November 26, 2020

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Rotary Kilns

Rotary Kilns
Author : Akwasi A Boateng
Publisher : Butterworth-Heinemann
Release Date : 2011-03-31
Category : Technology & Engineering
Total pages :368
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Rotary Kilns—rotating industrial drying ovens—are used for a wide variety of applications including processing raw minerals and feedstocks as well as heat-treating hazardous wastes. They are particularly critical in the manufacture of Portland cement. Their design and operation is critical to their efficient usage, which if done incorrectly can result in improperly treated materials and excessive, high fuel costs. This professional reference book will be the first comprehensive book in many years that treats all engineering aspects of rotary kilns, including a thorough grounding in the thermal and fluid principles involved in their operation, as well as how to properly design an engineering process that uses rotary kilns. Chapter 1: The Rotary Kiln Evolution & Phenomenon Chapter 2: Basic Description of Rotary Kiln Operation Chapter 3: Freeboard Aerodynamic Phenomena Chapter 4: Granular Flows in Rotary Kilns Chapter 5: Mixing & Segregation Chapter 6: Combustion and Flame Chapter 7: Freeboard Heat Transfer Chapter 8: Heat Transfer Processes in the Rotary Kiln Bed Chapter 9: Mass & Energy Balance Chapter 10: Rotary Kiln Minerals Process Applications ·Covers fluid flow, granular flow, mixing and segregation, and aerodynamics during turbulent mixing and recirculation ·Offers hard-to-find guidance on fuels used for rotary kilns, including fuel options such as natural gas versus coal-fired rotary kilns ·Explains principles of combustion and flame control, heat transfer and heating and material balances

Rotary Kilns

Rotary Kilns
Author : Akwasi A Boateng
Publisher : Butterworth-Heinemann
Release Date : 2015-11-13
Category : Technology & Engineering
Total pages :390
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Rotary Kilns—rotating industrial drying ovens—are used for a wide variety of applications including processing raw minerals and feedstocks as well as heat-treating hazardous wastes. They are particularly critical in the manufacture of Portland cement. Their design and operation is critical to their efficient usage, which if done incorrectly can result in improperly treated materials and excessive, high fuel costs. This professional reference book will be the first comprehensive book in many years that treats all engineering aspects of rotary kilns, including a thorough grounding in the thermal and fluid principles involved in their operation, as well as how to properly design an engineering process that uses rotary kilns. This new edition contains an updated CFD section with inclusion of recent case studies and in line with recent developments covers pyrolysis processes, torrefaction of biomass, application of rotary kilns in C02 capture and information on using rotary kilns as incinerators for hydrocarbons. Provides essential information on fluid flow, granular flow, mixing and segregation, and aerodynamics during turbulent mixing and recirculation Gives guidance on which fuels to choose, including options such as natural gas versus coal-fired rotary kilns Covers principles of combustion and flame control, heat transfer and heating and material balances New edition contains information on pyrolysis processes with low temperatures and torrefaction of biomass. It also covers calcination of petcoke, how rotary kilns are used as incinerators for chlorinated hydrocarbons. Includes updated material on CFD simulation of kiln gas and solids flow with a selection of recent case studies.

Limestone Sorbent Regeneration in Externally Fired Rotary Kilns

Limestone Sorbent Regeneration in Externally Fired Rotary Kilns
Author : Argonne National Laboratory,D.S. Moulton,F.F. Nunes
Publisher : Unknown
Release Date : 1979
Category : Limestone
Total pages :34
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Heat Transfer in Rotary Kilns with Due Regard to Cyclic Processes and Phase Formation

Heat Transfer in Rotary Kilns with Due Regard to Cyclic Processes and Phase Formation
Author : Paul Weber
Publisher : Unknown
Release Date : 1963
Category : Cement kilns
Total pages :98
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Rotary Kilns

Rotary Kilns
Author : Akwasi A Boateng
Publisher : Butterworth-Heinemann
Release Date : 2008-03-10
Category : Technology & Engineering
Total pages :368
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Rotary Kilns—rotating industrial drying ovens—are used for a wide variety of applications including processing raw minerals and feedstocks as well as heat-treating hazardous wastes. They are particularly critical in the manufacture of Portland cement. Their design and operation is critical to their efficient usage, which if done incorrectly can result in improperly treated materials and excessive, high fuel costs. This professional reference book will be the first comprehensive book in many years that treats all engineering aspects of rotary kilns, including a thorough grounding in the thermal and fluid principles involved in their operation, as well as how to properly design an engineering process that uses rotary kilns. Chapter 1: The Rotary Kiln Evolution & Phenomenon Chapter 2: Basic Description of Rotary Kiln Operation Chapter 3: Freeboard Aerodynamic Phenomena Chapter 4: Granular Flows in Rotary Kilns Chapter 5: Mixing & Segregation Chapter 6: Combustion and Flame Chapter 7: Freeboard Heat Transfer Chapter 8: Heat Transfer Processes in the Rotary Kiln Bed Chapter 9: Mass & Energy Balance Chapter 10: Rotary Kiln Minerals Process Applications ·Covers fluid flow, granular flow, mixing and segregation, and aerodynamics during turbulent mixing and recirculation ·Offers hard-to-find guidance on fuels used for rotary kilns, including fuel options such as natural gas versus coal-fired rotary kilns ·Explains principles of combustion and flame control, heat transfer and heating and material balances

The Rotary Cement Kiln

The Rotary Cement Kiln
Author : Kurt E. Peray
Publisher : California Historical Society
Release Date : 1986
Category : Technology & Engineering
Total pages :396
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An indispensable reference source and training tool not only for kiln operators, but for supervisors and management staff as well. Extensive discussions on pre-heater and pre-calciner operations are included. The appendix includes a section with conversion tables, definitions of common terms relating to rotary kilns, and a suggested outline for a training program for new operators. Contents PART 1. KILN SYSTEMS AND THEORY 1. History 3 2. Types of Rotary Kilns 6 3. The Refractory 17 4. Fuels 37 5. Combustion 44 6. The Flame 63 7. Heat Transfer 83 8. Heat Balances 106 9. The Chemistry of Kiln Feed and Clinker 115 10. Reaction Zones in the Rotary Kiln 141 11. Coating and Ring Formation in a Rotary Kiln 147 12. The Air Circuit in a Rotary Kiln 155 13. Movement of Material Through the Kiln 174 PART II. KILN OPERATING PROCEDURES 199 14. Kiln Operating and Control Methods 201 15. Instrumentation 207 16. Kiln Control Variables 232 17. Fuel Systems 253 18. Clinker Cooler Control 266 19. Kiln Exit-Gas Temperature Control 292 20. Feed-Rate Control 299 2I. Kiln Starts and Shutdowns 308 22. The 27 Basic Kiln Conditions 327 23. Kiln Emergency Conditions 346 24. Safety and Accident Prevention 362 Appendix A: The International System of Units (SI) 367 Appendix B: Weights and Measures 369 Appendix C: Temperature Conversions 378 Appendix D: Kiln Operator's Quiz 382 Index 386

Control of Sulfur Content of Sponge Iron Produced in Rotary Kilns

Control of Sulfur Content of Sponge Iron Produced in Rotary Kilns
Author : R. C. Buehl,E. P. Shoub,J. P. Riott
Publisher : Unknown
Release Date : 1947
Category : Iron, Sponge
Total pages :102
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Limestone Sorbent Regeneration in Externally Fired Rotary Kilns

Limestone Sorbent Regeneration in Externally Fired Rotary Kilns
Author : Anonim
Publisher : Unknown
Release Date : 1979
Category :
Total pages :129
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Externally fired rotary kilns were evaluated for use as regeneration reactors for the spent limestone sorbent from a fluid-bed combustor. Coke and spent sorbent containing approximately 8 wt % sulfur were reacted at temperatures between 960 and 1060/sup 0/C in two laboratory-scale externally fired rotary kilns to produce lime sorbent suitable for reuse, and concentrated SO/sub 2/. It was possible to achieve a high percent of sorbent regeneration, but the SO/sub 2/ concentration in the off-gas was low. Different operating conditions were required to produce a higher concentration of SO/sub 2/ in the off-gas, and under these conditions, the percent of sorbent regeneration was low. Two empirical equations and the shrinking-core reaction-rate model were examined for application to the experimentally determined kinetic data. The shrinking-core model appeared to fit the data better than the empirical equations, and could be a useful predictor of the conversion of sulfated limestone and of the SO/sub 2/ concentration in the off-gas from a rotary-kiln regenerator. The materials used in the construction of one of the laboratory kilns were typical of commercially available production-size rotary kilns that are externally fired. However, the materials of construction were not sufficiently durable to withstand the high SO/sub 2/ concentrations and high temperatures involved in this reaction.

Modeling and Validation of the Siderite Decomposition in a Rotary Kiln

Modeling and Validation of the Siderite Decomposition in a Rotary Kiln
Author : Anonim
Publisher : Unknown
Release Date : 2017
Category :
Total pages :129
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Abstract: The decomposition behavior of siderite in rotary kilns has been insufficiently investigated up to now. In particular, the interaction of the two primary reactions calcination of the carbonate and oxidation of the wustite under the conditions in a rotary kiln are not known. Therefore, experimental investigations were carried out with a selected siderite with regard to the specific properties of bulk bed motion behavior and reaction sequence. An existing process model has been extended by these specific model parameters. Thus, the entire process of siderite decomposition could be simulated. In order to validate the extended process model, experimental investigations were carried out in a technical scale rotary kiln. The results show sufficiently accurate consistency.

The Rotary Kiln

The Rotary Kiln
Author : Victor J. Azbe
Publisher : Unknown
Release Date : 1956
Category : Kilns
Total pages :89
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Carbon Reactivation by Externally-fired Rotary Kiln Furnace

Carbon Reactivation by Externally-fired Rotary Kiln Furnace
Author : Jinglin Zhen,Leon S. Directo
Publisher : Unknown
Release Date : 1980
Category : Carbon, Activated
Total pages :36
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Rotary Kiln Technology

Rotary Kiln Technology
Author : Anonim
Publisher : Unknown
Release Date : 1987
Category : Cement kilns
Total pages :115
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Dimensional Analysis of Solids Transport and Dispersion in a Rotary Kiln

Dimensional Analysis of Solids Transport and Dispersion in a Rotary Kiln
Author : Anonim
Publisher : Unknown
Release Date : 1977
Category :
Total pages :129
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To organize data being obtained in an existing experimental program on the dispersion coefficient for material in a rotating kiln, a dimensional analysis was performed using all of the variables now thought to be relevant. Rotary kilns are being considered for use in the voloxidation process for the recovery of tritium from spent nuclear power reactor fuels. Design for the efficient recovery of tritium stipulates a residence time distribution for material within the kiln; therefore, a consideration of material dispersion is important. The study revealed that the system is fairly tightly constrained. Of all possible dimensionless groups formed from the process variables, only three remained after those groups consisting of ratios of length were extracted and allowance was made for implicit relations among variables. The set that describes the system includes the velocity number, the Watt number, and the fraction of the kiln filled with solids. Since the velocity number divided by the operating slope of the kiln behaves as a constant (at least for first-order effects), the program should correlate the Watt number with fraction full and the dimensionless numbers that relate the geometry of the system, including size of the feed material and flight dimensions.

Panel Session on Dust Return to Rotary Kilns

Panel Session on Dust Return to Rotary Kilns
Author : J. Laneuvill
Publisher : Unknown
Release Date : 1977
Category : Clay
Total pages :74
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Flame Simulation in Rotary Kilns Using Computational Fluid Dynamics

Flame Simulation in Rotary Kilns Using Computational Fluid Dynamics
Author : Hassan Fawzy Mohamed Elattar,Eckehard Specht,Dominique Thévenin,Ulrich krause
Publisher : Unknown
Release Date : 2011
Category :
Total pages :233
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