Vacuum furnaces


Advantages of vacuum drying

-Lower operating temperature
-Shorter drying times
-Lower energy consumption
-Better moisture distribution
-Return of initial investment in short period



Application of vacuum drying

-Drying of wood
-Drying of grindstone
-Drying of other materials


Operating principle of vacuum drying

Vacuum drying is based on physical effect of changing boiling boint of water (and other fluids and gases)
depending of pressure. As an example it is well known that it is easier to boil water at high alttitues than at lowland (as a consequence of pressure drop).
By achieving low enough pressure it is possible to dry at room temperature.

Technical characteristics of presented drier

1) Useful dimensions ( crucible ) :                                                
                        - diameter  1100 mm
                        - length       3000 mm

2) Useful dimensions (  each of three loading "baskets" )                                   
                       - length      900 mm
                       - width        900 mm
                       - height       500 mm

3) Power of heating during phase without vacuum
                       -  24 kW

4) Power of heating during phase with vacuum
                       -    4.5 kW

5) Vacuum pump                                                                     
                       - power                      4 kW
                       - flow                          max 200 m3 / h
                       - max.                        4 l of water / h
                       - deepest vacuum    0,1 mBar

6) Method of material manipulation
                       - double cart



Control

       Control is based on siemens PLC
       Advanced algorithm of regulation
               -continuous regulation of pressure and temperature
               -fast optimizing of work parameters
               -simple user interface

Regulation algorithm is our own solution



Other applications of vacuum furnaces:
       
       -freeze drying
       drying of material which is frozen during process,
       drying is direct phase change from solid phase to gas phase
       
       -heat treatment under protective atmosphere
       furnace atmosphere is completely exchanged with protective gas
       (protective gas consumption is lower compered to classic processes and quality is higher)

       -casting and welding
       special processes of casting and welding are enabled:
               - without air (prevents oxidation)
               - brazing of ceramics and metals