Effect of flow patterns in the recirculation catalyst standpipe on the performance of FCC high-efficiency regenerator

Peng, Wei; Wei, Yaodong; Liu, Yansheng; Han, Shengxian; Bao, Binyang

doi:10.1016/j.ces.2021.117154

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…According to the pressure balance relationship, as eq shows, we can evaluate the pressure drops of both valves. For example, when the pressure drop of valve 1 is set as 20 kPa, the pressure drop of valve 2 is 9.73 kPa p regenerator + p combustor + p valve 0.25em 1 = p disengager + p riser + p valve 0.25em 2 …”

Section: Simulation Methods and Settingmentioning

confidence: 99%

Hydrodynamic Full-Loop Simulation of an Industrial Fluid Catalytic Cracking Fluidized Bed System with Mechanical Valves

Wu,

Liu,

et al. 2024

Ind. Eng. Chem. Res.

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Circulating fluidized bed (CFB) systems are the core unit of many chemical and energy processes. Realizing a full-loop CFB system simulation can help one understand system operation laws for achieving optimal production. This study realizes a full-loop simulation of a 1.20 Mt/a industrial reaction− regeneration CFB system by applying mesoscale drag and constructing a mechanical valve pressure regulation model. The effects of the energyminimization multiscale (EMMS)-based drag models are investigated by analyzing the solid concentration, full-loop pressure balance, and mass flow rate. Then, the flow characteristics of the single-riser and full-loop simulations are compared. It is found that the single-riser simulation predicts a wider frequency distribution of solid concentration (average value ≈1.6 Hz), while the full-loop simulation captures a dominating frequency at a much lower value (≈0.1 Hz), indicating that the above two kinds of simulations reveal significantly different mechanisms in particle conveying and dynamic behavior of mesoscale structures.

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Section: Simulation Methods and Settingmentioning

confidence: 99%

Hydrodynamic Full-Loop Simulation of an Industrial Fluid Catalytic Cracking Fluidized Bed System with Mechanical Valves

Wu,

Liu,

et al. 2024

Ind. Eng. Chem. Res.

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Effect of regenerated standpipe flow pattern on catalyst transport in fluid catalytic cracking unit

Peng,

Huang,

Zhang

et al. 2024

Energy

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Erosion Prediction in FCC Unit of Refinery Through Computational Fluid Dynamics Simulation

Abdul

Rakshit

Voolapalli

et al. 2022

Day 4 Thu, November 03, 2022

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In the Fluid Catalytic Cracking unit of refinery, erosion due to catalyst impact on wall refractories is a serious issue that affects the plant performance. In the present study, Computational Fluid Dynamics (CFD) coupled with Discrete Element Model (DEM) method is used to characterize gas-solid flow dynamics and erosion in regenerated catalyst slide pipe (RCSP). Catalyst particles size in the range of 1-180 µm were considered for the simulations. The predicted erosion profile was verified by comparing with thermography experiments and were found in a good agreement. The predicted results revealed that due to partial opening and orientation of regenerated catalyst slide valve, the rapid alterations of flow direction of catalyst particles take place. Particles recirculate in the rear end of the pipe and continuously impinges at the 12 o'clock position upstream of the valve. This led to erosion in the pipe. The experimentally validated CFD model was used to characterize the erosion profile under different relative openings of regenerated catalyst slide valve (RSCV). It was observed that with increasing the valve opening the erosion profile was reduced due to decreases catalyst recirculation velocity and vice-versa. Further, effect of valve opening orientation was also studied and it was found that by changing the valve opening orientation from parallel to ground surface to down towards, erosion was not observed due to small recirculatory flow of catalyst with low velocity. The results presented in this work will help refiners to understand the catalyst flow dynamics inside the regenerated catalyst slide pipe, root cause of erosion in pipes, and to achieve further improvements in the performance of plant.

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Effect of flow patterns in the recirculation catalyst standpipe on the performance of FCC high-efficiency regenerator

Cited by 4 publications

References 27 publications

Hydrodynamic Full-Loop Simulation of an Industrial Fluid Catalytic Cracking Fluidized Bed System with Mechanical Valves

Hydrodynamic Full-Loop Simulation of an Industrial Fluid Catalytic Cracking Fluidized Bed System with Mechanical Valves

Effect of regenerated standpipe flow pattern on catalyst transport in fluid catalytic cracking unit

Erosion Prediction in FCC Unit of Refinery Through Computational Fluid Dynamics Simulation

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