Regarding issues related to methanol distillation, I hope the seniors can offer some guidance.
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The distillation unit used in our plant is a vertical sieve-plate three-column distiller. What confuses me is that the steam control valve of the pre-distillation column reboiler is a gas-shut valve, while the valve for handling non-condensable gases at the top of the column is a gas-open valve; similarly, the valve for non-condensable gases in the second pre-distillation column cooler is also a gas-open valve. So, if the instrument air supply is interrupted, could it have an impact on the pre-distillation column? If so, why was such a design chosen? I would appreciate guidance from those with more experience~~~~~
It must be a mistake, or there’s a misunderstanding regarding the functions of the open-air valve and the closed-air valve. The purpose of designing such valves is to provide effective protection for the safety of system components in the event of a sudden loss of instrument air.