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Title: Comparative thermodynamic analysis of an improved ORC process with integrated injection of process fluid
Authors: Krail, Jürgen 
Beckmann, Georg 
Schittl, Florian 
Piringer, Gerhard 
Keywords: Waste heat recovery;Organic rankine cycle (ORC);Process simulation;Improved process design;Process efficiency
Issue Date: Dec-2022
Publisher: Elsevier
Source: Energy
Project: Elsevier Austrian Institutions Open Access Agreement 
Journal: Energy 
Abstract: In contrast to water-steam Rankine cycles, the ORC process uses organic working fluids. For working fluids of the dry class, a recuperator heat exchanger is frequently installed to increase the cycle efficiency. This paper analyses an improved ORC process with these features: A liquid working fluid stream is injected into the vapour flow between the high-pressure and the medium-pressure stage of the turbine. Furthermore, the recuperator is replaced by a spray condenser. The main objective is to increase efficiency with moderate changes in the process layout. A thermodynamic comparison of the improved process with a state-of-the-art ORC process is carried out by simulations and optimisations. A significant efficiency gain for the improved ORC process is obtained by a combination of the aforementioned features, mainly because of an increase of the mass flow in the economiser of the vapour generator (better heat utilization) and a corresponding mass flow in the medium stage of the turbine (additional power production). As a use case, waste heat utilization from clinker cooler at a temperature level of 275 °C was simulated. The improved process would lead to a significant increase in the overall net efficiency by up to 14%, compared to a state-of-the-art ORC process.
ISSN: 0360-5442
DOI: 10.1016/
Rights: info:eu-repo/semantics/openAccess
Appears in Collections:Energie-Umweltmanagement

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