equilibrium temperature range
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What does it mean when the equilibrium temperature difference in the hydrogen production conversion section is a negative value?
The steam conversion reaction is an equilibrium reaction; at the outlet of the converter, due to limitations in the reaction rate, there is a discrepancy between the actual composition and the equilibrium composition. This means that the thermodynamic equilibrium temperature corresponding to the actual methane residue at the converter outlet is lower than the actual value. The difference between the equilibrium temperature of this calculation and the actual outlet temperature is called the equilibrium temperature difference. Since the conversion of methane and the resulting production of hydrogen are advantageous at high temperatures, this equilibrium temperature difference is always negative; a smaller equilibrium temperature difference corresponds to higher catalyst activity. The equilibrium temperature difference value obtained during operation is used to characterize the performance of a specific converter catalyst compared to its design.
That’s right; the equilibrium temperature calculated using methane conversion is 788, which is the same as the actual value! But the value calculated using the transformation reaction is 744! The equilibrium temperature difference mentioned in the book is calculated as the transformed temperature minus the calculated conversion temperature; the actual outlet temperature is not used! You said the exact opposite; thank you
How to calculate or determine the equilibrium temperature difference and equilibrium constant