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It is to ensure each operation that often controls destilling tower can maintain in formulary limits, whole system will use 3 many variable to forecast control its, the process capability that orders one class equipment with the quality that will be aimed at a product respectively, cut has effective control, also be to can get the processing result of beautiful.
In whole system, besides often pressing furnace to always be worth into makings quantity set is classics alloter hind, send 4 flow control that often press furnace implement outside the set that serves as them, the others manipulated variable sends corresponding controller to regard set as the value directly. The controlled variable that produces character to measure controller and process capability controller among them number is little at manipulated variable several, but most time controlled variable can change inside tie limits, because this need not be controlled. Below the premise that optimizes a target in implementation, product quality controller is equivalent to dot of heat up in a steamer, flash point is in first the floor level controller below tie condition; And the upper limit controller that process capability controller is equivalent to ability of equipment of atmospheric tower treating capacity restraining. Opposite for, the change that set of controlled variable of cut dot controller is worth compares stability relatively, its measured value wraps computation to obtain by software of real time craft, accordingly, can change as what manufacture technology and change.