Broadly defined, biomass is any organic matter derived from plants or animals and is readily available on a renewable basis. In the context of combustion-based electricity generation, the term biomass typically refers to all types of plant derived biological material and includes wood and agricultural crops, herbaceous and woody energy crops.  

With a global installed capacity of more than 60GW, biomass power plants account for more than 3% of the total electricity generation. Contrary to the intermittency of wind and solar based power biomass plants provide reliable base-load power to the grid; accordingly biomass based electric power is expected to have a critical role in meeting renewable energy targets worldwide.



In an ORC based power plant, biomass is fed into the thermal oil boiler which supplies heat to the ORC via intermediary thermal oil loops. Within the ORC heat is converted into electric power (supplied to the gird) and thermal power (supplied to users as heating/cooling or dissipated).  


01. Biomass combustion    02. Thermal oil   03. ORC process 

The process starts with the hydraulic feeding system transferring the biomass fuel into the combustion chamber. 

Biomass travels through the combustion chamber on a moving grate where combustion is automatically controlled by both the feed rate and the supply of air to control critical combustion parameters and maintain a steady thermal output 


Hot exhaust gases from the combustion chamber flow to the heat transfer oil system which mainly consists of the thermal oil heat exchanger and the downstream economizers.

The thermal oil is heated up to the temperature required by the ORC and channeled through pipes to the ORC's evaporator.  


The heated thermal oil is pumped to the ORC evaporator where through heat exchange a suitable organic working fluid is vaporized and expanded in a turbine that drives the electric generator.

After leaving the turbine, the organic working medium pre-heats the organic liquid and then condenses and delivers heat to the cooling water circuit. 


For a detailed description details on VAS thermal oil boiler system and the combustion process click here 



For more info on how the Turboden ORC process works click here 



The electric power output of Turboden's turbogenerators generally ranges between 200 kW and 15 MW. Depending on whether there is requirement for Heating and/or Cooling, Turboden ORC units can be configured for either electricity-only applications (HRS units) or Combined Heat and Power applications (CHP units). 

Click here  to view Turboden's available models for biomass applications 



Turboden’s ORC units operate essentially as a plug and play device, consistently delivering the expected electric and thermal output values and performance when provided with a thermal input as specified.    

While Turboden ORC units are effectively boiler agnostic, selecting the appropriate thermal oil boiler for each application is critical for reaching peak plant performance, reliability and availability especially when dealing with technically challenging biomass fuels. 

INMIS has established partnerships with leading thermal oil boiler suppliers and offers the full range of EPC services at the highest quality standards as set by Turboden’s ORC technology.  

 Click here   to view more info on the thermal oil boiler suppliers INMIS is working with. 


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