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Pelton Turbine

Pelton Turbine

The pelton turbine is the key element that transforms the high pressure seawater coming from the hydraulic drivetrain to electricity using hydropower technology.

The pelton turbine is usually placed between multiple offshore turbines as a central hub for power generation. From there the electricity can be transported to other parts of the wind farm or to shore. This centralised electricity generation allows for economy of scale benefits & reduced maintenance. Pelton turbine technology is a fully matured technology and is used here to develop a commercially ready 100 MW, 400 bar Pelton Turbine design.

Process Timeline

  • Hydraulic drive train test set-up

    In our workshop in Delft a fully functional 500kW hydraulic drive train that includes a high pressure water pump (KAMAT) and a Pelton Turbine was developed and tested. 

  • Onshore full scale testing

    A fully operational 500kW hydraulic wind turbine including wind turbine control via spear valve and a slip joint was tested onshore at the Maasvlakte in the Port of Rotterdam.

    View the video of the construction and testing here

  • Offshore full scale testing

    Commissioning, operation, certification and decommissioning of the DOT turbine including a full scale slip joint and monopile installation.

    • Proof of slip joint concept
    • Level D, B & C type certification (DNV-GL)
    • Single lift installation of a WTG in combination with a floating installation vessel

    View the video of the construction and testing here

  • Reverse osmosis pilot

    Design, construction and testing of a 500kW wind powered electricity and seawater desalination plant.

    • Control of a wind turbine via spear valve in combination with a SWRO membrane
    • Proof of DOT wind powered desalination concept
    • Insight in pre and post water treatment requirements.

    View the video of the working principle here

Other innovations

All our innovations are supported by an extensive track record of studies, prototypes and offshore testing. Our approach is to “put steel in the water”: relentlessly testing the concepts in its designated environment of operation.

Hydraulic Drivetrain

The core of the DOT concept is a sea water pump directly driven by the turbine rotor. It is capable of slow rotation speed, high pressure and high-power output.

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Wind Turbine

Operating a water-pumping wind turbine allows for different control strategies. DOT develops these during the integration of the pump in different turbine platforms.

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Pelton Turbine

Power conversion from high-pressure seawater is done using hydropower technology a pelton wheel driving a generator. DOT creates an unprecedented 4km hydraulic head.

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Reverse Osmosis

High pressure seawater can also be used through a reverse osmosis system. The DOT turbine takes out several energy conversion steps to arrive at renewably cleaned water for drinking, irrigation or H2 production.

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Slip Joint

Speedy installation of the thousands of megawatts offshore wind is crucial to meet the Paris goals. The slip joint removes many cumbersome offshore handling operations, allowing single lift turbine installation.

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Beyond the slip joint, DOT supports innovations on pile driving technology, monopile design and cable and pipeline installation. The “steel in the water” drive makes DOT a valuable partner in Joint Industry Projects.

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