Digester
Level detection and pressure measurement in the digester
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Process data
Measuring task:
Point level detection and pressure measurement
Measuring point:
Digester
Measuring range up to:
8 m
Medium:
Wood chips in cooking liquor
Process temperature:
+160 … +170 °C
Process pressure:
+6 … +8 bar
Special challenges:
Insulated vessel
Application
In the digester, the action of chemical dissolution removes the lignin binder, thereby exposing and freeing the cellulose fibres. During the cooking process according to the alkaline sulphate method, the fibres are fed into the digester by means of steam pressure. To enable fully automatic operation of the digester, a point level detection of the filling is required. The vessel pressure also needs to be carefully monitored throughout this process.
Your benefit
Reliable
Reliable operation despite extreme process conditions
Cost effective
Measuring system can be installed without invasive work on the vessel wall and insulation
User friendly
Simple retro installation
Recommended products
POINTRAC 31
Radiation-based detection of maximum level for controlling the filling process
- Enables automated operation of the digester
- Non-contact measurement right through the vessel wall
- Maintenance-free operation
Measuring range - Distance
-
Process temperature
-40 ... 60 °C
Process pressure
-
VEGASOURCE 81
Source holder as receptacle for the radiation capsule
- High operational reliability with pneumatic actuation of the source holder
- Effective shielding allows minimal use of control areas
- Minimal space requirement and simple installation
VEGABAR 81
Pressure transmitter for pressure measurement in the digester
- Pressure measurement in aggressive media and high temperatures
- Long-term chemical resistance
- Resistant to pressure surges during emptying
Measuring range - Distance
-
Measuring range - Pressure
-1 ... 1000 bar
Process temperature
-90 ... 400 °C
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