Cooperation of the Organic Rankine system with a cogeneration steam power plant - case study

¹ Wroclaw University of Science and Technology, Faculty of Environmental Engineering, 50-370 Wroclaw, Wyspianskiego 27, Poland

^* Corresponding author: anna.bryszewska-mazurek@pwr.edu.pl

Abstract

The cooperation of the ORC system with a cogeneration steam power plant has been considered. A district heating network is supplied from a bleeder turbine. An ORC system can utilize redundant heat, especially during the summer season, when only domestic hot water needs are served. The aim of the study was a selection of an extraction steam flow to produce the maximum electric power in an ORC system and also to cover the changing heating demand in the district heating network under consideration. Various values of extraction steam flows obtained from the bleeder turbine were considered. For a given extraction steam flow, the optimum ORC size has been adjusted. The average annual efficiency of the ORC was estimated at 0,12 (for the cyclic temperatures 120/35°C). The shortest simple payback time has been estimated at 4 years, assuming that heat from the bleeder turbine meats the heating demand throughout the year and thus the ORC system also operates throughout the year.