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

A Bryszewska-Mazurek ,Walentyna Mazurek

doi:10.1051/e3sconf/20184500011

A Bryszewska-Mazurek , Walentyna Mazurek

Open Access

https://doi.org/10.1051/e3sconf/20184500011

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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.

Highlights

Organic Rankine Cycle (ORC) technology is a reliable method to convert low grade heat into electricity
The basic parameter characterizing the ORC unit is its electric power output. This power output is crucial for profits from energy sales, and on the other hand it is connected with the price of an ORC unit
The shortest simple payback time (SPBT) was about 4 years and it was obtained when the entire heating demand was covered by extraction steam

Summary

Introduction

Organic Rankine Cycle (ORC) technology is a reliable method to convert low grade heat into electricity. ORC systems are used in many renevable energy applications (geothermal, biomass, solar thermal) [1, 2]. Waste heat recovery is an emerging field for ORC technology. The combined cycle power plant (CCPP) could be more efficient than the single cycle, because of its use of low grade waste heat. A lot of studies have been conducted on the utilization of the exhaust gas heat from thermal power plants to power organic Rankine cycle plants for further power generation. Tri-generation systems such as combined gas- and steamturbine cycle power plant (CCPP) integrated with organic Rankine cycle (ORC) and absorption refrigeration cycle (ARC) [4] have been developed

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