ORC - Cogeneration from biomass


Cogeneration ORC (Organic Rankin Cycle) units can produce heat and electrical energy with user friendly operation. The generated electrical power usually ranges from 600 kW to 3 MW. ORC Split system allows maximization of electric power production from a given biomass consumption due to a more efficient exploitation of thermal power from the boiler.

Description of ORC (Organic Rankin Cycle)

Equipment with the help of the cogeneration process produces electrical power and heat power from biomass (e.g. wood chips). Biomass is combusted in a boiler. Hot gases in the exchanger transfer heat to the oil circulation (thermo-oil). The remaining heat is further reduced in the water exchanger (economiser), waste gases are, after cleaning in the filter, led out to the surrounding environment by a chimney. The thermo-oil circuit creates a source of energy for the production of electrical power in the ORC equipment. This is equipped with closed circulation in which silicon oil is driven by evaporation to a block turbo-generator. Then the steam condenses, heat energy is released in the form of hot water back into the heating network. In the water exchanger (economiser) of the boiler for biomass there is the water circuit further heated to the required value.


  • – District Heating Networks
  • – Timber drying in sawmills
  • – Drying of sawdust in factories produce wooden pellets


Advantages of the concept

Technical and operational advantages
  • High cycle efficiency
  • Very high turbine efficiency (up to 90 %)
  • Low mechanical stress of the turbine due to the low peripheral speed
  • No corrosion of blades, thanks to the absence of moisture in the vapor nozzles
  • Automatic and continuous operation without needed of an operator attendance
  • Partial load operation down to 10 % of nominal power
  • High efficiency even at partial load
  • Quiet operation and long life