CN108067041B - High-efficient defogging equipment - Google Patents
High-efficient defogging equipment Download PDFInfo
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- CN108067041B CN108067041B CN201610990945.1A CN201610990945A CN108067041B CN 108067041 B CN108067041 B CN 108067041B CN 201610990945 A CN201610990945 A CN 201610990945A CN 108067041 B CN108067041 B CN 108067041B
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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
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
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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
- B01D45/06—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
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- 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
Abstract
The invention discloses high-efficiency 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 air lift pipe is axially divided into an upper part and a lower part, the upper part is an air lift pipe I, the lower part is an air lift pipe II, and the air lift pipe I is connected with the air lift pipe II through a bearing; rectification channels are uniformly arranged on the circumference of the gas 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 holes are uniformly formed in the circumference of the part below the tower tray of the gas lift pipe II, and a plurality of gas inlet guide plates are arranged on the inner wall of the gas lift pipe II at the gas inlet holes. The efficient demisting device disclosed by the invention realizes the separation of liquid drops and gas through rectification, acceleration and a scraping effect of fluid in the flowing process. The efficient 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 effectively realizing gas-liquid separation, and especially suitable for occasions with large gas flow fluctuation.
Description
Technical Field
The invention relates to a gas-liquid separation device, in particular to a high-efficiency 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 process is commonly adopted in the environmental protection field to remove harmful substances such as sulfur dioxide in flue gas, namely, the flue gas is sprayedThe lye is sprayed 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 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 efficient 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 efficient 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 effectively realizing gas-liquid separation, and especially suitable for occasions with large gas flow fluctuation.
The efficient demisting device comprises a plurality of parallel demisting components, each demisting 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 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 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, the top of each rectifying channel is flush with the upper cover plate, the bottom of each rectifying channel is intersected with the pipe wall of the gas 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 by a certain distance, a plurality of gas inlet holes are uniformly formed in the circumference of the part below the tower tray of the gas lift pipe II, and a gas inlet guide plate is arranged on the inner wall of the gas lift pipe II at the gas inlet hole; the air inlet guide plate is arranged at the edge of the air inlet hole along the axial direction of the air lifting pipe and is connected with the inner wall of the air lifting pipe through a connecting piece; the connecting piece constitute by baffle and pivot, baffle along gas-lift pipe axial and gas-lift pipe inner wall fixed connection, the guide plate that admits air is connected with the baffle through the pivot, the guide plate that admits air is the baffle position round pivot pivoted maximum angle.
In the efficient demisting device, the number of the rectifying passages is generally 1 ~ 12, preferably 4-8, and the wall thickness of the rectifying passages is preferably the same as that of the gas lift pipe I.
In the efficient demisting device, 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, of the width w, the cross section of the rectifying channel 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 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 ~ 0.9.9 times of the cross section area of the draft tube I, and preferably 0.3 ~ 0.6.6 times of the cross section area of the draft tube I.
In the efficient demisting device, the tail end of the side wall II of the rectifying channel can be flush with the inner wall of the gas lift pipe I or extend into the gas lift pipe I for a certain distance m, wherein m is 0.1 ~ 0.9 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 gas lift pipe I, the tail end of the bottom of the rectifying channel is also flush with the inner wall of the gas lift pipe I, and when the side wall II of the rectifying channel extends into the gas lift pipe 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 efficient demisting device, 3 ~ 12 air inlet holes are generally arranged, preferably 4-8 air inlet holes are preferably arranged, the cross section of each air inlet hole is one or a combination of several of a rectangle, an ellipse, a circle, a trapezoid or a semicircle, and the like, preferably one or a combination of several of a rectangle, an ellipse or a circle, the total cross section of the air inlet holes is 0.6 ~ 1.5.5 times, preferably 0.8 ~ 1.2.2 times, the specific size is determined by a person skilled in the art according to actual working conditions or design requirements.
In the efficient demisting device, the included angle between the tangent plane of the outer wall of the air lift pipe, which is made by the connecting line of the midpoints of the upper and lower curves of the intersecting line of the air inlet hole and the outer wall of the air lift pipe II, and the plane of the baffle plate close to one side of the air inlet hole is gamma, wherein the gamma is 10 degrees ~ 60 degrees, and preferably 20 degrees ~ 35 degrees.
In the efficient demisting device, the rotating direction of each air inlet guide plate is the same as that of the rectifying channel, the shape of each air inlet guide plate can be one or a combination of more of rectangle, ellipse, circle, trapezoid or semicircle, and the like, the shape of each air inlet guide plate is preferably the same as that of an air inlet, and the sectional area of each air inlet guide plate is 1.1 ~ 2 times, preferably 1.3 ~ 1.5.5 times that of the air inlet.
In the efficient demisting device, the lower sealing cover plate (the bottom of the gas raising pipe II) is away from the tower tray by a certain distance K, and the distance K is 60-200 mm, preferably 80-120 mm.
In the efficient demisting device, the bottom of the rectifying 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 efficient 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 high-efficiency demisting device, the riser II is hermetically connected with the tower tray, and the diameters of the riser I and the riser II and the opening rate of the tower tray can be determined by a person skilled in the art according to actual working conditions or design requirements.
In the efficient demisting device, the lower cover plate and the gas lift pipe II can be welded together or integrally formed, and the rectifying channel, the upper cover plate and the gas lift pipe I can be welded together or integrally formed.
In the efficient demisting 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 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 efficient defogging device, the inner surface of the outer barrel is provided with the groove and/or the protrusion. 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 efficient defogging device, the inner surface of the outer cylinder is preferably provided with a groove with a cross section shape as shown in FIG. 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 alpha, alpha is 5 degrees ~ 70 degrees, preferably 10 degrees ~ 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 beta, beta is 30 degrees ~ 110 degrees, preferably 45 degrees ~ 90 degrees, the depth Z of the groove, namely the shortest distance from the intersection point of the arc and the straight line segment to the inner surface circumference of the outer cylinder is 0.1 ~ 0.7.7 times, preferably 0.3 ~ 0.5.5 times of the wall thickness, and the arc length between the intersection point of the arc and the inner surface circumference of the outer cylinder is 1/80 ~ 1/6 times of the.
In the efficient demisting device, the lower end opening of the outer cylinder can be arranged into a zigzag or wavy structure, so that separated liquid can drip from the inner wall of the outer cylinder in a continuous flow.
The high-efficiency demisting device ensures the sealing of the joints of the components and does not generate air leakage.
The efficient demisting device has the advantages that when the efficient demisting device works, gas carrying liquid drops enters the riser II along the horizontal direction from the gas inlet at the lower end of the tray, the gas phase flow direction is changed from the radial direction to the tangential direction after encountering the gas inlet guide plate, the gas inlet guide plate can rotate, the rotating angle can be automatically adjusted according to the flow rate of the gas, the gas flows upwards along the inner wall of the riser II in a spiral manner, the swirling effect is enhanced, in the process, part of the liquid drops collide with the gas inlet guide plate, some of the liquid drops adhere to and coalesce on the gas inlet guide plate, the adhered liquid drops gradually grow, the gravity generated by a part of the larger liquid drops exceeds the resultant force of the rising force of the gas and the liquid surface tension, the liquid drops fall along the surface of the gas inlet guide plate and are separated, namely, the first gas-liquid drop separation is completed, the other part of the larger liquid drops continue to flow along the gas, the riser II and the inner wall disc rotates upwards, the gas droplet disc, the gas flows along the riser I, the gas channel, the gas carrying liquid drops enter the gas carrying liquid drops and the riser, the gas carrying liquid drops and the gas channel, the gas drop carrying gas channel, the liquid drops collide with the gas channel, the liquid drops, the liquid drop carrying gas channel, the liquid drop channel is changed from the liquid drop channel, the liquid drop channel is changed from the liquid drop channel, the liquid drop channel is changed from the liquid drop channel, the rectifying channel is changed from the rectifying channel, the rectifying channel is changed from the rectifying channel, the.
The high-efficiency demisting device is applied to the absorption tower adopting the wet desulphurization process, the gas velocity entering the gas lift pipe is generally 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 of the gas velocity entering the gas lift pipe.
Compared with the prior art, the efficient 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 holes, the inner wall of the gas lift pipe II at the gas inlet holes is provided with a plurality of gas inlet guide plates, gas enters the gas lift pipe II along the horizontal direction, the gas phase flowing direction is changed from the radial direction to the tangential direction when encountering the gas inlet guide plates, and the gas inlet guide plates can rotate, so that the gas inlet guide plates can automatically adjust the rotating angle of the gas inlet guide plates within a certain range according to the gas flow, the gas can spiral upwards flowing along the inner wall of the gas lift pipe II and the gas lift pipe I, the cyclone effect is strengthened.
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 rectifying channel has a certain length, the original gas with dispersed liquid drops in the speed direction changes the speed direction along the direction of the rectifying channel after entering the rectifying channel, the speed direction is more regular and concentrated, the total sectional area of the rectifying channel is smaller than the cross-sectional area of the riser, the speed of the gas with the liquid drops entering the rectifying channel is increased due to the reduction of the flow area, 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 with 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 liquid drops can continuously move smoothly along the arc surface of the groove due to the included angle alpha of 5 degrees ~ 70 degrees until the liquid drops are obstructed by the straight line segment and flow downwards along the inner wall of the.
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 the efficient defogging device of the invention.
Fig. 2 is a schematic cross-sectional view of an air intake hole and an air intake baffle.
Fig. 3 is a schematic cross-sectional view of an efficient demister with a rectifying channel flush with the inner wall.
Fig. 4 is a schematic cross-sectional view of a high efficiency demister apparatus with a rectifying channel extending into the interior of the riser.
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-rectifying the channel; 4-outer cylinder; 5, sealing the cover plate; 6-groove; 7-an air intake baffle; 8-air inlet holes; 9-lower sealing cover plate; 10-a bearing; 11-riser II; 12-connector baffles; 13-connecting piece rotating shaft.
Detailed Description
The efficient demister of the invention is further described in detail with reference to the accompanying drawings and examples.
The efficient 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 on the outer side of 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 II11, the bottom part is provided with a lower sealing cover plate 9, and the gas lift pipe I2 is connected with the gas lift pipe II11 through a bearing 10; a plurality of rectifying channels 3 are uniformly arranged on the circumference of the draft tube I2, the rectifying channels 3 are horizontally embedded along the tangential direction of the outer wall of the draft tube I2, the side wall I of one side, close to the outer cylinder 4, of each rectifying channel 3 is tangent to the tube wall of the draft tube I2, the other side wall II of the rectifying channel 3 is intersected with the tube wall of the draft tube I2, the top of each rectifying channel 3 is flush with the upper cover plate 5, the bottom of each rectifying channel is intersected with the tube wall of the draft tube I2, and the rotating directions of; the riser II11 is fixed on the tray 1, the bottom of the riser II11 is lower than the tray 1 for a certain distance, a plurality of air inlet holes 8 are uniformly arranged on the circumference of the part below the tray 1 of the riser II11, and the inner wall of the riser II11 at the air inlet holes 8 is provided with an air inlet guide plate 7; the air inlet guide plate 7 is arranged at the edge of the air inlet 8 along the axial direction of the air lift pipe and is connected with the inner wall of the air lift pipe through a connecting piece; the connecting piece constitute by baffle 12 and pivot 13, baffle 12 along gas-lift pipe axial and gas-lift pipe inner wall fixed connection, air inlet guide plate 7 is connected with baffle 12 through pivot 13, air inlet guide plate 7 is the baffle 12 position round the pivot 13 pivoted maximum angle.
In the high-efficiency demisting device, 1 ~ 12 rectifying channels 3 are generally arranged, and 4-8 rectifying channels 3 are preferably arranged, and the wall thickness of the rectifying channels 3 is preferably the same as that of the gas lift pipe I2.
In the efficient demisting device, the length l of the rectifying 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 rectifying channel 3, the height h is the maximum vertical distance between the top and the bottom of the rectifying channel 3, the length l is 2 ~ 5 times, preferably 3 ~ 4 times, of the width w, the cross section of the rectifying channel 3 is one or a combination of more of rectangle, ellipse, circle, trapezoid or semicircle, and the like, preferably one or a combination of more of rectangle, ellipse or circle, the size of the rectifying channel 3 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 3 is generally 20-600 mm, preferably 100-300 mm, the width w of the rectifying channel 3 is generally 10-200 mm, preferably 20-100 mm, the total cross section area of the rectifying channel 3 is 0.2 ~ 0.9.9 times of the cross section area of the draft tube I2, and preferably 0.3 ~ 0.6.6 times of the cross section area of the draft tube I2.
In the efficient demisting device, the tail end of the side wall II of the rectifying channel 3 can be flush with the inner wall of the riser I2 or extend into the riser I2 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 3 is flush with the inner wall of the riser I2, the tail end of the bottom of the rectifying channel 3 is also flush with the inner wall of the riser I2, and when the side wall II of the rectifying channel 3 extends into the riser I2 for a certain distance m, the tail end of the bottom of the rectifying channel 3 is flush with the tail end of the side wall.
In the efficient demisting device, 3 ~ 12 air inlet holes 8 are generally arranged, preferably 4-8 air inlet holes 8 are preferably arranged, the cross section of each air inlet hole 8 is one or a combination of several of a rectangle, an ellipse, a circle, a trapezoid or a semicircle, and the like, preferably one or a combination of several of a rectangle, an ellipse or a circle, the total cross section area of the air inlet holes 8 is 0.6 ~ 1.5.5 times, preferably 0.8 ~ 1.2.2 times, the cross section area of the draft tube II11, and the specific size is determined by a person skilled in the art according to actual working conditions or design requirements.
In the efficient demisting device, the included angle between the tangent plane of the outer wall of the air lift pipe, which is made by the connecting line of the midpoints of the upper and lower curves of the intersecting line of the air inlet hole 8 and the outer wall of the air lift pipe II11, and the plane of the baffle plate 12 close to one side of the air inlet hole 8 is gamma, wherein the gamma is 10 degrees ~ 60 degrees, and preferably 20 degrees ~ 35 degrees.
In the efficient demisting device, the rotating direction of each air inlet guide plate 7 is the same as that of the rectifying channel 3, the shape of each air inlet guide plate 7 can be one or a combination of more of rectangle, ellipse, circle, trapezoid or semicircle, and the like, the shape of each air inlet guide plate 7 is preferably the same as that of the air inlet hole 8, and the sectional area of each air inlet guide plate 7 is 1.1 ~ 2 times, preferably 1.3 ~ 1.5 times of that of the air inlet hole 8.
In the efficient demisting device, the lower cover plate 9 (the bottom of the riser II 11) is away from the tray 1 by a certain distance K, wherein the distance K is 60-200 mm, and preferably 80-120 mm.
In the efficient demisting device, the bottom of the rectifying 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 efficient demisting device, the bottom of the bearing 10 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 high-efficiency demisting device, the riser II11 is hermetically connected with the tray 1, and the diameters of the riser I2 and the riser II11 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 efficient demisting device, the lower cover plate 9 and the gas lift pipe II11 can be welded together or integrally formed, and the rectifying channel 3, the upper cover plate 5 and the gas lift pipe I2 can be welded together or integrally formed.
In the efficient demisting device, 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 11. 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 rectifying 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 rectifying channel 3, and the distance B from the lower edge of the outer cylinder 4 to 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 rectifying channel 3.
In the efficient demisting device, the inner surface of the outer cylinder 4 is provided with grooves 6 and/or bulges. 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 efficient defogging device of the invention, the inner surface of the outer cylinder 4 is preferably provided with a groove 6 with a cross section shape as shown in fig. 5, the cross section of the groove 6 is composed of a circular arc and a straight line segment, wherein the intersection points of the circular arc and the inner surface circumference of the outer cylinder 4 are respectively made into tangent lines of the circular arc and the circumference, the included angle between the tangent lines is alpha, alpha is 5 degrees ~ degrees, preferably 10 degrees ~ degrees, the included angle between the tangent line of the circular arc made at the intersection point of the circular arc and the straight line segment is beta, beta is 30 degrees ~ degrees, preferably 45 degrees 3990 degrees, the depth Z of the groove 6, namely the shortest distance from the intersection point of the circular arc and the straight line segment to the inner surface circumference of the outer cylinder 4 is 0.1 ~.7 times, preferably 0.3 ~ times of the wall thickness of the outer cylinder 4, and the length between the intersection point of the circular arc and the inner surface circumference of.
In the efficient demisting device, the lower end opening of the outer cylinder 4 can be arranged into a zigzag or wavy structure, so that the separated liquid is more favorably dripped from the inner wall of the outer cylinder 4 in a continuous flow.
The high-efficiency demisting device ensures the sealing of the joints of the components and does not generate air leakage.
The efficient demisting device has the advantages that when the efficient demisting device works, gas carrying liquid drops enters the riser II11 from the gas inlet 8 at the lower end of the tray 1 along the horizontal direction, the gas flow direction is changed from the radial direction to the tangential direction after encountering the gas inlet guide plate 7, the turning angle can be automatically adjusted according to the flow rate of the gas, the gas flows upwards along the inner wall of the riser II11 to strengthen the swirling effect, part of the liquid drops collide with the gas inlet guide plate 7 in the process, so that some small liquid drops are attached and converged on the gas inlet guide plate 7, the attached liquid drops gradually become larger, gravity generated by a part of the larger liquid drops exceeds the resultant force of the rising force of the gas and the liquid surface tension, the liquid drops fall along the surface of the gas inlet guide plate 7 to be separated, namely, the first gas-liquid separation is completed, the other part of the larger liquid drops continuously collide with the gas, the liquid drops flow along the inner wall of the riser II11 and the riser I2, the inner wall disc rotates upwards, the liquid drops and the entrained liquid drops flow along the riser II 366, the entrained liquid drops are further, the entrained liquid drops enter the entrained liquid drops and flow channel, the rectifying groove 3, the rectifying groove is changed from the rectifying groove, the rectifying groove 7, the rectifying groove is changed from the rectifying groove, the rectifying groove 7, the rectifying groove 7 is changed from the rectifying groove, the rectifying groove 7, the rectifying groove is changed from the rectifying groove, the rectifying groove is changed from the rectifying groove, the rectifying groove 3, the rectifying groove is changed from the rectifying groove, the rectifying groove 3, the rectifying groove 3, the rectifying groove is changed from the rectifying groove 3, the.
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 (16)
1. A high-efficiency demisting device comprises a plurality of parallel demisting assemblies, and is characterized in that each demisting assembly comprises a gas riser and an outer cylinder, the outer cylinder is arranged on the outer side of the gas riser, 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 top part is provided with an upper sealing cover plate, the lower part is a gas riser II, the bottom part is provided with a lower sealing cover plate, the gas riser I is connected with the gas riser II through a bearing, the circumference of the gas riser I is uniformly provided with a plurality of rectifying channels, the rectifying channels are horizontally embedded along the tangential direction of the outer wall of the gas riser I, the side wall I of one side, close to the outer cylinder, of each rectifying channel is tangent to the wall of the gas riser I, the other side wall II is intersected with the wall of the gas riser I, the top part of each rectifying channel is flush with the upper sealing cover plate, the bottom part is intersected with the wall of the gas riser I, the rotating directions of the rectifying channels are the same, the gas riser II is fixed on a tower tray, the bottom part of the gas riser II is lower than a certain distance, the bottom part, the gas riser II is uniformly provided with a plurality of gas inlet holes, the gas inlet guide plates are arranged on the inner wall of the gas riser II, the gas inlet tray, the gas guide plates are connected with the baffle through a connecting piece, the baffle.
2. A high efficiency defogging device as recited in claim 1 wherein 1 ~ 12 said rectifying channels are provided.
3. A high efficiency demisting apparatus as set forth in claim 1 wherein the length l of the faired duct is the length of the side wall II, the width w is the maximum horizontal distance between the two side walls of the faired duct, the height h is the maximum vertical distance between the top and bottom of the faired duct, wherein the length l is 2 ~ 5 times the width w, and the cross-sectional shape of the faired duct is one or a combination of rectangular, oval, circular, trapezoidal or semicircular.
4. A highly effective demisting apparatus as set forth in claim 1, wherein the ends of the side walls II of the fairings are flush with the inner wall of the draft tube I or extend into the draft tube I a distance m, m being 0.1 ~ 0.9.9 times the length l.
5. A high-efficiency demisting device as set forth in claim 1, wherein 3 ~ 12 air inlet holes are provided, and the cross-sectional shape of the air inlet holes is one or more of rectangular, oval, circular, trapezoidal and semicircular.
6. The efficient defogging apparatus as recited in claim 1, wherein the tangent plane of the outer wall of said air lift tube taken by the connecting line of the midpoints of the upper and lower curves of the intersecting line of said air inlet hole and the outer wall of said air lift tube II forms an angle γ with the plane of said baffle plate on the side close to said air inlet hole, γ being 10 ° ~ 60 °.
7. A high efficiency defogging device as recited in claim 1 wherein: the rotating direction of each air inlet guide plate is the same as that of the rectifying channel.
8. The efficient defogging device as recited in claim 1 wherein the shape of the air intake baffle is one or more of rectangular, oval, circular, trapezoidal or semicircular, and the cross-sectional area of the air intake baffle is 1.1 ~ 2 times the cross-sectional area of the air intake hole.
9. A high efficiency defogging device as recited in claim 1 wherein: the lower cover plate is away from the tower tray by a certain distance K, and the distance K is 60-200 mm.
10. A high efficiency defogging device as recited 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.
11. A high efficiency 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.
12. A high efficiency 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 lift pipe I by a certain distance P, and the distance P 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, 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 rectifying channel.
13. A high efficiency defogging device as recited in claim 1 wherein: the inner surface of the outer cylinder is provided with grooves and/or bulges.
14. The efficient defogging device as recited in claim 1 wherein the cross-section of the groove formed in the inner surface of the outer barrel is comprised of an arc and a straight line segment, wherein the intersection points of the arc and the inner surface circumference of the outer barrel are respectively made into tangent lines of the arc and the circumference, the included angle between the tangent lines is α, α is 5 ° ~ °, the included angle between the tangent line of the arc made at the intersection point of the arc and the straight line segment is β, β is 30 ° ~ °, the depth Z of the groove, i.e., the shortest distance from the intersection point of the arc and the straight line segment to the inner surface circumference of the outer barrel is 0.1 ~.7 times the wall thickness of the outer barrel, and the arc length between the intersection point of the arc and the inner surface circumference of the outer barrel and the intersection point of.
15. Use of a high efficiency demister apparatus as defined in any one of claims 1 ~ 14 in a wet desulfurization process.
16. Use according to claim 15, wherein the velocity of the gas entering the draft tube is 3 to 20m/s, the velocity of the gas at the outlet of the rectifying duct is 10 to 40m/s, and the velocity of the gas at the outlet of the rectifying duct is 1.5 ~ 3 times the velocity of the gas entering the draft tube.
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| SU360984A1 (en) * | 1970-06-01 | 1972-12-07 | С. Пентешин, А. А. Степурин , В. Рольщиков Конструкторский проектно технологический институт | UNSUNCED |
| CN2902421Y (en) * | 2006-04-27 | 2007-05-23 | 兖矿鲁南化肥厂 | Regulatable dust eliminator |
| CN105363718A (en) * | 2015-12-08 | 2016-03-02 | 江苏揽山环境科技股份有限公司 | Flushing device and blade group with same |
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| CN2396883Y (en) * | 1999-11-26 | 2000-09-20 | 南京大学 | Conical cyclone gas distributing machine |
| TWM366611U (en) * | 2009-05-04 | 2009-10-11 | Wistron Corp | Centrifugal fan housing, centrifugal fan, and electronic device having the centrifugal fan |
| 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 |
| 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 |
| 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 |
|---|---|---|---|---|
| SU360984A1 (en) * | 1970-06-01 | 1972-12-07 | С. Пентешин, А. А. Степурин , В. Рольщиков Конструкторский проектно технологический институт | UNSUNCED |
| CN2902421Y (en) * | 2006-04-27 | 2007-05-23 | 兖矿鲁南化肥厂 | Regulatable dust eliminator |
| CN105363718A (en) * | 2015-12-08 | 2016-03-02 | 江苏揽山环境科技股份有限公司 | Flushing device and blade group with same |
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