Gasification processes : modeling and simulation / / edited by Petr A. Nikrityuk and Bernd Meyer

• Pubblicazione: Weinheim, Germany : , : Wiley-VCH, , 2014; ©2014
• Descrizione fisica: 1 online resource (362 p.)
• Disciplina: 665.772
• Soggetto topico: Coal gasification - Social aspects; Coal gasification - Environmental aspects; Gas industry - Social aspects
• Persona (resp. second.): NikrityukPetr A.; MeyerBernd
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references at the end of each chapters and index.
• Nota di contenuto: Gasification Processes; Contents; Preface; List of Contributors; Acknowledgments; Recommended Reading; Coal Gasification: Basic Terminology; Chapter 1 Modeling of Gasifiers: Overview of Current Developments; 1.1 Numerical Modeling in Engineering; 1.1.1 The Role of Direct Numerical Simulation (DNS) in Particulate-Flow Modeling; Summary; 1.2 CFD-based Modeling of Entrained-Flow Gasifiers; 1.2.1 Mainstream Computational Submodels; 1.2.1.1 Particle Conversion; 1.2.1.2 Turbulence-Chemistry Interaction; 1.2.2 Review of CFD-related Works; 1.2.2.1 Noncommercial Software; 1.2.2.2 Commercial Software ; Summary1.3 Benchmark Tests for CFD Modeling; 1.3.1 British Coal Utilization Research Association Reactor (BCURA); 1.3.2 Brigham Young University Reactor (BYU); 1.3.3 Pressurized Entrained-Flow Reactor (PEFR); References; Chapter 2 Gasification of Solids: Past, Present, and Future; 2.1 Introduction; 2.2 Historical Background; 2.3 Types of Gasification Reactors; 2.4 Trends in Gasifier Development; 2.5 Derived Challenges for Research; References; Chapter 3 Modeling of Moving Particles: Review of Basic Concepts and Models; 3.1 Introduction; 3.2 Soft-Sphere Model; 3.2.1 Numerical Implementation ; 3.2.1.1 Contact Forces3.2.1.2 Collision Parameters; 3.2.1.3 Contact Detection; 3.2.1.4 Time Integration; 3.2.2 Validation Cases; 3.2.2.1 Free-Falling Particle; 3.2.2.2 Analytic Solution for the Free-falling Particle; 3.2.2.3 Slipping Sphere on a Rough Surface; 3.2.3 Illustrative Examples; 3.2.3.1 Breaking Dam Problem; 3.2.3.2 Rotating Drum; 3.2.3.3 Generation of Fixed Beds; 3.3 Hard-Sphere Model; 3.3.1 Governing Equations; 3.3.2 Collision Treatment in Dense Particulate Systems; 3.3.3 2D Formulation of Hard-Sphere Collisions; 3.3.4 Illustration of Hard-Sphere Models; 3.3.5 Conclusions ; NomenclatureReferences; Chapter 4 CD and Nu Closure Relations for Spherical and NonSpherical Particles; 4.1 Literature Review; 4.2 Model Description; 4.2.1 Numerical Scheme and Discretization; 4.3 Code and Software Validation; 4.4 Porous Particles; 4.4.1 Geometry Assumptions; 4.4.2 Heat and Fluid Flow Past Porous Particles; 4.4.3 Drag and Nusselt Numbers for Porous Particles; 4.5 Nonspherical Particles; 4.5.1 Heat and Fluid Flow of Particles Oriented in the Flow Direction; 4.5.2 Flow Characteristics of Particles at Different Angles of Attack ; 4.5.3 Influence of Particle Orientation on Drag Forces and Heat Transfer4.5.3.1 Drag Forces; 4.5.3.2 Heat Transfer; 4.5.3.3 Drag Forces and Nusselt Relations for Two Rotations; 4.5.4 Discussion; 4.5.5 Conclusion; References; Chapter 5 Single Particle Heating and Drying; 5.1 Nonporous Spherical Particle Heating in a Stream of Hot Air; 5.1.1 State of the Art; 5.1.2 Problem and Model Formulation; 5.1.2.1 Linear Model; 5.1.3 Illustration of Results and Subgrid Model; 5.1.4 Semiempirical Two-Temperature Subgrid Model; 5.2 Heating of a Porous Particle; 5.2.1 Problem and Model Formulation ; 5.2.2 Porosity
• Sommario/riassunto: 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 re
• Titolo autorizzato: Gasification processes
• ISBN: 3-527-67320-2; 3-527-67318-0; 3-527-67321-0
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Lingua di pubblicazione: Inglese
• Record Nr.: 9910815238303321
• Lo trovi qui: Univ. Federico II