Method for prolonging operation cycle of coker gasoline hydrogenation unit

Abstract

The invention relates to a method for prolonging the operation cycle of a coker gasoline hydrogenation unit; and the method is as follows: (1) before coker gasoline enters into a coker gasoline hydrogenation reactor from a coking device, the coker gasoline first enters into a dehydration buffer tank sealed by nitrogen, water carried in the raw material is removed, the nitrogen sealing pressure is controlled in 0.7MPa; the dwell time is controlled in 4-8 hours; (2) and then the coker gasoline first enters into an automatic backwash filter, the filtration precision control is controlled in 15 to 20 mu m; (3) before the coker gasoline enters into a hydrogen mixing raw material for hydrogen mixing with a refined product heat exchanger, a polymerization resistant dispersant is injected, so that before the coker gasoline enters into the reactor, olefin polymerization reaction does not occur or occurs in a small amount; the agent injection ratio is controlled in 40ppm-50ppm; the method can effectively reduce the rise velocity of reactor bed pressure drop and reaction system pressure drop, and can effectively prolong the operation cycle of the unit.

Description

technical field [0001] The invention relates to a method for prolonging the operation cycle of a coker gasoline hydrogenation unit. Background technique [0002] The feeding method of the coking gasoline hydrogenation unit is that the coking gasoline produced by the coking unit enters the oil product tank area, and then is pumped from the oil product tank area through the raw material pump into the device, and enters the high-pressure feed pump through the ceramic filter element filter, and is mixed after boosting. The hydrogen enters the heating furnace through the heat exchanger of the hydrogen-mixed raw material and the reaction product, and enters the reactor after being heated to the predetermined reaction temperature through the heating furnace. [0003] There is a problem: [0004] 1. The content of olefins and dienes in coking gasoline is very high, and some olefins and dienes are active, and they will undergo polymerization reaction to form macromolecules at room t...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for prolonging the operating period of coker gasoline hydrogenation unit; to solve the problem of small molecule polymerization of coker gasoline during storage at room temperature, reduce the impact of macromolecular polymers on the pressure drop of the device, and prolong the operation of the device cycle; reduce the coking and carbon deposition of raw materials in the heat exchanger, slow down the growth rate of the pressure drop of the reaction system, and reduce the coking of the heat exchanger into the reactor and accumulate in the upper bed of the reactor, reducing the upper bed of the reactor The growth rate of the pressure drop can reduce the shutdown process caused by the increase of the pressure drop of the bed layer, thereby prolonging the operation period of the device

Images