Experimental study of calcium sulfate fouling in a heat exchanger during liquid-solid fluidized bed with cylindrical particles

Maddahi, Mohammad Hossein; Hatamipour, Mohammad Sadegh; Jamialahmadi, M.

doi:10.1016/j.ijthermalsci.2017.11.007

Cited by 19 publications

(6 citation statements)

References 16 publications

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“…Recently, a favourable option for systems heavily prone to fouling has been the use of a liquid-solid fluidized bed heat exchanger, where fluidized particles are continuously hitting the walls and removing deposits. Maddahi et al [103] studied CaSO 4 fouling in one such HE, while comparing it to a commonly used forced convective heat transfer. Heat transfer coefficient was significantly increased in this type of HE, while fouling was noticeably reduced due to the particle-wall collisions.…”

Section: Fouling Inhibition and Cleaningmentioning

confidence: 99%

A Review of Crystallization Fouling in Heat Exchangers

et al. 2021

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A vast majority of heat exchangers suffer from unwanted deposition of material on the surface, which severely inhibits their performance and thus marks one of the biggest challenges in heat transfer. Despite numerous scientific investigations, prediction and prevention of fouling remain unresolved issues in process engineering and are responsible for large economic losses and environmental damage. This review article focuses specifically on crystallization fouling, providing a comprehensive overview of the state-of-the-art of fouling in heat exchangers. The fundamentals of the topic are discussed, as the term fouling resistance is introduced along with distinct fouling behaviour, observed in laboratory and industrial environments. Insight into subsequent phases of the fouling process is provided, along with the accompanying microscale events. Furthermore, the effects of fluid composition, temperature, flow velocity, surface condition, nucleate boiling and composite fouling are comprehensively discussed. Fouling modelling is systematically reviewed, from the early work of Kern and Seaton to recently used artificial neural networks and computational fluid dynamics. Finally, the most common fouling mitigation approaches are presented, including design considerations and various on-line strategies, as well as off-line cleaning. According to our review, several topics require further study, such as the initial stage of crystal formation, the effects of ageing, the interplay of two or more fouling mechanisms and the underlying phenomena of several mitigation strategies.

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Section: Fouling Inhibition and Cleaningmentioning

confidence: 99%

A Review of Crystallization Fouling in Heat Exchangers

et al. 2021

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“…CaCO 3 solution is heated after until temperature range of fouling deposition is 328 ± 1 K through the heat transfer of the wall of the inner tube in the measurable anti-fouling heat exchanger temperature. Logarithmic mean temperature difference (LMTD) of measurable anti-fouling heat exchanger is calculated according to the Equation [2].…”

Section: Surface Morphology and Microstructurementioning

confidence: 99%

“…where A' is the heat transfer area of inner tube of measurable anti-fouling heat exchanger, m 2 . Figure 9b displays the heat transfers coefficient change of the measurable anti-fouling heat exchanger.…”

Section: Heat Transfer Behaviormentioning

confidence: 99%

“…The fouling problem, which is regarded as "the main unresolved problem in heat transfer", is mainly generated by the deposition of particulates, impurities, salts, and various organic species onto heat transfer surfaces [1][2][3]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the evidence demonstrates that the induction period of fouling can be effectively prolonged by the surface free energy of coating. Solubility of calcium carbonate reduces with the up of solution temperature, and the studies prove that the dissolved metal cation can further accelerate the deposition process of fouling [2,21,22]. From the preceding decades, the nucleation of CaCO 3 molecules have been studied theoretically based on molecular dynamics (MD) and density functional theory (DFT).…”

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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Growth Period in Crystallization Fouling

Varnaseri,

Peyghambarzadeh

2024

Scale Formation in Heat Exchangers

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Experimental study of calcium sulfate fouling in a heat exchanger during liquid-solid fluidized bed with cylindrical particles

Cited by 19 publications

References 16 publications

A Review of Crystallization Fouling in Heat Exchangers

A Review of Crystallization Fouling in Heat Exchangers

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

Growth Period in Crystallization Fouling

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