An incinerator produces a dry gas of the following Orsat composition measured at 60oF and 30 in. Hg absolute: 4.0% CO2, 26.0% CO, 2.0% CH4, 16.0% H2, and 52.0% N2. A dry natural gas of the following (Orsat) composition: 80.5% CH4, 17.8% C2H6, and 1.7 N2; is used at the rate of 1200 ft3/min at 60oF and 30 in. Hg absolute to burn in the incineration off-gas with air. The final products of combustion analyze on a dry basis 12.2% CO2, 0.7% CO, 2.4% O2, and 84.7% N2.
Calculate (a) the rate of flow in cubic feet per minute of the incinerator exit gas at 60oF and 30 in. Hg absolute on dry basis, and (b) the rate of air flow in cubic feet per minute, dry, at 80oF and 29.6 in. Hg absolute.