The invention discloses a heavy
hydrocarbon hydrogenation combined process which comprises: (a) heavy
hydrocarbon raw material and a gas-phase outflow substance from the
fixed bed hydrogenation reaction are mixed and enter a boiling
bed hydrogenation reactor; (b) the gas-phase outflow substance from the boiling
bed hydrogenation reaction in the step (a) is subjected to
hydrogen sulfide removal and then used for the
fixed bed hydrogenation reaction of the gas-phase outflow substance of the boiling
bed hydrogenation reaction in the step (a); and (c) the gas-phase outflow substance of the
fixed bed hydrogenation reaction in the step (b) is directly used for the boiling bed hydrogenation reaction process in the step (a), and the liquid-phase outflow substance of the fixed bed hydrogenation reaction in the step (b) is fractionated to obtain a
gasoline fraction, a diesel fraction and unconverted
tail oil. In the combined process, the boiling bed technique and the fixed bed technique are combined by fully considering the technical characteristics of the boiling bed and the fixed bed as well as the features of the reaction materials, thereby providing a new
operation mode which is flexible, efficient and energy-saving; and on the premise of ensuring the smooth operation of the device, the reaction heat is fully utilized, high product quality is provided, and the operational process can be flexibly adjusted according to the requirements of refineries.