Wash Oil Control:Inferred Versus Measured Rates
Source: AIChE

- 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
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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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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