Catalytic cracking equipment generally consists of four major parts: reaction-regeneration system, fractionation system, absorption stabilization system and flue gas energy recovery system. Among them, the task of the reaction-regeneration system is to carry out the reaction conversion of raw materials and the coking regeneration process of the catalyst; the fractionation system is to separate the reaction products to obtain rich gas, crude gasoline, light diesel oil, heavy diesel oil, back refining and oil slurry; catalytic cracking unit The function of the absorption stabilization system is to further separate the rich gas and crude gasoline by means of absorption and rectification to obtain dry gas, liquefied gas and stable gasoline; the task of the flue gas energy recovery system is to recover the kinetic energy, pressure energy and chemical energy of the regenerated flue gas. can.