Device for treating semi-coke wastewater through steam stripping separation

Abstract

The utility model relates to a device for stripping, separating and treating semi-coke wastewater, which comprises a cylindrical vertical stripping tower, the stripping tower comprises a gas phase outlet, a tower plate area and a kettle liquid outlet from top to bottom, the upper part of the tower plate area is provided with a feeding hole for inputting semi-coke wastewater containing an extracting agent, the bottom of the stripping tower is provided with a reboiler, and the kettle liquid outlet is communicated with the reboiler. The kettle liquid outlet is used for discharging the separated wastewater; the tower plate area comprises a plurality of horizontally arranged tower plate units, each tower plate unit comprises a tower plate and a gas-liquid exchange area, a plurality of vent holes are uniformly formed in the tower plate, the gas-liquid exchange area is cylindrical, the bottom of the side wall of the gas-liquid exchange area is fixed to the edge of the tower plate, the top of the gas-liquid exchange area is open, and steam of the tower plate units is allowed to be discharged upwards; the gas-liquid exchange area comprises a filler area, a separation mesh and a liquid area from top to bottom, and the filler area is filled with filler.

Description

Technical Field

[0001] The utility model belongs to the technical field of blue coke wastewater treatment, and in particular relates to a device for treating blue coke wastewater by steam stripping and separation. Background Art

[0002] Semi-coke wastewater is a type of industrial wastewater containing a large amount of organic pollutants. It is difficult to degrade and highly toxic. For example, it contains organic pollutants such as benzene, phenols, polycyclic aromatic hydrocarbons, nitrogen-oxygen heterocyclic compounds, etc. Semi-coke wastewater is generally first treated with oil removal, acid removal, deamination and dephenolization to obtain wastewater with high biodegradability, and then subjected to biochemical treatment. In particular, dephenolization treatment can remove and recover phenolic substances in semi-coke wastewater and recover valuable resources. The current dephenolization treatment is mainly an extraction method. The wastewater after extraction also contains an extractant and a small amount of organic pollutants. It is generally necessary to undergo steam stripping separation before biochemical treatment. However, the gas-liquid contact mass transfer effect of the current steam stripping equipment is poor, resulting in low separation efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in the dephenolization treatment of semi-coke wastewater, the problem of efficiently separating the extractant and a small amount of organic matter in the wastewater after dephenolization.

[0004] The utility model provides a device for stripping and separating semi-coke wastewater, comprising a cylindrical vertical stripping tower, the stripping tower comprising a gas phase outlet, a tray area and a kettle liquid outlet from top to bottom, a feed port is arranged at the top of the tray area, for inputting semi-coke wastewater containing an extractant, a reboiler is arranged at the bottom of the stripping tower, and the kettle liquid outlet is used for discharging the wastewater after separation treatment;

[0005] The tower plate area includes a number of horizontally arranged tower plate units, and the tower plate units include tower plates and gas-liquid exchange areas. A number of ventilation holes are evenly arranged on the tower plates. The gas-liquid exchange area is cylindrical, and the bottom of the side wall of the gas-liquid exchange area is fixed to the edge of the tower plate. The top of the gas-liquid exchange area is open to allow the steam of the tower plate unit to be discharged upward; the gas-liquid exchange area includes a packing area, a partition mesh and a liquid area from top to bottom, and the packing area is filled with packing.

[0006] Optionally, one side of the tower plate unit is fixedly connected to the inner wall of the stripping tower, and there is a gap between the other side of the tower plate unit and the other side of the inner wall of the stripping tower. Two upper and lower adjacent tower plate units are connected to one side of the inner wall of the stripping tower and are arranged opposite to each other, so that the wastewater flows downward in a zigzag manner in the tower plate area.

[0007] Optionally, the side wall of the gas-liquid exchange area is a solid wall, and the separation mesh is evenly and densely distributed with mesh holes;

[0008] An opening is arranged at the top of the side wall of the gas-liquid exchange zone facing the gap between the tower plate unit and the inner wall of the stripping tower, and a mesh is arranged at the opening to prevent the filler in the filler zone from leaking from the opening.

[0009] Optionally, a liftable cover is provided above the vent hole to control the opening and closing of the vent hole; a vertical filling column corresponds to the top of each vent hole, the filling column is filled with fillers, and the side wall of the filling column is a mesh.

[0010] Further optionally, the cover plate is in the shape of a cone that is smaller at the top and larger at the bottom, and can cover the cross-section of the vent hole.

[0011] Further optionally, the vent hole is provided with a circle of upwardly protruding hole side walls at the edge position on the upper surface of the tower plate, and a number of positioning circles are evenly arranged along the circumference of the hole side walls. A downwardly protruding positioning rod is provided at the position of the positioning circle on the lower surface of the cover plate. The positioning rod is always inserted in the corresponding positioning circle and can move up and down along the positioning circle to ensure that the cover plate is not misaligned when moving up and down.

[0012] Further optionally, the mesh on the side wall of the packing column is evenly and densely covered with mesh holes, allowing gas and liquid to flow freely, the bottom of the side wall of the packing column is fixed to the upper surface of the tower plate, the corresponding air holes and the cover plate are located inside the packing column, and a gap is left between the outer edge of the cover plate and the side wall of the packing column to prevent the mesh holes from affecting the lifting and lowering of the cover plate.

[0013] Optionally, the opening is evenly divided into two parts along the circumference of the gas-liquid exchange zone, and each sub-opening is provided with a corresponding gate. The gate is liftable and its shape is adapted to the shape of the side wall of the gas-liquid exchange zone. After the gate is raised, the corresponding part of the sub-opening is closed, so that each sub-opening can be opened and closed individually.

[0014] Optionally, the gas phase outlet is connected to the condenser and the separator in sequence through a pipeline. The separator is provided with an inlet at the top, a first outlet at the side, and a second outlet at the bottom. The second outlet is connected to the reflux port of the stripping tower, and the reflux port is provided above the tower plate area.

[0015] The device for treating blue carbon wastewater by steam stripping separation described in the utility model has the following beneficial effects:

[0016] (1) The tray unit of the stripping tower is a combination of trays and fillers. There is a gas-liquid exchange area above the tray. The wastewater overflowing from the upper tray unit fills the gas-liquid exchange area of ​​the lower tray unit. The steam overflowing from the vents evenly enters the liquid area and contacts with the wastewater for mass transfer. The steam then rises through the partition mesh and enters the filler area. On the surface of the filler, the gas and liquid fully contact and transfer mass again, so that the extractant and organic matter in the wastewater fully enter the steam, thereby improving the mass transfer efficiency.

[0017] (2) After the steam overflowing from the vent enters the liquid area, it is suppressed in the liquid area due to the obstruction of the packing area, so that the steam and the wastewater in the liquid area can fully transfer mass, thereby improving the mass transfer efficiency. At the same time, when the steam in the liquid area moves upward, it also collides with the vibrating separation mesh, and the steam also directly acts on the packing, so that the packing in the packing area is always in a vibrating or moving state. The packing rubs against each other for self-cleaning, and also cleans the separation mesh. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The schematic diagram of the structure of the device for stripping and separating blue carbon wastewater;

[0019] Figure 2 is a schematic diagram of a tower plate unit;

[0020] Figure 3 It is a schematic diagram of the matching of the packing column and the vent hole;

[0021] Figure 4 Schematic diagram of the opening on the side wall of the gas-liquid exchange area.

[0022] In the accompanying drawings, 1-stripping tower, 2-gas phase outlet, 3-plate area, 4-kettle liquid outlet, 5-feed port, 6-reboiler, 7-plate unit, 8-plate, 9-gas-liquid exchange area, 10-vent, 11-packing area, 12-partition mesh, 13-liquid area, 14-opening, 15-cover plate, 16-packing column, 17-hole side wall, 18-positioning ring, 19-positioning rod, 20-dividing opening. DETAILED DESCRIPTION

[0023] This embodiment provides a device for treating blue carbon wastewater by steam stripping separation, such as Figure 1-Figure 4 As shown, the stripping tower 1 includes a cylindrical vertical stripping tower 1, which includes a gas phase outlet 2, a tray area 3 and a kettle liquid outlet 4 from top to bottom. The upper part of the tray area 3 is provided with a feed inlet 5 for inputting semi-coke wastewater containing an extractant. The bottom of the stripping tower 1 is provided with a reboiler 6, and the kettle liquid outlet 4 is used to discharge the wastewater after separation treatment.

[0024] The plate area 3 includes a plurality of horizontally arranged plate units 7, the plate units 7 include plates 8 and a gas-liquid exchange area 9, a plurality of vents 10 are evenly arranged on the plates 8, the gas-liquid exchange area 9 is cylindrical, the bottom of the side wall of the gas-liquid exchange area 9 is fixed to the edge of the plates 8, and the top of the gas-liquid exchange area 9 is open, allowing the steam of the plate units 7 to be discharged upward; the gas-liquid exchange area 9 includes a packing area 11, a partition mesh 12 and a liquid area 13 from top to bottom, and the packing area 11 is filled with packing.

[0025] Optionally, one side of the tower plate unit 7 is fixedly connected to the inner wall of the stripping tower 1, and there is a gap between the other side of the tower plate unit 7 and the other side of the inner wall of the stripping tower 1. Two upper and lower adjacent tower plate units 7 are connected to one side of the inner wall of the stripping tower 1 and are arranged relative to each other, so that the wastewater flows downward in a zigzag manner in the tower plate area 3.

[0026] Optionally, the side wall of the gas-liquid exchange area 9 is a solid wall, and the separation mesh 12 is evenly and densely distributed with mesh holes, which can prevent the filler in the filler area 11 from falling and allow the liquid and steam in the filler area 11 and the liquid area 13 to be transferred between the two areas;

[0027] An opening 14 is provided at the top of the side wall of the gas-liquid exchange zone 9 facing the gap between the tower plate unit 7 and the inner wall of the stripping tower 1, allowing the liquid in the packing zone 11 to overflow to the tower plate unit 7 below; a mesh is provided at the opening 14 to prevent the packing in the packing zone 11 from being lost through the opening 14.

[0028] Optionally, a liftable cover plate 15 is provided above the vent 10 to control the opening and closing of the vent 10 and whether the steam below the tower plate 8 can pass through the vent 10; a vertical packing column 16 corresponds to the top of each vent 10, and the packing column 16 is filled with packing, and the side wall of the packing column 16 is a mesh. When the steam pressure below the vent 10 is greater than the weight of the packing in the packing column 16, the weight of the cover plate 15 and the liquid pressure in the gas-liquid exchange zone 9, the steam lifts the cover plate 15 and the packing, enters the liquid zone 13 from all sides of the cover plate 15, fully contacts and transfers mass with the wastewater, and allows the extractant and a small amount of organic pollutants in the wastewater to enter the steam.

[0029] Further optionally, the cover plate 15 is a conical shape with a small top and a large bottom, and can cover the cross section of the vent 10. When the steam pressure decreases, the filler in the filler area 11 presses the cover plate 15 downward, and the cover plate 15 covers the vent 10 downward to prevent the wastewater in the liquid area 13 from flowing down through the vent 10.

[0030] Further optionally, the vent hole 10 is provided with a circle of upwardly protruding hole side walls 17 at the edge position of the upper surface of the tower plate 8, and a plurality of positioning circles 18 are evenly arranged along the circumference of the hole side walls 17. A downwardly protruding positioning rod 19 is provided at the position of the positioning circle 18 on the lower surface of the cover plate 15. The positioning rod 19 is always inserted in the corresponding positioning circle 18 and can move up and down along the positioning circle 18 to ensure that the cover plate 15 is not misaligned when moving up and down.

[0031] Further optionally, the mesh on the side wall of the packing column 16 is evenly and densely covered with mesh holes, allowing gas and liquid to flow freely, the bottom of the side wall of the packing column 16 is fixed to the upper surface of the tower plate 8, the corresponding vent holes 10 and the cover plate 15 are located inside the packing column 16, and a gap is left between the outer edge of the cover plate 15 and the side wall of the packing column 16 to prevent the mesh holes from affecting the lifting and lowering of the cover plate 15.

[0032] Further optionally, the height of the packing column 16 is the same as the height of the gas-liquid exchange zone 9, that is, the top of the packing column 16 is flush with the top of the packing zone 11; the packing of the packing column 16 is the same as the packing of the packing zone 11, but the packing column 16 and the packing zone 11 are separated by the side wall of the packing column 16, and the packings of the two are not connected to each other. The packings can be conventional packings in the art.

[0033] The vent 10 of the traditional plate 8 is in the form of a valve, which allows only steam to pass through and does not allow the liquid on the plate 8 to pass through. This form is relatively cumbersome. For the extracted semi-coke wastewater of the present invention, which contains extractants and pollutants, it is easy to block the valve. The utility model adopts a packing column 16 in combination with a cover plate 15, and uses the gravity of the packing in the packing column 16 to press the cover plate 15 downward to cover the vent 10. When the steam pressure under the plate 8 increases, the cover plate 15 can be lifted upward, and the steam is evenly distributed through the cover plate 15, and evenly overflows from the four edges of the cover plate 15 to the liquid area 13, and evenly contacts the wastewater in the liquid area 13. When the steam pressure decreases, the packing in the packing column 16 presses the cover plate 15 back and covers the vent 10, preventing the wastewater in the liquid area 13 from flowing out of the vent 10.

[0034] Optionally, the opening is evenly divided into two parts along the circumference of the gas-liquid exchange zone 9, and each sub-opening 20 is provided with a corresponding gate. The gate is liftable, and its shape is adapted to the shape of the side wall of the gas-liquid exchange zone 9. After the gate is raised, the corresponding part of the sub-opening 20 is closed, so that each sub-opening 20 can be opened and closed individually.

[0035] When the stripping tower 1 is operated for a long time or the steam power is insufficient, different sub-openings 20 are controlled to overflow separately. For example, the sub-opening on the left is opened and the sub-opening on the right is closed at the same time. The fillers in the filler area 11 are driven by the liquid to roll tilted to the left. The sub-opening on the right is opened and the sub-opening on the left is closed at the same time. The fillers in the filler area 11 are driven by the liquid to roll tilted to the right. In this way, during the back and forth rolling process, the fillers rub against each other and the separation mesh 12, clean each other, improve the packing stacking condition, and promote the uniform dispersion of the fillers.

[0036] Optionally, the gas phase outlet 2 is connected to the condenser and the separator in sequence through a pipeline. The separator is provided with an inlet at the top, a first outlet at the side, and a second outlet at the bottom. The second outlet is connected to the reflux port of the stripping tower 1, and the reflux port is provided above the tower plate area 3.

[0037] The steam from the stripping tower 1 carries the extractant and a small amount of organic matter and is discharged from the gas phase outlet 2. After being condensed by the condenser, it is discharged into the separator and separated by utilizing the density difference of the liquids. The extractant and other liquids with lower density are discharged from the first outlet and can be collected and used for extraction. The wastewater aqueous phase is discharged from the second outlet and then returned to the stripping tower 1 through the reflux port as a liquid phase supplement and flows down as a liquid phase together with the wastewater from the feed port 5.

Claims

1. A device for stripping and separating blue carbon wastewater, characterized in that: The stripping tower comprises a cylindrical vertical stripping tower, which comprises a gas phase outlet, a tray area and a kettle liquid outlet from top to bottom. A feed port is provided at the top of the tray area for inputting semi-coke wastewater containing an extractant. A reboiler is provided at the bottom of the stripping tower, and the kettle liquid outlet is used to discharge the wastewater after separation treatment. The tower plate area includes a number of horizontally arranged tower plate units, and the tower plate unit includes a tower plate and a gas-liquid exchange area. A number of ventilation holes are evenly arranged on the tower plate. The gas-liquid exchange area is cylindrical, and the bottom of the side wall of the gas-liquid exchange area is fixed to the edge of the tower plate. The top of the gas-liquid exchange area is open to allow the steam of the tower plate unit to be discharged upward; the gas-liquid exchange area includes a packing area, a partition mesh and a liquid area from top to bottom, and the packing area is filled with packing.

2. The device for treating blue carbon wastewater by steam stripping separation according to claim 1, characterized in that: One side of the tower plate unit is fixedly connected to the inner wall of the stripping tower, and there is a gap between the other side of the tower plate unit and the other side of the inner wall of the stripping tower. Two upper and lower adjacent tower plate units are connected to one side of the inner wall of the stripping tower and are arranged opposite to each other, so that the wastewater flows downward in a zigzag manner in the tower plate area.

3. The device for treating blue carbon wastewater by steam stripping separation according to claim 2, characterized in that: The side wall of the gas-liquid exchange area is a solid wall, and the separation mesh is evenly and densely distributed with mesh holes; An opening is arranged at the top of the side wall of the gas-liquid exchange zone facing the gap between the tower plate unit and the inner wall of the stripping tower, and a mesh is arranged at the opening to prevent the filler in the filler zone from leaking from the opening.

4. The device for treating blue carbon wastewater by steam stripping separation according to claim 3, characterized in that: A liftable cover plate is provided above the vent hole to control the opening and closing of the vent hole; a vertical packing column corresponds to the top of each vent hole, the packing column is filled with packing, and the side wall of the packing column is a mesh.

5. The device for treating blue carbon wastewater by steam stripping separation according to claim 4, characterized in that: The cover plate is in a conical shape with a small top and a large bottom, and can cover the cross section of the vent hole.

6. The device for treating blue carbon wastewater by steam stripping separation according to claim 5, characterized in that: The vent hole is located at the edge of the upper surface of the tower plate and is provided with a circle of upwardly protruding hole side walls, and a number of positioning circles are evenly arranged along the circumference of the hole side walls. A downwardly protruding positioning rod is provided at the position of the positioning circle corresponding to the lower surface of the cover plate. The positioning rod is always inserted in the corresponding positioning circle and can move up and down along the positioning circle to ensure that the cover plate is not misaligned when moving up and down.

7. The device for treating blue carbon wastewater by steam stripping separation according to claim 6, characterized in that: The mesh on the side wall of the packing column is evenly and densely covered with mesh holes, allowing gas and liquid to flow freely. The bottom of the side wall of the packing column is fixed to the upper surface of the tower plate, and the corresponding ventilation holes and cover plate are located inside the packing column. A gap is left between the outer edge of the cover plate and the side wall of the packing column to prevent the mesh holes from affecting the lifting and lowering of the cover plate.

8. The device for treating blue carbon wastewater by steam stripping separation according to claim 3, characterized in that: The opening is evenly divided into two parts along the circumference of the gas-liquid exchange zone, and each sub-opening is provided with a corresponding gate, which is liftable and has a shape adapted to the shape of the side wall of the gas-liquid exchange zone. After the gate is raised, the corresponding part of the sub-opening is closed, so that each sub-opening can be opened and closed individually.

9. The device for treating blue carbon wastewater by steam stripping separation according to claim 1, characterized in that: The gas phase outlet is connected to the condenser and the separator in sequence through a pipeline. The top of the separator is provided with an inlet, the side is provided with a first outlet, and the bottom is provided with a second outlet. The second outlet is connected to the reflux port of the stripping tower, and the reflux port is provided above the tower plate area.

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