Gasification Processes: Modeling and Simulation

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 engineering with a focus on heterogeneous and homogeneous reactions.

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 & DRYING Non–Porous 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 Modeling Approach Numerics & Code Validation 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: Non–Spherical 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 ?m 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 Intrinsic Submodel for Gasification of a Moving Char Particle NEW FRONTIERS AND CHALLENGES IN GASIFICATION TECHNOLOGIES Introduction Tendencies in Gasifier Design Future Gasifier Simulations

Petr Nikrityuk is an associate professor at the Department of Chemical and Materials Engineering, University of Alberta (UofA), Canada. Before taking his current position at UofA, Petr Nikrityuk was the head of the research group Interphase Phenomena within the Center for Innovation Competence VIRTUHCON at the Techische Universität Bergakademie Freiberg (TUBAF), Germany. He studied mechanical engineering at the Moscow Aviation Institute – MAI, where he obtained his PhD on the topic of mathematicalmodeling of thermal processes. Before taking his research group leader position in Freiberg, Petr Nikrityuk worked as software developer in the field of computational fluid dynamics and as a post doc fellow in the Institute for Aerospace Engineering at the Dresden University of Technology. Bernd Meyer is the Director of the Department of the Energy Process Engineering and Chemical Engineering at the Techische Universität Bergakademie Freiberg (TUBAF), Germany. Having obtained his academic degrees from TUBAF, he spent most of his career working in research and development in gasification and power plant technologies before taking up the appointment as a professor at TUBAF, Chair of Energy Process Engineering and Thermal Waste Treatment (EVT). Since 2008 he is member of the Saxonian Academy of Sciences and Rector of the TUBAF. Prof. Meyer is author and coauthor of more than 90 patents in the field of gasification and related technologies.