February 2001

Special Report: Clean Fuels

Improve APC uptime using analyzers with predictive models

This hybrid approach reduced payback time by about 10%

Brooks, K. S., Dreyer, R., Honeywell Hi-Spec Solutions; Burston, A., Sasol Technology

As part of an advanced process control (APC) scheme, online analyzers may help you operate against your specification and so maximize profit. But what do you do when your analyzer misbehaves? Must you then operate conservatively and lose out on yield? As part of an APC project on a vacuum distillation unit (VDU), we addressed this problem. The unit has an analyzer for the waxy oil product viscosity. This viscosity must be kept below a certain limit. We have increased reliability of the viscosity value by providing a prediction as a back-up for the times the analyzer is not giving a valid reading. The net result is increased online time for the APC scheme and increased un

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