The analysis on use in production cycle of wood raw reprocessing of mobile press and vacuum drying tunnels in comparison with traditional drying tunnels as environmentally friendly in operation and production of cameras, with high quality of drying to final humidity of 2 - 6% is carried out.
The researches conducted in MSUW (Moscow State University of the Wood) have shown that the highest quality, both drying process, and the material (wood products) press and vacuum drying tunnels in which technological process, the improved principle of drying which cornerstone property of low - temperature evaporation of water is with the lowered pressure is used provide.
In difference from convective and aerodynamic cameras in which material is laid through laying and movement of moisture comes from the center of board to its surface, punching annual growth rings, doing sawn timber friable. In press vacuum chambers, material keeps within closely on flat heating elements and movement of moisture happens along fibers longwise of sawn timber due to exhaustion in the camera and contact heating. Atmospheric pressure through rubber diaphragm of cover, presses sawn timber to flat heaters, good thermal contact with the heat carrier thereby is provided. Sawn timber turns out equal, more dense and resistant to moisture penetration.
The moisture emitted from wood is condensed and gathers in the liquid state in separate tanks for the subsequent application. There is opportunity receiving termomodefitsirovanny wood.
ADVANTAGES OF CAMERAS PVSK.
|Key parameters||CAMERA PVSK - 6,
|CAMERA SKV - 50|
|1. Camera volume material ratio||99%||60%|
|2. Maximum volume of loading of the camera of type||5.8 cube||27 cbm.|
|3. Quantity of sushka in month||15||3|
|4. Time for carrying out one drying||32 hours||192 hours|
|5. Achievable final humidity||2 - 6%||8 - 10%|
|6. Time of receiving thermowood||28 + 8||No|
|7. Maximum power consumption||36 kW||202 kW|
|8. Electric power expense on drying of 1 cubic meter||80 - 280 kW||480 kW General.|
|9. Heaters 100 uh/C||Electric heaters of 3000х1450х7 mm - 24 pieces.||Water, steam|
|10. Mode of manual and automatic control||1 operator||is|
|11. Main programs of drying||5||20|
|12. Alignment of wood due to press effect||Is||No|
|13. Lack of emission in the atmosphere of heat and steam||Is||Is|
|14. Practically there are no defects. Efficiency||99%||80%|
|15. Category of quality of drying||1,2,||1,2,3,4|
|16. Payback||8 - 12 months.||1.5 - 2 years|
|17. Subsequent use of "wringing" as SOZH||Is||No|
|18. Weight||1.8 tons||9.0 tone|
|19. Cost||1 625 000||1 050 000|
|20. Possibility of drying of exotic breeds of wood||Is||No|
In technical and qualitative parameters, the mobile press vacuum drying tunnel exceeds cameras of traditional way of converted timber drying and belongs to the environmentally friendly equipment of the European quality.