延迟焦化结构导向集总模型应用研究

采用22个结构向量描述渣油分子,构建了7 004种渣油分子集总,结合模拟退火算法提出了一种模拟计算渣油分子组成的方法。制定了92条反应规则用以描述渣油延迟焦化分子反应行为。在对工业延迟焦化工艺进行一定程度简化和假设的基础上,建立了一个用以预测延迟焦化产物分布的结构导向集总模型。通过模型预测结果和小试试验结果对比发现,该模型在不同延迟焦化工艺条件下对不同原料得到的产物分布均具有较好的预测可靠性。利用该模型计算了不同原料渣油掺炼以及渣油掺炼回收废道路沥青共焦化对延迟焦化液体收率的影响。计算结果表明:这两种方案都能有效提高延迟焦化液体收率。计算结果经小型试验得到了证实。

Study on application of structure-oriented lumping model for delayed coking

22 structure vectors are applied to describe the residue oil molecule,and 7 004 residue molecular lumps are constructed.A method for simulation calculation of residue molecular compositions is proposed based upon the simulated annealing calculation method.92 reaction rules have been developed to describe reaction behavior of residue molecules in delayed coking reaction.On the basis of simplification of delayed coking process and assumptions,a structure-oriented lumping is established for the prediction of product distribution of delayed coking.The comparison of prediction results and the results of pilot plant tests have found that this model offers a good prediction of product distribution of different feeds under different delayed coking process conditions.The model is applied to calculate the impact of delayed coking with feeds blended with different residues and feeds of residues blended with asphalt.The calculation results demonstrate that the both cases can improve the liquid yield of delayed coking,and the calculation results have been verified by pilot plant tests.