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Visit Emerson at PowerGen |
Tuesday, December 2, 2008
Multi-Unit Scrubbers and Digital Bus Technologies When the Progress Energy Roxboro Plant was tasked with improving emissions controls in 2002, it was one of the first plants in North America to make extensive use of digital bus technologies to control the Flue Gas Desulfurization (FGD) process. The Roxboro Power Plant is a four unit, 2425 megawatt coal fired plant. Both FOUNDATION™ Fieldbus (FF) and DeviceNet™ (DN) digital bus technologies are employed extensively throughout the FGD system. Currently, 285 FOUNDATION Fieldbus devices are installed including: valve positioners, level transmitters, pressure transmitters, pH transmitters, temperature transmitters, magnetic flow meters, and density meters. At this site, there are also a total of 619 DeviceNet devices used including: StoneL Output Modules, Turck Input Modules, Robicon VFDs, and ASCO On/Off Valve Position Indicators. This presentation will follow a large bus technology project from concept to commissioning. A review the goals established for the project, the controversy surrounding bus technologies, the bus selection criteria, design tradeoffs and implementation challenges will also be provided. An investigation of how design decisions and implementation affect reliability, cost, and maintenance will be provided. The presentation will conclude with a walk-through of the commissioning process to demonstrate how to develop debugging techniques, document lessons learned, and compare the final results to initial objectives.
Thomas Toms Rob Gilbert Jaime Foose
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