Developing decentralised solutions - Generate power from industrial waste heat
(PresseBox) - With advancing changes in the energy sector, interest in decentralised, variable power generators is growing. The use of waste heat from industrial processes can significantly contribute to increased energy efficiency and the generation of low carbon power. The Organic Rankine Cycle (ORC) takes a technological approach to the conversion of waste heat into power. For over 7 years, a Northern Bavarian consortium, consisting of the University of Bayreuth, OTH Amberg-Weiden Technical College and the company DEPRAG, have been successfully developing ORC systems, specifically, micro expansion turbines in low power ranges of under 50 kW (electric).
The recovery of unused energy, such as the heat in exhaust gases from combustion engines or gas turbines or even the waste heat from industrial processes, is a promising strategy to address the challenge to increase energy efficiency. The existing technical solutions, such as downstream steam power processes or turbines as expanders of natural gas, are limited to energy flows with a temperature of over 500
The concept: An efficient, small-scale ORC turbine
The ORC is particularly suited to the conversion of energy from heat sources with temperatures of 100ners have taken exactly this approach with their intensive research and development work. Firstly, a new type of highly-integrated turbine generator unit has been developed which is comprised of an axial impulse turbine with hermetically sealed synchronous generator (turbine image). Furthermore, an innovative heat exchanger design (plate and shell heat exchanger) has been tested to directly connect the ORC working medium with the exhaust gases. These measures avoid cost intensive intermediate circuits.
Close cooperation: Bayreuth and Amberg
In the project ?Development of an ORC mini generator for the utilisation of waste heat?, funded by the Bavarian Research Funding Charity from 2011 to 2013, the specific expertise of the three project partners were first brought together in several developmental stages: Stationary simulation and selection of fluid, design and production of a direct evaporator and a micro expansion turbine with generator, conception of the demonstration system as well as the building and operation of the system. The micro expansion turbine was calculated and designed by Prof. Dr.-Ing. Andreas Weiing exhaust gas temperatures of up to 300 degrees Celsius?, recalls Dr.-Ing. Theresa Weith, who worked on the project and now heads the subject area of heat transfer at the ZET.
Systematic further development: Wider application and flexible use
The research project is the first step in the systematic further development of the ORC technology by the project partners. After successful construction and testing of the experimental generator with direct evaporation of cyclopentane and a micro turbine as expander, a modular system for micro expansion turbines was developed. This came within the framework of the subproject of the Centre of excellence for combined heat and power generation, ?Micro expansion turbines with high speed generators for the conversion of waste heat in CHP or other industrial processes?, funded by the Bavarian State Ministry for Education and Cultural Affairs, Science and Arts, between 2013 and 2016. Three different representatives of this modular system have been extensively surveyed in a second ORC system using hexamethyldisiloxane (MM) as the working fluid.
Using the extremely reliable new ORC test generator, turbines can be tested not only at design point, but also under partial load, so that operational and efficiency characteristics can be determined. The measurements taken verify further increases in efficiency so that a degree of efficiency of almost 75
The Green-Energy-Turbine (GET) product family from DEPRAG SCHULZ GMBH u. CO., whose design is primarily based on the outlined project, also demonstrates that the ambitious objectives have reached beyond the scientific domain. There are five different sizes covering electric power ranges of 3
Despite the successes already achieved, the project partners have set themselves even more ambitious goals for the future. In the most recent project funded by the BFS, an adaptive turbine with variable geometry is being developed and tested in the existing
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Datum: 26.02.2019 - 06:26 Uhr
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