Page 161 - Process simulation and control using Aspen

148 PROCESS SIMULATION AND CONTROL USING ASPEN

Select the plot type under the heading of Temp and press Finish button to obtain a
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plot of Temperature (0F) vs. 'Stage' (see Figure 3.60).

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FIGURE 3.60
Recall that the above plot window can be edited by right clicking on that window
and selecting Properties. Then the user can easily modify the title, axis scale, font and
colour of the plot.

3 .3 .2 Simulation of a PetroFrac Model

Problem statement
An artificial petroleum refining column (PRC), shown in Figure 3.61, consists of a feed
furnace and a distillation tower. The tower has two pumparound circuits, a partial
condenser and three side strippers. The furnace (single stage flash type) operates at
25 psia and provides a fractional overflash of 40% (StdVol basis) in the tower. The
outlet stream of the furnace goes to the tower on Stage 22. The tower has 26 stages
f
f
with a Murphree stage eiciency equal to 90%. A steam stream, STEAM, is introduced
at the bottom of the fractionator (26th stage with on-stage convention). There are another
three steam streams, STM1, STM2 and STM3, used in the side strippers. The condenser
runs at 15.7 psia with a pressure drop of 5 psi. The tower pressure drop is equal to
4 psi. The distillate rate is 10000 bbl/day and the distillate vapour fraction in the
condenser is 0.2 (StdVol basis).

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