DCC装置脱丙烷塔塔底重沸器结焦原因及对策

COKING REASON OF BOTTOM REBOILER OF DEPROPANIZER IN DCC UNIT AND COUNTERMEASURES

针对某公司催化裂解(DCC-plus)装置气体分离单元脱丙烷塔塔底重沸器结焦,严重影响装置长周期运行的难题,综合分析指出催化裂解液化气丁二烯含量偏高,重沸器热源温度高、携带碱液及含氧气等杂质是产生丁二烯结焦、结垢的主要原因,提出了可以采取优化分离流程、改变重沸器热源、减少氧气等杂质带入、加强系统脱水、设备除锈钝化、加注阻聚剂等措施,大大减缓结焦、结垢速率,保证装置长周期运行。

The coking of butadiene in the bottom reboiler of depropanizer in a deep catalytic cracking(DCC-plus)unit of a company seriously affects the long-term operation of the unit.The comprehensive analysis shows that the high content of butadiene in LPG,the high reboiler heat source temperature,and the high content impurities such as oxygen and alkaline matter will cause coking and fouling.By means of optimizing the separation process,transforming reboiler heat source,reducing impurities such as oxygen,strengthening system equipment passivation and filling inhibitor,the coking and scaling rates can be greatly reduced,which can ensure the long period operation of the unit.