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wood drying kiln
As is conventional, a series of pivotable flaps 40 and hinged plates 42 are provided to position against the stacks of lumber to prevent air flow from travelling beneath the rail cars and short circuiting across the very top of the lumber stacks. A return air duct 9 is provided between the interior of the wood drying kiln chamber and the gas burner unit to permit partial recirculation of the heated air through duct system 24. A portion of the heated air is also recirculated through the interior of the wood drying kiln chamber. Return air duct 9 is also provided with a fresh air intake 11 that has a variable aperture to control the amount of fresh air introduced and mixed into the heated air stream exiting from the wood drying kiln chamber. Otherwise, fresh air is introduced into the air stream by air drawn through burner unit 8 and not involved in the combustion of the gas. Stack 45 is provided in the roof of the kiln to permit escape of air from the wood drying kiln chamber interior if the chamber internal pressure becomes too great.
Referring to FIG. 3, there is shown an alternative fan and duct arrangement. In this case, fans 26 are mounted for swivelable movement about a vertical axis parallel to the plane of rotation of the fan blades. The fans are rotated about their axis at periodic intervals to reverse the circulation of the air flow in the wood drying kiln chamber. Periodic reversal of air flow direction tends to result in more uniform wood drying kiln of the stacked lumber. Reversal of the air flow direction makes it necessary that duct system 24 comprise a pair of separate ducts 55 and 56 extending substantially the length of the wood drying kiln chamber and each formed with a slot vent 50 that opens toward opposite sides of the wood drying kiln chamber so that heated air can always be directed to the low pressure side of the fans. Since the fan blades always rotate in the same direction, they are preferably airfoil shaped for most efficient delivery of air.
Fans 26 are present to generate air flow through the wood drying kiln chamber. Fans 26 and hot air duct system 24 are situated in an enclosed region 34 above the wood drying kiln chamber that communicates with the wood drying kiln chamber through slots 36 that extend the length of the wood drying kiln chamber. Enclosed region 34 is formed with an insulated domed upper surface 38 to assist in smoothly directing air flow into the wood drying kiln chamber.
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As is conventional, a series of pivotable flaps 40 and hinged plates 42 are provided to position against the stacks of lumber to prevent air flow from travelling beneath the rail cars and short circuiting across the very top of the lumber stacks. A return air duct 9 is provided between the interior of the wood drying kiln chamber and the gas burner unit to permit partial recirculation of the heated air through duct system 24.