Gas-solid-liquid reactive CFD simulation of an industrial RFCC riser with investigation of feed injection

Chen, Sheng; Fan, Yunyun; Kang, Haoyuan; Lu, Bona; Tian, Yujie; Xie, Guoshan; Wang, Wei; Lu, Chunxi

doi:10.1016/j.ces.2021.116740

Cited by 17 publications

(15 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, the high-speed injection of oil droplets from nozzles influences the flow field therein, resulting in uneven distribution of gas, liquid, and temperatures. Chen et al [17,23] of liquid phase also displays a similar distribution of solid concentration as shown in Fig. 3, like a candle with hot ignition point at the bottom.…”

Section: Temperature Distributionsupporting

confidence: 58%

“…Chen et al. 17, 23 discuss the nozzle design and conclude that the formation of transverse force of oil jet pushes hot solid particles inwards to the center, so the temperature distribution of liquid phase also displays a similar distribution of solid concentration as shown in Fig. 3, like a candle with hot ignition point at the bottom.…”

Section: Resultsmentioning

confidence: 98%

“…Chen et al. 17 used a three‐phase Eulerian model and twelve‐lump kinetics to conduct gas‐solid‐liquid reactive simulations of an industrial residue FCC reactor to optimize the feeding nozzle. Behjat et al.…”

Section: Introductionmentioning

confidence: 99%

“…Chang et al [16] adopted the multi-Euler model combined with twelve-lump kinetics to investigate hydrodynamics, heat transfer, and cracking reactions in a heavy oil riser with bottom airlift loop mixer and found that the injection angle has a greater effect on product yield than droplet size and reaction temperature. Chen et al [17] used a threephase Eulerian model and twelve-lump kinetics to conduct gas-solid-liquid reactive simulations of an industrial residue FCC reactor to optimize the feeding nozzle. Behjat et al [14] used a hybrid Eulerian-Lagrangian method with six-lump kinetics to investigate the effect of oil droplet vaporization and reaction behavior and found that vaporization of oil droplets and cracking reactions can increase the velocity of gas-solid phases and greatly affect the temperature distribution.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Two‐Phase and Three‐Phase Modeling of an Industrial Fluidized Bed for Maximizing Iso‐Paraffins

Han

et al. 2022

Chemie Ingenieur Technik

Self Cite

View full text Add to dashboard Cite

The maximizing iso-paraffins (MIP) process is a new fluid catalytic cracking route to produce cleaner gasoline. Its major innovation is the diameter-transformed fluidized bed reactor which can be flexibly regulated to multiple distinct reaction zones. This study aims to accurately reveal complex behaviors in MIP reactor by two-phase modeling and three-phase modeling to extend its application. Both simulations of an industrial MIP reactor are compared in terms of solids and liquid concentration, temperature, coke content, gas velocity, and product yield. It is found the two-phase case is enough for predicting the region far away from the oil feedstock injection, and the other is the better choice especially in the first zone if the heat transfer model can be reasonably built.

show abstract

Section: Temperature Distributionsupporting

confidence: 58%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Two‐Phase and Three‐Phase Modeling of an Industrial Fluidized Bed for Maximizing Iso‐Paraffins

Han

et al. 2022

Chemie Ingenieur Technik

Self Cite

View full text Add to dashboard Cite

show abstract

“…Note that, for the sake of simplicity, in what follows we do not distinguish the difference between ε̅ g and ε g , as the model result was found only weakly dependent on their difference, as detailed in our previous work . Furthermore, the effects of the change of catalytic activity on the density and diameter of catalyst particles can be neglected, ,− because the coke is usually deposited on the surface of the internal pores of the catalysts and the coke content in the MIP reactor is extremely low (i.e., <2%). The diameter of the reactor acts as a numerical cutoff value in calculating d cl , such that d cl is no larger than it.…”

Section: Drag Data Preparationmentioning

confidence: 92%

Multiscale CFD Simulation of an Industrial Diameter-Transformed Fluidized Bed Reactor with Artificial Neural Network Analysis of EMMS Drag Markers

Han

Yang

et al. 2022

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Modeling of gas–solid, heterogeneously catalytic, diameter-transformed fluidized bed (DTFB) reactors is intrinsically complex and requires considering the variation of material properties and operating conditions, because of reactions and/or diameter transformation. The EMMS-matrix drag model, which correlates both operating conditions and local parameters, has been applied in computational fluid dynamics (CFD) simulation of such complex reactors by simplifying the macroscale operating conditions with one set of constant parameters. However, a complete scheme has not been reported that covers a wide range of datasets for a DTFB reactor with complex reactions. To this end, the artificial neural network (ANN), which enables exploring a multivariate relation with the contribution of a set of different parameters, is chosen to couple with EMMS drag modeling. A complete scheme of EMMS-ANN drag for hot, reactive simulation of DTFB is thereby established, with comprehensive evaluation of the contribution of drag markers successively considering the variation of gas properties and operating parameters. Both a priori tests and CFD simulations show that the voidage and slip velocity are the dominant factors in modeling of drag correction, and the effects of dynamic variation of gas properties and operating hydrodynamics are marginal; even the heterogeneous reactions and the change in bed diameter give rise to a remarkable variation in gas properties and operating parameters. The underlying mechanism is then analyzed to provide important clues for drag modeling of gas–solid, heterogeneous catalytic fluidized-bed reactors.

show abstract

Development and application of counter‐current feed injection technology in riser reactors

Yan

Fan

et al. 2022

Can J Chem Eng

Self Cite

View full text Add to dashboard Cite

A counter‐current feed injection scheme is proposed to improve the jet‐solid mixing and reaction in the injection zone of riser reactors. By analyzing the characteristics of the coupled flow field, combined with experiments and numerical simulation, the advantages of the new injection technology are investigated. Experimental results show that the particles distribute more uniformly when the feed is injected downward, which is good for the mixing and reaction of the jet with particles. By simulating the reaction in an industrial fluid catalytic cracking (FCC) riser, it is found that the yields of gasoline and liquefied petroleum gas (LPG) are increased significantly by using the counter‐current feed injection structure. Simultaneously, the formation of coke is reduced considerably. On this basis, a riser‐fluidized bed coupled reactor was designed by adopting the proposed counter‐current feed injection technology to solve the coking problem in an industrial pyridine synthesis system. Results from the side‐stream sampling show that the carbon content of the catalyst reduces significantly, indicating a decrease in coke formation. By now, the improved industrial reactor has been in stable operation for 2 years, showing good reliability.

show abstract

Gas-solid-liquid reactive CFD simulation of an industrial RFCC riser with investigation of feed injection

Cited by 17 publications

References 62 publications

Two‐Phase and Three‐Phase Modeling of an Industrial Fluidized Bed for Maximizing Iso‐Paraffins

Two‐Phase and Three‐Phase Modeling of an Industrial Fluidized Bed for Maximizing Iso‐Paraffins

Multiscale CFD Simulation of an Industrial Diameter-Transformed Fluidized Bed Reactor with Artificial Neural Network Analysis of EMMS Drag Markers

Development and application of counter‐current feed injection technology in riser reactors

Contact Info

Product

Resources

About