Analysis of Heating and Vaporization of Feed Droplets in Fluidized Catalytic Cracking Risers

Buchanan, J. Scott

doi:10.1021/ie00036a027

Cited by 67 publications

(95 citation statements)

References 4 publications

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“…Some of these studies are discussed in the following paragraphs. Buchanan (1994) analyzed the model of heating and vaporization of feed droplet based on following hypothesis; direct contact, convective heat transfer and radiative heat transfer. The model based on direct contact hypothesis can be used to estimate enhanced heat transfer coefficient by assuming infinitely fast heat transfer during droplet/particle collisions.…”

Section: Brief Review Of Previous Workmentioning

confidence: 99%

“…This type of collision is referred to as impact with transfer. Mirgain et al (2000) applied the approach of Buchanan (1994). The vaporization time was then estimated from the time needed for the liquid to impact enough particles.…”

Section: Brief Review Of Previous Workmentioning

confidence: 99%

“…This emphasized the fact that droplet diameter is an important parameter for vaporization. Buchanan (1994) also considered convective heat transfer through a gas layer between the drop and the particles ('Leidenfrost effect'). This approach was similar to the homogeneous case but was corrected to take into account the fact that the thermal boundary layer through which heat transfer occurs is affected by the presence of the particles.…”

Section: Brief Review Of Previous Workmentioning

confidence: 99%

“…The model combines a predictive riser hydrodynamic model with a four lump kinetic model. However, the model uses empirical correlation (of Buchanan, 1994) for estimating the heat transfer coefficient for droplet vaporization which does not include influence of key parameters like solid heat capacity, particle diameter and so on. The model also considered a single value for the heat of reaction and a specific boiling point for the gas oil and is therefore of limited applicability.…”

Section: Brief Review Of Previous Workmentioning

confidence: 99%

See 3 more Smart Citations

Modeling of vaporization and cracking of liquid oil injected in a gas–solid riser

Nayak

Joshi

Ranade

2005

Chemical Engineering Science

107

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Section: Brief Review Of Previous Workmentioning

confidence: 99%

Section: Brief Review Of Previous Workmentioning

confidence: 99%

Section: Brief Review Of Previous Workmentioning

confidence: 99%

Section: Brief Review Of Previous Workmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of vaporization and cracking of liquid oil injected in a gas–solid riser

Nayak

Joshi

Ranade

2005

Chemical Engineering Science

107

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“…the time needed for complete vaporization varies from 0.3 to 30 ms in typical FCC units [28] which is far less than the feed oil residence time within typical industrial risers (3-4 s). Another reason is to be consistent with the fact that reaction parameters for the 11-lump kinetic model used herein and most other published lump kinetic models are derived with the hypothesis of gaseous feed injection.…”

Section: Process and Hardware Descriptionmentioning

confidence: 99%

CFD investigation of hydrodynamics, heat transfer and cracking reactions in a large-scale fluidized catalytic cracking riser

Yang

Berrouk²,

et al. 2016

Applied Mathematical Modelling

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investigation of hydrodynamics, heat transfer and cracking reactions in a large-scale fluidized catalytic cracking riser, Applied Mathematical Modelling (2016), 1 Highlights  Hydrodynamics coupled with cracking reactions in an FCC riser were studied. Two-fluid mathematical approach was used to model the fluid-particle flow. Intricate phenomena near a series of injecting nozzles were revealed in detail. A recommendation of an appropriate increasing of the feed injection angle was proposed. Yields and reaction rates of main products and catalyst activity were investigated. ABSTRACTA three-dimensional reactive gas-particle CFD model was built to study the hydrodynamics, heat transfer and cracking reaction behaviors within an industrial Fluid Catalytic Cracking (FCC) riser reactor designed to maximize propylene production. The two-fluid methodology (TFM) was used to simulate the riser hydrodynamics with solid phase properties derived from the kinetic theory of granular flows (KTGF). An 11-lump kinetic model was selected to represent the cracking reaction network in the CFD model. The selection of the kinetic model is dictated by the properties of the feedstock processed and the aim of the process which is maximizing propylene. A novel treatment of the coke component was conducted by incorporating coke into the secondary granular phase which is more realistic since carbon deposition occurs on catalyst phase. Momentum transfer, heat transfer and reaction behavior inside the riser were discussed in detail and inhomogeneity in these aspects were observed especially above the high speed injection nozzles. The numerical results of this investigation show a good agreement with the process real data on the yield distribution despite the use of a coarse grid to mesh such an industrial scale FCC riser. The methodology employed used and the results obtained should serve as guidelines for possible process redesign and optimization.

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Flows with Phase Change

Ranade

Utikar

2022

Multiphase Flows for Process Industries

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Analysis of Heating and Vaporization of Feed Droplets in Fluidized Catalytic Cracking Risers

Cited by 67 publications

References 4 publications

Modeling of vaporization and cracking of liquid oil injected in a gas–solid riser

Modeling of vaporization and cracking of liquid oil injected in a gas–solid riser

CFD investigation of hydrodynamics, heat transfer and cracking reactions in a large-scale fluidized catalytic cracking riser

Flows with Phase Change

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