Circulating CO shift process of saturation tower

Abstract

The invention relates to a circulating CO shift process of a saturation tower. The circulating CO shift process comprises the following steps that a coarse synthetic gas from a pulverized coal gasification unit is divided into two branches, the first branch of coarse synthetic gas is moisturized and heated in the saturation tower and then mixed with high pressure steam and a first branch of primary shift gas and replenished with medium-pressure boiler water, and then the obtained mixture is fed into a No.1 shift furnace for shift reaction, the obtained primary shift gas is divided into two branches after heat exchange, the second branch of primary shift gas is mixed with the first branch of coarse synthetic gas to obtain a primary shift mixed gas, the primary shift mixed gas is mixed and replenished with medium-pressure steam and then fed into a No.2 shift furnace for continuous shift reaction, and the secondary shift gas is fed into a No.3 shift furnace for reaction after heat exchange. The operation of dividing the coarse synthetic gas and the primary shift gas into branches in the circulating CO shift process, so that the CO concentration entering the shift furnaces is effectively reduced; the operating temperatures of the shift furnaces are low, and the operating environment of a catalyst is mild, so that the service life of the catalyst and the operation period of the device are prolonged; and meanwhile, the amount of steam used is reduced, and the effects of energy conservation and consumption reduction are remarkable.

Description

technical field [0001] The invention relates to a CO conversion process, in particular to a saturated tower circulation CO conversion process. Background technique [0002] In recent years, my country's coal gasification technology has made great progress, especially the pulverized coal pressurized gasification technology using waste heat boiler process, which has the characteristics of low coal quality requirements, high effective components in syngas, low operating costs and environmental friendliness. It is adopted by more and more large coal chemical plants in China. The crude synthesis gas produced by pulverized coal pressurized gasification technology in the waste heat boiler process usually has a CO dry basis volume content of more than 60% and a water vapor volume content of less than 20%. The crude synthesis gas has a significant low water vapor content and a high CO content. features. [0003] When the pulverized coal pressurized gasification technology in the was...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a saturated tower circulating CO shift process in view of the current state of the art, so as to solve a series of problems such as easy overheating of the shift furnace in the existing high water-gas ratio CO shift process, short catalyst life, and high energy consumption. technical problem

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