The invention discloses a
crude oil reduced pressure
distillation method for eliminating a
choke point in a
pressure reduction process. The method comprises the following steps: firstly, performing heat exchange on
atmospheric pressure residual oil through an
atmospheric pressure furnace
convection section and a reduced pressure furnace
convection section, raising the temperature by 5-20 DEG C, then feeding the
residual oil into a reduced pressure flash column, operating the reduced pressure flash column at 5-30kPa, at the same time, introducing reduced pressure flash column light lube oil as washing oil from the upper part of a reduced pressure
distillation column, performing heat exchange on a gas on the top of the reduced pressure flash column, condensing, cooling and directly extracting the gas as a product, extracting the washing oil in the middle of the reduced pressure flash column, feeding the washing oil below a light lube oil extracting plate of the reduced pressure flash column, feeding the flash
base oil of the reduced pressure flash column into a reduced pressure furnace, heating to be 370-410 DEG C, feeding into the reduced pressure
distillation column through an oil
transfer line, performing reduced pressure
fractionation, and then extracting products of different fractions from a side line of the reduced pressure distillation column. The method improves the
crude oil reduced pressure distillation process, eliminates the
choke points of the reduced pressure furnace and the reduced pressure distillation column, reduces
energy consumption, improves the treatment capacity and increases the
economic benefits of a device.