The invention discloses a combined process for preparing
fuel oil by hydro-
cracking and hydro-upgrading of
coal tar, and belongs to the field of
coal chemical industries. The
coal tar is fractionated through a fractionating
tower, then heavy component oil whose
boiling point is larger than 360 DEG C and light component oil whose
boiling point is lower than 360 DEG C are obtained, the heavy component oil is subjected to a
cracking reaction under a
hydrogen condition, generated oil formed in the
cracking reaction goes back to the fractionating
tower, the light component oil whose
boiling point is lower than 360 DEG C is subjected to hydro-refining and hydro-cracking systems, so that
gasoline and diesel blended components of high quality can be obtained. According to the invention,
coke generated is obviously reduced,
polymerization and condensation of unsaturated hydrocarbons such as olefin, aromatic hydrocarbons and the like are inhibited, the incidence of coking is reduced, the yield of liquid products obtained through a delayed coking process is improved, working periods of devices are prolonged, and equipment investment is reduced. According to the invention, products of high quality can be produced, and the
utilization rate of the
coal tar is improved, thereby bringing substantial
economic benefits and facilitating environment protection.