Reduction conditions for converter catalysts
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Reduction conditions for the conversion catalyst: inlet temperature (480–500°C), outlet temperature of the catalyst bed (≤750°C), H2 content in the recycle gas (≥60%), H2 space velocity (≥300/h), H2O/H ratio (≤7); these conditions are maintained for (8–12) hours after they are achieved
I don’t understand what you mean; it’s like answering a question to oneself
The reduction conditions are basically correct; both the conversion catalyst and the medium-shift catalyst are reduced simultaneously. There are also some points to note: (1) Pay attention to the temperature rise in the medium-shift bed layer; increasing H2 pressure and raising the temperature cannot be done at the same time, otherwise excessive temperature rise may occur. (2) While the conversion catalyst is being reduced, the highly endothermic conversion reaction is also taking place, and the temperature distribution along the tube length will change. During the catalyst reduction stage, the above changes should be closely monitored to assess the progress of the reduction. The reduction process can be considered complete only after the temperature of the outer wall of the conversion tube reaches a normal temperature distribution. (3) The reduction process should avoid prolonged residence times under conditions of high water vapor usage. (4) H2O/H > 0.5 to prevent excessive reduction. (5) Steam must be used for heating only when the inlet temperature of the intermediate transformer is at least 30°C above the steam dew point temperature at that pressure.
That’s exactly it; it’s the same way when we restore it as well