Lumber, its manufacture and distribution . ple offorced air circulation and humidity control by means of water spraj^s,which saturate the air and deliver it beneath the heating pipes at anytemperature desired. A cross-sectional elevation of a typical kiln of this type is shown onFig. 143. The spray chambers on the sides of the kiln are 6 or 7 feetin height, from 12 to 16 inches in width, and extend the entire lengthof the kiln. The top of the spray chamber is open and may have a run-way above it. The bottom forms a gutter which drains to the end ofthe kiln and thence to a well. The sides of th
Lumber, its manufacture and distribution . ple offorced air circulation and humidity control by means of water spraj^s,which saturate the air and deliver it beneath the heating pipes at anytemperature desired. A cross-sectional elevation of a typical kiln of this type is shown onFig. 143. The spray chambers on the sides of the kiln are 6 or 7 feetin height, from 12 to 16 inches in width, and extend the entire lengthof the kiln. The top of the spray chamber is open and may have a run-way above it. The bottom forms a gutter which drains to the end ofthe kiln and thence to a well. The sides of the chambers are thoroughlywaterproofed. The series of sprays which saturate the air is near thetops of the chambers. The air passes down the chamber, thence through DRY-KILN SEASONING 233 the baffles which separate the fine mist from the air, but allow the airto pass through in a saturated condition. These baffle plates are madeof boards, which must fit tightly, since any leakage to the steam-pipechamber would destroy the humidity From Bulletin 894 U- S. Department of Agriculture. Fig. 143.—A Cross-section of a Tiemann Humidity Water-spray Dry Kiln. The floor under the trucks serves to prevent the hot air from theheating coils striking directly on the lower courses of boards. Thefloor also serves as a runway. The method of piling recommended is shown in the figure, a flue 12inches or more wide being left in the center. Canvas curtains arehung from the ceiling to the edge of the piles to prevent the air circula-tion from being short circuited. 234 SEASONING LUMBER Condensing pipes are placed above the sprays for use at the endof the drying operation when a reduced rate of air circulation sprays also are placed beneath the lumber piles for removingcase-hardening. A few steam pipes may be placed along the ceilingto keep the temperature slightly above the dew point of the air, sothat condensation on the ceiling will not take place and the water dripdown on
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
