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Steam Reforming - Coggle Diagram
Steam Reforming
Methane slip
steam reformers operate at pressures far above atmospheric, although thermodynamically unfavorable
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Advantages of operating at elevated pressure - lower syngas compression costs and a smaller reformer size
counterbalance the negative effect on the equilibrium, higher temperatures are applied and excess steam is used
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Steam Reforming Process
catalyst is still required to accelerate the reaction - steam reforming is carried out at high temperature (>1000 K) due to the very high stability of methane
In the convection section, heat recovered from hot flue gases is used for preheating of the gas feed and process steam and superheated steam generation
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Carbon Formation
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At high temperature (>920 K) steam cracking occur to form alkenes that easily form carbon through reaction:
CnH2n → carbon + H2 ∆ rH298 < 0 kJ/mol
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