A methanol recovery column
Patent Information
- Application Number
- CN202610723261.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-25
- Publication Date
- 2026-09-25
AI Technical Summary
[0004]但是，塔板上存在有多个供甲醇气体通过的滤孔，在使用精馏塔回收甲醇的过程中，滤孔可能会由于废液中的杂质以及其他难挥发有机物附着在塔板上从而发生堵塞，而这会导致需要工厂定期对塔内的塔板进行清洁，而清洁过程中精馏塔无法正常进行作业，这会导致甲醇回收的效率降低
1.通过在塔身外部设置塔身套筒，且塔身套筒与塔身外壁之间设置有过渡组件，这使得当塔身内部塔板在进行清洁的过程中，可以将甲醇废液通过第二进料管进入到第二空腔内，经过过渡组件后汇聚在第二空腔的底部并通过再沸循环系统进行加热，最后再循环至第二空腔内，在这个过程中由于甲醇的沸点较低，因此甲醇从废液中被分离处理，气态的甲醇在上升的过程中经过过渡组件后从第二出料管处排出，整个过程独立于塔身回收甲醇的过程，因此，即使塔身内部的塔板需要清洁时，也仍然可以进行甲醇的回收，达到了增加甲醇回收效率的效果。
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Figure CN122806099A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of chemical equipment, and in particular to a methanol recovery tower. Background Technology
[0002] Methanol is an important organic chemical product, mainly used to produce formaldehyde, chloromethane, methylamine, and dimethyl sulfate, among other organic products. It is used extensively in the production of many chemical products. However, much of the methanol is not completely utilized, resulting in significant methanol content in emissions from chemical production processes. Direct discharge of methanol would cause environmental pollution, making methanol recovery crucial in chemical production.
[0003] Currently, most methods for recovering methanol involve using distillation columns. This involves feeding methanol-containing waste liquid into the distillation column through a feed pipe, where the waste liquid flows layer by layer onto the columns. The waste liquid is then heated by a reboiler connected to the bottom of the column. Methanol's low boiling point causes it to turn into a gaseous state, which is then separated from the waste liquid. The gas is discharged through the outlet pipe at the top of the column and condensed, ultimately yielding the recovered methanol.
[0004] However, there are multiple filter holes on the tray for methanol gas to pass through. During the process of using the distillation column to recover methanol, the filter holes may become clogged due to impurities in the waste liquid and other non-volatile organic compounds adhering to the tray. This requires the plant to clean the tray inside the column regularly. During the cleaning process, the distillation column cannot operate normally, which leads to a decrease in the efficiency of methanol recovery. Summary of the Invention
[0005] To improve the efficiency of methanol recovery, this application provides a methanol recovery tower, which adopts the following technical solution: The system includes a tower body and a tower base. The tower body is mounted on the tower base and has a first feed pipe and a first discharge pipe. The tower base has a first cavity communicating with the tower body. A reboiler circulation system communicating with the first cavity is located outside the tower body. The system is characterized by having a tower body sleeve outside the tower body, forming a second cavity between the tower body sleeve and the outer wall of the tower body. The tower body sleeve has a second feed pipe and a second discharge pipe communicating with the second cavity, as well as a third feed pipe and a third discharge pipe communicating with the reboiler circulation system. A transition component is provided inside the second cavity to increase the gas-liquid phase exchange area within the second cavity.
[0006] Preferably, the transition assembly includes multiple first transition pieces and multiple second transition pieces. Each first transition piece is spaced apart on the inner wall of the tower sleeve, and each second transition piece is spaced apart on the outer wall of the tower. The first transition pieces and the second transition pieces are alternately distributed along the height direction of the tower.
[0007] Preferably, the tower sleeve includes two tower body halves, which are detachably connected, and the tower body halves are provided with movable door panels by means of hinges.
[0008] Preferably, a connecting element is provided between the second cavity and the first cavity, and the second cavity is connected to the first cavity when the internal pressure of the first cavity is greater than the internal pressure of the second cavity; the reboiler circulation system includes a reboiler, a fourth feed pipe and a fourth discharge pipe, the third discharge pipe is connected to the fourth discharge pipe, the third feed pipe is connected to the fourth feed pipe, a first valve is provided on both the third feed pipe and the third discharge pipe, and a second valve is provided on both the fourth feed pipe and the fourth discharge pipe.
[0009] Preferably, the connecting member includes a connecting part, a first limiting part, and a second limiting part. One end of the connecting part is located in the first cavity and connected to the first limiting part, and the other end of the connecting part is located in the second cavity and connected to the second limiting part. A conveying channel is provided inside the connecting part. One end of the conveying channel passes through the first limiting part and communicates with the first cavity, and the other end of the conveying channel is located at a position of the connecting part near the second limiting part. When the connecting part moves along its own axis into the second cavity, the end of the conveying channel near the second limiting part is in an open state.
[0010] Preferably, a counterweight is provided on the side of the first limiting part away from the connecting part.
[0011] Preferably, both the side of the first limiting part near the connecting part and the side of the second limiting part near the connecting part are provided with sealing elements.
[0012] Preferably, both the third and fourth discharge pipes are equipped with level gauges.
[0013] In summary, compared with the prior art, the advantages of this application are as follows: 1. By installing a tower sleeve on the outside of the tower body, and a transition component between the tower sleeve and the outer wall of the tower body, methanol waste liquid can be introduced into the second cavity through the second feed pipe during the cleaning process of the tower plates inside the tower body. After passing through the transition component, it gathers at the bottom of the second cavity and is heated by the reboiler circulation system before being circulated back into the second cavity. During this process, because methanol has a low boiling point, it is separated from the waste liquid. The gaseous methanol passes through the transition component as it rises and is discharged from the second discharge pipe. The entire process is independent of the methanol recovery process in the tower body. Therefore, even when the tower plates inside the tower body need to be cleaned, methanol can still be recovered, thus increasing the methanol recovery efficiency.
[0014] 2. The system uses a movable door panel, whose position corresponds to that of the transition component. This allows staff to perform cleaning, inspection, and other maintenance work on the transition component by opening the movable door panel, thus improving the convenience of maintenance. Attached Figure Description
[0015] Figure 1 This is a three-dimensional schematic diagram of a methanol recovery tower according to an embodiment of this application; Figure 2 yes Figure 1 The main view in the middle; Figure 3 yes Figure 2 A schematic diagram of the cross-section after cutting along point AA in the middle; Figure 4 This is a schematic diagram of the principle of a methanol recovery tower in an embodiment of this application.
[0016] Explanation of reference numerals in the attached drawings: 1. Tower body; 2. Tower base; 3. First feed pipe; 4. First discharge pipe; 5. First cavity; 6. Reboiler circulation system; 7. Tower body sleeve; 8. Second cavity; 9. Second feed pipe; 10. Second discharge pipe; 11. Third feed pipe; 12. Third discharge pipe; 13. Transition assembly; 14. First transition piece; 15. Second transition piece; 16. Tower body half-set; 17. Movable door plate; 18. Connecting piece; 19. Reboiler; 20. Fourth feed pipe; 21. Fourth discharge pipe; 22. First valve; 23. Second valve; 24. Connecting part; 25. First limiting part; 26. Second limiting part; 27. Conveying channel; 28. Counterweight; 29. Sealing element; 30. Level gauge. Detailed Implementation
[0017] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.
[0018] Example This application discloses a methanol recovery tower, referring to... Figure 1 , Figure 2 , Figure 3 and Figure 4The system includes a tower body 1 and a tower base 2. The tower body 1 is vertically mounted on the tower base 2. A first cavity 5 communicating with the internal space of the tower body 1 is provided on the tower base 2. A first feed pipe 3 and a first discharge pipe 4 are provided at the top of the tower body 1. A reboiler circulation system 6 communicating with the first cavity 5 inside the tower base 2 is also provided on the outside. A tower body 1 sleeve is fitted on the outside of the tower body 1. A second feed pipe 9 and a second discharge pipe 10 are provided on the tower body 1 sleeve. A second cavity 8 is formed between the inner wall of the tower body 1 sleeve and the outer wall of the tower body 1. A transition component 13 is provided in the second cavity 8. A third feed pipe 11 and a third discharge pipe 12 communicating with the reboiler circulation system 6 are provided on the tower body 1 sleeve. This allows... When the trays inside the tower body 1 need to be cleaned, the waste liquid can be transported to the second cavity 8 through the second feed pipe 9, and after passing through the transition component 13, it accumulates at the bottom of the second cavity 8. Then, it is transported to the reboiler circulation system 6 through the third discharge pipe 12. After being heated, it is pumped back to the second cavity 8 through the third feed pipe 11. At this time, because methanol has a low boiling point, it is separated from the waste liquid, rises through the transition component 13, and is discharged through the second discharge pipe 10. The methanol recovery in the sleeve of the tower body 1 is independent of the tower body 1. Therefore, even if the trays inside the tower body 1 are clean, it will not easily affect the methanol recovery process in the second cavity 8.
[0019] The transition component 13 includes multiple first transition pieces 14 and multiple second transition pieces 15. The first transition pieces 14 are spaced apart on the inner wall of the column body 1 sleeve, while the second transition pieces 15 are spaced apart on the outer wall of the column body 1. The first transition pieces 14 and second transition pieces 15 are alternately distributed along the height direction of the column body 1, thereby forming the structure of a tray-type distillation column. This allows the gaseous methanol to pass through the first transition pieces 14 and second transition pieces 15 during its ascent, increasing the contact area with the waste liquid during heat exchange. It should be noted that since tray-type distillation columns are existing technology, the structure of the first transition pieces 14 and second transition pieces 15 will not be described in detail.
[0020] The tower body 1 sleeve consists of two semi-cylindrical tower body 1 half sleeves. The two tower body 1 half sleeves are assembled by bolting to form the tower body 1 cylinder sleeved on the outside of the tower body 1. The connection surface between the two tower body 1 half sleeves is sealed with a gasket to increase its sealing performance. At the position of the transition component 13 on each tower body 1 half sleeve, a movable door plate 17 is provided by hinge. Similarly, a gasket should be provided on the inner wall of the movable door plate 17 to increase the sealing performance of the movable door plate 17 when closed. After the tower plates inside the tower body 1 are cleaned, the movable door plate 17 can be opened to clean and perform routine maintenance on the first transition component 14 and the second transition component 15 in the second cavity 8 to ensure the normal use of the first transition component 14 and the second transition component 15.
[0021] It is worth mentioning that the second transition piece 15, located outside the tower body 1, not only increases the heat exchange area between the gas and liquid phases during methanol recovery in the second cavity 8, but also acts as a heat dissipation fin for the tower body 1. This allows the operator to accelerate the heat dissipation of the tower body 1 by opening the movable door 17 when the tower body 1 is shut down and methanol recovery is no longer required. Similarly, when the movable door 17 is closed, if the tower body 1 is in operation, the two half-set tower bodies 1 form a closed space outside the tower body 1, which provides a certain degree of insulation for the interior of the tower body 1. This allows the internal temperature of the tower body 1 to remain stable during methanol recovery, reducing the probability of gaseous methanol re-dissolving into the waste liquid due to a decrease in the internal temperature of the tower body 1, and thus improving the methanol recovery efficiency of the tower body 1.
[0022] The reboiler circulation system 6 includes a reboiler 19, a fourth feed pipe 20, and a fourth discharge pipe 21. One end of the fourth feed pipe 20 and one end of the fourth discharge pipe 21 are connected to the reboiler 19, and the other end of the fourth discharge pipe and the other end of the fourth feed pipe 20 are connected to the first cavity 5 in the tower base 2. Water pumps are installed on the fourth feed pipe 20 and the fourth discharge pipe 21, which allows the waste liquid in the first cavity 5 to be pumped into the reboiler 19 through the fourth discharge pipe 21 for heating. After heating, it is pumped back into the first cavity 5 through the fourth feed pipe 20. The third feed pipe 11 and the third discharge pipe 12 are also connected to the reboiler 19, and the waste liquid in the second cavity 8 is also circulated and heated by pumping.
[0023] Furthermore, a connecting member 18 is provided between the second cavity 8 and the first cavity 5. The connecting member 18 is used to connect the first cavity 5 and the second cavity 8 when the pressure inside the first cavity 5 is greater than that inside the second cavity 8. This allows the pressure inside the first cavity 5 to be relieved through the connecting member 18 when the fourth discharge pipe 21 is blocked, causing the pressure inside the first cavity 5 to increase.
[0024] Furthermore, the third feed pipe 11 is connected to the fourth feed pipe 20, and the third discharge pipe 12 is connected to the fourth feed pipe 20. A first valve 22 is installed on both the third feed pipe 11 and the third discharge pipe 12, and a second valve 23 is installed on both the fourth feed pipe 20 and the fourth discharge pipe 21. This allows the waste liquid circulation in the first cavity 5 and the second cavity 8 to be opened and controlled by the first valve 22 and the second valve 23. This not only reduces the number of pipe interfaces required on the reboiler 19, but also allows the operator to perform maintenance on the fourth feed pipe 20 and the fourth discharge pipe 21 by closing the second valve 23 when the connecting parts connect the first cavity 5 and the second cavity 8. At the same time, the reboiling circulation of the waste liquid will not be easily affected.
[0025] It is worth mentioning that the second feed pipe 9 can be connected to the first feed pipe 3, and the second discharge pipe 10 can be connected to the first discharge pipe 4. Valves are respectively installed on the first feed pipe 3, the first discharge pipe 4, the second feed pipe 9 and the second discharge pipe 10 to realize the feeding and discharging of the first cavity 5 or the feeding and discharging of the second cavity 8.
[0026] The connecting member 18 includes a connecting part 24, a first limiting part 25, and a second limiting part 26. One end of the connecting part 24 is located inside the first cavity 5 and is fixedly connected to the first limiting part 25, while the other end of the connecting part 24 is located inside the second cavity 8 and is connected to the second limiting part 26. A conveying channel 27 is provided inside the connecting part 24. The inlet end of the conveying channel 27 passes through the first limiting part 25 and communicates with the first cavity 5, while the outlet end of the conveying channel 27 is located at the end of the connecting part 24 near the second limiting part 26. In the initial state, the second limiting part 26 is located at the bottom of the second cavity 8 and abuts against the bottom surface of the second cavity 8. At this time, the outlet end of the conveying channel 27 is located between the bottom of the tower body 1 half and the base, and is in a closed state. As the amount of waste liquid and the pressure in the first cavity 5 increase, the connecting part 24 will be pushed into the second cavity 8 along its own axis under the action of the pressure in the first cavity 5 until the first limiting part 25 abuts against the top of the first cavity 5. At this time, the outlet end of the conveying channel 27 is in the open state in the second cavity 8, so the waste liquid inside the first cavity 5 can be conveyed to the second cavity 8 through the conveying channel 27, and enter the reboiler 19 for heating through the third discharge pipe 12. Subsequently, the waste liquid is circulated by closing the first valve 22 on the third feed pipe 11 and the second valve 23 on the fourth discharge pipe 21. At this time, the first valve 22 on the third discharge pipe 12 and the second valve 23 on the fourth feed pipe 20 are in the open state.
[0027] Furthermore, a counterweight 28 is provided on the side of the first limiting part 25 away from the connecting part 24. This allows the connecting part 24 to reset to its initial position under the action of the counterweight 28 when the pressure inside the first cavity 5 drops. Furthermore, the counterweight 28 and the first limiting part 25 are configured to be detachably connected, that is, the first cavity 5 and the second cavity 8 can be connected by the counterweight adjustment connector 18 of the counterweight 28, so that the first cavity 5 and the second cavity 8 cannot be easily connected unless necessary.
[0028] Furthermore, a sealing element 29 is provided on the side of the second limiting part 26 near the connecting part 24. The sealing element 29 is a sealing gasket, which ensures that when the second limiting part 26 abuts against the bottom of the second cavity 8 (i.e., the connecting part 24 is in the initial state), the waste liquid in the second cavity 8 will not easily flow through the gap between the second limiting part 26 and the bottom of the second cavity 8 through the outlet end of the conveying channel 27 to the inlet end.
[0029] In other embodiments, multiple connecting parts 24 may be provided, and the number of first limiting parts 25 corresponds to the number of connecting parts 24. The second limiting part 26 is an annular workpiece sleeved on the outside of the tower body 1. Multiple connecting parts 24 are arranged circumferentially on the second limiting part 26, and the ends away from the second limiting part 26 are all located in the first cavity 5 and connected to the first limiting part 25 respectively. Multiple connecting parts 24 achieve the effect of increasing the pressure relief efficiency of the first cavity 5 into the second cavity 8.
[0030] Level gauges 30 are also installed on the third discharge pipe 12 and the fourth discharge pipe 21, respectively. This allows the staff to observe the liquid level in the first cavity 5 and the second cavity 8 through the level gauges 30, thereby ensuring the smooth progress of methanol recovery.
[0031] The implementation principle of this application embodiment is as follows: When methanol is being recovered normally, the waste liquid containing methanol is transported to the inside of the tower body 1 through the first feed pipe 3. After flowing through the tower plates in the tower body 1, the waste liquid containing methanol gathers in the first cavity 5. Then it is pumped to the reboiler 19 through the fourth discharge pipe 21. After being heated by the reboiler 19, it is pumped back to the first cavity 5 through the fourth feed pipe 20. At this time, the methanol is converted into a gas phase and moves from the tower base 2 to the top of the tower. Finally, it is discharged through the first discharge pipe 4 for subsequent condensation.
[0032] When the internal trays of tower 1 need cleaning, the methanol recovery work inside tower 1 can be stopped by closing the first feed pipe 3. At the same time, the waste liquid is discharged into the second cavity 8 from the second feed pipe 9. The methanol-containing waste liquid flows through the first transition piece 14 and the second transition piece 15 and then gathers at the bottom of the second cavity 8. It then flows into the reboiler 19 through the third discharge pipe 12. After being heated by the reboiler 19, it is then transported back into the second cavity 8 through the third feed pipe 11 to complete the methanol recovery.
[0033] When the tower body 1 is in normal operation and the sleeve of the tower body 1 is in a non-operating state, if the waste liquid inside the first cavity 5 cannot circulate due to blockage of the fourth discharge pipe 21 or other reasons, the internal pressure gradually increases as the liquid accumulates inside the first cavity 5. This pushes the first limiting part 25, causing the connecting part 24 to move into the second cavity 8. The outlet end of the conveying channel 27 inside the connecting part 24 then opens. At this time, the waste liquid inside the first cavity 5 can be conveyed to the second cavity 8 through the conveying channel 27 and then to the reboiler 19 through the third discharge channel. Subsequently, it can be conveyed back to the first cavity 5 through the fourth feed pipe 20, thus continuing the methanol recovery process. The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be included within the scope of protection of this application.
Claims
1. A methanol recovery tower, comprising a tower body (1) and a tower base (2), wherein the tower body (1) is disposed on the tower base (2), a first feed pipe (3) and a first discharge pipe (4) are disposed on the tower body (1), a first cavity (5) communicating with the tower body (1) is disposed inside the tower base (2), and a reboiler circulation system (6) communicating with the first cavity (5) is disposed outside the tower body (1), characterized in that: The tower body (1) is provided with a tower body (1) sleeve on the outside. A second cavity (8) is formed between the tower body (1) sleeve and the outer wall of the tower body (1). A second feed pipe (9) and a second discharge pipe (10) communicating with the second cavity (8) are provided on the tower body (1) sleeve, as well as a third feed pipe (11) and a third discharge pipe (12) communicating with the reboiler circulation system (6). A transition component (13) for increasing the gas-liquid phase exchange area in the second cavity (8) is provided inside the second cavity (8).
2. The methanol recovery tower according to claim 1, characterized in that: The transition component (13) includes multiple first transition pieces (14) and multiple second transition pieces (15). Each first transition piece (14) is spaced apart on the inner wall of the sleeve of the tower body (1), and each second transition piece (15) is spaced apart on the outer wall of the tower body (1). The first transition pieces (14) and the second transition pieces (15) are alternately distributed along the height direction of the tower body (1).
3. A methanol recovery tower according to claim 2, characterized in that: The tower body (1) sleeve includes two tower body (1) half sleeves, which are connected in a detachable manner. The tower body (1) half sleeves are provided with movable door panels (17) by hinge.
4. A methanol recovery tower according to claim 2, characterized in that: A connecting member (18) is provided between the second cavity (8) and the first cavity (5). When the pressure inside the first cavity (5) is greater than the pressure inside the second cavity (8), the second cavity (8) is connected to the first cavity (5). The reboiler circulation system (6) includes a reboiler (19), a fourth feed pipe (20) and a fourth discharge pipe (21). The third discharge pipe (12) is connected to the fourth discharge pipe (21), and the third feed pipe (11) is connected to the fourth feed pipe (20). A first valve (22) is provided on both the third feed pipe (11) and the third discharge pipe (12), and a second valve (23) is provided on both the fourth feed pipe (20) and the fourth discharge pipe (21).
5. A methanol recovery tower according to claim 4, characterized in that: The connecting member (18) includes a connecting part (24), a first limiting part (25), and a second limiting part (26). One end of the connecting part (24) is located in the first cavity (5) and connected to the first limiting part (25). The other end of the connecting part (24) is located in the second cavity (8) and connected to the second limiting part (26). A conveying channel (27) is provided inside the connecting part (24). One end of the conveying channel (27) passes through the first limiting part (25) and communicates with the first cavity (5). The other end of the conveying channel (27) is located at the position of the connecting part (24) near the second limiting part (26). When the connecting part (24) moves along its own axis into the second cavity (8), the end of the conveying channel (27) near the second limiting part (26) is in an open state.
6. A methanol recovery tower according to claim 5, characterized in that: A counterweight (28) is provided on the side of the first limiting part (25) away from the connecting part (24).
7. A methanol recovery tower according to claim 5, characterized in that: The second limiting part (26) is provided with a sealing element (29) on the side near the connecting part (24).
8. A methanol recovery tower according to claim 4, characterized in that: Both the third discharge pipe (12) and the fourth discharge pipe (21) are equipped with level gauges (30).