Tower bottom film evaporator switching cleaning system
By setting up two sets of film evaporators at the bottom of the refined tower and using the bottom valve switching and flushing and purge pipeline system, the problem of untimely material recycling and equipment blockage during the cleaning of the film evaporator is solved, and efficient and safe cleaning effect is achieved.
Patent Information
- Application Number
- CN202421724843.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-07-19
AI Technical Summary
In the production of butyl acrylate, when the film evaporator needs to be stopped for too long, the material cannot be recycled in time, resulting in increased losses, and the discharge port and pipeline at the bottom of the film evaporator are easily blocked, affecting production stability.
Two sets of film evaporators are set up at the bottom of the refined tower. By switching the bottom discharge valve and the return valve, combined with the flushing and purge pipeline system, the film evaporator is flushed and backflushed to ensure production continuity and safety.
It realizes efficient cleaning of film evaporators, avoids production interruptions and material losses, ensures production safety, improves production efficiency and long-term stable operation of equipment.
Smart Images
Figure CN223043261U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a switching cleaning system for a thin-film evaporator at the bottom of a tower. Background Art
[0002] During the normal production of butyl acrylate, the thin-film evaporator serves as the reboiler of the refining tower in the butyl ester unit. It is heated with steam as the heat source. The generated gas phase is distilled out from the top of the thin-film evaporator as the recovered butyl acrylate and enters the bottom of the refining tower, and the liquid phase part, which is the heavy components, is pumped out.
[0003] In actual production, when the thin-film evaporator has been used for too long, it needs to be shut down for cleaning. However, the shutdown will cause some materials to not be recovered in time, resulting in an increase in losses when entering the waste oil. At the same time, the bottom discharge port of the thin-film evaporator, the front and rear of the pump, and the pipelines connected to it are extremely prone to blockage, which are cleaning dead corners. The cleaning of the thin-film evaporator cannot be limited to the thin-film evaporator itself. The smoothness of the pipelines and connection ports is also the key directly affecting whether the thin-film evaporator can operate stably in the long term. Content of the Utility Model
[0004] The utility model provides a switching cleaning system for a thin-film evaporator at the bottom of a tower to solve the problems that during the production process, shutting down the thin-film evaporator causes materials to not be recovered in time, resulting in an increase in losses when entering the waste oil, and the bottom discharge port of the thin-film evaporator, the front and rear of the pump, and the pipelines connected to it are easily overlooked during the cleaning process.
[0005] To solve the above problems, the technical solution of the utility model is as follows:
[0006] The switching cleaning system for a thin-film evaporator at the bottom of the tower described in the utility model includes a refining tower. There are two sets of thin-film evaporators at the bottom of the refining tower. The refining tower is connected to the thin-film evaporator through a bottom discharge pipe. The top of the thin-film evaporator is connected to the bottom of the refining tower through a bottom return pipe. A bottom discharge valve and a bottom discharge blind plate are provided on the bottom discharge pipe. A bottom return valve and a bottom return blind plate are provided on the bottom return pipe. The bottom of the thin-film evaporator is connected to the heavy component transportation pipe through an evaporator discharge pipe and a transportation pump. A cleaning pipeline system is provided on the evaporator discharge pipe and the heavy component transportation pipe. An evaporator discharge valve is provided on the evaporator discharge pipe.
[0007] By providing two sets of thin-film evaporators at the bottom of the refining tower, it can be ensured that when one of the thin-film evaporators needs to be cleaned, the other can be switched for use, so that the production process is not interrupted, the production efficiency is improved, and at the same time, the problem that shutting down the thin-film evaporator causes some materials to not be recovered in time, resulting in an increase in losses when entering the waste oil is avoided.
[0008] A first thin-film evaporator and a second thin-film evaporator are provided at the bottom of the refining tower.
[0009] The refining tower is connected to the first thin-film evaporator through the first bottom discharge pipe. The top of the first thin-film evaporator is connected to the bottom of the refining tower through the first bottom reflux pipe. The first bottom discharge pipe is provided with a first bottom discharge valve and a first bottom discharge blind plate. The first bottom reflux pipe is provided with a first bottom reflux valve and a first bottom reflux blind plate. The bottom of the first thin-film evaporator is connected to the first heavy component transport pipe through the first evaporator discharge pipe and the first transport pump. The first evaporator discharge pipe and the first heavy component transport pipe are provided with a first cleaning pipeline system, and the first evaporator discharge pipe is provided with a first evaporator discharge valve.
[0010] The refining tower is connected to the second thin-film evaporator through the second bottom discharge pipe. The top of the second thin-film evaporator is connected to the bottom of the refining tower through the second bottom reflux pipe. The second bottom discharge pipe is provided with a second bottom discharge valve and a second bottom discharge blind plate. The second bottom reflux pipe is provided with a second bottom reflux valve and a second bottom reflux blind plate. The bottom of the second thin-film evaporator is connected to the second heavy component transport pipe through the second evaporator discharge pipe and the second transport pump. The second evaporator discharge pipe and the second heavy component transport pipe are provided with a second cleaning pipeline system, and the second evaporator discharge pipe is provided with a second evaporator discharge valve.
[0011] The utility model adopts a bottom discharge valve and a bottom discharge blind plate, and the settings of the bottom reflux valve and the bottom reflux blind plate cut out the first thin-film evaporator or the second thin-film evaporator from the refining tower system. The blind plate can effectively isolate the medium in the pipeline, prevent leakage during cleaning, ensure the safety of the staff, and at the same time can quickly complete the cutting-off or restoration process without stopping the entire production line.
[0012] The cleaning pipeline system includes a flushing and purging pipe, and the flushing and purging pipe is divided into four paths: an evaporator flushing pipe, an evaporator backflushing pipe, a pre-pump flushing pipe, and a post-pump flushing pipe. The evaporator flushing pipe is connected to the top of the thin-film evaporator. The evaporator backflushing pipe is connected to the position of the evaporator discharge pipe near the bottom of the thin-film evaporator. The pre-pump flushing pipe is connected to the position of the evaporator discharge pipe near the transport pump. The post-pump flushing pipe is connected to the heavy component transport pipe.
[0013] The evaporator flushing pipe, the evaporator backflushing pipe, the pre-pump flushing pipe, and the post-pump flushing pipe are provided with an evaporator flushing valve, an evaporator backflushing valve, a pre-pump flushing valve, and a post-pump flushing valve.
[0014] The evaporator discharge valve is located between the connection positions of the evaporator backflushing pipe and the pre-pump flushing pipe on the evaporator discharge pipe.
[0015] A heavy component transport valve is arranged on the heavy component transport pipe, and the connection position of the post-pump flushing pipe and the heavy component transport pipe is at the end of the heavy component transport valve near the transport pump.
[0016] By setting up the evaporator flushing pipe, the evaporator backflushing pipe, the pre-pump flushing pipe and the post-pump flushing pipe, the thin-film evaporator can be flushed forward and backward, and the bottom discharge port of the thin-film evaporator, the front and rear of the pump and the pipelines connected thereto can be flushed and purged, so as to achieve thorough cleaning of the thin-film evaporator and its supporting pipelines and transfer pumps.
[0017] A flushing and discharging pipe is provided on the heavy component transfer pipe.
[0018] Further, the first cleaning pipeline system includes a first flushing and purging pipe, which is divided into four paths: a first evaporator flushing pipe, a first evaporator backflushing pipe, a first pre-pump flushing pipe and a first post-pump flushing pipe. The first evaporator flushing pipe is connected to the top of the first thin-film evaporator, the first evaporator backflushing pipe is connected to the position of the first evaporator discharge pipe near the bottom of the first thin-film evaporator, the first pre-pump flushing pipe is connected to the position of the first evaporator discharge pipe near the first transfer pump, and the first post-pump flushing pipe is connected to the first heavy component transfer pipe.
[0019] Further, a first evaporator flushing valve, a first evaporator backflushing valve, a first pre-pump flushing valve and a first post-pump flushing valve are provided on the first evaporator flushing pipe, the first evaporator backflushing pipe, the first pre-pump flushing pipe and the first post-pump flushing pipe.
[0020] Further, the first evaporator discharge valve is located between the connection positions of the first evaporator backflushing pipe and the first pre-pump flushing pipe on the first evaporator discharge pipe.
[0021] Further, the first evaporator discharge valve is located between the connection positions of the first evaporator backflushing pipe and the first pre-pump flushing pipe on the first evaporator discharge pipe.
[0022] Further, a first heavy component transfer valve is provided on the first heavy component transfer pipe, and the connection position of the first post-pump flushing pipe and the first heavy component transfer pipe is located at the end of the first heavy component transfer valve close to the first transfer pump.
[0023] Further, the second cleaning pipeline system includes a second flushing and purging pipe, which is divided into four paths: a second evaporator flushing pipe, a second evaporator backflushing pipe, a second pre-pump flushing pipe and a second post-pump flushing pipe. The second evaporator flushing pipe is connected to the top of the second thin-film evaporator, the second evaporator backflushing pipe is connected to the position of the second evaporator discharge pipe near the bottom of the second thin-film evaporator, the second pre-pump flushing pipe is connected to the position of the second evaporator discharge pipe near the second transfer pump, and the second post-pump flushing pipe is connected to the second heavy component transfer pipe.
[0024] Further, a second evaporator flushing valve, a second evaporator backflushing valve, a second pre-pump flushing valve and a second post-pump flushing valve are provided on the second evaporator flushing pipe, the second evaporator backflushing pipe, the second pre-pump flushing pipe and the second post-pump flushing pipe.
[0025] Further, the second evaporator discharge valve is located between the connection of the second evaporator backflush pipe and the second pump pre-flush pipe on the second evaporator discharge pipe.
[0026] Further, the second evaporator discharge valve is located between the connection of the second evaporator backflush pipe and the second pump pre-flush pipe on the second evaporator discharge pipe.
[0027] Further, a second heavy component transport valve is provided on the second heavy component transport pipe, and the connection of the second pump post-flush pipe and the second heavy component transport pipe is located at the end of the second heavy component transport valve close to the second transport pump.
[0028] Working principle:
[0029] During normal production, the second bottom reflux valve, the second bottom reflux blind plate, the second bottom discharge valve, and the second bottom discharge blind plate on the second thin film evaporator are in the closed state. When the first thin film evaporator needs to be cleaned, the second bottom reflux valve, the second bottom reflux blind plate, the second bottom discharge valve, and the second bottom discharge blind plate are opened, and the second thin film evaporator is enabled. The first bottom reflux valve, the first bottom reflux blind plate, the first bottom discharge valve, and the first bottom discharge blind plate are opened to cut the first thin film evaporator out of the refining column. After using the first transport pump to empty the heavy components at the bottom of the first thin film evaporator, the first heavy component transport valve is closed, and the first evaporator flush valve on the first evaporator flush pipe is opened. The cleaning water from the first flush purge pipe enters the first thin film evaporator for flushing, and then flows along the first evaporator discharge pipe through the first transport pump and is discharged through the first heavy component transport pipe and the first flush drain pipe. Then the first evaporator discharge valve is closed, and the first evaporator backflush valve on the first evaporator backflush pipe is opened to perform backflushing on the first thin film evaporator and its discharge port. The first pump pre-flush valve on the first pump pre-flush pipe is opened to flush the first evaporator discharge pipe, the first heavy component transport pipe, and their connections before and after the first transport pump, and the flushing water is discharged from the first flush drain pipe. The first evaporator flush valve on the first evaporator flush pipe is opened, the first evaporator discharge valve is closed, water is filled into the first thin film evaporator, and then heated and boiled for washing, and finally discharged from the first flush drain pipe. Finally, the purge gas from the first flush purge pipe is used to purge and cool the first thin film evaporator, the first evaporator discharge pipe, the first transport pump, the first heavy component transport pipe, and the first flush drain pipe to complete the cleaning process.
[0030] The beneficial effects of the present utility model are as follows:
[0031] (1) By arranging two sets of thin-film evaporators at the bottom of the refining tower, the utility model can ensure that when one set of thin-film evaporators needs to be cleaned, the other set can be switched for use, so that the production process is not interrupted, the production efficiency is improved, and at the same time, the problem that some materials cannot be recycled in time due to the shutdown of the thin-film evaporator and enter the waste oil, resulting in an increase in losses, is avoided.
[0032] (2) The utility model adopts the settings of the bottom discharge valve and the bottom discharge blind plate of the tower, and the bottom reflux valve and the bottom reflux blind plate of the tower to cut the first thin-film evaporator or the second thin-film evaporator out of the refining tower system. The blind plate can effectively isolate the medium in the pipeline, prevent leakage during cleaning, ensure the safety of the staff, and at the same time, the cutting-off or recovery process can be completed quickly without stopping the entire production line.
[0033] (3) By arranging the evaporator flushing pipe, the evaporator backwashing pipe, the pre-pump flushing pipe and the post-pump flushing pipe, the utility model can perform forward flushing and backwashing on the thin-film evaporator, and flush and purge the bottom discharge port of the thin-film evaporator, before and after the pump, and the pipelines connected thereto, so as to achieve thorough cleaning of the thin-film evaporator and its supporting pipelines and transfer pumps. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] The drawings described herein are used to provide a further understanding of the utility model and constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an improper limitation of the utility model. In the drawings:
[0035] Figure 1 is a schematic structural diagram of the bottom thin-film evaporator switching cleaning system of the utility model;
[0036] In the figure: 1, refining tower; 2, first thin-film evaporator; 3, first bottom discharge pipe of the tower; 301, first bottom discharge valve of the tower; 302, first bottom discharge blind plate; 4, first bottom reflux pipe of the tower; 401, first bottom reflux valve of the tower; 402, first bottom reflux blind plate; 5, first flushing and purging pipe; 6, first backwashing pipe of the evaporator; 601, first backwashing valve of the evaporator; 7, first pre-pump flushing pipe; 701, first pre-pump flushing valve; 8, first post-pump flushing pipe; 801, first post-pump flushing valve; 9, first evaporator discharge pipe; 901, first evaporator discharge valve; 10, first heavy component transportation pipe; 1001, first heavy component transportation valve; 11, first flushing and discharging pipe; 12, first transportation pump; 13, second thin-film evaporator; 14, second bottom discharge pipe of the tower; 1401, second bottom discharge valve of the tower; 1402, second bottom discharge blind plate; 15, second bottom reflux pipe of the tower; 1501, second bottom reflux valve of the tower; 1502, second bottom reflux blind plate; 16, second flushing and purging pipe; 17, second backwashing pipe of the evaporator; 1701, second backwashing valve of the evaporator; 18, second pre-pump flushing pipe; 1801, second pre-pump flushing valve; 19, second post-pump flushing pipe; 1901, second post-pump flushing valve; 20, second evaporator discharge pipe; 2001, second evaporator discharge valve; 21, second heavy component transportation pipe; 2101, second heavy component transportation valve; 22, second flushing and discharging pipe; 23, second transportation pump; 24, first evaporator flushing pipe; 2401, first evaporator flushing valve; 25, second evaporator flushing pipe; 2501, second evaporator flushing valve. Detailed implementation mode
[0037] The following is a understandable description of the present utility model in combination with embodiments.
[0038] Embodiment
[0039] As Figure 1 shown, the bottom thin-film evaporator switching and cleaning system includes a refining tower 1, and a first thin-film evaporator 2 and a second thin-film evaporator 13 are provided at the bottom of the refining tower 1.
[0040] The refining tower 1 is connected to the first thin-film evaporator 2 through the first bottom discharge pipe 3 of the tower, the top of the first thin-film evaporator 2 is connected to the bottom of the refining tower 1 through the first bottom reflux pipe 4 of the tower. A first bottom discharge valve 301 and a first bottom discharge blind plate 302 are provided on the first bottom discharge pipe 3 of the tower, a first bottom reflux valve 401 and a first bottom reflux blind plate 402 are provided on the first bottom reflux pipe 4 of the tower. The bottom of the first thin-film evaporator 2 is connected to the first heavy component transportation pipe 10 through the first evaporator discharge pipe 9 and the first transportation pump 12. A first cleaning pipeline system is provided on the first evaporator discharge pipe 9 and the first heavy component transportation pipe 10, and a first evaporator discharge valve 901 is provided on the first evaporator discharge pipe 9.
[0041] The refining tower 1 is connected to the second thin film evaporator 13 through the second bottom discharge pipe 14. The top of the second thin film evaporator 13 is connected to the bottom of the refining tower 1 through the second bottom reflux pipe 15. A second bottom discharge valve 1401 and a second bottom discharge blind plate 1402 are provided on the second bottom discharge pipe 14. A second bottom reflux valve 1501 and a second bottom reflux blind plate 1502 are provided on the second bottom reflux pipe 15. The bottom of the second thin film evaporator 13 is connected to the second heavy component transport pipe 21 through the second evaporator discharge pipe 20 and the second transport pump 23. A second cleaning pipeline system is provided on the second evaporator discharge pipe 20 and the second heavy component transport pipe 21. A second evaporator discharge valve 2001 is provided on the second evaporator discharge pipe 20.
[0042] By arranging two sets of thin film evaporators at the bottom of the refining tower 1, it can be ensured that when one set of thin film evaporators needs to be cleaned, the other set can be switched for use, so that the production process is not interrupted, the production efficiency is improved, and at the same time, the problem that some materials cannot be recycled in time due to the shutdown of the thin film evaporator and the loss increases due to entering the waste oil is avoided.
[0043] By setting the bottom discharge valve, bottom discharge blind plate, bottom reflux valve and bottom reflux blind plate, the first thin film evaporator 2 or the second thin film evaporator 13 is cut out of the refining tower 1 system. The blind plate can effectively isolate the medium in the pipeline, prevent leakage during cleaning, ensure the safety of the staff, and at the same time, the cutting-off or restoration process can be quickly completed without stopping the entire production line.
[0044] The first cleaning pipeline system includes a first flushing and purging pipe 5. The first flushing and purging pipe 5 is divided into four paths: a first evaporator flushing pipe 24, a first evaporator backwashing pipe 6, a first pre-pump flushing pipe 7 and a first post-pump flushing pipe 8. The first evaporator flushing pipe 24 is connected to the top of the first thin film evaporator 2. The first evaporator backwashing pipe 6 is connected to the first evaporator discharge pipe 9 near the bottom of the first thin film evaporator 2. The first pre-pump flushing pipe 7 is connected to the first evaporator discharge pipe 9 near the first transport pump 12. The first post-pump flushing pipe 8 is connected to the first heavy component transport pipe 10.
[0045] A first evaporator flushing valve 2401, a first evaporator backwashing valve 601, a first pre-pump flushing valve 701 and a first post-pump flushing valve 801 are provided on the first evaporator flushing pipe 24, the first evaporator backwashing pipe 6, the first pre-pump flushing pipe 7 and the first post-pump flushing pipe 8.
[0046] The first evaporator discharge valve 901 is located between the connection points of the first evaporator backwashing pipe 6 and the first pre-pump flushing pipe 7 on the first evaporator discharge pipe 9.
[0047] The first evaporator discharge valve 901 is located between the connection of the first evaporator backwash pipe 6 and the first pump pre-flush pipe 7 on the first evaporator discharge pipe 9.
[0048] A first heavy component transport valve 1001 is provided on the first heavy component transport pipe 10. The connection of the first pump post-flush pipe 8 and the first heavy component transport pipe 10 is located at the end of the first heavy component transport valve 1001 close to the first transport pump 12.
[0049] A first flush discharge pipe 11 is opened on the first heavy component transport pipe 10.
[0050] The second cleaning pipeline system includes a second flush and purge pipe 16. The second flush and purge pipe 16 is divided into four paths: a second evaporator flush pipe 25, a second evaporator backwash pipe 17, a second pump pre-flush pipe 18, and a second pump post-flush pipe 19. The second evaporator flush pipe 25 is connected to the top of the second thin film evaporator 13. The second evaporator backwash pipe 17 is connected to the position of the second evaporator discharge pipe 20 close to the bottom of the second thin film evaporator 13. The second pump pre-flush pipe 18 is connected to the position of the second evaporator discharge pipe 20 close to the second transport pump 23. The second pump post-flush pipe 19 is connected to the second heavy component transport pipe 21.
[0051] Second evaporator flush valves 2501, second evaporator backwash valves 1701, second pump pre-flush valves 1801, and second pump post-flush valves 1901 are provided on the second evaporator flush pipe 25, the second evaporator backwash pipe 17, the second pump pre-flush pipe 18, and the second pump post-flush pipe 19.
[0052] The second evaporator discharge valve 2001 is located between the connection of the second evaporator backwash pipe 17 and the second pump pre-flush pipe 18 on the second evaporator discharge pipe 20.
[0053] The second evaporator discharge valve 2001 is located between the connection of the second evaporator backwash pipe 17 and the second pump pre-flush pipe 18 on the second evaporator discharge pipe 20.
[0054] A second heavy component transport valve 2101 is provided on the second heavy component transport pipe 21. The connection of the second pump post-flush pipe 19 and the second heavy component transport pipe 21 is located at the end of the second heavy component transport valve 2101 close to the second transport pump 23.
[0055] A second flush discharge pipe 22 is opened on the second heavy component transport pipe 21.
[0056] Through the settings of the evaporator flush pipe, the evaporator backwash pipe, the pump pre-flush pipe, and the pump post-flush pipe, the thin film evaporator can be flushed forward and backward, and the bottom discharge port of the thin film evaporator, the front and rear of the pump, and the pipelines connected thereto can be flushed and purged, so that the thorough cleaning of the thin film evaporator and its supporting pipelines and transport pumps can be achieved.
[0057] Working principle:
[0058] During normal production, the second bottom reflux valve 1501, the second bottom reflux blind plate 1502, the second bottom discharge valve 1401, and the second bottom discharge blind plate 1402 on the second thin-film evaporator 13 are in the closed state. When the first thin-film evaporator 2 needs to be cleaned, the second bottom reflux valve 1501, the second bottom reflux blind plate 1502, the second bottom discharge valve 1401, and the second bottom discharge blind plate 1402 are opened, and the second thin-film evaporator 13 is enabled. The first bottom reflux valve 401, the first bottom reflux blind plate 402, the first bottom discharge valve 301, and the first bottom discharge blind plate 302 are opened to cut the first thin-film evaporator 2 out of the refining column 1. After the heavy components at the bottom of the first thin-film evaporator 2 are emptied using the first transfer pump 12, the first heavy-component transfer valve 1001 is closed, and the first evaporator flushing valve 2401 on the first evaporator flushing pipe 24 is opened. The cleaning water from the first flushing and purging pipe 5 enters the first thin-film evaporator 2 for flushing, and then flows out through the first evaporator discharge pipe 9, the first transfer pump 12, the first heavy-component transfer pipe 10, and the first flushing and discharging pipe 11. Then the first evaporator discharge valve 901 is closed, and the first evaporator backwashing valve 601 on the first evaporator backwashing pipe 6 is opened to perform backwashing on the first thin-film evaporator 2 and its discharge port. The first pump front flushing valve 701 on the first pump front flushing pipe 7 is opened to flush the first evaporator discharge pipe 9, the first heavy-component transfer pipe 10, and the connections before and after the first transfer pump 12, and the flushing water is discharged from the first flushing and discharging pipe 11. The first evaporator flushing valve 2401 on the first evaporator flushing pipe 24 is opened, the first evaporator discharge valve 901 is closed, water is filled into the first thin-film evaporator 2, and then it is heated and boiled for washing, and finally discharged from the first flushing and discharging pipe 11. Finally, the first thin-film evaporator 2, the first evaporator discharge pipe 9, the first transfer pump 12, the first heavy-component transfer pipe 10, and the first flushing and discharging pipe 11 are purged and cooled using the purging gas from the first flushing and purging pipe 5 to complete the cleaning process.
Claims
1. A tower bottom thin film evaporator switching cleaning system, characterized in that: The invention comprises a refining tower (1), wherein two sets of thin film evaporators are arranged at the bottom of the refining tower (1), the refining tower (1) is connected to the thin film evaporator via a bottom discharge pipe, the top of the thin film evaporator is connected to the bottom of the refining tower (1) via a bottom reflux pipe, the bottom discharge pipe is provided with a bottom discharge valve and a bottom discharge blind plate, the bottom reflux pipe is provided with a bottom reflux valve and a bottom reflux blind plate, the bottom of the thin film evaporator is connected to a heavy component transport pipe via an evaporator discharge pipe and a transport pump, the evaporator discharge pipe and the heavy component transport pipe are provided with a cleaning pipeline system, and the evaporator discharge pipe is provided with an evaporator discharge valve.
2. The tower bottom thin film evaporator switching cleaning system according to claim 1, characterized in that: The cleaning pipeline system includes a flushing and purging pipe, which is divided into four pipes: an evaporator flushing pipe, an evaporator backwashing pipe, a pre-pump flushing pipe and a post-pump flushing pipe. The evaporator flushing pipe is connected to the top of the thin-film evaporator, the evaporator backwashing pipe is connected to the evaporator discharge pipe near the bottom of the thin-film evaporator, the pre-pump flushing pipe is connected to the evaporator discharge pipe near the transport pump, and the post-pump flushing pipe is connected to the heavy component transport pipe.
3. The tower bottom thin film evaporator switching cleaning system according to claim 2, characterized in that: The evaporator flushing pipe, the evaporator backwashing pipe, the front-pump flushing pipe and the rear-pump flushing pipe are provided with an evaporator flushing valve, an evaporator backwashing valve, a front-pump flushing valve and a rear-pump flushing valve.
4. The tower bottom thin film evaporator switching cleaning system according to claim 3, characterized in that: The evaporator discharge valve is located between the connection point of the evaporator backwash pipe and the pump front flushing pipe on the evaporator discharge pipe.
5. The tower bottom thin film evaporator switching cleaning system according to claim 4, characterized in that: The heavy component transport pipe is provided with a heavy component transport valve, and the connection between the post-pump flushing pipe and the heavy component transport pipe is located at the heavy component transport valve close to the transport pump end.
6. The tower bottom thin film evaporator switching cleaning system according to claim 5, characterized in that: A flushing and discharging pipe is provided on the heavy component transport pipe.