Liquid film type cyclone separator based on coanda effect inlet

Abstract

The utility model discloses a liquid film type cyclone separator based on a coanda effect inlet, which comprises an inlet pipe, a cylinder, a cone, an exhaust pipe and a liquid inlet pipe, the top of the cylinder is a conical surface with a high middle and a low periphery, and a plurality of drain holes are uniformly distributed on the periphery of the top of the conical surface; the side wall of the cylinder extends upwards along the top to form a wall surface; the inlet pipe is tangentially connected with the cylinder, and the joint is in an arc shape with a certain angle to form a coanda effect; the lower part of the cone is communicated with the dust collection box; the exhaust pipe penetrates through the top of the cylinder and is coaxial with the cylinder; the bottom of the exhaust pipe is lower than that of the inlet pipe; the liquid inlet pipe is located on the opposite side of the inlet pipe, penetrates through the wall face above the barrel and then extends to the position near the exhaust pipe, liquid enters the barrel through the liquid inlet pipe to form a liquid film, and the liquid film covering face corresponds to the inlet airflow direction. According to the cyclone separator, the separation efficiency can be improved, and the service life of the cyclone separator is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of industrial dust removal and gas purification, in particular to a liquid film cyclone separator based on the Coanda effect inlet. Background Art

[0002] Cyclone separators have always been important industrial dust removal and gas purification devices due to their simplicity, ease of use, moderate energy consumption, high separation efficiency, and high adjustability. Cyclone separators use the principle of centrifugal force to separate gas and solid particles according to the different centrifugal forces of gas and solid particles. The structure of a cyclone separator generally includes several important parts, such as an inlet pipe, a cylinder, a cone, an exhaust pipe, and a dust box. When the dust-laden gas enters the cyclone separator from the inlet pipe, it first enters the cylinder tangentially at a high speed; then, the rotating airflow moves downward along the outer wall of the separator to the bottom of the cone, changes direction, and rotates upward along the axis, and finally is discharged through the exhaust pipe. During the rotation of the airflow, the particulate matter moves toward the outer wall of the separator under the action of centrifugal force, and the particles reaching the outer wall fall into the dust box under the combined action of gravity and airflow. The cyclone separator has a high separation efficiency for large particles, especially particles with a radius of more than 5μm, which can reach more than 90%. Therefore, cyclone separators are often used as pre-separators for removing coarse particles in industry.

[0003] The inlet pipe of the cyclone separator is one of the main factors affecting the efficiency and resistance of the separator. In order to improve efficiency and reduce wear. Methods for improving the inlet are proposed, which can be summarized into two types: one is a single inlet, which generally changes the shape of the inlet cross section and the overall structure. For example, circular, rectangular and other shapes. This method can greatly affect the performance of the cyclone separator. The other is a multi-inlet, such as a tangential double-inlet cyclone separator on the same side. The cutting particle size of this multi-inlet cyclone separator becomes smaller, thereby improving the separation efficiency, but its structure is difficult to achieve.

[0004] In addition to the influence of the inlet pipe, the inner wall of the cyclone separator also has a significant impact on the separation efficiency. Improvement methods include: First, changing the material used for the separator, such as carbon steel and polymer materials. The smooth inner wall of the separator made of polymer materials makes it easier for particles to slide off the wall, but it also makes it easy for particles to be sucked up again, thereby reducing the separation efficiency; in addition, changing the state of the inner wall of the separator, such as grinding, chemical treatment, spraying, etc., especially using polytetrafluoroethylene walls with good corrosion resistance, wear resistance and anti-sticking properties, which can effectively avoid the degradation of separator performance caused by long-term accumulation of particles on the wall. Correct use of these methods can not only improve the separation efficiency, but also reduce the wear of particles, thereby extending the service life. Summary of the invention

[0005] The utility model aims to provide a liquid film cyclone separator based on a Coanda effect inlet, which can improve separation efficiency and prolong the service life of the cyclone separator, in view of the deficiencies in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid film cyclone separator based on a Coanda effect inlet comprises an inlet pipe, a cylinder, a cone, an exhaust pipe and a liquid inlet pipe;

[0008] The top of the cylinder is a conical surface with a high middle and low sides, and a plurality of drainage holes are evenly distributed around the top of the conical surface; the side wall of the cylinder extends upward along the top to form a wall surface;

[0009] The cross-section of the inlet pipe is rectangular, and the inlet port is connected to the cylinder tangently. The connection is in the shape of an arc at a certain angle, forming a Coanda effect. At this time, the airflow will deviate from the original flow direction and flow along the convex arc surface, so that the airflow entering the cylinder is closer to the wall surface; at the same time, the size of the inlet pipe after using the arc is reduced compared with the traditional inlet pipe;

[0010] The upper part of the cone is connected to the lower end of the cylinder, and the lower part is connected to the dust collecting box;

[0011] The exhaust pipe passes through the top of the cylinder and is coaxially arranged with the cylinder, and the bottom of the exhaust pipe is lower than the bottom of the inlet pipe;

[0012] The liquid inlet pipe is located on the opposite side of the inlet pipe, penetrates the wall above the cylinder and then extends to the vicinity of the exhaust pipe. The liquid enters the cylinder through the liquid inlet pipe and the drainage holes on the conical surface at the top of the cylinder and evenly forms a thin liquid film on the inner wall of the cylinder. The liquid film covers the surface corresponding to the inlet airflow direction. The formed liquid film can not only reduce the erosion effect of particles in the cyclone on the inner wall of the cylinder, but also makes it easier for the particles to separate from the cyclone and flow into the dust collecting box.

[0013] Preferably, the angle formed by the conical surface at the top of the cylinder and the horizontal plane is in the range of 5° to 10°.

[0014] The distance between each drainage hole of the cylinder and the top edge is 0.2mm~0.5mm.

[0015] Preferably, the cross-sectional shape of the liquid inlet pipe is circular.

[0016] The liquid inlet pipe of the utility model can be formed into a Y-shaped outlet at the tail end or a circular tube shell covering the exhaust pipe, so that the liquid can flow to the drain port at the top more evenly, thereby making the liquid film on the inner wall of the separator more evenly distributed.

[0017] The air inlet of the utility model entering the cylinder through the inlet pipe can also be symmetrically placed on the other side, so that the rotation direction of the airflow in the separator changes from clockwise to counterclockwise.

[0018] The beneficial effects of the utility model are:

[0019] 1. The connection between the inlet pipe and the cylinder is in an arc shape with a certain angle, and the size is smaller than that of the traditional inlet pipe. The coarse and fine particles in the airflow are easy to collide with each other and condense into large particles in the arc section of the inlet pipe. The large particles are easier to be captured and separated in the cyclone separator, thereby improving the separation efficiency;

[0020] Second, due to the guiding effect of the Coanda effect on the airflow, the airflow containing particles is more likely to be biased toward the wall of the cylinder and away from the inner vortex fluid, and the particles are more easily captured by the separator.

[0021] 3. Due to the presence of liquid film on the inner wall, the capture of particles can be strengthened and the separation efficiency can be improved. At the same time, the liquid film has an anti-sticking effect, which effectively prevents the accumulation of particles on the inner wall, thereby effectively preventing the reduction of separation effect and reducing cleaning costs;

[0022] Fourth, due to the buffering effect of the liquid film, it can effectively reduce the erosion of particles on the inner wall surface, prevent the inner wall surface from being corroded, and thus extend the service life;

[0023] 5. The tail end of the liquid inlet pipe can be made into a Y-shaped outlet or a circular tube shell covering the exhaust pipe, so that the liquid can flow more evenly to the drainage hole on the top cone of the cylinder, thereby making the liquid film on the inner wall of the separator more evenly distributed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0025] Figure 2 for Figure 1 The main view;

[0026] Figure 3 This is a schematic diagram of the cone surface at the top of the cylinder in the utility model;

[0027] Figure 4 It is a schematic diagram of the cross-sectional shape of the liquid inlet pipe in the utility model;

[0028] Figure 5 A schematic diagram of a liquid inlet pipe in the form of a Y-shaped outlet in the utility model;

[0029] Figure 6 It is a schematic diagram of a liquid inlet pipe in the form of a circular ring-shaped coated pipe in the utility model;

[0030] In the figure, 1-inlet pipe, 11-arc segment, 2-top cone of cylinder, 3-wall, 4-exhaust pipe, 5-liquid inlet pipe, 6-outlet, 61-Y-shaped outlet, 62-annular coated pipe, 7-cylinder, 8-cone, 9-dust collecting box. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-Figure 6 The utility model is further illustrated with reference to the accompanying drawings and embodiments.

[0032] A liquid film cyclone separator based on a Coanda effect inlet comprises an inlet pipe 1, a cylinder 7, a cone 8, an exhaust pipe 4 and a liquid inlet pipe 5;

[0033] The cone surface 2 at the top of the cylinder is high in the middle and low around. Figure 2 As shown, a number of drainage holes are evenly distributed around the top of the cone surface; the side wall of the cylinder 7 extends upward along the top to form a wall surface 3;

[0034] The cross-section of the inlet pipe 1 is rectangular, and the arc section 11 of the inlet pipe 1 is tangentially connected to the cylindrical body 7. The connection is in an arc shape at a certain angle, forming a Coanda effect. At this time, the airflow will deviate from the original flow direction and flow along the convex arc surface, so that the airflow entering the cylindrical body 7 is closer to the wall surface 3. At the same time, the size of the inlet pipe 1 after using the arc is reduced compared with the traditional inlet pipe 1.

[0035] The upper part of the cone 8 is connected to the lower end of the cylinder 7, and the lower part is connected to the dust box 9;

[0036] The exhaust pipe 4 passes through the top of the cylinder 7 and is coaxially arranged with the cylinder 7, and the bottom of the exhaust pipe 4 is lower than the bottom of the inlet pipe 1;

[0037] The liquid inlet pipe 5 is located on the opposite side of the inlet pipe 1, penetrates the wall 3 above the cylinder 7 and then extends to the vicinity of the exhaust pipe 4. The liquid enters the cylinder 7 through the liquid inlet pipe 5 and the drainage holes on the top conical surface 2 of the cylinder 7 and forms a thin liquid film evenly on the inner wall of the cylinder 7. The liquid film covers the surface corresponding to the inlet airflow direction. The formed liquid film can not only reduce the erosion effect of the particles in the cyclone on the inner wall 3 of the cylinder 7, but also makes it easier for the particles to separate from the cyclone and flow into the dust collecting box.

[0038] The distance between each drainage hole of the cylinder and the top edge is 0.2mm~0.5mm.

[0039] Preferably, if Figure 4 As shown, the cross-sectional shape of the liquid inlet pipe 5 is circular.

[0040] like Figure 1As shown, the air inlet of the inlet pipe 1 of the utility model entering the cylindrical body 7 can also be symmetrically placed on the other side, so that the rotation direction of the airflow in the separator changes from clockwise to counterclockwise.

[0041] Preferably, if Figure 5 As shown, the outlet 6 of the liquid inlet pipe 5 of the utility model can also be designed as a Y-shaped outlet 61, so that the liquid is discharged from both sides of the exhaust pipe 4, and the liquid flows into the drainage hole of the top conical surface 2 of the cylinder more evenly.

[0042] Preferably, if Figure 6 As shown, the outlet 6 of the liquid inlet pipe 5 in the utility model can preferably be a circular sheathed pipe 62, and the liquid will flow out from the circular sheathed pipe 62 and rush to the circular cylinder at the end, so that the liquid will flow out along the wall of the circular ring, thereby making the liquid flow into the drainage hole on the top cone surface. This solution is more uniform than the Y-shaped outlet.

[0043] like Figure 3 As shown, the conical surface 2 at the top of the cylinder is a conical surface which is high in the middle and low around, and the angle formed by it with the horizontal plane is in the range of 5° to 10°.

[0044] The working principle and process of this utility model:

[0045] like Figure 1-Figure 6 As shown, the gas containing particles enters from the inlet pipe 1, and the coarse and fine particles easily collide with each other and condense into large particles in the contraction section of the cross section of the inlet pipe 1. Then, due to the Coanda effect, the airflow containing particles is more inclined to the wall of the cylinder 7, away from the inner vortex fluid, so that the separation efficiency is improved, and it rushes to the liquid film on the inner wall (while the gas containing particles enters from the inlet pipe 1, the liquid flows in from the liquid inlet pipe 5, enters the inner wall of the cylinder 7 through the drainage hole on the top conical surface of the cylinder 7, and forms a thin liquid film.)

[0046] The large particles in the air flow will lose inertia, break away from the air flow, and fall into the dust collecting box 9 at the bottom of the cone 8 along the wall.

[0047] The purified airflow moves upward due to the cone 8 and is discharged from the exhaust pipe 4 .

[0048] The liquid film formed on the inner wall surface can not only reduce the erosion effect of the particles in the cyclone on the inner wall surface of the cylinder, but also make it easier for the particles to separate from the cyclone and flow into the dust collecting box 9.

[0049] The utility model not only improves the separation efficiency, but also prolongs the service life of the cyclone separator.

Claims

1. A liquid film cyclone separator based on a Coanda effect inlet, comprising an inlet pipe, a cylinder, a cone, an exhaust pipe and a liquid inlet pipe, characterized in that: The top of the cylinder is a conical surface with a high middle and low sides, and a plurality of drainage holes are evenly distributed around the top of the conical surface; the side wall of the cylinder extends upward along the top to form a wall surface; The inlet pipe is connected to the cylinder, and the connection point is in an arc shape at a certain angle, forming a Coanda effect; The upper part of the cone is connected to the lower end of the cylinder, and the lower part of the cone is connected to the dust collecting box; The exhaust pipe passes through the top of the cylinder and is coaxially arranged with the cylinder, and the bottom of the exhaust pipe is lower than the bottom of the inlet pipe; The liquid inlet pipe is located on the opposite side of the inlet pipe, passes through the wall above the cylinder and then extends to the vicinity of the exhaust pipe. The liquid enters the cylinder through the liquid inlet pipe to form a liquid film, and the liquid film covers the surface corresponding to the inlet airflow direction.

2. The liquid film cyclone separator based on the Coanda effect inlet according to claim 1, characterized in that: The angle formed by the conical surface at the top of the cylinder and the horizontal plane ranges from 5° to 10°.

3. A liquid film cyclone separator based on a Coanda effect inlet according to claim 1, characterized in that: The distance between each drainage hole of the cylinder and the top edge is 0.2mm~0.5mm.

4. The liquid film cyclone separator based on the Coanda effect inlet according to claim 1, characterized in that: The cross-sectional shape of the liquid inlet pipe is circular.

5. The liquid film cyclone separator based on the Coanda effect inlet according to claim 1, characterized in that: The outlet of the liquid inlet pipe is Y-shaped, and the Y-shaped outlet is arranged outside the exhaust pipe.

6. The liquid film cyclone separator based on the Coanda effect inlet according to claim 1, characterized in that: The outlet of the liquid inlet pipe is in the form of a circular wrapped pipe, and the circular wrapped pipe is sleeved on the outside of the exhaust pipe.

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