Time (hours)

Figure 8.10a shows how pressure responds to the three disturbances with the three control structures. Figure 8.10b shows the responses in the distillate flowrate. Figure 8.10c gives the responses in stage 8 temperatures.

These results illustrate the important conclusion that control structure CS3 provides smaller and more gradual changes in the vapor distillate flowrate, which would be desirable from a plantwide control perspective if this stream were fed to a downstream process.

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