Process optimization aims for closed-loop control
This article describes how developers of powerful process-optimization software packages seek full integration with the distributed control system and real-time cost minimization of the entire plant. Optimizing operations has always been a fundamental objective at powerplants. Now, several software packages are emerging to help do the job. They are already being applied, with impressive results reported, in narrower functions, including: (1) reducing NO{sub x} emissions with minimum sacrifice in boiler performance; (2) indicating stack emissions, optimizing emissions among units, and, in some cases, avoiding continuous emissions monitoring (CEM) systems; and (3) optimizing emissions control processes themselves--such as flue-gas desulfurization (FGD) and urea and ammonia injection systems for NO{sub x} control. Today, software packages using various process-optimizing techniques, serve as off-line advisors to operators about plant conditions. One reason such software is not used in closed-loop mode is that virtually all plant distributed control systems (DCS) now operating were not originally designed to support the intense numerical analysis performed by optimization software. But DCS suppliers are taking their cue: their latest offerings include the capability to run optimization software; soon, DCSs may even be supplied with such software already integrated. Next step, say software developers, is to achieve true closed-loop control by having intelligent controllers automatically accept and respond to new setpoint adjustments recommended by the software.
- OSTI ID:
- 215445
- Journal Information:
- Power (New York), Journal Name: Power (New York) Journal Issue: 2 Vol. 140; ISSN 0032-5929; ISSN POWEAD
- Country of Publication:
- United States
- Language:
- English
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