Experimental study on the anti-fouling effects of Ni–Cu–P-PTFE deposit surface of heat exchangers

Cheng, Yanhai; Chen, H.Y.; Zhu, Zhen; Jen, Tien-Chien; Peng, Yuxing

doi:10.1016/j.applthermaleng.2014.04.003

Cited by 47 publications

(20 citation statements)

References 21 publications

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“…To achieve this goal, an anti-fouling coating can be applied on the heat transfer surfaces. Many researches attest in particular the effectiveness of hydrophobic coatings on mitigation of crystallization fouling in heat exchangers [4][5][6][7]. Crystallization fouling is one of the most common types of fouling involving heat exchangers and consists in the precipitation and deposition of dissolved salts, after the supersaturation [8].…”

Section: Introductionmentioning

confidence: 99%

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Oldani

Sergi

Pirola

et al. 2016

Applied Thermal Engineering

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The technology of the organic/inorganic hybrid coating was employed in the preparation of a hydrophobic coating (contact angle higher than 140°) for fouling mitigation on stainless steel heat transfer surfaces. A commercial triethoxysilane perfluoropolyethers was combined with a sol-gel silica network with the aim to increase the mechanical and thermal resistance of the films when exposed to aggressive liquid environments as the heat exchanging fluids. The experimentation on a shell and tube heat exchanger pilot plant confirmed the ability of the hybrid coating to prolong the crystallization fouling induction period of 200 h in respect to an uncoated heat exchanger, operating in the same conditions. Moreover, the fouling particles deposited on the coated heat transfer surfaces had only slight adhesion strength toward the coated surfaces and were easily removed by inducing higher wall shear stresses inside the tubes of the plant.

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Section: Introductionmentioning

confidence: 99%

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Oldani

Sergi

Pirola

et al. 2016

Applied Thermal Engineering

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“…Substantially, the change process of fouling resistance R is further calculated with Equation (10). Compare the changes of fouling resistance of the specimen with or without Ni-W-P coating after fouling, the heat transfer coefficient K [32] can be obtained from = / (11) After that, crystal shape and thermal resistance of fouling layer were analyzed. To avoid the fouling solution deposited on the inner surfaces of pipeline, reduce errors in the experiment, maintain the heat transfer effect of the inner tube, this heat exchanger is made of stainless steel in this experiment [28].…”

Section: Recordingmentioning

confidence: 99%

“…The results prove that electroless Ni-P-based coating is an advantageous method for fouling inhibition [9][10][11][12][13]. The mass gain method [10,11,14], the calcium ion loss method [12], and the fouling resistance method [15] were commonly used for measuring the deposition process of calcium carbonate fouling on materials surface. The surface is easy to be corroded and the oxidized surface is prone to form a "transition interface", which works as a "bridge" to connect the matrix and fouling.…”

Section: Introductionmentioning

confidence: 97%

“…It can be seen from Figure 1 that the fouling of calcium carbonate Since the 1980s, electroless plating has been treated as an operational technology of the surface modification, attracting widespread attention [4][5][6][7][8]. The results prove that electroless Ni-P-based coating is an advantageous method for fouling inhibition [9][10][11][12][13]. The mass gain method [10,11,14], the calcium ion loss method [12], and the fouling resistance method [15] were commonly used for measuring the deposition process of calcium carbonate fouling on materials surface.…”

Section: Introductionmentioning

confidence: 99%

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Study on Heat Transfer Performance and Anti-Fouling Mechanism of Ternary Ni-W-P Coating

et al. 2020

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Since the formation of fouling reduces heat transfer efficiency and causes energy loss, anti-fouling is desirable and may be achieved by coating. In this work, a nickel-tungsten-phosphorus (Ni-W-P) coating was prepared on the mild steel (1015) substrate using electroless plating by varying sodium tungstate concentration to improve its anti-fouling property. Surface morphology, microstructure, fouling behavior, and heat transfer performance of coatings were further reported. Also, the reaction path, transition state, and energy gradient change of calcite, aragonite, and vaterite were also calculated. During the deposition process, as the W and P elements were solids dissolved in the Ni crystal cell, the content of Ni element was obviously higher than that of the other two elements. Globular morphology was evenly covered on the surface. Consequently, the thermal conductivity of ternary Ni-W-P coating decreases from 8.48 W/m·K to 8.19 W/m·K with the increase of W content. Additionally, it goes up to 8.93 W/m·K with the increase of heat source temperature 343 K. Oxidation products are always accompanied by deposits of calcite-phase CaCO3 fouling. Due to the low surface energy of Ni-W-P coating, Ca2+ and [CO3]2− are prone to cross the transition state with a low energy barrier of 0.10 eV, resulting in the more formation of aragonite-phase CaCO3 fouling on ternary Ni-W-P coating. Nevertheless, because of the interaction of high surface energy and oxidation products on the bare matrix or Ni-W-P coating with superior W content, free Ca2+ and [CO3]2− can be easy to nucleate into calcite. As time goes on, the heat transfer efficiency of material with Ni-W-P coating is superior to the bare surface.

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“…Many attempts have been made to reduce crystalline fouling and biofouling via the application of surface coatings. Cheng et al (2014) demonstrated that the addition of PTFE to the Ni-Cu-P composite coating inhibits mineral fouling accumulation. Zhao et al (2005) also demonstrated that the Ni-Cu-P-PTFE composite coating inhibits both biofouling and mineral fouling on heat exchanger surfaces.…”

Section: Introductionmentioning

confidence: 99%

Reduction of dust deposition in air-cooled condensers in thermal power plants by Ni–P-based coatings

Zhao

Wang

Xu³

et al. 2021

Clean Techn Environ Policy

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One of the largest problems with most current thermal power plants is the cooling efficiency. This paper aims to massively reduce fuel consumption and heat wasted in thermal power plants and hence CO2 emissions by resolving fouling issues associated with air-cooled condensers. In order to reduce the dust fouling deposition in the air-cooled condensers, the finned flat tubes were coated with nickel−phosphorus and nickel−phosphorus−polytetrafluoroethylene (Ni–P-PTFE) by an electroless coating technology. The anti-fouling performance of the coated tubes was investigated using the field operation parameters of air-cooled condensers, and the influence of the surface energies of the coatings on the dust adhesion was also investigated. The results demonstrated that the Ni–P coated finned tubes performed best, which reduced fouling resistance by 83.3% compared with the untreated finned tubes. The Ni–P coatings have potential applications in thermal power plants for reducing heat exchanger fouling and hence significantly decreasing waste heat and CO2 emissions. Graphic abstract

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Experimental study on the anti-fouling effects of Ni–Cu–P-PTFE deposit surface of heat exchangers

Cited by 47 publications

References 21 publications

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Use of a sol-gel hybrid coating composed by a fluoropolymer and silica for the mitigation of mineral fouling in heat exchangers

Study on Heat Transfer Performance and Anti-Fouling Mechanism of Ternary Ni-W-P Coating

Reduction of dust deposition in air-cooled condensers in thermal power plants by Ni–P-based coatings

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