9- 519.38 a. b. Any C consumed in reaction (2) is lost to reaction (1). Without the energy released by reaction (2) to compensate for the energy consumed by reaction (1), the temperature in the adiabatic reactor and hence the reaction rate would drop. Basis: 1.00 kg coal fed (+0.500 kg H20) 0.500 kg H20 ⇒1.0kg coal 0.105 kg H2O/kg coal 0.226 kg ash/kg coal 0669.kg combustible / kg coal0.812 kg C / kg combustible0.134 kg O / kg combustible0.054 kg H / kg combustibleRS||T||UV||W||nnnnffff123334563577= [ (1.00)(0.669)(0.812) kg C][1 mol C /12.01 10kg] = 45.23 mol C= (1.00)(0.669)(0.134) /16.0 10mol O= (1.00)(0.669)(0.054) /1.01 10mol H= [ (0.500 + 0.105) kg][1 mol H O /18.016 10kg] = 33.58 mol H O3232××=×−−−−..n0(mol O2) 25°C Product gas at 2500°C 1 kg coal + H2O, 25°C 02002Reactive oxygen (O) available (25.60) mol O35.77 mol H 1 mol O
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This note was uploaded on 01/07/2012 for the course CH E 210H at Penn State.