原料性质对焦化行为的影响

EFFECT OF MATERIAL PROPERTIES ON COKING PERFORMANCE

对减压渣油W2、催化裂化油浆和2种煤焦油的焦化性能进行了研究,结果表明,原料油分子大,烷基碳数高,芳碳数低,则焦化产物的液相收率高,焦炭收率低。根据热失重实验数据,采用无限多平行反应模型求取焦化过程动力学参数,在350-510℃温度范围内,焦化反应符合一级反应动力学模型,其表观活化能Ea在18.04-77.29kJ/mol之间,4种原料油活化能由大到小的排序为：煤焦油2〉减压渣油〉煤焦油1〉催化裂化油浆。采用模糊聚类分析方法将15个影响焦化反应活化能的因素分成4类,结果表明：密度越大、总碳数越高,则活化能Ea越小;残炭和芳碳含量越高,则活化能Ea越大。

The coking performance of coal tar 1,coal tar 2,vacuum residue W2 and FCC slurry was studied.The results show that the liquid yield increases and coke yield decreased if the raw oils are characterized by larger molecule,rich in paraffin and less in aromatic.The kinetics equation and parameters was obtained by infinitely parallel reaction model based on the data of thermal analyzer.The coking reaction is a first-order reaction and the apparent activation energy（Ea）is 18.04—77.29kJ/mol in350—510 ℃.The order of activation energy of four raw materials is coal tar 2vacuum residue W2coal tar 1slurry.The factors influencing activation energy Ea was divided into 4classes by the fuzzy clustering analysis method.It is found that the higher density（ρ）and the total number of carbon（CT）of raw oils,the lower the activation energy is.However,the more the residue carbon（CR）and the number of aromatic carbon（CA）,the higher the activation energy is.