Efficient packed tower for debenzolization of coal coking gas

Abstract

The utility model relates to a coal coking gas debenzolization efficient packed tower which comprises a tower body, a plurality of groups of packing layers are distributed in the middle of the tower body, each packing layer comprises a net cage filled with packing, the net cages abut against the inner wall of the tower body, one side of each net cage is provided with a blocking plate, through grooves are formed in the side wall, corresponding to the blocking plates, of the tower body, and the blocking plates are inserted into the corresponding through grooves in a sleeved mode. A rotating shaft is rotatably arranged at the center of the bottom of the net cage, the top end of the rotating shaft extends into the net cage, a plurality of stirring rods are radially arranged on the peripheral side of the top end of the rotating shaft, and a plurality of stirring supporting rods are radially arranged on the peripheral sides of the stirring rods; a circle of receiving groove is formed in the inner wall of the tower body below the net cage, a distribution box is arranged below the center of the receiving groove, the bottom of the receiving groove is communicated with the peripheral side of the distribution box through a conveying inclined pipe, and a plurality of through holes are formed in the bottom of the distribution box. Efficiency and quality can be guaranteed through redistribution of rich oil and stirring of the filler, the filler can be replaced conveniently, and the device is more practical.

Description

Technical Field

[0001] This utility model belongs to the field of packed tower technology, specifically relating to a high-efficiency packed tower for benzene removal from coal coking gas. Background Technology

[0002] Currently, in coal coking production, the main methods for benzene removal from coal gas include wash oil absorption, freezing, and adsorption. The wash oil absorption process typically includes the following steps: 1. Benzene washing: After cooling, the coal gas enters the benzene washing tower, where it comes into countercurrent contact with wash oil, absorbing benzene hydrocarbons from the coal gas. The washed oil, after absorbing benzene hydrocarbons, is called rich oil. 2. Benzene removal from rich oil: The rich oil, after heating, enters the benzene removal tower, where benzene hydrocarbons are evaporated and released through direct heat transfer via a heat carrier. The benzene removal tower can be a packed tower or a plate tower, the specific choice depending on process requirements and equipment characteristics. 3. Crude benzene recovery: The crude benzene vapor obtained from the top of the benzene removal tower is condensed and separated to obtain crude benzene product. The separated lean oil is returned to the benzene washing tower for recycling. When a packed tower is used as the benzene removal tower, the rich oil enters from the top of the packed tower and flows downwards, coming into countercurrent contact with steam entering from the bottom of the packed tower and flowing upwards. This allows for direct heat transfer through steam contact, distilling and desorbing benzene hydrocarbons from the rich oil. However, in practical applications, the wall flow phenomenon in the packing structure of the packed tower affects the overall benzene removal efficiency and quality, and the replacement of the packing is extremely inconvenient, which needs to be improved. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a high-efficiency packed tower for benzene removal from coal coking gas, which can ensure efficiency and quality through rich oil redistribution and stirring of the packing, and can conveniently replace the packing, thereby solving the above problems.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-efficiency packed tower for benzene removal from coal coking gas, comprising a tower body, a rich oil input pipeline, and a steam input pipeline. The tower body has a square cross-section, with one side of its upper part connected to the rich oil input pipeline, one side of its lower part connected to the steam input pipeline, a drain pipe connected to its bottom, and an exhaust pipe connected to its top. Several packing layers are distributed vertically and horizontally within the tower body. Each packing layer includes a mesh box containing packing material. The mesh box abuts against the inner wall of the tower body, and a sealing plate is fixed to one side of the mesh box. A through groove is formed on the corresponding side wall of the tower body, and the sealing plate is inserted into the corresponding through groove. An mounting plate is fixed to the side of the sealing plate away from the mesh box. The mounting plate abuts against and is detachably connected to the corresponding outer wall of the tower body. A guide rail is fixed to one side of the tower body, and a slider is slidably mounted on the guide rail. The system includes a lifting plate that can be raised and lowered, with one side of the lifting plate detachably connected to the mounting plate. Each mesh cage has a coaxial bottom center and a rotating shaft. The top of the rotating shaft extends into the mesh cage, and several stirring rods are radially arranged on the periphery of this end. Several stirring support rods are radially arranged on the periphery of each stirring rod. A driven plate is fixedly connected to the bottom of the rotating shaft, and a magnetic block is embedded in the bottom of the driven plate. A ring of material receiving grooves is fixedly arranged on the inner wall of the tower below each mesh cage. A distribution box is located below the center of the material receiving grooves. The bottom of the material receiving grooves is connected to the periphery of the distribution box through several conveying inclined pipes. Several through holes are opened at the bottom of the distribution box. A first motor is fixedly arranged on the outer top of the distribution box. The output shaft of the first motor faces upward and is fixedly connected to a driving plate. A magnet is embedded in the top of the driving plate. The driving plate abuts against the driven plate, and the magnet is magnetically attracted to the magnetic block.

[0005] Preferably, square through slots are provided on both the upper and lower ends of the mounting plate. A second motor is embedded in the tower side wall corresponding to the through slot. The output shaft of the second motor is fixedly connected to a limiting plate. The limiting plate passes through the corresponding through slot and the side of the limiting plate near the tower is flush with the outer side of the mounting plate. After the limiting plate rotates 90 degrees, it abuts against the outer side of the mounting plate.

[0006] Preferably, a first hydraulic cylinder is fixedly mounted on the side of the guide rail away from the tower body, and the piston rod of the first hydraulic cylinder faces the direction of the slider and is fixedly connected to the side of the slider.

[0007] Preferably, a third motor is built into the top of the slider, the output shaft of the third motor extends upward out of the slider and is coaxially fixedly connected to a lead screw, a guide rod is fixedly provided on the top of the slider on one side of the lead screw, and the lifting plate is threadedly connected to the lead screw and slidably connected to the guide rod.

[0008] Preferably, a support block is fixedly provided on the middle part of the outer side of the mounting plate, and a blind hole is provided on the top of the support block. A support box is fixedly provided on the side of the lifting plate near the tower body. The support box is open on the side near the tower body, and a second hydraulic cylinder is fixedly mounted on its outer top. The piston rod of the second hydraulic cylinder faces downward and can extend into the support box. The support block is inserted into the support box, and the piston rod of the second hydraulic cylinder corresponds to and is inserted into the blind hole.

[0009] Preferably, the outer side of the first motor is provided with a protective cover.

[0010] Preferably, the sealing plate is adapted to the corresponding through groove, and the bottom surface of the sealing plate is flush with or lower than the bottom surface of the driven plate.

[0011] The beneficial effects of this utility model are as follows: When performing rich oil benzene removal operation, the rich oil heated in the previous process can be transported to the upper part of the tower body through the rich oil input pipeline, so that the rich oil flows from top to bottom. At the same time, steam can be transported to the lower part of the tower body through the steam input pipeline, so that the steam flows from bottom to top. This allows the rich oil and steam to come into countercurrent contact at the packing. Benzene hydrocarbons are distilled and desorbed from the rich oil through direct contact heat transfer of steam. The desorbed liquid material is discharged to the subsequent process through the drain pipe, and the desorbed gas material is discharged to the subsequent process through the exhaust pipe. During the process, the material liquid flowing down from the edge of the packing layer can be collected in the receiving trough and gathered into the distribution box. Then, it can be discharged to the middle of the lower packing layer through the through holes on the distribution box, which can realize the redistribution of the liquid and greatly reduce the adverse effects of wall flow on the desorption effect. At the same time, the first motor can be run to drive the corresponding active disk to rotate at low speed. Then, through the magnetic connection between the active disk and the driven disk, the driven disk and the rotating shaft can be driven to rotate at low speed. The multiple stirring rods on the rotating shaft and the stirring support rods on each stirring rod can be used to stir the packing in the corresponding mesh box to a certain extent, so that the packing is in a state of motion, thereby effectively improving the heat and mass transfer efficiency, increasing the effective gas-liquid contact area, and thus further improving the overall desorption efficiency and quality.

[0012] When the packing needs to be replaced, with the machine stopped, first raise the lifting plate to the height of the corresponding packing. Then, use the slider to move the lifting plate to the location of the packing and connect the mounting plate and the lifting plate via the detachable connection. Next, disconnect the mounting plate from the tower body via the detachable connection. Then, use the slider to move the lifting plate away from the tower body, thus removing the original mesh cage from the tower body and disassembling the original packing layer. Then, lower the corresponding packing layer to the appropriate position and remove it from the lifting plate. Next, install the new packing layer on the lifting plate and raise it to the corresponding installation height. Use the slider to move it closer to the tower body until the corresponding mesh cage is inserted into the tower body. Finally, connect the mounting plate to the tower body and disconnect the mounting plate from the lifting plate. This allows for convenient and flexible replacement of the entire packing layer. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the main structure of the tower body of this utility model;

[0015] Figure 3 This is a schematic diagram of the left-side structure of the tower body of this utility model;

[0016] Figure 4 This is a top view of the tower structure of this utility model;

[0017] Figure 5 This is a schematic diagram of the main structure of the tower body of this utility model without the packing layer installed;

[0018] Figure 6 This is a schematic diagram of the main structure of the receiving trough and distribution box of this utility model;

[0019] Figure 7 This is a schematic diagram of the main structure of the filler layer of this utility model;

[0020] Figure 8 This is a schematic diagram of the left-side structure of the filler layer of this utility model;

[0021] Figure 9 This is a schematic diagram of the main structure of the lifting plate and support box of this utility model;

[0022] Figure 10 This is a front view structural diagram of the support box and mounting plate of this utility model when they are connected.

[0023] The diagram is labeled as follows: 1 is the tower body, 2 is the rich oil input pipeline, 3 is the steam input pipeline, 4 is the drain pipeline, 5 is the exhaust pipeline, 6 is the mesh cage, 7 is the sealing plate, 8 is the through groove, 9 is the mounting plate, 10 is the guide rail, 11 is the slider, 12 is the lifting plate, 13 is the rotating shaft, 14 is the stirring rod, 15 is the stirring support rod, 16 is the driven plate, 17 is the magnetic block, 18 is the receiving trough, 19 is the distribution box, 20 is the conveying inclined pipe, 21 is the through hole, 22 is the first motor, 23 is the driving plate, 24 is the magnet, 25 is the through groove, 26 is the second motor, 27 is the limiting plate, 28 is the first hydraulic cylinder, 29 is the third motor, 30 is the lead screw, 31 is the guide rod, 32 is the support block, 33 is the blind hole, 34 is the support box, 35 is the second hydraulic cylinder, and 36 is the protective cover. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] like Figures 1 to 10 As shown, a high-efficiency packed tower for benzene removal from coal coking gas includes a tower body 1, a rich oil input pipeline 2, and a steam input pipeline 3. The tower body 1 has a square cross-section, with one side of its upper part connected to the rich oil input pipeline 2, one side of its lower part connected to the steam input pipeline 3, a drain pipe 4 connected to its bottom, and an exhaust pipe 5 connected to its top. Several packing layers are distributed vertically and horizontally within the tower body. Each packing layer includes a mesh box 6 containing packing material. The mesh box 6 abuts against the inner wall of the tower body 1, and a sealing plate 7 is fixed on one side of the mesh box 6. A through groove 8 is opened on the side wall of the tower body 1 corresponding to the sealing plate 7, and the sealing plate 7 is inserted into the corresponding through groove 8. An installation plate 9 is fixed on the side of the sealing plate 7 away from the mesh box 6, and the installation plate 9 abuts against the corresponding outer wall of the tower body 1 and is detachably connected. A guide rail 10 is fixed on one side of the tower body 1, and a slider 11 is slidably mounted on the guide rail 10. A lifting plate 12 is raised and lowered on the slider 11, and one side of the lifting plate 12 is detachably connected to the installation plate 9. Each mesh cage 6 has a coaxial rotating shaft 13 at its bottom center. The top of the rotating shaft 13 extends into the mesh cage 6, and several stirring rods 14 are radially arranged on the periphery of this end. Several stirring support rods 15 are radially arranged on the periphery of each stirring rod 14. A driven plate 16 is fixedly connected to the bottom of the rotating shaft 13, and a magnetic block 17 is embedded in the bottom of the driven plate 16. A material receiving groove 18 is fixedly arranged on the inner wall of the tower body 1 below each mesh cage 6. A distribution box 19 is located below the center of the material receiving groove 18. The bottom of the material receiving groove 18 is connected to the periphery of the distribution box 19 through several conveying inclined pipes 20. Several through holes 21 are opened in the bottom of the distribution box 19. A first motor 22 is fixedly arranged on the outer top of the distribution box 19. The output shaft of the first motor 22 faces upward and is fixedly connected to a driving plate 23. A magnet 24 is embedded in the top of the driving plate 23. The driving plate 23 abuts against the driven plate 16, and the magnet 24 is magnetically connected to the magnetic block 17.

[0026] During the rich oil benzene removal operation, the rich oil heated in the previous process can be transported to the upper part of the tower body 1 through the rich oil input pipeline 2, so that the rich oil flows from top to bottom. At the same time, steam can be transported to the lower part of the tower body 1 through the steam input pipeline 3, so that the steam flows from bottom to top. This allows the rich oil and steam to come into countercurrent contact at the packing. Benzene hydrocarbons are distilled and desorbed from the rich oil through direct contact heat transfer of steam. The desorbed liquid material is discharged to the next step through the drain pipe 4, and the desorbed gas material is discharged to the next step through the exhaust pipe 5. During the process, the receiving trough 18 can be used to collect the liquid material flowing down from the edge of the packing layer and collect this liquid material into the distribution box 19. Then, it can be discharged to the middle of the lower packing layer through the through hole 21 on the distribution box 19, which can realize the redistribution of the liquid and greatly reduce the adverse effects of wall flow on the desorption effect. At the same time, the first motor 22 can be operated to drive the corresponding active disk 23 to rotate at low speed. Then, through the magnetic connection between the active disk 23 and the driven disk 16, the driven disk 16 and the rotating shaft 13 can be driven to rotate at low speed. The multiple stirring rods 14 on the rotating shaft 13 and the stirring support rods 15 on each stirring rod 14 can be used to stir the packing in the corresponding mesh box 6 to a certain extent, so that the packing is in a state of motion, thereby effectively improving the heat and mass transfer efficiency, increasing the effective gas-liquid contact area, and thus further improving the overall desorption efficiency and quality. The magnetic block 17 can be made of conventional magnetic metal materials such as iron.

[0027] When the packing needs to be replaced, in the stopped state, first raise the lifting plate 12 to the height of the corresponding packing. Then, move the lifting plate 12 to the location of the packing using the slider 11, and connect the mounting plate 9 and the lifting plate 12 through the detachable connection. Then, disconnect the mounting plate 9 from the tower body 1 through the detachable connection between the mounting plate 9 and the tower body 1. Afterward, use the slider 11 to move the lifting plate 12 away from the tower body 1, thus removing the original mesh box 6 from the tower body 1 and disassembling the original packing layer. Then, lower the corresponding packing layer to the appropriate position and remove it from the lifting plate 12. Next, install the new packing layer on the lifting plate 12 and raise it to the corresponding installation height. Then, use the slider 11 to move it closer to the tower body 1 until the corresponding mesh box 6 is inserted into the tower body 1. After that, complete the connection between the mounting plate 9 and the tower body 1, and then disconnect the connection between the mounting plate 9 and the lifting plate 12. In this way, the entire packing layer can be conveniently disassembled and replaced, making it more flexible and practical.

[0028] In this embodiment, square through slots 25 are provided on both the upper and lower ends of the mounting plate 9. A second motor 26 is embedded in the side wall of the tower body 1 corresponding to the through slot 25. The output shaft of the second motor 26 is fixedly connected to a limiting plate 27. The limiting plate 27 passes through the corresponding through slot 25 and the side of the limiting plate 27 near the tower body 1 is flush with the outer side of the mounting plate 9. After the limiting plate 27 rotates 90 degrees, it abuts against the outer side of the mounting plate 9, so that when the packing layer is installed, after the mesh box 6 is inserted into place, the mounting plate 9 can abut against the outer wall of the corresponding tower body 1, and the limiting plate 27 can correspond to and pass through the corresponding through slot 25. At this time, one side of the limiting plate 27 is flush with the mounting plate 9. Then, the corresponding second motor 26 is started, driving the limiting plate 27 to rotate 90 degrees. This allows the limiting plate 27 to be offset from the corresponding through groove 25 into a perpendicular state, enabling the limiting plate 27 to press against the outer side of the mounting plate 9, locking the mounting plate 9 onto the outer wall of the tower body 1. This completes the fixed installation of the corresponding packing layer without affecting subsequent use. When disassembling the packing layer, simply drive the corresponding second motor 26 to rotate the limiting plate 27 again by 90 degrees, aligning the limiting plate 27 with the corresponding through groove 25. This releases the lock on the mounting plate 9. Then, when the slider 11 moves the entire assembly away from the tower body 1, it moves the mounting plate 9 and the mesh box 6 away from the tower body, thus enabling the disassembly of the corresponding packing layer. The operation is simple, flexible, and practical.

[0029] In this embodiment, a first hydraulic cylinder 28 is fixedly mounted on the side of the guide rail 10 away from the tower body 1. The piston rod of the first hydraulic cylinder 28 faces the direction of the slider 11 and is fixedly connected to the side of the slider 11. This allows sufficient pushing or pulling force to be provided by the extension and retraction of the piston rod of the first hydraulic cylinder when disassembling or assembling the packing layer, so as to drive the slider and the packing layer as a whole to move closer to or away from the tower body, and cooperate in the disassembly and assembly of the packing layer.

[0030] In this embodiment, a third motor 29 is built into the top of the slider 11. The output shaft of the third motor 29 extends upward from the slider 11 and is coaxially fixedly connected to a lead screw 30. A guide rod 31 is fixedly provided on the top of the slider 11 on one side of the lead screw 30. The lifting plate 12 is threadedly connected to the lead screw 30 and slidably connected to the guide rod 31. In actual use, the third motor 29 can drive the lead screw 30 to rotate in both directions, and with the guiding effect of the guide rod 31, the lifting plate 12 can be raised and lowered to facilitate the disassembly and assembly of the filler layer.

[0031] In this embodiment, a support block 32 is fixedly mounted on the middle of the outer side of the mounting plate 9. A blind hole 33 is opened on the top of the support block 32. A support box 34 is fixedly mounted on the side of the lifting plate 12 near the tower body 1. The side of the support box 34 near the tower body 1 is open, and a second hydraulic cylinder 35 is fixedly mounted on its outer top. The piston rod of the second hydraulic cylinder 35 faces downward and can extend into the support box 34. The support block 32 is inserted into the support box 34. The piston rod of the second hydraulic cylinder 35 corresponds to and is inserted into the blind hole 33, so that when connecting the lifting plate 12 and the mounting plate 9, it is only necessary to first connect the corresponding... The support block 32 is inserted into the support box 34. Then, the second hydraulic cylinder 35 is operated to extend its piston rod and insert it into the corresponding blind hole 33, thus locking the support block 32 in place. When disconnecting the connection between the lifting plate 12 and the mounting plate 9, the second hydraulic cylinder 35 is operated again to retract and reset its piston rod, thereby releasing the locking of the support block 32. Then, the lifting plate 12 moves away from the tower body 1, allowing the support block 32 to separate from the support box 34, completing the disassembly of the mounting plate 9 and the lifting plate 12, so as to facilitate the disassembly and assembly of the packing layer.

[0032] In this embodiment, a protective cover 36 is provided on the outer side of the first motor 22 to effectively shield and protect the first motor 22 and ensure the service life of the first motor 22.

[0033] In this embodiment, the sealing plate 7 is adapted to the corresponding through groove 8 to ensure the sealing effect of the through groove 8 after the packing layer is installed, so as not to affect the smooth progress of the corresponding operation. The bottom surface of the sealing plate 7 is flush with or lower than the bottom surface of the driven plate 16 to ensure that the packing layer can pass smoothly through the through groove 8, so as to realize the disassembly and assembly of the packing layer.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency packed column for the removal of benzene from coal coking gas, comprising a column body, an oil-rich input line and a steam input line, characterized in that, The cross section of the tower body is square, and the upper side thereof is communicated with the rich oil input pipeline, the lower side thereof is communicated with the steam input pipeline, the bottom thereof is communicated with the liquid discharge pipeline, the top thereof is communicated with the exhaust pipeline, and a plurality of groups of packing layers are distributed in the middle of the tower body in an up-down interval. The packing layer comprises a net box containing packing, the net box abuts against the inner wall of the tower body, and a blocking plate is fixed on one side of the net box. A through slot is formed in the corresponding side wall of the tower body, the blocking plate is inserted into the corresponding through slot, a mounting plate is fixed on the side of the blocking plate away from the net box, the mounting plate abuts against the corresponding outer side wall of the tower body and is detachably connected, a guide rail is fixed on one side of the tower body, a sliding block is slidably arranged on the guide rail, a lifting plate is liftably arranged on the sliding block, one side of the lifting plate is detachably connected with the mounting plate, a rotating shaft is coaxially and rotatably arranged at the bottom center of each net box, the top end of the rotating shaft extends into the net box, and a plurality of stirring rods are radially arranged on the circumferential side of the top end of the rotating shaft, a plurality of stirring branch rods are radially arranged on the circumferential side of each stirring rod, a driven disc is fixedly connected to the bottom end of the rotating shaft, a magnetic block is embedded in the bottom of the driven disc, a receiving groove is fixedly arranged on the inner wall of the tower body below each net box, a distribution box is arranged below the center of the receiving groove, the bottom of the receiving groove is communicated with the circumferential side of the distribution box through a plurality of conveying inclined pipes, a plurality of through holes are formed in the bottom of the distribution box, a first motor is fixedly arranged on the outer top of the distribution box, the output shaft of the first motor faces upward and is fixedly connected with a driving disc, a magnet is embedded in the top of the driving disc, the driving disc abuts against the driven disc, and the magnet is magnetically connected with the magnetic block.

2. The coal coking gas debenzene efficient packing column according to claim 1, characterized in that, Square through slots are formed in the upper and lower ends of the mounting plate, a second motor is embedded in the corresponding side wall of the tower body, the output shaft of the second motor is fixedly connected with a limiting plate, the limiting plate passes through the corresponding through slot, and the side of the limiting plate close to the tower body is flush with the outer side of the mounting plate. The limiting plate abuts against the outer side of the mounting plate after being rotated by 90 degrees.

3. The coal coking gas debenzene efficient packing column according to claim 1, characterized in that, A first hydraulic cylinder is fixedly arranged on the side of the guide rail away from the tower body, and the piston rod of the first hydraulic cylinder faces the direction of the sliding block and is fixedly connected with the side of the sliding block.

4. The coal coking gas debenzolizing high-efficiency packed column according to claim 1, characterized in that, A third motor is arranged in the top of the sliding block, the output shaft of the third motor extends out of the sliding block and is coaxially fixedly connected with a lead screw, a guide rod is fixedly arranged on the top of the side of the sliding block, the lifting plate is threadedly sleeved with the lead screw and slidably sleeved with the guide rod.

5. The coal coking gas debenzolizing high-efficiency packed column according to claim 1, characterized in that, A support block is fixedly arranged on the middle of the outer side of the mounting plate, a blind hole is formed in the top of the support block, a support box is fixedly arranged on the side of the lifting plate close to the tower body, the side of the support box close to the tower body is open, a second hydraulic cylinder is fixedly arranged on the outer top of the support box, the piston rod of the second hydraulic cylinder faces downward and can extend into the support box, the support block is inserted into the support box, and the piston rod of the second hydraulic cylinder corresponds to the blind hole and is inserted.

6. The coal coking gas debenzolizing high-efficiency packed column according to claim 1, characterized in that, A protective cover is arranged on the outer side of the first motor.

7. The coal coking gas debenzolizing high-efficiency packed column according to claim 1, characterized in that, The bottom surface of the blocking plate is flush with or lower than the bottom surface of the driven disc.

Images