A method for controlling the bottom liquid level and reaction severity of fractionation tower

Abstract

A method for controlling bottom liquid level and reaction severity of a fractionating column is characterized in that a collapsing plate of the fractionating column is positioned at the lower portion of the fractionating column, catalytic cracking raw oil medium that is subjected to heat exchange is introduced to a position on the sidewall of the fractionating column, near the collapsing plate vertical height, wherein a mass ratio of the catalytic cracking raw oil medium to the catalytic cracking reaction product of the fractionating column to 1:1000 to 0.5:1; the position on the sidewall of the fractionating column near the collapsing plate vertical height is on the sidewall of the fractionating column between the collapsing plate and a catalytic cracking reaction product inlet, or on the sidewall of the fractionating column between the collapsing plate and a recycle oil outlet. By using the method, the bottom liquid level and reaction severity of a fractionating column can be controlled, catalytic cracking coke yield is decreased effectively, and continuous production of equipment is achieved.

Description

technical field [0001] The present invention relates to a control method in catalytic cracking process. Background technique [0002] Catalytic cracking is one of the most important heavy oil lightening processes. The catalytic cracking process has low investment, low operating costs, strong adaptability of raw materials, high yield of light products, and mature technology. It is the main source of refinery profits at present (Zuo Lihua. Development status and prospects of catalytic cracking technology in my country[J]. Petroleum Chemical Technology Economics, 2000, 16(1): 16-21.). At present, the annual processing capacity of catalytic cracking in my country has exceeded 100 million tons. In the composition of commercial gasoline, catalytic cracking gasoline accounts for about 80%, diesel oil accounts for about 30%, and more than 30% of propylene comes from catalytic cracking process. [0003] Fractionation tower is one of the important processes of catalytic cracking unit...

AI Technical Summary

Problems solved by technology

However, most of these technologies do not introduce foreign raw materials to control the coking at the bottom of the fractionating tower by controlling the liquid level at the bottom of the fractionating tower, which cannot fundamentally solve the density and solid content of the oil slurry at the bottom of the fractionating tower.

[0006] To sum up, when the liquid level of the oil slurry at the bottom of the fractionating tower rises, it can be adjusted by increasing the reaction severity and increasing the amount of external rejection, but it will increase the solid content and density of the oil slurry at the bottom of the fractionating tower, increasing the The risk of coking at the bottom of the fractionation tower; when the liquid level of the oil slurry at the bottom of the fractionation tower decreases, it can be adjusted by reducing the severity of the reaction, reducing the amount of external rejection, etc., but it will inevitably reduce the yield of the target product, thereby reducing the economic efficiency of the device. benefit

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