Natural gas containing a mixture of methane, ethane, propane, and butane is burned in a furnace with excess air.
- One hundred kmol/h of a gas containing 94.4mole% methane, 3.40% ethane, 0.60% propane, and 0.50% butane is to be burned with 17% excess air. Calculate the required molar flow rate of the air.
- Let hi(kmol/h) = molar flow* of the fuel gas
Xi, x2, x3, x» = mole fractions of methane, ethane, propane.
and butane, respectively, in the fuel = percent excess air
na( kmol/h) = molar flowr rate of the air ted to the furnace
Derive an expression for na in terms of the other variables. Check your formula with the results of Part (a).
Test your program on the data given below, assuming that 15% excess air is required in all cases. Then explore the effects of variations in and Rfon hafor the values of Af — A4 given on the third line of the data table. Briefly explain your results.
Rt | A, | a2 | a3 | A4 |
62 | 248.7 | 19.74 | 6.35 | 1.48 |
83 | 305.3 | 14.57 | 2.56 | 0.70 |
108 | 294.2 | 16.61 | 4.78 | 2.11 |
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