Session: DA-10-01/11-01 Design of Bolted Joints (joint with CT) and CFD in Design and Analysis

Paper Number: 61671

Start Time: Wednesday, July 14, 2021, 08:00 PM

61671 - Reactive CFD Simulation of Fixed Coke Formation in an Industrial RFCC Riser Reactor 

Severe fixed Coke in the industrial resid fluid catalytic cracking (RFCC) riser reactor often results in the reduction of product yield and unplanned unit shutdown. It is difficult to investigate fixed coking formation near wall especially in the feed injection zone of riser due to no model to depict the processes of physical and chemical. In this paper, the complex gas-solid-liquid three phase flow, mixing and cracking reaction are 3D simulated with energy-minimization multi-scale (EMMS) drag and mass transfer models in agreement with the industrial data. A new coking correlation model is developed to predict the possibility of fixed coke formation based on the 3D accurate simulation. The effects of different diameter of feed oil droplet on the vaporizing process and reaction yield are discussed by simulation. The results indicate that the fixed coke formation can be well depicted by the coking index. The predicted of fixed coke in the feedstock injection zone are same with the actual positions in industrial unit, which mainly located near the walls of the 0.5~3.0m height above the feed nozzles and the circumferential between adjacent nozzles. A suitable oil droplet diameter can improve the mixing of catalyst and oil and the yield of target products, such as gasoline and LPG.

Presenting Author: Sheng Chen Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation，China Special Equipment Inspection and Research Institute （CSEI）

Authors:

Sheng Chen Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation，China Special Equipment Inspection and Research Institute （CSEI）
Haoyuan Kang Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation，China Special Equipment Inspection and Research Institute （CSEI）
Mengke Wang China University of Petroleum-Beijing
Cenfan Liu Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation，China Special Equipment Inspection and Research Institute （CSEI）
Haitao Lin China Huanqiu Contracting & Engineering Co., Ltd.
Juanbo Liu Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation，China Special Equipment Inspection and Research Institute （CSEI）