Low-pressure filtering system of hydrogenation device

The utility model relates to the technical field of impurity removal of hydrogenation devices, and particularly discloses a low-pressure filtering system of a hydrogenation device, which comprises a feeding pipeline communicated with a material backwashing system and used for introducing coal tar, and a low-pressure filtering system communicated with the feeding pipeline and used for reducing the cleaning frequency of a high-pressure filtering system, a discharging pipeline is communicated between the low-pressure filtering system and the raw material buffer tank, the low-pressure filtering system comprises a first material passing pipeline communicated with the feeding pipeline, a first low-pressure filtering mechanism communicated with the first material passing pipeline and a second material passing pipe communicated with the first low-pressure filtering mechanism, and the second material passing pipe is communicated with the discharging pipeline; according to the scheme, the problem that solid impurities