Why is it necessary to reduce carbon monoxide levels to below 0.1% during the shutdown of medium-pressure methanol plants?
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Why is it necessary to reduce carbon monoxide levels to below 0.1% when shutting down the medium-pressure methanol plant? That’s what the book says, but I don’t understand it. I hope someone experienced can give me some guidance. Also, when shutting down the high-pressure methanol plant, it’s necessary to ensure that all carbon oxides have been completely reacted before stopping the circulation pump.
The same requirement applies to low-pressure alcohols as well.
The purpose of such requirements is as follows: 1. It is a requirement for the catalyst itself, to prevent local overheating of the catalyst due to continued reactions during shutdowns； 2. Safety requirements: approaching the lower explosion limit.
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Prevent, after stopping, the furnace temperature from rising again; without carbon monoxide, there is no heat source for the reaction
The catalyst is sensitive to high concentrations of this substance; after the engine stops, the heat generated by the reaction cannot be dissipated, which can lead to the destruction of the catalyst