Question: A three-stage steam ejector with the A 1 /A 2 ratio of 100 was designed to remove 50 kg/h of air from a reflux drum

A three-stage steam ejector with the A 1 /A 2 ratio of 100 was designed to remove 50 kg/h of air from a reflux drum operating at 2.8kPa and 30 C and discharge it to a vent handling system operating at 120kPa. After the system has been commissioned and used in the plant, it was found that the pressure in the reflux drum has risen to 4.3kPa (still at 30 C ). It was suggested that the additional air flowrate (due to leakage) into the system is responsible for the increase in reflux drum pressure. Answer the following questions: a) Estimate the pressure (in kPa ) and temperature (in C ) of the saturate sam required as the motive gas in this steam ejector. b) Estimate the additiona: air flow rate (air leak) responsible for the pressure increase in the reflux drum. c) What course of action do you suggest to maintain the vacuum at the desired level of 2.8kPa ? Molecular weights: H 2 O=18 g/mol, Air =29.8 g/mol The heat capacity ratios of all gases are constant and equal to 1.4

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