, the tail end of the side wall II of the air outlet rectification channel 3 can be flush with the inner wall of the air lifting pipe I2 or extend into the air lifting pipe I2 for a certain distance m, wherein m is 0.1-0.9 times of the length l, and preferably 0.3-0.6 times. When the tail end of the side wall II of the air outlet rectifying channel 3 is flush with the inner wall of the air rising pipe I2, the tail end of the bottom of the air outlet rectifying channel 3 is also flush with the inner wall of the air rising pipe I2; when the side wall II of the air outlet rectifying channel 3 extends into the air rising pipe I2 for a certain distance m, the bottom end of the air outlet rectifying channel 3 is flush with the end of the side wall.
In the defogging device, 1-12 air inlet rectification channels 7 are generally arranged, and 2-6 air inlet rectification channels are preferably arranged. The wall thickness of the inlet rectifying passage 7 is preferably the same as that of the draft tube II 10.
In the demisting device, the length e of the air inlet rectifying channel 7 is the length of the side wall II, the width f is the maximum horizontal distance between the two side walls of the air inlet rectifying channel 7, and the height g is the maximum vertical distance between the top and the bottom of the air inlet rectifying channel 7; wherein the length e is 1-3 times, preferably 1.2-2 times of the width f; the cross section of the air inlet rectifying channel 7 is in one or more combinations of a rectangle, an ellipse, a circle, a trapezoid or a semicircle, and the like, and preferably in one or more combinations of a rectangle, an ellipse or a circle; the total sectional area of the air inlet rectification channel is 0.6-1.5 times, preferably 0.8-1.2 times of that of the gas lift pipe II. The size of the air inlet rectifying channel 7 is determined by a person skilled in the art according to actual working conditions or design requirements, and if the height g of the air inlet rectifying channel 7 is generally 20-200 mm, preferably 50-100 mm; the width f of the air inlet rectification channel 7 is generally 10-100 mm, preferably 20-80 mm. The end of the side wall II of the air inlet rectifying channel 7 is flush with the inner wall of the air lifting pipe II 10.
In the demisting device, the top of the air inlet rectifying channel 7 is lower than the tower tray 1 by a certain distance, the bottom of the air inlet rectifying channel 7 is away from the tower tray 1 by a certain distance K, and the distance K is 1.1-3 times, preferably 1.5-2 times, of the height of the air inlet rectifying channel 7.
In the demister of the invention, the number of inlet fairing passages 7 is preferably less than or equal to the number of outlet fairing passages 3.
In the demisting device, the bottom of the air outlet rectification channel 3 is away from the tower tray 1 by a certain distance A, wherein the distance A is 60-300 mm, and preferably 80-120 mm.
In the demisting device, the bottom of the bearing 9 is away from the tower tray 1 by a certain distance C, wherein the distance C is 20-200 mm, and preferably 40-80 mm.
In the demisting device, the riser II10 is hermetically connected with the tray 1, and the height of the riser I2 is 1.1-3 times, preferably 1.5-2 times, of the height of the rectifying channel. The diameters of risers I2 and II10 and the opening of tray 1 can be determined by one skilled in the art according to actual conditions or design requirements.
In the defogging device of the invention, the air inlet rectifying channel 7, the lower cover plate 8 and the air lift pipe II10 can be welded together or integrally formed, and the air outlet rectifying channel 3, the upper cover plate 5 and the air lift pipe I2 can be welded together or integrally formed.
In the defogging device of the invention, the outer cylinder 4 is a cylinder, and the diameter D of the outer cylinder 4 is 1.5 to 6 times, preferably 2 to 3 times of the diameter D of the draft tube II 10. The upper edge of the outer cylinder 4 is higher than the upper edge of the gas lift pipe I2 by a certain distance P, and the distance P is 1-8 times, preferably 2-5 times, of the height h of the gas outlet rectification channel 3. The lower edge of the outer cylinder 4 is away from the tower tray 1 by a certain distance B and is lower than the lower edge of the air outlet rectification channel 3, and the distance B between the lower edge of the outer cylinder 4 and the tower tray 1 is 5-100 mm, preferably 20-50 mm. The total height H of the outer cylinder 4 is 2.5 to 10 times, preferably 3 to 5 times, the height of the air outlet rectification channel 3.
In the defogging device of the invention, the inner surface of the outer cylinder 4 is provided with the groove 6 and/or the bulge. The projections or recesses 6 are parallel to the axis of the outer barrel 4 or may be at an angle to the axis. The cross section of the groove 6 or the bulge can also be in a suitable shape such as a rectangle, a triangle or a circle.
In the defogging device, the inner surface of the outer cylinder 4 is preferably provided with the groove 6 with the cross section shape shown in FIG. 5, the cross section of the groove 6 is composed of an arc and a straight line segment, wherein the intersection points of the arc and the inner surface circumference of the outer cylinder 4 are respectively tangent lines of the arc and the circumference, the included angle between the tangent lines is α degrees to 70 degrees, preferably 10 degrees to 40 degrees, the included angle between the tangent line of the arc and the straight line segment at the intersection point of the arc and the straight line segment is β degrees to 110 degrees, preferably 45 degrees to 90 degrees, the depth Z of the groove 6 is 0.1 to 0.7 times, preferably 0.3 to 0.5 times of the wall thickness of the outer cylinder 4, and the arc length between the intersection point of the arc and the inner surface circumference of the outer cylinder 4 and the intersection point of the straight line segment and the inner surface circumference of the outer cylinder 4 is 1/80 to 1/6 times of the inner surface circumference of the outer cylinder.
In the defogging device of the present invention, the lower opening of the outer cylinder 4 can be set into a zigzag or wavy structure, so as to be more favorable for the separated liquid to drip continuously from the inner wall of the outer cylinder 4.
The connection parts of the components of the defogging device are sealed, and the phenomenon of air leakage is avoided.
When the demisting device works, gas carrying liquid drops directly enters the riser II10 along the tangential direction from the gas inlet rectifying channel 7 at the lower end of the tray 1, part of the liquid drops collide with the inner wall of the gas inlet rectifying channel 7 to enable some small liquid drops to be attached and converged on the inner wall of the gas inlet rectifying channel 7, the attached liquid drops gradually increase, when gravity generated by a part of the larger liquid drops exceeds the resultant force of rising force of gas and liquid surface tension, the liquid drops fall and are separated along the surface of the gas inlet rectifying channel 7, the first gas-liquid separation is completed, the other part of the larger liquid drops continuously flow along the gas, the liquid drops continuously flow along the inner wall disc of the riser II10 and the inner wall of the riser I2, when the gas carrying liquid drops rises in the riser I2, the gas phase flow direction changes after encountering the upper capping plate 5, part of the small liquid drops collide with the upper capping plate 5, the second gas-liquid separation is completed, part of the discharged gas droplets are converged into larger liquid drops and continue to flow along the horizontal direction or approximately horizontal direction, the entrained gas, the entrained liquid drops, the entrained gas flows along the riser I, the inner wall of the rectifying channel, the rectifying channel 3, the rectifying channel is formed by the rectifying channel 3, the rectifying channel is formed by the rectifying channel, the rectifying channel is formed by the rectifying channel 3, the rectifying channel 3, the rectifying channel is more gas channel, the rectifying channel is more entrained liquid drops, the rectifying channel is more entrained liquid drops, the rectifying channel is more the rectifying channel, the rectifying channel is more rectifying channel, the rectifying channel I rectifying channel, the rectifying channel I.
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 (18)
1. A defogging device, comprising: the device comprises a plurality of parallel defogging components, wherein each defogging component comprises a gas lift pipe and an outer cylinder, and the outer cylinder is arranged on the outer side of the gas lift pipe; the gas lift pipe is axially divided into an upper part and a lower part, the upper part is a gas lift pipe I, the top part is provided with an upper sealing cover plate, the lower part is a gas lift pipe II, the bottom part is provided with a lower sealing cover plate, and the gas lift pipe I is connected with the gas lift pipe II through a bearing; a plurality of air outlet rectifying channels are uniformly arranged on the circumference of the air lift pipe I, the air outlet rectifying channels are horizontally embedded along the tangential direction of the outer wall of the air lift pipe I, the side wall I of one side, close to the outer barrel, of the air outlet rectifying channel is tangent to the pipe wall of the air lift pipe I, the other side wall II of the air outlet rectifying channel is intersected with the pipe wall of the air lift pipe I, the top of the air outlet rectifying channel is flush with the upper cover plate, the bottom of the air outlet rectifying channel is intersected with the pipe wall; the gas lift pipe II is fixed on the tower tray, the bottom of the gas lift pipe II is lower than the tower tray by a certain distance, a plurality of gas inlet rectifying channels are uniformly arranged on the circumference of the part below the tower tray of the gas lift pipe II, the gas inlet rectifying channels are horizontally embedded along the tangential direction of the outer wall of the gas lift pipe II, the side wall I of the gas inlet rectifying channel close to one side of the outer cylinder is tangent to the pipe wall of the gas lift pipe II, the other side wall II is intersected with the pipe wall of the gas lift pipe II, the bottom of the gas inlet rectifying channel is flush with the lower sealing cover plate, the top of the gas inlet rectifying channel is intersected with the pipe.
2. A defogging device as recited in claim 1 wherein: 4-8 air outlet rectification channels are arranged.
3. A defogging device as recited in claim 1 wherein: the length l of the air outlet rectification channel is 2-5 times of the width w; the section of the air outlet rectification channel is in one or a combination of a plurality of shapes of rectangle, ellipse, circle, trapezoid or semicircle.
4. A defogging device as recited in claim 1 wherein: the total cross-sectional area of the air outlet rectification channel is 0.2-0.9 times of the cross-sectional area of the air lifting pipe I.
5. A defogging device as recited in claim 1 wherein: the tail end of the side wall II of the air outlet rectification channel is flush with the inner wall of the air lifting pipe I or extends into the air lifting pipe I for a certain distance m, and m is 0.1-0.9 time of the length l.
6. A defogging device as recited in claim 1 or claim 5 wherein: when the tail end of the side wall II of the air outlet rectifying channel is flush with the inner wall of the air lift pipe I, the tail end of the bottom of the air outlet rectifying channel is also flush with the inner wall of the air lift pipe I; when the side wall II of the air outlet rectifying channel extends into the interior of the air lifting pipe I for a certain distance m, the tail end of the bottom of the air outlet rectifying channel is flush with the tail end of the side wall.
7. A defogging device as recited in claim 1 wherein: the number of the air inlet rectifying channels is 2-6.
8. A defogging device as recited in claim 1 wherein: the length e of the air inlet rectification channel is 1-3 times of the width f; the cross section of the air inlet rectifying channel is in one or a combination of a plurality of shapes of rectangle, ellipse, circle, trapezoid or semicircle.
9. A defogging device as recited in claim 1 wherein: the total sectional area of the air inlet rectification channel is 0.6-1.5 times of the sectional area of the gas lift pipe II.
10. A defogging device as recited in claim 1 wherein: the top of the air inlet rectifying channel is lower than the tower tray by a distance, the bottom of the air inlet rectifying channel is away from the tower tray by a certain distance K, and the distance K is 1.1-3 times of the height of the air inlet rectifying channel.
11. A defogging device as recited in claim 1 wherein: the number of inlet rectifying channels is less than or equal to the number of outlet rectifying channels.
12. A defogging device as recited in claim 1 wherein: the bottom of the air outlet rectification channel is away from the tower tray by a certain distance A, and the distance A is 60-300 mm.
13. A defogging device as recited in claim 1 wherein: the bottom of the bearing is away from the tower tray by a certain distance C, and the distance C is 20-200 mm.
14. A defogging device as recited in claim 1 wherein: the height of the air lift pipe I is 1.1-3 times of the height of the rectifying channel.
15. A defogging device as recited 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 draft tube II; the upper edge of the outer cylinder is higher than the upper edge of the gas rising pipe I by a certain distance P, and the distance P is 1-8 times of the height h of the gas outlet rectification 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 air outlet rectification channel, and the distance B from the lower edge of the outer cylinder to the tower tray is 5-100 mm; the total height H of the outer barrel is 2.5-10 times of the height of the air outlet rectification channel.
16. A defogging device as recited in claim 1 wherein: the inner surface of the outer cylinder is provided with grooves and/or bulges.
17. The defogging device according to claim 16, wherein the cross section of the groove formed on the inner surface of the outer cylinder is composed of an arc and a straight line segment, wherein the intersection points of the arc and the circumference of the inner surface of the outer cylinder are respectively made into tangent lines of the arc and the circumference, the included angle between the tangent lines is α degrees to 70 degrees, the included angle between the tangent line of the arc and the straight line segment at the intersection point of the arc and the straight line segment is β degrees, the depth Z of the groove is 0.1 to 0.7 times of the wall thickness of the outer cylinder, and the arc length between the intersection point of the arc and the circumference of the inner surface of the outer cylinder and the intersection point of the straight line segment and the circumference of the inner surface of the outer cylinder is 1/80 to 1/6 degrees.
18. Use of a demister as defined in any one of claims 1 to 17 in an absorber tower of a wet desulphurization process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610990959.3A CN108067045B (en) | 2016-11-11 | 2016-11-11 | Defogging equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610990959.3A CN108067045B (en) | 2016-11-11 | 2016-11-11 | Defogging equipment |
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| CN108067045B true CN108067045B (en) | 2020-02-14 |
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| CN102125895A (en) * | 2011-01-11 | 2011-07-20 | 于晓林 | Cyclone |
| CN102872655A (en) * | 2012-09-21 | 2013-01-16 | 兰州节能环保工程有限责任公司 | Gas-liquid separating device |
| 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 |
| 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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| US20030221558A1 (en) * | 2002-03-26 | 2003-12-04 | Lister Roy D. | Apparatus and method for separation of gases |
| EP1413359A1 (en) * | 2002-10-22 | 2004-04-28 | Voith Paper Patent GmbH | Process and apparatus for separating heavy materials from a fibrous suspension |
| CN202808742U (en) * | 2012-10-29 | 2013-03-20 | 中国石油天然气集团公司 | Spiral-flow type natural gas dehydration device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102125895A (en) * | 2011-01-11 | 2011-07-20 | 于晓林 | Cyclone |
| CN102872655A (en) * | 2012-09-21 | 2013-01-16 | 兰州节能环保工程有限责任公司 | Gas-liquid separating device |
| 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 |
| 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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