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Oil Shale Pyrolysis: Benchscale Experimental

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Oil Shale Pyrolysis: Benchscale Experimental OIL SHALE PYROLYSIS: BENCHSCALE EXPERIMENTAL STUDIES AND MODELING by Pankaj Tiwari A dissertation submitted to the faculty of The University of Utah in partial fulfillment of the requirements for the degree of Doctor of Philosophy Department of Chemical Engineering The University of Utah August 2012 Copyright ©Pankaj Tiwari 2012 All Rights Reserved The University of Utah G r a d u a t e S c h o o l STATEMENT OF DISSERTATION APPROVAL The dissertation of Pankaj Tiwari has been approved by the following supervisory committee members: Milind D. Deo , Chair 5/30/2012 Eric G. Eddings , Member 5/30/2012 Edward M. Trujillo , Member 5/30/2012 Hong Y. Sohn , Member 5/30/2012 Edward M. Eyring , Member 5/30/2012 and by JoAnn Lighty , Chair of the Department of Chemical Engineering and by Charles A. Wight, Dean of The Graduate School. ABSTRACT Oil shale is a complex material that is composed of organic matter, mineral matrix and trace amount of bound and/or unbound water. The endothermic decomposition of the organic matter generates liquid and gaseous products. The yield and the desired quality of the product (shale oil) are controlled by the operational conditions. Pyrolysis of a small batch of finely ground oil shale provides chemically controlled intrinsic kinetic rate of organic decomposition. Pyrolysis of large size block/core samples is governed by temperature distributions and the time required for product expulsion. Heat and mass transfer considerations influence the distribution of products and alter the yield and quality. The experimental studies on oil shale pyrolysis performed in this work were designed to understand the relevant coupled phenomena at multiple scales. Oil shale in the Mahogany zone of the Green River formation was used in all experiments. Experiments were conducted at four scales, powdered samples (100 mesh) and core samples of ¾”, 1” and 2.5” diameters. Batch, semibatch and continuous flow pyrolysis experiments were designed to study the effect of temperature (300°C to 500°C), heating rate (1°C/min to 10°C/min), pressure (ambient and 500 psi) and size of the sample on product formation. Comprehensive analyses were performed on reactants and products - liquid, gas and spent shale. The activation energies of organic decomposition derived from advanced isoconversional method were in the range of 93 to 245 kJ/mol with an uncertainty of about 10%. Lighter hydrocarbons evolved slightly earlier and their amounts were higher in comparison to heavier hydrocarbons. Higher heating rates generated more alkenes compared to respective alkanes and as the carbon number increased, this ratio decreased. Oil yield decreased and the amount of coke formed increased as the sample size and/or pressure increased. Higher temperature, higher heating rate and low pressure favored more oil yield. The quality of oil improved with an increase in the temperature, pressure and size of the sample. A model in COMSOL multiphysics platform was developed. A general kinetic model was integrated with important physical and chemical phenomena that occur during pyrolysis. The secondary reactions of coking and cracking in the product phase were addressed. The multiscale experimental data generated and the models developed, provide an understanding of the simultaneous effects of chemical kinetics, heat and mass transfers on oil quality and yield. The comprehensive data collected in this study will help advance the move to large scale oil production from the pyrolysis of shale. iv To My Family TABLE OF CONTENTS ABSTRACT…………………………………………...…………………………………iii LIST OF TABLES……………………………………….….……………………………ix LIST OF FIGURES………………………………………………………………..…… xii ABBREVIATIONS..………………………………………………………………… ...xx NOMENCLATURE………………………………………………………………..…..xxii ACKNOWLEDGMENTS……………………………………………………………...xxv 1. INTRODUCTION .......................................................................................................... 1 1.1. Research Objectives ................................................................................................. 3 1.2. Background .............................................................................................................. 4 1.3. Significance of the Research and Original Contribution .......................................... 7 1.4. Thesis Outline ........................................................................................................... 8 2. LITERATURE REVIEW ............................................................................................. 10 2.1. Oil Shale Pyrolysis Process .................................................................................... 10 2.2. Mechanism of Oil Shale Pyrolysis and Product Formation ................................... 13 2.3. Complexity Involved in the Process ...................................................................... 16 2.4. Kinetic Analysis of Organic Decomposition ......................................................... 17 2.4.1. Isothermal and Nonisothermal Kinetic Studies ............................................... 20 2.5. Compositional Analysis of Pyrolysis Products ...................................................... 21 2.6. Effect of Operational Parameters on Oil Shale Pyrolysis ...................................... 26 2.7. Modeling of Oil Shale Pyrolysis ............................................................................ 30 2.8. Hydrous Pyrolysis .................................................................................................. 32 3. EXPERIMENTAL METHODS AND ANALYTICAL TECHNIQUES ..................... 33 3.1 Experimental Section .............................................................................................. 33 3.1.1. Material............................................................................................................ 33 3.1.2. Experimental Procedure .................................................................................. 34 3.2. Analytical Techniques ............................................................................................ 43 3.2.1. Material Characterization ................................................................................ 43 3.2.2. Compositional Analysis................................................................................... 45 3.2.3. Physical Properties Estimation ........................................................................ 49 4. RAW MATERIAL CHARACTERIZATION .............................................................. 51 4.1. Elemental Analysis ................................................................................................. 51 4.2. Thermal Gravimetric Analysis ............................................................................... 51 4.3. X- Ray Diffraction Analysis .................................................................................. 55 4.4. TGA-DSC Analysis................................................................................................ 57 4.5. High Pressure TGA Pyrolysis ................................................................................ 57 5. KINETIC ANALYSIS OF OIL SHALE PYROLYSIS TGA DATA .......................... 61 5.1. Nonisothermal TGA Pyrolysis of Oil Shale ........................................................... 61 5.2. Kinetic Analysis – Advanced Isoconversional Methods........................................ 64 5.2.1. Kinetic Analysis – Advanced Parameter Fitting Approaches ......................... 67 5.3. Kinetic Analysis Results – Advanced Isoconversional Methods ........................... 67 5.3.1. Kinetic Analysis Results– Advanced Parameter Fitting Models .................... 73 5.3.2. Comparison of the Different Kinetic Models Used ......................................... 75 5.4. Kinetics of Isothermal Decomposition ................................................................... 80 5.5. Pyrolysis Kinetics of Different Oil Shales ............................................................. 83 6. COMPOSITIONAL AND KINETIC ANALYSIS USING TGA-MS ......................... 84 6.1. TGMS Analysis of Powdered Oil Shale (PO) ........................................................ 85 6.2. Derivation of Kinetic Parameters ........................................................................... 94 7. MULTISCALE PYROLYSIS AND BULK PRODUCT ANALYSIS ........................ 98 7.1. Pyrolysis of Powdered Samples ............................................................................. 98 7.1.1. Batch Pyrolysis of Powdered Samples ............................................................ 98 7.1.2. Semibatch Pyrolysis of Powdered Samples .................................................. 102 7.1.3. Continuous Flow Pyrolysis of Powdered Samples ........................................ 106 7.2. Pyrolysis of 3/4” Core Samples ........................................................................... 107 7.2.1. Continuous Flow Pyrolysis of ¾” Core – Effect of Temperature ................. 107 7.3. Pyrolysis of 1” Core Samples............................................................................... 122 7.4. Pyrolysis of 2.5” Core Samples ........................................................................... 128 7.5. Summary of Multiscale (benchscale) Pyrolysis ................................................... 132 8. OIL SHALE PYROLYSIS: HYDROUS TREATMENT .......................................... 137 8.1. Pyrolysis of Water-Soaked Oil Shale Samples ...................................................
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