Waste heat recovery from the exhaust (flue) gas of
Chapter 13, Problem 13.135(choose chapter or problem)
Waste heat recovery from the exhaust (flue) gas of amelting furnace is accomplished by passing the gasthrough a vertical metallic tube and introducing satu-rated water (liquid) at the bottom of an annularregion around the tube.The tube length and inside diameter are 7 and 1 m,respectively, and the tube inner surface is black. Thegas in the tube is at atmospheric pressure, with CO2and H2O(v) partial pressures of 0.1 and 0.2 atm,respectively, and its mean temperature may be approximated as Tg?1400 K. The gas flow rate ism.?2 kg/s. If saturated water is introduced at a pres-sure of 2.455 bars, estimate the water flow rate m.sforwhich there is complete conversion from saturatedliquid at the inlet to saturated vapor at the outlet.Thermophysical properties of the gas may be approxi-mated as ?530?10?7kg/s?m, k?0.091 W/m?K,and Pr?0.70.
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