Question

You will need graph paper, a calculator, a copy of Appendix I from lesson HTC- 4 2 and access to steam tables to answer this TMA l. A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8) and 15% butene (C,H,) by volume. It is to be fed to the combustion chamber in 10% excess air at 25°C, where it is completely burnt to carbon dioxide and water. The flue gases ane lo he uedorale 5 har sca fhom water a rc 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 fuel:air ratio i) by volume (ii) by mass (d) Calculate: (i) (ii) the net calorific value (CV) per m3 of the fuel/air mix at 25°C the net calorific value (CV) per kmol of the fuel/air mix at 25℃

only question e, f, i, j, k

Answer 1

Combus tion veacon tov each compomnt cn be given as Polloin9 C Jlt, t t-L x 6 (o2t3.3cm) ㅡㅡ!Cout 44LO to妬나 2e.gl 6 NL Poel ond Cobon monoxide (c ehuAt uu

16.32 ③ calorific volueio given In Hot data ci) To Caltdote the Coloricvolve fer kole dr Pudloiv mix -o-1 (htc3H ←o-) (-12207-6)-O-Is(122000