Developments in vacuum drying and press drying of
Developments in vacuum drying and press drying of
Developments in vacuum drying and press drying of
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Center for<br />
Forest Products<br />
Pr<strong>of</strong>. Dr. Ressel<br />
Introduction<br />
Fundamentals<br />
Plant Facilities<br />
Innovations<br />
Process<br />
Technology<br />
Plant Examples<br />
Brunner<br />
IWT<br />
Mühlböck<br />
Kronseder<br />
Eberl<br />
Opel<br />
HeatWave<br />
Press Dry<strong>in</strong>g<br />
����������� � �� ����<br />
Vacuum Dry<strong>in</strong>g Plants - Brunner<br />
Superheated steam <strong>vacuum</strong> dry kilns<br />
BRUNNER<br />
Brunner Trockentechnik<br />
Investment costs [1000 Euro]<br />
500<br />
Vacuum dry kilns (high-low)<br />
Conventional dry kilns (high-low)<br />
400<br />
(gross capacity 95...140 m³)<br />
300<br />
200<br />
100<br />
0<br />
1992 1997 2000<br />
Decl<strong>in</strong>e <strong>of</strong> <strong>in</strong>vestment costs superheated<br />
steam <strong>vacuum</strong> - heat-<strong>and</strong>-vent kiln dry<strong>in</strong>g<br />
dur<strong>in</strong>g the past decade (Brunner, 1999)<br />
90<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
European White Oak<br />
Total dry<strong>in</strong>g time down to mc f<strong>in</strong>al = 8 %<br />
High VAC ® - Superheated Steam -Vacuum<br />
Heat-<strong>and</strong>-Vent (Conventional kiln Dry<strong>in</strong>g)<br />
SH / V<br />
Heat-<strong>and</strong>-Vent<br />
0 10 20 30 40 50 60 70 80 90 100<br />
Total dry<strong>in</strong>g time [d]
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