Concept. Fouling on heat transfer surfaces in heat exchanger is a hard problem to solve and several methods have been suggested to inhibit the deposition of scale on heat exchanger surfaces. Recently many on-line physical mitigation techniques have been developed, consisting of a modification of the interactions between fouling precursor and the heat transfer surface. One possibility is to make hydrophobic heat transfer surfaces, considering that in most cases operating fluids are water solutions. Motivations and Objectives. The scope of this work is to create a coating for stainless steel surfaces, in order to avoid any interaction of the metallic surface with armful precipitates, thus preventing the fouling in heat exchangers. Perfluoropolyethers are used to obtain a nanometer fluorinated layer, with hydrophobic properties, on stainless steel surfaces. The endurance of the coating and his influence on heat transfer has been studied by a test rig. Moreover a pilot plant with two identical heat exchangers AEW TEMA TYPE, put in parallel, was built for determining the effective anti-fouling efficiency of the hydrophobic coating. The heat transfer surfaces of only one of them were coated, in order to make a comparison about fouling behavior between the normal heat exchangers and the coated one. Results and Discussion. The experimental results demonstrate that such a coating can influence fouling rate in heat exchangers. Pilot plant was monitored for a period of five months. Fouling resistance was calculated and results show higher values for the uncoated heat exchanger than for the coated one.

Perfluoropolyethers coatings whit hydrophobic properties for fouling protection on heat transfer metal surfaces / V. Oldani, S. Biella, C.L. Bianchi, C. Pirola, G. Cattaneo. ((Intervento presentato al 9. convegno Convegno nazionale INSTM sulla scienza e tecnologia dei materiali tenutosi a Bari nel 2013.

Perfluoropolyethers coatings whit hydrophobic properties for fouling protection on heat transfer metal surfaces

V. Oldani
Primo
;
C.L. Bianchi;C. Pirola
Penultimo
;
2013

Abstract

Concept. Fouling on heat transfer surfaces in heat exchanger is a hard problem to solve and several methods have been suggested to inhibit the deposition of scale on heat exchanger surfaces. Recently many on-line physical mitigation techniques have been developed, consisting of a modification of the interactions between fouling precursor and the heat transfer surface. One possibility is to make hydrophobic heat transfer surfaces, considering that in most cases operating fluids are water solutions. Motivations and Objectives. The scope of this work is to create a coating for stainless steel surfaces, in order to avoid any interaction of the metallic surface with armful precipitates, thus preventing the fouling in heat exchangers. Perfluoropolyethers are used to obtain a nanometer fluorinated layer, with hydrophobic properties, on stainless steel surfaces. The endurance of the coating and his influence on heat transfer has been studied by a test rig. Moreover a pilot plant with two identical heat exchangers AEW TEMA TYPE, put in parallel, was built for determining the effective anti-fouling efficiency of the hydrophobic coating. The heat transfer surfaces of only one of them were coated, in order to make a comparison about fouling behavior between the normal heat exchangers and the coated one. Results and Discussion. The experimental results demonstrate that such a coating can influence fouling rate in heat exchangers. Pilot plant was monitored for a period of five months. Fouling resistance was calculated and results show higher values for the uncoated heat exchanger than for the coated one.
2013
fouling ; heat exchangers ; coating ; hydrophobic ; perfluoropolyethers
Settore CHIM/04 - Chimica Industriale
Settore ING-IND/25 - Impianti Chimici
Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM)
Perfluoropolyethers coatings whit hydrophobic properties for fouling protection on heat transfer metal surfaces / V. Oldani, S. Biella, C.L. Bianchi, C. Pirola, G. Cattaneo. ((Intervento presentato al 9. convegno Convegno nazionale INSTM sulla scienza e tecnologia dei materiali tenutosi a Bari nel 2013.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/222063
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