煤液化动力学模型的研究~+

根据煤结构的不均匀性及煤液化中包含大量串联和并联反应的事实,提出了一模拟煤液化的数学模型。该模型把液化过程处理为两组不可逆反应的串联(即煤裂解生成沥青烯和前沥青烯;沥青烯和前沥青烯生成油),其中每组都包含一系列不同组分的平行反应,从理论上可认为这些反应的活化能服从高斯分布。这一模型能较好地描述同一煤中各组分液化难易程度的不同,也合理地解释了煤液化中表现反应活化能随转化率增加而上升的现象。由此得到的理论值不仅和实验数据一致,也和文献值较好符合。

Model for Coal Liquefaction Reactions

Based on the non-uniform constitution of coal, a methamatical model has been developed to simulate coal liquefaction. The model considers the overall liquefaction to be achieved in two stages. Both stages consist of a series of paralled irreversible reactions, of which the activation energies obey normal distribution. The model gives rational expression to the phenomenen that some parts of coal are easy to liquefy but the others are not. It also sucessfully predicts the increase of apparent activation energies with coal conversion. The theoretical values derived from this model show good agreement with our experimental results, as well as with the data reported in the literature.