Patent Number: 8,579,999

Title: Method of enhancing the quality of high-moisture materials using system heat sources

Abstract: The present invention harvests and utilizes fluidized bed drying technology and waste heat streams augmented by other available heat sources to dry feedstock or fuel. This method is useful in many industries, including coal-fired power plants. Coal is dried using the present invention before it goes to coal pulverizers and on to the furnace/boiler arrangement. Coal can be intercepted on current coal feed systems ahead of the pulverizers. Drying fuel, such as coal, is done to improve boiler efficiency and reduce emissions. A two-stage bed utilized in the process first "pre-dries and separates" the feed stream into desirable and undesirable feedstock. Then, it incrementally dries and segregates fluidizable and non-fluidizable material from the product stream. This is all completed in a low-temperature, open-air system. Elevation of fan room air temperature is also accomplished using waste heat, thereby making available to the plant system higher temperature media to enhance the feedstock drying process.

Inventors: Bullinger; Charles W. (Bismarck, ND), Ness; Mark A. (Underwood, ND), Sarunac; Nenad (Easton, PA), Levy; Edward K. (Bethlehem, PA), Weinstein; Richard S. (Bismarck, ND), James; Dennis R. (Bismarck, ND)

Assignee: Great River Energy

International Classification: C10L 5/00 (20060101)

Expiration Date: 2022-11-12 0:00:00