250万吨年催化裂化反应—再生系统计算.docVIP

摘 要 催化裂化装置主要由反应—再生系统、分馏系统、吸收稳定系统和能量回收系统构成，其中反应—再生系统是其重要组成部分，是装置的核心。设计中以大庆原油的混合蜡油与减压渣油作为原料，采用汽油方案，对装置处理量为250万吨/年（年开工8000小时）的催化裂化反应—再生系统进行了一系列计算。 根据所用原料掺油量低，混合后残炭值较低，其硫含量和金属含量都较小且由产品分布和回炼比较小，抗金属污染能力强，催化剂的烧焦和流化性能较好及在此催化剂作用下，汽油辛烷值较高这些特点，故采用汽油方案。 设计中，采用了高低并列式且带有外循环管的烧焦罐技术，并对烧焦罐式再生器和提升管反应器进行了工艺计算，其中再生器的烧焦量达32500㎏/h，烧焦罐温度为680℃，稀相管温度为720℃，由于烟气中CO含量为0，则采用高效完全再生。在烧焦罐中，烧焦时间为1.8s，罐中平均密度为100㎏/m3，烧焦效果良好。在提升管反应器设计中，反应温度为505℃，直径为1.62 m，管长为29 m，反应时间为3s，沉降器直径为2 m，催化剂在两器中循环，以减少催化剂的损失，提高气—固的分离效果，在反应器和再生器中分别装有旋风分离器，旋风分离器的料腿上装有翼阀，在提升管和稀相管出口处采用T型快分器。 由设计计算部分可知，所需产品产率基本可以实现。 关键词：催化裂化，反应器，再生器，提升管，烧焦罐，完全再生 Abstract The catalytic cracker constitutes reaction-regeneration system、fraction system、 absorption-stabilization system and power-recovery system. The most important and core part of the unit is reaction-regeneration system. The DaQing Crude wax oil and vacuum distillation residue are taken as feedstock. This paper is a series of processing calculation mainly about reaction-regeneration system. With gasoline scheme, capacity is designed to be 150 Mt/a under the condition of 8000 hours’ operating time. After being mixed the contents of blending residuum, sulphur and metal as well as the carbon residue in feedstock are low. As the even distribution of product, superior properties of resisting metal pollution and the catalyst’s coke burning and fluidization as well as the higher octane number of gasoline with the function of this catalyst, the gasoline scheme are taken. In the design, technology of coke-burning drum with outsider-circulation tube is applied. The drum is of high-low parallel style. The processing calculation is about reproducer of coke-burning drum style and riser, coke-burning capacity is 32500㎏/h, the temperatures of coke-burning drum and dilute phase riser are respectively 680℃and 720℃. Accounting that there is no carbon monoxide in off-gase. The high efficient regeneration is applied. In the coke-burning drum, the scorching time is 1.8s and its average density is 100 ㎏/