Using the organic Rankine cycle (ORC) principle, the double cycle screw power generator set takes the organic working medium with low boiling point as the power generating medium. After heat exchange and gasification between the evaporator and low grade heat source (low pressure steam or hot water, etc.), it enters the screw power generator to expand and output power. After work, the working medium with low boiling point is condensed into liquid by the condenser and then returned to the evaporator through the working medium pump to boost the pressure and complete the cycle for heat transfer again.
This series of units can use the lowest heat source of 70℃ for gridless power generation, has the incomparable advantages of similar products in the country, compared with the united Technologies Corporation (UTC) developed low temperature generator set of 80℃ minimum power generation temperature, has a wider use space.
The whole system is mainly composed of evaporator, screw motor, generator, condenser, working medium pump and electrical control system.