Online cleaning structure for blocked pipeline of scraper condenser

Abstract

The utility model discloses an on-line cleaning structure for a blocked pipeline of a scraper condenser, which comprises an ethanol liquid seal tank, a heat exchanger, the scraper condenser, a liquid supply pipeline and a return pipeline, and the outlet of the ethanol liquid seal tank, the inlet and outlet of the heat exchanger and the inlet of the scraper condenser are respectively provided with a first three-way valve with a switch valve. A bypass pipeline consistent with the liquid supply pipeline is further arranged between the outlet of the ethanol liquid seal tank and the inlet of the scraper condenser, and the liquid supply pipeline and the bypass pipeline are connected in series through first three-way valves to form a parallel structure; and the flow direction of ethanol from the ethanol liquid seal tank to the scraper condenser can be actively switched between the liquid supply pipeline and / or the bypass pipeline through the valve switches on the first three-way valves. The problems that when a conveying blocking pipeline of the scraper condenser is blocked, online treatment has large influence on production and is poor in effect can be solved, parking maintenance can be avoided, and large damage to online cleaning cannot be caused any more.

Description

Technical Field

[0001] The utility model relates to the technical field of a first pre-condensation flow spray device, in particular to an online cleaning structure for blocked pipelines of a scraper condenser. Background Art

[0002] At present, in my country's polyester production lines, more and more production tends to be large-scale continuous production lines with an output of more than 180,000 tons. Its characteristics are continuous production, large output, and production reduction will affect product quality, and huge losses will occur after suspension of production. Our polyester production line has only one set of the first pre-condensation flow spraying device for production, which is mainly composed of an ethanol liquid seal tank and an ethanol circulation pump placed on the first floor, a heat exchanger placed on the second floor, and a scraper condenser placed on a higher floor. It is a key equipment. Once it has problems, such as low spray flow and unsmoothness, it will have a greater impact on the pre-condensation vacuum pumping. If the first pre-condensation vacuum pumping capacity deteriorates, it will affect the entire production line, causing large fluctuations in the liquid level of the front and rear reactors and even stagnation of materials. If the maintenance time is long, the quality of the spun filament products and slices will be greatly affected. The product can only be downgraded, which will cause a loss of no less than hundreds of thousands of yuan. The pipeline that causes the blockage is mainly located in the section from the outlet of the ethanol liquid seal tank to the inlet of the scraper condenser. Once maintenance is required, the machine needs to be shut down and the pipeline needs to be disassembled to clear the inside, which makes the operation difficult and the maintenance cost high. Therefore, it is necessary to improve the pipeline of the existing equipment so that the circulation pipeline of a pre-condensation flow spray device can be quickly switched and the problem pipeline can be maintained without stopping the machine or stopping the machine for a short time when the internal effective pipe diameter is reduced. Summary of the invention

[0003] In order to solve one or some technical problems existing in the prior art, the purpose of this application is to provide an online cleaning structure for the blocked pipes of a scraper condenser, which can solve the problem that when the transport pipes of the scraper condenser are blocked, online treatment has a great impact on production and the effect is not good, and can avoid parking for maintenance and will no longer cause great losses to online cleaning.

[0004] In order to solve the above existing technical problems, the purpose of this application is achieved by adopting the following technical solutions:

[0005] A scraper condenser blocked pipeline online cleaning structure, comprising an ethanol liquid seal tank, a heat exchanger and a scraper condenser, a liquid supply pipeline is provided between the outlet of the ethanol liquid seal tank and the inlet of the scraper condenser, a reflux pipeline is provided between the outlet of the scraper condenser and the inlet of the ethanol liquid seal tank, the liquid supply pipeline comprises a circulation pump provided between the ethanol liquid seal tank and the heat exchanger, a first delivery pipe, a second delivery pipe and a third delivery pipe provided in sequence between the ethanol liquid seal tank, the circulation pump, the heat exchanger and the scraper condenser, the outlet of the ethanol liquid seal tank A first three-way valve with a switch valve is provided at the inlet and outlet of the heat exchanger and the inlet of the scraper condenser. A bypass pipeline consistent with the liquid supply pipeline is also provided between the outlet of the ethanol liquid seal tank and the inlet of the scraper condenser. The liquid supply pipeline and the bypass pipeline are connected in series through each of the first three-way valves to form a parallel structure. The flow direction of ethanol from the ethanol liquid seal tank to the scraper condenser can be actively switched by the valve switch on each of the first three-way valves to switch the liquid supply pipeline and / or the bypass pipeline.

[0006] Preferably, the liquid outlet ends of the two third delivery pipes are each provided with a second three-way valve with a switch valve, and one of the pipe openings with a valve of the second three-way valve is an external water channel interface.

[0007] Preferably, the liquid inlet ends of the two third delivery pipes are each provided with a third three-way valve with a switch valve, one of the pipe openings with a valve of the third three-way valve is a drain outlet, and the waste water after cleaning and unblocking of the second three-way valve is discharged outward through the drain outlet of the third three-way valve.

[0008] Preferably, each of the two second delivery pipes is provided with a fourth three-way valve with a switch valve, and the second delivery pipes are cleaned and unblocked through the fourth three-way valve.

[0009] Preferably, the fourth three-way valve is arranged at the liquid outlet end of the circulation pump, and a series pipe is provided between the drain outlet of the third three-way valve and the second delivery pipe. The liquid injected into the second three-way valve passes through the series pipe to bypass the heat exchanger and is directly injected into the second delivery pipe for cleaning and discharged outwardly through the fourth three-way valve.

[0010] Preferably, the two external ports of the fourth three-way valves are connected to a waste liquid recovery tank through pipelines, and the sewage after cleaning the second delivery pipe and the third delivery pipe is uniformly collected and post-processed through the waste liquid recovery tank.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] On the basis of the original liquid supply pipeline between the ethanol liquid seal tank, the circulation pump, the heat exchanger and the scraper condenser, a bypass pipeline is added through several first three-way valves. The improvement of the first pre-condensation flow spray device is small, and it can be added during the shutdown maintenance, and the increase cost is low. Through the valve switch adjustment on the inlet and outlet of each first three-way valve, the flow direction of the ethanol flowing out of the ethanol liquid seal tank can be actively controlled, so that the ethanol can flow through the liquid supply pipeline or the bypass pipeline alone, thereby achieving the purpose of online processing of the blocked first pre-condensation spray pipeline without affecting normal production, completely avoiding the production accidents caused by the poor vacuum pumping capacity caused by the insufficient first pre-condensation spray volume, and avoiding the impact on production when the flow of the first pre-condensation spray pipeline system is insufficient. The problem of blockage of the first pre-condensation flow pipe can also be included in the scope of periodic operation, so that the first pre-condensation spray volume is effectively guaranteed. It effectively solves the problem that online processing has a large impact on production and poor effect, avoids parking for maintenance and no longer causes large losses to online cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] In the figure: 1. scraper condenser; 2. reflux pipeline; 3. ethanol liquid seal tank; 4. fourth three-way valve; 5. first delivery pipe; 6. first three-way valve; 7. waste liquid recovery tank; 8. second delivery pipe; 9. circulation pump; 10. heat exchanger; 11. third three-way valve; 12. drain outlet; 13. series pipe; 14. bypass pipeline; 15. liquid supply pipeline; 16. third delivery pipe; 17. second three-way valve; 18. external water channel interface. DETAILED DESCRIPTION

[0015] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0016] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0017] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0018] like Figure 1 As shown, an online cleaning structure for a blocked pipeline of a scraper condenser comprises an ethanol liquid seal tank 3, a heat exchanger 10 and a scraper condenser 1, a liquid supply pipeline 15 is provided between the outlet of the ethanol liquid seal tank 3 and the inlet of the scraper condenser 1, a reflux pipeline 2 is provided between the outlet of the scraper condenser 1 and the inlet of the ethanol liquid seal tank 3, the liquid supply pipeline 15 comprises a circulation pump 9 provided between the ethanol liquid seal tank 3 and the heat exchanger 10, a first delivery pipe 5, a second delivery pipe 8 and a third delivery pipe 16 provided in sequence between the ethanol liquid seal tank 3, the circulation pump 9, the heat exchanger 10 and the scraper condenser 1, characterized in that: the ethanol A first three-way valve 6 with a switch valve is provided at the outlet of the liquid seal tank 3, the inlet and outlet of the heat exchanger 10, and the inlet of the scraper condenser 1. A bypass pipeline 14 consistent with the liquid supply pipeline 15 is also provided between the outlet of the ethanol liquid seal tank 3 and the inlet of the scraper condenser 1. The liquid supply pipeline 15 and the bypass pipeline 14 are connected in series through each of the first three-way valves 6 to form a parallel structure. The flow direction of ethanol from the ethanol liquid seal tank 3 to the scraper condenser 1 can be actively switched by the valve switch on each of the first three-way valves 6 to switch the liquid supply pipeline 15 and / or the bypass pipeline 14.

[0019] On the basis of the original liquid supply pipeline 15 between the ethanol liquid seal tank 3, the circulation pump 9, the heat exchanger 10 and the scraper condenser 1, a bypass pipeline 14 is added through a plurality of first three-way valves 6, and the first pre-condensation flow spray device is slightly improved, and can be added during the shutdown maintenance period, and the increase cost is low. Through the valve switch adjustment on the inlet and outlet of each first three-way valve 6, the flow direction of the ethanol flowing out of the ethanol liquid seal tank 3 can be actively controlled, so that the ethanol can flow through the liquid supply pipeline 15 or the bypass pipeline 14 separately. When one of the flowing condensation pipelines has serious internal scaling, insufficient flow and other problems after long-term use, when it is blocked, it can be switched, and after opening the other pipeline, the ethanol can be discharged in the other pipeline. Flow, and by switching, the flow direction of ethanol can be switched without interruption. Since the blocked pipeline no longer flows ethanol, it can be easily cleaned. When cleaning the pipeline, qualified units can have enough time and conditions to handle it, thereby achieving the purpose of online treatment of the blocked first pre-condensation spray pipeline without affecting normal production, completely avoiding production accidents caused by poor vacuum pumping capacity due to insufficient first pre-condensation spray volume or shutdown for maintenance, avoiding the impact of insufficient flow on production when dealing with the first pre-condensation spray pipeline system, and can also include the problem of blockage of the first pre-condensation flow tube into the scope of periodic regular operations, so that the first pre-condensation spray volume can be effectively guaranteed. It effectively solves the problem that online treatment has a large impact on production and poor results, avoids shutdown for maintenance, and does not cause major losses to online cleaning.

[0020] As a further improvement, each of the two third delivery pipes 16 has a second three-way valve 17 with a switch valve at its liquid outlet, and one of the valved pipe openings of the second three-way valve 17 is an external water channel interface 18 .

[0021] Although the liquid supply pipeline 15 and the bypass pipeline 14 can be normally inspected and maintained without stopping the machine, the existing pipelines are generally cleaned by drilling, injecting liquid, knocking, etc. In order to facilitate qualified maintenance personnel to reduce damage and disassembly of the pipelines during cleaning, a second three-way valve 17 with a switch valve is installed at the liquid outlet end of the two third delivery pipes 16. Under normal circumstances, the valve of the external water channel interface 18 with a valve is in a closed state. When cleaning is required, the valve is opened after connecting to an external water source, and water can be directly injected into the third delivery pipe 16 for cleaning, making the water inlet of the third delivery pipe 16 more convenient. In addition, the second three-way valve 17 is installed at the liquid outlet end of the third delivery pipe 16, which is located at the highest point of the entire delivery pipeline, which can make the cleaning water channel flow more smoothly, so that the waste liquid after cleaning can be discharged from the bottom in time, and the liquid discharge is more thorough.

[0022] A further improvement is that the liquid inlet ends of the two third delivery pipes 16 are each provided with a third three-way valve 11 with a switch valve, one of the pipe openings with a valve of the third three-way valve 11 is a drain outlet 12, and the waste water after cleaning and dredging by the second three-way valve 17 is discharged outward through the drain outlet 12 of the third three-way valve 11.

[0023] After a third three-way valve 11 with a switch valve is installed at the liquid inlet end of each of the two third delivery pipes 16, the waste liquid after cleaning can be discharged directly from one of the drain ports 12 with a valve of the third three-way valve 11, avoiding breaking or disassembling the feed end of the third delivery pipe 16, thereby achieving rapid cleaning and discharge.

[0024] As a further improvement, each of the two second delivery pipes 8 is provided with a fourth three-way valve 4 with a switch valve, and the second delivery pipe 8 is cleaned and unblocked through the fourth three-way valve 4 .

[0025] When cleaning the second delivery pipe 8 , water can be injected through the fourth three-way valve 4 for cleaning and dredging, or the fourth three-way valve 4 can be used as the drain port 12 for water discharge, which is more convenient when cleaning the second delivery pipe 8 .

[0026] At the same time, in order to facilitate the one-time cleaning of the second delivery pipe 8 and the third delivery pipe 16, the fourth three-way valve 4 is arranged at the liquid outlet end of the circulation pump 9, and a series pipe 13 is arranged between the drain port 12 of the third three-way valve 11 and the second delivery pipe 8. The liquid injected into the second three-way valve 17 passes through the series pipe 13 to bypass the heat exchanger 10 and is directly injected into the second delivery pipe 8 for cleaning and is discharged outwardly through the fourth three-way valve 4.

[0027] When the second three-way valve 17 is injected with cleaning liquid for cleaning, the liquid can directly enter the second delivery pipe 8 from the drain port 12 of the third three-way valve 11 through the series pipe 13, and then be discharged to the outside through the fourth three-way valve 4, effectively solving the problem of needing to disassemble or break the pipe wall when cleaning.

[0028] As a further improvement, the two external ports of the fourth three-way valves 4 are connected to a waste liquid recovery tank 7 through pipelines, and the sewage cleaned by the second delivery pipe 8 and the third delivery pipe 16 is uniformly collected through the waste liquid recovery tank 7 and post-processed.

[0029] In order to facilitate the unified treatment of the waste liquid after cleaning, the external ports of the two fourth three-way valves 4 are connected to the waste liquid recovery tank 7 through pipelines. When the waste liquid flows out after cleaning, it can be directly counted into the waste liquid recovery tank 7, and then flow into the wastewater treatment system through the waste liquid recovery tank 7 for treatment. After careful research and practical work in production, it is found that after adopting the above technical solution, without affecting normal production, the problem of severe scaling and insufficient flow in the first pre-condensation pipeline can be solved by combining multiple methods such as dismantling, knocking, high-temperature ethylene glycol flushing, steam flushing, etc., to dredge the blocked pipeline, and then switch to dredge another one. Without affecting normal production, the problem that the pipeline cannot be cleaned online can be effectively solved, and the production accident caused by poor vacuuming ability due to insufficient spray volume of the first pre-condensation pipeline is completely avoided.

[0030] The above-mentioned implementation modes are only preferred implementation modes of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present application shall fall within the scope of protection required by the present application.

Claims

1. An online cleaning structure for a scraper condenser blocked pipeline, comprising an ethanol liquid sealing tank (3), a heat exchanger (10) and a scraper condenser (1), a liquid supply pipeline (15) being provided between the outlet of the ethanol liquid sealing tank (3) and the inlet of the scraper condenser (1), a reflux pipeline (2) being provided between the outlet of the scraper condenser (1) and the inlet of the ethanol liquid sealing tank (3), the liquid supply pipeline (15) comprising a circulation pump (9) provided between the ethanol liquid sealing tank and the heat exchanger (10), a first delivery pipe (5), a second delivery pipe (8) and a third delivery pipe (16) being provided in sequence between the ethanol liquid sealing tank (3), the circulation pump (9), the heat exchanger (10) and the scraper condenser (1), characterized in that: A first three-way valve (6) with a switch valve is provided at the outlet of the ethanol liquid seal tank (3), the inlet and outlet of the heat exchanger (10) and the inlet of the scraper condenser (1). A bypass pipeline (14) consistent with the liquid supply pipeline (15) is also provided between the outlet of the ethanol liquid seal tank (3) and the inlet of the scraper condenser (1). The liquid supply pipeline (15) and the bypass pipeline (14) are connected in series through each of the first three-way valves (6) to form a parallel structure. The flow direction of ethanol between the ethanol liquid seal tank (3) and the scraper condenser (1) can be actively switched by the valve switch on each of the first three-way valves (6) to switch the liquid supply pipeline (15) and / or the bypass pipeline (14).

2. The online cleaning structure for blocked pipes of a scraper condenser according to claim 1, characterized in that: The liquid outlet ends of the two third delivery pipes (16) are each provided with a second three-way valve (17) with a switch valve, and one of the pipe openings with a valve of the second three-way valve (17) is an external water channel interface (18).

3. The online cleaning structure for blocked pipes of a scraper condenser according to claim 2, characterized in that: A third three-way valve (11) with a switch valve is provided at the liquid inlet end of each of the two third delivery pipes (16); one of the pipe openings with a valve of the third three-way valve (11) is a drain outlet (12); and waste water after cleaning and dredging by the second three-way valve (17) is discharged to the outside through the drain outlet (12) of the third three-way valve (11).

4. The online cleaning structure for blocked pipes of a scraper condenser according to claim 3 is characterized by: A fourth three-way valve (4) with a switch valve is provided on each of the two second delivery pipes (8), and the second delivery pipes (8) are cleaned and unblocked through the fourth three-way valve (4).

5. The online cleaning structure for blocked pipes of a scraper condenser according to claim 4, characterized in that: The fourth three-way valve (4) is arranged at the liquid outlet end of the circulation pump (9), and a series pipe (13) is arranged between the drain port (12) of the third three-way valve (11) and the second delivery pipe (8). The liquid injected into the second three-way valve (17) passes through the series pipe (13) and bypasses the heat exchanger (10) before being directly injected into the second delivery pipe (8) for cleaning and discharged outwardly through the fourth three-way valve (4).

6. The online cleaning structure for blocked pipes of a scraper condenser according to claim 5, characterized in that: The external ports of the two fourth three-way valves (4) are both connected to a waste liquid recovery tank (7) through pipelines, and the sewage after cleaning the second delivery pipe (8) and the third delivery pipe (16) is uniformly collected and post-processed through the waste liquid recovery tank (7).

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