79) Similar Crude Mix to Multiple Towers
Summary
If the single crude can be kept separate and routed this way, fine, but if operating options are more constrained and such specificity cannot be achieved, the model is over-optimizing. The “?” will be expanded for each active crude so that you have a whole set of controls (In g5 the “?” can be in any position, but H/Planet is going to expect them at the end – and anyway it makes it easier to read the resulting codes). The method works best in aligning the mixtures if all the crudes have the same split, so I made WTX different only to show that this is possible. The controls do force a minimum flow on each tower, so it is possible that they will lead to under-optimization if margins are poor and capacity is not worth utilizing. If the crude can also go to storage then you would need to control the mix to the last tower as well It’s a good thing to have a reminder now and again that you actually do some quite useful stuff with linear equations – just because we can optimize non-linear formulations that doesn’t mean we always have to use them!
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