Exergy analysis and optimisation of nitric acid production plant
by Oludare Johnson Odejobi; Atilade Amos Oladunni; Grace Oluwaseun Gbadebo
International Journal of Exergy (IJEX), Vol. 42, No. 2, 2023

Abstract: Ostwald process for nitric acid production was simulated using Aspen HYSYS. Effects of input parameters on concentration of nitric acid in the product show increase in mole fraction with increasing ammonia and air flow rates but decrease as feed water flow rate increases. Separator has highest exergetic efficiency of 90.4%. Optimum conversion for absorber, feed water temperature and flow rate are 70%, 25.5°C and 3,000 kg/h, respectively for exergetic efficiency and 69.8%, 25.49°C and 3,500 kg/hr, respectively for irreversibility. Flow rate for economical operation of the plant was 800 and 12,000 kg/h for ammonia and air, respectively.

Online publication date: Mon, 30-Oct-2023

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