Summary post on the shutdown of ammonia synthesis plants, system purging, and related issues

Thread Content

1. Shutdown plan 2. Shutdown plan for the ammonia synthesis unit during major repairs 3. Shutdown plan for the shift responsible for conversion processes 4. Improvement of methods for recovering process condensate during the start-up and shutdown phases of the ammonia synthesis unit 5. Shutdown plan for the shift responsible for conversion processes 6. Plan for long-term shutdown and replacement of components in the decarburization unit 7. Normal start-up and shutdown of the synthesis unit 8. How to prevent the internal components of the synthesis tower from being crushed during start-up and shutdown, and how to protect these components? 1 2 9. Purging plan after shutting down the ammonia synthesis system 10. How to protect the low-pressure converter and synthesis catalysts during a 20-day shutdown 11. What precautions should be taken when shutting down a large-scale ammonia synthesis system? 12. Shutdown of ammonia synthesis 13. Why is it necessary to maintain the system pressure at around 1.8 MP during the shutdown of ammonia synthesis? 1 2 14. The shutdown solenoid valves used in the turbines of various affiliated units 15. How to handle a pressure difference of 1.0 MP in the ammonia synthesis heat exchangers without shutting down the system? 16. How should the ammonia addition at the synthesis tower station be coordinated during the start-up and shutdown of ammonia absorption? 17. How is the desulfurization system maintained during long-term parking in winter? What to do with the desulfurization liquid? 18. Forced shutdown due to methanol washing. 19. Reasons for the shutdown of the ammonia synthesis high-pressure compressor due to lack of oil pressure? 20. What are the reasons for high oxygen levels during the inerting process when starting up or shutting down a gas generation unit? 21. What is the reason for a temperature drop of several degrees in the lower bed layer during parking? 22. What are the reasons for an increase in oxygen content during the start-up and shutdown of gas generation? 23. Purging plan after shutting down the ammonia synthesis system. 24. Purging methods for refrigeration systems. 25. Purging of the ammonia synthesis system. 1 2 26. Purging of systems involving liquid ammonia and ammonia water in ammonia synthesis. 1 2 27. How to purge and flush water after maintenance of the cold ammonia pump to prevent it from freezing? 28. Purging of the ammonia synthesis system. 29. Issues related to system purging. 30. Purging of ammonia tanks. 31. Liquid removal and nitrogen purging plans for the decarburization system in large ammonia synthesis plants. 32. System purging for low-temperature methanol washing. 33. Nitrogen purging plan for the liquid ammonia station in ammonia synthesis units.doc 34. Purging plan for long-term shutdowns of the decarburization unit. Last edited by Huang Xinhui on 2009-3-17 at 22:58.]