Catalytic cracking fractionating tower oil slurry circulating heating system

Abstract

The invention discloses a catalytic cracking fractionating tower oil slurry circulating heat removal system, and belongs to the technical field of petroleum processing. The technical scheme is as follows: the system comprises a fractionating column, an oil slurry outlet at the bottom of the fractionating column is connected with an oil slurry discharge pipe; an oil slurry pump is arranged on the oil slurry discharging pipe; an outlet of the oil slurry discharging pipe is connected with a feeding hole of the first heat exchanger; a discharge port of the first heat exchanger is respectively connected with an upper return column oil slurry pipe, a lower return column oil slurry pipe and an FCC slurry oil pipe, an outlet of the upper return column oil slurry pipe is connected with an upper return column oil slurry port of the fractionating column, an outlet of the lower return tower oil slurry pipe is connected with a lower return column oil slurry port of the fractionating column, and anoutlet of the FCC slurry oil pipe is connected with the tank area; a recycle oil outlet of the fractionating column is connected with a recycle oil discharge pipe, a recycle oil pump is arranged on the recycle oil discharge pipe, and an outlet of the recycle oil discharge pipe is connected with a feed port of the second heat exchanger. According to the invention, the coking problem caused by overhigh fractionating column bottom temperature is solved, the oil slurry quality is improved, and the long-period operation of the system is ensured.

Description

technical field [0001] The invention relates to the technical field of petroleum processing, in particular to an oil slurry circulation heat extraction system of a catalytic cracking fractionation tower. Background technique [0002] In the catalytic cracking fractionation tower oil slurry circulation system, part of the oil slurry from the bottom of the fractionation tower will return to the bottom of the fractionation tower as a stirring oil slurry to stir the oil slurry at the bottom of the fractionation tower to prevent the oil slurry from settling at the bottom of the tower If the time is too long, it will cause coking at the bottom of the tower. However, there is still the problem that the temperature at the bottom of the fractionation tower is as high as 365°C, which leads to coking of the oil slurry, resulting in poor quality of the oil slurry, which is not conducive to the long-term operation of the system. Contents of the invention [0003] The technical problem...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a catalytic cracking fractionation tower oil slurry circulation heat extraction system, to solve the problem of oil slurry coking caused by too high temperature at the bottom of the fractionation tower, and to improve the efficiency of the oil slurry quality, to ensure the long-term operation of the system

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