Can the desulfurization catalyst be used in series with the conversion catalyst and heated together?
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Hydrogen is produced from natural gas, with iron-manganese catalysts and zinc oxide catalysts used for desulfurization. When restarting after a period of shutdown, nitrogen is used for heating in a cyclic manner; the desulfurization catalyst cannot be heated together with the conversion catalyst, as there is a risk that nitrogen passing through the desulfurization tank could carry sulfur into the conversion catalyst. Is this concern valid? Is this how you increase the temperature? Please give me some advice.
Theoretically, as long as the desulfurization agent does not penetrate, there is still sulfur capacity in the middle and lower layers; even any slightly desorbed sulfur will be removed from those layers. Additionally, zinc oxide desulfurization is a form of chemical adsorption and is relatively stable.
Every time we raise the temperature for nitrogen conversion, we also increase the temperature for desulfurization. Moreover, the zinc sulfide formed through zinc oxide-based desulfurization is very stable, and it does not carry sulfur into the conversion furnace
If the amount of nitrogen is high, a secondary line can be added to facilitate the circulation of nitrogen for heating; the nitrogen produced then goes directly into the precision desulfurization process to heat the iron and manganese.