Transformation unit shutdown replacement
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I would like to ask the experts: when a transformation unit is shut down, is it necessary to use a continuous replacement method to replace that unit? Should we still use the voltage regulation mode? Or should consecutive permutations be carried out for a period of time first, followed by pressure-raising and lowering permutations?
It depends; if there is sufficient nitrogen available, continuous displacement can be carried out. Generally, hot nitrogen is used, while we employ intermittent displacement at 0.4 MPa.
Yes, this also provides some protection for the catalyst, preventing a sudden drop in its temperature caused by the introduction of cold nitrogen into the hot bed layer, which could otherwise have an adverse effect on the catalyst.