F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
34/1, 34/50
F26B 5/04 (2006.01) F26B 23/00 (2006.01)
Patent
CA 1337785
In the vacuum drying of solid wood (2) and other wood-based products, the invention provides a method of achieving a better control of the drying process and a better heat economy than by the traditional me- thods of vacuum drying. This is achieved by complete- ly evacuating the air from the space around the wood (2), and instead to fill the space (1) around the wood (2) with superheated water vapours (11). By maintaining a uniform presssure and temperature in all parts of the drying chamber (1) during the drying process, and controlling the temperature and the pre- ssure of the superheated water vapours (11) in accor- dance with directives described in more detail, it is possible to control the dampness (MC) of the wood very precisely, and thereby to avoid damage to the wood (2) during drying. By at the same time providing the drying plant with a heat pump system (13) and condensing the water vapours (11) which have evapor- ated from the wood in a separate cooler condensation tank (15), it is possible with very low energy con- sumption to recover and re-use the main part of that thermal energy which is used in the drying. This is effected by using the wood (2) existing in the drying chamber (1) as a heat buffer, and controlling the temperature in the cooler condensation tank (15) and in the drying chamber (1) in accordance with more closely detailed directives.
548355
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Moldrup Steen Ole
LandOfFree
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