| 摘要 |
A recirculating furnace-dryer combination including a combustion chamber, a housing surrounding the combustion chamber for maintaining a greater than atmospheric pressure within the combustion chamber, a dryer in which a greater than atmospheric pressure may be maintained, and a feed conduit through which heated gases may be supplied from the combustion chamber to the dryer. Return conduits receive exhaust gases from the veneer dryer and recirculate them through a fan for repressurization into the housing, from which they are recirculated into the combustion chamber. A fuel feed, including an air lock, is operable to feed fuel into the combustion chamber, with an air lock maintaining a pressurized condition in the combustion chamber. Temperature sensing devices in the dryer are connected to controls to operate dampers in the feed conduits to maintain a preselected temperature range within the veneer dryer. A pressure sensing device in the combustion chamber senses changes in pressure in the combustion chamber to actuate automatic controls for controlling the rate of feed of fuel to the combustion chamber and the rate of entry of recirculated dryer gases and atmospheric air into the combustion chamber as necessary to maintain a balanced pressurized operating condition.
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