Lumber, its manufacture and distribution . ven unit. In many cases, the area of grate surface is insufficientto permit the requisite consumption of sawdust fuel, or the stack isnot large enough to insure an adequate .draft, or an attempt is madeto secure more power from the boilers than they were designed to pro-duce. Most mills that install forced draft do so from necessityrather than from choice. Forced draft is in more common use in mills cutting hardwoods thanin those cutting softwoods because wet hardwood sawdust does notburn readily and often there is no dry planing mill refuse which can
Lumber, its manufacture and distribution . ven unit. In many cases, the area of grate surface is insufficientto permit the requisite consumption of sawdust fuel, or the stack isnot large enough to insure an adequate .draft, or an attempt is madeto secure more power from the boilers than they were designed to pro-duce. Most mills that install forced draft do so from necessityrather than from choice. Forced draft is in more common use in mills cutting hardwoods thanin those cutting softwoods because wet hardwood sawdust does notburn readily and often there is no dry planing mill refuse which can bemixed with the fuel. Another reason for their use at some plants isthat it is cheaper to put in forced draft than it is to build a chimneyor stack of the size required for natural draft. Forced draft permitsthe use of a smaller chimney or stack and a reduced grate area becausethe air can be forced through the grate at a higher velocity than isattainable with natural draft. The equipment comprises some form of blower fan which furnishes. 166 THE SAWMILL POWER PLANT
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
