Failure mechanism of a coil type crude oil heater and optimization method

Guo, Lei; Kuang, Jing; Liu, Songbo; Shen, Sujie; Liang, Liang

doi:10.1016/j.csite.2022.102398

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…Concerning downhole stability, combustion heaters significantly lag behind electric heaters [14,15]. Consequently, electric heaters are the more prevalent choice in the in situ conversion process [16,17].…”

Section: Introductionmentioning

confidence: 99%

Numerical Heat Transfer Simulation of Oil Shale Large-Size Downhole Heater

Bu,

Li,

2024

Applied Sciences

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Downhole heaters are critical for effectively achieving in situ oil shale cracking. In this study, we simulate the heat transfer performance of a large-scale helical baffle downhole heater under various operational conditions. The findings indicate that at 160 m3/h and 6 kW the outlet temperature can reach 280 °C. Controlling heating power or increasing the injected gas flow effectively mitigates heat accumulation on the heating rod’s surface. The outlet temperature curve exhibits two phases. Simultaneously, a balance in energy exchange between the injected gas and heating power occurs, mitigating high-temperature hotspots. Consequently, the outlet temperature cannot attain the theoretical maximum temperature, referred to as the actual maximum temperature. Employing h/∆p13 as the indicator to evaluate heat transfer performance, optimal performance occurs at 100 m3/h. Heat transfer performance at 200 m3/h is significantly impacted by heating power, with the former being approximately 6% superior to the latter. Additionally, heat transfer performance is most stable below 160 m3/h. The gas heating process is categorized into three stages based on temperature distribution characteristics within the heater: rapid warming, stable warming, and excessive heating. The simulation findings suggest that the large-size heater can inject a higher flow rate of heat-carrying gas into the subsurface, enabling efficient oil shale in situ cracking.

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Section: Introductionmentioning

confidence: 99%

Numerical Heat Transfer Simulation of Oil Shale Large-Size Downhole Heater

Bu,

Li,

2024

Applied Sciences

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“…To improve profitability, refineries are trying to process blends resembling in their properties the design crude, which contain one or more cheaper crudes (opportunity crudes) [11]. The processing of petroleum mixtures can be accompanied by operational problems related to accelerated fouling [12][13][14], corrosion [15][16][17][18][19][20], equipment failure [21], catalyst deactivation [22][23][24], etc. Thus, the assumption that a refinery can refine economically favourable, environmentally friendly, and reliable petroleum crude blends whose characteristics are not too far away from the designed crude may be misleading [25].…”

Section: Introductionmentioning

confidence: 99%

Experience in Processing Alternative Crude Oils to Replace Design Oil in the Refinery

Stratiev,

Shiskova,

Toteva

et al. 2024

Resources

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A comprehensive investigation of a highly complex petroleum refinery (Nelson complexity index of 10.7) during the processing of 11 crude oils and an imported atmospheric residue replacing the design Urals crude oil was performed. Various laboratory oil tests were carried out to characterize both crude oils, and their fractions. The results of oil laboratory assays along with intercriteria and regression analyses were employed to find quantitative relations between crude oil mixture quality and refining unit performance. It was found that the acidity of petroleum cannot be judged by its total acid number, and acid crudes with lower than 0.5 mg KOH/g and low sulphur content required repeated caustic treatment enhancement and provoked increased corrosion rate and sodium contamination of the hydrocracking catalyst. Increased fouling in the H-Oil hydrocracker was observed during the transfer of design Urals crude oil to other petroleum crudes. The vacuum residues with higher sulphur, lower nitrogen contents, and a lower colloidal instability index provide a higher conversion rate and lower fouling rate in the H-Oil unit. The regression equations developed in this work allow quantitative assessment of the performance of crucial refining units like the H-Oil, fluid catalytic cracker, naphtha reformer, and gas oil hydrotreatment based on laboratory oil test results.

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Flow coupling analysis and evaluation of different working conditions for crude oil storage tanks under dynamic heating

Li,

Liang,

Chen

et al. 2024

Can J Chem Eng

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During periods of sharp demand increase, there is a need for significant expansion in the fundamental requirements for crude oil storage. As demand rapidly escalates, the prerequisites for crude oil storage necessitate substantial expansion. To scientifically and effectively reduce energy waste associated with heating oil, it is essential to study the heating methods and efficiency of crude oil storage tanks. Considering environmental temperature, solar radiation, and the physical properties of the oil, we have proposed a new heating model to elucidate the dynamic heating process of large floating roof storage tanks equipped with coils. Computational fluid dynamics (CFD) software was used to analyze the impact of the dynamic heating model on the temperature and velocity fields within the floating roof tank, taking into account different initial oil temperatures, oil levels, wind speeds, and types of crude oil during the winter heating process. Additionally, the research suggests the optimal maintenance heating temperature and duration for crude oil storage tanks during the winter season, introducing heating efficiency and inhomogeneity of temperature field as two evaluation metrics to compare the advantages of the dynamic heating method over traditional heating methods. This study provides fresh insights into the coil heating domain in crude oil storage tanks.

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Failure mechanism of a coil type crude oil heater and optimization method

Cited by 4 publications

References 38 publications

Numerical Heat Transfer Simulation of Oil Shale Large-Size Downhole Heater

Numerical Heat Transfer Simulation of Oil Shale Large-Size Downhole Heater

Experience in Processing Alternative Crude Oils to Replace Design Oil in the Refinery

Flow coupling analysis and evaluation of different working conditions for crude oil storage tanks under dynamic heating

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