Numerical Investigation to Study the Segregation Characteristics in Fluidized Bed Gasifiers

Abstract

In this work, the flow properties of gas-solid fluidized beds are investigated, with particular attention to Geldart-B particles that differ in size but have comparable densities, as well as particles that have the same size but variable densities. The investigation explores the impact of various factors on bed behavior, including bed dimensions, gas velocity profiles, initial bed height, solid fraction variations, and particle properties such as density, restitution coefficient, and specularity coefficient. It also assesses the impact of mesh size on computational accuracy and evaluates different drag models for their effectiveness in simulating fluidized bed dynamics. The simulation framework is validated against real data from experiments, ensuring that simulated results closely match real-world observations and enhancing the model's reliability. Combining experimental data with simulations confirms the theoretical framework and improves models' predictive capabilities. The integrated approach provides insights into optimizing fluidized bed operations for various industrial applications. Understanding the interaction of factors like particle size, density, and bed geometry allows for adjustments in operational parameters, enhancing efficiency and performance. Accurate predictions aid in designing and scaling up fluidized bed systems with greater confidence. This research advances the understanding and predictive accuracy of gas-solid fluidized bed systems, providing a strong foundation for further exploration and optimization of these technologies, supporting innovation and improvement in related industrial processes.