By Neal R. Hood, maintenance specialist, and Kristi Simmons, air and gas engineer, Alabama Power Company
Plant engineers at Alabama Power decided to upgrade damper drives for each of two coal-fired units at the James H. Miller, Jr. Electric Generating Plant. The two units, similar in design and having 25 years or more of service, each have a 720 megawatt capacity. High maintenance levels for the original Bailey drives, along with a growing scarcity of parts, provided the economic justification for replacing 45 damper drives for each boiler.
Geothermal energy sources have many advantages. They are completely renewable, requiring only naturally present water and heat, which is continuously generated from moderate volcanic activity from the earth's core.