Lumber, its manufacture and distribution . Fig. 118.—A Standard Type of Horizontal Tubular Boiler with a Full-flush Grates. B. Fire Wall. C. Door to Smoke Chamber. D. Steam Pipe toMain Header. E, E. Clean-out Holes. F. Rear Arch. G. Blow-off Pipe. burns more or less throughout the mass. Sawdust, on the other hand,burns only on the surface and hence for a given grate surface coal orwood will produce more heat than sawdust Fig. 119.—A Dutch-oven Boiler Setting with Automatic Stoking Conveyor Trough from the Fuel House. C. Metallic Chute from theConveyor to the Furnac
Lumber, its manufacture and distribution . Fig. 118.—A Standard Type of Horizontal Tubular Boiler with a Full-flush Grates. B. Fire Wall. C. Door to Smoke Chamber. D. Steam Pipe toMain Header. E, E. Clean-out Holes. F. Rear Arch. G. Blow-off Pipe. burns more or less throughout the mass. Sawdust, on the other hand,burns only on the surface and hence for a given grate surface coal orwood will produce more heat than sawdust Fig. 119.—A Dutch-oven Boiler Setting with Automatic Stoking Conveyor Trough from the Fuel House. C. Metallic Chute from theConveyor to the Furnace. D. A Tilting Damper. A. Lever attached to aSlide by means of which the Flow of Wood Refuse into C may be stopped. The Dutch-oven type of boiler setting is in common use at sawmillplants where fine wood fuel is used, because it affords a larger com-bustion chamber than is practicable with the standard setting. Anotheradvantage of this type is that the furnace may be placed far enoughaway from the boiler heating surface so that the heat available for LARGE PLANTS 165 steaming purposes is from completely burned fuel. In a standardsetting, with the fire directly under the boiler shell, gases still in a stateof combustion strike the relatively cold heating surface of the boilerand this retards the combustion process and causes soot deposits. The grates used in the combustion chamber of sawmill boilers areof the fixed type, that
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
