催化剂磨损和再生器催化剂跑损的控制

CAUSES AND CURES FOR CATALYST ABRASION AND LOSS IN FCC REGENERATOR

中国石油化工股份有限公司荆门分公司的流化催化裂化装置自 1999年以来催化剂耗量增加的主要原因是催化剂磨损严重 ,催化剂细粉含量增加。催化剂磨损严重的主要原因是在催化剂流过的一些部位 ,如原料喷嘴、提升管出口分布板和油浆喷嘴等处的催化剂线速过高。针对这种情况采取了一些措施 ,如严格控制原料雾化蒸汽量和预热温度 ,清除提升管出口分布板和油浆喷嘴处的结焦 ,控制油浆回炼量等。采取措施后 ,小于 2 0 μm催化剂细粉含量由 4%～ 5 %降到 0 .2 %～ 0 .6% ,2 0～ 40 μm细粉含量由 2 5 %～ 2 7%降低到 18%～ 19% ,催化剂单耗由 1.2kg/t降到 0 .6～ 0 .7kg/t。

The increasing loss of catalyst in FCCU of Jingmen Company,China Petrochemical Corporation,since 1999,resulted from the increasing content of fine catalyst due to heavy catalyst abrasion,which was caused by much higher linear velocity of the catalyst at the spraying nozzle of feedstock,the outlet distributor of the riser and the spraying nozzle of slurry. Measures such as controlling the amount of steam for feedstock atomizing and pre heating temperature,removing coking at the outlet distributor of the riser and at slurry spraying nozzle ,controlling the amount of recycled slurry ,have been taken.After a running period,the content of fine particles less than 20 μm reduced from 4%～5% to 0.2%～0.6%, while that of 20～40 μm's from 25%～27% down to 18%～19%.The specific consumption of catalyst reduced from 1.2 kg/t to 0.6～0.7 kg/t.