A fuel gas stream of 100 kmol h1 is preheated to 150 °C and then sent to a boiler.The fuel gas contains 90 % of CH4 by mole and N2.

The air is supplied with 15%excess, to ensure the combustion completion. The flue gas is vented at 150 °C. (i)Use a sketch to represent the process with the operation conditions. (ii) Complete the mass balance and report the results as TABLE Q1 in your answer booklet. (iii) Calculate the heat generation rate in the boiler, in MW. (iv) The heat exchanged in the boiler is used to generate saturated steam at 3bar from saturated liquid water at 1.01325 bar. Calculate the mass flow rate of the saturated steam generated in kg s1 by using the data in TABLE Q2.