Characterization and indirect control of solids transfer loops
A cold-flow, circulating fluid bed unit has been operated to test advanced control strategies. The riser is one foot diameter and 50 foot tall and consists of metal and acrylic spool pieces for mechanical support and visual observation. The unit was run with 10--20 ft/s in the riser at ambient pressure using 250 micron polyvinyl chloride particle. The hydrodynamics of each component leg in the Circulating Fluid Bed (CFB) must be characterized to facilitate control of the integrated circulating loop. The CFB is composed of the transport riser lift line, cyclone particle gas separator, dense bed downcomer or standpipe, and non-mechanical valve to recycle solids to the riser. The primary control elements of a fluid bed are located in the fluidizing gas streams. The processes of solids transfer through each leg result in highly non-linear, coupled process variables. Dynamic simulations suggest hydrodynamic mechanisms to be experimentally characterized. Both open-loop and closed loop control analysis techniques are demonstrated which characterize both the component, as well as the integrated loop. The process variables are defined and their dependencies are characterized. Experimental and analytical techniques for exhibiting these dependencies within each component are illustrated. Control techniques for uncoupling process variables around the loop are demonstrated. Adaptive control techniques are proposed to assure robust, optimum performance.
- Research Organization:
- Dept. of Energy, Morgantown, WV (US)
- OSTI ID:
- 20006782
- Report Number(s):
- CONF-990534-; TRN: IM200008%%389
- Resource Relation:
- Conference: 15th International Conference on Fluidized Bed Combustion, Savannah, GA (US), 05/16/1999--05/19/1999; Other Information: 1 CD-ROM. Operating system required: Windows 3.x; Windows 95/98/NT; Macintosh, Power Macintosh; UNIX. All systems need 2X CD-ROM drive.; PBD: 1999; Related Information: In: Proceedings of the 15th national conference on fluidized bed combustion, by Reuther, R.B. [ed.], [1800] pages.
- Country of Publication:
- United States
- Language:
- English
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