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ORGANIC RANKINE CYCLE FOR 
HEAT RECOVERY - POWER STATIONS


The Organic Rankine Cycle (ORC) is ideally suited to exhaust heat recovery from both engines and small gas turbines. The revolutionary Radial Outflow Turbine offers superior, high efficiency for modern low temperature engines. Advantages for heat recovery plants include  no need for water treatment and make up.

ADVANTAGES
  • No water treatment plant or make up water
  • Automated operation
  • Competitive capital costs, leading to fast payback
  • High efficiency at a variety of operating temperatures and loads
  • Fast start up and shut down
  • Flexible placement, away from the heat source if required
APPLICATIONS
  • Gas engines
  • Diesel engines
  • Biogas engines
  • Gas turbines
  • Compressor stations
WASTE HEAT RECOVERY CYCLE

 

A heat recovery system extracts the thermal power from the exhaust of the engines or turbines to feed the ORC module via the intermediate fluid. The intermediate fluid, which is usually oil, transfers heat to the organic fluid in the ORC evaporator, where the organic fluid vaporizes. The vaporized fluid then passes to the turbine. Here the vapour expands causing the turbine to spin and creating electricity into the generator.

The vaporized organic fluid then continues through the cycle to the condenser where it is once again becomes a liquid. It then passes through the pump before beginning the cycle again. 



The chart below reflects the most likely use of the ORC in comparison to traditional Rankine Cycle applications. It can be noticed that at very high temperatures and large sizes steam can offer the most suitable all round solution. However as the temperature and, or size falls, ORC can offer advantages and become the only practical solution. Also, of course if water is not available, then the steam solution cannot be considered.

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