Abstract
With the help of Aspen Plus, a two-dimensional unsteady CFD model is developed to simulate the coal gasification process in a fixed bed gasifier. A developed and validated two dimensional CFD model for coal gasification has been used to predict and assess the viability of the syngas generation from coal gasification employing the updraft fixed bed gasifier. The process rate model and the sub-model of gas generation are determined. The particle size variation and char burning during gasification are also taken into account. In order to verify the model and increase the understanding of gasification characteristics, a set of experiments and numerical comparisons have been carried out. The simulated results in the bed are used to predict the composition of syngas and the conversion of carbon. The model proposed in this paper is a promising tool for simulating the coal gasification process in a fixed bed gasifier.
Highlights
With the economic development in our country, the steel industry is facing the transformation and upgrading, the demand for coal is declining, and a severe overcapacity appears
The model proposed in this paper is a promising tool for simulating the coal gasification process in a fixed bed gasifier
The present work uses the mathematical model of Aspen Plus to establish a fixed bed gasification reactor, to simulate the coal gasification process, the simulation data and the experimental data is in good agreement, as shown from the relative errors between the experimental and simulated values
Summary
With the economic development in our country, the steel industry is facing the transformation and upgrading, the demand for coal is declining, and a severe overcapacity appears. The results show that the model is highly consistent with the actual operating results of BGL gasifier, and can be applied to the calculation of chemical and thermodynamic equilibrium of some gasification processes with complex reaction mechanism, and the influence of different operation parameters on the gasification performance of BGL gasifier is studied. The proposed model can be used in the future to simulate and analyze the effects of nozzle structure, position, dip angle, gasification flux and composition on the reaction zone temperature, component concentration, coal carbon conversion and so on, Oxygen fixed bed pressurized gasifier to provide optimal design support. Aspen plus set up a set of gasification coal grading oxygen fixed bed gasifier mathematical model for the future study of oxygen and steam and preheating temperature of gasification syngas gas production and effective gas composition impact equipment operating process parameters to provide a reference
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