High Performance Organic Rankine Cycle System For Geothermal Power Plant

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 work.
• 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 cycle.

ORC system to be used for geothermal power plant

In most cases, the geothermal stream is introduced to the steam-water separator where the steam and the hot water are separated. The steam will be directly introduced to the steam turbine generator for electric power generation, while the hot water will be introduced into ORC system.

The geothermal hot water will be normally at the temperature between 90°C-150°C, which can be used as the heat source of ORC system for electric power generation.

The application of ORC system will greatly improve the whole efficiency of geothermal power plant and make more effective use of geothermal resources.

Rated Power Capacity of ORC system: up to 10 MW @single unit

A Typical Process Flow Sketch of Geothermal Power Plant