10.25 A fuel gas is made up of 20% propane and 80% CnH2n+2, where n is a whole n

Question

10.25 A fuel gas is made up of 20% propane and 80% CnH2n+2, where n is a whole number. It burned with an oxygen-enriched air stream containing 50% oxygen and 50% nitrogen. The flue gas analyzed 29.72% CO2, 3.49% CO, 7.1796 02 and 59.62% N2. Determine the following: (a) The percent excess air used (b) The empirical formula of CnH2n+2 (c) The rate of air supplied in m2/h at 400 K and 350 kPa if the fuel is burned at a rate of 1000 cubic metres per hour at 300 K and 110 kPa (d) The moisture carried by the flue gas in kg/h.

Explanation / Answer

Data given look like incorrect.

CO is formed when there is incomplete combustion.

Incomplete combustion occur when oxygen is less than the required for combustion. In the given probelm oxygen is in excess as Oxygen is present in flue gas but at same time CO is also present.

Request you to check the data

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