Optimization and Application of Catalyst Grading System of Residue Hydrogenation Unit
As the mixed raw materials processed by the residual oil hydrogenation unit tend to become inferior and heavier,and the residual oil components of Saudi heavy oil and Basra medium-low-quality crude oil are blended and processed,higher requirements are put forward for the catalyst gradation scheme.In order to meet the actual production needs of the enterprise's device requirements for hydrogenation residue metal mass fraction ≯ 12.0 µg·g-1,based on the catalyst gradation plan of the third cycle,the catalyst gradation plan of the fourth cycle was adjusted and optimized.The gradation ratios of catalysts and desulfurization and demetallization transition catalysts were increased by 2.30 percentage points,3.84 percentage points,and 6.66 percentage points respectively.When the properties of the mixed raw materials in the fourth cycle and the third cycle were similar,the metal(Ni,V)removal rate in the fourth cycle was increased by 2.62 percentage points compared with the third cycle,reaching 87.07%,which met the actual production needs of the company.
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