Who has an operation plan for shutting down ammonia synthesis and deactivating the catalysts in the synthesis tower?

For the long-term shutdown of the ammonia synthesis plant, the procedures for deactivating the catalysts in the synthesis tower can be summarized as follows: 1. **Gradually reduce the plant’s load**: Reduce the production load step by step before shutting down operations, until feeding is completely stopped. 2. **Cooling system**: Shut off the feed to the synthesis tower and gradually cool the system to keep the catalyst temperature dropping steadily to a safe range. 3. **Nitrogen purging**: Use nitrogen to thoroughly purge the system, ensuring that there are no residual ammonia or other reactive gases inside the device. This process may require multiple cycles of permutation. 4. **Add a passivator**: Add an appropriate amount of passivator (such as a mixture of nitrogen and a small amount of air) to the synthesis tower to prevent the catalyst from being oxidized. 5. **Sealing**: Ensure that all valves, measuring instruments, etc. are in a closed state to prevent external air or moisture from entering. 6. **Regular inspections**: During periods of shutdown, regularly inspect the equipment to ensure there are no leaks or other abnormalities. It is recommended to have detailed discussions with professionals based on the design and usage of the specific device, in order to develop a more comprehensive set of operating procedures. .