The invention discloses an on-line vacuum gasification
system which comprises an oil liquid heater, a vacuum separating device, filters, condensers, roots pumps and a
vacuum pump, wherein the vacuum separation device comprises a vacuum tank, an atomizer and a reaction rack; the filters comprises a primary filter, a secondary filter and a fine filter; an oil inlet pump, the primary filter, the oil liquid heater, the
vacuum pump, an oil outlet pump, the secondary filter and the fine filter are sequentially connected; the atomizer comprises an oil inlet tube, a
distributor and a
nozzle; gas inlets of the condensers are communicated with a chamber between the atomizer and the reaction rack; gas outlets of the condensers are connected with the gas inlets of the roots pumps; the gas outlets of the roots pumps are connected with the gas inlet of the condenser III; the gas outlet of the condenser III is connected with the
vacuum pump. An oil liquid firstly passes through the primary filter and is subsequently gasified in vacuum, and is finally filtered through the secondary filter and the fine filter, the
filtration effect is good, condensation for water removal and
drying treatment are performed through high-temperature vapor, and the service life of the vacuum pump is greatly prolonged.