On the catalytic oxidation of ammonia
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Hello everyone. Regarding the catalytic oxidation of ammonia (either under double pressure or single pressure), I was wondering if anyone has any design experience to share. What is needed are the design principles, such as gas calculation (mass of material), energy calculation, and determination of residence time. I would appreciate any guidance you can provide. I’m not interested in overly confidential matters such as selection criteria; I just want to understand the basic principles of gas catalytic oxidation design
As a student from a different major, I have consulted works such as M.E. Poren’s \"Calculations in Inorganic Process Engineering\" from the Soviet Union, the earliest editions of \"Nitric Acid Engineering\", as well as relevant books published in China. In these works, the calculations related to gases are based on the assumption that gases behave as ideal gases, regardless of temperature and pressure. However, using these formulas along with the process operation data I have collected, it turns out that the mixing ratio of ammonia and air in the ammonia-air mixer does not reach the required range of 9.5%-11.5%, which seems strange to me.
MNH3=(PNH3*VNH3)/(R*TNH3)=(0.58MPa*5438m3)/(8.314*373)=1017064Kmol； MAIR = (PAIR * VAIR) / (R * TAIR) = (0.45 MPa * 21,819 m3) / (8.314 * 513) = 2,302,077.7 Kmol; its molar ratio (standard volume ratio) is almost 30%, which is far above 9.5%