Experimental and numerical investigation of direct liquid injection into an ORC twin-screw expander
| Autor: | Florian Rieger, Richard Aumann, Fabian Dawo, Hartmut Spliethoff, Andreas Schuster, S. Eyerer, Christoph Wieland |
|---|---|
| Přispěvatelé: | Lehrstuhl für Energiesysteme |
| Rok vydání: | 2019 |
| Předmět: |
Organic Rankine cycle
Materials science 020209 energy Mechanical Engineering Nuclear engineering Mass flow Renewable heat 02 engineering and technology Building and Construction Pollution Industrial and Manufacturing Engineering ddc Waste heat recovery unit General Energy 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering Working fluid Electric power 0204 chemical engineering Electrical and Electronic Engineering Organic Rankine Cycle (ORC) Control strategy Direct liquid injection Screw expander Experimental study Modeling Evaporator Civil and Structural Engineering Heat engine |
| Zdroj: | Energy. 178:867-878 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2019.04.172 |
| Popis: | The Organic Rankine Cycle (ORC) is a thermal engine, which is used to convert low temperature heat to electrical power using organic working fluids. It is an established technique for waste heat recovery and for the utilization of renewable heat. This study presents a novel operational strategy of an ORC, which allows for reliable control of process parameters while simultaneously ensuring high power output. Preheated liquid working fluid is injected directly into a volumetric screw expander at an intermediate pressure level. The injected mass flow bypasses the evaporator and can be controlled by a valve. Thus, direct liquid injection into the expander reduces the exhaust temperature, leading to a lower risk of thermal damages in case of a hermetic or semi-hermetic expander. This strategy is analyzed experimentally and compared with a system simulation. The experimental and simulation results show that the exhaust vapor temperature can be reduced by approx. 40 K for the investigated operational conditions. This enables the expander to run at higher live vapor conditions by simultaneously ensuring sufficient cooling of the generator and thus allows for up to 40% higher power production depending on the operational conditions. |
| Databáze: | OpenAIRE |
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