A water washing system containing acetonitrile wastewater and water washing process thereof

Abstract

The invention discloses a washing system for acetonitrile wastewater and a washing process thereof in the technical field of washing acetonitrile wastewater. The system comprises a washing tower and a demisting layer. The demisting layer comprises an upper screen plate and a lower screen plate. The upper screen plate is fixedly connected to the inner wall of the washing tower. A plurality of support rings are fixedly installed on the inner side of the washing tower. The lower screen plates are all located on the inner side of the support ring and are rotatably connected thereto. A detection mechanism is arranged at the bottom of the rear end of the support ring. The detection mechanism is used for regularly detecting the blockage of the demisting layer. Brush rollers are arranged at the bottom ends of the upper screen plate and the lower screen plate through a cleaning mechanism. The cleaning mechanism is used for driving the brush rollers to clean the surfaces of the upper screen plate and the lower screen plate when the detection mechanism detects that the demisting layer is blocked. A plurality of brush rods are arranged at the bottom end of the upper screen plate through a stirring mechanism. The problem that the existing washing tower for washing acetonitrile wastewater does not have the function of automatically clearing the demisting layer during the washing process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of acetonitrile-containing wastewater washing, in particular to an acetonitrile-containing wastewater washing system and a washing process thereof. Background Art

[0002] Wastewater recovery method containing acetonitrile and C4 hydrocarbons:

[0003] (1) sending the aqueous phase feed stream containing acetonitrile and C4 hydrocarbons to the feed tank of the acetonitrile recovery tower for gas-liquid separation;

[0004] (2) the obtained liquid phase at the bottom of the feed tank of the acetonitrile recovery tower is pressurized and heated, and then enters the middle of the acetonitrile recovery tower;

[0005] (3) In the acetonitrile recovery tower, a recovery tower top liquid phase rich in acetonitrile and a recovery tower top gas phase rich in C4 hydrocarbons are extracted from the tower top, wherein the acetonitrile recovery tower top liquid phase is output as an acetonitrile recovery product, and the acetonitrile recovery tower top gas phase and the acetonitrile recovery tower feed tank tank top gas phase enter the bottom of the tail gas washing tower together, and after washing and recovering acetonitrile, the C4 hydrocarbon-rich water washing tower top gas phase is recovered;

[0006] (4) After cooling, part of the liquid phase in the bottom of the acetonitrile recovery tower is sent to the top of the tail gas water washing tower for recycling as washing water.

[0007] In the existing technology, the acetonitrile-containing tail gas remaining after wastewater treatment is transported to a water washing tower. When the water washing tower sprays the acetonitrile-containing tail gas, the demisting layer in the spray tower will gradually accumulate impurities, dust and other attachments, which can easily cause the demisting layer to be blocked, affecting the use of the water washing tower. In the existing technology, the staff can only clean the demisting layer after a batch of products are processed, and it is impossible to keep the demisting layer unobstructed during the processing. Secondly, when the water washing tower is working, the staff cannot detect the degree of blockage of the demisting layer, which brings inconvenience to the water washing operation of the water washing tower.

[0008] Based on this, the present invention designs a water washing system and a water washing process for acetonitrile wastewater to solve the above problems. Summary of the invention

[0009] The object of the present invention is to provide a water washing system and a water washing process for acetonitrile wastewater having the function of automatically clearing the demisting layer during the water washing process in a water washing tower, so as to solve the problems raised in the above-mentioned background technology.

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a water washing system containing acetonitrile wastewater, comprising a water washing tower and a demisting layer, wherein the demisting layer comprises an upper screen and a lower screen, wherein the upper screen is fixedly connected to the inner wall of the water washing tower, wherein a plurality of support rings are fixedly installed on the inner side of the water washing tower, wherein the lower screens are all located on the inner side of the support rings and are rotatably connected thereto, wherein a detection mechanism is arranged at the bottom of the rear end of the support rings, wherein the detection mechanism is used to regularly detect the blockage of the demisting layer, wherein the bottom ends of the upper screen and the lower screen are both provided with brush rollers through a cleaning mechanism, wherein the cleaning mechanism is used to drive the brush rollers to clean the surfaces of the upper screen and the lower screen when the detection mechanism detects that the demisting layer is blocked, wherein the bottom end of the upper screen is provided with a plurality of brush rods through a stirring mechanism, wherein the stirring mechanism is used to drive the brush rods to stir and brush the filler balls between the upper screen and the lower screen when the brush rollers clean the upper screen;

[0011] As a further scheme of the present invention, the cleaning mechanism includes a first support frame fixedly installed below the support ring, the right end of the first support frame is slidably connected to the first material receiving box through a locking mechanism, the first rotating shaft is fixedly installed on the top of the right end of the first material receiving box, the brush roller is located on the outside of the first rotating shaft and is rotatably connected thereto, the first combing plate is fixedly installed at the top opening of the first material receiving box, the first switch valve is installed on the right side of the water washing tower, the first switch valve corresponds to the first material receiving box, the inner side of the left end of the support ring is rotatably connected to a gear, the outer side of the lower mesh plate is fixedly installed with a gear ring, the gear ring is connected to the gear, the first motor is fixedly installed on the bottom of the left end of the support ring, the output end of the first motor is connected to the gear, and a mounting post is fixedly installed on the middle part of the top end of the lower mesh plate, and the top of the mounting post passes through the mesh plate and is rotatably connected thereto;

[0012] A second supporting frame is fixedly installed on the right side of the top of the mounting column, and a second material receiving box is slidably connected to the top of the second supporting frame, and a second rotating shaft is fixedly installed on the top of the right end of the second material receiving box, the brush roller is located on the outside of the second rotating shaft and is rotatably connected thereto, and a second combing plate is fixedly installed at the top opening of the second material receiving box, and a second switching valve is installed on the right end of the water washing tower, and the right end of the second material receiving box corresponds to the second switching valve, and an annular groove is spliced ​​between the side wall of the second switching valve and the inner wall of the water washing tower, and a spherical block is fixedly installed on the right end of the second material receiving box, and the right end of the spherical block passes through the annular groove and is slidably connected thereto;

[0013] As a further solution of the present invention, the locking mechanism includes a wedge-shaped rod slidably connected to the right end of the first support frame through a tension spring, and the left side of the top end of the wedge-shaped rod is tightly fitted with the right end of the first material receiving box;

[0014] As a further solution of the present invention, the bristles on the surface of the brush roller and the brush rod are hard, and the bristles on the surface of the brush roller can penetrate the holes on the surface of the upper and lower mesh plates;

[0015] As a further solution of the present invention, the stirring mechanism includes a limit box fixedly installed at the bottom end of the second material receiving box, a slide rod is slidably connected to the inner side of the bottom end of the limit box, a plurality of brush rods are evenly connected to the bottom end of the slide rod in rotation, the second switch valve is adapted to the brush rod, and a push-pull mechanism is provided at the right end of the slide rod, and the push-pull mechanism is used to drive the slide rod to reciprocate in the limit box when the mounting column rotates;

[0016] As a further solution of the present invention, the push-pull mechanism includes a first magnetic block fixedly installed at the right end of the slide rod, and a plurality of second magnetic blocks are fixedly installed on the inner wall of the water washing tower along a circular array below the annular groove, and the plurality of second magnetic blocks are in two states of attraction and repulsion for the first magnetic block, and the second magnetic blocks in the attraction state and the second magnetic blocks in the repulsion state are alternately arranged;

[0017] As a further scheme of the present invention, the detection mechanism includes a rotating tube rotatably connected to the rear end of the water washing tower, the front end of the rotating tube is fixedly installed and connected to a bellows, the front end of the bellows is slidably connected to a wind shield via a compression spring, a plurality of slots are provided on the top of the wind shield, a sensor is installed on the inner side of the front end of the bellows, a fan is fixedly installed at the rear end of the water washing tower, the output end of the fan is rotatably connected to the rear end of the rotating tube, a second motor is fixedly installed at the rear end of the water washing tower, the output end of the second motor and the rear end of the rotating tube are connected via a transmission wheel, a telescopic cylinder is provided at the bottom opening of the bellows via a telescopic mechanism, and the telescopic mechanism is used to drive the telescopic cylinder to extend from the opening of the bellows when the opening of the bellows is upward;

[0018] As a further solution of the present invention, the telescopic mechanism includes a U-shaped ring fixedly installed on the inner wall of the rear end of the water washing tower, the telescopic cylinder is slidably connected to the bottom inner wall of the bellows, the bottom end of the bellows is connected to the bottom end of the telescopic cylinder through a compression spring, and the bottom end of the telescopic cylinder is tightly fitted with the inner wall of the U-shaped ring.

[0019] A washing process for acetonitrile-containing wastewater comprises the following steps:

[0020] Step 1: the tail gas containing acetonitrile is introduced into a water washing tower, and the water washing tower sprays water to wash the tail gas;

[0021] Step 2: During the water washing process, the detection mechanism regularly detects the blockage of the demisting layer. When the demisting layer is blocked, the cleaning mechanism drives the brush roller to clean the upper and lower screens;

[0022] Step 3: While the brush roller is cleaning, the stirring mechanism drives the brush rod to stir the filler balls between the upper and lower mesh plates;

[0023] Step 4: After the water washing is completed, open the first switch valve and the second switch valve, take out the brush roller and the brush rod and clean them.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention arranges a brush roller. When the demisting layer is seriously clogged, the cleaning mechanism drives the lower mesh plate to rotate. The lower mesh plate rotates while the lower brush roller brushes it. The lower mesh plate rotates and drives the upper brush roller to brush the mesh of the upper mesh plate, thereby realizing the dredging operation of the upper mesh plate and the lower mesh plate, avoiding frequent shutdowns to detect and clean the demisting layer during the water washing process, greatly reducing the workload of the staff, making the production and processing more coherent, ensuring that the demisting layer is always in a smooth state during the water washing process, and bringing convenience to the use of the water washing tower.

[0026] 2. The present invention arranges a brush rod. The rotation of the lower mesh plate drives the second material receiving box to rotate through the mounting column. The movement of the second material receiving box drives several brush rods to move. At this time, the brush rod stirs and brushes a large number of filling balls accumulated between the upper mesh plate and the lower mesh plate, so that the adhesion between the filling balls is broken up. When the brush rod brushes the surface of the filling balls, part of the impurities adhered to the surface of the filling balls will be swept away, thereby reducing the accumulation of impurities, further dredging the demisting layer, and enhancing the overall dredging effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a process flow chart of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of the present invention from a front perspective;

[0030] Figure 4 It is a schematic diagram of a partial cross-sectional structure of the present invention from a front-view perspective;

[0031] Figure 5 It is a schematic diagram of a partial cross-sectional structure of the present invention at a front upward viewing angle;

[0032] Figure 6 It is a schematic diagram of the connection structure between the first support frame and the first material receiving box in the present invention;

[0033] Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle;

[0034] Figure 8This is a schematic diagram of the connection structure between the lower mesh plate and the support ring in the present invention;

[0035] Fig. 9 This is a schematic diagram of the connection structure between the upper screen and the second support frame in the present invention;

[0036] Fig.10 For the present invention Fig. 9 The enlarged structural diagram at B in the middle;

[0037] Fig.11 This is a schematic diagram of the internal structure of the present invention from a side perspective;

[0038] Fig.12 For the present invention Fig.11 The enlarged structural diagram at C in the middle;

[0039] Fig.13 For the present invention Fig.11 The enlarged structural diagram at D in the middle;

[0040] Fig.14 It is a schematic diagram of the connection structure between the telescopic cylinder and the U-shaped ring in the present invention;

[0041] Fig.15 It is a schematic diagram of the connection structure between the windshield and the sensor in the present invention.

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] 1. Water washing tower; 2. Demisting layer; 3. Upper screen plate; 4. Lower screen plate; 5. Support ring; 6. Brush roller; 7. Brush rod; 8. First support frame; 9. First material receiving box; 10. First rotating shaft; 11. First combing plate; 12. First switch valve; 13. Gear; 14. Gear ring; 15. First motor; 16. Mounting column; 17. Second support frame; 18. Second material receiving box; 19. Second rotating shaft; 20. Second combing plate; 21. Second switch valve; 22. Annular groove; 23. Spherical block; 24. Wedge rod; 25. Limit box; 26. Sliding rod; 27. First magnetic block; 28. Second magnetic block; 29. ​​Rotating tube; 30. Bellows; 31. Wind shield; 32. Sensor; 33. Fan; 34. Second motor; 35. Transmission wheel; 36. Telescopic cylinder; 37. U-shaped ring. DETAILED DESCRIPTION

[0044] See also Figure 1-Figure 15The present invention provides a technical solution: a water washing system containing acetonitrile wastewater, comprising a water washing tower 1 and a demisting layer 2, wherein the demisting layer 2 comprises an upper screen plate 3 and a lower screen plate 4, wherein the upper screen plate 3 is fixedly connected to the inner wall of the water washing tower 1, wherein a plurality of support rings 5 ​​are fixedly installed on the inner side of the water washing tower 1, wherein the lower screen plates 4 are all located on the inner side of the support rings 5 ​​and are rotatably connected thereto, wherein a detection mechanism is arranged at the bottom of the rear end of the support rings 5, wherein the detection mechanism is used for regularly detecting the blockage of the demisting layer 2, wherein the bottom ends of the upper screen plate 3 and the lower screen plate 4 are both provided with brush rollers 6 through a cleaning mechanism, wherein the cleaning mechanism is used for driving the brush rollers 6 to clean the surfaces of the upper screen plate 3 and the lower screen plate 4 when the detection mechanism detects that the demisting layer 2 is blocked, wherein the bottom end of the upper screen plate 3 is provided with a plurality of brush rods 7 through a stirring mechanism, wherein the stirring mechanism is used for driving the brush rods 7 to stir and brush the filler balls between the upper screen plate 3 and the lower screen plate 4 when the brush rollers 6 clean the upper screen plate 3;

[0045] The cleaning mechanism includes a first support frame 8 fixedly installed below the support ring 5, the right end of the first support frame 8 is slidably connected with the first material receiving box 9 through a locking mechanism, a first rotating shaft 10 is fixedly installed on the top of the right end of the first material receiving box 9, the brush roller 6 is located on the outside of the first rotating shaft 10 and is rotatably connected thereto, a first combing plate 11 is fixedly installed at the top opening of the first material receiving box 9, a first switch valve 12 is installed on the right side of the water washing tower 1, and the first switch valve 12 corresponds to the first material receiving box 9, a gear 13 is rotatably connected to the inner side of the left end of the support ring 5, a gear ring 14 is fixedly installed on the outer side of the lower mesh plate 4, and the gear ring 14 is connected to the gear 13, a first motor 15 is fixedly installed on the bottom of the left end of the support ring 5, and the output end of the first motor 15 is connected to the gear 13, a mounting column 16 is fixedly installed on the middle part of the top end of the lower mesh plate 4, and the top end of the mounting column 16 passes through the mesh plate 3 and is rotatably connected thereto;

[0046] A second support frame 17 is fixedly installed on the right side of the top of the mounting column 16, and a second material receiving box 18 is slidably connected to the top of the second support frame 17. A second rotating shaft 19 is fixedly installed on the top of the right end of the second material receiving box 18. The brush roller 6 is located on the outside of the second rotating shaft 19 and is rotatably connected thereto. A second combing plate 20 is fixedly installed at the top opening of the second material receiving box 18. A second switch valve 21 is installed on the right end of the water washing tower 1. The right end of the second material receiving box 18 corresponds to the second switch valve 21. An annular groove 22 is spliced ​​between the side wall of the second switch valve 21 and the inner wall of the water washing tower 1. A spherical block 23 is fixedly installed on the right end of the second material receiving box 18, and the right end of the spherical block 23 passes through the annular groove 22 and is slidably connected thereto.

[0047] In the initial state, a large number of filling balls are filled between the upper mesh plate 3 and the lower mesh plate 4. To facilitate the structural display of the device, the filling balls are not shown in the figure, and the filling balls are existing mature products.

[0048] During operation, the tail gas containing acetonitrile is introduced into the water washing tower 1, and the water washing tower 1 sprays water to wash the tail gas. As the water washing proceeds, dust and impurities are gradually accumulated in the mesh holes of the upper and lower mesh plates 3 and 4, and at the same time, the filling balls will adhere to each other due to excessive impurities; the detection mechanism regularly detects the blockage of the demisting layer 2. When it is detected that the demisting layer 2 is seriously blocked, the first motor 15 is started, and the first motor 15 starts to drive the lower mesh plate 4 to rotate through the gear 13 and the gear ring 14. At this time, the support ring 5 limits the lower mesh plate 4, and the lower mesh plate 4 drives the brush roller 6 below it to rotate on the outside of the first rotating shaft 10 while rotating. At this time, the brush roller 6 is pressed against the holes of the lower mesh plate 4 The impurities accumulated in the hole are brushed, thereby realizing the dredging operation of the lower mesh plate 4; when the brush roller 6 rotates on the outer side of the first rotating shaft 10, the first combing plate 11 passes through the bristles of the brush roller 6, and the first combing plate 11 removes the impurities adhering to the surface of the brush roller 6, ensuring the cleanliness of the surface of the brush roller 6 and avoiding the secondary pollution of the lower mesh plate 4 by the impurities adhering to the surface of the brush roller 6; the impurities brushed off fall into the first material receiving box 9 for collection. When the washing operation is completed, the staff can open the first switch valve 12, and take out the first material receiving box 9 and the brush roller 6 from the first switch valve 12, so that the two can be cleaned separately;

[0049] When the lower mesh plate 4 rotates, the rotation of the lower mesh plate 4 drives the mounting column 16 to rotate, and the rotation of the mounting column 16 drives the second material receiving box 18 to move through the second support frame 17. When the second material receiving box 18 moves, the spherical block 23 slides in the annular groove 22, thereby ensuring the stability of the second material receiving box 18 when it moves; the second material receiving box 18 moves through the second rotating shaft 19 to drive the brush roller 6 to move synchronously, and the brush roller 6 rolls and brushes on the surface of the lower mesh plate 4 while moving, thereby realizing the dredging operation of the mesh plate 3; when the brush roller 6 rotates on the outer side of the second rotating shaft 19, the second combing plate 20 combs the bristles on the surface of the brush roller 6 in the same way as above; when the washing operation is completed, the staff can open the second switch valve 21, and take out the second material receiving box 18 and the brush roller 6 for cleaning;

[0050] In summary, frequent shutdowns to inspect the demisting layer 2 during the water washing process are avoided, the workload of the staff is greatly reduced, the production and processing are made more continuous, and the demisting layer 2 is ensured to be always in a smooth state during the water washing process, which brings convenience to the use of the water washing tower 1 and solves the problem that the existing water washing tower 1 for washing wastewater containing acetonitrile does not have the function of automatically clearing the demisting layer 2 during the water washing process.

[0051] As a further solution of the present invention, the locking mechanism includes a wedge-shaped rod 24 slidably connected to the right end of the first support frame 8 through a tension spring, and the left side of the top end of the wedge-shaped rod 24 is tightly fitted with the right end of the first material receiving box 9;

[0052] During operation, the wedge rod 24 blocks the right end of the first material receiving box 9 so that the brush roller 6 on the outside of the first rotating shaft 10 can always correspond to the lower mesh plate 4; when the first material receiving box 9 needs to be removed, just push the wedge rod 24 downward until the top of the wedge rod 24 no longer blocks the right end of the first material receiving box 9, and then pull the first material receiving box 9 out from the right end of the first support frame 8.

[0053] As a further solution of the present invention, the bristles on the surface of the brush roller 6 and the brush rod 7 are hard, and the bristles on the surface of the brush roller 6 can penetrate the holes on the surface of the upper mesh plate 3 and the lower mesh plate 4;

[0054] During operation, when the brush roller 6 rotates, the bristles on the outer side thereof completely penetrate the meshes of the upper mesh plate 3 and the lower mesh plate 4, thereby brushing out the debris accumulated in the meshes, making the cleaning effect of the brush roller 6 better.

[0055] As a further solution of the present invention, the stirring mechanism includes a limit box 25 fixedly installed at the bottom end of the second material receiving box 18, a slide bar 26 is slidably connected to the inner side of the bottom end of the limit box 25, a plurality of brush rods 7 are evenly connected to the bottom end of the slide bar 26, the second switch valve 21 is adapted to the brush rod 7, and a push-pull mechanism is provided at the right end of the slide bar 26, which is used to drive the slide bar 26 to reciprocate in the limit box 25 when the mounting column 16 rotates;

[0056] During operation, the second material receiving box 18 moves through the limit box 25 and the slide bar 26 to drive several brush rods 7 to move. At this time, the brush rods 7 stir and brush a large number of filling balls accumulated between the upper mesh plate 3 and the lower mesh plate 4, so that the adhesion between the filling balls is dispersed. When the brush rods 7 brush the surface of the filling balls, the impurities adhered to the surface of the filling balls will be swept away, thereby reducing the accumulation of impurities; when the second material receiving box 18 moves, the push-pull mechanism drives the slide bar 26 to reciprocate on the inner side of the limit box 25, and the movement of the slide bar 26 drives the brush rod 7 to move synchronously, thereby increasing the stirring amplitude of the brush rod 7, so that the filling balls are dispersed more thoroughly; by setting the brush rod 7 to further dredge the demisting layer 2, the overall dredging effect of the device is enhanced.

[0057] As a further solution of the present invention, the push-pull mechanism includes a first magnetic block 27 fixedly installed at the right end of the slide rod 26, and a plurality of second magnetic blocks 28 are fixedly installed on the inner wall of the water washing tower 1 along a circular array below the annular groove 22, and the plurality of second magnetic blocks 28 are in two states of attraction and repulsion for the first magnetic block 27, and the second magnetic blocks 28 in the attraction state and the second magnetic blocks 28 in the repulsion state are alternately arranged;

[0058] During operation, the mounting column 16 rotates through the limit box 25 and the slide bar 26 to drive the first magnetic block 27 to move synchronously. When the first magnetic block 27 is aligned with the second magnetic block 28 in a repulsive state, the first magnetic block 27 drives the slide bar 26 and the brush rod 7 to move toward the mounting column 16 under the action of magnetic force. When the first magnetic block 27 is aligned with the second magnetic block 28 in an attractive state, the first magnetic block 27 drives the slide bar 26 and the brush rod 7 away from the mounting column 16 under the action of magnetic force. The reciprocating operation is repeated to achieve the driving of the slide bar 26 to reciprocate in the limit box 25.

[0059] As a further scheme of the present invention, the detection mechanism includes a rotating tube 29 rotatably connected to the rear end of the water washing tower 1, the front end of the rotating tube 29 is fixedly installed and connected to a bellows 30, the front end of the bellows 30 is slidably connected to a windshield 31 through a compression spring, a plurality of slots are provided on the top of the windshield 31, a sensor 32 is installed on the inner side of the front end of the bellows 30, a fan 33 is fixedly installed at the rear end of the water washing tower 1, the output end of the fan 33 is rotatably connected to the rear end of the rotating tube 29, a second motor 34 is fixedly installed at the rear end of the water washing tower 1, the output end of the second motor 34 and the rear end of the rotating tube 29 are connected through a transmission wheel 35, a telescopic cylinder 36 is provided at the bottom opening of the bellows 30 through a telescopic mechanism, and the telescopic mechanism is used to drive the telescopic cylinder 36 to extend from the opening of the bellows 30 when the opening of the bellows 30 is upward;

[0060] During operation, the second motor 34 is started at a specified frequency. When the second motor 34 is started, the second motor 34 drives the rotating tube 29 to rotate through the transmission wheel 35. The rotating tube 29 drives the bellows 30 to rotate until the bellows 30 rotates 180°. At this time, the second motor 34 stops running, and the telescopic mechanism drives the telescopic cylinder 36 to move upward to fit the lower mesh plate 4. Then the fan 33 starts to blow air into the bellows 30 through the rotating tube 29. When the blockage degree of the demisting layer 2 is low, the air in the bellows 30 is blown into the demisting layer 2 through the telescopic cylinder 36. When the fan 33 stops running after blowing for a certain period of time, the second motor 34 starts again to drive the bellows 30 to rotate 180° to restore to the initial state, waiting for the next detection cycle; by setting the rotating tube 29, the opening of the bellows 30 is downward when the device is not tested, thereby preventing the liquid sprayed from the water washing tower 1 from entering the fan 33 along the rotating tube 29, thereby increasing the service life of the device;

[0061] When the demisting layer 2 is severely clogged, it is difficult for the air in the bellows 30 to penetrate the demisting layer 2 and be blown out through the telescopic cylinder 36. At this time, the air pressure in the bellows 30 increases, gradually pushing the wind shield 31 forward. When the wind shield 31 touches the sensor 32, the first motor 15 starts and performs subsequent cleaning operations. By setting up a detection mechanism, there is no need to frequently stop the machine to check the demisting layer 2 during production and processing, which greatly reduces the workload of the staff and improves the efficiency of production and processing.

[0062] As a further solution of the present invention, the telescopic mechanism includes a U-shaped ring 37 fixedly mounted on the inner wall of the rear end of the water washing tower 1, a telescopic cylinder 36 is slidably connected to the inner wall of the bottom end of the bellows 30, the bottom end of the bellows 30 is connected to the bottom end of the telescopic cylinder 36 through a compression spring, and the bottom end of the telescopic cylinder 36 is tightly fitted to the inner wall of the U-shaped ring 37;

[0063] During operation, when the bellows 30 rotates, the U-shaped ring 37 blocks the telescopic cylinder 36. As the opening of the bellows 30 gradually faces upward, the telescopic cylinder 36 gradually extends from the opening of the bellows 30 under the push of the compression spring until the opening of the bellows 30 is vertically upward. At this time, the telescopic cylinder 36 is no longer blocked by the U-shaped ring 37 and fits with the bottom end of the lower mesh plate 4; when the bellows 30 continues to rotate, the telescopic cylinder 36 is first squeezed by the lower mesh plate 4 and moves into the bellows 30. When the telescopic cylinder 36 contacts the U-shaped ring 37 again, the telescopic cylinder 36 continues to be guided by the U-shaped ring 37 and is retracted into the bellows 30, thereby realizing the telescopic operation of the telescopic cylinder 36, which is convenient when the bellows 30 blows air upward, avoiding a large amount of gas leakage from the gap between the air outlet of the bellows 30 and the lower mesh plate 4, which brings convenience to the detection operation of the device.

[0064] A washing process for acetonitrile-containing wastewater comprises the following steps:

[0065] Step 1: the tail gas containing acetonitrile is introduced into a water washing tower 1, and the water washing tower 1 sprays and washes the tail gas;

[0066] Step 2: During the water washing process, the detection mechanism regularly detects the blockage of the demisting layer 2. When the demisting layer 2 is blocked, the cleaning mechanism drives the brush roller 6 to clean the upper screen 3 and the lower screen 4;

[0067] Step 3: While the brush roller 6 is cleaning, the stirring mechanism drives the brush rod 7 to stir the filler balls between the upper mesh plate 3 and the lower mesh plate 4;

[0068] Step 4: After the washing is completed, open the first switch valve 12 and the second switch valve 21, take out the brush roller 6 and the brush rod 7 and clean them.

Claims

1. A water washing system for acetonitrile wastewater, comprising a water washing tower (1) and a demisting layer (2), characterized in that: The demisting layer (2) comprises an upper mesh plate (3) and a lower mesh plate (4), wherein the upper mesh plate (3) is fixedly connected to the inner wall of the water washing tower (1), a plurality of support rings (5) are fixedly installed on the inner side of the water washing tower (1), and the lower mesh plates (4) are all located on the inner side of the support rings (5) and are rotatably connected thereto, and a detection mechanism is arranged at the bottom of the rear end of the support rings (5), and the detection mechanism is used to periodically detect the blockage of the demisting layer (2). A brush roller (6) is provided through a cleaning mechanism. The cleaning mechanism is used to drive the brush roller (6) to clean the surface of the upper screen plate (3) and the lower screen plate (4) when the detection mechanism detects that the demisting layer (2) is blocked. The bottom end of the upper screen plate (3) is provided with a plurality of brush rods (7) through a stirring mechanism. The stirring mechanism is used to drive the brush rods (7) to stir and brush the filler balls between the upper screen plate (3) and the lower screen plate (4) when the brush roller (6) cleans the upper screen plate (3). The cleaning mechanism comprises a first support frame (8) fixedly installed below the support ring (5); the right end of the first support frame (8) is slidably connected to a first material receiving box (9) via a locking mechanism; a first rotating shaft (10) is fixedly installed on the top of the right end of the first material receiving box (9); the brush roller (6) is located on the outside of the first rotating shaft (10) and is rotatably connected thereto; a first combing plate (11) is fixedly installed at the top opening of the first material receiving box (9); a first switch valve (12) is installed on the right side of the water washing tower (1); and the first switch valve (12) 12) corresponds to the first material receiving box (9), the inner side of the left end of the support ring (5) is rotatably connected with a gear (13), the outer side of the lower mesh plate (4) is fixedly installed with a gear ring (14), the gear ring (14) is connected to the gear (13), the left end bottom of the support ring (5) is fixedly installed with a first motor (15), the output end of the first motor (15) is connected to the gear (13), the middle part of the top end of the lower mesh plate (4) is fixedly installed with a mounting column (16), the top end of the mounting column (16) passes through the mesh plate (3) and is rotatably connected thereto; A second support frame (17) is fixedly installed on the right side of the top end of the mounting column (16), and a second material receiving box (18) is slidably connected to the top end of the second support frame (17). A second rotating shaft (19) is fixedly installed on the top of the right end of the second material receiving box (18). The brush roller (6) is located on the outside of the second rotating shaft (19) and is rotatably connected thereto. A second combing plate (20) is fixedly installed at the top opening of the second material receiving box (18). A second switch valve (21) is installed on the right end of the water washing tower (1). The right end of the second material receiving box (18) corresponds to the second switch valve (21). An annular groove (22) is spliced ​​between the side wall of the second switch valve (21) and the inner wall of the water washing tower (1). A spherical block (23) is fixedly installed on the right end of the second material receiving box (18), and the right end of the spherical block (23) passes through the annular groove (22) and is slidably connected thereto. The locking mechanism comprises a wedge-shaped rod (24) slidably connected to the right end of the first support frame (8) via a tension spring, and the left side of the top end of the wedge-shaped rod (24) is tightly fitted with the right end of the first material receiving box (9).

2. A washing system for acetonitrile-containing wastewater according to claim 1, characterized in that: The bristles on the surface of the brush roller (6) and the brush rod (7) are hard, and the bristles on the surface of the brush roller (6) can penetrate the holes on the surface of the upper mesh plate (3) and the lower mesh plate (4).

3. A washing system for acetonitrile-containing wastewater according to claim 1, characterized in that: The stirring mechanism comprises a limit box (25) fixedly mounted at the bottom end of the second material receiving box (18); a slide rod (26) is slidably connected to the inner side of the bottom end of the limit box (25); a plurality of brush rods (7) are evenly rotatably connected to the bottom end of the slide rod (26); the second switch valve (21) is adapted to the brush rod (7); a push-pull mechanism is arranged at the right end of the slide rod (26); the push-pull mechanism is used to drive the slide rod (26) to reciprocate in the limit box (25) when the mounting column (16) rotates.

4. A washing system for acetonitrile-containing wastewater according to claim 3, characterized in that: The push-pull mechanism comprises a first magnetic block (27) fixedly mounted on the right end of the slide rod (26); a plurality of second magnetic blocks (28) are fixedly mounted on the inner wall of the water washing tower (1) in an annular array below the annular groove (22); the plurality of second magnetic blocks (28) are in an attraction state and a repulsion state with respect to the first magnetic block (27); and the second magnetic blocks (28) in the attraction state and the second magnetic blocks (28) in the repulsion state are alternately arranged.

5. The washing system for acetonitrile-containing wastewater according to claim 1, characterized in that: The detection mechanism comprises a rotating tube (29) rotatably connected to the rear end of the water washing tower (1), the front end of the rotating tube (29) is fixedly installed and connected to a bellows (30), the front end of the bellows (30) is slidably connected to a windshield (31) via a compression spring, the top of the windshield (31) is provided with a plurality of slots, a sensor (32) is installed on the inner side of the front end of the bellows (30), a fan (33) is fixedly installed at the rear end of the water washing tower (1), the output end of the fan (33) is rotatably connected to the rear end of the rotating tube (29), a second motor (34) is fixedly installed at the rear end of the water washing tower (1), the output end of the second motor (34) and the rear end of the rotating tube (29) are connected via a transmission wheel (35), and a telescopic cylinder (36) is provided at the bottom opening of the bellows (30) via a telescopic mechanism, the telescopic mechanism is used to drive the telescopic cylinder (36) to extend from the opening of the bellows (30) when the opening of the bellows (30) is upward.

6. A water washing system containing acetonitrile wastewater according to claim 5, characterized in that: The telescopic mechanism comprises a U-shaped ring (37) fixedly mounted on the inner wall of the rear end of the water washing tower (1); the telescopic cylinder (36) is slidably connected to the inner wall of the bottom end of the bellows (30); the bottom end of the bellows (30) is connected to the bottom end of the telescopic cylinder (36) via a compression spring; the bottom end of the telescopic cylinder (36) is tightly fitted to the inner wall of the U-shaped ring (37).

7. A water washing process for acetonitrile-containing wastewater, applicable to a water washing system for acetonitrile-containing wastewater according to any one of claims 1 to 6, characterized in that: The specific steps of this process are: Step 1: the tail gas containing acetonitrile is introduced into a water washing tower (1), and the water washing tower (1) sprays and washes the tail gas with water; Step 2: During the water washing process, the detection mechanism regularly detects the blockage of the demisting layer (2). When the demisting layer (2) is blocked, the cleaning mechanism drives the brush roller (6) to clean the upper mesh plate (3) and the lower mesh plate (4); Step 3: While the brush roller (6) is cleaning, the stirring mechanism drives the brush rod (7) to stir the filler balls between the upper mesh plate (3) and the lower mesh plate (4); Step 4: After the water washing is completed, open the first switch valve (12) and the second switch valve (21), take out the brush roller (6) and the brush rod (7) and clean them.

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