Feeding filter of NMP rectifying tower

Abstract

The utility model provides an NMP rectifying tower feed filter which comprises a three-way pipe, a filter screen, a feed pipe and a backflushing mechanism, three pipe orifices of the three-way pipe are respectively a feed port, a discharge port and a drain outlet, the feed pipe is connected with the feed port of the three-way pipe, the filter screen is installed in the three-way pipe and located at the communication position of pipelines where the feed port and the drain outlet are located, and the backflushing mechanism is installed on the filter screen. The backflushing mechanism is connected with a sewage draining exit of the three-way pipe; nMP raw materials enter the three-way pipe through the feeding pipe and are discharged outwards through the discharging port of the three-way pipe, the filter screen in the three-way pipe is used for filtering out a small amount of solid particles in feed liquid, and when the solid particles on the filter screen are too many and influence conveying of the NMP raw materials, the high-purity NMP raw materials are reversely blown from the discharging port of the three-way pipe to the feeding port through the backflushing mechanism; according to the filter screen cleaning device, the filter screen is arranged, solid particles adhered to the filter screen fall down and fall into the sewage draining exit, cleaning of the filter screen is achieved, the filter screen can be cleaned through the arranged back flushing mechanism, and the service life of the filter screen cleaning device is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of distillation tower feed filtration, in particular to an NMP distillation tower feed filter. Background Art

[0002] Before the NMP raw material enters the distillation tower, a small amount of solid particles in the liquid will affect the normal operation of the compressor, pump, instrument and other equipment. Therefore, it is necessary to filter the NMP raw material before entering the distillation tower. The conventional method is to install a filter inside the pipeline that transports the NMP raw material to filter the small amount of solid particles in the NMP raw material through the filter. Since alkali solution is added to the NMP raw material, it is easy to scale. Excessive scaling increases the pressure in the pipe, and the NMP raw material breaks through the filter or leaks easily, which reduces the service life of the pump and increases the maintenance cost. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In order to solve the above problems in the prior art, the utility model provides a NMP distillation tower feed filter.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0007] An NMP distillation tower feed filter comprises a tee pipe, a filter screen, a feed pipe and a recoil mechanism;

[0008] The three pipe openings of the three-way pipe are respectively a feed port, a discharge port and a sewage outlet;

[0009] The feed pipe is connected to the feed port of the tee pipe;

[0010] The filter screen is installed inside the three-way pipe and is located at the connecting part of the pipeline where the feed inlet and the sewage outlet are located;

[0011] The recoil mechanism is connected to the sewage outlet of the three-way pipe.

[0012] Preferably, the recoil mechanism includes a discharge pipe, a booster pump and a connecting pipe, the discharge pipe is connected to the sewage outlet of the three-way pipe, the input port of the booster pump is connected to the NMP storage tank through a pipeline, and the output port of the booster pump is connected to the discharge pipe through the connecting pipe.

[0013] Preferably, it further comprises a control mechanism, wherein the control mechanism comprises a processor, a hydraulic sensor and a control valve;

[0014] The hydraulic sensor is installed on the pipeline where the feed port is located;

[0015] The control valve is installed on the feed pipe;

[0016] The hydraulic pressure sensor, the control valve and the recoil mechanism are all electrically connected to the processor.

[0017] Preferably, a sewage valve is provided at the sewage outlet of the three-way pipe.

[0018] Preferably, the filter screen is a PE filter screen.

[0019] (III) Beneficial effects

[0020] The beneficial effects of the utility model are:

[0021] 1. The NMP raw material enters the tee through the feed pipe and is discharged outward through the discharge port of the tee. The filter screen in the tee is used to filter out a small amount of solid particles in the feed liquid. When there are too many solid particles on the filter screen, which affects the transportation of the NMP raw material, the high-purity NMP raw material is backflushed from the discharge port of the tee toward the feed port through the recoil mechanism, and the solid particles adhering to the filter screen are dropped and fall into the sewage outlet to clean the filter screen. The recoil mechanism provided in the present application can clean the filter screen and extend the service life of the present application.

[0022] 2. The hydraulic pressure of the NMP raw material in the three-way pipe before passing through the filter is determined by the hydraulic sensor. When the hydraulic pressure value exceeds the threshold, it means that the filter is blocked. The processor drives the control valve to close, and then drives the recoil mechanism to start, realizing automatic recoil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a feed filter for an NMP distillation tower;

[0024] Figure 2 The figure is a circuit connection diagram of a feed filter for an NMP distillation tower.

[0025] Description of reference numerals:

[0026] 1. Tee pipe;

[0027] 11. Feed inlet; 12. Discharge outlet; 13. Sewage outlet;

[0028] 2. Feed pipe;

[0029] 3. Control valve;

[0030] 4. Drain valve;

[0031] 5. Recoil mechanism;

[0032] 51. Discharge pipe; 52. Connecting pipe; 53. Booster pump;

[0033] 6. Filter;

[0034] 7. Hydraulic sensor. DETAILED DESCRIPTION

[0035] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0036] Please refer to Figure 1 to Figure 2 The utility model provides a feed filter for an NMP distillation tower, comprising a three-way pipe 1, a filter screen 6, a feed pipe 2 and a recoil mechanism 5;

[0037] The three pipe openings of the tee pipe 1 are respectively a feed opening 11, a discharge opening 12 and a sewage outlet 13;

[0038] The feed pipe 2 is connected to the feed port 11 of the tee pipe 1;

[0039] The filter screen 6 is installed inside the three-way pipe 1 and is located at the connecting part of the pipe where the feed inlet 11 and the sewage outlet 13 are located;

[0040] The recoil mechanism 5 is connected to the sewage outlet 13 of the three-way pipe 1;

[0041] When in use, the NMP raw material enters the tee 1 through the feed pipe 2 and is discharged outward through the discharge port 12 of the tee 1. The filter screen 6 in the tee 1 is used to filter out a small amount of solid particles in the feed liquid. When there are too many solid particles on the filter screen 6, which affects the transportation of the NMP raw material, the high-purity NMP raw material is backflushed from the discharge port 12 of the tee 1 toward the feed port 11 through the recoil mechanism 5, and the solid particles adhered to the filter screen 6 are dropped and dropped into the sewage outlet 13, thereby cleaning the filter screen 6. The recoil mechanism 5 provided in the present application can clean the filter screen 6, thereby extending the service life of the present application.

[0042] In this embodiment, the recoil mechanism 5 includes a discharge pipe 51, a booster pump 53 and a connecting pipe 52. The discharge pipe 51 is connected to the sewage outlet 13 of the three-way pipe 1, the input port of the booster pump 53 is connected to the NMP storage tank through a pipeline, and the output port of the booster pump 53 is connected to the discharge pipe 51 through the connecting pipe 52;

[0043] The high-purity NMP raw material is transported to the discharge pipe 51 by the booster pump 53 , and is back-blown from the discharge port 12 of the tee pipe 1 toward the feed port 11 to clean the filter screen 6 .

[0044] In this embodiment, a control mechanism is also included, and the control mechanism includes a processor, a hydraulic sensor 7 and a control valve 3;

[0045] The hydraulic sensor 7 is installed on the pipeline where the feed port 11 is located;

[0046] The control valve 3 is installed on the feed pipe 2;

[0047] The hydraulic sensor 7, the control valve 3 and the recoil mechanism 5 are all electrically connected to the processor;

[0048] When in use, the hydraulic pressure of the NMP raw material in the three-way pipe 1 before passing through the filter 6 is determined by the hydraulic sensor 7. When the hydraulic pressure value exceeds the threshold, it means that the filter 6 is blocked. The processor drives the control valve 3 to close, and then drives the recoil mechanism 5 to start, thereby realizing automatic recoil.

[0049] In this embodiment, a drain valve 4 is provided at the drain outlet 13 of the three-way pipe 1 , and solid particles adhered to the filter screen 6 fall into the drain outlet 13 of the three-way pipe 1 , and the drain is discharged by opening the drain valve 4 .

[0050] In this embodiment, the filter screen 6 is a PE filter screen 6 .

[0051] The working principle of the utility model is as follows:

[0052] 1. The NMP raw material enters the tee pipe 1 through the feed pipe 2 and is discharged outward through the discharge port 12 of the tee pipe 1. The filter screen 6 in the tee pipe 1 is used to filter out a small amount of solid particles in the feed liquid. When there are too many solid particles on the filter screen 6, which affects the transportation of the NMP raw material, the high-purity NMP raw material is backflushed from the discharge port 12 of the tee pipe 1 toward the feed port 11 through the recoil mechanism 5, and the solid particles adhered to the filter screen 6 are dropped and dropped into the sewage outlet 13, thereby cleaning the filter screen 6. The recoil mechanism 5 provided in the present application can clean the filter screen 6, thereby extending the service life of the present application.

[0053] 2. The hydraulic pressure of the NMP raw material in the three-way pipe 1 before passing through the filter 6 is determined by the hydraulic sensor 7. When the hydraulic pressure value exceeds the threshold value, it means that the filter 6 is blocked. The processor drives the control valve 3 to close, and then drives the recoil mechanism 5 to start, so as to realize automatic recoil.

[0054] The circuits, electronic components and modules involved are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by this utility model does not involve improvements to software and methods.

[0055] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A NMP distillation tower feed filter, characterized in that, It includes a three-way pipe, a filter screen, a feed pipe and a recoil mechanism; The three pipe openings of the three-way pipe are respectively a feed port, a discharge port and a sewage outlet; The feed pipe is connected to the feed port of the tee pipe; The filter screen is installed inside the three-way pipe and is located at the connecting part of the pipeline where the feed inlet and the sewage outlet are located; The recoil mechanism is connected to the sewage outlet of the three-way pipe.

2. A NMP distillation tower feed filter according to claim 1, characterized in that, The recoil mechanism includes a discharge pipe, a booster pump and a connecting pipe, the discharge pipe is connected to the sewage outlet of the three-way pipe, the input port of the booster pump is connected to the NMP storage tank through a pipeline, and the output port of the booster pump is connected to the discharge pipe through the connecting pipe.

3. A NMP distillation tower feed filter according to claim 1, characterized in that, Also included is a control mechanism, the control mechanism including a processor, a hydraulic pressure sensor, and a control valve; The hydraulic sensor is installed on the pipeline where the feed port is located; The control valve is installed on the feed pipe; The hydraulic pressure sensor, the control valve and the recoil mechanism are all electrically connected to the processor.

4. A NMP distillation tower feed filter according to claim 1, characterized in that, A sewage valve is arranged at the sewage outlet of the three-way pipe.

5. A NMP distillation tower feed filter according to claim 1, characterized in that, The filter net is a PE filter net.

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