高铁钙原料渣油加氢装置长周期运行的工业实践

中国石化长岭分公司1.7Mt/a固定床渣油加氢装置加工的原料油铁、钙含量较高。通过在电脱盐装置增设注入脱钙剂的设施以及调整渣油加氢装置第一反应器(一反)催化剂级配方案,实现了加工高铁、钙含量渣油的固定床渣油加氢装置的首次长周期运转。从该装置第一周期的运转情况来看,导致渣油加氢装置停工的最直接因素为一反压降升高至上限值0.7 MPa。从运行数据和旧剂的分析结果可以看出,铁、钙的沉积以及积炭是引起一反压降上升的主要因素。

INDUSTRIAL PRACTICE OF LONG-TERM RUNNING OF HYDROPROCESSING RESIDUE WITH HIGH Fe AND Ca CONTENT

Residue with high Fe and Ca content were hydroprocessed in a 1.7 Mt/a VRDS unit of SINOPEC Changling Branch Co., The long-term cycle operation processing high Fe and Ca content residue was achieved in the second cycle operation through setting a new device in the electric desalting unit for injecting decalcification agent and adjusting the layered catalyst beds in the 1st reactor of VRDS unit. It is seen that the higher pressure drop (above the threshold value of 0.7 MPa) is the key point to the shutdown of the unit in the first cycle. The analysis of the operation data and the spent catalysts indicates that the reasons for excessive pressure drop of the 1st reactor in the first cycle are Fe and Ca depositions as well as coke formation.