Saturday, 11 February 2017

EQULIBRIUM CONSIDERATIONS

F[CH4 ] F[H2O] 1 Kms = F[CO ] F[H2]3 Pt2 F[CO ] F[H2]3 Kms Pt2 F[CH4] = F[H2O] Equilibrium Considerations CH4 + H2O CO + 3...Effect of Pressure • Exit methane proportional to pressure squared • lower exit methane at lower pressures • overall plant...Effect of Pressure • Exit methane proportional to pressure squared • lower exit methane at lower pressures • overall plant...• Exit methane proportional to Kms • Kms approx inversely proportional to temperature • lower methane requires higher temp...Temperature Pressure Steam/Carbon Ratio Exit Temperature Exit Pressure Steam/Carbon Ratio Exit Gas Composition (% dry) 850...Feedstock Refinery Off Gas Methane Butane Naphtha C/H Ratio CH6 CH4 CH2.5 CH2.2 Exit Gas CH4 CO CO2 H2 6.67 8.14 4.45 80.7...

70 60 50 40 30 20 10 0 Methane Feedstock Exit Temperature 850 C (1472 F) Exit Pressure 30 atas (435 psi) Steam/Carbon Rati...Approach to equilibrium  The system is not actually at equilibrium, but close to it  A measure of catalyst performance i...Temperature oC (oF) 770 780 790 800 810 820 2 4 6 8 10 12 Methaneslip(%) (1418) (1454)(1436) (1472) (1490) Exit CH4 Approa...0 0.2 0.4 0.6 0.8 1 200 (392) 400 (752) 600 (1112) 800 (1472) Fraction down tube TemperatureoC(oF) Gas Temp Eq'm Temp Appr...















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