Principle of ORC system
- The low boiling point organic working fluid makes heat exchange
with the heat source through evaporator, then absorbs heat and is
evaporated to high temperature & high pressure steam.
- The high temperature & high pressure steam drives the turbine
expander & generator set for electric power generation.
- The temperature and pressure of organic steam is decreased after
- The organic steam with low temperature & pressure flows into
the cooling system to be condensed to fluid.
- The organic working fluid is pressurized by the fluid pump for next
ORC system for waste heat recovery from process streams
- Oil refining processes take place at high temperatures and the
products (diesel, gasoline, kerosene) flow out at temperature
between 150°C and 250°C. These products must be cooled down before
- In production processes of an oil refining or a petrochemical
plant, thermal streams from process complexes take place at
medium-low temperature, which need to be cooled down before next
In both cases, the thermal streams can be directed into an ORC
system with proper working fluid for electric power generation.
ORC system - Process Flow
Heat source temp(inlet)
Heat source temp(outlet)
Rated power capacity