重馏分油流化催化裂化使用一个ＦＣＣ反应器 ,该反应器包括一个下流式的反应段、一个再生段、一个催化剂汽提段 ,一个催化剂再生段和一个分馏段。该工艺包括 :①将重馏分油和未精制油引入反应段入口 ;②从再生段取出的部分再生催化剂送入催化剂反应段入口 ,使油与催化剂接触 ; Heavy-fluid fluid catalytic cracking uses an FCC reactor comprising a downflow reaction zone, a regeneration zone, a catalyst stripping zone, a catalyst regeneration zone, and a fractionation zone. The process comprises: (1) introducing heavy distillate and unrefined oil into the inlet of the reaction section; (2) feeding part of the regenerated catalyst withdrawn from the regeneration section into the inlet of the catalyst reaction section to make the oil contact with the catalyst;