Quality Control is currently realized by online analyzers and regular lab analyses. Yet online analyzers are expensive, often not available, and costly in maintenance, while lab samples are time-consuming and are frequently taken at a 4-hour interval, which is too long for closed loop quality control. A better alternative is soft sensor technology, which allows you to estimate product quality parameters in real time, so that you can start controlling quality in closed loop. This technology gives the plant operator and the control system the possibility to react faster to disturbances and keep product quality in-spec.
Soft sensors give you an estimate of parameters (such as these below) every
second, and allow you to control them in real time:
- Polymer densities
- Polymer melt indexes
- Viscosity parameters
- Concentrations of products at the outlet of a reactor, distillation column or blender
- Color parameters
- Exhaust concentrations (NOx, CO2, dioxines, opacity, etc.)
- Very large flows (e.g. cooling water of a large power plant)
- Plant efficiency.
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