Three-phase separator with structural improvements

Abstract

The application discloses a three-phase separator with improved structure, which comprises an inner cylinder, an outer cylinder composed of an inlet cylinder and an outlet cylinder, a sediment plate and a shear net device, the inlet cylinder is a conical cylinder structure with a smaller inner diameter at the lower end than that at the upper end, the outlet cylinder is a cylindrical cylinder structure, a water inlet is formed at the lower end of the inlet cylinder, the upper end of the inlet cylinder is sealingly and fixedly connected with the lower end of the outlet cylinder, a water outlet is formed on the sidewall of the upper end of the outlet cylinder, an exhaust port is formed on the upper end of the inner cylinder inserted into the outer cylinder, the exhaust port is higher than the water outlet, the lower end of the inner cylinder is higher than the water inlet, an annular gap with a radial dimension much smaller than the inner diameter of the inner cylinder is formed between the inner cylinder and the outer cylinder, the sediment plate in the annular gap is formed with an upwardly-inclined water passing slit, the shear net fixed in the inner cylinder is lower than the water outlet, and the shear net device is formed with a mesh structure by interlacing mesh wires, and the application realizes sufficient separation of water, mud and gas in the water outlet of the denitrification equipment, and effectively improves the stability and operation effect of the denitrification system.

Description

TECHNICAL FIELD

[0001] The present application relates to wastewater treatment technical field, in particular to a structure improved three-phase separator. BACKGROUND

[0002] The efficient denitrification process mainly uses denitrification tower and denitrification filter tank, and a large amount of nitrogen bubbles are generated in the denitrification reaction process. The activated sludge used in the denitrification reaction has biological viscosity, and the bubbles are stuck to the surface of the sludge during the upward process. Part of the sludge will form flocs and wrap the bubbles therein. The specific gravity of the sludge is reduced, the volume is expanded, a large amount of sludge floats up and flows to the tail end of the system with the water flow.

[0003] The traditional three-phase separator mainly separates sludge, water and gas by impacting the inclined plate during the upward process of the sludge. Such three-phase separator is difficult to achieve complete separation of sludge, water and gas in the denitrification system.

[0004] At present, the denitrification tower reactor and the upflow denitrification filter tank both face the problem of three-phase separation. The gas produced by the denitrification sludge floats up and separates from the reaction zone, which not only leads to the decrease of sludge concentration in the reaction zone and affects the removal capacity of nitrate nitrogen in the system, but also increases the SS concentration of the effluent if it is discharged with the produced water, thereby affecting the effluent quality.

[0005] Therefore, the separation effect of the three-phase separator will directly affect the stability and operation effect of the denitrification system. SUMMARY

[0006] In order to overcome the above defects, the present application provides a structure improved three-phase separator, which can fully realize the separation of sludge, water and gas in the biochemical reaction process, improve the stability and operation effect of the denitrification system, and improve the effluent quality.

[0007] The technical scheme adopted by the present application to solve its technical problems is: a three-phase separator with improved structure, comprising an inner cylinder, an outer cylinder, a sedimentation plate and a shear net device, the outer cylinder comprises a water inlet cylinder and a water outlet cylinder, the water inlet cylinder is a tapered cylinder structure with a smaller inner diameter at the lower end than at the upper end, and the water outlet cylinder is a cylindrical cylinder structure, the lower end of the water inlet cylinder forms a water inlet, and the upper end of the water inlet cylinder is sealingly and fixedly connected with the lower end of the water outlet cylinder to form an integrated structure, the upper end of the water outlet cylinder forms a water outlet on the side wall, the inner cylinder is inserted into the inner side of the outer cylinder, the upper end of the inner cylinder forms an exhaust port, and the height of the exhaust port is higher than that of the water outlet, the lower end of the inner cylinder is higher than the height of the water inlet at the lower end of the water inlet cylinder, an annular gap with a radial dimension much smaller than the inner diameter of the inner cylinder is formed between the inner cylinder and the outer cylinder, a plurality of sedimentation plates with a set angle with the vertical direction are arranged in the annular gap along the circumferential direction of the inner cylinder, and the two opposite side walls of the sedimentation plate are sealingly and fixedly connected with the outer side wall of the inner cylinder and the inner side wall of the outer cylinder, respectively, and the adjacent sedimentation plates form inclined upward water passing slits, the shear net device is fixedly installed on the inner side of the inner cylinder, and the height of the shear net is lower than the height of the water outlet, the shear net device comprises at least one layer of shear net, and the mesh wires of the shear net are staggered to form a mesh structure.

[0008] As a further improvement of the present application, the inner cylinder is concentrically inserted into the outer cylinder, and the lower end of the inner cylinder is inserted into the inner side of the upper end of the water inlet cylinder, and the gap between the outer side wall of the lower end of the inner cylinder and the inner side wall of the upper end of the water inlet cylinder forms the water inlet of the annular gap.

[0009] As a further improvement of the present application, the height of the water inlet cylinder is 1 / 2-2 times the inner diameter of the water inlet at the lower end of the water inlet cylinder, and the tapering angle of the water inlet cylinder is 60°-120°.

[0010] As a further improvement of the present application, the distance between the lower end edge of the inner cylinder and the inner side surface of the upper end of the water inlet cylinder in the horizontal direction and the vertical direction is 1 / 3-1 / 2 of the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder.

[0011] As a further improvement of the present application, a plurality of sedimentation plates are uniformly and spacedly arranged on the outer side wall of the lower end of the inner cylinder, and the projections of adjacent sedimentation plates on the horizontal plane overlap, the length H3 of the sedimentation plate along the inclined direction is 1 / 3-2 / 5 of the outer diameter of the water outlet cylinder, the length L3 of the overlapping part of adjacent sedimentation plates is 1 / 3-1 / 2 of the length of the sedimentation plate, and the angle between the sedimentation plate and the horizontal plane is 50°-60°.

[0012] As a further improvement of the present application, the shear net is formed by the intersection of two groups of parallel and spaced mesh wires, and a plurality of rhombic mesh holes with consistent size are formed, the obtuse angle M inside the rhombic mesh hole is 120°-160°, the short axis length L6 of the rhombic mesh hole is 1 / 150-1 / 80 of the inner diameter of the inner cylinder, and the long axis length L7 of the rhombic mesh hole is 1 / 80-1 / 40 of the inner diameter of the inner cylinder.

[0013] As a further improvement of the application, the wire of the shear net is a steel wire, and the wire diameter L4 is 1 / 2500-1 / 1500 of the inner diameter of the inner cylinder.

[0014] As a further improvement of the application, the shear net device comprises an upper shear net, a lower shear net and a connecting support, the upper and lower ends of the connecting support are fixedly connected with the upper and lower shear nets respectively to form an integrated structure, the upper and lower shear nets are arranged in parallel and spaced apart in the vertical direction, and the angles of the diamond-shaped mesh holes on the upper and lower shear nets are cross and staggered.

[0015] As a further improvement of the application, an annular inner convex blocking ring is fixedly arranged on the inner side wall of the inner cylinder, a positioning protrusion is arranged on the upper side of the annular inner convex blocking ring, the lower shear net of the shear net device is supported on the upper side of the annular inner convex blocking ring, and the edge of the lower shear net of the shear net device is provided with a positioning bayonet, the positioning protrusion on the annular inner convex blocking ring can be clamped in the positioning bayonet of the lower shear net, the shear net device further comprises a pressing ring, the pressing ring can be inserted into the inner side of the inner cylinder, the lower end of the pressing ring abuts against the upper side edge of the upper shear net, the upper end of the pressing ring is provided with a horizontal cover plate, the horizontal cover plate covers the upper end edge of the inner cylinder, and the exhaust hole is arranged on the horizontal cover plate.

[0016] As a further improvement of the application, an annular cover is formed on the upper end of the inner cylinder, the annular cover can be sleeved on the outer side of the upper end of the outer cylinder, the bottom surface of the annular cover is stopped on the upper end surface of the outer cylinder, and a backwater outlet with a height lower than that of the water outlet is further arranged on the side wall of the water outlet cylinder of the outer cylinder, and the backwater outlet is communicated with the inside of the denitrification equipment through a pipeline.

[0017] The application has the following beneficial effects: the water outlet of the denitrification equipment enters the three-phase separator through the water inlet cylinder, the mud-water mixture is impacted up and down due to the rapid reduction of the flow rate at the water inlet, and the mud-water mixture is disturbed violently in the water flow, so that 60%-75% of the floating mud is preliminarily separated and settled, the sludge entering the three-phase separator is separated from the water and gas because the inner diameter of the inner cylinder is much larger than the radial size of the annular gap formed between the inner cylinder and the outer cylinder, and the annular gap is further divided into a plurality of elongated water passage slits by the sedimentation plate, most of the floating mud enters the inner cylinder, and most of the flocculent sludge is cut by the wire after passing through the shear net of the shear net device, so that the mud and gas are separated, the sludge is settled and backflows into the denitrification equipment, a small amount of sludge enters the annular gap between the inner cylinder and the outer cylinder, is impacted on the sedimentation plate and is settled to realize mud-water separation, the water, mud and gas in the water outlet of the denitrification equipment are fully separated through the three separation systems, the sludge fully backflows into the denitrification equipment, the stability and operation effect of the denitrification system are effectively improved, and the water outlet is clear. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a front view of the present invention;

[0019] Figure 2 is a perspective view of the present invention;

[0020] Figure 3 is a schematic diagram of the structural principle of the present invention;

[0021] Figure 4 is a schematic diagram of the separation principle of sludge in the first separation system;

[0022] Figure 5 is a perspective view of the shearing net device of the present invention;

[0023] Figure 6 is a front view of the shearing net device of the present invention;

[0024] Figure 7 is a schematic diagram of the lower shearing net of the present invention;

[0025] Figure 8 is a Figure 7 enlarged view of part A;

[0026] Figure 9 is a schematic diagram of the staggered arrangement of the upper shearing net and the lower shearing net;

[0027] Figure 10 is a perspective view of the inner cylinder of the present invention;

[0028] Figure 11 is a front view of the inner cylinder of the present invention;

[0029] Figure 12 is a bottom view of the inner cylinder of the present invention;

[0030] Figure 13 is a diagram of the running path of the upward sludge in the water passage slit between the sedimentation plates;

[0031] Figure 14 is a front view of the sedimentation plate of the present invention. DETAILED DESCRIPTION

[0032] Embodiment: a structure improved three-phase separator, including inner cylinder 1, outer cylinder, sedimentation plate 4 and shear net device 5, the outer cylinder includes water inlet cylinder 2 and water outlet cylinder 3, the water inlet cylinder 2 is the tapered cylinder structure with the inner diameter of the lower end smaller than the inner diameter of the upper end, the water outlet cylinder 3 is the cylindrical cylinder structure, the water inlet cylinder 2 lower end forms water inlet 6, the water inlet cylinder 2 upper end and the water outlet cylinder 3 lower end sealing fixed connection form integrated structure, the water outlet cylinder 3 upper end side wall forms water outlet 7, the inner cylinder 1 is inserted in the inner side of the outer cylinder, the inner cylinder 1 upper end forms exhaust port 8, and the exhaust port 8 height is higher than the water outlet 7 height, the inner cylinder 1 lower end height is higher than the water inlet 6 height of the water inlet cylinder 2 lower end, the annular gap 9 with the radial dimension much smaller than the inner diameter of the inner cylinder 1 is formed between the inner cylinder 1 and the outer cylinder, a plurality of sedimentation plates 4 with a set angle with the vertical direction are arranged in the annular gap 9 along the circumferential direction of the inner cylinder 1, and the two opposite side walls of the sedimentation plate 4 are sealingly connected with the outer side wall of the inner cylinder 1 and the inner side wall of the outer cylinder, respectively, the adjacent sedimentation plates 4 form the water passing narrow slit inclined upward, the shear net device 5 is fixedly installed on the inner side of the inner cylinder 1, and the shear net height is lower than the water outlet 7 height, the shear net device 5 includes at least one layer of shear net, and the mesh of the shear net is staggered to form a mesh structure.

[0033] The three-phase separator forms the first separation system 23 at the water inlet cylinder 2, the second separation system 24 at the sedimentation plate 4, and the third separation system 25 at the shear net device 5.

[0034] In use, the lower end of the water inlet cylinder 2 is sealingly connected with the water outlet end of the denitrification equipment, the water flow with floating sludge flows through the three-phase separator, the water flow first passes through the first separation system (as shown in Figure 4 The water flow in the denitrification equipment has a certain upward flow rate before reaching the three-phase separator. Since the first separation system is a tapered flared structure with the inner diameter of the lower end smaller than the inner diameter of the upper end, after the water flow enters the water inlet cylinder 2, the originally axial flow of the water flow is diverged after the flaring, the tangential flow rate is increased, and the axial flow rate is rapidly reduced. Further, the water flow with large axial flow rate at the lower end and the water flow with small axial flow rate at the upper end collide violently at the first separation system, so that the floating sludge in the water flow collides violently, the bubbles are scattered, and the specific gravity of the sludge increases as the gas in the sludge is discharged. The sludge slowly settles under the action of gravity and returns to the denitrification equipment.

[0035] In the first separation system stage, the unseparated sludge is mostly tightly wrapped small particle sludge, which continues to go up with the water flow, crossing the separation boundary 10 at the upper end of the first separation system. Due to the annular gap 9 formed between the outer cylinder and the inner cylinder 1, and the radial dimension of the annular gap 9 being much smaller than the inner diameter of the inner cylinder 1, and the formation of the elongated water passage gap by the sedimentation plate 4 in the annular gap 9, the resistance along the space inside the inner cylinder 1 is much smaller than the resistance along the water passage gap, and most of the gas sludge enters the third separation system along the inner cylinder 1. When the upward gas sludge passes through the shear net device 5, the sludge floc will hit the shear net and be cut by the net wire, and the floc will be broken down and the wrapped bubbles will be discharged. The specific gravity of the sludge increases as the bubbles are discharged, and the sludge begins to settle downward, and the bubbles rise and are discharged from the gas outlet 8 at the upper end of the inner cylinder 1. After being cut by the shear net, most of the floc sludge will settle and return to the denitrification equipment, and only a small amount of small particle sludge will be retained in the third separation system, which can be returned to the denitrification equipment by periodic water flushing.

[0036] Since the water outlet 7 of the three-phase separator is higher than the shear net device 5, the unseparated sludge in the third separation system and the floating sludge that does not enter the third separation system enter the second separation system along the water inlet gap. Due to the existence of the inclined sedimentation plate 4 in the second separation system, the sludge will hit the lower surface of the sedimentation plate 4 when it goes up, and the sludge hitting the sedimentation plate 4 will stick to the lower surface of the sedimentation plate 4 and slowly settle down along the sedimentation plate 4 due to its own weight, achieving the effect of sludge-water separation.

[0037] After the sludge in the denitrification equipment is separated by the three stages of the three-phase separator of the present application, the sludge-water-gas separation effect is excellent, and the system water is clear.

[0038] The inner cylinder 1 is concentrically inserted into the outer cylinder, and the lower end of the inner cylinder 1 is inserted into the inner side of the upper end of the water inlet cylinder 2. The gap between the lower end of the inner cylinder 1 and the inner side wall of the upper end of the water inlet cylinder 2 forms the water inlet 6 of the annular gap 9. The inner cylinder 1 and the water outlet cylinder 3 are preferably cylindrical cylinders, and the water inlet cylinder 2 is a conical cylinder. In addition, the inner cylinder 1 and the water outlet cylinder 3 can also be square cylinders, and the water inlet cylinder 2 can be a square conical cylinder, etc., which can be designed by those skilled in the art as needed.

[0039] The height of the water inlet cylinder 2 is 1 / 2 to 2 times the inner diameter of the inlet at the lower end of the water inlet cylinder 2, and the angle of the conical flared portion of the water inlet cylinder 2 is 60° to 120°. The degree of turbulence of the water flow at the first separation system is represented by the disturbance degree VRMS. The height H1 of the water inlet cylinder 2 and the angle θ1 of the flared portion are calculated through optimized design, so that the disturbance degree VRMS at the flared portion reaches a peak value, and the degree of impingement flow reaches a maximum. When the disturbance degree VRMS is at the peak value, the impingement of the floating sludge is very violent, and 60% to 75% of the floating sludge can be separated and settled in the first separation system. The height of the water inlet cylinder 2 is determined according to the viscosity and density of the settled sludge, and the angle of the conical flared portion of the water inlet cylinder 2 is determined according to the upward flow velocity of the settled sludge. According to the viscosity, density and upward flow velocity of the sludge to be settled, the height H1 of the water inlet cylinder 2 and the angle θ1 of the flared portion are calculated through optimized design, and the two parameters form two curves of change. The intersection point of the two curves is the highest point of the disturbance degree VRMS, the degree of impingement flow is the most violent, and the sludge settlement effect is the best.

[0040] The distance between the lower end edge of the inner cylinder 1 and the inner side surface of the upper end of the water inlet cylinder 2 in the horizontal direction and the vertical direction is 1 / 3 to 1 / 2 of the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder 1. The distance between the lower end edge of the inner cylinder 1 and the inner side surface of the upper end of the water inlet cylinder 2 in the horizontal direction is the radial dimension L2 of the water inlet 6 in the horizontal direction, and the distance between the lower end edge of the inner cylinder 1 and the inner side surface of the upper end of the water inlet cylinder 2 in the vertical direction is the axial dimension H2 of the water inlet 6 in the vertical direction. The two dimensions are calculated through optimized design, so that the resistance along the way of the sludge entering the third separation system is small, and most of the sludge and gas enter the third separation system for sludge-gas separation.

[0041] The plurality of sedimentation plates 4 are uniformly and spacedly arranged on the outer side wall of the lower end of the inner cylinder 1, and the projections of adjacent sedimentation plates 4 on the horizontal plane overlap. The length H3 of the sedimentation plate 4 along the inclined direction thereof is 1 / 3 to 2 / 5 of the outer diameter of the water outlet cylinder 3, and the length L3 of the overlapping portion of adjacent sedimentation plates 4 is 1 / 3 to 1 / 2 of the length of the sedimentation plate 4. The angle between the sedimentation plate 4 and the horizontal plane is 50° to 60°. The length of the sedimentation plate 4 is determined according to the viscosity and density of the settled sludge, and the inner arc edge angle X° and the outer arc edge angle Y° of the sedimentation plate 4 and the inner cylinder 1 and the outer cylinder are determined according to the outer diameter of the inner cylinder 1 and the inner diameter of the outer cylinder. The sedimentation plates 4 are uniformly and spacedly arranged in a ring-shaped space at the lower end of the inner cylinder 1 (as shown in Figure 11 Since there is a vertical overlap between adjacent sedimentation plates 4, the sludge entering the second separation system rises along the inclined water passage between the sedimentation plates 4, and the rising sludge will inevitably impinge on the sedimentation plates 4 and deposit along the sedimentation plates due to its own weight. The running path of the rising sludge in the water passage between the sedimentation plates 4 is as shown in Figure 13 The above structure can effectively prevent the sludge from rising to the water outlet 7 without depositing on the sedimentation plates 4.

[0042] The shear net is formed by two groups of parallel and spaced net wires intersecting to form a plurality of uniform diamond-shaped net holes 11, the obtuse angle M inside the diamond-shaped net hole 11 is 120°-160°, the short axis length L6 of the diamond-shaped net hole 11 is 1 / 150-1 / 80 of the inner diameter of the inner cylinder 1, and the long axis length L7 of the diamond-shaped net hole 11 is 1 / 80-1 / 40 of the inner diameter of the inner cylinder 1. The net wires of the shear net intersect to form diamond-shaped net holes 11, and the included angle between the intersecting net wires is selected to be 120°-160° after detailed calculation, at which time the cutting efficiency of the shear surface is higher (as shown in Figure 8 、 Figure 9 The short axis length and the long axis length of the diamond-shaped net hole 11 are designed and calculated in detail, which are 1 / 150-1 / 80 and 1 / 80-1 / 40 of the inner diameter of the inner cylinder 1 respectively, at which time the cutting efficiency of the shear surface is higher (as shown in Figure 8 、 Figure 9 .

[0043] The net wire 12 of the shear net is a steel wire, and the diameter L4 of the net wire 12 is 1 / 2500-1 / 1500 of the inner diameter of the inner cylinder 1. The very fine steel wire is used as the net wire 12 of the shear net, which is very sharp. And because the steel wire is woven into a diamond-shaped net hole 11, the stable structure of the triangle makes the steel wire remain in a stable state without deformation, forming a high-strength shear surface, and the air mud floating through the shear net will be easily cut open whether the rising speed is fast or slow, and the air bubbles are excluded.

[0044] The shear net device 5 includes an upper shear net 13, a lower shear net 14, and a connecting bracket 15, the upper and lower ends of the connecting bracket 15 are respectively fixedly connected with the upper shear net 13 and the lower shear net 14 to form an integral structure, the upper shear net 13 and the lower shear net 14 are arranged in parallel and spaced apart in the vertical direction, and the diamond-shaped net holes 11 on the upper shear net 13 and the lower shear net 14 are arranged in angle intersection. The larger floc that has not been degassed through the lower shear net 14 will inevitably hit the upper shear net 13 during the floating process, realizing degassing and sedimentation, and the height L5 of the connecting bracket 15 is generally set to 1 / 15-1 / 10 of the inner diameter of the inner cylinder 1, at which time the mud-air separation effect of the shear net is better.

[0045] The inner cylinder 1 is provided with a ring-shaped inner convex blocking ring 16 on the inner side wall, and the upper side of the ring-shaped inner convex blocking ring 16 is provided with an axial upward positioning protrusion 17. The lower layer of the shearing net device 5 is supported on the upper side of the ring-shaped inner convex blocking ring 16, and the edge of the lower layer of the shearing net device 5 is provided with a positioning bayonet 18. The positioning protrusion 17 on the ring-shaped inner convex blocking ring 16 can be clamped in the positioning bayonet 18 of the lower layer of the shearing net 14. The shearing net device 5 further comprises a pressing ring 19 which can be inserted into the inner side of the inner cylinder 1. The lower end of the pressing ring 19 abuts against the upper side edge of the upper layer of the shearing net 13, and the upper end of the pressing ring 19 is provided with a horizontal cover plate 20 which covers the upper end edge of the inner cylinder 1. The exhaust hole is located on the horizontal cover plate 20. The shearing net device 5 is vertically supported by the ring-shaped inner convex blocking ring 16 on the inner side of the inner cylinder 1, and then the circumferential direction positioning of the shearing net device 5 is realized by the insertion of the positioning protrusion 17 and the positioning bayonet 18. Finally, the pressing ring 19 is pressed and positioned. This structure facilitates the disassembly of the shearing net device 5 from the inner cylinder 1 for cleaning and maintenance, and facilitates the installation in the inner cylinder 1 after processing. In order to further improve the convenience of installation and disassembly, the best is to set a handle 26 on the upper end of the pressing ring 19 and on the upper side of the upper layer of the shearing net 13, which is used for grabbing during installation and disassembly. The installation structure of the above-mentioned shearing net device 5 is simple and convenient for actual operation. In addition, the shearing net device 5 can also be installed on the inner side of the inner cylinder 1 by other ways, such as welding, screw connection, buckle connection, etc. These are equivalent replacement structures that can be easily thought of by those skilled in the art according to the present application, and all belong to the protection scope of the present application.

[0046] The inner cylinder 1 is provided with a ring-shaped cover 21 at the upper end, which can be sleeved on the outer side of the outer cylinder. The bottom surface of the ring-shaped cover 21 is stopped on the upper end surface of the outer cylinder. The outer cylinder is further provided with a backwater outlet 22 on the side wall of the water outlet cylinder 3, which is lower than the height of the water outlet 7. The backwater outlet 22 is communicated with the inside of the denitrification equipment through a pipeline. The upper end of the three-phase separator is closed by the ring-shaped cover 21 to prevent pollutants from falling in and to avoid safety hazards.

Claims

1. A three-phase separator with improved structure, characterized in that: The utility model comprises an inner cylinder (1), an outer cylinder, a sedimentation plate (4) and a shearing net device (5), wherein the outer cylinder comprises a water inlet cylinder (2) and a water outlet cylinder (3), wherein the water inlet cylinder is a conical cylinder structure with an inner diameter of the lower end smaller than the inner diameter of the upper end, and the water outlet cylinder is a cylindrical cylinder structure, wherein a water inlet (6) is formed at the lower end of the water inlet cylinder, the upper end of the water inlet cylinder is sealed and fixedly connected with the lower end of the water outlet cylinder to form an integral structure, and a water outlet (7) is formed on the side wall of the upper end of the water outlet cylinder, the inner cylinder is inserted into the inner side of the outer cylinder, an exhaust port (8) is formed at the upper end of the inner cylinder, and the height of the exhaust port is higher than the height of the water outlet, and the height of the lower end of the inner cylinder is higher than the height of the water inlet at the lower end of the water inlet cylinder, and an annular gap (9) with a radial dimension much smaller than the inner diameter of the inner cylinder is formed between the inner cylinder and the outer cylinder, and a plurality of sedimentation plates with a set angle to the vertical direction are arranged along the inner cylinder. The inner cylinder is arranged in a circumferential direction at intervals in the annular gap, and the two opposite side walls of the sedimentation plate are respectively sealed and fixedly connected to the outer wall of the inner cylinder and the inner wall of the outer cylinder, and an inclined upward water-passing slit is formed between adjacent sedimentation plates. The shearing net device is fixedly installed on the inner side of the inner cylinder, and the height of the shearing net is lower than the height of the water outlet. The shearing net device includes at least one layer of shearing net, the mesh wires of the shearing net are staggered to form a mesh structure, and the shearing net is formed by two groups of parallel and spaced mesh wires crossing to form a plurality of diamond meshes (11) of the same size, the obtuse angle M of the inner side of the diamond mesh is 120°-160°, the short axis length L6 of the diamond mesh is 1 / 150-1 / 80 of the inner diameter of the inner cylinder, and the long axis length L7 of the diamond mesh is 1 / 80-1 / 40 of the inner diameter of the inner cylinder.

2. The three-phase separator with improved structure according to claim 1, characterized in that: The inner cylinder is concentrically inserted into the outer cylinder, and the lower end of the inner cylinder is inserted inside the upper end of the water inlet cylinder. The gap between the circumferential outer wall of the lower end of the inner cylinder and the inner wall of the upper end of the water inlet cylinder forms an annular gap water inlet.

3. The three-phase separator with improved structure according to claim 1 or 2, characterized in that: The height of the water inlet cylinder is 1 / 2 to 2 times the inner diameter of the inlet at the lower end of the water inlet cylinder, and the conical expansion angle of the water inlet cylinder is 60° to 120°.

4. The three-phase separator with improved structure according to claim 1, characterized in that: The distances between the lower edge of the inner cylinder and the inner surface of the upper end of the water inlet cylinder in the horizontal and vertical directions are both 1 / 3 to 1 / 2 of the difference between the inner diameter of the outer cylinder and the outer diameter of the inner cylinder.

5. The three-phase separator with improved structure according to claim 1, characterized in that: Several sedimentation plates are evenly spaced and arranged on the outer wall of the lower end of the inner cylinder, and the projections of adjacent sedimentation plates on the horizontal plane overlap. The length H3 of the sedimentation plate along its inclined direction is 1 / 3 to 2 / 5 of the outer diameter of the water outlet cylinder, and the length L3 of the overlapping part of adjacent sedimentation plates is 1 / 3-1 / 2 of the length of the sedimentation plate. The angle between the sedimentation plate and the horizontal plane is 50° to 60°.

6. The three-phase separator with improved structure according to claim 1, characterized in that: The mesh wire (12) of the shearing net is a steel wire, and the mesh wire diameter L4 is 1 / 2500-1 / 1500 of the inner diameter of the inner cylinder.

7. The three-phase separator with improved structure according to claim 1, characterized in that: The shearing net device comprises an upper shearing net (13), a lower shearing net (14) and a connecting bracket (15), wherein the upper and lower ends of the connecting bracket are respectively fixedly connected to the upper shearing net and the lower shearing net to form an integral structure, the upper shearing net and the lower shearing net are arranged parallel and spaced apart in the vertical direction, and the diamond meshes on the upper shearing net and the lower shearing net are arranged at cross angles.

8. The three-phase separator with improved structure according to claim 7, characterized in that: A ring-shaped inner convex retaining ring (16) is fixedly provided on the inner side wall of the inner cylinder, and an axially upward positioning protrusion (17) is provided on the upper side of the ring-shaped inner convex retaining ring. The lower shearing net of the shearing net device is supported on the upper side of the ring-shaped inner convex retaining ring, and a positioning bayonet (18) is provided on the edge of the lower shearing net of the shearing net device. The positioning protrusion on the ring-shaped inner convex retaining ring can be clamped in the positioning bayonet of the lower shearing net. The shearing net device also includes a pressure ring (19). The pressure ring can be inserted into the inner side of the inner cylinder, and the lower end of the pressure ring is tightly against the upper edge of the upper shearing net. The upper end of the pressure ring is provided with a horizontal cover plate (20). The horizontal cover plate covers the upper edge of the inner cylinder, and the exhaust hole is located on the horizontal cover plate.

9. The three-phase separator with improved structure according to claim 1, characterized in that: The upper end of the inner cylinder is formed with a ring-shaped cover (21), which can be sleeved on the outer side of the upper end of the outer cylinder, and the bottom surface of the ring-shaped cover is stopped on the upper end surface of the outer cylinder. The side wall of the water outlet cylinder of the outer cylinder is also provided with a return water port (22) whose height is lower than the height of the water outlet. The return water port is connected to the interior of the denitrification equipment through a pipeline.

Images