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BL
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| Record Number
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889008
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| Main Entry
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Yuan, Ye
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| Title & Author
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Optic diagnostics on pulverized coal particles combustion dynamics and alkali metal release behavior /\ Ye Yuan.
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| Publication Statement
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Sinagpore :: Springer,, 2019.
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| Series Statement
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Springer theses
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| Page. NO
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1 online resource
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| ISBN
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9789811048128
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: 9789811048135
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: 9789811048142
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: 9811048126
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: 9811048134
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: 9811048142
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9789811048128
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| Notes
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"Doctoral these accepted by Tsinghua University, Beijing, China."
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| Bibliographies/Indexes
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Includes bibliographical references.
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| Contents
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Intro; Supervisor's Foreword; Abstract; Parts of this thesis have been published in the following journal articles; Acknowledgements; Contents; Nomenclature; 1 Introduction; 1.1 Background; 1.1.1 Scientific Problems; 1.2 Related Research; 1.2.1 Experimental Methods for Coal Combustion; 1.2.2 Devolatilization Process of Coal Combustion; 1.2.3 Pulverized Coal Ignition; 1.2.4 Dynamic Alkali Metal Release Behavior During Coal Combustion; 1.2.5 Optic Diagnostic Technique for Heterogeneous Combustion; 1.2.6 Char Particle Burnout; 1.2.7 Oxy-Fuel Combustion of Pulverized Coal Particles
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1.3 Research ContentsReferences; 2 Experimental and Theoretical Investigation of Coal Devolatilization; 2.1 Hencken Combustion System; 2.1.1 Hencken Flat Flame Burner; 2.1.2 Novel Particle Feeder Using De-agglomeration Technique; 2.1.3 Optic Experimental Setup; 2.2 Fuel Properties and Selection; 2.3 Multi Filter CH* Chemiluminescence Detection Method; 2.4 Experimental Coal Devolatilization Research; 2.4.1 The Temperature Effect on Coal Devolatilization; 2.4.2 The Oxygen Effect on Coal Devolatilization; 2.5 Theoretical Coal Devolatilization Research; 2.5.1 Devolatlization Rate
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2.5.2 Volatile Combustion2.6 Conclusions; References; 3 Ignition Mechanism Research on Dispersed Pulverized Coal Particles; 3.1 Experiment; 3.1.1 Experiment Set up; 3.1.2 Experimental Method; 3.2 Ignition Mechanism of Pulverized Coal Particle; 3.2.1 The Transition of Ignition Mechanism; 3.2.2 Time Scale Analysis of Coal Particles Ignition; 3.3 Experiment Research on Characteristic Ignition Time; 3.3.1 Effect of Ambient Temperature on Ignition Time; 3.3.2 Effect of Oxygen Mole Fraction on Ignition Time; 3.3.3 Effect of Coal Rank on Ignition Time; 3.3.4 Effect Oxy-Fuel Ambient on Ignition Time
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3.4 Theoretical Research on Characteristic Ignition Time3.4.1 Transient Model for Coal Ignition; 3.4.2 Solution for Ignition; 3.4.3 Theoretical Prediction for Coal Ignition; 3.5 Conclusions; References; 4 Dynamic Behavior of Na Release During Coal Combustion; 4.1 Experiment Methods; 4.1.1 Experiment Set up; 4.1.2 Low-Intensity LIBS; 4.2 Low-Intensity LIBS in Coal Combustion; 4.2.1 Metal LIBS Signal in Coal Combustion; 4.2.2 Na Emission Spectra in Coal Combustion; 4.2.3 Time Resolution of Na Low-Intensity LIBS Signal; 4.2.4 Na Low-Intensity LIBS Signal Variation with Laser Energy
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4.3 Dynamic Sodium Release4.4 Dynamic Behavior of Na Release; 4.4.1 Effect of Ambient Temperature on Na Release; 4.4.2 Effect of Coal on Na Release; 4.4.3 Effect of Coal on Na Release; 4.5 Effect of Na Release on Fine Particulate Matter Formation; 4.6 Conclusions; References; 5 Experimental and Theoretical Research on Coal Surface Temperature; 5.1 Introduction; 5.2 RGB Color Pyrometry; 5.2.1 Camera Calibration; 5.2.2 RGB Color Pyrometry; 5.2.3 RGB Color Pyrometry Calibration; 5.3 Coal Particle Temperature Measurement; 5.3.1 Particle Temperature During Low Temperature Ignition
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| Abstract
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This book focuses on pulverized coal particle devolatilization, ignition, alkali metal release behavior, and burnout temperature using several novel optic diagnostic methods on a Hencken multi-flat flame burner. Firstly, it presents a novel multi-filter technique to detect the CH* signal during coal ignition, which can be used to characterize the volatile release and reaction process. It then offers observations on the prevalent transition from heterogeneous ignition to hetero-homogeneous ignition due to ambient temperature based on visible light signal diagnostics. By utilizing the gap between the excitation energies of the gas and particle phases, a new low-intensity laser-induced breakdown spectroscopy (PS-LIBS) is developed to identify the presence of sodium in the particle or gas phase along the combustion process. For the first time, the in-situ verification of the gas phase Na release accompanying coal devolatilization is fulfilled when the ambient temperature is high enough. In fact, particle temperature plays a vital role in the coal burnout process and ash particle formation. The last part of the book uses RGB color pyrometry and the CBK model to study the char particle temperature on a Hencken burner. It offers readers valuable information on the technique of coal ignition and combustion diagnostics as well as coal combustion characteristics.
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| Subject
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Coal-- Combustion.
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| Subject
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Coal-- Combustion.
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| Subject
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TECHNOLOGY ENGINEERING-- Chemical Biochemical.
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| Dewey Classification
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662.6/22
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| LC Classification
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TP325
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