Aspen Touch Solutions ATM-123R Series Specifikace Strana 369

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Customization FAQ A-33
A-33
A.2.3 Kinetic Reaction
Extensions
1. What is the Container for a Kinetic Reaction Extension?
Ans: The ExtnKineticReactionContainer is the Container
object for Kinetic Reaction Extensions. It contains the
properties and methods which are available to them. You can
view this object with an object browser (such as is contained
in Visual Basic) or you can read the extension help file
(xhysys.hlp) which is installed in the HYSYS directory when
the extension SDK is installed.
2. Why is the Triggers Solve checkbox greyed out in the
Objects Manager in the EDF?
Ans: For Kinetic Reaction Extensions, the Triggers Solve
checkbox must always selected, which is why it is disabled
(greyed out).
3. How do I access the liquid phase if my reaction only occurs
in the vapour phase? If I select combined phase, then my
reaction rate changes.
Ans: HYSYS multiplies the reaction rate, which you pass to
it, by the volume of the phase selected. This is wherein the
problem lies as HYSYS should actually only use the volume
of the Liquid Phase instead of the volume of the Combined
Phase. Here is the workaround:
The corrected rate will now be used by HYSYS.
Code Description
hyContainer.Phase = ptCombinedPhase
Set the Phase property to
ptCombinedPhase.
Temp = Fluid.HeavyLiquidPhase.MolarDensityValue
Access the Liquid phase for your
rate calculations (make sure to
identify it as
HeavyLiquidPhase or
LightLiquidPhase).
rate = rate * (1 - Fluid.VapourFractionValue)
Multiply the rate you calculate
by (1 -
Fluid.VapourFractionValue)
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