Research on the Simultaneous Steaming in an Autoclave of Non-Frozen Beech Prisms with Different Thicknesses Intended for Production of Veneer
- Journal Article
An approach to mathematical modeling and research on the 2D non-stationary temperature distribution in non-frozen wooden prisms with different thicknesses during their simultaneous autoclave steaming at limited heat power of the steam generator and during the subsequent air conditioning before the cutting of veneer is described in the paper. Mathematical descriptions of the changing processing medium temperature in an autoclave and near the steamed prisms out of the autoclave were introduced as boundary conditions in our own 2D non-linear mathematical model of the 2D temperature distribution in non-frozen prisms during their heating and cooling. Numerical solutions of the model in the calculation environment of Visual FORTRAN Professional are given as an application of the suggested approach. Simulative investigation of 2D non-stationary temperature distribution in non-frozen beech (Fagus Sylvatica L.) prisms with an initial temperature of 0 degrees C, cross-section dimensions of 0.3 x 0.3 m, 0.4 x 0.4 m, and 0.5 x 0.5 m, moisture content of 0.4, 0.6, and 0.8 kg.kg(-1), during their autoclave steaming and subsequent conditioning was carried out. The simultaneous steaming of all prisms was simulated according to regimes for prisms with cross-section dimensions of 0.5 x 0.5 m in an autoclave with a diameter of 2.4 m, length of 9.0 m and loading levels of 40, 50, and 60% at a limited heat power of the steam generator, equal to 500 kW. It was found that good quality veneer could be obtained after simultaneous steaming of prisms of the same wood species with differences between their thicknesses up to 100 mm. It is necessary to carry out the steaming according to the regime that applies to the prisms with the largest thickness in a given batch. Then the effect of the wood moisture content and loading level of the autoclave on the plasticization degree of the prisms and the veneer quality is practically negligible. The suggested approach can be used for the computation and model based automatic realization of energy-efficient optimized regimes for autoclave steaming of different wood materials. Show more
Journal / seriesACTA FACULTATIS XYLOLOGIAE ZVOLEN
Pages / Article No.
PublisherTechnická univerzita vo Zvolene
Subjectsimultaneous steaming in autoclave; beech prisms; thickness of prisms; moisture content; loading level of autoclave
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