DEProcess stabilization in the approach system
Stock deaerators
The approach system connects the stock preparation plant with the paper machine. In this area, the pulp is thinned down to concentrations of 0.2 ... 1.4 % and its flow is stabilized. Among other things, the quantity and the flow speed of the pulp are regulated and the remaining contaminants are removed in screens and cleaners. An especially important element are the stock deaerators in front of the headbox. Under vacuum they remove the residual air and ensure steady machine operation and constant quality parameters.
Level measurement with VEGADIF 65
To operate effectively, the stock deaerator must always be kept at a defined, millimetre-exact level. The continuous level measurement guarantees this and also protects the downstream stock pump against dry run damage. Since the level amounts to only several hundred millimetres with superimposed vacuum, the differential pressure transmitter VEGADIF 65 is used here. Front-flush flange isolating diaphragms avoid deposits, and bilateral capillary lines inhibit thermal effects on the measurement.
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