3.(a) Steady flows of octane (C8H18) and air are burning adiabatically in the combustion chamber of a boiler under stoichiometric condition. The air and fuel streams are supplying to the combustion chamber at 79C. With aid of the given table, estimate the adiabatic temperature of the combustion products without dissociation. Enthalpy of Combustion of octane at 298K with water vapor existing in the combustion products: Δh0 = – 44900 kJ/kg.
3.(a) Steady flows of octane (C8H18) and air are burning adiabatically in the combustion chamber of a...
Problem 15.10: Liquid octane (CsHis) enters a steady-flow combustion chamber at 25°C and 1 atm at a rate of 0.35 kg/min. It is burned with 50 percent excess air that also enters at 25°C and 1 atm. After combustion, the products are allowed to cool to 25°C. Assuming complete combustion and that all the H2O in the products is in liquid form, determine (a) the heat transfer rate from the combustion chamber, (b) the entropy generation rate, and (c) the...
A2. Ethylene vapour C2H4 at 27°C is burned in a combustion chamber with 15% excess air, which is also supplied at 27 °C. The temperature and pressure of the products of combustion are 640 °C and 1.1 bar respectively. The heat released in the combustion chamber is used to heat oil. The combustion chamber is well insulated (a) Obtain the stoichiometric and the actual chemical equation for this process [1596] [1096] (b) The air fuel ratio by mass for the...
Liquid propane (C_3H_8) enters a steady-flow combustion chamber at 25 Degree C, and 6 atm at a rate of 0.8 kg/min. It is burned with 150 percent excess air that is compressed and preheated to 400 K and 6 atm before entering the combustion chamber. The products of the combustion enter a gas turbine at 1200 K and 6 tam and leave at 700 K and 1 atm. The adiabatic efficiency of the turbine is 80%. The combustion process is...
An internal combustion engine is running on octane, C8H18 (1) with stoichiometric amount of air. Both the air and fuel enter the engine at room temperature and the exhaust gas leaving the engine contain CO2, CO, H2, N2 and H20. The exhaust temperature is unknown. The brake power is measured and its value is known. It is also estimated that the rate of heat transfer amounts to say, 60% of the brake power; therefore the rate of heat transfer is...
Methane gas is burned with 30 percent excess air. This fuel enters a steady- flow combustor at 0.8 atm and 25oC and is mixed with the air. The products of combustion leave this reactor at 0.8 atm and 1600 K. Determine the equilibrium composition of the products of combustion and the amount of heat released by this combustion in kJ/kmol methane. Use data from the tables CH 25°C CO2, H3O chamber NO. O2 N2 1600 K 30% excess air 25°C...