Study On The 13-lump Kinetic Model For Residue Fluid Catalytic Cracking

Based on the composition of heavy oil and characteristics of product distribution in the residue fluid catalytic cracking(RFCC)process,its reaction system was divided into 13 lumps,including HS(saturates),HA(aromatic),HR(resin&asphaltene),DIESEL(diesel oil),GS(gasoline saturates),GO(gasoline olefin),GA(gasoline aromatics),DGAS(dry gas),L03(propylene),L04(butene),LPGD(liquefied gas),IC4(iso-butane)and COKE(coke).Based on the FCC reaction mechanism and process characteristics,a 13-lump reaction network(including 61 reactions)was established.Through the reasonable simplification and assumption for reactor,with reference to previous modeling experience,the lump kinetic model equation was deduced.Then,Runge-Kutta method was used to calculate differential equations,BFGS algorithm was adopted in optimization of objective function.61 sets of pre-exponential factors and activation energy parameters and 3 catalyst deactivation constants were calculated with experimental data from DCR unit,which show good consistence with the reaction rules of FCC.As a result,the model has good reliability.Then,the effects of single operating condition and double operation conditions on the product distribution were investigated,and the prediction results were in good agreement with the reaction rules of FCC.The optimal operation conditions for main products can be also determined by the model.In general,the model shows good reliability and can provide guidance for RFCC process optimization.