I beg! Issues regarding ammonia injection at the start of hydrogen production reduction
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When the hydrogen production plant is brought online and the conversion catalyst begins to be reduced, and there is no other source of hydrogen available, ammonia is added to supply hydrogen. At what condition should ammonia be added? Is it when the temperature for ammonia decomposition is reached, or when the reduction conditions are met? What is the temperature for ammonia decomposition? I need experts’ advice!
Before hydrogenation reduction, steam must be supplied; at this time, the temperature at the outlet of the converter is above 500°C, and the temperature in the furnace tubes is above 800°C. Ammonia can be formed only when the reduction conditions are met. The temperature for ammonia cracking is generally 800–850°C.
Ammonia addition for reduction can begin when the bed temperature is above 650°C; after ammonia addition, the temperature is raised further until it reaches 470°C at the conversion inlet and 750°C at the conversion outlet, with the bed temperature remaining around 850°C–900°C.