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Introduction of Energy Recovery Device used in SWRO - PowerPoint PPT Presentation


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Introduction of Energy Recovery Device used in SWRO. Wu Liming Tianjin University. literature. 1 Waste energy recovery in seawater reverse osmosis desalination plants.(Part 1) A.M.K El- ghonemy 1 November 2012.

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Presentation Transcript
slide2

literature

1 Waste energy recovery in seawater reverse osmosis desalination plants.(Part 1)

A.M.K El-ghonemy 1 November 2012

2 Waste energy recovery in seawater reverse osmosis desalination plants.(Part 2: Case study)

A.M.K El-ghonemy 27 April 2012

3 Pressure Exchange Apparatus With Integral Pump

Patent NO:us 7 214 315 B2

Date of Patent:May 8.2007

4 Axial piston Machine

Patent NO:us 7 988 428 B1

Date of patent:Aug, 2,2011

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slide3

Reverse osmosis

Osmosis process is the tendency of water to flow through semi-permeable membrane into a more concentrated solution

Concentrated Solution

membrane

Pure water

Pressure

Reverse osmosis is a form of filtration in which the filter is a semi-permeable membrane that allows water to pass through, but not salt.

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Concentrated Solution

membrane

Pure water

slide4

Pressure needed for RO

Pressure

The osmotic pressure of typical seawater is around 26 bar, and this is the pressure that the pump must overcome in order to reverse the flow . In practice , in order to achieve a generous flow of freshwater, a significantly

higher pressure as 50-80 bar is used.

Pressure

membrane

Pure water

Concentrated Solution

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slide5

Why SWRO

能量回收装置

Advantages:

1 Half of the energy needed by the thermal process.

2 Modularity of reverse osmosis units, Simplicity of operation

3 Lower environment impact.

Indeed, reverse osmosis process accounted for 59% of contracted desalination capacity as of September 2008, having grown at a rate of 17% per year since 1990.

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slide6

Why ERD

Electricity consumption is a main cost of SWRO. The RO reject stream contains most of the energy supplied to the seawater feed by the high pressure pump. Recovery of this energy and its utilization reduce the overall energy demand of SWRO.

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slide7

History of ERD

1980

1990

2000

2010

Francis turbine

turbocharger

Rotary exchanger

Piston exchanger

Pelton turbine

1 Energy recovery turbine (ERT) with Pelton wheels.

2 Turbocharger, a turbine driven centrifugal pump, mostly applied.

3 Pressure exchanger(PX),using a rotating ceramic rotor and allows the feed and concentrate to have direct contact.

4 Dual work exchanger energy recovery(DWEER), an isobaric device that used a piston and valves to separate seawater feed and the concentrated return.

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slide8

A new product of Danfoss

3-in-1 design

High pressure pump

Pressure exchanger

Electric motor

Advantages:

Efficiency: Reduced energy cost by 60% compared to SWRO plants with no ERD.

Simple: Fewer parts, easier installation. Fewer meters. Reduced fittings and pipes.

Reliable: Such product integrates the booster pump to eliminate sealing issues.

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slide9

Possible design

Electric motor

Booster pump

Two impellers, connected to a motor through a shaft ,are used to raise the pressure of the fluid

Pressure exchanger

Pressure is transformed in the cylinder channels

8/11

slide10

A new product of KSB

Booster pump

Electric motor

Pressure exchanger

High pressure pump

Advantages:

Reduced operation costs

High energy efficiency

Reliable and safe

Easy of system adaptation

4-in-1 design

High pressure pump

Pressure exchanger

Booster pump

Electric motor

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slide11

Possible design

Axial piston

A plunger-pump similar structure is united into the pressure exchanger, energy to raise the pressure from both the energy of electric motor and the rejected water.

shaft

Swash plate

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slide12

Theory of plunger pump

Swash plate

Axial piston

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