Question

l Virgin * 01:06 eat.tees.ac.uk You will need graph paper, a caleulator, a copy of Appendix I from lesson HTC-4-2 and access to steam tables to answer this TMA A fuel gas consists of 75% butane (C,Hio), 10% propane (C,Hs) and 15% butene (C4H by volume l. It is to be fed to the combustion chamber in 10% excess air at 25C. where it is completely burnt to carbon dioxide and water. The flue gases produced are to be used to generate 5 bar steam from water at C With the aid of the data at the end of the question, steam tables and the enthalpy table given in the Appendix of lesson HTC-4-2 (a) Write balanced equations for the combustion of each component of the fuel gas. (b) Explain the need for excess air. (c) Determine the actual fuclair ratio 6) by volume (ii) by mass (d) Calculate: 6) the net calorific value (CV) per m2 of the fuel/air mix at 25C Gi) the net calorific value (CV) per kmol of the fucl/air mix at 25 C

Answer 1