Effect of modelling pressure gradient in the simulation of industrial FCC risers

León-Becerril, Elizabeth; Maya-Yescas, Rafael; Salazar-Sotelo, Daniel

doi:10.1016/j.cej.2004.03.001

Cited by 16 publications

(15 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is one of the reasons for gasoline yield to increase with increase in C/O ratio. This variation of the C/O ratio, a major influence on the FCC unit, follows a typical FCC riser behaviour (León-Becerril et al, 2004, John et al, 2017b.…”

Section: Resultsmentioning

confidence: 63%

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

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.

show abstract

Section: Resultsmentioning

confidence: 63%

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

show abstract

“…y gl min is the minimum value of gasoline to be maintained while propylene is maximized. The boundaries for the mass flow rates of gas oil and catalyst are chosen such that it reflects the typical industrial FCC unit limits for C/O ratios of 4:1-10:1 by weight [48], Sadeghbeigi [49], [9]. C/O ratios for propylene production in high severity units and riser-downer are higher [18] than the C/O ratios used in conventional FCC units, which vary between 1 and 6 [16,29,50] (68)…”

Section: Optimization Problem Statementmentioning

confidence: 99%

Maximization of propylene in an industrial FCC unit

2018

View full text Add to dashboard Cite

The FCC riser cracks gas oil into useful fuels such as gasoline, diesel and some lighter products such as ethylene and propylene, which are major building blocks for the polyethylene and polypropylene production. The production objective of the riser is usually the maximization of gasoline and diesel, but it can also be to maximize propylene. The optimization and parameter estimation of a six-lumped catalytic cracking reaction of gas oil in FCC is carried out to maximize the yield of propylene using an optimisation framework developed in gPROMS software 5.0 by optimizing mass flow rates and temperatures of catalyst and gas oil. The optimal values of 290.8 kg/s mass flow rate of catalyst and 53.4 kg/s mass flow rate of gas oil were obtained as propylene yield is maximized to give 8.95 wt%. When compared with the base case simulation value of 4.59 wt% propylene yield, the maximized propylene yield is increased by 95%.

show abstract

“…Maintaining an efficient pressure gradient in the riser is a measure of good riser hydrodynamics that tends to improve product yield. A detailed model of the FCC can capture all the aspects of the unit that improves on the prediction of the performance of FCC risers (León-Becerril et al 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Since these changes in the operating conditions of the riser are taken into account when modelling risers (León-Becerril et al 2004), the variation in the compressibility factor of the fluid needs to be considered too. One major operating determinant of the FCC unit is the catalyst circulation between the riser and regenerator, and it accomplishes two simple purposes: preserving the regenerated catalyst activity via regeneration and upholding the heat balance by the endothermic reactions in the riser and other forms of heat removal.…”

Section: Introductionmentioning

confidence: 99%

Effects of compressibility factor on fluid catalytic cracking unit riser hydrodynamics

John

Patel

Mujtaba

2018

Fuel

View full text Add to dashboard Cite

A detailed steady state FCC riser process model is simulated for the first time with different compressibility (Z) factor correlations using gPROMS software. A 4-lump kinetic model is used where gas oil cracks to form gasoline, coke and gases. The usual practice has been the assumption that the FCC riser gas phase is an ideal gas at every point under any condition (varying C/O ratio, riser diameter, operating temperature and pressure, etc.). This work found that the Z factor varies at every point across the riser height depending on riser operating pressure and temperature, diameter and C/O ratio. It also shows that the magnitude of deviation of a gas phase from ideal gas behaviour can be measured over the riser height. The Z factor correlation of Heidaryan et al., (2010a) is found to be suitable for predicting the Z factor distribution in the riser.

show abstract

Effect of modelling pressure gradient in the simulation of industrial FCC risers

Cited by 16 publications

References 19 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

Maximization of propylene in an industrial FCC unit

Effects of compressibility factor on fluid catalytic cracking unit riser hydrodynamics

Contact Info

Product

Resources

About