The final model successfully concluded that propylene yield in the studied plant was contributed by the factors of 0.00496, 0.00204, and-3.96 of hearth burner flow, dilution s team flow, and naphtha feed flow respectively. The analysis was conducted to forecast the maximum propylene yield in the studied plant with careful consideration to select only significant variables, represented by a variance inflation factor (VIF) <10 and p-value <0.05 in the analysis of variance (ANOVA) table. Surface response analysis is a robust mathematical and statistical approach that is having a good potential to be systematically utilized in the actual large-scale olefin plant as an alternative to the expensive olefin simulation software for process monitoring. Surface response analysis was conducted in the Minitab software version 20 using the historical data after the clearance of both the outliers and residuals to ensure the analysis was conducted as normal data. The study was conducted in the actual world-scale olefin plant with a focus on measuring the impact of identified controlled variables at the steam cracker furnace towards the propylene yield. The model has a good agreement between the values of prediction and experimental of in most cases. It was found that modeling approach is more capable to define the parameters of coke formation equations. The results of this model have been compared with actual data and deviation has been reported. With new efficient coil diameter calculating all mentioned approach will be repeated for next time segment. It means that in a length segment of coil (Δz), momentum, energy as well as mass equations are solved, then the amount of precipitated coke in each length segment is achieved. Due to study and compare coke formation, a specific time period has been selected in equal segments and equations have been solved. In this study, ethylene furnace modeling is carried out by ethane pyrolysis (thermal cracking or hydrocracking) method in Arya Sasol Petrochemical Company (ninth olefin unit, Assaluyeh, Iran), which includes the solution of kinetic equations and transfer phenomena, by the forward finite difference method in the MATLAB.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |