A new approach to estimate parameters of a lumped kinetic model for hydroconversion of heavy residue

Asaee, Seyed Danial Seyed; Vafajoo, Leila; Khorasheh, Farhad

doi:10.1016/j.fuel.2014.05.079

Cited by 27 publications

(28 citation statements)

References 16 publications

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“…The inclusion of the recycle of PBFO does not improve the accuracy of prediction that suggests that it does not have impact on H-Oil ® diesel cetane index. The diesel fraction is difficult to crack at the hydrocracking conditions, although its secondary hydrocracking is documented in several researches [18][19][20][21]. The fact that the H-Oil ® diesel cetane index decreases with augmentation of reaction temperature and extending of reaction time (feed through-put reduction) suggests that the diesel may undergo secondary cracking reactions which reduce the aliphatic hydrocarbons content in the diesel and increase the aromatics content.…”

Section: Resultsmentioning

confidence: 99%

Crude Slate, FCC Slurry Oil, Recycle, and Operating Conditions Effects on H-Oil® Product Quality

et al. 2021

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This paper evaluates the influence of crude oil (vacuum residue) properties, the processing of fluid catalytic cracking slurry oil, and recycle of hydrocracked vacuum residue diluted with fluid catalytic cracking heavy cycle oil, and the operating conditions of the H-Oil vacuum residue hydrocracking on the quality of the H-Oil liquid products. 36 cases of operation of a commercial H-Oil® ebullated bed hydrocracker were studied at different feed composition, and different operating conditions. Intercriteria analysis was employed to define the statistically meaningful relations between 135 parameters including operating conditions, feed and products characteristics. Correlations and regression equations which related the H-Oil® mixed feed quality and the operating conditions (reaction temperature, and reaction time (throughput)) to the liquid H-Oil® products quality were developed. The developed equations can be used to find the optimal performance of the whole refinery considering that the H-Oil liquid products are part of the feed for the units: fluid catalytic cracking, hydrotreating, road pavement bitumen, and blending.

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Section: Resultsmentioning

confidence: 99%

Crude Slate, FCC Slurry Oil, Recycle, and Operating Conditions Effects on H-Oil® Product Quality

et al. 2021

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“…In the current work, a differential evolution variant called composite differential evolution (CoDE) is employed as the optimizer in the operational optimization. Using sensitivity analysis to assess whether an optimized solution is the global optimum is recommended in other reports. , A demo of the sensitivity analysis of two variables is given in Figure , where all perturbations in all variables giving the maximum (for maximizing problem) of the objective value at 0% perturbation indicates that the global optimum has been achieved, as shown in Figure a; otherwise, the global optimum has not been achieved, as shown in Figure b. It should be clarified that what is global is the optimized solution, not the sensitivity analysis, which is local .…”

Section: Experiments Preparations and Parameter Settingsmentioning

confidence: 99%

Adaptive Weighted Hybrid Modeling of Hydrocracking Process and Its Operational Optimization

Song

Fan

et al. 2021

Ind. Eng. Chem. Res.

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Hybrid modeling, aiming to integrate the advantages of both first-principles models and data-driven models, is an important technology for refinery process simulation and optimization. The commonly used hybrid models include series models, parallel models, and series−parallel models. Many studies have reported the operational optimization results based on these models. However, it is unknown whether the results obtained based on these models are consistent with the actual plant optimal operation. Moreover, the hybrid models that have been used in operational optimization are of traditional structures and cannot ensure competent performance. To fill these gaps, we investigate the modeling and operational optimization of a typical refinery unit hydrocracking unit. First, we establish a first-principles model, a data-driven model, and three hybrid models and analyze the strengths and weaknesses of these models. Next, we propose the concepts of "mechanism-dominated models" and "data-dominated models" to classify the existing models according to the prediction abilities instead of the structural features. Furthermore, a novel type of hybrid model termed adaptive weighted hybrid model (AWHM) is proposed to gain a better balance between extrapolation and interpolation capabilities. Then, the performance of the operational optimization based on these models is compared under four optimization scenarios. Experimental results demonstrate that the two variants of the proposed AWHM have the best optimization performance and their optimization results are the most consistent with the actual process.

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“…51 3 The temperature profile is constant within the catalytic pellet (homogeneous catalytic particle). 4 The feedstock completely vaporized before entering the catalyst bed. Based on the above assumptions, mass and energy balances for the gas and solid phases are expressed as follows:…”

Section: Parameter Estimationmentioning

confidence: 99%

“…Due to the rapid growth in the demand for high-value and more efficient petroleum products during the past decades, numerous technologies have been developed for upgrading heavier oil fractions into lighter and more valuable cleaner products. , Besides, as reported by the International Energy Agency (IEA), most recently explored petroleum reservoirs have provided heavier and inferior crude oils and the conventional crude oils are decreasing. − In addition to producing light hydrocarbons, the purpose of upgrading the heavier fractions is reduction of the viscosity and boiling point, demetalation, desulfurization, decrease the level of other impurities, and increase the H/C ratio with high commercial values . The main technologies for converting the heavy hydrocarbons are thermal cracking, catalytic cracking, , and catalytic hydrocracking. , Among them, catalytic cracking can be utilized for upgrading a variety of heavier feedstocks from straight-run gas oil, vacuum gas oil, atmospheric residuum, and vacuum residuum without high-temperature or high-pressure hydrogen requirements .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Heat and Mass Transfer and Parametric Sensitivity in an Experimental Fixed-Bed Reactor for the Catalytic Cracking of Heavy Hydrocarbons Based on Modeling and Experiments

Nargessi

Karimzadeh

2021

Ind. Eng. Chem. Res.

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A heterogeneous model for a fixed-bed catalytic cracking reactor of a heavy hydrocarbon stream based on a six-lump kinetic model has been developed for analyzing the operating parameters and describing the heat and mass transfer inside the reactor. Various definitions for the heat-transfer coefficient were investigated using the model. A comparison of the internal and external heat transfer of the reactor showed that it is limited by the heat transfer between the reactor wall and the fluid and plays a major role in the overall heat-transfer coefficient. Also, the weight fraction and temperature profiles demonstrate the same behavior for both solid and gas phases and the difference between the profiles was related to film resistance between the two phases. The results of the model at different temperatures, weight hourly space velocities, and time-on-stream on the distribution of catalytic products and conversion show good agreement with experimental data. The results revealed that moderate conditions are optimal for achieving a higher yield of gasoline, while the amount of undesirable products increased under severe conditions.

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A new approach to estimate parameters of a lumped kinetic model for hydroconversion of heavy residue

Cited by 27 publications

References 16 publications

Crude Slate, FCC Slurry Oil, Recycle, and Operating Conditions Effects on H-Oil® Product Quality

Crude Slate, FCC Slurry Oil, Recycle, and Operating Conditions Effects on H-Oil® Product Quality

Adaptive Weighted Hybrid Modeling of Hydrocracking Process and Its Operational Optimization

Analysis of Heat and Mass Transfer and Parametric Sensitivity in an Experimental Fixed-Bed Reactor for the Catalytic Cracking of Heavy Hydrocarbons Based on Modeling and Experiments

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