Control Scheme Discussion for Bottom Oil Slurry System of FCCU Fractionator

流化催化裂化装置（FCCU）分馏塔底油浆系统的控制效果对整个装置的平稳安全运行具有重要意义。近年来国内新建了许多大型FCCU，既包含国内各设计院自己的技术，也有部分引进国外的工艺包，其分馏塔底油浆系统的控制方案也有多种形式。总结了近年来国内新建FCCU常用的三种较为典型的油浆系统控制方案，阐述了各方案的特点，对其进行了简要的对比和分析。在此基础上尝试性地提出了这三种方案的适用场合，方便设计人员根据每个项目的特点设计合理的控制方案，达到最佳控制效果。

The control effect of bottom oil slurry system of fractionator in the fluid catalytic cracking unit （FCCU） is of great significance for the FCCU＇s smooth and safe operation. Many large FCCUs have been constructed in China in recent years. Some adopt domestic technologies and others adopt foreign technology packages with varies types of control scheme for bottom slurry oil system of these FCCU fractionators. Three typical control schemes are summarized. In recent years, they have been applied in the bottom slurry oil system of fractionator on new domestic FCCU. The properties are described, briefly compared and evaluated for each individual control scheme. On this basis, their applicable situations have been put forward for designer to design reasonable control scheme for each individual project based on characteristics to reach best control effect.