Consider a fuel that is burned with (a) 130 percent theoretical air and (b) 70 percent excess air. In which case is the fuel burned with more air?
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Consider a fuel that is burned with (a) 130 percent theoretical air and (b) 70 percent excess
air. In which case is the fuel burned with more air?
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- Dodecane is burned at constant pressure with 120% excess air. What is the actual air fuel ratio for this process? (A) 55 (B) 22 44 (D) 33A fuel mixture of 60 percent by mass methane (CH4) and 40 percent by mass ethanol (C2H6O), is burned completely with theoretical air. If the total flow rate of the fuel is 10 kg/s, determine the required flow rate of air.Liquid octane is burned completely with 75% excess air. Determine the air-fuel ratio for this combustion process.
- Ethane (C2H6) is burned completely with 25% excess air. Show the combustion reaction of fuel and air. Determine the actual air-fuel ratio in kgair/kgfuel.Methanol (CH3OH) is burned with 50% excess air. Write the balanced reaction equations for complete and actual combustion, and then determine (a) the actual air-to-fuel ratio, and (b) the enthalpy of the complete combustion of Methanol at 25°C and 1 atm assuming H₂O in the products is in the liquid form. N₁ hc=Hp-HR=Nphp-ENRIR TABLE 32 Standard enthalpies of formation Species State! 0₁ Gas Gav Ga Gas Gas Gas H₁ C. Co, но 1,0 CO Useful relations: Mair 123 ful C,H, CH,OH CH,OH Liqind Gas Gas Gas Gas Liquid Gas Liquid AF C₂B₁ сн.. At 298.15 K (25 C) and 1 aus Ah,, MJ/kmol 0 0 0 0 -393.52 241.83 285.84 110.54 -74.87 -101.85 -201.17 238.58 208.45 249.351 kmol C2H6 is burned with an unknown amount of air. At the end of combustion since it is known that there is 3 kmol free oxygen in the combustion products, the air fuel ratio and calculate the theoretical percentage of air used during this process.
- 5. Dodecane is burned at constant pressure with 120% excess air. What is the air-fuel ratio for this process?Propal alcohol (C3H7OH) is burned with 50 percent excess air. Write the balanced reaction equation for complete combustion and determine the air-to-fuel ratio.Ethane (C2H6) is burned with 20% excess air during a combustion process. Assuming completecombustion and a total pressure of 100 kPa, determine:1. the A/F ratio.2. the dew point temperature of the products.
- A sample of coal was found to have the following percentage composition C=75 %, H2 = 5.2 %, O2 = 12.8 %, N2 = 1.2 % and the rest ash. Calculate the amount of air needed for the complete combustion if 1 kg of the coal is burnt with 30 % excess air.Ethane (C2H6) is burned with atmospheric air and the volumetric analysis of the dry products of combustion yields the following: 10% CO2, 1% CO, 3% 02 and 86% N2. Develop the combustion equation and determine (a) the percentage of the excess air (b) the air fuel ratio. (Solve for 100 kmol of dry products).Question No. 11: One kmol of octane C8H18 is burned with air that contains 20kmol of O2. Assuming the product contains only CO2, H20, 02and N2, determine the mol number of each gas in the products and the air-fuel ratio for this combustion process.