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Prediction Simulation analySiS world pulppaper86 Performed predictions and simulations can be selected analysed and compared to the real outcome of the process. the PSa can therefore be a tool to fine tune data models. Hallsta approached us to see if we together could develop a system which would present an overall view of the mill status says Kenneth Lundstrm Senior Systems Engineer at MOPSsys. In order to support decision making the mill needed a system with capability to simulate different production situations. The result was a MOPS PSA Predict and Simulate Analysis system which collects production data from different mill production and quality systems and every minute presents a prediction for the coming twelve hours regarding pulp and steam need and consequences for example storage tank levels. Depending on different mills needs the PSA displays can be modified to show different process parameters. Process operators can examine latest history together with process values for the next twelve hours. Simulations can easily be performed by starting from an existing prediction or simulation changing some input data and performing a new simulation. Performed predictions and simulations can be selected analysed and compared to the real outcome of the process. The PSA can therefore be a tool to fine tune data models. The way the prediction concept works is illustrated in figure 1. Data is fed from different mill sources into the MOPS PSA unit. In this example data consists of information about expected pulp consumption during the next twelve hours and a planned maintenance stop of two hours. If pulp production continues without changes the result will be an increased pulp level in the storage tank. On screen the operators can see the graphic presentation of when and how much the pulp level will increase and hence decide if and when pulp production will have to be changed. This figure shows a simplified situation. In reality the operators get much more detailed information such as the present and predicted pulp and steam production of each refiner. This makes it possible to adapt the way the TMP plant should be run in the most efficient and economical way. Figure 1. A simplified example of how the prediction concept works. Pulp consumption changes increase the level in the pulp tank if TMP production continues on the same level Hallsta 2. The PSA system was launched last May and has after some modifications proven to be a valuable tool says Maria McGuinness who was project leader at Hallsta for the PSA project