Hydrogenation method and hydrogenation system for hydrocarbon oil

A hydrogenation method for a hydrocarbon oil, is characterized in that the method comprises the following steps:

• (1) subjecting a hydrocarbon oil raw material to a first hydrocracking reaction in the presence of hydrogen, so as to obtain a first hydrocracking reaction product, wherein the mass content of a C7+ n-alkane in the first hydrocracking reaction product is 5% or below;
• (2) subjecting the first hydrocracking reaction product to a second hydrocracking reaction in the presence of hydrogen, so as to obtain a second hydrocracking reaction product;
• (3) separating and fractionating the second hydrocracking reaction product.

A hydrogenation system for a hydrocarbon oil, is characterized in that the system comprises a first hydrocracking catalyst bed, a second hydrocracking catalyst bed, a gas-liquid separation unit, and a fractionation unit arranged in sequence along the direction of material flow;

• wherein the first hydrocracking catalyst bed is loaded with a first hydrocracking catalyst, and the second hydrocracking catalyst bed is loaded with a second hydrocracking catalyst;
• the first hydrocracking catalyst includes a molecular sieve capable of selectively cracking n-alkane.