The Iron Blast Furnace

The Iron Blast Furnace

Theory and Practice

1st Edition - January 1, 1979

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  • Authors: J. G. Peacey, W. G. Davenport
  • eBook ISBN: 9781483146782

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Description

The Iron Blast Furnace: Theory and Practice presents the significant role of iron blast furnace by which iron is efficiently and rapidly reduced from ore and it is the basis for all primary steelmaking. This book discusses the importance of blast-furnace process as a complete operation. Organized into 14 chapters, this book begins with an overview of the existing experimental, theoretical, and operational evidence about the blast furnace. This text then examines the blast furnace from the outside, including its size, production rate, products, raw materials, operation, and costs. Other chapters consider the primary objective of the blast furnace to produce molten iron of constant composition. This book discusses as well the operation of the furnace from the point of view of what happens to the raw materials after they enter the furnace. The final chapter deals with the linear programming methods by using the known physical constraints on industrial furnaces. This book is a valuable resource for engineers.

Table of Contents


  • Preface

    Acknowledgements

    1. A Brief Description of the Blast-Furnace Process

    1.1 Raw Materials

    1.2 Products

    1.3 Operation

    1.4 Improvements in Productivity

    1.5 Blast-Furnace Costs

    1.6 Summary

    Problems

    2. A Look Inside the Furnace

    2.1 Behaviour in Front of the Tuyères

    2.2 Reactions in the Hearth, Tuyère Raceways and Bosh

    2.3 The Fusion Zone

    2.4 Reduction Above the Fusion Zone

    2.5 Kinetics of the Coke Gasification Reaction

    2.6 Reactions in Regions above the 1200 K Isotherm

    2.7 Reduction of Higher Oxides

    2.8 The Top Quarter of the Shaft and the Exit Gas

    2.9 Residence Times

    2.10 Burden Arrangements

    2.11 Summary

    Problems

    3. Thermodynamics of the Blast-Furnace Process: Enthalpies and Equilibria

    3.1 Enthalpy Requirements in the Blast Furnace

    3.2 Critical Hearth Temperature

    3.3 Temperature Profiles in the Furnace: The Thermal Reserve Zone

    3.4 Free Energy Considerations in the Blast Furnace: The Approach to Equilibrium

    3.5 Gas Composition Profiles in the Furnace: The Chemical Reserve Zone

    3.6 Summary

    Problems

    4. Blast-Furnace Stoichiometry

    4.1 The Stoichiometric Development

    4.2 The Stoichiometric Equation

    4.3 Calculations

    4.4 Graphical Representation of the Stoichiometric Balance

    4.5 Summary

    Problems

    5. Development of a Model Framework: Simplified Blast-Furnace Enthalpy Balance

    5.1 Simplifications for an Initial Enthalpy Balance

    5.2 The Enthalpy Balance

    5.3 Heat Supply and Heat Demand

    5.4 A General Enthalpy Framework

    5.5 Summary

    Problems

    6. The Model Framework: Combination of Stoichiometric and Enthalpy Equations

    6.1 Combining Stoichiometric and Enthalpy Equations: Calculations

    6.2 Graphical Representation of the Combined Stoichiometric-Enthalpy Equation

    6.3 A Graphical Calculation

    6.4 Summary and Discussion of Stoichiometry/Enthalpy Graph

    Problems

    7. Completion of the Stoichiometric Part of the Model: Conceptual Division of the Blast Furnace through the Chemical Reserve Zone

    7.1 The Blast Furnace as Two Separate Reactors

    7.2 Stoichiometric Balances for the Bottom Segment

    7.3 Stoichiometric Equation for the Wustite Reduction Zone

    7.4 Discussion and Summary

    Problems

    8. Enthalpy Balance for the Bottom Segment of the Furnace

    8.1 Enthalpy Balance for the Bottom Segment

    8.2 The Demand-Supply Form of the Enthalpy Equation

    8.3 Numerical Development

    8.4 Summary

    Problems

    9. Combining Bottom Segment Stoichiometry and Enthalpy Equations: A Priori Calculation of Operating Parameters

    9.1 Example Calculations

    9.2 Implications of the Equations

    9.3 Graphical Representation of the Equations

    9.4 A Graphical Calculation

    9.5 Characteristics of the Operating Line

    9.6 Summary

    Problems

    10. Testing of the Mathematical Model and a Discussion of its Premises

    10.1 Testing for Thermal Validity

    10.2 Top-Gas Temperature Calculation

    10.3 Testing for Stoichiometric Validity

    10.4 Testing for Thermodynamic Validity

    10.5 Validity of the Model Assumptions and Predictions

    10.6 Non-Attainment of Equilibrium in the Chemical Reserve Zone

    10.7 Thermal Reserve Temperature Effects

    10.8 Summary

    Problems

    11. The Effects of Tuyère Injectants on Blast-Furnace Operations

    11.1 A General Injectant

    11.2 Representing Injected Materials in the Overall Stoichiometric Equation

    11.3 Representing Injected Materials in the Bottom Segment Stoichiometric Equation

    11.4 Representing Injected Materials in the Bottom Segment Enthalpy Equation

    11.5 A Form Convenient for Calculations

    11.6 Example Calculations: I. Oxygen Enrichment

    11.7 Example Calculations: II. Hydrocarbon Injection

    11.8 Graphical Calculations (General Case)

    11.9 Top-Gas Composition with Hydrogen Injection

    11.10 Discussion of Injection Calculations and Summary

    Problems

    12. Addition of Details into the Operating Equations: Heat Losses; Reduction of Si and Mn; Dissolution of Carbon; Formation of Slag; Decomposition of Carbonates

    12.1 Stoichiometric Effects

    12.2 Enthalpy Effects

    12.3 Summary

    Problems

    13. Summary of Blast-Furnace-Operating Equations: Comparison between Predictions and Practice

    13.1 Summary of Model Development Steps

    13.2 A Strategy for Computer Calculation

    13.3 Comparison of Model Predictions with Industrial Blast-Furnace Data

    13.4 Effects of Blast Temperature, Tuyère Injectants, Metallized Ore and Metal Impurities on Coke and Blast Requirements

    13.5 Summary

    14. Blast-Furnace Optimization by Linear Programming

    14.1 A Simplified Optimization Problem

    14.2 Graphical Representation of Cost Minimization

    14.3 Analytical Optimization Methods

    14.4 Computer Inputs and Outputs

    14.5 A More Complete Problem

    14.6 Summary

    Problems

    Appendix I Tuyère Flame Temperature Calculations

    AI.1 Flame Temperature Equations for Linear Programming

    AI.2 Additional Items in the Calculations

    Appendix II Representing Complex Tuyère Injectants in the Operating Equations

    AII.1 Gaseous Injectants with Known Heats of Combustion and Chemical Compositions

    AII.2 Injectants with Known Weight Percentages of Carbon and Hydrogen and Known Heats of Combustion

    Appendix III Slag Heat Demands

    Appendix IV Stoichiometric Data for Minerals and Compounds in Ironmaking

    Appendix V Enthalpies of Formation at Temperature T from Elements at Temperature T (HfT)

    Appendix VI Enthalpy Increment Equations for Elements and Compounds, [ΗºT — Hº298]

    Appendix VII Numerical Values of EB, Blast Enthalpy

    Answers to Numerical Problems

    List of Symbols

    Index

Product details

  • No. of pages: 266
  • Language: English
  • Copyright: © Pergamon 1979
  • Published: January 1, 1979
  • Imprint: Pergamon
  • eBook ISBN: 9781483146782

About the Authors

J. G. Peacey

W. G. Davenport

Professor William George Davenport is a graduate of the University of British Columbia and the Royal School of Mines, London. Prior to his academic career he worked with the Linde Division of Union Carbide in Tonawanda, New York. He spent a combined 43 years of teaching at McGill University and the University of Arizona.

His Union Carbide days are recounted in the book Iron Blast Furnace, Analysis, Control and Optimization (English, Chinese, Japanese, Russian and Spanish editions).

During the early years of his academic career he spent his summers working in many of Noranda Mines Company’s metallurgical plants, which led quickly to the book Extractive Metallurgy of Copper. This book has gone into five English language editions (with several printings) and Chinese, Farsi and Spanish language editions.

He also had the good fortune to work in Phelps Dodge’s Playas flash smelter soon after coming to the University of Arizona. This experience contributed to the book Flash Smelting, with two English language editions and a Russian language edition and eventually to the book Sulfuric Acid Manufacture (2006), 2nd edition 2013.

In 2013 co-authored Extractive Metallurgy of Nickel, Cobalt and Platinum Group Metals, which took him to all the continents except Antarctica.

He and four co-authors are just finishing up the book Rare Earths: Science, Technology, Production and Use, which has taken him around the United States, Canada and France, visiting rare earth mines, smelters, manufacturing plants, laboratories and recycling facilities.

Professor Davenport’s teaching has centered on ferrous and non-ferrous extractive metallurgy. He has visited (and continues to visit) about 10 metallurgical plants per year around the world to determine the relationships between theory and industrial practice. He has also taught plant design and economics throughout his career and has found this aspect of his work particularly rewarding. The delight of his life at the university has, however, always been academic advising of students on a one-on-one basis.

Professor Davenport is a Fellow (and life member) of the Canadian Institute of Mining, Metallurgy and Petroleum and a twenty-five year member of the (U.S.) Society of Mining, Metallurgy and Exploration. He is recipient of the CIM Alcan Award, the TMS Extractive Metallurgy Lecture Award, the AusIMM Sir George Fisher Award, the AIME Mineral Industry Education Award, the American Mining Hall of Fame Medal of Merit and the SME Milton E. Wadsworth award. In September 2014 he will be honored by the Conference of Metallurgists’ Bill Davenport Honorary Symposium in Vancouver, British Columbia (his home town).

Affiliations and Expertise

University of Arizona, AZ, USA

About the Editor

D. W. Hopkins

Affiliations and Expertise

University College of Swansea, UK

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