Cleaning device of caprolactam monomer recovery discharging pipeline and control system thereof

Abstract

The utility model belongs to the technical field of caprolactam monomer recovery devices, and particularly relates to a cleaning device of a caprolactam monomer recovery discharging pipeline and a control system of the cleaning device. The cleaning device comprises a discharging tank and a receiving tank which are connected through a discharging pipeline, and further comprises a steam pulse pipeline connected to the discharging pipeline, the steam pulse pipeline comprises a steam pipeline section and a pulse blowing section, and a steam filtering structure and a steam electromagnetic valve are arranged on the pulse blowing section. The steam electromagnetic valve and a discharging pipeline pneumatic valve on the discharging pipeline are in opening degree linkage, when the discharging pipeline pneumatic valve reaches a certain opening degree, the steam electromagnetic valve is opened, and filtered steam starts to automatically purge the discharging pipeline. According to the utility model, the high-pressure steam pipeline is additionally arranged on the discharge pipeline, so that when the pipeline is unsmooth and low polymer precipitation blockage occurs, the discharge can be stopped, the high-pressure steam is started to blow the discharge pipeline, and the blockage can be cleaned in time, thereby avoiding the expansion of the low polymer precipitation blockage problem and ensuring the normal operation of production.

Description

Technical Field

[0001] This utility model belongs to the technical field of caprolactam monomer recovery devices, and particularly relates to a cleaning device and control system for a caprolactam monomer recovery discharge pipeline. Background Technology

[0002] During the caprolactam monomer recovery process, the discharge pipe is prone to blockage after long-term use due to the presence of oligomers. These oligomers are mainly cyclic dimers and cyclic trimers, which readily crystallize and precipitate under certain conditions, thus clogging the pipes. Once blockage occurs, normal production will be affected, requiring shutdown for repairs and increasing maintenance costs.

[0003] Current technologies typically employ manual methods to periodically clean discharge pipes, but this method poses certain safety hazards and is inefficient. Alternatively, chemical flushing methods are used, but these generate new environmental pollution problems. Furthermore, current technologies cannot promptly clean caprolactam monomer recovery discharge pipes, failing to prevent the expansion of oligomer precipitation and blockage, thus affecting normal production operations. Existing technologies cannot promptly determine if the pipe is blocked when the discharge valve opening increases, and cannot take timely measures to clear blockages. Specifically, existing technologies have the following drawbacks:

[0004] 1. Existing technology cannot effectively prevent the problem of oligomer precipitation and blockage in caprolactam monomer recovery and discharge pipelines after long-term use. Once blockage occurs, it will affect normal production, requiring shutdown for treatment and increasing maintenance costs.

[0005] 2. The existing technology of manually cleaning the discharge pipes regularly poses certain safety hazards and is inefficient.

[0006] 3. Existing technologies that use chemical agents to flush discharge pipes will create new environmental pollution problems.

[0007] 4. Existing technology cannot clean the caprolactam monomer recovery and discharge pipeline in a timely manner, and cannot prevent the oligomer precipitation and blockage problem from expanding, affecting the normal operation of production.

[0008] 5. Existing technology cannot promptly determine whether the pipeline is blocked when the discharge valve opening increases, and cannot take timely measures to clear the blockage.

[0009] Therefore, a safe and efficient method is urgently needed to clean the caprolactam monomer recovery and discharge pipeline in a timely manner, so as to avoid the expansion of oligomer precipitation and blockage and ensure the normal operation of production. Utility Model Content

[0010] In order to solve the problems existing in the prior art, this utility model provides a cleaning device and control system for a caprolactam monomer recovery and discharge pipeline.

[0011] The technical solution adopted by this utility model to solve this problem is:

[0012] A cleaning device for a caprolactam monomer recovery discharge pipeline includes a discharge tank and a receiving tank connected through the discharge pipeline. The device is characterized by further including a steam pulse pipeline connected to the discharge pipeline. The steam pulse pipeline includes a steam pipeline section and a pulse purging section. The pulse purging section is equipped with a steam filter structure and a steam solenoid valve. The steam solenoid valve is interlocked with a discharge pipeline pneumatic valve on the discharge pipeline. When the discharge pipeline pneumatic valve reaches a certain opening degree, the steam solenoid valve opens, and the filtered steam begins to automatically purge the discharge pipeline.

[0013] In the above technical solution, one end of the pulse purging section is connected to the steam pipeline section through a connecting flange, and the other end is connected to the steam pipeline interface of the discharge pipeline through a welding valve.

[0014] In the above technical solution, the steam pipeline section is a high-pressure steam pipeline.

[0015] In the above technical solution, a discharge solenoid valve is installed on the discharge pipe between the discharge tank and the pulse purging section, and a discharge pipe pneumatic valve is installed on the discharge pipe between the pulse purging section and the receiving tank.

[0016] In the above technical solution, the central axis of the output section of the pulse purging section is on the same straight line as the central axis of the discharge pipe between the pulse purging section and the receiving tank.

[0017] In the above technical solution, the steam filtration structure includes a coarse steam filter and a fine steam filter arranged sequentially along the steam flow direction within the pulse purging section.

[0018] In the above technical solution, the steam coarse filter and the steam fine filter are one of the mesh filter and the media filter, and the filtration accuracy of the steam coarse filter is lower than that of the steam fine filter.

[0019] In the above technical solution, a steam pressure regulating valve is also provided on the pulse purging section.

[0020] In the above technical solution, the discharge tank and the receiving tank are respectively equipped with liquid level detection structures, and the discharge pipe is also equipped with a flow detection structure.

[0021] The second objective of this invention is to provide a control system for a cleaning device of a caprolactam monomer recovery and discharge pipeline, comprising:

[0022] A steam solenoid valve installed on a steam pulse pipeline;

[0023] The discharge solenoid valve, flow meter, and discharge pneumatic valve are installed on the discharge pipeline;

[0024] A discharge tank level gauge installed on the discharge tank;

[0025] A level gauge for the receiving tank installed on the receiving tank;

[0026] The control system is electrically connected to the steam solenoid valve, discharge solenoid valve, flow meter, opening sensor, discharge pipeline pneumatic valve, discharge tank level gauge, and receiving tank level gauge.

[0027] In the above technical solution, the pneumatic valve of the discharge pipeline is interlocked with one or more of the following: steam solenoid valve, flow meter, opening sensor, discharge tank level gauge, and receiving tank level gauge.

[0028] The advantages and positive effects of this utility model are:

[0029] 1. This utility model adds a high-pressure steam pipe to the discharge pipe. When the opening of the pneumatic valve in the discharge pipe is found to be increased, it indicates that the pipe is not smooth and that oligomer precipitation and blockage have occurred. At this time, the discharge can be stopped, and the high-pressure steam can be turned on to purge the discharge pipe, clear the blockage in time, prevent the oligomer precipitation and blockage problem from expanding, and ensure the normal operation of production.

[0030] 2. This utility model is simple to operate, requires no manual intervention, avoids the safety hazards of manual cleaning, and improves cleaning efficiency.

[0031] 3. This utility model utilizes high-pressure steam cleaning, eliminating the need for chemical agents and avoiding the environmental pollution problems caused by chemical agents.

[0032] 4. This utility model determines whether the discharge pipe is blocked by monitoring the change in the opening degree of the pneumatic valve, thus realizing real-time monitoring of the blockage of the discharge pipe. Once a blockage occurs, measures can be taken in time to prevent the problem from escalating.

[0033] 5. This utility model has low cleaning costs, requiring only the addition of a high-pressure steam pipeline without the need to replace other equipment, thus exhibiting good economic efficiency. Attached Figure Description

[0034] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this utility model. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0035] Figure 1This is a schematic diagram of the cleaning device for the caprolactam monomer recovery and discharge pipeline in this utility model;

[0036] Figure 2 This is a flowchart of the cleaning method for the caprolactam monomer recovery and discharge pipeline in this utility model.

[0037] In the diagram: 1-Steam pressure regulating valve; 2-Steam coarse filter; 3-Steam fine filter; 4-Connecting flange; 5-Steam pipeline section; 6-Discharge pipeline; 7-Filter screen; 8-Steam solenoid valve; 9-Welding valve; 10-Discharge pipeline pneumatic valve; 11-Discharge tank; 12-Receiving tank. Detailed Implementation

[0038] First, it should be noted that the specific structure, features, and advantages of this utility model will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the utility model in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of this utility model that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The utility model will now be described in detail with reference to the accompanying drawings. Example 1

[0040] A cleaning device for a caprolactam monomer recovery discharge pipeline includes a discharge tank 11 and a receiving tank 12 connected by a discharge pipeline 6. It also includes a steam pulse pipeline connected to the discharge pipeline 6. The steam pulse pipeline includes a steam pipeline section 5 and a pulse purging section. The pulse purging section is equipped with a steam filter structure and a steam solenoid valve 8. The steam solenoid valve 8 is interlocked with the discharge pipeline pneumatic valve (discharge valve) 10 on the discharge pipeline 6. When the discharge pipeline pneumatic valve 10 reaches a certain opening degree, the steam solenoid valve 8 opens, and the filtered steam begins to automatically purge the discharge pipeline 6.

[0041] In this embodiment, a high-pressure steam pipe is added to the discharge pipe to achieve the function of cleaning the pipe and preventing pipe blockage. This solves the problem of not being able to clean up the oligomers in the pipe in a timely manner. When the discharge valve opening is found to be increased, it indicates that the pipe is not smooth and that oligomers have precipitated and blocked it. At this time, the discharge can be stopped, and the high-pressure steam can be turned on to purge the discharge pipe, clear the blockage in time, and prevent the problem from escalating.

[0042] Furthermore, in this embodiment, one end of the pulse purging section is connected to the steam pipe section 5 via a connecting flange 4, and the other end is connected to the steam pipe interface of the discharge pipe 6 via a welding valve 9.

[0043] Furthermore, in this embodiment, the steam pipe section 5 can also be considered as a high-pressure steam pipe.

[0044] Furthermore, in this embodiment, a discharge solenoid valve may be provided on the discharge pipe 6 between the discharge tank 11 and the pulse purging section, and a discharge pipe pneumatic valve 10 may be provided on the discharge pipe 6 between the pulse purging section and the receiving tank 12.

[0045] Furthermore, in this embodiment, the central axis of the output section of the pulse purging section is on the same straight line as the central axis of the discharge pipe 6 between the pulse purging section and the receiving tank 12.

[0046] Furthermore, in this embodiment, the steam filtration structure may include a coarse steam filter 2 and a fine steam filter 3 arranged sequentially along the steam flow direction within the pulse purging section.

[0047] Furthermore, in this embodiment, the steam coarse filter 2 and the steam fine filter 3 can be either a mesh filter or a media filter, with the filtration accuracy of the steam coarse filter 2 being lower than that of the steam fine filter 3. The filters are responsible for intercepting impurities in the steam pipeline, ensuring that impurities do not enter the liquid. The steam coarse filter (2) is responsible for intercepting larger impurities mixed in the steam, extending the service life of the steam fine filter (3).

[0048] Taking this embodiment as an example, the filter is a mesh filter with densely packed filter holes. The steam that has undergone drainage treatment is filtered through two stages of coarse and fine filtration, and substances smaller than the pore size of the filter medium are intercepted by the filter medium.

[0049] Furthermore, in this embodiment, the filter can also be a mesh filter made of stainless steel, with the coarse filter having a lower filtration precision than the fine filter.

[0050] Furthermore, in this embodiment, a steam pressure regulating valve 1 can also be provided on the pulse purging section. By setting a program, the pressure regulating valve 1 can be remotely controlled to adjust the steam pressure slowly and gradually, avoiding drastic fluctuations in steam pressure that could affect the purging effect.

[0051] Furthermore, in this embodiment, the discharge tank 11 and the receiving tank 12 are respectively equipped with liquid level detection structures, and the discharge pipe 6 is also equipped with a flow detection structure. Example 2

[0052] A control system for a cleaning device for a caprolactam monomer recovery and discharge pipeline includes:

[0053] A steam solenoid valve installed on a steam pulse pipeline;

[0054] The discharge solenoid valve, flow meter, and discharge pneumatic valve are installed on the discharge pipeline;

[0055] An opening sensor is installed on the pneumatic valve or solenoid valve of the discharge pipeline;

[0056] A discharge tank level gauge installed on the discharge tank;

[0057] A level gauge for the receiving tank installed on the receiving tank;

[0058] The control system is electrically connected to the steam solenoid valve, discharge solenoid valve, flow meter, opening sensor, discharge pipeline pneumatic valve, discharge tank level gauge, and receiving tank level gauge.

[0059] Furthermore, in this embodiment, the pneumatic valve of the discharge pipeline can be interlocked with one or more of the following: a steam solenoid valve, a flow meter, an opening sensor, a discharge tank level gauge, and a receiving tank level gauge.

[0060] In this embodiment, a flow meter is installed on the discharge pipe, and the flow rate changes are used to determine whether the discharge pipe is blocked. The discharge valve can be interlocked with the flow meter on the discharge pipe.

[0061] By observing the changes in the liquid levels in the discharge tank and the receiving tank, it can be determined whether the discharge pipe outlet is blocked. The discharge valve can be interlocked with the liquid levels in the discharge tank and the receiving tank.

[0062] An opening sensor can be used to monitor changes in the opening of the discharge valve. When an increase in the opening of the discharge pipe outlet is detected, the steam solenoid valve and the pneumatic valve of the discharge pipe are interlocked. When the system detects that the pneumatic valve of the discharge pipe has reached a certain opening, the steam solenoid valve automatically opens, and the filtered steam begins to automatically purge the discharge pipe. Example 3

[0063] A method for cleaning a caprolactam monomer recovery and discharge pipeline includes:

[0064] Step 1: Add a high-pressure steam pipe to the discharge pipe of caprolactam monomer recovery;

[0065] Step 2: Monitor the opening change of the discharge valve;

[0066] Step 3: Determine if the discharge valve opening has increased. If yes, proceed to step 4; otherwise, continue monitoring.

[0067] Step 4: Stop discharging material and turn on high-pressure steam to purge the discharge pipe.

[0068] Step 1 includes:

[0069] Step 101: Reserve a high-pressure steam pipe interface on the discharge pipe;

[0070] Step 102: Connect the high-pressure steam pipe to the interface;

[0071] Step 103: Install control valves on the high-pressure steam pipeline.

[0072] Step 2 includes:

[0073] Step 201: Install an opening sensor on the discharge valve;

[0074] Step 202: Connect the opening sensor to the control system;

[0075] Step 203: The control system monitors the opening changes of the discharge valve in real time.

[0076] Step 4 includes:

[0077] Step 401: The control system issues a stop discharging command;

[0078] Step 402: The control system issues a command to open the high-pressure steam control valve;

[0079] Step 403: After the high-pressure steam purges the discharge pipeline for a period of time, the control system issues a command to close the high-pressure steam control valve;

[0080] Step 404: The control system issues a command to resume material discharge.

[0081] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A cleaning device for a caprolactam monomer recovery discharge pipeline, comprising a discharge tank and a receiving tank connected via the discharge pipeline, characterized in that: It also includes a steam pulse pipeline connected to the discharge pipeline. The steam pulse pipeline includes a steam pipeline section and a pulse purging section. The pulse purging section is equipped with a steam filter structure and a steam solenoid valve. The steam solenoid valve is interlocked with the discharge pipeline pneumatic valve on the discharge pipeline. When the discharge pipeline pneumatic valve reaches a certain opening degree, the steam solenoid valve opens, and the filtered steam begins to automatically purge the discharge pipeline.

2. The cleaning device for a caprolactam monomer recovery and discharge pipeline according to claim 1, characterized in that: One end of the pulse purging section is connected to the steam pipeline section via a connecting flange, and the other end is connected to the steam pipeline interface of the discharge pipeline via a welding valve.

3. The cleaning device for a caprolactam monomer recovery and discharge pipeline according to claim 1, characterized in that: A discharge solenoid valve is installed on the discharge pipe between the discharge tank and the pulse purging section, and a discharge pipe pneumatic valve is installed on the discharge pipe between the pulse purging section and the receiving tank.

4. The cleaning device for a caprolactam monomer recovery and discharge pipeline according to claim 1, characterized in that: The central axis of the output section of the pulse purging section is on the same straight line as the central axis of the discharge pipe between the pulse purging section and the receiving tank.

5. The cleaning device for a caprolactam monomer recovery and discharge pipeline according to claim 1, characterized in that: The steam filtration structure includes a coarse steam filter and a fine steam filter arranged sequentially along the steam flow direction within the pulse purging section.

6. The cleaning device for a caprolactam monomer recovery and discharge pipeline according to claim 5, characterized in that: The steam coarse filter and the steam fine filter are one type of mesh filter or media filter, and the filtration accuracy of the steam coarse filter is lower than that of the steam fine filter.

7. The cleaning device for a caprolactam monomer recovery and discharge pipeline according to claim 1, characterized in that: The pulse purging section is also equipped with a steam pressure regulating valve.

8. The cleaning device for a caprolactam monomer recovery and discharge pipeline according to claim 1, characterized in that: The discharge tank and receiving tank are respectively equipped with liquid level detection structures, and the discharge pipe is also equipped with a flow detection structure.

9. A control system for a cleaning device for a caprolactam monomer recovery and discharge pipeline as described in any one of claims 1-8, characterized in that: include: A steam solenoid valve installed on a steam pulse pipeline; The discharge solenoid valve, flow meter, and discharge pneumatic valve are installed on the discharge pipeline; A discharge tank level gauge installed on the discharge tank; A level gauge for the receiving tank installed on the receiving tank; The control system is electrically connected to the steam solenoid valve, discharge solenoid valve, flow meter, opening sensor, discharge pipeline pneumatic valve, discharge tank level gauge, and receiving tank level gauge.

10. The control system of the cleaning device for the caprolactam monomer recovery and discharge pipeline according to claim 9, characterized in that: The pneumatic valve of the discharge pipeline is interlocked with one or more of the following: steam solenoid valve, flow meter, opening sensor, discharge tank level gauge, and receiving tank level gauge.

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