Wash Oil Control:Inferred Versus Measured Rates

Source: AIChE
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  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    August 18, 2020
  • Duration:
    25 minutes
  • Skill Level:
    Intermediate
  • PDHs:
    0.50

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Crude oil distillation towers use a wash section to remove entrainment from the feed. This section requires wash (wetting) liquid to maximize performance and prevent the wash section from coking. This is a difficult control problem. The liquid rate has a sharp optimum. Too low a rate, and the wash section cokes, shutting down the unit. Too high a rate and significant yield or capacity losses can result. Being wrong in either direction has a high cost.

The liquid rate can be controlled by either direct measurement and control or by inferring a rate based on energy and mass balance around the unit and controlling a secondary stream. The direct measurement system has higher capital and operating costs. The indirect method has lower capital and operating costs, but has a higher risk of upsets and larger uncertainties.

This presentation reviews the results of Monte Carlo modeling of a crude unit to evaluate the economic benefits of the direct approach versus the uncertainties in the indirect approach.

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Checkout

Checkout

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Individuals

AIChE Member Credits 0.5
AIChE Members $19.00
AIChE Graduate Student Members Free
AIChE Undergraduate Student Members Free
Non-Members $29.00
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