Texaco煤气化炉数学模型的研究——建模部分

Study on Mathematical Model of Texaco Gasifier-Modeling

建立了一个预测 Texaco煤气化炉性能的数学模型。建模采用“小室模型”方法 ,将气化炉分为多段 ,分别建立 8种气体成分、固体和碳质量平衡以及总体能量平衡。模型详细考虑了气固流动过程以及包括水煤气反应、CO2 还原、变换反应等 1 0多种均相和异相反应在内的动力学反应过程。与常见采用化学平衡假定的气化炉性能预测模型相比 ,本模型的突出优点在于如下方面 :首先 ,可以反映气化炉几何尺寸和结构影响 ;其次 ,可以计算气化炉主要性能参数 (如煤气成分和浓度、温度以及碳转化率等 )以及它们的分布特性 ;第三 ,模型反映的是有限停留时间条件下、尚未达到化学平衡的产物 ,这与气化炉实际运行情况更加贴切。对 3个煤种的计算结果与试验数据的对比表明 :本模型具有较大的可信度和应用价值。图 3表 3参

A mathematical model is established to predict the performance of Texaco coal gasifier. Cell model is employed to set up the mass balance of 8 gas components, solid flow, carbon flow and total energy balance. More than ten kinetic chemical reactions are considered in detail. These make the model have the following advantages compared to common gasifier models that adapt chemical equilibrium assumption. Firstly, the influence of gasifier geometry and structure can be reflected. Secondly, the model has the ability to calculate the distribution and changing process of most of the important operation parameters, such as temperature, gas concentration and carbon conversion rate. Thirdly, the model is obviously closer to reality, because the syngas composition predicted by the model is under the condition of limited residence time rather than under chemical equilibrium assumption. The model is validated by some experimental results published in literature and could be used for more applications. Figs 3, tables 3 and refs 6.