Device for preventing cyclohexanone oxime pipeline from being blocked
By adding a nitrogen regulating valve and return pipeline to the cyclohexanone oxime pipeline, the problem of cyclohexanone oxime pipeline is solved, and safe and efficient pipeline dredging is achieved, which is suitable for multi-stage rearrangement reaction systems.
Patent Information
- Application Number
- CN202422447472.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-10
AI Technical Summary
Cyclohexanone oxime pipelines are prone to blockage in parking or emergency situations, resulting in safety risks and waste of materials. The existing dredging methods have safety hazards and environmental pollution.
Design a device to prevent clogging of cyclohexanone oxime pipes. By adding a nitrogen regulating valve and return pipeline, use medium pressure nitrogen to purge the pipes in parking or emergency situations, and return the liquid cyclohexanone oxime to the storage tank when necessary to avoid excessive pipeline pressure.
Remote automatic control of pipeline purge is realized, reducing safety risks and material waste, and is suitable for the treatment of a variety of high-freezing point materials.
Smart Images
Figure CN223178645U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pipeline blockage, in particular to a device for preventing the blockage of cyclohexanone oxime pipelines. Background Technique
[0002] Cyclohexanone oxime, also known as glycine amide hydrochloride, hydrochloric acid glycine amide, and aminoacetyl hydrochloride, is a white prismatic crystal at room temperature, with a melting point of 89-90°C. It is a heat-sensitive material and an intermediate product in the production process of caprolactam. In most of the international caprolactam production processes, the liquid-phase rearrangement process method is used. The main reaction principle is that liquid cyclohexanone oxime undergoes a rearrangement reaction in a rearrangement reactor in the presence of fuming sulfuric acid, and cyclohexanone oxime is rearranged to form caprolactam. At present, almost all of the cyclohexanone oxime in the production of caprolactam by the liquid-phase rearrangement process method is added in two batches to different reaction kettles for reaction (commonly known as two-stage rearrangement in the industry) to improve the yield and quality of caprolactam.
[0003] The pipeline distance from the liquid cyclohexanone oxime in the cyclohexanone oxime storage tank to the rearrangement reactor is at least dozens of meters and at most hundreds of meters. At the same time, filters, flow meters, regulating valves, and multiple elbow pipe fittings are arranged on the pipeline. The pipeline is heated by jacketed hot water at 90-92°C. During normal or emergency shutdown, it is necessary to immediately withdraw the liquid cyclohexanone oxime in the pipeline from the pipeline to prevent the blockage of the liquid cyclohexanone oxime pipeline due to weak fluidity of the liquid cyclohexanone oxime, poor heat tracing effect, or misoperation by personnel. After the cyclohexanone oxime pipeline is blocked, almost all in the current industry use artificial connection of temporary steam pipelines for heating and purging to dredge or replace the blocked pipeline or pipe fittings; there are safety risks such as high-temperature scalding and poisoning of operators during the pipeline dredging process. At the same time, the cyclohexanone oxime melted and purged by steam heating pollutes the environment and causes material waste.
[0004] Based on this, a device for preventing the blockage of cyclohexanone oxime pipelines is now provided, which can eliminate the drawbacks of existing devices. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a device for preventing the blockage of cyclohexanone oxime pipelines to solve the problems in the background technique.
[0006] To achieve the above purpose, the utility model provides the following technical solutions:
[0007] A device for preventing the blockage of cyclohexanone oxime pipelines, comprising: a cyclohexanone oxime storage tank, the outlet of the cyclohexanone oxime storage tank is connected to the inlet of a cyclohexanone oxime transfer pump through a cyclohexanone oxime transfer pump inlet pipeline, the outlet of the cyclohexanone oxime transfer pump is connected to one end of a cyclohexanone oxime transfer pump outlet pipeline, and the other end of the cyclohexanone oxime transfer pump outlet pipeline branches out three branch ports and is respectively connected to one end of a cyclohexanone oxime transfer pump reflux regulating valve, a first rearrangement reactor shut-off valve, and a second rearrangement reactor shut-off valve.
[0008] Based on the above technical solution, the present utility model also provides the following optional technical solutions:
[0009] In an optional solution: the other end of the cyclohexanone oxime transfer pump reflux regulating valve is connected to the return port of the cyclohexanone oxime storage tank through a cyclohexanone oxime transfer pump reflux pipeline.
[0010] In an optional solution: the other end of the first rearrangement reactor shut-off valve is connected to the inlet of a first rearrangement reactor flowmeter through a first rearrangement reactor shut-off valve outlet pipeline, the outlet of the first rearrangement reactor flowmeter is connected to one end of a first rearrangement reactor flow regulating valve through a first rearrangement reactor flowmeter outlet pipeline, and the other end of the first rearrangement reactor flow regulating valve is connected to the inlet of a first rearrangement reactor through a first rearrangement reactor flow regulating valve outlet pipeline.
[0011] In an optional solution: the other end of the second rearrangement reactor shut-off valve is connected to the inlet of a second rearrangement reactor flowmeter through a second rearrangement reactor shut-off valve outlet pipeline, the outlet of the second rearrangement reactor flowmeter is connected to one end of a second rearrangement reactor flow regulating valve through a second rearrangement reactor flowmeter outlet pipeline, and the other end of the second rearrangement reactor flow regulating valve is connected to the inlet of a second rearrangement reactor through a second rearrangement reactor flow regulating valve outlet pipeline.
[0012] In an optional solution: a branch pipe is branched out from the first rearrangement reactor shut-off valve outlet pipeline and is connected to one end of a first rearrangement reactor nitrogen shut-off valve, and the other end of the first rearrangement reactor nitrogen shut-off valve is connected to one end of a nitrogen regulating valve through a nitrogen regulating valve outlet pipeline.
[0013] In an optional solution: a branch pipe is branched out from the second rearrangement reactor shut-off valve outlet pipeline and is connected to one end of a second rearrangement reactor nitrogen shut-off valve, and the other end of the second rearrangement reactor nitrogen shut-off valve is connected to one end of a nitrogen regulating valve through a nitrogen regulating valve outlet pipeline
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0015] The utility model adds a nitrogen regulating valve discharge pipeline. After the rearrangement reaction system stops, the blocked pipeline can be purged by introducing medium-pressure nitrogen through the corresponding valves, achieving remote automatic control of purging the cyclohexanone oxime pipeline. By adding a reflux pipeline, when both the first-stage and second-stage rearrangement reaction systems stop, by opening the reflux regulating valve of the cyclohexanone oxime transfer pump, the liquid cyclohexanone oxime can be refluxed into the cyclohexanone oxime storage tank, ensuring that the pressure in the pipeline will not be too high. This device has a wide range of applications and can be used for various high freezing point materials that need to discharge materials during shutdown or emergency situations, and can be used for multiple stages of rearrangement such as the first-stage rearrangement and the third-stage rearrangement. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic structural diagram of the utility model.
[0017] NOTES ON REFERENCE NUMERALS IN THE DRAWINGS: 1. Cyclohexanone oxime storage tank; 2. Inlet pipeline of cyclohexanone oxime transfer pump; 3. Cyclohexanone oxime transfer pump; 4. Outlet pipeline of cyclohexanone oxime transfer pump; 5. Reflux regulating valve of cyclohexanone oxime transfer pump; 6. Reflux pipeline of cyclohexanone oxime transfer pump; 7. Cut-off valve of the first-stage rearrangement reactor; 8. Discharge pipeline of the cut-off valve of the first-stage rearrangement reactor; 9. Flowmeter of the first-stage rearrangement reactor; 10. Discharge pipeline of the flowmeter of the first-stage rearrangement reactor; 11. Flow regulating valve of the first-stage rearrangement reactor; 12. Discharge pipeline of the flow regulating valve of the first-stage rearrangement reactor; 13. Cut-off valve of the second-stage rearrangement reactor; 14. Discharge pipeline of the cut-off valve of the second-stage rearrangement reactor; 15. Flowmeter of the second-stage rearrangement reactor; 16. Discharge pipeline of the flowmeter of the second-stage rearrangement reactor; 17. Flow regulating valve of the second-stage rearrangement reactor; 18. Discharge pipeline of the flow regulating valve of the second-stage rearrangement reactor; 19. Nitrogen regulating valve; 20. Discharge pipeline of the nitrogen regulating valve; 21. Nitrogen cut-off valve of the first-stage rearrangement reactor; 22. Nitrogen cut-off valve of the second-stage rearrangement reactor. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] In order to make the purpose, technical solutions and advantages of the utility model clearer, the following further details the utility model in conjunction with the drawings and embodiments.
[0019] In one embodiment, as Figure 1As shown in the figure, a device for preventing the blockage of cyclohexanone oxime pipelines, including a cyclohexanone oxime storage tank 1. The outlet of the cyclohexanone oxime storage tank 1 is connected to the inlet of a cyclohexanone oxime transfer pump 3 through a cyclohexanone oxime transfer pump inlet pipeline 2. The outlet of the cyclohexanone oxime transfer pump 3 is connected to one end of a cyclohexanone oxime transfer pump outlet pipeline 4. The other end of the cyclohexanone oxime transfer pump outlet pipeline 4 branches out into three branches and is respectively connected to one end of a cyclohexanone oxime transfer pump reflux regulating valve 5, a first rearrangement reactor shut-off valve 7, and a second rearrangement reactor shut-off valve 13. The liquid cyclohexanone oxime in the cyclohexanone oxime storage tank 1 flows into the cyclohexanone oxime transfer pump 3 through the cyclohexanone oxime transfer pump inlet pipeline 2, is pressurized by the cyclohexanone oxime transfer pump 3, and is transported through the cyclohexanone oxime transfer pump outlet pipeline 4. The cyclohexanone oxime transfer pump outlet pipeline 4 branches out into three branches and is respectively connected to the cyclohexanone oxime transfer pump reflux regulating valve 5, the first rearrangement reactor shut-off valve 7, and the second rearrangement reactor shut-off valve 13, and then enters different devices.
[0020] In this embodiment, as Figure 1 shown, the other end of the cyclohexanone oxime transfer pump reflux regulating valve 5 is connected to the return port of the cyclohexanone oxime storage tank 1 through a cyclohexanone oxime transfer pump reflux pipeline 6. When both the first and second rearrangement reaction systems are shut down, by opening the cyclohexanone oxime transfer pump reflux regulating valve, the liquid cyclohexanone oxime can be refluxed into the cyclohexanone oxime storage tank, ensuring that the pressure in the pipeline will not be too high and causing damage to the device.
[0021] In one embodiment, as Figure 1 shown, the other end of the first rearrangement reactor shut-off valve 7 is connected to the inlet of a first rearrangement reactor flowmeter 9 through a first rearrangement reactor shut-off valve outlet pipeline 8. The outlet of the first rearrangement reactor flowmeter 9 is connected to one end of a first rearrangement reactor flow regulating valve 11 through a first rearrangement reactor flowmeter outlet pipeline 10. The other end of the first rearrangement reactor flow regulating valve 11 is connected to the inlet of the first rearrangement reactor through a first rearrangement reactor flow regulating valve outlet pipeline 12. The liquid cyclohexanone oxime passes through the first rearrangement reactor shut-off valve 7 and the first rearrangement reactor shut-off valve outlet pipeline 8 and enters the first rearrangement reactor flowmeter 9 to measure the flow rate and volume of the fluid in the pipeline, so as to understand the state of the fluid. Then, the first rearrangement reactor flowmeter 9 enters the first rearrangement reactor flow regulating valve 11 through the first rearrangement reactor flowmeter outlet pipeline 10. The flow rate and volume of the fluid in the pipeline are regulated by the first rearrangement reactor flow regulating valve 11, and the liquid cyclohexanone oxime finally enters the first rearrangement reactor.
[0022] In one embodiment, as Figure 1As shown, the other end of the second-stage rearrangement reactor shut-off valve 13 is connected to the input port of the second-stage rearrangement reactor flowmeter 15 through the second-stage rearrangement reactor shut-off valve discharge pipeline 14. The output port of the second-stage rearrangement reactor flowmeter 15 is connected to one end of the second-stage rearrangement reactor flow regulating valve 17 through the second-stage rearrangement reactor flowmeter discharge pipeline 16. The other end of the second-stage rearrangement reactor flow regulating valve 17 is connected to the feed port of the second-stage rearrangement reactor through the second-stage rearrangement reactor flow regulating valve discharge pipeline 18. Liquid cyclohexanone oxime enters the second-stage rearrangement reactor flowmeter 15 through the second-stage rearrangement reactor shut-off valve 13 and the second-stage rearrangement reactor shut-off valve discharge pipeline 14 to measure the flow rate and flow of the fluid in the pipeline, and the state of the fluid can be understood. Then, it enters the second-stage rearrangement reactor flow regulating valve 17 through the second-stage rearrangement reactor flowmeter discharge pipeline 16 by the second-stage rearrangement reactor flowmeter 15. The flow rate and flow of the fluid in the pipeline are regulated by the second-stage rearrangement reactor flow regulating valve 17, and liquid cyclohexanone oxime finally enters the second-stage rearrangement reactor.
[0023] In one embodiment, as Figure 1 shown, a branch pipe is separated from the first-stage rearrangement reactor shut-off valve discharge pipeline 8 and connected to one end of the first-stage rearrangement reactor nitrogen shut-off valve 21. The other end of the first-stage rearrangement reactor nitrogen shut-off valve 21 is connected to one end of the nitrogen regulating valve 19 through the nitrogen regulating valve discharge pipeline 20. When the first-stage rearrangement reaction system stops, after the first-stage rearrangement reactor shut-off valve 7 is closed and the first-stage rearrangement reactor flowmeter 9 is lower than a certain set value, the first-stage rearrangement reactor nitrogen shut-off valve 21 has the opening condition. At this time, the nitrogen regulating valve 19 is remotely opened first and then the first-stage rearrangement reactor nitrogen shut-off valve 21 is opened. Using the pressure of medium-pressure nitrogen (0.7 - 0.8 MPa.G), the liquid cyclohexanone oxime in the nitrogen regulating valve 19, nitrogen regulating valve discharge pipeline 20, first-stage rearrangement reactor nitrogen shut-off valve 21, first-stage rearrangement reactor shut-off valve discharge pipeline 8, first-stage rearrangement reactor flowmeter 9, first-stage rearrangement reactor flowmeter discharge pipeline 10, first-stage rearrangement reactor flow regulating valve 11, and first-stage rearrangement reactor flow regulating valve discharge pipeline 12 is blown into the first-stage rearrangement reactor.
[0024] In one embodiment, as Figure 1As shown, a branch pipe is separated from the discharge pipeline 14 of the two-stage rearrangement reactor cutoff valve and is connected to one end of the nitrogen cutoff valve 22 of the two-stage rearrangement reactor. The other end of the nitrogen cutoff valve 22 of the two-stage rearrangement reactor is connected to one end of the nitrogen regulating valve 19 through the nitrogen regulating valve discharge pipeline 20. When the two-stage rearrangement reaction system is shut down, after the two-stage rearrangement reactor cutoff valve 13 is closed and when the flowmeter 15 of the two-stage rearrangement reactor is lower than a certain set value, the nitrogen cutoff valve 22 of the two-stage rearrangement reactor meets the opening condition. At this time, remotely open the nitrogen regulating valve 19 first and then open the nitrogen cutoff valve 22 of the two-stage rearrangement reactor. Utilizing the pressure of medium-pressure nitrogen (0.7 - 0.8 MPa.G), through the nitrogen regulating valve 19, the nitrogen regulating valve discharge pipeline 20, the nitrogen cutoff valve 22 of the two-stage rearrangement reactor, the discharge pipeline 14 of the two-stage rearrangement reactor cutoff valve, the flowmeter 15 of the two-stage rearrangement reactor, the discharge pipeline 16 of the two-stage rearrangement reactor flowmeter, the flow regulating valve 17 of the two-stage rearrangement reactor, and the discharge pipeline 18 of the two-stage rearrangement reactor flow regulating valve, the liquid cyclohexanone oxime in the pipeline is blown into the two-stage rearrangement reactor.
[0025] The above embodiment discloses a device for preventing blockage of the cyclohexanone oxime pipeline. Among them, when the two-stage rearrangement reaction system is shut down, the operation is as follows: after the two-stage rearrangement reactor cutoff valve 13 is closed and when the flowmeter 15 of the two-stage rearrangement reactor is lower than a certain set value, the nitrogen cutoff valve 22 of the two-stage rearrangement reactor meets the opening condition. At this time, remotely open the nitrogen regulating valve 19 first and then open the nitrogen cutoff valve 22 of the two-stage rearrangement reactor. Utilizing the pressure of medium-pressure nitrogen (0.7 - 0.8 MPa.G), through the nitrogen regulating valve 19, the nitrogen regulating valve discharge pipeline 20, the nitrogen cutoff valve 22 of the two-stage rearrangement reactor, the discharge pipeline 14 of the two-stage rearrangement reactor cutoff valve, the flowmeter 15 of the two-stage rearrangement reactor, the discharge pipeline 16 of the two-stage rearrangement reactor flowmeter, the flow regulating valve 17 of the two-stage rearrangement reactor, and the discharge pipeline 18 of the two-stage rearrangement reactor flow regulating valve, the liquid cyclohexanone oxime in the pipeline is blown into the two-stage rearrangement reactor.
[0026] When both the first-stage and second-stage rearrangement reaction systems are shut down and a circulation is established among the cyclohexanone oxime storage tank 1, the inlet pipeline 2 of the cyclohexanone oxime transfer pump, the cyclohexanone oxime transfer pump 3, the outlet pipeline 4 of the cyclohexanone oxime transfer pump, the reflux regulating valve 5 of the cyclohexanone oxime transfer pump, and the reflux pipeline 6 of the cyclohexanone oxime transfer pump, the operation is as follows: After the cut-off valve 7 of the first-stage rearrangement reactor is closed and the flowmeter 9 of the first-stage rearrangement reactor is below a certain set value, the nitrogen cut-off valve 21 of the first-stage rearrangement reactor is ready to be opened. At this time, remotely first open the nitrogen regulating valve 19 and then open the nitrogen cut-off valve 21 of the first-stage rearrangement reactor. Utilize the pressure of medium-pressure nitrogen (0.7 - 0.8 MPa.G) to blow the liquid cyclohexanone oxime in the pipeline through the nitrogen regulating valve 19, the nitrogen regulating valve discharge pipeline 20, the nitrogen cut-off valve 21 of the first-stage rearrangement reactor, the cut-off valve discharge pipeline 8 of the first-stage rearrangement reactor, the flowmeter 9 of the first-stage rearrangement reactor, the flowmeter discharge pipeline 10 of the first-stage rearrangement reactor, the flow regulating valve 11 of the first-stage rearrangement reactor, and the flow regulating valve discharge pipeline 12 of the first-stage rearrangement reactor into the first-stage rearrangement reactor. After the cut-off valve 13 of the second-stage rearrangement reactor is closed and the flowmeter 15 of the second-stage rearrangement reactor is below a certain set value, the nitrogen cut-off valve 22 of the second-stage rearrangement reactor is ready to be opened. At this time, remotely first open the nitrogen regulating valve 19 and then open the nitrogen cut-off valve 22 of the second-stage rearrangement reactor. Utilize the pressure of medium-pressure nitrogen (0.7 - 0.8 MPa.G) to blow the liquid cyclohexanone oxime in the pipeline through the nitrogen regulating valve 19, the nitrogen regulating valve discharge pipeline 20, the nitrogen cut-off valve 22 of the second-stage rearrangement reactor, the cut-off valve discharge pipeline 14 of the second-stage rearrangement reactor, the flowmeter 15 of the second-stage rearrangement reactor, the flowmeter discharge pipeline 16 of the second-stage rearrangement reactor, the flow regulating valve 17 of the second-stage rearrangement reactor, and the flow regulating valve discharge pipeline 18 of the second-stage rearrangement reactor into the second-stage rearrangement reactor.
[0027] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims
1. An apparatus for preventing blockage of cyclohexanone oxime pipelines, characterized in that, Including: A cyclohexanone oxime storage tank (1), the discharge port of the cyclohexanone oxime storage tank (1) is connected to the input port of a cyclohexanone oxime transfer pump (3) through a cyclohexanone oxime transfer pump inlet pipeline (2), the output port of the cyclohexanone oxime transfer pump (3) is connected to one end of a cyclohexanone oxime transfer pump outlet pipeline (4), and the other end of the cyclohexanone oxime transfer pump outlet pipeline (4) branches out into three branch ports and is respectively connected to one end of a cyclohexanone oxime transfer pump reflux regulating valve (5), a cut-off valve (7) for the first-stage rearrangement reactor, and a cut-off valve (13) for the second-stage rearrangement reactor.
2. The device for preventing the blockage of cyclohexanone oxime pipeline according to claim 1, wherein, The other end of the cyclohexanone oxime transfer pump reflux regulating valve (5) is connected to the return port of the cyclohexanone oxime storage tank (1) through a cyclohexanone oxime transfer pump reflux pipeline (6).
3. The device for preventing the blockage of cyclohexanone oxime pipelines according to claim 1, wherein, The other end of the cut-off valve (7) for the first-stage rearrangement reactor is connected to the input port of a first-stage rearrangement reactor flowmeter (9) through a cut-off valve discharge pipeline (8) for the first-stage rearrangement reactor, the output port of the first-stage rearrangement reactor flowmeter (9) is connected to one end of a first-stage rearrangement reactor flow regulating valve (11) through a first-stage rearrangement reactor flowmeter discharge pipeline (10), and the other end of the first-stage rearrangement reactor flow regulating valve (11) is connected to the feed port of the first-stage rearrangement reactor through a first-stage rearrangement reactor flow regulating valve discharge pipeline (12).
4. The device for preventing the blockage of cyclohexanone oxime pipeline according to claim 1, characterized in that, The other end of the cut-off valve (13) for the second-stage rearrangement reactor is connected to the input port of a second-stage rearrangement reactor flowmeter (15) through a cut-off valve discharge pipeline (14) for the second-stage rearrangement reactor, the output port of the second-stage rearrangement reactor flowmeter (15) is connected to one end of a second-stage rearrangement reactor flow regulating valve (17) through a second-stage rearrangement reactor flowmeter discharge pipeline (16), and the other end of the second-stage rearrangement reactor flow regulating valve (17) is connected to the feed port of the second-stage rearrangement reactor through a second-stage rearrangement reactor flow regulating valve discharge pipeline (18).
5. The device for preventing the blockage of cyclohexanone oxime pipeline according to claim 3, characterized in that, A branch pipe is branched out from the cut-off valve discharge pipeline (8) for the first-stage rearrangement reactor and is connected to one end of a nitrogen cut-off valve (21) for the first-stage rearrangement reactor, and the other end of the nitrogen cut-off valve (21) for the first-stage rearrangement reactor is connected to one end of a nitrogen regulating valve (19) through a nitrogen regulating valve discharge pipeline (20).
6. The device for preventing the blockage of cyclohexanone oxime pipelines according to claim 4, characterized in that, A branch pipe is branched out from the cut-off valve discharge pipeline (14) for the second-stage rearrangement reactor and is connected to one end of a nitrogen cut-off valve (22) for the second-stage rearrangement reactor, and the other end of the nitrogen cut-off valve (22) for the second-stage rearrangement reactor is connected to one end of a nitrogen regulating valve (19) through a nitrogen regulating valve discharge pipeline (20).