Technology:

Dürr Cyplan’s ORC System Increases The Efficiency of a Geothermal Power Plant In Indonesia (News Release)

The Principle of the ORC Process

Dürr Cyplan’s ORC technology (Organic Rankine Cycle) will increase the efficiency of a geothermal power plant in Indonesia. The pilot plant, used during a project of a German research institute in this Southeast Asian country, can increase the amount of electricity generated by up to 10%.

Geothermal power plants in Indonesia use steam to drive turbines and generate electricity. High-pressure hot water from a reservoir in the earth’s interior rises to the top through a borehole and evaporates in the power plant upon decompression. The steam is fed into the turbine, which produces electricity by means of a generator. Any water that has not evaporated is reinjected into the earth’s interior while still hot.

In future, the ORC system will be integrated into the cycle before the water is reinjected into the earth. It can generate additional electricity using the thermal energy of the hot water. Steam also drives a turbine in the ORC system. However, this steam is extracted from another medium, which is evaporated with the hot water. This medium has a far lower evaporation point than water.

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