Title: ADVANCED COMPUTATIONAL MODEL FOR THREE-PHASE SLURRY REACTORS

Abstract

In the second year of the project, the Eulerian-Lagrangian formulation for analyzing three-phase slurry flows in a bubble column is further developed. The approach uses an Eulerian analysis of liquid flows in the bubble column, and makes use of the Lagrangian trajectory analysis for the bubbles and particle motions. An experimental set for studying a two-dimensional bubble column is also developed. The operation of the bubble column is being tested and diagnostic methodology for quantitative measurements is being developed. An Eulerian computational model for the flow condition in the two-dimensional bubble column is also being developed. The liquid and bubble motions are being analyzed and the results are being compared with the experimental setup. Solid-fluid mixture flows in ducts and passages at different angle of orientations were analyzed. The model predictions were compared with the experimental data and good agreement was found. Gravity chute flows of solid-liquid mixtures is also being studied. Further progress was also made in developing a thermodynamically consistent model for multiphase slurry flows with and without chemical reaction in a state of turbulent motion. The balance laws are obtained and the constitutive laws are being developed. Progress was also made in measuring concentration and velocity ofmore » particles of different sizes near a wall in a duct flow. The technique of Phase-Doppler anemometry was used in these studies. The general objective of this project is to provide the needed fundamental understanding of three-phase slurry reactors in Fischer-Tropsch (F-T) liquid fuel synthesis. The other main goal is to develop a computational capability for predicting the transport and processing of three-phase coal slurries. The specific objectives are: (1) To develop a thermodynamically consistent rate-dependent anisotropic model for multiphase slurry flows with and without chemical reaction for application to coal liquefaction. Also establish the material parameters of the model. (2) To provide experimental data for phasic fluctuation and mean velocities, as well as the solid volume fraction in the shear flow devices. (3) To develop an accurate computational capability incorporating the new rate-dependent and anisotropic model for analyzing reacting and nonreacting slurry flows, and to solve a number of technologically important problems related to Fischer-Tropsch (F-T) liquid fuel production processes. (4) To verify the validity of the developed model by comparing the predicted results with the performed and the available experimental data under idealized conditions.« less

Authors:

Ahmadi, Goodarz

Publication Date:

Mon Oct 01 00:00:00 EDT 2001

Research Org.:

Clarkson University (US)

Sponsoring Org.:

(US)

OSTI Identifier:

825380

DOE Contract Number:  

FG26-99FT40584

Resource Type:

Technical Report

Resource Relation:

Other Information: PBD: 1 Oct 2001

Country of Publication:

United States

Language:

English

Subject:

01 COAL, LIGNITE, AND PEAT; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BUBBLES; CHEMICAL REACTIONS; COAL; COAL LIQUEFACTION; DUCTS; FLUCTUATIONS; LAGRANGIAN FUNCTION; LIQUID FLOW; LIQUID FUELS; MIXTURES; SHEAR; SLURRIES; SLURRY REACTORS; SYNTHESIS; VELOCITY