Lumber, its manufacture and distribution . in recentyears, and are regarded as more effective steam producers than the hori-zontal tubular type. There are two types of boiler settings known as the standard !and the The fire box in the first type is placeddirectly under the boiler shell or tubes, while in the Dutch-oven typean extension front is built which gives a larger fire-box and providesbetter combustion with wood fuel. The standard type may have either a half-arch, three-quarter arch, or a full-arch front. In the half-arch and the three-quarterarch type, the smoke box projec
Lumber, its manufacture and distribution . in recentyears, and are regarded as more effective steam producers than the hori-zontal tubular type. There are two types of boiler settings known as the standard !and the The fire box in the first type is placeddirectly under the boiler shell or tubes, while in the Dutch-oven typean extension front is built which gives a larger fire-box and providesbetter combustion with wood fuel. The standard type may have either a half-arch, three-quarter arch, or a full-arch front. In the half-arch and the three-quarterarch type, the smoke box projects beyond the boiler front, whereas inthe full-arch type the end of the smoke box is enclosed by the boilerfront. When the standard setting is used at plants burning sawdustfor fuel, a larger grate surface must be provided than would be necessaryi See Fig. 118. 2 See Fig. 119. 164 THE SAWMILL POWER PLANT with coal or wood fuel. There is a burning surface greater than thegrate area when fuels such as coal and wood are used because the fire. 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 fuel.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
