In a green ammonia plant, maintaining cooling water quality is crucial for efficient operation and preventing corrosion. This involves monitoring ammonia levels, potentially adding corrosion inhibitors, and ensuring proper chlorination and chemical cleaning to address biological fouling and corrosion products.
Here's a more detailed explanation:
Importance of Cooling Water Quality:
Cooling water is essential for removing heat generated during the ammonia synthesis process, and it's crucial to maintain its quality to prevent corrosion and ensure efficient operation.
Ammonia itself can be detrimental to cooling water circuits, potentially leading to corrosion, especially of copper and its alloys.
Monitoring and Control:
Online Ammonia Analysis: Continuously monitor ammonia concentrations in cooling water using online process analyzers (e.g., ammonia ion-selective electrodes).
Corrosion Inhibitors: Add triazoles to form sparingly soluble compounds on metal surfaces to inhibit corrosion.
Chlorination: Regularly chlorinate the system to control biological fouling, which can lead to corrosion and reduced cooling efficiency.
Chemical Cleaning: Periodically perform chemical cleaning to remove corrosion products and other impurities.
Why Ammonia is Detrimental:
Ammonia can dissolve in water, forming aqueous ammonia, which can be toxic to some materials and organisms.
Ammonia can also lead to the formation of chloramines, which can further contribute to corrosion.
Other Considerations:
Leakage Prevention: Small leaks and cracks in the steam and cooling water circuits can contaminate the high-purity water in the boiler, causing major problems and necessitating shutdowns for maintenance.
Water Treatment: Green ammonia plants may utilize desalination and borewell water treatment to minimize water consumption and waste.
Cooling Tower Fill: In cooling towers, ensure proper maintenance of induced draft fans and consider increasing the angle of the fans to increase airflow.
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