The impact of gas phase waste heat recovery at the top of the tower on operation
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As shown in the figure, the overhead condenser in this figure uses a waste heat boiler. Although the phase change is equivalent to reducing energy consumption, will there be any specific adverse effects on the distillation operation? The condensation capacity is definitely limited by the back pressure of the MS pipe network. Is this distillation tower designed to have a column pressure of 400KPaA just because the process package needs to recover the heat at the top of the tower?
Personally, I feel that the tower top pressure should be prioritized during design. The purpose is distillation, followed by energy recovery. Since it is designed in this way, the distillation tower will be designed according to this condition, and the impact of production operations will be considered to maintain a certain margin. The ultimate goal is to be able to complete the distillation task well. Of course, if the by-product steam is sent to the official website, you can consider adding a secondary line and adding a small condenser (appropriate consideration of the split flow, only as a supplementary adjustment method).