Computing the Processing Medium Temperature and Heat Fluxes in the Beginning of Regimes for Autoclave Steaming of Frozen Wood Materials

An approach for computing the processing medium temperature and heat fluxes in regimes for steaming in an autoclave of frozen wooden prisms at limited heat power of the steam generator, depending on the dimensions of the prisms cross section, wood moisture content, and loading level of the equipment has been suggested. The approach includes a use of two personal mathematical models: 2D model of the temperature change in the frozen wooden prisms and model of the nonstationary heat balance of autoclaves for steaming wood materials. Simultaneous numerical solving of the models was realized in Visual FORTRAN system developed by Microsoft. Computation and research of the change in the processing medium temperature and heat fluxes for warming up of the wood in an autoclave with industrial dimensions and loading level of 40, 50, and 60% at a limited heat power of the steam generator, equal to 500 kW during steaming in it of frozen beech prisms with different cross-section dimensions and moisture content have been carried out. The suggested approach can be applied for model based automatic control of the autoclave steaming process of different wood materials and species.