Vertical multi-pass co-current flow sedimentation separation device

Abstract

The present invention relates to a vertical multi-pass co-current flow sedimentation separation device, comprising a box, in which a plurality of sedimentation separation units connected in sequence and in opposite directions are arranged in the height direction, the structure of the sedimentation separation unit comprises a sedimentation plate arranged downwardly in a horizontal direction, the upstream side and both sides of which are in contact with the inner wall of the box, the two adjacent sedimentation plates are inclined in opposite directions, a sediment collection tank and a vertical overflow baffle are arranged at the edge of the downstream side of the sedimentation plate, and a sediment discharge pipe is connected to the collection tank; a liquid inlet pipe and a liquid outlet pipe are respectively arranged at the top and bottom of the box, and the mixture flows through different units in sequence for sedimentation separation after entering from the inlet pipe. The light phase and the heavy phase flow in the same direction, which solves the disturbance problem between the light and heavy phases caused by increasing the sedimentation area with multi-layer partitions, reduces the floor space of the sedimentation equipment, and improves the sedimentation separation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of flocculation mixture sedimentation separation, in particular to a vertical multi-pass co-current sedimentation separation device. Background Art

[0002] Sedimentation separation of mixtures is a technical means often used in industrial production and in the treatment of various sewage, wastewater, waste gas, waste residue, etc. Commonly used separation equipment includes sedimentation tanks, sedimentation tanks, multi-layer sedimentation chambers, etc. For systems with large density differences or particle size differences between the phases to be separated, the efficiency of sedimentation separation is high, but for systems with small density differences or particle size differences between the phases to be separated, there are technical problems such as low relative movement speed of the two phases, low separation efficiency, large sedimentation area and long sedimentation time, resulting in a large equipment footprint.

[0003] In the prior art, methods and equipment for improving sedimentation separation efficiency and reducing equipment footprint, such as inclined tube / inclined plate sedimentation tanks, baffle flocculation tanks, baffle flocculation tanks, etc., have improved separation efficiency. However, since the continuous phase and the dispersed phase flow in opposite or interlaced directions during the flow process, there is a large disturbance between them, which often causes the settled floccules to be lifted up again or offset the settling speed of the floccules. Therefore, there are still problems such as low separation efficiency, large footprint, and low production capacity. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured vertical multi-pass co-current sedimentation separation device, in which the mixture to be separated flows through a plurality of sedimentation separation units arranged alternately in the vertical direction in sequence, and the continuous phase and the sedimentation phase flow in the same direction in each unit, avoiding the disturbance caused by reverse flow and deflection, thereby greatly improving the separation effect, and can be used for the sedimentation separation of flocculation mixtures that are difficult to separate by sedimentation, reducing the sedimentation separation time and improving production efficiency. At the same time, the flow channel cross-sectional area of ​​each separation unit gradually expands, and the flow velocity gradually decreases, which is more conducive to sedimentation separation, and an overflow baffle is set at the end of the separation unit, which can further intercept particles whose height is lower than the baffle, further improving the separation effect.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A vertical multi-pass co-current flow sedimentation separation device comprises a box body, wherein a plurality of sedimentation separation units connected in sequence are arranged in the height direction of the box body, and the flow directions of two sedimentation separation units adjacent to each other are opposite, and the structure of each sedimentation separation unit is as follows: comprising a sedimentation plate arranged downwardly in a horizontal direction, wherein one side and both sides of the upstream of the sedimentation plate are in contact with the inner wall of the box body, a sediment collection tank is arranged at the downstream side of the sedimentation plate, and a vertical overflow baffle is arranged at the downstream edge of the sedimentation collection tank; the inclination directions of the sedimentation plates of the two sedimentation separation units adjacent to each other are opposite, so that the flow channel cross-sectional area of ​​each sedimentation separation unit increases gradually along the flow direction; a liquid inlet pipe and a liquid outlet pipe are respectively arranged at the top and the bottom of the box body, and the solid-containing liquid flows into the box body from the liquid inlet pipe, and after being sedimented and separated by a plurality of sedimentation separation units in sequence along the height direction, the clear liquid flows out from the liquid outlet pipe; the sediment collection tank is connected to a sediment discharge pipe fixed on the box body, and the solids settled in each unit are collected in the sediment collection tank and then discharged from the sediment discharge pipe.

[0007] The box body is a cube or a cuboid.

[0008] The width of the overflow baffle and the width of the sedimentation plate are the same as the width of the box body. The overflow baffle and the sedimentation plate are tightly connected to the inner wall of the box body respectively. The overflow baffles of two adjacent sedimentation separation units are arranged in parallel and distributed on both sides of the box body respectively.

[0009] The upper edge of the overflow baffle is determined according to the vertical height of the inclined settling plate of the previous separation unit and the height of the overflow baffle itself according to the actual process conditions.

[0010] It also includes a water distribution pipe, which is located at the top sedimentation and separation unit (the top side of the box body), one side wall of the water distribution pipe is connected to the liquid inlet pipe, and the other side wall is evenly distributed along the axial direction with multiple water distribution ports, through which the flocculant-containing liquid is input into the top sedimentation and separation unit.

[0011] The height of the water distribution pipe can be determined according to the actual process conditions.

[0012] The bottom plate of the bottom sedimentation unit is the bottom plate of the box, and a corresponding sediment collection tank is also provided on its downstream side, and its outlet end is also connected to a corresponding sediment discharge pipe; the liquid outflow pipe is arranged on the side wall of the box of the bottom sedimentation separation unit.

[0013] In the gradually expanding flow channel, the flow rate of the mixture gradually decreases, which is conducive to the sedimentation and separation of heavy phase solid particles; the liquid and small particles that cannot settle flow obliquely upward until they pass through the overflow baffle and then flow vertically downward into the next unit for further separation, while the solid particles that settle on the inclined settling plate and the solid particles blocked by the overflow baffle slowly flow into the sediment collection tank at the bottom of the settling plate and are discharged from the sediment discharge pipe on the side. In this process, the light phase and the heavy phase flow in the same direction, and the light phase flows from the top of the baffle into the next separation unit, which will not disturb the sedimentation of the heavy phase particles.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present invention has a compact and reasonable structure and is easy to operate. It uses a plurality of vertically arranged sedimentation separation units in opposite directions to achieve co-current sedimentation separation, and solves the disturbance problem between the phases to be separated caused by increasing the sedimentation area with multi-layer partitions, so that the contradiction between increasing the sedimentation area, extending the sedimentation time and reducing the separation efficiency due to fluid disturbance is solved; the gradually expanding flow channel of the separation unit is formed by alternately arranged inclined sedimentation plates, so that the flow rate of the mixture is gradually reduced, and the sedimentation separation efficiency is improved; the sedimentation separation unit is divided by setting an overflow baffle, which not only reduces the disturbance effect of the change in the flow direction of the light phase on the sedimentation of the heavy phase, but also can further intercept the solid particles in the light phase flow whose height is lower than the baffle height, and further improve the separation efficiency; the sedimentation units are stacked vertically, which greatly reduces the floor space of the sedimentation equipment; the above design greatly improves the sedimentation separation efficiency. The present invention also has the following advantages:

[0016] The mixture to be separated flows vertically through different units in turn. In each unit, the continuous phase and the sedimentation phase flow in the same direction, avoiding disturbances caused by reverse flow and deflection. The bottom plate of the unit is an inclined plate in the same direction as the flow direction. After the sedimentation phase settles to the bottom plate, it automatically slides down to the sediment collection tank at the bottom of the inclined plate and is discharged or extracted by the sediment discharge pipe. The light phase flows in the gradually expanding flow channel formed by two inclined plates in opposite directions, and the speed gradually decreases, which is conducive to the sedimentation of the sedimentation phase. After the light phase flows to the end of the flow channel, it flows into the next unit through the overflow baffle at the end and flows for the next level of sedimentation separation. After multiple sedimentation separations, the original mixture is separated more thoroughly.

[0017] In the device of the present invention, the sedimentation separation units are arranged in the vertical direction rather than the horizontal direction, which greatly increases the sedimentation area and saves the floor space. According to the shallow pool theory of sedimentation separation, the sedimentation separation efficiency is proportional to the sedimentation area and has nothing to do with the height. Therefore, the height of the sedimentation separation unit is relatively small, and more sedimentation separation units can be arranged within the same device height. The fluid flows repeatedly between multiple sedimentation separation units, and the separation efficiency is doubled. The light phase and heavy phase to be separated flow in the unit in the same direction. The settled heavy phase material is discharged from the sediment discharge pipe at the bottom of the inclined plate, and the light phase flows to the next unit from the overflow baffle at the top of each unit. The light phase and the heavy phase will not affect each other, causing disturbance and back mixing of each other, so the separation efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the internal structure of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the implementation state of the present invention.

[0020] Figure 3 It is a top view of the installation structure of the top sedimentation separation unit of the present invention.

[0021] Figure 4 It is a side view of the installation structure of the top sedimentation separation unit of the present invention.

[0022] Among them: 1. Box body; 2. Liquid inlet pipe; 3. Liquid outlet pipe; 4. Sedimentation plate; 5. Overflow baffle; 6. Sediment discharge pipe; 7. Sediment collection tank; 8. Water distribution pipe; 81. Water distribution outlet. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0024] like Figure 1-Figure 4As shown, the vertical multi-pass co-current flow sedimentation separation device of this embodiment comprises a box body 1, in which a plurality of sedimentation separation units connected in sequence are arranged in the height direction, and the flow directions of two upper and lower adjacent sedimentation separation units are opposite, and the structure of each sedimentation separation unit is as follows: it comprises a sedimentation plate 4 arranged obliquely downward in the horizontal direction, and the upstream side and both sides of the sedimentation plate 4 are in contact with the inner wall of the box body 1, and a sediment collection tank 7 is arranged on the downstream side of the sedimentation plate 4, and a vertical overflow baffle 5 is arranged on the downstream side of the sedimentation plate 4; the two upper and lower adjacent sedimentation separation units are arranged in a vertical direction. The settling plates 4 of the elements are inclined in opposite directions, so that the flow channel cross-sectional area of ​​each settling separation unit gradually increases along the flow direction; a liquid inlet pipe 2 and a liquid outlet pipe 3 are respectively provided at the top and bottom of the box body 1, and the solid-containing liquid flows into the box body 1 from the liquid inlet pipe 2, and after being settling and separated by multiple settling separation units in sequence along the height direction, the clear liquid flows out from the liquid outlet pipe 3; the sediment collecting tank 7 is connected to the sediment discharge pipe 6 fixed on the box body 1, and the settled solids in each unit are collected in the sediment collecting tank 7 and then discharged from the sediment discharge pipe 6.

[0025] The width of the overflow baffle 5 and the width of the sedimentation plate 4 are the same as the width of the box body 1. The overflow baffle 5 and the sedimentation plate 4 are tightly connected to the inner wall of the box body 1 respectively. The overflow baffles 5 of two adjacent sedimentation separation units are arranged in parallel and are distributed on both sides of the box body 1 respectively.

[0026] It also includes a water distribution pipe 8, which is located on one side of the top of the box body 1. One side wall of the water distribution pipe 8 is connected to the liquid inlet pipe 2, and the other side wall is evenly distributed with multiple water distribution ports 81 along the axial direction. The solid-containing liquid is input into the top sedimentation separation unit through the multiple water distribution ports 81.

[0027] The bottom plate of the bottom sedimentation unit is the bottom plate of the box body 1, and a corresponding sediment collection tank 7 is also provided on its downstream side, and its outlet end is also connected to a corresponding sediment discharge pipe 6; the liquid outflow pipe 3 is arranged on the side wall of the box body 1 located at the bottom sedimentation separation unit.

[0028] The box body 1 is a cube or a cuboid.

[0029] During the specific implementation process, the height of the top of the overflow baffle 5 from the upper sedimentation plate 4 can be determined according to the specific process conditions; the heights of the inlet pipe 2 and the water distribution pipe 8 correspond to each other; the height of the overflow baffle 5 of each unit is determined by the specific process conditions; the height of each sedimentation and separation unit can be equal, or it can be unequal according to the specific process requirements, for example, from top to bottom, the height of each sedimentation and separation unit becomes smaller and smaller.

[0030] During the working process of the present invention, Figure 2As shown, the liquid containing solids or floccules flows from the liquid inlet pipe 2 into the water distribution pipe 8, and evenly flows into a sedimentation separation unit at the top of the box body 1 through the water distribution of multiple water distribution ports 81 evenly arranged in a direction perpendicular to the flow direction. The sedimentation plate 4 is inclined downward along the flow direction, so that the cross-sectional area of ​​the flow channel gradually increases, the flow rate slows down, and the solid phase or floccules settle on the sedimentation plate 4 along the direction of the solid line with the arrow arc, and slowly slide down along the inclined sedimentation plate into the sediment collection tank 7, and are discharged to the outside of the box body 1 through the sediment discharge pipe 6 (a pump or other device can be used). After a sedimentation The liquid flows along the direction of the dotted line with the arrow, overflows from the top of the overflow baffle 5 to the sedimentation plate 4 of the next sedimentation separation unit. The top of the overflow baffle 5 can be a straight line or a serrated shape; the sedimentation plate 4 of the next sedimentation separation unit is still arranged to be inclined downward along the flow direction, and the cross-sectional area of ​​the flow channel gradually increases, and the flow rate slows down, completing the same sedimentation process as in the first sedimentation separation unit. The solid content of the solid-containing liquid is further reduced until the bottom sedimentation separation unit. After multiple reciprocating flows and sedimentation, the solid phase in the solid-containing liquid is separated, and the clear liquid is discharged from the liquid outlet pipe 3 outside the box 1. Specific embodiment:

[0032] A surface polluted water, COD is 37mg / L, turbidity is 21.6NTU, SS is 23mg / L. Add 1‰ volume fraction of polyferrous sulfate solution (mass concentration 10%), stir for 10 minutes to form a uniform flocculation mixture, introduce into the device of the present invention, after repeated co-current separation, clear water flows out from the bottom sedimentation separation unit, and flocculated sludge is discharged from the sedimentation discharge pipe 6 of each sedimentation separation unit. The effluent is clear and transparent, COD is 8.8mg / L, turbidity and SS are both 0.

[0033] During the above-mentioned sedimentation process, the sedimentation plate 4 is an inclined plate in the same direction as the flow direction, and the sediment settled on the sedimentation plate 4 slowly slides down to the sediment collection tank 7 at the bottom, and is discharged or extracted through the sediment discharge pipe at the bottom; the light phase entering the next unit flows in the gradually expanding flow channel formed by two sedimentation plates 4 with opposite inclinations, and the speed gradually decreases, which is conducive to the separation of light and heavy phases; after the light phase flows to the end of the flow channel, it flows into the next-level unit through the overflow baffle at the end; after multiple sedimentation separations, the original mixture is separated more thoroughly.

[0034] Since the sedimentation separation units are arranged in the vertical direction rather than the horizontal direction, the sedimentation area is greatly increased while saving floor space. According to the shallow pool theory of sedimentation separation, the sedimentation separation efficiency is proportional to the sedimentation area and has nothing to do with the height. Therefore, the height of the sedimentation separation unit is relatively small. More sedimentation separation units can be set within the same device height. The fluid flows repeatedly between multiple sedimentation separation units, and the separation efficiency is doubled. Moreover, since the cross-sectional area of ​​the flow channel gradually expands, the flow rate slows down, which is conducive to sedimentation separation. The light phase and heavy phase to be separated flow in the unit in a strict same direction. The settled heavy phase material is discharged from the sediment discharge pipe 6 at the bottom of the inclined sedimentation plate, and the light phase flows from the overflow baffle 5 at the top of each unit to the next unit. The light phase and the heavy phase will not affect each other to cause disturbance and back mixing, so the separation efficiency is greatly improved.

[0035] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A vertical multi-pass co-current flow sedimentation separation device, characterized in that: The invention comprises a box body (1), wherein a plurality of sedimentation separation units are arranged in series in the height direction in the box body (1), and the flow directions of two sedimentation separation units adjacent to each other are opposite. The structure of each sedimentation separation unit is as follows: it comprises a sedimentation plate (4) arranged to be inclined downward in the horizontal direction, and the upstream side and both sides of the sedimentation plate (4) are in contact with the inner wall of the box body (1), and a sediment collection groove (7) is arranged on the downstream side of the sedimentation plate (4), and a vertical overflow baffle (5) is arranged on the downstream side edge of the sedimentation collection groove (7); the sedimentation plates (4) of the two sedimentation separation units adjacent to each other are inclined in opposite directions, The flow channel cross-sectional area of ​​each sedimentation separation unit is gradually increased along the flow direction; the top and bottom of the box body (1) are respectively provided with a liquid inlet pipe (2) and a liquid outlet pipe (3); the solid-containing liquid flows into the box body (1) from the liquid inlet pipe (2), and after being sedimented and separated in a plurality of sedimentation separation units in sequence along the height direction, clear liquid flows out from the liquid outlet pipe (3); the sediment collection tank (7) is connected to a sediment discharge pipe (6) fixed on the box body (1); the solids settled in each unit are collected in the sediment collection tank (7) and then discharged from the sediment discharge pipe (6); The width of the overflow baffle (5) and the width of the sedimentation plate (4) are the same as the width of the box body (1); the overflow baffle (5) and the sedimentation plate (4) are closely connected to the inner wall of the box body (1), respectively; the overflow baffles (5) of two adjacent sedimentation separation units are arranged in parallel and are respectively distributed on both sides of the box body (1); the bottom plate of the sedimentation unit at the bottom is the bottom plate of the box body (1), and a corresponding sediment collection tank (7) is also arranged on its downstream side, and its outlet end is also connected to a corresponding sediment discharge pipe (6); the liquid outflow pipe (3) is arranged on the side wall of the box body (1) located at the bottom sedimentation separation unit; It also comprises a water distribution pipe (8), the water distribution pipe (8) being located on one side of the top of the box body (1), one side wall of the water distribution pipe (8) being connected to the liquid inlet pipe (2), and the other side wall being evenly distributed along the axial direction with a plurality of water distribution ports (81), through which the flocculant-containing liquid is input into the sedimentation separation unit at the top.

2. The vertical multi-pass co-current flow sedimentation separation device according to claim 1, characterized in that: The box body (1) is a rectangular parallelepiped.

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