A problem encountered during the reduction of hydrogen production catalysts
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Steam distribution can only be carried out when the intermediate temperature is higher than the steam dew point temperature (above 220°C). How is this dew point temperature calculated?
Using Dalton’s law of partial pressures, the volume fraction of steam in the mixture can be calculated. Multiplying the operating pressure by this volume fraction gives the partial pressure of steam. By referring to a table that shows the saturated vapor pressure at various temperatures, it is possible to determine the dew point temperature at that operating pressure. Generally, the temperature should be kept 10 degrees or more above the dew point temperature in order to prevent dew point corrosion; however, too high a temperature leads to higher energy consumption
When reducing the catalyst, the temperature during operation reaches the saturation temperature of 2.5 Mp steam; if the bed temperature is low, it prevents condensation into water, which could cause the catalyst to break apart! In fact, during reduction the system pressure is 7-10 kilograms, so there’s no major issue with a 180-degree medium transformation!
The dew point temperature is 180°; below this temperature, steam condenses into water droplets, which can damage the catalyst