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NUMERICAL ANALYSIS OF 2 T/DAY ENTRAINED FLOW COAL GASIFIER
- Effect of the Shape of the Gasifier -

DOI: 10.1615/IHTC13.p22.370
page 10

Y. Matsushita
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, Japan

A. Goto
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, Japan

Y. Morozumi
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, Japan

Hideyuki Aoki
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, Japan

Takatoshi Miura
Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, Japan

Abstract

In our group, general-purpose and original computational fluid dynamics (CFD) code named Revolutionary Software Orchestrated Reactions in Turbulent flow (RESORT) is developed in order to analyse reacting thermo fluid dynamics as a national project called Brain-C program in Center of Coal Utilization Japan, CCUJ (now named JCOAL) and New Energy and Industrial Technology Development Organization, NEDO. The gasifier is numerically analysed by RESORT in order to predict physical and chemical phenomena in the gasifier. Euler-Lagrange approach for gas and particle phase is employed and Navier-Stokes equations are descretized by finite volume method. k-ε two-equation model is employed as a turbulence model and wall boundary is adapted by "Wall function". Pressure field and velocity field are coupled by SIMPLER and discretized equations are iteratively solved by Bi-CGSTAB until convergence is obtained. Radiative heat transfer is described by 6-FLUX method and radiative property is estimated by Weighted Sum of Gray Gasses Model, WSGGM. As the first approach, general coal combustion schemes were applied to the gasifier simulator. Thus, devolatilization, three heterogeneous reactions, Char-O2, Char-CO2, and Char-H2O and four homogeneous reactions, VM (volatile matter)-O2, CO-O2, H2-O2 and C3H8-O2 were considered in the mathematical model. Temperature, the mole fraction of chemical species and the char conversion ratio were compared with available experimental data, respectively. As a result, the calculated results were in good agreement with experimental ones in temperature and also in the mole fraction of CO, CO2 and H2 in the combustor part of the gasifier. Fundamental phenomena in the gasifier were understood by both calculated and experimental results. Furthermore, the different throat diameter of the gasifier, as the shape of the gasifier, was also investigated. The smaller the throat dimeter was, the higher CO mole fraction was in the upper part of the combustor part and also in the heat recovery part.

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Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION