New series of wood drying kiln
New series of wood drying kiln
New series of wood drying kiln
Accordingly, the present invention provides a wood drying kiln 8 for the drying of timber. The kiln 8 of the present invention includes an elongated housing to provide a timber treatment zone. The elongated housing is provided by a kiln base 9, a pair of kiln side walls 10, 11 and a kiln top wall 12 defining the timber treatment zone 13 therewithin as far as the lateral cross-section is concerned. A pair of kiln end walls 14, 15 complete the timber treatment zone 13.
In accordance with the invention the wood drying equipment side walls 10, 11 and kiln top wall 12 are so shaped as to provide in lateral cross-section a gas circulation passageway about said timber treatment zone. The gas circulation passageway includes a top passageway portion 16 extending over the top of the timber treatment zone, a side passageway portion 18 extending down one side of the timber treatment zone, a treatment passageway portion 19 extending through the timber treatment zone, and a side passageway portion 20 extending up the other side of the timber treatment zone to merge with the top passageway portion 16. Each of the kiln side walls 10,11 is sloped so that each of the side passageway portions is broader at the top and narrower at the bottom thereby uniformly to reduce the flow area of gases circulating within the gas circulation passageway, thus to maintain a substantially uniform velocity of gas at various levels within the timber treatment zone as will be further explained below. It will be seen then that gas within the gas circulation passageway may circulate through the top passageway portion 16 to a side passageway portion 18 through the treatment passageway portion 19 or timber treatment zone and return via the other side passageway portion 20 to the top passageway portion 16, the shape of the gas circulation passageway being such as to provide a substantially even rate of flow at various levels within the timber treatment zone.
Preferably the top passageway portion 16 merges with each of the side passageway portions 18, 20 to provide even flow, preferably by means of a rounded junction 21 between the kiln top wall 12 and each of the kiln side walls 10, 11.
The wood drying equipment structure of the present invention provides a gas circulation means preferably within the gas circulation passageway to maintain the circulation of treatment gas in the manner outlined above. Preferably, the gas circulation means is provided by one or more tube axial fans 22.
Preferably the tube axial fan 22 is reversible whereby the direction of circulation within the gas circulation passageway may be reversed.
Thewood drying kiln 8 of the present invention may also include one or more return ducts. Preferably a pair of return ducts 25, 26 are provided one extending along the lower edge of each side passageway portion. In the preferred embodiment, as above discussed, the preferred side passageway portions slope inwardly towards their bottom. Therefore, when the elongated housing is provided in rectangular cross-section there is on the bottom of each side a portion that may provide the return ducts as shown in FIG. 4 of the drawings. Preferably each return duct 25, 26 communicates with the side passageway portion 18, 20 respectively by a series of return nozzles or ports 28 spaced longitudinally therealong.
At one end of the wood drying equipment 8 there is preferably provided a heating means 29 to provide heated replenishment gas to the inlet duct 23. The heating means 29 may include a burner 30 such as an oil burner and a pressure burner block or the like, having a chamber 37 for combustion separated by baffles 31 from a cooling air inlet 32. In this way the hot combustion gases may be mixed with air to provide a controlled temperature for the gases entering the inlet duct.
The wood drying kiln 8 itself may be constructed of any suitable material. Preferably the kiln walls are constructed of a suitable metal such as a 16 gauge metal sheet, for example, and provided with insulation. The insulation employed is preferably mineral in nature although other known insulating material of appropriate heat resistance may be used if desired. In one form of construction that has been found suitable, the kiln is provided with external insulation comprising an aluminium clad fibreglass blanket attached to the exterior of the kiln. Preferably, the kiln is constructed of a number of individual modules in lateral cross-section. In this way any suitable number of individual modules may be placed end to end to provide a kiln of desired length for the timber to be treated. For example, in one suitable arrangement, ten modules placed face to face to provide a total wood drying equipment has been found satisfactory. Preferably each module includes a separate tube axial fan of the type above indicated and each providing an inlet and a return port for access to the inlet duct and return duct respectfully. Further details of the modular construction will be apparent from a study of the drawings annexed hereto.
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