Development and application of coal gasification reactor model based on Gibbs free energy minimization method
In the present study,the coal gasification module was explored by integrating the models of coal pyrolysis process and gasification process.The composition of coal pyrolysis was calculated according to the pyrolysis model.The equilibrium model was constructed with the principle of Gibbs free energy minimization.The model of coal gasification process was solved by converting the optimization problem with equilibrium constraint into an unconstrained optimization problem with the Rand method.The accuracy of the explored coal gasification model was examined with industrial data.The effects of coal slurry concentration and oxygen-coal ratio on the composition of gasification products were studied with the new coal gasification reactor module.The results indicated that the volume fraction of effective gas increased from 71.6%to 81.2%with the increase of coal slurry concentration from 52.5%to 65.5%,and it increased to 77.75%and then decreased with the oxygen-coal ratio increased from 491 to 560.The effective gas volume fraction increased with the increase of coal slurry concentration,and the fraction increased to the maximum value and then decreased with the increase of oxygen coal ratio concentration.The developed coal gasification module could accurately and reliably simulate the coal gasification process,and it had an important practical value.
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