System Analysis of Pulp and Paper Production in the Development of Schemes for the Generation and Transformation of Secondary Energy Resources

The issue of conducting system analysis of complex industrial circuits is considered. A unified software product has been developed, including structural and thermodynamic analysis of circuits. System analysis made it possible to carry out a sequential thermodynamic calculation of the thermal technological scheme of pulp and paper production with a minimum of iterations in order to subsequently select an option for increasing its energy efficiency. Waste energy flows with the highest thermodynamic potential were identified. A system for generating secondary energy carriers has been developed. The system uses the potential of the selected waste energy flows of 15.7 MW. The generation system includes thermal energy transformers that use the heat of heated exhaust air from drying plants, the overhead product of process separation columns and wastewater. When choosing an energy-saving measure, it is recommended to take into account, together with the exergy efficiency, the amount of secondary energy resources.