Transcript 슬라이드 1
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Study on the composite film’s fouling re sistance and heat transfer performance
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By longfei hui
2011.12.01
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contents – Background – current work – Next plan – Thanks
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Background
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– Heat exchangers are most often seen facilities in the industry. during the process of the heat exchange, fo uling is a seriously problem.
– the fouling reduces severely the efficiency of the hea t transfer, results in great loss of energy and even aff ects the safe of the equipment . Copyright © by ARTCOM PT All rights reserved.
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Background
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– Observation and research on the fouling has been tak en since 1920s, however, until now the fouling in he at exchangers is still an unsolved problem.
– So it’s of great significance to find new methods to i mprove the fouling resistance of the heat exchangers . economically, it’s of great benefits. Copyright © by ARTCOM PT All rights reserved.
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Background
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Country UK USA Germany Japan New Zealand Australia Fouling loss/ billion $ 64.3
349.5
82.0
132.3
1.5
11.2
GNP/ billion $ 25700 139800 32800 52900 1020 7460 Percentage/% 0.25
0.25
0.25
0.25
0.15
0.15
In China, just the loss results from fouling in ther mal power is over 0.1
％ of GNP.
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Background
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Logo physical means chemical means surface engineeri ng technology Mechanical Cleaning Online mechanical cle aning scale inhibitors Chemical cleani ng agents
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Background
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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.
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current work
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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 th e fouling solution of CaSO 4 .
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current work
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– Shigehito Deki prepared TiO 2 films on the glass subs trate with LPD method.
– Zeng zhenou prepared uniform and compact TiO 2 ating surface on the 304 stainless steel.
co – It can be known from the literatures that TiO g surface shows high fouling resistance and anti-corr osion performance. 2 coatin Copyright © by ARTCOM PT All rights reserved.
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current work
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– On the basis of the former research, prepared TiO2 FPS composite coatings using fluoroalkylsilane.
CF 3 (CF 2 ) 7 (CH 2 ) 2 Si(OCHCH 3 ) 3 CH 3 The composite films have a ver y low surface free energy and s how hydrophobic properties.
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current work
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The anatase tita nia coatings are prepared on the substrate with L PD method
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The titania coati ngs are dipped w ith FPS solution to prepare the co mposite hydroph obic coatings (Ti O 2 -FPS).
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Test the anti-cor rosion performa nce and fouling r esistance perfor mance.
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current work – Experiment process
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– Firstly, the stainless steel are polished and then ultra sonic cleaning with 10% NaOH solution, absolute al cohol and de-ionized water successively.
– Prepare deposition solution with (NH4) 2 TiF 6 BO 3 and use LPD method to prepare TiO 2 and H 3 coating. A fter deposited for a certain time, the stainless steel was heat treated .
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current work – Experiment process
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– The prepared TiO nto the FPS solution for 2-3h and heat treated at 150 ℃ to prepare TiO 2 2 coating surface was then dipped i -FPS composite coatings. Surface prepared by this method shows high hydrophobic.
– Test the performance of the TiO 2 and the composite hydrophobic coatings in the pool boiling system.
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current work
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Hydrolysis reaction Adsorption and dehydration with titania substrate Polycondensation of FPS Copyright © by ARTCOM PT All rights reserved.
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Next plan Next plan
Continue the coating surface preparing and pool boiling heat exchange experiment.
Attempt to enhance the anti-corrosion and foulin g resistance performance of the coatings.
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Thanks for your attent ion
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