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Comment Processing & Handling

U.S. power plant goes dry for handling bottom ash

By Gerald Parkinson |

Practically all of the coal-fired power plants in the U.S. collect ash from the bottoms of their boilers using a wet system — the ash falls into hoppers that are partially filled with water, and once or twice per shift the slurry is pumped to a settling pond or solid-liquid separation tanks (dewatering bins). In a break from that norm, Seminole Electric Cooperative, Inc. is switching its two 650-MW units in Palatka, Fla., from a wet to a dry bottom ash system. The change is expected to increase boiler efficiency and reduce operation and maintenance costs in comparison with wet systems. Scheduled for startup during 2012, the project marks the first U.S. installation of a dry bottom ash system manufactured by Clyde Bergemann Delta Ducon (Malvern, Pa.; www.deltaducon.com), although in the last four years the company has installed over 30 systems in 16 plants and five countries elsewhere, mostly in Asia. Ron Grabowski, vice-president sales, says U.S. utilities are generally slower to make changes. However, he says the company has received a lot of inquiries recently because of pending Environmental Protection Agency (EPA; Washington, D.C.) proposals to regulate settling ponds. In the process, called Drycon, hot ash falls onto a dual…
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