An extraction device for removing phenol from semi-coal wastewater

Abstract

The present invention relates to an extraction device for extracting and removing phenol from semi-coke wastewater, comprising an extraction tower, wherein a rotating packing layer and a movable packing layer are provided in the extraction tower, and the rotating packing layer is located below the movable packing layer; an extract outlet is provided at the top of the extraction tower, a wastewater inlet is provided at the upper part, and an extractant inlet and a kettle liquid outlet are provided at the bottom; a stirring shaft is provided at the center of the rotating packing layer, and is driven to rotate by a motor at the bottom of the extraction tower; the movable packing layer comprises a central pillar and a supporting guide rail spirally wrapped around the outer side of the central pillar, a plurality of packing cages are connected to each other to form a chain, and move from bottom to top along the supporting guide rail, a hollow interlayer is provided on the side wall of the extraction tower corresponding to the movable packing layer, a plurality of rotating wheels are provided in the interlayer, which are used to introduce the packing cage at the top of the movable packing layer into the interlayer, move it downward, and then pass through the bottom of the interlayer and move upward again along the supporting guide rail; a spray device is provided at the top of the interlayer, which is used to clean the packing cage moved into the interlayer.

Description

Technical Field

[0001] The invention belongs to the technical field of semi-coke wastewater treatment, and particularly relates to an extraction device for extracting and removing phenol from semi-coke wastewater. Background Art

[0002] Lignite is a carbonaceous material made by dry distilling clean coal at medium to low temperatures. It has high fixed carbon content, high specific resistivity, high chemical activity, low ash content, low aluminum content, low sulfur content, and low phosphorus content. It is widely used in the production of products such as calcium carbide, ferroalloys, ferrosilicon, and silicon carbide. The production of lignite requires cooling and washing processes, which generate lignite wastewater. Due to direct contact with the coal, lignite wastewater contains a complex composition, particularly high levels of coal tar and phenols, making it a resource-based wastewater and difficult to treat. Currently, the extraction of phenols from lignite wastewater is a major avenue for resource recycling. However, even if degreasing can remove most of the coal tar and other oily substances in lignite wastewater, residual oil can still contaminate the tower plates or packing, making the operation and maintenance of traditional extraction towers difficult and affecting the extraction of phenols. Summary of the Invention

[0003] In response to the above problems, the present invention provides an extraction device for extracting and removing phenols from semi-coke wastewater, comprising an extraction tower, wherein a rotating packing layer and a moving packing layer are provided in the extraction tower, and the rotating packing layer is located below the moving packing layer; the extraction tower is provided with an extract outlet at the top, a wastewater inlet at the upper part, and an extractant inlet and a kettle liquid outlet at the bottom, which are respectively used to discharge the extractant containing phenols, input semi-coke wastewater, input the extractant, and discharge the kettle bottom liquid;

[0004] A stirring shaft is provided at the center of the rotating packing layer, which is driven to rotate by the motor at the bottom of the extraction tower; the movable packing layer includes a central pillar and a support guide rail spirally wrapped around the outside of the central pillar. Several packing cages are connected to each other to form a chain and move from bottom to top along the support guide rail. A hollow interlayer is provided on the side wall of the extraction tower corresponding to the movable packing layer. Several rotating wheels are provided in the interlayer to introduce the packing cage at the top of the movable packing layer into the interlayer, move it downward, and then pass through the bottom of the interlayer and move up along the support guide rail again; a spray device is provided on the top of the interlayer to clean the packing cage moved into the interlayer.

[0005] In the extraction tower of the present invention, semi-coke wastewater and the extractant are countercurrently contacted and extracted. The extract containing phenolic substances is discharged from the extract outlet at the top of the tower for subsequent separation treatment; the wastewater is discharged from the kettle liquid outlet for subsequent professional treatment. The extraction tower is divided into upper and lower parts. The upper part preferentially contacts the semi-coke wastewater, which will cause a large amount of oil substances to adhere to the packing, affecting the packing performance. The present invention provides a movable packing layer that can be moved and cleaned in the upper part of the extraction tower. When the wastewater reaches the lower part of the extraction tower, the oil contamination is reduced. Therefore, a rotating packing layer that can rotate in place is used to avoid oil contamination while improving the packing efficiency.

[0006] Optionally, the rotating packing layer includes a stirring shaft and a packing portion, the packing portion is in a strip shape and spirally wound from top to bottom along the outer side of the stirring shaft, the bottom of the stirring shaft passes through the bottom of the extraction tower and is connected to a motor outside the bottom of the extraction tower to drive the stirring shaft and the packing portion to rotate;

[0007] The inner side of the filler part is fixed on the stirring shaft, and the outer layer extends toward the inner wall of the extraction tower with a gap between the outer layer and the inner wall of the extraction tower.

[0008] Further optionally, the filler part is in the form of a mesh cage with filler filled inside. A plurality of partition walls are provided in the filler part, and the plurality of partition walls are evenly distributed along the length direction of the filler part, dividing the filler part into a plurality of sections, each section being filled with filler.

[0009] Further optionally, the upper surface, the lower surface and the outer side surface of the filler portion are all in the form of corrugated strips and flat strips arranged at intervals, and the flat strips are at a height between the crests and troughs of the corrugated strips.

[0010] Optionally, the extractant inlet is arranged below the lowest layer of the rotating packing layer, and the kettle liquid outlet is arranged below the extractant inlet.

[0011] Optionally, the movable packing layer, the rotating packing layer and the extraction tower are arranged concentrically, that is, the central pillar, the stirring shaft and the axis of the extraction tower are on the same vertical line; the top of the central pillar is fixedly connected to the top surface of the extraction tower;

[0012] The support rail includes an inner support bar and an outer support bar spirally wound around the outer side of the central pillar, the inner support bar is close to the outer side of the central pillar, and a plurality of rolling cross bars are connected between the inner support bar and the outer support bar. The rolling cross bars are arranged horizontally and are used to support the stuffing cage;

[0013] A cleaning inlet is provided on the inner wall of the extraction tower at a position corresponding to the top port of the support guide rail, and a cleaning outlet is provided on the inner wall of the extraction tower at a position corresponding to the bottom port of the support guide rail. The cleaning inlet and the cleaning outlet are on the same vertical line, and the interlayer is connected to the support guide rail through the cleaning inlet and the cleaning outlet.

[0014] Further optionally, the outer supporting bar is provided on the inner wall of the extraction tower, and the two ends of the rolling cross bar are rotatably connected to the inner supporting bar and the outer supporting bar respectively.

[0015] Further optionally, a first rotating wheel is provided at a position corresponding to the cleaning inlet in the interlayer, and the first rotating wheel is at the same height as the cleaning inlet; a second rotating wheel is provided at a position corresponding to the cleaning outlet in the interlayer, and the second rotating wheel is at the same height as the cleaning outlet;

[0016] A plurality of third rotating wheels are provided between the first rotating wheel and the second rotating wheel. The rotating shafts of all the rotating wheels pass through the side wall of the interlayer and are respectively connected to corresponding rotating motors outside the extraction tower;

[0017] A plurality of convex teeth are evenly arranged on the outer side surfaces of all the rotating wheels along the circumference of the rotating wheels. The convex teeth are used to be inserted into the stuffing cage and drive the stuffing cage to move.

[0018] Further optionally, the spraying device inside the interlayer is provided above the first rotating wheel, and is used for spraying the extractant onto the stuffing cage moved into the interlayer to clean the stuffing cage.

[0019] Optionally, the wastewater inlet is located above the moving packing layer.

[0020] Optionally, a tower plate is further provided on the outer side of the central pillar, the tower plate is located below the support rail and spirally surrounds the central pillar;

[0021] The upper surface of the tray is smooth and evenly distributed with large and small through-holes. The aperture of the large through-holes is larger than that of the small through-holes. The large through-holes are used to allow the wastewater on the tray to flow down to the next layer of packing cages, and the small through-holes are used to allow the rising airflow to pass through.

[0022] An overflow weir is provided on the outer side of the tower tray, and there is a gap between the tray and the inner wall of the extraction tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the structure of an extraction device for removing phenol from semi-coal wastewater (the tray is omitted);

[0024] Figure 2 It is a partial schematic diagram of the support rail;

[0025] Figure 3 This is a partial schematic diagram of the tower plate.

[0026] In the accompanying drawings, 1-extraction tower, 2-rotating packing layer, 3-moving packing layer, 4-extract outlet, 5-wastewater inlet, 6-extractant inlet, 7-kettle liquid outlet, 8-stirring shaft, 9-center pillar, 10-support guide rail, 11-packing cage, 12-interlayer, 13-rotating wheel, 14-packing part, 15-exhaust gas outlet, 16-overflow weir, 17-inner support bar, 18-outer support bar, 19-rolling cross bar, 20-cleaning inlet, 21-cleaning outlet, 22-tower plate, 23-large through hole, 24-small through hole. DETAILED DESCRIPTION

[0027] This embodiment provides an extraction device for removing phenol from semi-coal wastewater, such as Figure 1-Figure 3 As shown, it includes an extraction tower 1, in which a rotating packing layer 2 and a moving packing layer 3 are provided, and the rotating packing layer 2 is located below the moving packing layer 3; the top of the extraction tower 1 is provided with an extract outlet 4, the upper part is provided with a wastewater inlet 5, and the bottom is provided with an extractant inlet 6 and a kettle liquid outlet 7, which are respectively used to discharge the extractant containing phenols, input blue carbon wastewater, input the extractant, and discharge the kettle bottom liquid;

[0028] A stirring shaft 8 is provided at the center of the rotating packing layer 2, which is driven to rotate by the motor at the bottom of the extraction tower 1; the movable packing layer 3 includes a central pillar 9 and a support guide rail 10 spirally wrapped around the outside of the central pillar 9, and several packing cages 11 are connected to each other to form a chain, and move from bottom to top along the support guide rail 10. A hollow interlayer 12 is provided on the side wall of the extraction tower 1 corresponding to the movable packing layer 3, and several rotating wheels 13 are provided in the interlayer 12, which are used to introduce the packing cage 11 at the top of the movable packing layer 3 into the interlayer 12, move it downward, and then pass through the bottom of the interlayer 12 and move up along the support guide rail 10 again; a spray device is provided on the top of the interlayer 12 to clean the packing cage 11 moved into the interlayer 12.

[0029] Optionally, the rotating packing layer 2 includes a stirring shaft 8 and a packing portion 14, the packing portion 14 is in a strip shape and spirally wound from top to bottom along the outer side of the stirring shaft 8, the bottom of the stirring shaft 8 passes through the bottom of the extraction tower 1, and is connected to the motor outside the bottom of the extraction tower 1, for driving the stirring shaft 8 and the packing portion 14 to rotate;

[0030] The inner side of the packing part 14 is fixed on the stirring shaft 8 , and the outer layer extends toward the inner wall of the extraction tower 1 with a gap between the packing part 14 and the inner wall of the extraction tower 1 .

[0031] Further optionally, the filler portion 14 is in the form of a mesh cage with filler filled inside. A plurality of partition walls are provided in the filler portion 14 and the partition walls are evenly distributed along the length direction of the filler portion 14 to divide the filler portion 14 into a plurality of sections, each of which is filled with filler.

[0032] Alternatively, the upper, lower, and outer surfaces of the packing section 14 may be arranged in a pattern of alternating corrugated and flat strips, with the flat strips positioned between the peaks and valleys of the corrugated strips. The inventors unexpectedly discovered that this unique surface configuration not only stabilizes the filler particles within each packing section 14 but also increases the contact area between the packing section 14 and the material flowing within the extraction column 1, thereby improving the extraction effect.

[0033] Optionally, the extractant inlet 6 is provided below the lowest packing layer of the rotating packing layer 2 , and the kettle liquid outlet 7 is provided below the extractant inlet 6 .

[0034] Optionally, the movable packing layer 3, the rotating packing layer 2 and the extraction tower 1 are arranged concentrically, that is, the central pillar 9, the stirring shaft 8 and the axis of the extraction tower 1 are on the same vertical line; the top of the central pillar 9 is fixedly connected to the top surface of the extraction tower 1;

[0035] The support rail 10 includes an inner support bar 17 and an outer support bar 18 spirally wound around the outer side of the central pillar 9. The inner support bar 17 is close to the outer side of the central pillar 9. A plurality of rolling cross bars 19 are connected between the inner support bar 17 and the outer support bar 18. The rolling cross bars 19 are arranged horizontally to support the stuffing cage 11.

[0036] A cleaning inlet 20 is provided on the inner wall of the extraction tower 1 at a position corresponding to the top port of the support guide rail 10, and a cleaning outlet 21 is provided on the inner wall of the extraction tower 1 at a position corresponding to the bottom port of the support guide rail 10. The cleaning inlet 20 and the cleaning outlet 21 are on the same vertical line, and the interlayer 12 is connected to the support guide rail 10 through the cleaning inlet 20 and the cleaning outlet 21.

[0037] Further optionally, the outer support bar 18 is arranged on the inner wall of the extraction tower 1, and the two ends of the rolling cross bar 19 are respectively rotatably connected to the inner support bar 17 and the outer support bar 18. When the stuffing cage 11 moves on the support guide rail 10, it can drive the rolling cross bar 19 to rotate, thereby reducing friction resistance, and the rotation of the rolling cross bar 19 does not require electric drive, thereby saving energy consumption.

[0038] Further optionally, a first rotating wheel 13 is provided in the interlayer 12 at a position corresponding to the cleaning inlet 20, and the first rotating wheel 13 is at the same height as the cleaning inlet 20; a second rotating wheel 13 is provided in the interlayer 12 at a position corresponding to the cleaning outlet 21, and the second rotating wheel 13 is at the same height as the cleaning outlet 21;

[0039] A plurality of third rotating wheels 13 are provided between the first rotating wheel 13 and the second rotating wheel 13. The rotating shafts of all the rotating wheels 13 pass through the side wall of the interlayer 12 and are respectively connected to corresponding rotating motors outside the extraction tower 1.

[0040] A plurality of protruding teeth are evenly arranged on the outer side surfaces of all the rotating wheels 13 along the circumference of the rotating wheels 13 . The protruding teeth are used to be inserted into the stuffing cage 11 and drive the stuffing cage 11 to move.

[0041] Further optionally, the spraying device inside the interlayer 12 is provided above the first rotating wheel 13 , and is used for spraying the extractant onto the stuffing cage 11 moved into the interlayer 12 , so as to clean the stuffing cage 11 .

[0042] Optionally, the wastewater inlet 5 is located above the moving packing layer 3 .

[0043] Each surface of the stuffing cage 11 of the present invention is flat, and the connection between adjacent stuffing cages 11 is a flexible connection, so that when the rotating wheel 13 pulls the stuffing cage 11 to move, the chain-like stuffing cage 11 combination can spiral and rise along the spiral support rail 10. The width of the stuffing cage 11 only needs to be slightly smaller than the length of the rolling cross bar 19. The semi-coke wastewater enters from the wastewater inlet 5 and preferentially falls on the stuffing cage 11 of the movable stuffing layer 3. Therefore, the stuffing cage 11 takes on more oil substances in the wastewater and is more susceptible to contamination, which affects the extraction effect. The stuffing cage 11 of the present invention can rise continuously along the support rail 10, and the rotating wheel 13 in the interlayer 12 is introduced into the interlayer 12 and cleaned. The cleaned stuffing cage 11 is removed from the cleaning outlet 21, and the top port and the bottom port of the support rail 10 are in the same vertical line. The stuffing cage 11 returns to the bottom port of the support rail 10 again, and the cycle repeats. The cleaned extractant in the interlayer 12 flows out from the cleaning outlet 21 and flows down along the inner wall of the extraction tower 1, and basically does not contaminate the rotating packing layer 2 below. Alternatively, an outlet is provided on the outer wall of the interlayer 12 to lead the cleaned extractant out of the extraction tower 1.

[0044] Optionally, a tower tray 22 is further provided on the outer side of the central pillar 9. The tower tray 22 is located below the support rail 10 and spirally surrounds the central pillar 9, that is, a tower tray 22 is provided between the upper and lower adjacent support rails 10.

[0045] The upper surface of the tray 22 is smooth and evenly distributed with large through holes 23 and small through holes 24. The aperture of the large through holes 23 is larger than that of the small through holes 24. The large through holes 23 are used to allow wastewater on the tray 22 to flow down to the next layer of packing cages 11, and the small through holes 24 are used to allow rising airflow to pass through.

[0046] An overflow weir 16 is provided on the outer side of the column tray 22 , and there is a gap between the column tray 22 and the inner wall of the extraction column 1 .

[0047] The present invention utilizes a packing cage 11 and tray 22 at the top of the extraction tower 1 to enhance extraction efficiency. The vast majority of wastewater flowing from the packing cage 11 flows onto the tray 22 below, while a portion flows through the large through-holes 23 to the next layer of packing cages 11. Small through-holes 24, with their high air velocity, allow the rising airflow to pass through and contact the wastewater on the tray 22, promoting extraction. Because the tray 22 has a smooth, spiraling surface, the wastewater forms a liquid film along its upper surface, effectively improving extraction efficiency on the tray 22.

[0048] Optionally, a tail gas outlet 15 is provided at the top of the extraction tower 1 . The tail gas outlet 15 is located above the extract outlet 4 and is used to discharge waste gas inside the extraction tower 1 .

Claims

1. An extraction device for removing phenol from semi-coke wastewater, characterized in that: The extraction tower comprises an extraction tower, wherein a rotating packing layer and a moving packing layer are provided in the extraction tower, and the rotating packing layer is located below the moving packing layer; the extraction tower is provided with an extract outlet at the top, a wastewater inlet at the upper part, and an extractant inlet and a kettle liquid outlet at the bottom, which are respectively used to discharge the extractant containing phenols, input the semi-coke wastewater, input the extractant, and discharge the kettle bottom liquid; A stirring shaft is provided at the center of the rotating packing layer, which is driven to rotate by the motor at the bottom of the extraction tower; the movable packing layer includes a central pillar and a support guide rail spirally wrapped around the outside of the central pillar. Several packing cages are connected to each other to form a chain and move from bottom to top along the support guide rail. A hollow interlayer is provided on the side wall of the extraction tower corresponding to the movable packing layer. Several rotating wheels are provided in the interlayer to introduce the packing cage at the top of the movable packing layer into the interlayer, move it downward, and then pass through the bottom of the interlayer and move up along the support guide rail again; a spray device is provided on the top of the interlayer to clean the packing cage moved into the interlayer.

2. The extraction device for removing phenol from blue carbon wastewater according to claim 1, characterized in that: The rotating packing layer includes a stirring shaft and a packing portion, the packing portion is in a strip shape and spirally wound from top to bottom along the outer side of the stirring shaft, the bottom of the stirring shaft passes through the bottom of the extraction tower and is connected to the motor outside the bottom of the extraction tower to drive the stirring shaft and the packing portion to rotate; The inner side of the filler part is fixed on the stirring shaft, and the outer layer extends toward the inner wall of the extraction tower with a gap between the outer layer and the inner wall of the extraction tower.

3. The extraction device for removing phenol from blue carbon wastewater according to claim 2, characterized in that: The packing part is in the form of a mesh cage, and a plurality of partition walls are arranged in the packing part. The plurality of partition walls are evenly distributed along the length direction of the packing part, dividing the packing part into a plurality of sections, and each section is filled with packing respectively.

4. The extraction device for removing phenol from blue carbon wastewater according to claim 3, characterized in that: The upper surface, the lower surface and the outer side surface of the filler part are all in the form of corrugated strips and flat strips arranged at intervals, and the flat strips are at a height between the crests and troughs of the corrugated strips.

5. The extraction device for removing phenol from blue carbon wastewater according to claim 1, characterized in that: The movable packing layer and the rotating packing layer are arranged concentrically with the extraction tower, and the central pillar, the stirring shaft and the axis of the extraction tower are on the same vertical line; the top of the central pillar is fixedly connected to the top surface of the extraction tower; The support rail includes an inner support bar and an outer support bar spirally wound around the outer side of the central pillar, the inner support bar is close to the outer side of the central pillar, and a plurality of rolling cross bars are connected between the inner support bar and the outer support bar. The rolling cross bars are arranged horizontally and are used to support the stuffing cage; A cleaning inlet is provided on the inner wall of the extraction tower at a position corresponding to the top port of the support guide rail, and a cleaning outlet is provided on the inner wall of the extraction tower at a position corresponding to the bottom port of the support guide rail. The cleaning inlet and the cleaning outlet are on the same vertical line, and the interlayer is connected to the support guide rail through the cleaning inlet and the cleaning outlet.

6. The extraction device for removing phenol from semi-coal wastewater according to claim 5, characterized in that: The outer supporting bar is arranged on the inner wall of the extraction tower, and the two ends of the rolling cross bar are respectively rotatably connected to the inner supporting bar and the outer supporting bar.

7. The extraction device for removing phenol from semi-coal wastewater according to claim 5, characterized in that: A first rotating wheel is provided at a position corresponding to the cleaning inlet in the interlayer, and the first rotating wheel is at the same height as the cleaning inlet; a second rotating wheel is provided at a position corresponding to the cleaning outlet in the interlayer, and the second rotating wheel is at the same height as the cleaning outlet; A plurality of third rotating wheels are provided between the first rotating wheel and the second rotating wheel. The rotating shafts of all the rotating wheels pass through the side wall of the interlayer and are respectively connected to corresponding rotating motors outside the extraction tower; A plurality of convex teeth are evenly arranged on the outer side surfaces of all the rotating wheels along the circumference of the rotating wheels. The convex teeth are used to be inserted into the stuffing cage and drive the stuffing cage to move.

8. The extraction device for removing phenol from semi-coal wastewater according to claim 7, characterized in that: The spraying device inside the interlayer is arranged above the first rotating wheel and is used for spraying the extractant onto the packing cage moved into the interlayer to clean the packing cage.

9. The extraction device for removing phenol from semi-coal wastewater according to claim 1, characterized in that: The outer side of the central pillar is also provided with a tower plate, which is located below the support rail and spirally surrounds the central pillar; The upper surface of the tray is smooth and evenly distributed with large and small through-holes. The aperture of the large through-holes is larger than that of the small through-holes. The large through-holes are used to allow the wastewater on the tray to flow down to the next layer of packing cages, and the small through-holes are used to allow the rising airflow to pass through. An overflow weir is provided on the outer side of the tower tray, and there is a gap between the tray and the inner wall of the extraction tower.

10. The extraction device for removing phenol from semi-coke wastewater according to claim 1, characterized in that: The wastewater inlet is located above the moving packing layer; the extractant inlet is located below the lowest packing layer of the rotating packing layer, and the kettle liquid outlet is located below the extractant inlet.

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