CN108499226B - High-efficient defroster - Google Patents
High-efficient defroster Download PDFInfo
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- CN108499226B CN108499226B CN201710108907.3A CN201710108907A CN108499226B CN 108499226 B CN108499226 B CN 108499226B CN 201710108907 A CN201710108907 A CN 201710108907A CN 108499226 B CN108499226 B CN 108499226B
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- 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
Abstract
The invention discloses a high-efficiency demister. The efficient demister comprises a plurality of demisting components, and each demisting component comprises a gas lift pipe and an outer cylinder; the gas lift pipe is divided into an upper part and a lower part along the axial direction, the upper part is a gas lift pipe I, the lower part is a gas lift pipe II, and the gas lift pipe I is connected with the gas lift pipe II through a bearing; the top of the air-lift pipe I is provided with an upper sealing cover plate, the circumference of the air-lift pipe I is provided with a plurality of slits, and the circumference of the air-lift pipe I close to each slit is provided with blades; a plurality of air inlet holes are uniformly formed in the circumference of the part below the tray of the riser II, and an air inlet guide plate is arranged on the inner wall of the riser II at the air inlet hole; the inner surface of the outer cylinder is provided with a groove, and the cross section of the groove is formed by an arc and a straight line section. The efficient demister 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 particularly suitable for occasions with large gas flow fluctuation.
Description
Technical Field
The invention relates to a high-efficiency demister, belongs to the field of gas-liquid separation in chemical engineering, and is suitable for gas-liquid separation processes in the fields of chemical engineering, environmental protection and the like.
Background
SO2And dust are important reasons for causing air pollution in China and are also the air pollutants which are currently and mainly controlled in China. At present, wet process is mostly adopted in the field of environmental protection, and during the flue gas desulfurization process of the wet process, mist with the particle size of 10-60 micrometers is easily generated in the operation process of an absorption tower, contains water, and also dissolves sulfuric acid, sulfate and SO2And the like, and causes pollution to the atmospheric environment and serious corrosion to an exhaust funnel, a heat exchanger and the like. Therefore, in a wet desulfurization process, the purge gas must be demisted before leaving the absorber tower.
The demister is a treatment device for gas-liquid separation in the fields of chemical industry or environmental protection and the like. When the gas containing mist passes through the demister at a certain speed, the gas collides with the internal structure of the demister and adheres to the surface of the demister. Mist on the surface of the internal structure of the demister can be gradually gathered under the action of diffusion and gravity, and when the weight reaches a certain level, the mist can be separated from the internal structure of the demister. Thereby realizing gas-liquid separation. The demister is typically located at the top of the absorber tower. When the demister increases resistance to a preset value due to scaling in the operation process, a backwashing program needs to be started to flush the demister, and generally, flushing nozzles need to be arranged at the air inlet end and the air exhaust end of the demister. This can result in significant entrainment of the gas phase with the liquid phase, resulting in liquid entrainment of the gas phase.
Can divide into a large number of kinds according to usage, the structure of defroster, like silk screen defroster, herringbone board defroster, whirl board defroster, electric demister, shutter formula defroster and gravity settling type defroster etc.. The common demister comprises 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 part of a flow section, so that the flow section of airflow in the absorption tower is uniformly distributed. The phenomenon of gas-liquid countercurrent, namely secondary entrainment, can not be avoided in the process of liquid drop falling.
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 drop and air current direction flow against the current, has improved defogging efficiency, but this defroster structure is more complicated, and the preparation is difficult, owing to adopted the wire net structure moreover, the defroster pressure drop is great, also blocks up relatively easily.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-efficiency demister, which realizes the separation of liquid drops and gas through multiple baffling, acceleration and scraping effects of fluid in the flowing process. The efficient demister 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 particularly suitable for occasions with large gas flow fluctuation.
The high-efficiency demister comprises a plurality of parallel demisting components, each demisting component comprises a gas-raising pipe and an outer cylinder, and the outer cylinder is arranged on the outer side of the gas-raising pipe and is on the same axis with the gas-raising pipe; the inner surface of the outer cylinder is provided with a groove, and the cross section of the groove is formed by an arc and a straight line section; the gas lift pipe is divided into an upper part and a lower part along the axial direction, the upper part is a gas lift pipe I, the lower part is a gas lift pipe II, the gas lift pipe II is fixed on the tower tray, and the gas lift pipe I is connected with the gas lift pipe II through a bearing; the top of the air-lift pipe I is provided with an upper sealing cover plate, the circumference of the air-lift pipe I is provided with a plurality of slits, and the circumference of the air-lift pipe I close to each slit is provided with blades; the contour line of the cross section of the blade consists of four curves, namely a front edge line, a rear edge line, an upper edge line and a lower edge line, wherein the front edge line and the rear edge line are positioned at two ends of the contour line of the cross section of the blade, and the rear edge line is connected with a gas lift pipe I; the upper and lower edge lines are located between the leading and trailing edge lines. The front edge line and the rear edge line are both circular arcs, the upper edge line and the lower edge line are one of circular arcs, parabolas, B-spline curves or Bezier curves, preferably circular arcs or Bezier curves, and when the upper edge line and the lower edge line are Bezier curves, Bezier curves with five control points are preferably selected, namely Bezier curves with five points and four times; the rotation directions of the blades are the same.
In the high-efficiency demister of the invention, blades having the same shape and size are preferably used for design and installation convenience.
In the high-efficiency demister, the radius of a circle where a leading edge line of the cross section of each blade is 0.01-1 time of the radius of the gas lift pipe I, and the radius of a circle where a trailing edge line is located is the same as the outer diameter of the gas lift pipe I.
In the efficient demister, the height of the blades is h, h is 1-1.3 times of the height a of the strip seam, and preferably 1.1-1.2 times of the height a of the strip seam; the length s of the blade is 0.2-1 times, preferably 0.2-0.5 times of the diameter d of the draft tube II; the maximum width delta of the blade is 0.02-0.5 times of the length s of the blade. On the cross section of the gas lift pipe, the blade is fixedly connected with the outer wall of the gas lift pipe I, the intersection point of the lower edge line and the rear edge line of the blade is A, and the intersection point of the lower edge line and the front edge line of the blade is B. The included angle between the lower edge line of the blade and the radial direction of the riser passing through the point A is gamma, wherein the gamma is generally 15-70 degrees, and preferably 30-45 degrees; the angle between the lower edge line of the blade and the radial direction of the draft tube passing through the point B is eta, which is generally 20-80 degrees, preferably 30-60 degrees.
In the high-efficiency demister, the number of the strip seams on the gas lift pipe I is the same as that of the blades, the strip seams correspond to the blades one by one, and the number of the strip seams and the blades is generally 6 ~ 20, preferably 8-12.
In the efficient demister, the height a of the strip seam is 20-600 mm, preferably 100-300 mm; the width b of the slit can be generally 10 to 200mm, preferably 20 to 100 mm. The total opening area of the strip seams is 0.2-0.9 times of the cross section area of the draft tube I, and preferably 0.3-0.7 times of the cross section area of the draft tube I.
In the efficient demister, a lower sealing cover plate is arranged at the bottom of a draft tube II, the bottom of the draft tube II is lower than a tower tray by a certain distance, a plurality of air inlet holes are uniformly formed in the circumference of the part below the tower tray of the draft tube II, an air inlet guide plate is arranged on the inner wall of the draft tube II at the air inlet holes, 3 ~ air inlet holes are generally arranged, preferably 6-10 air inlet holes are arranged, the cross section of each air inlet hole is one or a combination of more of a rectangle, an ellipse, a circle, a trapezoid or a semicircle, the preferred combination of one or more of a rectangle, an ellipse or a circle, the total cross section of the air inlet holes is 0.6-1.5 times, preferably 0.8-1.2 times, the specific size is determined by an actual requirement or a design, the included angle theta is 10 degrees ~ degrees, the preferred angle is 20 degrees 3935 degrees, the included angle is formed by a tangent plane of the midpoint of the outer wall of the draft tube made by connecting lines of upper and lower curves of the intersection line of the air inlet holes in the intersecting line of the air inlet holes and the outer wall of the draft tube II, the draft tube is a rectangular plane close to the baffle plane close to the side of the air inlet hole, theta is 10 degrees ~ degrees, the baffle is preferably 20 degrees 3660 degrees, the semicircular baffle plate is connected with the baffle plate by a connecting piece, the baffle plate is connected with the baffle plate through the baffle plate, the baffle plate is connected with the baffle plate through the baffle plate and the baffle plate, the baffle.
The efficient demister comprises an outer cylinder, a groove, a straight line section and a circular arc, wherein the cross section of the groove is composed of the circular arc and the straight line section, the intersection point of the circular arc and the circumference of the inner surface of the outer cylinder is respectively made into tangent lines of the circular arc and the circumference, the included angle between the tangent lines is alpha, the included angle alpha and the included angle eta are complementary degrees, the included angle between the tangent line of the circular arc and the straight line section at the intersection point is beta, beta is 30 degrees ~ degrees, preferably 45 degrees ~ degrees, the included angle between the tangent line of the circular arc and the straight line section at the intersection point and the circumference of the inner surface of the outer cylinder is beta, beta is 30 degrees ~ degrees, preferably 45 degrees ~ degrees, the depth Z of the groove, namely the shortest distance from the intersection point of the circular arc and the straight line section to the circumference of the inner surface of the outer cylinder is 0.1 ~.7 times, preferably 0.3 times, and the arc length.
In the efficient demister, the lower sealing cover plate (the bottom of the gas raising pipe II) has a certain distance K from a tower tray, and the distance K is 60-200 mm, preferably 80-120 mm.
In the high-efficiency demister, the bottom of the upper blade of the gas-raising pipe I is away from a tower tray by a certain distance A, wherein the distance A is 60-300 mm, and preferably 80-120 mm.
In the high-efficiency demister, the bottom of the bearing has a certain distance C with the tower tray, and the distance C is 20-200 mm, preferably 40-80 mm.
In the high-efficiency demister, the riser II is hermetically connected with the tray, the height of the riser I is 1.1 ~ 3 times, preferably 1.2 ~ 1.5.5 times, the height h of the blade, and the diameters of the riser I and the riser II and the aperture ratio of the tray can be determined by a person skilled in the art according to actual working conditions or design requirements.
In the high-efficiency demister, the upper sealing cover plate and the gas riser I, and the lower sealing cover plate and the gas riser II can be welded together or integrally formed; the blades are connected with the gas lift pipe I and the baffle is connected with the gas lift pipe II through welding.
In the high-efficiency demister, the outer cylinder is preferably a cylinder, and the diameter D of the outer cylinder is 1.5 to 6 times, preferably 2 to 3 times 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 1-6 times, preferably 2-4 times, of the height h of the blades. 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 blade, 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 cylinder is 2.5-10 times, preferably 3-5 times of the height H of the blades.
In the high-efficiency demister, the lower end opening of the outer cylinder can be arranged into a zigzag or wave-shaped structure, so that separated liquid is more favorably dripped from the inner wall of the outer cylinder into continuous flow.
The joint of each component of the high-efficiency demister ensures sealing, and the phenomenon of air leakage is avoided.
When the high-efficiency demister works, gas carrying liquid drops enters the riser II from the gas inlet hole at the lower end of the tower tray along the horizontal direction, the gas phase flow direction is changed from the radial direction to the tangential direction after encountering the gas inlet guide plate, and the gas inlet guide plate can rotate, so that the rotation angle can be automatically adjusted according to the flow of the gas, the gas can spirally flow upwards along the inner wall of the riser II, and the cyclone effect is enhanced. In the process, part of the liquid drops collide with the air inlet guide plate to enable some small liquid drops to be attached and converged on the air inlet guide plate, the attached liquid drops gradually become larger, and when the gravity generated by the part of the larger liquid drops exceeds the resultant force of the rising force of the gas and the surface tension of the liquid, the liquid drops fall along the surface of the air inlet guide plate to be separated, namely, the first gas-liquid separation is completed; the other part of the larger liquid drops continuously flows with the gas and upwards flows along the inner wall discs of the gas rising pipe II and the gas rising pipe I in a rotating way. When the gas carrying the liquid drops flows upwards along the gas lift pipe, the gas phase flow direction is changed after meeting the upper cover plate, the gas phase flow direction is changed from the ascending direction to the horizontal direction or the approximately horizontal direction, the small liquid drops collide with the upper cover plate due to the inertia effect, the secondary gas-liquid separation is completed, meanwhile, part of the small liquid drops are gathered to form larger liquid drops and continuously flow along with the gas. The gas carrying with the liquid drops passes through the strip seam on the gas lift pipe I along the horizontal direction or the approximate horizontal direction, and the speed of the gas carrying with the liquid drops after passing through the strip seam is further increased because the total sectional area of the strip seam is smaller than the sectional area of the gas lift pipe. The gas carrying the liquid drops flows out from the strip slits and then collides with the blades, the flow direction of the gas phase is changed again, the liquid drops which are not removed are captured at the blades under the same action, and the third gas-liquid separation is completed. And because the profile curve of the blade is a smooth transition curve, the speed direction of the gas after the gas collides with any point on the blade is different, so that the gas is uniformly distributed in the section between the gas rising pipe and the outer cylinder, the generation of bias flow is avoided, and the impact force of the gas on the blade is also reduced. The gas continues to flow and collides with the inner wall of the outer cylinder, the flow direction of the gas is changed again, and the gas changes from the relatively dispersed flow direction to flow along the circumferential direction of the inner wall of the outer cylinder. The gas carrying with the liquid drops has higher speed, and generates obvious scraping effect when rotating and flowing upwards along the inner wall of the outer cylinder provided with the groove. And after the gas carrying the liquid drops collides with the blades, the small liquid drops which are not removed continue to move along the profile lines of the blades under the action of inertia, and because the included angle eta between the lower edge line of the blades and the radial direction of the gas lifting pipe and the included angle alpha between the arc of the groove and the inner surface of the outer cylinder are complementary, the small liquid drops which are not removed continue to flow along the direction which has the included angle alpha with the outer cylinder and directly flow into the groove along the tangential direction of the arc of the groove, so that the scraping effect is further enhanced. The scraping effect means that when high-speed gas carrying liquid drops flows upwards along the inner wall of the outer barrel in a rotating mode, the liquid drops are thrown to the outer edge continuously under the action of inertia force, the liquid drops enter the groove and move smoothly along the arc section in the groove, the liquid drops are contacted, gathered and enlarged until the liquid drops are obstructed by the straight line section, the gathered and enlarged liquid drops are in strong impact with the wall surface of the straight line section and are attached to the straight line section of the groove in the inner wall of the outer barrel, and the liquid drops continue to be gathered and enlarged and then flow downwards along the inner wall of the outer barrel; and the gas continuously keeps flowing upwards along the inner wall of the outer cylinder at a high speed, so that gas-liquid separation is realized again, and entrainment is reduced. And the gas carrying with liquid drops flows out from the strip seam and then impacts the blade, under the pushing action of the gas, the gas lift pipe I rotates relative to the gas lift pipe II through the connecting bearing, and because the profile curve of the blade is a smooth transition curve, when the gas lift pipe I rotates, the air resistance is lower, and the rotating effect of the gas lift pipe I driven by the bearing is enhanced. The rotation direction of the air lift pipe I is opposite to the rotation direction of the blades, so that the air acted by the blades continuously impacts all over the inner wall of the outer barrel, but only impacts the fixed position of the inner wall of the outer barrel, the scraping effect is enhanced, and meanwhile, the air is more favorably and uniformly distributed in the outer barrel. Through the baffling, accelerating and scraping effects, the liquid is separated from the gas in the flowing process.
The application of the high-efficiency demister in the absorption tower adopting the wet desulphurization process generally has the gas velocity entering the riser II of 3-20m/s, the gas velocity flowing out from the strip slit of 10-40m/s and the gas velocity flowing out from the strip slit of 1.5 ~ 3 times of the gas velocity entering the riser II.
Compared with the prior art, the high-efficiency demister 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 air lift pipe I is connected with the air lift pipe II through the bearing, the air lift pipe I rotates under the action of gas, the rotating direction of the air lift pipe I is opposite to the rotating direction of the air outlet rectifying channel, so that the gas acted by the blades continuously impacts all around the circumferential inner wall of the outer barrel, and only impacts the fixed position of the inner wall of the outer barrel, so that the gas is uniformly distributed in the outer barrel, the scraping effect is enhanced, and the air lift pipe I rotates due to the fact that the profile curve of the blades is a smooth transition curve, the air resistance is lower, and the rotating effect that the bearing drives the air lift pipe I is enhanced.
3. Because the leading edge line and the trailing edge line of the blade are arcs, parabolas, B-spline curves or Bezier curves, the curves are in smooth transition, and the speed directions of the gas after the gas collides with any point on the blade are different, so that the gas is uniformly distributed in the section between the gas lift pipe and the outer cylinder, the generation of bias flow is avoided, and the impact force of the gas on the blade is also reduced.
4. The section of the groove on the inner surface of the cylinder is composed of an arc and a straight line segment, when high-speed gas carrying liquid drops flows upwards along the rotation of the inner wall of the outer cylinder, the liquid drops are thrown outwards continuously under the action of inertia force, the liquid drops enter the groove and move along the arc segment in the groove, and because the included angle alpha is 5 degrees ~ 70 degrees, the liquid drops can continuously move smoothly along the arc surface of the groove until the straight line segment is blocked and then flow downwards along the inner wall of the outer cylinder, and no dead zone exists.
5. After the gas carrying the liquid drops collides with the blades, the small liquid drops which are not removed continue to move along the profile lines of the blades under the action of inertia, and because the included angle eta between the lower edge line of the blades and the radial direction of the gas lifting pipe and the included angle alpha between the circular arc of the groove and the inner surface of the outer cylinder are complementary, the small liquid drops which are not removed continue to flow along the direction of the included angle alpha between the small liquid drops and the outer cylinder and directly flow into the groove along the tangential direction of the circular arc of the groove, so that the scraping effect is further enhanced.
6. 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.
7. The gas flow is uniform, the flow resistance is small, and the resistance is reduced.
8. Simple structure, convenient manufacture, difficult blockage and scaling and no need of backwashing.
9. 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 diagram of a high efficiency demister of the present invention.
FIG. 2 is a schematic structural view of the cross-section of the draft tube I, the blades and the outer cylinder.
FIG. 3 is a schematic view of a cross-sectional profile line structure of a blade.
Fig. 4 is a schematic view of a blade structure.
Fig. 5 is a schematic cross-sectional view of the grooves, the blades and the draft tube I on the outer cylinder.
FIG. 6 is a schematic cross-sectional view of an air intake hole and an air intake baffle.
Each of the labels in the figure is: 1-a tray; 2-draft tube II; 3-a bearing; 4-a riser I; 5-strip sewing; 6-blade; 7-upper cover plate; 8-a groove; 9-outer cylinder; 10-leading edge line; 11-trailing edge line; 12-upper edge line; 13-lower edge line; 14-an air intake; 15-lower sealing cover plate; 16-a rotating shaft; 17-a baffle; 18-intake air deflector.
Detailed Description
The high efficiency demister of the present invention will be further described in detail with reference to the accompanying drawings and examples.
The high-efficiency demister comprises a plurality of parallel demisting components, each demisting component comprises a gas-raising pipe and an outer cylinder 9, and the outer cylinder 9 is arranged on the outer side of the gas-raising pipe and is on the same axis with the gas-raising pipe; the inner surface of the outer cylinder 9 is provided with a groove 8, and the cross section of the groove 8 consists of an arc and a straight line section; the gas lift tube is divided into an upper part and a lower part along the axial direction, the upper part is a gas lift tube I4, the lower part is a gas lift tube II2, the gas lift tube II2 is fixed on the tray 1, and the gas lift tube I4 is connected with the gas lift tube II2 through a bearing 3; the top of the air lift pipe I4 is provided with an upper sealing plate 7, the circumference of the air lift pipe I4 is provided with a plurality of slits 5, and the circumference of the air lift pipe I4 close to each slit 5 is provided with blades 6; the contour line of the cross section of the blade 6 is composed of four curves, namely a front edge line 10, a rear edge line 11, an upper edge line 12 and a lower edge line 13, wherein the front edge line 10 and the rear edge line 11 are positioned at two ends of the contour line of the cross section of the blade 6, and the rear edge line 11 is connected with a gas lift pipe I4; the upper edge line 12 and the lower edge line 13 are located between the leading edge line 10 and the trailing edge line 11. The front edge line 10 and the rear edge line 11 are both circular arcs, the upper edge line 12 and the lower edge line 13 are one of circular arcs, parabolas, B-spline curves or Bezier curves, preferably circular arcs or Bezier curves, and when the upper edge line 12 and the lower edge line 13 are Bezier curves, Bezier curves of five control points, namely five-point and four-time Bezier curves, are preferably selected; the rotation directions of the blades 6 are the same.
In the high-efficiency demister of the present invention, it is preferable to use the vanes 6 having the same shape and size for the sake of design and installation.
In the high-efficiency demister, the radius of a circle where a leading edge line 10 of the cross section of each blade 6 is 0.01-1 time of the radius of the draft tube I4, and the radius of a circle where a trailing edge line 11 is located is the same as the outer diameter of the draft tube I4.
In the high-efficiency demister, the height of the blade 6 is h, h is 1-1.3 times of the height a of the strip seam 5, and preferably 1.1-1.2 times of the height a of the strip seam 5; the length s of the blade 6 is 0.2-1 times, preferably 0.2-0.5 times of the diameter d of the draft tube II 2; the maximum width delta of the blade 6 is 0.02-0.5 times of the length s of the blade 6. On the cross section of the gas lift tube, the blade 6 is fixedly connected with the outer wall of the gas lift tube I4, the intersection point of the lower edge line 13 of the blade 6 and the rear edge line 11 is A, and the intersection point of the lower edge line 13 of the blade 6 and the front edge line 10 is B. The included angle between the lower edge line 13 of the blade 6 and the radial direction of the riser passing through the point A is gamma, and the gamma is generally 15-70 degrees, preferably 30-45 degrees; the angle between the lower edge line 13 of the vane 6 and the radial direction of the draft tube passing through the point B is η, which is generally 20 to 80 °, preferably 30 to 60 °.
In the high-efficiency demister of the invention, the number of the slots 5 on the draft tube I4 is the same as the number of the blades 6, the slots 5 correspond to the blades 6 one by one, and the number of the slots 5 and the blades 6 is generally 6 ~ 20, preferably 8-12.
In the efficient demister, the height a of the strip seam 5 is 20-600 mm, preferably 100-300 mm; the width b of the slit 5 may be generally 10 to 200mm, preferably 20 to 100 mm. The total opening area of the strip seams 5 is 0.2-0.9 times of the cross-sectional area of the draft tube I4, and preferably 0.3-0.7 times of the cross-sectional area of the draft tube I4.
In the efficient demister, a lower sealing cover plate 15 is arranged at the bottom of a draft tube II2, the bottom of a draft tube II2 is a certain distance lower than a tray 1, a plurality of air inlet holes 14 are uniformly formed in the circumference of the part below the tray 1 of the draft tube II2, an air inlet guide plate 18 is arranged on the inner wall of the draft tube II2 at the air inlet hole 14, generally 3 ~ air inlet holes 14 are arranged, preferably 6-10 air inlet holes 14 are arranged, the cross section of the air inlet holes 14 is in one or a combination of a plurality of rectangular, elliptical, circular, trapezoidal or semicircular shapes, preferably one or a combination of a plurality of rectangular, elliptical or circular shapes, the total cross section of the air inlet holes 14 is 0.6-1.5 times, preferably 0.8-1.2 times, the specific size is determined by a person skilled in the field according to actual working conditions or design requirements, a tangent line of middle points of two upper and lower rectangular curves of intersecting lines of the outer walls of the air inlet holes 14 and the draft tube II2 is made into a tangent line, the tangent plane of the draft tube outer wall of which is close to the air inlet hole 14, the baffle plate 17 at one side of the baffle plate 17, the baffle plate 17 is theta 28 degrees, the baffle plate is preferably 10 degrees, the baffle plate is connected with the baffle plate 18, the baffle plate 18 is connected with the air inlet tube 18 through a rotating shaft 16, the baffle plate 18 is connected with the baffle plate 18 and the baffle plate 18 in the baffle plate 18 and the baffle plate 18, the baffle plate 18 is preferably connected with the baffle plate 18, the baffle plate 18 in the baffle plate 18, the.
In the efficient demister, a groove 8 is arranged on the inner surface of an outer cylinder 9, the cross section of the groove 8 is composed of an arc and a straight line segment, wherein intersection points of the arc and the inner surface circumference of the outer cylinder 9 are respectively tangent lines of the arc and the circumference, the included angle between the tangent lines is alpha, and the included angle alpha and the included angle eta are complementary, 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 8, 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 9 is 0.1 ~ 0.7.7 times, preferably 0.3 ~ 0.5.5 times of the wall thickness of the outer cylinder 9, and the arc length between the intersection point of the arc and the inner surface circumference of the outer cylinder 9 and the intersection point of the inner surface circumference of the outer cylinder 9 is 1/80 ~ 1/6 of the inner surface circumference of the outer cylinder 9.
In the efficient demister, the lower cover plate 15 (the bottom of the riser II 2) has a certain distance K from the tray 1, wherein the distance K is 60-200 mm, and preferably 80-120 mm.
In the high-efficiency demister, the bottom of the upper blade 6 of the gas-raising pipe I4 is away from the tray 1 by a certain distance A, wherein the distance A is 60-300 mm, and preferably 80-120 mm.
In the high-efficiency demister, the bottom of the bearing 3 has a certain distance C with the tower tray 1, and the distance C is 20-200 mm, preferably 40-80 mm.
In the high-efficiency demister, the riser II2 is hermetically connected with the tray 1, the height of the riser I4 is 1.1 ~ 3 times, preferably 1.2 ~ 1.5.5 times, the height h of the blade 6, the diameters of the riser I4 and the riser II2 and the aperture ratio of the tray 1 can be determined by a person skilled in the art according to actual working conditions or design requirements.
In the high-efficiency demister, the upper cover plate 7 and the gas riser I4, and the lower cover plate 15 and the gas riser II2 can be welded together or integrally formed; the blade 6 is connected with the gas lift pipe I4, the baffle 17 is connected with the gas lift pipe II2 through welding.
In the high-efficiency demister of the invention, the outer cylinder 9 is preferably a cylinder, and the diameter D of the outer cylinder 9 is 1.5 to 6 times, preferably 2 to 3 times, the diameter D of the draft tube II 2. The upper edge of the outer cylinder 9 is higher than the upper edge of the air lift pipe I4 by a certain distance P, and the distance P is 1-6 times, preferably 2-4 times, of the height h of the blade 6. The lower edge of the outer cylinder 9 is away from the tower tray 1 by a certain distance B and is lower than the lower edge of the blade 6, and the distance B from the lower edge of the outer cylinder 9 to the tower tray 1 is 5-100 mm, preferably 20-50 mm. The total height H of the outer cylinder 9 is 2.5 to 10 times, preferably 3 to 5 times, the height H of the blade 6.
In the high-efficiency demister of the invention, the lower end opening of the outer cylinder 9 can be arranged into a zigzag or wave-shaped structure, thereby being more beneficial to the separated liquid to drip continuously from the inner wall of the outer cylinder 9.
Examples
180000Nm for flue gas purified by wet scrubber3The apparent water concentration is 10-15 g/Nm3After demisting by the invention, the concentration of the apparent water in the exhaust gas is less than 0.8g/Nm3And the demisting efficiency is more than 90 percent.
Claims (11)
1. A high-efficient defroster which characterized in that: 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 and is on the same axis with the gas lift pipe; the inner surface of the outer cylinder is provided with a groove, and the cross section of the groove is formed by an arc and a straight line section; the gas lift pipe is divided into an upper part and a lower part along the axial direction, the upper part is a gas lift pipe I, the lower part is a gas lift pipe II, the gas lift pipe II is fixed on the tower tray, and the gas lift pipe I is connected with the gas lift pipe II through a bearing; the top of the air-lift pipe I is provided with an upper sealing cover plate, the circumference of the air-lift pipe I is provided with a plurality of slits, and the circumference of the air-lift pipe I close to each slit is provided with blades; the contour line of the cross section of the blade consists of four curves, namely a front edge line, a rear edge line, an upper edge line and a lower edge line, wherein the front edge line and the rear edge line are positioned at two ends of the contour line of the cross section of the blade, and the rear edge line is connected with a gas lift pipe I; the upper edge line and the lower edge line are positioned between the front edge line and the rear edge line, the front edge line and the rear edge line are both circular arcs, and the upper edge line and the lower edge line are one of circular arcs, parabolas, B-spline curves or Bezier curves; the rotation directions of the blades are the same; the intersection point of the lower edge line and the rear edge line of the blade is A, the intersection point of the lower edge line and the front edge line of the blade is B, and the included angle gamma between the lower edge line of the blade and the radial direction of the riser passing through the point A is 15-70 degrees; the included angle between the lower edge line of the blade and the radial direction of the air lifting pipe passing through the point B is 20-80 degrees; in the cross section shape of the groove, the intersection points of the circular arc and the circumference of the inner surface of the outer cylinder are tangent lines of the circular arc and the circumference respectively, the included angle between the tangent lines is alpha, and the included angle alpha and the included angle eta are complementary.
2. The high efficiency mist eliminator of claim 1, wherein: the top and bottom edge lines are Bezier curves for five control points.
3. The high efficiency mist eliminator of claim 1, wherein: the radius of a circle where a leading edge line of the cross section of each blade is 0.01-1 times of the radius of the gas lift pipe I, and the radius of a circle where a trailing edge line is located is the same as the outer diameter of the gas lift pipe I.
4. The high efficiency mist eliminator of claim 1, wherein: the height of the blade is h, h is 1-1.3 times of the height a of the strip seam, the length s of the blade is 0.2-1 times of the diameter d of the draft tube II, and the maximum width delta of the blade is 0.02-0.5 times of the length s of the blade.
5. A high-efficiency demister according to claim 1, wherein the number of the slots on the draft tube I is the same as the number of the vanes, the slots correspond to the vanes one by one, and 6 ~ 20 slots and vanes are provided.
6. The high efficiency mist eliminator of claim 1, wherein: the total opening area of the strip seams is 0.2-0.9 times of the cross section area of the air draft tube I.
7. The efficient demister as set forth in claim 1, wherein an angle β between a tangent line of a circular arc formed at an intersection of the circular arc and the straight line segment is 30 ° ~ 110 °, a groove depth Z, which is a shortest distance from the intersection of the circular arc and the straight line segment to the circumference of the inner surface of the outer cylinder, is 0.1 ~ 0.7.7 times a wall thickness of the outer cylinder, and an arc length between the intersection of the circular arc and the circumference of the inner surface of the outer cylinder and the intersection of the straight line segment and the circumference of the inner surface of the outer cylinder is 1/80 ~ 1/6.
8. The high efficiency mist eliminator of claim 1, wherein: the number of the grooves is larger than or equal to that of the blades.
9. The high-efficiency demister according to claim 1, wherein the bottom of the gas lift tube II is provided with a lower cover plate, the bottom of the gas lift tube II is lower than the tray by a certain distance, a plurality of gas inlet holes are uniformly formed in the circumference of the part below the tray of the gas lift tube II, the inner wall of the gas lift tube II at the gas inlet holes is provided with gas inlet guide plates, 3 ~ 12 gas inlet holes are formed, the cross section of each gas inlet hole is one or a combination of a plurality of rectangular, oval, circular, trapezoidal or semicircular, the total cross section area of the gas inlet holes is 0.6-1.5 times of the cross section area of the gas lift tube II, the included angle theta between the tangent plane of the outer wall of the gas lift tube, which is made by connecting the middle points of two upper and lower curves in the intersecting line of the gas inlet holes and the outer wall of the gas lift tube II, and the plane of the baffle plate close to one side of the gas inlet holes is 10- ~ 60 degrees, the gas inlet guide plates are arranged at the edges of the gas inlet holes in the axial direction of the gas lift tube and are connected with the inner wall of the gas.
10. The efficient demister according to claim 9, wherein the direction of rotation of each air inlet guide plate is the same as the direction of rotation of the vanes, the shape of the air inlet guide plate is one or a combination of several of rectangle, ellipse, circle, trapezoid or semicircle, and the cross-sectional area of the air inlet guide plate is 1.1 ~ 2 times of the cross-sectional area of the air inlet hole.
11. The efficient demister as set forth in claim 1, wherein the diameter D of the outer cylinder is 1.5-6 times of the diameter D of the riser II, the upper edge of the outer cylinder is higher than the upper edge of the riser I by a certain distance P, the distance P is 1-6 times of the height H of the vane, the lower edge of the outer cylinder is at a certain distance B from the tray and lower than the lower edge of the vane, the distance B from the lower edge of the outer cylinder to the tray is 5-100 mm, the total height H of the outer cylinder is 2.5-10 times of the height H of the vane, and the height of the riser I is 1.1 ~ 3 times of the height H of the vane.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324559A (en) * | 2014-10-29 | 2015-02-04 | 中国石油天然气集团公司 | Oil-water-gas separator |
| CN205236212U (en) * | 2015-12-29 | 2016-05-18 | 中国石油大学(北京) | Cyclone who separates multiple exhaust that admits air |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2242129Y (en) * | 1995-11-17 | 1996-12-11 | 天津市环境保护科学研究所 | High efficiency vortex purification dust remover |
| CN2396883Y (en) * | 1999-11-26 | 2000-09-20 | 南京大学 | Conical cyclone gas distributing machine |
| US7258713B2 (en) * | 2004-08-27 | 2007-08-21 | Dreison International, Inc. | Inlet vane for centrifugal particle separator |
| JP2010035771A (en) * | 2008-08-04 | 2010-02-18 | Sharp Corp | Cyclone separator |
| 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 |
-
2017
- 2017-02-27 CN CN201710108907.3A patent/CN108499226B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324559A (en) * | 2014-10-29 | 2015-02-04 | 中国石油天然气集团公司 | Oil-water-gas separator |
| CN205236212U (en) * | 2015-12-29 | 2016-05-18 | 中国石油大学(北京) | Cyclone who separates multiple exhaust that admits air |
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