DECellulose production
Pulp digester
To extract the cellulose from the wood chips, the natural binder lignin must be removed and the cellulose fibres laid bare. This is carried out in the pulp digester with chemical decomposition methods. In the alkaline sulphate method, the fibers are fed into the digester by means of steam pressure at +180 °C. The subsequent cooking process using caustic soda, sodium carbonate and sodium sulphate is carried out at a temperature of +170 °C and under pressures up to 8 bar. Automatic operation of the digester requires exact monitoring of the level during filling and also of the pressure during the entire process.
Point level detection with MINITRAC 31
When the maximum value is reached, the screw conveyors must be switched off. Due to the process conditions, this measurement must be absolutely reliable and maintenance free. The radiometric level switch MiniTrac 31 fulfils these requirements.
Source holder SHLD
The source holder holds the radioactive source and focuses the radiation beam. It provides the best possible shielding at low container weight.
Pressure measurement with VEGABAR 51
Due to the high temperatures and extremely corrosive media, VEGABAR 51 with isolating diaphragm system is used here.
» MINITRAC 31
» VEGABAR 51
finder