Experimental study on additives inhibiting ammonia escape in carbon capture process using ammonia method

Abstract

Carbon capture using ammonia solution is facing a big problem due to the ammonia escape. Ammonia escape mechanism in carbon capture process using ammonia solution was discussed and experimental researches aimed for controlling ammonia escape in ammonia decarburization process were carried out. The impacts of ammonia concentration and temperature on ammonia slip in CO2 absorption process using a bubbling reactor were studied; the influences of three additives including ethylene glycol, glycerin and isoamyl alcohol on the inhibitions of ammonia escape were investigated too. The study showed that three additives have good inhibitory effects on ammonia escape, the maximum reduction proportions for ammonia escape are 44.44%, 65.90% and 54.84% within half an hour when additives of 1% were added, respectively; and the cumulative amount of volatile has been reduced by 35.86%, 46.38% and 42.87%, respectively. Three additives have little influence on decarburizing efficiency. Considering the inhibitory effect and economic factors, glycerin as the inhibiting additive for ammonia escape is the optimum choice.