Small Scale Liquefaction/Compander
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Compander
On Land
The name Compander describes a multi-shaft turbomachine, incorporating both compressor and expander stages. The energy generated during the expansion process is returned to the system to improve efficiency.
Cryostar built the first compander in 1996.
A typical compander is electric motor driven and consists of three compression stages and one expansion stage, mounted on a common gearbox and frame to produce the cold power required for liquefaction processes. System efficiency is achieved by the use of high-performance turbine wheel designs and further enhanced by the use of (water or air) inter- and aftercoolers.
Companders using nitrogen as a process medium are often used in Brayton Cycle natural gas liquefaction plants.
In case of water coolers, the inter- and aftercoolers may be rack-mounted as per picture above.
Companders are supplied skid-mounted and packaged to include drive motors, seal gas systems, lube systems and necessary instrumentation.
ECOCHILL
On Water
For applications using medium pressure 2-stroke propulsion a different option is available, where simply circulating a stream of LNG and subcooling it through a heat exchanger, before returning it to the cargo tank.
Cryostar has developed a closed loop cooling system, utilising magnetic bearing turbomachinery technology with several stages of compression and a single expander, to provide the necessary cold power. The system remains completely independent of the usual cargo handling machinery, thereby allowing full optimisation of fuel gas supply systems, while still providing an efficient means for tank pressure control.
The hermetic machinery and closed loop mean that expensive cooling media are avoided and simple operation across a wide flow range without compromising efficiency is possible. Equipment is supplied fully skidded with a minimum of interfaces for simple installation.