TECHNOS © - ALSTOM 2009. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. Neither ALSTOM, its officers and employees accept responsibility for or should be taken as making any representation or warranty (whether express or implied) as to the accuracy or completeness of such data or the achievement of any projected performance criteria where these are indicated. ALSTOM reserves the right to revise or change this data at any time without further notice.

Technos

CONDENSER TUBE CLEANING SYSTEM

Continuous cleaning of condensers and heat exchangers maintains permanent efficiency of heat transfer without mechanical or chemical tube cleaning.

TECHNOS has developed a complete system to guarantee performance and Condenser safety, essential equipment for correct power plant operation.

CUSTOMER BENEFITS

Maximise heat transfer across tube walls

Improve Condenser vacuum

Increase unit operating efficiency and MW output

Reduce fuel consumption

Extend tube life by removing corrosive deposits

Eliminate costly downtimes and the high cost of mechanical or chemical cleaning of tubes

Reduce or eliminate the need for chemical water treatment

Respect the environment

HIGH PERFORMANCE AND HEAVY DUTY

High performance of a continuous on-line Condenser Tube Cleaning System is achieved by MAINTAINING A GOOD FLOW PATTERN throughout the circuit and particularly through the ball strainer. Circulating sponge rubber balls in the system keeps the TUBES CLEAN. TECHNOS has patented its ball strainer design, which maintains an EFFECTIVE CIRCULATIONof the sponge rubber balls and offers considerable improvements over other ball strainer designs. Each tube is CLEANED MORE OFTEN so that it is always in PERFECT OPERATING CONDITION.

FAST PAYBACK PERIOD

The benefits of maintaining the condenser tubes as clean as possible using TECHNOS’ HIGHLY EFFICIENTand reliable equipment means that the PAYBACK PERIOD for the necessary investment is VERY SHORT.

TECHNOS © - ALSTOM 2009. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. Neither ALSTOM, its officers and employees accept responsibility for or should be taken as making any representation or warranty (whether express or implied) as to the accuracy or completeness of such data or the achievement of any projected performance criteria where these are indicated. ALSTOM reserves the right to revise or change this data at any time without further notice.

RAW WATER INDUCES FOULING

When raw water is used as a cooling medium cleaning is necessary to avoid fouling such as:

Settling of materials in suspension (silt, mud, slime) inside the tubes

Biological detritus from the presence of bacteria or marine organisms

Crystallisation of soluble elements such as calcium carbonate, calcium silicate, sulphate or magnesium salt which induce scaling

Forming of sea shell colonies

THREE MAJOR INCONVENIENCES OF FOULING

CORROSION under deposits

REDUCTION of the heat transfer capacity

DESTRUCTION of the protective film inside the tube from marine organisms such as barnacles, which leads to corrosion. The cleaner the sea water is, the more marine organisms settle.

HEAT TRANSFER EFFICIENCY

in steam turbine condensers has a direct effect on the power production. Experience has shown that an increase of 1 mbar in the condenser vacuum of a 900 MW Power Unit leads to a final loss of about 1MW of power output.

AN UNCLEANED CONDENSER

can easily loose over 10 mbars. In such a case the use of a CTCS will increase power output by more than 10 MW.

It is essential to consider the condenser like a primordial component in power production.

Therefore its efficiency should always be optimised.

TECHNOS © - ALSTOM 2009. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. Neither ALSTOM, its officers and employees accept responsibility for or should be taken as making any representation or warranty (whether express or implied) as to the accuracy or completeness of such data or the achievement of any projected performance criteria where these are indicated. ALSTOM reserves the right to revise or change this data at any time without further notice.

HIGH EFFICIENCY

Balls are immediately collected and reinjected into the condenser inlet. Balls are extracted in the central area of the strainer (highest velocity) and not along the walls (lower velocity). Velocity generated by the TECHNOS vortex chamber is over five times the on-line velocity of water.

SELF CLEANING COLLECTING DEVICE

The Karman Vortex effect enables self cleaning of the collecting area, even without a Debris Filter upstream.

REVAMPED OR NEW

TECHNOS has installed Condenser Tube Cleaning Systems in new and existing Plants.

GRIDS

Rigid frame construction creates very sturdy collecting grids.

PERFECT SEALING

Control of both torque and position allows a perfect sealing of the grids and guarantees that no cleaning balls escape from the circuit. Also the use of one actuator for each grid prevents any mispositionning.

CORROSION PROTECTION

Special painting when noncorrosive fresh water

CuNi plated or plain stainless steel for desalination plants

Rubber lining in sea or corrosive water.

WHAT MAKES TECHNOS UNIQUE ?

TECHNOS © - ALSTOM 2009. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM. The other names mentioned, registered or not, are the property of their respective companies. The technical and other data contained in this document is provided for information only. Neither ALSTOM, its officers and employees accept responsibility for or should be taken as making any representation or warranty (whether express or implied) as to the accuracy or completeness of such data or the achievement of any projected performance criteria where these are indicated. ALSTOM reserves the right to revise or change this data at any time without further notice.

HOW DOES TECHNOS’CTCS WORK ?

Continuous cleaning of internal

tube surfaces is accomplished

by constant circulation of sponge rubber balls with a diameter slightly larger than the tube inner diameter.

These sponge rubber balls are

injected into the cooling water

inlet. The water flow carries them into the inlet water boxes, then through the tubes and finally into the ball strainer located at the cooling water outlet.

From there, they are extracted and pumped through the ball collector and back to the cooling water inlet.

The ball collector stores the sponge rubber balls prior to backwashing the strainer grids.

1 Strainer section

2 Ball recirculation pump

3 Ball collector

4 Ball injector

5 Ball monitor

6 Debris filter

RANGE OF APPLICATIONS

Tubular heat exchangers of all sizes for Power and Process Industries

Heat exchangers in Desalination Plants

Systems using ferrous sulphate treatment to smooth out the Fe2+ film coating

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53

2

4

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