Residual oil visbreaking device and method

Abstract

The invention relates to a residual oil visbreaking device and method. A structure of the residual oil visbreaking device is as follows: a residual oil inlet is formed on a residual oil visbreaking tower; the upper part of the residual oil visbreaking tower is provided with a visbroken residual oil outlet; a pipeline is led out from the visbroken residual oil outlet to be connected into the lower part of a distillation tower; a pump is connected to the pipeline; and the upper part of the distillation tower is provided with a fraction outlet while the lower part of the distillation tower is provided with a visbroken residual oil draining opening. The residual oil visbreaking method comprises the steps of adding hot residual oil of about 405 DEG C to the residual oil visbreaking tower from the residual oil inlet; carrying out visbreaking reaction for 120 minutes under a heating condition; adding the visbroken residual oil to the distillation tower to be distilled at about 385 DEG C; and collecting the separated light fraction via the fraction outlet, wherein the rest product in the distillation tower is a visbroken residual oil finished product. By using the device and method provided by the invention, the loss of the thermal energy can be reduced in the residual oil visbreaking process, the working hour consumption can be reduced and the efficiency is improved. The device and method provided by the invention are suitable for being used in the production of obtaining the light fraction while the residual oil is visbroken in the petroleum refining field.

Description

technical field [0001] The invention relates to a residue oil visbreaking device and a residue oil visbreaking method in the field of petroleum product processing. Background technique [0002] The distillation unit is the "leading" unit for processing crude oil in various petrochemical enterprises. The energy consumption of the unit is relatively high, and it is the key monitoring device for energy-saving optimization of petrochemical enterprises. Oil viscosity, on the one hand, can realize the viscosity-reducing residual oil without adding or adding less diesel oil, so that it can be directly shipped as heavy fuel oil. On the other hand, after the vacuum residue after visbreaking enters the coking unit, the light oil yield of the unit can be increased by 2.3 percentage points, and the coke yield can be reduced by 3.36 percentage points. [0003] At present, most of the existing visbreaking units in China are built independently. After the visbreaking residue is cooled, it...

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Problems solved by technology

[0003] At present, most of the existing domestic visbreaking units are built independently. After the visbreaking residue is cooled, it is sent from the distillation unit to the visbreaking unit and then heated up. The heat loss is serious, resulting in high energy consumption for both units.

[0004] At present, the existing visbreaking devices in China generally adopt the process of entering the fractionation tower after heat exchange or injecting quenching oil into the fractionation tower to prevent the thermal residue from coking in the tower. If this process is adopted, although the technology is mature, the fractionation tower bottom residue The temperature of the oil entering the distillation unit will be about 340°C, and the modification loses the effect of optimizing the distillation heat exchange process

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