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Thesis for the Degree of Master of Science

 

Year 2010
Fredrik Enell

Chlorine dioxide generation plant: a mass balance study and the implementation of a production control system


The increasing economical challenges for the pulp industry compel the industry to lower production costs. Optimising the production control and the utilisation of bleaching chemicals can significantly reduce these costs. The aim of the thesis is to optimise the operation of the chlorine dioxide plant at the UPM-Kymmene pulp mill in Pietarsaari, following an expansion of the chlorine dioxide plant in 2008.

In the literature review, the current state of the art in chlorine dioxide production technology is reviewed. As the SVP-LITE process was implemented at the pulp mill, it is particularly focused upon. In addition, advanced control strategies for the production of chlorine dioxide are reviewed. In the experimental part, an advanced production rate control system was specified and implemented in order to optimise the operation of the chlorine dioxide plant. Further, several issues to obtain optimal process operating conditions were solved.

The production rate control system was successfully implemented and is operating as desired. The main benefit of the production rate control system is the insurance of chlorine dioxide availability in case of a forced shutdown of the chlorine dioxide plant. Further, the optimisation of the process has contributed to the decrease of chemical consumptions as it is possible to operate the process under steady conditions, thereby avoiding undesired alterations to chemical concentrations.


This info last modified 24 Sep 2017 by Jerri Kämpe-Hellenius