Abstract
A one-dimensional reactor model was developed to simulate the performance of an entrained flow gasifier under various operating conditions. The model combined the plug flow reactor (PFR) model with the well-stirred reactor (WSR) model. Reaction kinetics was considered together with gas diffusion for the solid-phase reactions in the PFR model, while equilibrium was considered for the gas-phase reactions in the WSR model. The differential and algebraic equations of mass balance and energy balance were solved by a robust ODE solver, i.e., an semi-implicit Runge–Kutta method, and by a nonlinear algebraic solver, respectively. The computed gasifier performance was validated against experimental data from the literature. The difference in product gas concentration from the equilibrium model, and the underlying mechanisms were discussed further. The optimal condition was found after parameter studies were made for various operating conditions.
Highlights
There is growing interest in entrained flow gasifiers to produce synthesis gas and generate electric power
Reaction kinetics and gas diffusion were considered for the solid-phase reactions in the plug flow reactor (PFR) model, while equilibrium was considered for the gas-phase reactions in the well-stirred reactor (WSR) model
A steady-state reactor model was developed for the entrained flow coal gasification process
Summary
There is growing interest in entrained flow gasifiers to produce synthesis gas and generate electric power. A two-phase approach to account for unconverted carbon in the solid phase has been implemented by using an equilibrium model [5,6,7] In these works, the variation of product gas composition with oxygen and steam/fuel ratio was evaluated and described in more detail. Wu et al, used a zonal approach and the PFR model requiring kinetic parameters for all gas-phase and solid-phase reactions [11] Their model validity was assessed by a comparison of the computed results with previous experimental data at a single oxygen/coal ratio. A one-dimensional reactor model was developed to simulate the performance of an entrained flow gasifier, which focused on carbon conversion This model combined the PFR model with the WSR model. The difference from the equilibrium data and the underlying mechanisms were discussed further
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