2011. 12.01

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2011.12.01

By longfei hui

Study on the composite film’s fouling resistance and heat transfer performance

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–Background–current work–Next plan–Thanks

contents




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– Heat exchangers are most often seen facilities in the industry. during the process of the heat exchange, fouling is a seriously problem.

– the fouling reduces severely the efficiency of the heat transfer, results in great loss of energy and even affects the safe of the equipment .

Background




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– Observation and research on the fouling has been taken since 1920s, however, until now the fouling in heat exchangers is still an unsolved problem.

– So it’s of great significance to find new methods to improve the fouling resistance of the heat exchang-ers. economically, it’s of great benefits.

Background




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Background

Country Fouling loss/ billion $

GNP/ billion $ Percentage/%

UK 64.3 25700 0.25

USA 349.5 139800 0.25

Germany 82.0 32800 0.25

Japan 132.3 52900 0.25

New Zealand 1.5 1020 0.15

Australia 11.2 7460 0.15

In China, just the loss results from fouling in thermal power is over 0.1 ％ of GNP.




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Back-ground

physical means

chemical means

surface engineer-ing technology

Mechanical Cleaning

Online mechanical cleaning

scale inhibitors

Chemical clean-ing agents




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Advantages of surface engineering technology

surface with a variety of functions and crystal form.Thin surface coating films.Saving energy and resource.

Background




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– the fouling is difficult to stick onto the heat transfer surfaces with low surface free energy.

– the micro-nano coatings as heat transfer surfaces are prepared on the substrates of stainless steel.

– The fouling tests on the coatings are carried out in the fouling solution of CaSO4.

current work




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– Shigehito Deki prepared TiO2 films on the glass sub-strate with LPD method.

– Zeng zhenou prepared uniform and compact TiO2 coating surface on the 304 stainless steel.

– It can be known from the literatures that TiO2 coat-ing surface shows high fouling resistance and anti-corrosion performance.

current work




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– On the basis of the former research, prepared TiO2-FPS composite coatings using fluoroalkylsilane.

current work

CF3(CF2)7(CH2)2Si(OCHCH3)3

CH3

The composite films have a very low surface free energy and show hydrophobic proper-ties.




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current work

1

The anatase ti-tania coatings are prepared on the substrate with LPD method

2

The titania coat-ings are dipped with FPS solu-tion to prepare the composite hydrophobic coatings (TiO2-FPS).

3

Test the anti-corrosion per-formance and fouling resis-tance perfor-mance.




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–Experiment process

– Firstly, the stainless steel are polished and then ul-trasonic cleaning with 10% NaOH solution, absolute alcohol and de-ionized water successively.

– Prepare deposition solution with (NH4)2TiF6 and H3BO3 and use LPD method to prepare TiO2 coating. After deposited for a certain time, the stainless steel was heat treated .

current work




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–Experiment process

– The prepared TiO2 coating surface was then dipped into the FPS solution for 2-3h and heat treated at 150 to prepare TiO℃ 2-FPS composite coatings. Sur-face prepared by this method shows high hydropho-bic.

– Test the performance of the TiO2 and the composite hydrophobic coatings in the pool boiling system.

current work




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Hydrolysis reaction Adsorption and dehydration with titania substrate

Polycondensation of FPS




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Continue the coating surface preparing and pool boiling heat exchange experiment.

Attempt to enhance the anti-corrosion and foul-ing resistance performance of the coatings.

Next plan

Next plan




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Thanks for your atten-tion



2011. 12.01

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