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ORGANIC RANKINE CYCLE FOR 
BIOMASS


In small biomass plants, the ORC is the ideal choice due to its high efficiency, availability and ability to follow load dependent on fuel supply. In addition, the elimination of the steam turbine for traditional biomass solutions brings with it a number of maintenance and operational advantages.

The  EXERGY solution for power generation from biomass is an ORC module utilizing the Radial Outflow Turbine coupled with a biomass boiler. The ORC module can be used to produce electrical power and thermal power, this latter utilized for cogeneration purposes such as:

  • cogeneration for industrial processes
  • district or residential heating
  • trigeneration (production of warm and cold streams for heating and cooling purposes)


The biomass feed of the boiler that can be exploited as "fuel" include for example wood industry waste, olive waste or other secondary biomass. 

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ADVANTAGES
  • Higher power and efficiency to capital cost ratio
  • High reliability thanks to proven technology
  • Flexibility in Biomass feed quality
  • Small modular, lightweight plants for easy installation
  • Few civil works required
  • The absence of a steam turbine simplifies operations and reduces maintenance
  • No water consumption 

 

BIOMASS TYPICAL APPLICATIONS
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ORC CYCLE FROM BIOMASS 

 


The boiler through the combustion process converts the biomass in thermal power to feed the ORC module. The hot exhaust gas warms up the intermediate fluid in a heat exchanger. The ORC-boiler interface circuit transfers the thermal power from the boiler to the ORC evaporator. The commonly employed intermediate fluids between the boiler and ORC are thermal oil, pressurized water, steam. The interface fluid 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.