Cryostar has been a world leader in radial inflow turbine technology for more than
30 years and our superior product quality is recognised across the globe. Since
1986, we have used our expertise to provide energy recovery solutions, ensuring
optimum recovery through highly efficient and economical operations.
Our installed base of generator loaded turbines comprises over 130 units and more
than 60MW installed, including 20 machines on natural gas distribution networks.
The natural gas installations have so far provided our customers with more than
1000 GWhs of recovered electricity.
Cryostar is the selected supplier of expanders for two on-going projects based on
Kalina Technology.
For historical reasons axial turbines derivate from steam turbine technology are
chosen for energy recovery from geothermal or waste heat sources. Nevertheless
radial inflow turbines technology perfectly matches the need of binary cycles with
higher isentropic efficiency from 85 to 90%.
The presentation outlines some criteria and limitations for selecting the best
turbine design. We show that, for most of the process data issued from binary
cycle, the turbine can run at the best efficiency.
The second part of the presentation is mainly focused on basics of expander
technology. It is shown that expanders for binary cycle does not required special
developments and that standard products can be used with minor modifications. Those
special requirements are described in more details.
The last part deals with the choice of the best combination of expander size and
binary cycle fluid for Organic Rankine cycle. It is shown that choosing an
optimised fluids mixture leads to increase the total cycle efficiency and decrease
at the same time the size and cost of the expansion turbine. Some examples are
given.
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