Caprolactam pipeline cleaning system and method

Abstract

The invention discloses a caprolactam pipeline cleaning system and method in the technical field of caprolactam cleaning. The cleaning system comprises a caprolactam pipeline and a cleaning pipe, wherein the caprolactam pipeline comprises a caprolactam feeding pipe, a production pipeline, a heater and a polymerization tower; an outlet of the cleaning pipe is connected with the production pipeline;and an inlet of the cleaning pipe communicates with a steam inlet pipe capable of controlling opening and closing and an inert gas inlet pipe capable of controlling opening and closing. In actual production, problems are discovered, and a new system is made to protect existing equipment; through a controller, a pressure sensor and an overvoltage protecting valve, the pressure in the polymerization tower is preferably controlled; all systems are closed pipe systems, so that the manual flushing of pipelines and equipment is not needed, and the potential safety hazards of scald can be preferablyprevented; the equipment is protected; the risk is reduced; and the potential safety hazards caused by higher voltage are preferably solved.

Description

technical field [0001] The invention relates to the technical field of caprolactam cleaning, in particular to a cleaning system and method for a caprolactam pipeline. Background technique [0002] The nylon heater is a device that gradually heats caprolactam at a lower temperature to 235°C. Because of changing the formula, opening a new project, and short-term repairs due to equipment problems, the polymerization reaction tower needs to be carried out. Every time it stops, the pre-heater will There is caprolactam residue, and the residual caprolactam will undergo polymerization reaction, causing pipeline blockage, resulting in damage to the heater, causing losses, or affecting the service life of the heater, whether the second start-up is smooth, and the quality of the final product. [0003] The current cleaning method is usually to manually connect a 2.5bar steam pipe before the pre-heater, and blow the caprolactam in the pre-heater into the pre-polymerization reaction tow...

AI Technical Summary

Problems solved by technology

[0002] The nylon heater is a device that gradually heats caprolactam at a lower temperature to 235°C. Because of changing the formula, opening a new project, and short-term repairs due to equipment problems, the polymerization reaction tower needs to be carried out. Every time it stops, the pre-heater will There is caprolactam residue, and the residual caprolactam will undergo polymerization reaction, causing pipe blockage, resulting in damage to the heater, causing losses, or affecting the service life of the heater, whether the second start-up is smooth, and the quality of the final product

[0003] The current cleaning method is usually to manually connect a 2.5bar steam pipe before the pre-heater, and blow the caprolactam in the pre-heater into the pre-polymerization reaction tower when the car is parked. Manually taking over the pipe has potential safety hazards and is prone to burns and pressure shock injuries. People, and the pressure in the polymerization reaction tower is not easy to control. Once the pressure is too high, it may damage the pipeline and the polymerization reaction tower. If the pressure is too low, it may cause air to enter the polymerization reaction tower. The polymerization reaction tower needs anaerobic operation. Entering will destroy the production, and the manual operation process is cumbersome, the cleaning is not clean, and the manual operation is easy to cause secondary pollution to the pipeline. There is no cleaning process for oxygen intake and water removal. Pollution will lead to an increase in the scrap rate during re-production, and the pipes and equipment are always filled with water vapor, and the pipes and equipment may be rusted by high-temperature and high-pressure water vapor

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