Application of hydrocyclone separation technology in MCP device

Abstract

The invention discloses application of hydrocyclone separation technology in an MCP (maximizing catalytic propylene) device. The invention involves a fractionating tower, a stable reboiler, a slurry oil crude oil heat exchanger, and a hydrocyclone separator. The steps include that: slurry oil in the fractionating tower passes through a slurry oil pump to reach high temperature and high pressure, then the slurry oil flows through the stable bottom reboiler and the slurry oil crude oil heat exchanger in order, after cooling to a certain temperature, a part of slurry oil flows back to the fractionating tower through a pipeline, and the other part of slurry oil flows into a liquid inlet of the hydrocyclone separator at certain flow, and then flows into a hydrocyclone head through a clear stream pipe outer wall, and the clear stream pipe outer wall is equipped with a spiral structure, the lower end of the hydrocyclone head is funnel-shaped, after entering the lower end of the hydrocyclone head, the slurry oil undergoes high speed rotating motion, then clear and heavy slurry oil can be separated, the clear stream returns to the upper part of the hydrocyclone separator through the clear stream pipe and flows out, and returns to the fractionating tower, and the heavy stream flows out from the bottom of the hydrocyclone separator and is then thrown out of the device. The invention has the advantages of small slurry oil viscosity, low specific gravity, high solid-liquid separation efficiency, low manufacturing cost and small space occupation.

Description

technical field [0001] The invention relates to the technical field of oil slurry, in particular to the application of a hydrocyclone separation technology on an MCP device. Background technique [0002] MCP (Maximizing Catalytic Propylene, heavy oil selective cracking and multi-production of low-carbon olefins technology) device is a new generation of heavy oil selective cracking and multi-production of low-carbon olefins technology, which can significantly increase the propylene production on the basis of effectively improving the selectivity of heavy oil catalytic cracking reaction rate, completed and put into operation in July 2011. According to the nature of Jiangsu crude oil, the MCP unit adopts the full normal slag feed of North Jiangsu crude oil, and the production plan adopts the method of oil slurry partial back-refining. The oil slurry yield of the equipment is 4.2%. The product quality is stable, the yield of propylene exceeds 15%, and the yield of isobutylene e...

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Problems solved by technology

However, the solid content of the oil slurry in the fractionation system is relatively high. On the one hand, it has an adverse effect on the long-term operation of the device. The solid content of the slurry needs to be increased, which will cause part of the diesel components to be pressed into the bottom of the fractionation tower, and the light oil yield of the device will decrease.

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