静电分离催化裂化油浆中固体颗粒及其组成的研究

摘要

采用自制的静电分离装置，对某重油催化裂化装置外甩的催化裂化油浆（FCCS）进行静电分离实验。考察分离时间、温度、填料粒径、电场强度及分离级数对静电脱除效率的影响，并采用SEM，EDS，XRD等方法对固体颗粒进行表征。实验结果表明，静电脱除效率，随静电分离时间的延长先增大后趋于稳定，随温度的升高而增大，随填料粒径的减小而增大，随电场强度的增加先增大后有所降低；适宜的分离条件为：分离时间25～30 min、温度140～160℃、填料粒径2.0～2.5 mm、电场强度3.5 kV/cm，在此条件下经三级静电分离可使静电脱除效率最高达到99%，FCCS中的固体颗粒含量由4200 mg/L降至50 mg/L以下；FCCS中的固体颗粒主要由催化剂细粉、焦粉和金属锑组成。%The electrostatic separation of fluid catalytic cracking slurry(FCCS) from a heavy oil catalytic cracking unit was carried out in a self-made experimental installation. The influences of processing time,temperature,packing diameter,separation stages and electric field intensity on the electrostatic removal efficiency were investigated. The solid particles in FCCS were characterized by means of SEM,EDS and XRD. The experimental results showed that,the electrostatic removal efficiency firstly increased and then stabilized with prolonging the processing time,increased with the temperature rise,increased with the decrease of the packing diameter,and increased and then decreased with the increase of the electric field intensity. Under the appropriate conditions of processing time 25-30 min,temperature 140-160℃,packing diameter 2.0-2.5 mm and electric field intensity 3.5 kV/cm,through three-stage of electrostatic separation,the electrostatic removal efficiency reached 99% and the content of the solid particles in FCCS lowered from 4 200 mg/L to less than 50 mg/L. The solid particles in FCCS consisted of catalyst powder,coke powder and antimony mainly.