Degradation Study of Heat Exchangers

Addepalli, Sri; Eiroa, David; Lieotrakool, Suphansa; François, Anne-Laure; Guisset, Juliette; Sanjaime, David; Kazarian, Michele; Duda, Julia; Roy, Rajkumar; Phillips, Paul S

doi:10.1016/j.procir.2015.07.057

Cited by 25 publications

(14 citation statements)

References 20 publications

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“…The framework was applied to a bespoke heat exchanger (HEx) test rig consisting of a hot closed loop system and a cold open loop system, as designed by Addepalli et al [6], illustrated in Fig. 2.…”

Section: Case Study: Heat Exchanger Test Rigmentioning

confidence: 99%

“…2. Oil-air heat exchanger rig design [6] Recordings were taken once the system had reached operating temperature, 80°C, at steady state. 6 sets of 10 recordings were made for each parameter with 20 minute intervals between each set to allow the temperature to reset.…”

Section: Case Study: Heat Exchanger Test Rigmentioning

confidence: 99%

“…Details of framework development are described in Section 3 along with key mathematical formulae, functions and assumptions made. Section 4 applies the framework to a case study utilising a bespoke heat exchanger test rig developed at Cranfield University [6]. Individual uncertainties from quantitative and qualitative sources are assessed and aggregated to give a confident indication of system performance.…”

Section: Introductionmentioning

confidence: 99%

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An Uncertainty Quantification and Aggregation Framework for System Performance Assessment in Industrial Maintenance

et al. 2020

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The exponential increase in technological complexity of modern engineering systems necessitates rigorous and accurate maintenance planning to determine optimum equipment availability and turnaround time whilst allowing for overruns and unforeseen costs. Quality and availability of quantitative data, as well as qualitative expert opinion and experience expose uncertainties that can result in under or over estimation of the above factors. Uncertainty quantification in complex engineering systems should consider interconnected components and associated processes from a combination of quantitative and qualitative (compound) perspectives. This paper presents a framework to quantify and aggregate compound uncertainties and to be assessed against a predetermined acceptable level of uncertainty. This will provide maintenance planners with a confident, comprehensive view of parameters surrounding the above factors to improve decision making capabilities. The framework was validated by assessing individual and compound uncertainties in a bespoke heat exchanger test rig comprised of subsystem modules interact in a non-linear manner, as well as subjective opinions and actions of operators. The results demonstrate the framework's ability to effectively quantify these factors with an indication of their impact on the system. Future work will include further validation with more complex case studies and development of methods to forecast the quantified uncertainty through the in-service phase of an asset's life cycle.

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Section: Case Study: Heat Exchanger Test Rigmentioning

confidence: 99%

Section: Case Study: Heat Exchanger Test Rigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Uncertainty Quantification and Aggregation Framework for System Performance Assessment in Industrial Maintenance

et al. 2020

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“…Although it has also been reported that oxygen can sometimes play a protective role on the heat recovery equipment, by creating a passive film. However, at high temperatures this protective film is more likely to break down due to the lower rate of oxygen solubility [21]. Silicon (Si) was found in significant concentration (19 wt %) as compared to sulphur (S), which was presented the lowest concentration (0.13 wt %).…”

Section: Morphology and Elemental Composition Of Carbon Particlesmentioning

confidence: 99%

Analytical and Thermal Evaluation of Carbon Particles Recovered at the Cyclone of a Downdraft Biomass Gasification System

2017

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Gasification of biomass gives off syngas that is contaminated mostly by carbon particulates and tars. The degree of contamination is attributed to factors such as gasification process, type of gasifier and type of biomass material. Downdraft gasifier minimizes the production of tar to a tolerable limit for engine applications; however, carbon particles still pose a challenge particularly with the integration of a heat exchanger for the purpose of heat recovery from the product gas. The presence of carbon particles in the syngas does influence the heat recovery process and materials used in the recovery. Hence, there is need for the characterization of these carbon particles to ascertain their chemical compositions, thermal properties and morphological features. This study was aimed at evaluating the characteristic features of carbon particles recovered from the syngas stream during gas cleaning at the cyclone. The elemental analysis of the carbon particle samples was performed using energy dispersive X-ray spectroscopy. An electron beam from scanning electron microscopy was passed through the sample surface at a magnification of 1000x and an accelerating voltage of 15 kV to determine the morphological features of the carbon particles. Their thermal properties were investigated using a thermogravimetric analyzer at a heating rate of 10 • C/min. A weight loss of approximately 5.4 wt % was recorded at the maximum temperature of 900 • C. Silicon, oxygen and carbon were found to be the dominating elements in the carbon particulate.

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“…There are three main failure mechanisms of a heat exchanger: leakages, blocking due to deposits, and material thinning [7]. The main reasons for material thinning are erosion and corrosion.…”

Section: Introductionmentioning

confidence: 99%

Study of Corrosion Resistance Properties of Heat Exchanger Metals in Two Different Geothermal Environments

Davíđsdóttir¹,

Gunnarsson²,

Kristjánsson³

et al. 2021

Geosciences

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Geothermal fluids harnessed for electricity production are generally corrosive because of their interaction with the underground. To ensure the longevity and sustainability of geothermal Organic Rankine Cycle (ORC) powerplants, the choice of heat exchanger material is essential. The performance of heat exchangers is affected by corrosion and scaling due to the geothermal fluids, causing regular cleaning, part replacement, and in the worst cases, extensive repair work. The properties of geothermal fluids vary between geothermal settings and even within geothermal sites. Differences in exposure conditions require different material selection considerations, where factors such as cost, and material efficiency are important to consider. This work studies in-situ geothermal exposure testing of four metals at two geothermal locations, in different geological settings. Four corrosion-resistant materials were exposed for one month at Reykjanes powerplant in Iceland and four months at Chaunoy oil field in France as material candidates for heat exchangers. The tested alloys were analysed for corrosion with macro- and microscopic techniques using optical and electron microscopes, which give an indication of the different frequencies of repairs and replacement. Inconel 625 showed no effects at Reykjanes and cracks at Chaunoy. The others (316L, 254SMO, and titanium grade 2) showed either corrosion or erosion traces at both sites.

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Degradation Study of Heat Exchangers

Cited by 25 publications

References 20 publications

An Uncertainty Quantification and Aggregation Framework for System Performance Assessment in Industrial Maintenance

An Uncertainty Quantification and Aggregation Framework for System Performance Assessment in Industrial Maintenance

Analytical and Thermal Evaluation of Carbon Particles Recovered at the Cyclone of a Downdraft Biomass Gasification System

Study of Corrosion Resistance Properties of Heat Exchanger Metals in Two Different Geothermal Environments

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