催化裂化装置中平衡催化剂微反活性的数学模拟研究

MATHEMATICAL SIMULATION OF MICRO-REACTION ACTIVITY FOR BALANCE CATALYST IN CATALYTIC CRACKING UNIT

通过催化裂化反应动力学及催化剂失活动力学方程推导,确定了裂化催化剂活性与微反活性的数学关系,建立了催化剂水热失活动力学模型方程。依据再生器中催化剂处于全混流状态的性质,建立了工业装置平衡剂微反活性数学模型,通过平衡剂微反活性模拟计算确定了装置因数。研究结果表明:平衡剂微反活性随着催化剂单耗增大先快速提高后缓慢提高;随着再生器温度和水蒸气分压降低、催化剂藏量减少,平衡剂微反活性逐渐提高,为合理确定装置的催化剂置换率奠定了基础。

The mathematical relationship between micro-reaction activity and kinetic activity for catalytic cracking catalyst was determined through the equations derivations of catalytic cracking reaction kinetics and catalyst deactivation kinetics.Based on the flow properties of complete stirred-tank regenerator,the mathematical model of micro-reaction activity for industrial FCCU equilibrium catalysts was developed.The unit factor was calculated through the micro-reaction activity simulation with the mathematical model.The model prediction results showed that the micro-reaction activity of the FCCU equilibrium catalyst increases quickly at first along with catalyst consumption,and then the increase slowed down.In the end,the lower the regenerator＇s temperature,the steam fraction pressure and the catalyst content of regenerator,the higher the micro-reaction activity of FCCU equilibrium catalyst.These laid a foundation for reasonably determining the catalyst replacement rate for FCCU.