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The required moisture removal is achieved by adjusting the rate of drum <br /> rotation (retention time) or the rate of fuel consumption (temperature) . <br /> The heat source is a directly connected firing chamber with two burners <br /> mounted opposite the rotary dryer. The primary burner fires blended fuel <br /> oil . A backup burner is included to fire propane if fuel oil pumps fail . <br /> The conveying and drying air are ducted out of the dryer and directed <br /> through a Cyclone and Baghouse via the Induced Air Fan. <br /> TABLE 2.2 <br /> TYPICAL BIOMASS PROPERTIES <br /> Anticipated <br /> Moisture High <br /> Content Heating Value <br /> Typical Biomass (Percent) (BTU/lb) <br /> Field Crops <br /> Corn stalks 30 7,589 <br /> Cotton stalks 30 7,851 <br /> Wheat straws 25 7,525 <br /> Rice straws 25 7,000 <br /> Orchard Prunings <br /> Almond prunings 30 8,604 <br /> Vineyard prunings 40 8,225 <br /> Wood Wastes <br /> Redwood 50 8,940 <br /> White fir 50 8,579 <br /> Oak 50 8,350 <br /> Food and Fiber Processing Wastes <br /> Almond shells 35 8,333 <br /> Peach pits 40 8,952 <br /> Note: This table is not an exhaustive list and is intended only to <br /> indicate the type of biomass wastes to be utilized as feedstock <br /> (Reese-Chambers Systems Consultants, Inc. 1988) . <br /> Secondary classification is by means of conveying the dried mate- <br /> rial into one of five separate Classifying Bins. Since reduction and <br /> drying are batch operations, each bin will contain biomass of certain <br /> 2-13 <br /> I01-46.R4 4/7/89 <br />