The application of wood drying kiln
已有 140 次阅读 2012-08-11 15:07The application of wood drying kiln
It is known that by controlling the temperature and humidity within the
interior of a hardwood kiln, lumber positioned within the kiln may be dried at a
controlled rate to minimize drying related defects of the lumber as it is dried.
In order to control the wood drying kiln temperature and humidity, a sample
piece of lumber is selected from the lumber being dried, and the moisture
content of the sample is determined outside the kiln, at preselected intervals
of time. With the moisture content information, the kiln temperature and
humidity are altered, if necessary, to ensure that the lumber is dried at the
desired rate.
Such a process is time-consuming, is susceptible to error in
calculating the moisture content, is likely to effect the environment of the
kiln interior as the kiln interior is exposed to ambient conditions during
removal of the sample from the kiln and is uncomfortable and potentially
dangerous in that the operator must enter the hot kiln. In addition, the sample
used to monitor the moisture content is re-positioned within the bulk of the
lumber situated within the kiln following each moisture-determining operation.
Such a re-positioning of the sample renders it inaccessible for unhindered
visual inspection.
A monitoring system for a wood drying kiln having a
housing with an interior wall surface, an area within the housing for placement
of a charge of wood for drying of the charge of wood, and means for heating and
humidifying the interior of the kiln, the monitoring system comprising: support
means positioned adjacent the interior wall surface for supporting a
representative sample of the charge of wood adjacent the interior wall surface
and remote from the charge of wood; sensor means operatively connected to the
support means for sensing a physical characteristic of the sample which is a
function of moisture content in the sample; signal generation means operatively
connected to the sensor means for generating a signal corresponding to moisture
content of the sample as a function of the physical characteristic; control
means operatively connected to the means for heating and humidifying the
interior of the kiln and to the signal generation means for controlling the heat
and humidity within the kiln in response to the signal received from the signal
generation means;
There are problems with existing wood drying kilns dealing
chiefly with the circulation of heated air through the drying chamber. There is
a tendency for the heated air being directed across the lumber to be unevenly
distributed leading to over drying and resultant distortion and even charring of
the lumber in some locations and under drying of the lumber in other locations.
This problem is also due to inadequate mixing of the heated air with
recirculated air which can result in a definite temperature variance across the
airstream being blown through the stacked lumber which leads to uneven wood
drying kiln.
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