This master thesis discusses the energy system of the company in the paper industry. The focus is on the production of process steam and electricity for the paper production process. We described the properties for the primary (heating plant) and peak (boiler) energy system in detail, defined the machines and devices that form the system, and analysed the consumption of the technological steam to determine the operating points of both energy systems. We setup numerical models for both systems using the IPSEpro software environment with implementation of the known operating parameters. We studied the parameters and the efficiency of both energy systems. We found that in the case of nominal operation, the peak energy system could meet the year-round consumption of industrial steam in the technological process. We have also proven that it is crucial to consider exergy parameters in addition to energy flows and efficiency. Numerical models allow the user to change the operational parameters in the model and analyse the desired parameters. The company can use the numerical model as a useful tool that enables analysis of the system's behaviour before installation and implementation in a real system.
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