The invention discloses a black waste engine oil
vacuum distillation system, which comprises a pretreatment kettle. The oil inlet of the pretreatment kettle communicates with a
mixing tank through a pipeline, and an oil outlet of the pretreatment kettle communicates with a
distillation still through a pipeline. The bottom of the
distillation still is connected to a heating mechanism, and an oil outlet of the
distillation still communicates with a cooling mechanism through a pipeline. An oil outlet of the cooling mechanism communicates with a
gasoline-diesel transit mechanism and a
base oil transit mechanism through pipelines, respectively and is connected to a
gasoline-diesel finished product pot and a
base oil finished product pot, respectively. The distillation still is internally provided with a
thermometer, and the bottom of the distillation still is provided with a deslagging mechanism. The heating mechanism includes a cylindrical
combustion chamber and a
combustion machine which communicates with the cylindrical
combustion chamber. An annular
cold air cavity sleeves the cylindrical
combustion chamber, communicates with one end of the cylindrical
combustion chamber, and externally extends to form a
mixing chamber. An air inlet of the annular
cold air cavity is provided with a frequency-variable blower fan, and an air outlet of the
mixing chamber communicates with the lower end of the distillation still.