Ilie SIMINICEANU
Abstract
This paper deals with the exergy analysis of a nitric acid plant with ammonia oxidation at normal pressure, and chemical absorption at a pressure of 5 bar (1/5 process).The exergy balance model established previously for open chemical systems, and the corresponding exergy efficiency have been used, together with the measured values of operating parameters (temperatures, pressures, flow rates, and concentrations). The exergy efficiency of the 1/5 nitric acid plant determined in this work is 30.52%. The total exergy lost and destructed by irreversibility was 5156 kW from the 7421 kW input. The largest contributions had the ammonia oxidation reactor (44. 97%), the absorption – reaction column (20. 17%), the steam over heater (19. 05%), the water pre-heater (5.77%), and the turbine (4.50 %).The ways to improve the efficiency of these operations are also discussed
Keywords: exergy balanceexergetic efficiencyexergy destroyedexergy lostnitric acid plant
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