Energy Recovery Devices DeROs®

  • Want to reduce the operating costs of water production facilities

  • I want to reduce CO2 emissions

Energy Recovery Devices(ERDs) are essential equipment for RO membrane seawater desalination plants.
DeROs® is the first domestically produced ERD that utilizes our pump and valve technology.
In operation at plants both in Japan and overseas, it has been proven to have the world's highest level of energy recovery efficiency and minimal mixing.

  • - Energy recovery efficiency up to 99.7%

  • - Mixing less than 1%

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Features

  • Energy recovery efficiency up to 99.7%

    By optimizing the shape of the water flow section, internal losses are reduced, resulting in an energy recovery efficiency of up to 99.7%.
    This can significantly reduce the operating costs of water production facilities.

  • Almost no mixing

    The flow of high-pressure concentrated seawater into the high-pressure seawater inside the ERD is called mixing.
    If the mixing volume is large, the salinity of the high-pressure seawater supplied to the RO membrane increases, and the pressure required for filtering through the RO membrane increases, which increases the energy consumption of the High Pressure Pump and is uneconomical.
    DeROs® has a piston built into the cylinder that recovers energy, which separates seawater from concentrated seawater. By controlling the inner diameter of the cylinder and the outer diameter of the piston with high precision, we have achieved mixing of less than 1%. Compared to other types of ERD, the power consumption of the High Pressure Pump is lower.
    There is no increase in the amount of mixing over operating time.

  • Leaking Zero

    By adopting a Switching Valve with an internal seal, there is zero leakage of high-pressure concentrated seawater to the low-pressure concentrated seawater side.
    This contributes to reducing the power consumption of High Pressure Pump.

  • No lubrication required

    Reciprocating type, no lubrication required. No leakage inside the ERD, high efficiency.

  • Applicable to a wide range of flow rates and pressures

    We can cover any size plant, whether small, medium or large.

  • Low noise and vibration

    The flow rate in each cylinder is precisely controlled by the Switching Valve installed in each cylinder.
    Prevents the piston from colliding with the end of the cylinder.
    In addition, low noise and vibration are achieved by operating the piston at a low speed.

  • Maintainability

    Maintenance is limited to on-site replacement of consumable parts. The piston that moves inside the cylinder does not require maintenance.

Operating Principle

    1. Two or three cylinders are set in parallel, and low-pressure seawater and high-pressure concentrated seawater are alternately supplied to the cylinders by switching the flow path inside the Switching Valve.
    2. In the diagram above, cylinder B receives high-pressure concentrated seawater from the RO membrane unit, and undergoes the energy recovery process in which high-pressure energy is transferred to the low-pressure seawater inside the cylinder.
    3. The other cylinder, A, receives low-pressure seawater from the intake pump and simultaneously performs a water supply process to discharge low-pressure concentrated seawater after energy recovery.
    4. Each cylinder alternates between the energy recovery stroke and the water supply stroke to perform continuous energy recovery.
    5. The booster pump increases the pressure to compensate for the pressure loss in the RO membrane, DeROs® , and connecting piping.

  • The diagram above shows an example of DeROs® installed in an RO seawater desalination plant with a recovery rate of 50%.

    • Seawater is taken in at a flow rate of <100>, and of that, a flow rate of <50> multiplied by the recovery rate is pressurized by a High Pressure Pump and sent to the RO membrane.
    • Meanwhile, the remaining seawater <50> is sent to DeROs® , where the pressure of the high-pressure concentrated seawater discharged from the RO membrane is transmitted inside the cylinder.
    • The high-pressure seawater to which pressure has been transmitted is boosted by the booster pump to compensate for the pressure loss in the RO membrane, DeROs® , and connecting piping, and then merges with the high-pressure seawater sent from the High Pressure Pump, resulting in a flow rate of <100>, which is then supplied to the RO membrane.
    • After energy recovery, the concentrated seawater is discharged through a Switching Valve as low-pressure concentrated seawater.
    • By installing DeROs® , the discharge volume of the High Pressure Pump is halved, which also halves the power consumption, enabling a significant reduction in power consumption.

specification

DeROs® lineup

  • High efficiency and low mixing
    DeROs® standard model     DeROs® -L2

    • Equipment configuration (per unit)

      • - Cylinder ：2 bottles
      • Switching Valve(electric actuator drive) : 2 units
      • -non- Check Valve : 4 units

    • High pressure concentrated water flow rate ：80～200m3/h

    • Maximum Operating Pressure ：8.3MPa

    • Cylinder Length ：4.0～7.0m

  • Covers even large flow rates.
    Extremely quiet 3-cylinder model     DeROs® -L3

    • Equipment configuration (per unit)

      • - Cylinder ：3 bottles
      • Switching Valve(electric actuator drive) : 3 units
      • -non- Check Valve : 6 units

    • High pressure concentrated water flow rate ：80～300m3/h

    • Maximum Operating Pressure ：8.3MPa

    • Cylinder Length ：3.0～7.0m

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