Process for online increase of chill pipeline to refined-desulfurization pre-hydrogenation catalyst

Abstract

The invention discloses a process for online increase of a chill pipeline to a refined-desulfurization pre-hydrogenation catalyst. The process comprises a heater, a hydrogenation pre-convertor, a primary hydrogenation convertor, a primary zinc oxide desulfurizer, a secondary hydrogenation convertor, a secondary zinc oxide desulfurizer and a chill header pipe, wherein the heater, the hydrogenationpre-convertor, the primary hydrogenation convertor, the primary zinc oxide desulfurizer, the secondary hydrogenation convertor and the secondary zinc oxide desulfurizer are arranged sequentially, andthe chill header pipe is used for conveying chill coal gas; and a plurality of branch pipes are arranged on the chill header pipe, and the other end of each branch pipe is separately introduced to a trough inlet of the hydrogenation pre-convertor, a trough inlet of the primary hydrogenation convertor and a trough inlet of the secondary hydrogenation convertor so as to control a temperature of a bed layer. According to the process, through increasing a coal gas chill header pipe at the trough inlets of the hydrogenation convertors, the catalyst bed layer is liable to overtemperature during curing or new trough pouring of a replaced raw catalyst, added chill coal gas is used for cooling the catalyst bed layer when the temperature of the bed layer rises too fast, so that the problem of shutdown curing is avoided, online curing is achieved, the production output of LNG (Liquefied Natural Gas) is not affected, and production loss is reduced.

Description

technical field [0001] The invention relates to a chemical technology, in particular to a process for adding a cold shock pipeline on-line to a fine desulfurization prehydrogenation catalyst. Background technique [0002] Coke oven gas, also known as coke oven gas, is a flammable gas produced while producing coke and tar products. It is a by-product of the coking industry. If coke oven gas is directly discharged into the atmosphere, it will not only waste energy , and cause great pollution to the environment. Due to the complex composition of coke oven gas and high sulfide content, which affects the normal production and operation of production, coke oven gas needs to be finely desulfurized before being used. [0003] In the process of coke oven gas treatment, it is necessary to carry out hydrogenation catalyst treatment and desulfurization treatment. Practice has proved that when the first-stage pre-hydrogenation catalyst is in the tank, because the new catalyst is left fo...

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Problems solved by technology

[0003] In the process of coke oven gas treatment, it is necessary to carry out hydrogenation catalyst treatment and desulfurization treatment. Practice has proved that when the first-stage pre-hydrogenation catalyst is in the tank, because the new catalyst is left for too long after sulfidation is completed, the coke will be re-passed. When the furnace gas is used, the bed temperature is prone to overheating. Although when the gas is fed at low temperature and with a small flow rate, the new tank can be slowly incorporated into the system, but the time required is too long and the amount of venting is large, which will affect the output of LNG. Big

At the same time, when the new catalyst replaced in the existing design is vulcanized, it must be stopped for vulcanization, which will also affect production

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