Why FCC riser is taller than model predictions?

Kumar, Vineet; Reddy, A. Sai Krishna

doi:10.1002/aic.12499

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…This could be due to the complexity of the riser's feed which is a complex mixture of extremely large number of unknown compounds. Also, there is the complex hydrodynamics of the riser owing to the three phases (solid, liquid and gas) nature along with gas phase volume expansion due to vaporization and cracking reaction (Kumar and Reddy, 2011). The challenge with the cracking reaction is its characterization.…”

Section: Kinetic Modelling and Model Parametersmentioning

confidence: 99%

Parameter estimation of a six-lump kinetic model of an industrial fluid catalytic cracking unit

John

Mustafa

Patel

et al. 2019

Fuel

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In this work a simulation of detailed steady state model of an industrial fluid catalytic cracking (FCC) unit with a newly proposed six-lumped kinetic model which cracks gas oil into diesel, gasoline, liquefied petroleum gas (LPG), dry gas and coke. Frequency factors, activation energies and heats of reaction for the catalytic cracking kinetics and a number of model parameters were estimated using a model based parameter estimation technique along with data from an industrial FCC unit in Sudan. The estimated parameters were used to predict the major riser fractions; diesel as 0.1842 kg-lump/kg-feed with a 0.81% error while gasoline as 0.4863 kg-lump/kg-feed with a 2.71% error compared with the plant data. Thus, with good confidence, the developed kinetic model is able to simulate any type of FCC riser with six-lump model as catalyst-to-oil (C/O) ratios were varied and the results predicted the typical riser profiles.

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Section: Kinetic Modelling and Model Parametersmentioning

confidence: 99%

Parameter estimation of a six-lump kinetic model of an industrial fluid catalytic cracking unit

John

Mustafa

Patel

et al. 2019

Fuel

View full text Add to dashboard Cite

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“…After the rise, the increase in conversion becomes sluggish in the dilute‐phase zone. As discussed by Kumar and Reddy, fitting Derouin et al's data is a nontrivial task. Figure shows that the three models predict very different product yields (wt %) and the concentrations of unconverted VGO.…”

Section: Model Validationmentioning

confidence: 99%

A two‐zone model for fluid catalytic cracking riser with multiple feed injectors

Zhu

Ho³

2014

AIChE Journal

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Developments in modeling of the fluid catalytic cracking (FCC) process have progressed along two lines. One emphasizes composition-based kinetic models based on molecular characterization of feedstocks and reaction products. The other relies on computational fluid dynamics. The aim is to develop an FCC model that strikes a balance between the two approaches. Specifically, we present an FCC riser model consisting of an entrance-zone and a fully developed zone. The former has four overlapping, fan-shaped oil sprays. The model predicts the plant data of Derouin et al. and reveals an inherent two-zone character of the FCC riser. Inside the entrance zone, cracking intensity is highest and changes rapidly, resulting in a steep rise in oil conversion. Outside the entrance zone, cracking intensity is low and varies slowly, leading to a sluggish increase in conversion. The two-zone model provides a computationally efficient modeling approach for FCC online control, optimization, and molecular management.

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Modeling Refining Processes

2017

Springer Handbook of Petroleum Technology

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Why FCC riser is taller than model predictions?

Cited by 4 publications

References 17 publications

Parameter estimation of a six-lump kinetic model of an industrial fluid catalytic cracking unit

Parameter estimation of a six-lump kinetic model of an industrial fluid catalytic cracking unit

A two‐zone model for fluid catalytic cracking riser with multiple feed injectors

Modeling Refining Processes

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