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\LARGE \textbf{Abstract}
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Norske Skog's paper mill at Skogn,Norway, needs steam for its paper machines and various other parts of the factory. The main steam producer is a 50MW CFB boiler, which burns a range of different fuels. It is currently constrained below its rated capacity. The aim of this thesis has been to investigate reasons for this, as well as quantify potential losses and suggest improvements. \\

The reasons for the constrained boiler is that air is leaking into the flue gas system at various points. This increases the total amount of gas in the flue gas system, and causes the flue gas fan to become a bottleneck for the operation. \\

The economic loss associated with this is estimated for the period 3.june 2017 - 4.june 2018 to be 8.57 MNOK. This should provide a decent incentive for fixing the leaks. \\

There have also been some investigations into other parts of the process, something that lead to the decicion of turning off a simple pump. This small change is estimated to save the company thousands of NOK each month.\\ 