A CO-shift process that can prolong the service life of catalysts

Abstract

The invention relates to a CO conversion process capable of prolonging the service life of catalysts. The CO conversion process capable of prolonging the service life of catalysts is characterized by comprising the following steps: crude synthesis gas is divided into two strands; initially, the flow ratio of a first stand of the crude synthesis gas and a second strand of the crude synthesis gas is 3:7; a first raw gas is blown into a first conversion furnace for conversion reaction; the water-air ratio is controlled to be 1.7-1.8; the temperature is 250-270 DEC G; the second strand of the raw gas is mixed with a variable gas mixture and blown into a second conversion furnace; when the dry basis CO concentration in a variable gas mixture at the exit of the first conversion furnace is equal to or larger than 6v %, the distribution ratio of the first strand of raw gas and the second strand of raw gas is changed into 1:1; the vapor quantity supplemented to the first strand of raw gas is not changed; the water-air ratio entering the first conversion furnace is changed into 1.45-1.65; when the dry basis CO concentration in a variable gas mixture at the exit of the first conversion furnace is equal to or larger than 7.5 v %, the distribution ratio of the first strand of raw gas and the second strand of raw gas is changed into 7:3; the vapor quantity supplemented to the first strand of raw gas is not changed; the water-air ratio of the crude synthesis gas entering the first conversion furnace is changed into 1.15-1.25. The CO conversion process provided by the invention can effectively control reaction over temperature, therefore, the service life of the catalysts is prolonged.

Description

technical field [0001] The invention relates to a chemical process, in particular to a CO conversion process capable of prolonging the service life of a catalyst. Background technique [0002] The carbon monoxide shift is the main supporting device of the coal gasification process. The CO shift reaction is carried out in the shift furnace, which is filled with shift catalysts. [0003] The conversion of coal gasification supporting uses a sulfur-resistant shift catalyst, which is suitable for wide temperature (200 ℃ ~ 500 ℃), wide sulfur (process gas sulfur content ≥ 0.01% (v / v)) and wide water-gas ratio (0.2 ~2.0) features. There are two main factors affecting the service life of the catalyst, one is the reaction overtemperature, and the other is the water-gas ratio. [0004] CO shift is a strongly exothermic reaction, and the temperature rise is higher after the shift reaction. Water vapor is an indispensable medium in the shift reaction and plays a very important role ...

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Problems solved by technology

Therefore, too high water-air ratio is very unfavorable to shift catalyst, which will reduce the service life of catalyst

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