F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
F26B 21/08 (2006.01) F26B 21/10 (2006.01) F26B 25/22 (2006.01) G05B 15/02 (2006.01)
Patent
CA 2063917
(57) Abstract The invention concerns a method for control of the operation of a lumber-drying plant, in particular of a chamber dryer (10). In the method the tempera- ture (T) and the humidity (Rh) of the air passing through the lumber batch (K1,K2,K3) to be dried are controlled as the drying process makes progress. The progress of the drying process is regulated by means of a feedback-connected drying-formula simu- lator (23), by whose means the drying process is given new set values (S) continuously or at suitable intervals. Out of the drying process, measurement data (m) are passed to the drying-formula simulator (23), the drying process model stored in said simula- tor being adapted to the state of the drying process on the basis of said measurement data (m). In the method, an adaptive process model is applied, in which a certain parameter or certain parameters are allowed to remain variables, which is/are adapted in the correct direction on the basis of the measurement data (Rh,TK,u) received from the process.
Gowling Lafleur Henderson Llp
Valmet-Utec Oy
LandOfFree
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