Why is it necessary to isolate the hydrogenation reactor when starting up or shutting down a hydrogen production plant?
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Our hydrogen production unit uses hydrocarbon steam reforming for gas generation. The operating procedures state that during shutdown, when the temperature in the hydrogenation reactor becomes uncontrollable within the main circulation system, it is necessary to switch to nitrogen filling for cooling, in order to prevent methanation reactions. But isn’t the catalyst used in such reactions one whose active component is nickel? Can hydrogenation catalysts also undergo methanation reactions? During the startup of the unit, when the temperature rises to a certain level, is it necessary to take the hydrogenation reactor out of service as well? Is this done to prevent the sulfided catalyst from being reduced and becoming inactive?
The methanation reaction is used to prevent overheating, right? But how do you remove the reactor? Generally, crosslines are not installed in reactors for hydrogenation processes.
It is mainly to prevent excessive reduction of the catalyst! Generally, hydrogen production hydrogenation catalysts are cobalt-molybdenum catalysts!