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Prediction Simulation analySiS world pulppaper 85 Hallsta one of Holmen Papers Swedish paper mills has closed one paper machine a groundwood mill and two old solid fuel boilers and therefore needed an improved control of the energy balance. One of the restructuring projects involved development of a predicting and simulating system MOPS PSA enabling operators to balance changes in pulp steam and water supply between the TMP plants and the paper machines. The mill has two separate production lines each consisting of a TMP plant with four refiner lines and a paper machine with a common steam By Soren Back SB Kommunikation AB Production changes demanded new prediction and simulation solutions system for both production lines. The TMP plants produce pulp for their respective paper machine and steam to the common system supplying the paper machines with their need of steam. This means that production changes maintenance stops and production problems on the paper machines have direct effects on the pulp and steam production. The restructuring project work started in spring 2013 with the aim of being completed one year later says Maria McGuinness Production Engineer at TMP and project leader for the PSA project. With almost no other steam sources than the TMP refiners apart from two electrical boilers the new situation demanded a new way of running the mill. Therefore a new tool providing a concept for process control to support this situation using input from existing control systems was needed. We already had systems from MOPSsys in the mill so our first choice was to get in touch with them to discuss the situation and see if they could come up with a solution to our needs says Maria McGuinness. The idea was that Hallsta would supply all relevant data and connections between different production parameters and that MOPSsys would develop the system. With almost no other steam sources than the tmP refiners apart from two electrical boilers the new situation demamded a new way of running the mill Hallsta 1. Hallsta paper mill produces 550 000 tonnes of lightweight uncoated magazine papers and book papers on two paper machines