The reaction mechanism model of 1.4 Mt/a ethylene cracker unit was established by us-ing SPYRO process simulation software.And the ef-fects of mixing naphtha raw material with aromatic extraction residual oil on ethylene yield and opera-tion cycle of ethylene plant were investigated.The results showed that the model could be applied to the simulation and optimization of raw materials in ethy-lene cracking units.Blending aromatic raffinate into heavy mixed naphtha or light mixed naphtha,had little effect on ethylene yield.When m(heavy mixed naphtha)/m(aromatic raffinate)was 1∶1,the resi-dence time of raw materials in the furnace tube was the shortest.It was estimated that in one operation cycle,under the condition of relatively weighted mixed naphtha cracking alone,it could extend oper-ate time for 2 d,and 8 d in one year.However,light naphtha feedstock didn't need to mix aromatic raffi-nate.
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