ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR)TECHNOLOGY

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column 0reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors

Comparison of Single- and Two-Bubble Class Gas-Liquid Recirculation Models - Application to Pilot-Plant Radioactive Tracer Studies during Methanol Synthesis

Radioactive Gas Tracer Measurements Conducted during Liquid-Phase Methanol Synthesis from Syngas in a Pilot-Scale Slurry Bubble Column at the Alternate Fuels Development Unit (AFDU), La Porte Have Been Compared with Simulations from Two Mechanistic Reactor Models - Single-Bubble Class Model (SBCM) and Two-Bubble Class Model (TBCM). the Model Parameters Are Estimated from an Independent Sub-Model Gas and Liquid Recirculation, and the Long-Time-Averaged Slip Velocity between the Gas and Liquid/slurry in the Column Center Can Be as High as 50-60 Cm/s Depending on the Operating Conditions. Comparison of Experimental Data with Simulation Results from the Two Models Indicates that Accurate Description of Interphase Gas-Liquid Mass Transfer is Crucial to the Reliable Prediction of Tracer Responses. Coupled with a Correct Description of Gas and Liquid Recirculation, the Models Presented Here Provides a Simple and Fundamentally based Methodology for Design and Scale-Up of Bubble Column Reactors. © 2001 Published by Elsevier Science Ltd

Hydrodynamics of Churn Turbulent Bubble Columns: Gas-Liquid Recirculation and Mechanistic Modeling

A Phenomenological (Mechanistic) Model Has Been Developed for Describing the Gas and Liquid/slurry Phase Mixing in Churn Turbulent Bubble Columns. the Gas and Liquid Phase Recirculation Rates in the Reactor, Which Are Needed as Inputs to the Mechanistic Reactor Model Are Estimated Via a Sub-Model Which Uses the Two-Fluid Approach in Solving the Navier-Stokes Equations. This Sub-Model Estimates the Effective Bubble Diameter in the Reactor Cross-Section and Provides a Consistent Basis for the Estimation of the Volumetric Mass Transfer Coefficients. the Strategy for the Numerical Solution of the Sub-Model Equations is Presented Along with the Simulation Results for a Few Cases. the overall Reactor Model Has Been Tested Against Experimental Data from Radioactive Gas Tracer Experiments Conducted at the Alternate Fuels Development Unit (AFDU), La Porte, TX under Conditions of Methanol Synthesis

Fluid Dynamic Parameters in Bubble Columns with Internals

The Knowledge of Gas Holdup, Liquid Recirculation and Turbulent Parameters is Important for Design and Performance Calculation of Bubble Column Reactors. Although Numerous Experimental Studies Have Been Reported on This Subject, Most Are Point Measurements Limited to Columns Without Internals Operated at Low Gas Velocities. in This Study, We Present the Results Obtained for the Gas Holdup Profiles, Time-Averaged Liquid Velocity Profiles, Turbulent Stresses and Eddy Diffusivities (Radial and Axial) Obtained in a 18″ (44 Cm) Diameter Column Without and with Internals Similar to Those Used in Industrial Scale Units (E.g., Heat Exchanger Tubes) using Both Air/water and Air/drakeoil 10 (Viscosity ~30 CP) at Gas Superficial Velocities of 2, 5 and 10 Cm/s. the Scale-Up Procedure Suggested by Degaleesan (1997) is Critically Examined in Light of These Results

ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR) TECHNOLOGY

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors

ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR) TECHNOLOGY

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column 0reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors

Engineering development of slurry bubble column recactor(SBCR) technology

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors

Engineering Development of Slurry Bubble Column Reactor (SBCR) Technology: Final quarterly technical progress no. 2, 1 July - 30 September 1995

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors

Gas Holdup Distributions in Large-Diameter Bubble Columns Measured by Computed Tomography

Using the Computed Tomography (CT) and Computer Automated Radioactive Particle Tracking (CARPT) Facilities at the Chemical Reaction Engineering Laboratory (CREL), Time-Averaged Gas Holdup Distributions and Liquid Recirculation Velocities Were Measured in a 44 Cm Diameter Bubble Column for Air-Water and Air-Drakeoil Systems at 2, 5, and 10 Cm/s Superficial Gas Velocities, Which Cover Bubbly, Transition and Churn-Turbulent Flow Regimes, Respectively. Gas Holdup Was Found to Increase Only Slightly with the Increase in Axial Distance from the Distributor, But Increased Significantly with the Increase in Superficial Gas Velocity, as Expected. a Lower Gas Holdup Was Observed in the Air-Drakeoil System Than in the Air-Water System. This Could Be Predominantly Attributed to the Formation of Large Bubbles in the Former Case Due to the Higher Viscosity of Drakeoil (Approximately 0.03 Pas (= 30 Cp)). at High Superficial Gas Velocities, the Time-Averaged Cross-Sectional Gas Holdup Distributions Were Almost Symmetric for Both Air-Water and Air-Drakeoil Systems. However, at 2 Cm/s Superficial Gas Velocity, an Asymmetry in the Holdup Distribution Was Observed, Which Manifested itself in an Asymmetric Liquid Recirculation Pattern. at All Gas Velocities, the Radial Gas Holdup Distribution for the Air-Water System Was Steeper Than that for the Air-=drakeoil System, Yielding Steeper Radial Liquid Velocity Profiles. Comparison of the Gas Holdup Obtained in the 44 Cm Diameter Column and that Obtained in a 10 Cm Diameter Column is Discussed