强化烧焦组合技术在催化裂化装置改造中的应用

Application of intensified coke-burning technology in FCCU revamping project

中国石油大连石化公司1.4Mt/a催化裂化装置运行中存在高温取热炉管多次发生爆管、催化剂粉尘集聚且难以清除等问题,严重影响装置满负荷安全运行。采用多项强化烧焦、催化剂流化、输送和取热技术对该装置进行改造,第一、二再生器均为完全再生,取消了高温取热炉。结果表明：1高温取热炉爆管、烟气中CO含量高及第一再生器到第二再生器空气提升管容易噎塞等问题彻底消除;2实现了催化剂的低温高效再生,再生烟气中CO质量浓度为0~150mg/m3,NOx质量浓度为100~180mg/m3,反应剂油比和重油转化条件得到有效改善,原料残炭在6.0%和6.4%时,总液收率均有1百分点左右的增幅。本次装置改造基本保留原反-再系统主体设备和框架,投资相对节省,改造后装置在平稳运行、安全环保和产品收率方面均有显著提升。

The catalyst cooler tubes of the 1.4 MM TPY RFCC unit in PetroChina Dalian Petrochemical Company ruptured many times and the catalyst particles depositions were difficult to be removed, which have seriously affected the safe operation of the unit at full capacity. The unit was revamped with intensified coke- burning process, catalyst fluidization and transfer process and catalyst cooler process for heat removal, etc. After revamping, the full regeneration of 1st-stage and 2nd-stage regenerator was realized, and high-tempera- ture heat removal furnace was removed. The results showed 1 ） that the problems of rupture of high-tempera- ture heat removal furnace tubes, high CO in flue gas and the plugging of air riser from 1st-stage reactor to 2nd- stage reactor were solved ; 2） The low-temperature high-efficiency regeneration of catalyst were realized, CO in regenerator flue gas was 0 ~ 150 mg/m3 and NOx was 100 ~ 180 mg/m3 , the catalyst to oil ratio in the reactor and heavy oil reaction conditions were effectively improved, and the total liquid yield was increased by about 1% at the 6.0% and 6.4% carbon residue of feedstock. The main equipment and supports in the reactor and regenerator system were substantially maintained, which has saved investment. The unit has been running stably after revamping, and the safety, environmental protection and product yields have been improved.