Stover Presentation HB2010- 2141

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Isobaric Energy Recovery Devices in Reverse and Forward Osmosis ProcessesRichard L. Stover, Ph.D.

2000 Giga Information Group#

OUTLINEEnergy recovery in seawater reverse osmosisERD development milestonesCurrently available devicesDesign challengesNext generation devicesNew applications

Performance analysis in companion presentation by Dr. Bill Andrews

2000 Giga Information Group#

Energy Recovery in Seawater Desalination

Positive Displacement (isobaric)Centrifugal (turbine)Source: Energy Recovery, Inc.

2000 Giga Information Group#

ERD Development MilestonesFirst isobaric device Cheng filed 1965Rotary isobaric device Hashemi filed 1966Large chamber device for SWRO Taylor filed 1973RO-isobaric device for lifeboats Keefer filed 1978Pressure exchanger device Hauge filed 1987Ionics Dyprex late-1980sSpool valve for work exchanger Shumway filed 1996Integrated Pump-ERD Clark Pump - Permar filed 1996

2000 Giga Information Group#

Currently Available Devices

KSB SaltecVari-RO IPER

AquaLyngRecuperator

Spectra Clark pump

Flowserve DWEERERI PXDanfoss iSave

2000 Giga Information Group#

How an Isobaric Energy Recovery Device Works

Low PressureSeawaterEnters the PlantHigh PressurePumpHigh PressureSeawaterHigh PressureLow PressureReject StreamLow Pressure Fresh WaterExits the Plant

High PressureReject Stream

Booster Pump

SeawaterMembrane

2000 Giga Information Group#

Pressure Exchanger ApplicationsBasic Osmotic Power

Pressure Exchanger Applications

Efficient Osmotic Power

8Not a design tool, rather a learning tool on how the PX fits into a system and works. 2000 Giga Information Group#

Pressure Exchanger Applications

Reverse Osmosis Desalination

Design Challenges

High-pressure sealleakage and integrityBrine-feedwater barrierPulsations / vibrationendured and transmittedNoiseOperational controlprocess transients and multi-device arraysUnit capacityCorrosionCapital costs and maintenance

2000 Giga Information Group#

Next Generation DevicesERI PX Titan and PX-300 devicesbigger

Sources: Energy Recovery, Inc. and EPO

2000 Giga Information Group#

Next Generation DevicesFlowserve/Calder ROVAsmoother

Sources: WDR and EPO

2000 Giga Information Group#

New Applications

Source: Energy Recovery, Inc.

2000 Giga Information Group#

New Applications

Source: Energy Recovery, Inc.

2000 Giga Information Group#

New Applications

Source: Energy Recovery, Inc.

2000 Giga Information Group#

New Applications

Source: Energy Recovery, Inc.

2000 Giga Information Group#

New Applications

Source: Energy Recovery, Inc.

Isobaric ERDTurbine /Generator

Membranes

CirculationPump

Fresh WaterSalt WaterDilute WaterOsmotic Power

2000 Giga Information Group#

New Applications

Source: Energy Recovery, Inc.Osmotic Heat Engine

Isobaric ERDTurbine /Generator

FO Membranes

Circ.Pump

Working FluidDraw SolutionDilute Water

RegeneratorQ inQ out

2000 Giga Information Group#

Thank you!

2000 Giga Information Group#