Abstract
Three-dimensional computational fluid dynamics (CFD) modeling of the gasification performance in a one-stage, entrained-bed coal gasifier (Shell Coal Gasification Process (SCGP) gasifier) was performed, for the first time. The parametric study used various O2/coal and steam/coal ratios, and the modeling used a commercial code, ANSYS FLUENT. CFD modeling was conducted by solving the steady-state Navier–Stokes and energy equations using the Eulerian–Lagrangian method. Gas-phase chemical reactions were solved with the Finite–Rate/Eddy–Dissipation Model. The CFD model was verified with actual operating data of Demkolec demo Integrated Gasification Combined Cycle (IGCC) facility in Netherlands that used Drayton coal. For Illinois #6 coal, the CFD model was compared with ASPEN Plus results reported in National Energy Technology Laboratory (NETL). For design coal used in the SCGP gasifier in Korea, carbon conversion efficiency, cold gas efficiency, temperature, and species mole fractions at the gasifier exit were calculated and the results were compared with those obtained by using ASPEN Plus-Kinetic. The optimal O2/coal and steam/coal ratios were 0.7 and 0.05, respectively, for the selected operating conditions.
Highlights
Environmental and fuel supply concerns are driving the demand to develop more efficient uses of fossil fuel by energy industries
Gasification occurs when insufficient oxidant is supplied; the amount of oxygen supplied for coal gasification is usually 1/3 to 1/5 of that supplied for complete combustion [5]
Carbon conversion, cold gas efficiencies, temperature, and species mole fractions at the gasifier exit were calculated and the results were compared with those obtained by using ASPEN Plus-Kinetic
Summary
Environmental and fuel supply concerns are driving the demand to develop more efficient uses of fossil fuel by energy industries. Combined Cycle (IGCC) processes rather than conventional or super critical Rankine-based cycles, which would benefit the increased use of hydrogen fuel. The use of coal in IGCC is a promising alternative to combustion and is already commercially cost-competitive in many locations [1,2,3,4]. Gasification occurs when insufficient oxidant is supplied; the amount of oxygen supplied for coal gasification is usually 1/3 to 1/5 of that supplied for complete combustion [5]. Commercial coal gasification technologies are classified by the feed flow pattern in the gasifier, such as fixed-, fluidized-, and entrained-bed gasification technologies [6]. Entrained-bed gasifiers have higher fuel conversion rates and shorter solid residence times than other gasifiers because the feedstock particles are usually ground to smaller than 1 mm [7]
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