| 摘要 |
Heat balance of a fractionation column is controlled and maintained by obtaining three differential temperatures between selected temperature-sensing points along the height of the column. Signals representing the three delta-T's are employed in regulating the quantity of reflux to the rectification zone and the enthalpy (heat-input content) of the reboiled liquid bottoms stream. With respect to the latter, two delta-T's, obtained below the feed locus are used. One of these is considered in conjunction with the third delta-T, obtained above the feed tray, and an additional signal representing the flow rate of the feed stream, to regulate the quantity of reflux.
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