§03§Preface§ §MODELING OF GASIFIERS: OVERVIEW OF CURRENT DEVELOPMENTS§Numerical Modeling in Engineering§CFD-Based Modeling of Entrained Flow Gasifiers§Benchmark Tests for CFD Modeling§ §GASIFICATION OF SOLIDS: PAST, PRESENT AND FUTURE§Introduction§Historical Background§Types of Gasification Reactors§Trends in Gasifier Development§Derived Challenges for Research§ §MODELING OF MOVING PARTICLES: REVIEW OF BASIC CONCEPTS AND MODELS§Introduction§Soft-Sphere Model§Hard-Sphere Model§ §CD AND Nu CLOSURE RELATIONS FOR SPHERICAL AND NON-SPHERICAL PARTICLES§Literature Review§Model Description§Code and Software Validation§Porous Particles§Non-Spherical Particles§ §SINGLE PARTICLE HEATING 〓Nonporous Spherical Particle Heating in a Stream of Hot Air§Heating of a Porous Particle§Spherical Particle Drying in a Stream of Hot Air§Conclusions§ §UNSTEADY CHAR GASIFICATION/COMBUSTION§Introduction§ §03§Modeling Approach§Numerics 〓Advices for Beginners§Analytical Methods§ §INTERFACE TRACKING DURING CHAR PARTICLE GASIFICATION§Interface and Porosity Tracking for a Moving Char Particle§3D Interface Tracking for a Porous Char Particle in a Kinetic Regime§Conclusions§ §PSEUDO-STEADY-STATE APPROACH FOR CARBON PARTICLE COMBUSTION/GASIFICATION§Particle-Resolved CFD Simulations: Spherical Particles§Particle-Resolved CFD Simulations: Nonspherical Particles§Conclusions§Setup of Heterogeneous Reactions in ANSYS FLUENT§ §PORE-RESOLVED SIMULATION OF CHAR PARTICLE COMBUSTION/GASIFICATION§Introduction§Model Assumptions and Chemistry§Small Porous Particle: 90 µm§Large Porous Particle: 2mm§3D Simulations under Gasification Conditions§Conclusions§ §SUBGRID MODELS FOR PARTICLE DEVOLATILIZATION-COMBUSTION-GASIFICATION§Subgrid Model for the Devolatilization/Combustion of a Moving Coal Particle§Novel Intrinsi §03§c Submodel for Gasification of a Moving Char Particle§ §NEW FRONTIERS AND CHALLENGES IN GASIFICATION TECHNOLOGIES§Introduction§Trends in Gasifier Design§Future Gasifier Simulations§ §Index§ §16§Bridging the gap between the well-known technological description of gasification and the underlying theoretical understanding, this book covers the latest numerical and semi-empirical models describing interphase phenomena in high-temperature conversion processes. §Consequently, it focuses on the description of gas-particle reaction systems by state-of-the-art computational models in an integrated, unified form. Special attention is paid to understanding and modeling the interaction between individual coal particles and a surrounding hot gas, including heterogeneous and homogeneous chemical reactions inside the particle on the particle interface and near the interface between the solid and gas phases.§While serving the needs of engineers involved in industrial research, development and design in the field of gasification technologies, this book's in-depth coverage makes it equally ideal for young and established researchers in the fields of thermal sciences and chemical eng §16§ineering with a focus on heterogeneous and homogeneous reactions.§
