MIXING CHARACTERISTICS OF BINARY PARTICLES IN A FLUIDIZED BED

• Main Author: Adrianne P. A, Maylafaszya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67299
• Institution: Institut Teknologi Bandung

The minimum fluidization velocity is the velocity of the fluid when the upward forced exerted on the bed is equal to the weight of the bed. This parameter is important in fluidization because the minimum fluidization velocity indicates the starting point of the fluidization state. One of the objectives of this research is to characterize minimum fluidization velocity parameter and to review the accuracy of the existing correlations of minimum fluidization velocity. Among coal, pine chip, and sand, only coal and sand yield the predicted minimum fluidization velocity values with the relative error less than 10%. While the pine chip produces minimum fluidization with relative errors greater than 74% due to the generalization of the sphericity and voidage parameters, while the pine chip considered has a significant low sphericity. In this study, the minimum fluidization velocity of a mixture is calculates using two methods, namely using correlations which require the minimum fluidization velocity of each particle and using correlations which only require the physical properties of each particle. Based on the calculations, the first method of mixture minimum fluidization velocity calculation produces the difference with the lowest experimental results as it considers the minimum fluidization velocity and mass fraction of each particle. In addition, particle mixing is also an important fluidization parameter because it is a factor affecting heat transfer in fluidized bed combustion which is essential for the combustion of coal or biomass in a fluidized bed. The predicted mixing index produced from the existing correlation results a curve trend similar to the mixing index from the experiment. The mass fraction has no effect on the mixing index of the coal and sand mixture, but it has an effect on the mixing index of the cotton stalk and sand mixture.