Sulfur injection method for continuous reforming apparatuses

Abstract

The invention discloses a sulfur injection method for a continuous reforming apparatuses. The sulfur injection method comprises: replacing a reaction system loaded with a catalyst by using a hydrogen-containing gas, increasing the temperature to 300-480 DEG C, injecting a sulfide into the pipeline between a reforming mixing feeding heat exchanger and a feeding heating furnace, stopping the sulfur pre-injection when the catalyst in a reforming first reactor contains 100-200 [mu]g / g sulfur or the H2S content in the circulating hydrogen is 2-4*10<-6>L / L, and after feeding in a reforming reaction, continuously injecting sulfur into the feeding pipeline of a continuous reforming apparatus. According to the present invention, with the method, the catalytic caking of the metal can be effectively inhibited, the running risk of the continuous reforming device can be reduced, and the running cycle of the device can be prolonged.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method for combining pre-injection of sulfur at start-up of a continuous reforming unit and continuous sulfur injection after feeding. Background technique [0002] In recent years, continuous reforming (hereinafter referred to as CCR) catalysts and processes have been continuously improved, and the reaction pressure and hydrogen-to-oil molar ratio have decreased; the research octane number (RON) of the reformed oil has been improved. Therefore, the CCR unit’s The severity of the reaction is greatly improved, and the economic benefits of the CCR device are also significantly improved. At the same time, it is worth noting that as the severity of the reaction of the CCR device increases, the tendency of metal-catalyzed coking also increases accordingly. So far, about 10% of continuous reforming units have had metal catalytic coking, which leads to poor flow of c...

AI Technical Summary

Problems solved by technology

①This method adds the procedure of purging the reaction system, which prolongs the start-up time; ②Using hydrogen sulfide as passivation, there are safety hazards in both operation and measurement; ③This method has no pre-passivation sulfur injection speed; ④This method Does not mention whether and how to inject sulfur after reforming reaction after pre-passivation

Because the passivation of the metal wall in the high temperature part of the continuous reforming reaction system is a dynamic process, if the sulfur injection is not appropriate after the reaction feed, metal catalytic coking will also occur

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