Effect of Asphaltene Stability on Fouling at Delayed Coking Process Furnace Conditions

Derakhshesh, Marzie; Eaton, Paul E.; Newman, Bruce A.; Hoff, Anne; Mitlin, David; Gray, Murray R.

doi:10.1021/ef301754y

Cited by 13 publications

(7 citation statements)

References 34 publications

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“…It can be seen that there is considerable These exchangers had 2 tube-passes in the original paper variation in the values so there is a need for more measurements of this thermophysical property. The low value reported by Derakshesh et al (2013) arises from the measurements being made with a heated wire operating at constant heat flux, which promoted vapourisation of the oil in the porous deposit matrix. Equation [4] indicates that this would increase the insulating nature of the deposit significantly.…”

Section: Quantifying the Impact Of Fouling-the Modified Temperature Fmentioning

confidence: 93%

“…The deposit thermal conductivity is a material parameter, which is subject to substantial uncertainty. Crude oil deposits vary in composition (oil, metal oxides, carbonaceous material; Derakshesh et al 2013) and λ c is expected to lie in the range 0. (Watkinson and Wilson 1997;Derakshesh et al 2013;Ishiyama et al 2020).…”

Section: Quantifying the Impact Of Fouling-the Modified Temperature Fmentioning

confidence: 99%

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Incorporating Deposit Ageing into Visualisation of Crude Oil Preheat Train Fouling

Ishiyama¹,

Pugh²,

Wilson

2020

Process Integr Optim Sustain

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Fouling is an acute problem in crude oil preheat train heat exchangers as it affects the thermal and hydraulic performance of individual units as well as the network. Ageing of fouling deposits complicates these interactions and effective tools for visualising these effects are needed. The modified temperature field plot construction, devised by Graham Polley and coworkers in 2002, allows the impact of fouling on pressure drop and heat duty across individual units and the preheat train to be presented in a systematic way. The simple deposit ageing model of Ishiyama et al. (AIChEJ 56:531-545, 2010a) was incorporated into the analysis of a simple preheat train based on that presented by Panchal and Huang-Fu (Heat Transfer Eng 21:3-9, 2000) to calculate the impact of ageing on fouling dynamics and network performance. The modified temperature field plot is shown to be effective in communicating the impact of fouling and ageing, allowing a designer or operator to be able to interpret correctly what might otherwise be conflicting trends or unexpected behaviour. Keywords Ageing. Fouling. Network. Pressure drop Highlights • Ageing can switch the main impact of fouling from duty loss to pressure drop. • The modified temperature field plot is an effective way of presenting the thermal and hydraulic performance of the network. • The plot allows the designer or operator to understand fouling impacts and assess mitigation options.

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Section: Quantifying the Impact Of Fouling-the Modified Temperature Fmentioning

confidence: 93%

Section: Quantifying the Impact Of Fouling-the Modified Temperature Fmentioning

confidence: 99%

Incorporating Deposit Ageing into Visualisation of Crude Oil Preheat Train Fouling

Ishiyama¹,

Pugh²,

Wilson

2020

Process Integr Optim Sustain

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“…Under actual conditions in heat transfer equipment, assessing compatibility by fouling is acceptable. Many researchers found that colloidal stability plays a key role in fouling, including Asomaning and Watkinson (2000), Saleh et al (2004), Stark and Asomaning (2003), and Derakhshesh et al (2013). Besides, Srinivasan and Watkinson (2004) stated that fouling is concerned with not only 687 FIGURE 1 Schematic diagram of the fouling loop.…”

Section: Introductionmentioning

confidence: 99%

Compatibility of Heavy Blends Evaluated by Fouling and Its Relationship With Colloidal Stability

Wang

Liu

Sun

et al. 2015

Petroleum Science and Technology

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To predict oil compatibility is crucial because incompatibility could cause severe deposition and fouling problems. Therefore, compatibility of heavy oils and blends in different ratios were evaluated by fouling at heat transfer conditions. Thermal resistance and fouling rates were obtained on a fouling loop. Effect of colloidal stability based on asphaltene precipitation and SARA composition on fouling was also discussed. Results showed that different variations of fouling rate versus blending ratio were observed for these blending systems. For oils whose viscosities approach at heat conditions, the lower colloidal stability of blends is the higher fouling rate is. However, for oils with greatly different viscosities, inconsistency was observed between compatibility by the two indicators, which is attributed to remarkable change of flow condition. This indicates that both colloidal stability and flow condition play key roles in fouling. Oil compatibility at heat transfer condition is favored being predicted by fouling instead of correlating with the colloidal stability.

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“…For instance, several studies on crude oil fouling report significant levels of inorganic material, particularly FeS, and these materials will undergo different reaction and ageing pathways to hydrocarbon only materials. For example, Derakshesh et al [17] reported appreciable levels of FeS in deposits under coking conditions and the development of a porous deposit at higher temperatures, which is attributed to subcooled boiling.…”

Section: Distributed Ageing Model (Model Ii)mentioning

confidence: 99%

“…where A is the surface area for heat transfer and W min is the smaller of the two heat capacity flow rates. For a counter current exchanger with W hot = W cold = W min , the effectiveness, , is given by (17) The effectiveness relates the actual heat duty, Q, to the thermodynamically maximum possible duty, Q max , via:…”

Section: Heat Transfer and Foulingmentioning

confidence: 99%

Aging is Important: Closing the Fouling–Cleaning Loop

Ishiyama¹,

Paterson

Wilson

2013

Heat Transfer Engineering

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Process units subject to fouling often require regular cleaning, giving rise to repeated cycles of fouling and cleaning. The initial stages of fouling are strongly influenced by the effectiveness of the most recent cleaning step and, similarly, the effectiveness and rate of cleaning is determined by the extent and nature of the deposit layer present on the surface. The optimal operating cycle will therefore be determined by fouling-cleaning interactions. Deposit ageing is an important factor in this, as an aged deposit is usually more difficult to clean. Ageing therefore introduces an element of choice into fouling-cleaning operating cycles, between in-situ 'chemical' methods and ex-situ 'mechanical' methods, with associated differences in effectiveness, time and cost. This paper reports a reformulation of the cleaning scheduling problem to consider the choice of cleaning method as well as the timing of cleaning. A case study based on a shell-and-tube heat exchanger processing crude oil is used to illustrate the concepts and scope of application of this approach. A novel and more general formulation of the problem, linking design, fouling and cost aspects via dimensionless groups is then presented and illustrated with a second case study based on a simpler exchanger model.

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Effect of Asphaltene Stability on Fouling at Delayed Coking Process Furnace Conditions

Cited by 13 publications

References 34 publications

Incorporating Deposit Ageing into Visualisation of Crude Oil Preheat Train Fouling

Incorporating Deposit Ageing into Visualisation of Crude Oil Preheat Train Fouling

Compatibility of Heavy Blends Evaluated by Fouling and Its Relationship With Colloidal Stability

Aging is Important: Closing the Fouling–Cleaning Loop

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