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Lignite drying-and-refining system formally dedicated

By Gerald Ondrey |

Last month, Great River Energy (Maple Grove, Minn.; www.greatriverenergy.com) dedicated its patented DryFining coal enhancement system at its power-generating plant, Coal Creek Station, N.D. The system, developed by Great River Energy, uses waste heat to reduce the moisture level of low-rank coal, such as lignite, from 38.5% to 29%, which boosts heating value of the coal from 6,250 Btu/lb to 7,100 Btu/lb. As a result, the overall efficiency of the plant increases by 2–4%, says the company. In addition, the refining component of DryFining segregates the lignite stream and removes the higher density compounds that contain higher levels of sulfur and mercury. As a result, emissions are also reduced, namely, SO2 and Hg by more than 40%, NOx by more than 20% and CO2 by 4%. The process has been developed through a number of DOE grants, starting in 2003, which culminated in the startup of a commercial system (four units, each processing 135 ton/h of coal) at Coal Creek Station, which started up last December. The DryFining system will be licensed through a partnership with WorleyParsons (Sydney, Australia; www.worleyparsons.com).   Click here for a full pdf version of the Chementator Section
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