Abstract: Using dynamic simulation software, the phenomenon of over temperature duringfeeding low-pressure gas into CO shift system with high water/gas ratio for hydrogen production from coal water slurry is studied, and several common temperature control measures, including adding high-pressure steam and high-pressure boiler water, increasing the flow rate of raw syngas, and cutting off the feed and purging are analyzed. The phenomenon of over temperature duringfeeding low-pressure gas is visually displayed in theory,and the relationship between process parameters such as valve opening, flow rate of raw syngas, temperature of shift gas, degree of methanation reaction, system pressure and gas flowrate and time is also shown.Combining with practical operation experience, the applicability and suggestions of temperature control measures are given.

Key words: shift reaction, over- temperature, dynamic simulation, cooling controlling methods, coal-water slurry