The method of CO_2 capture by ammonia hydrate reaction system stands out from many CO_2 capture technologies due to its high capture efficiency

low equipment cost and wide range of applications

but it has ammonia escape issue. Therefore

an experimental system of variable height spray tower is designed and built independently to carry out experimental study about CO_2 absorption by ammonia method. By changing the operating parameters under low temperature conditions

the ammonia escape rate and CO_2 removal efficiency are obtained. The results show that

the ammonia escape rate increases with the ammonia temperature and ammonia concentration

while it decreases with the increase of the volume fraction of CO_2 and the diameter-height ratio of the spray tower. The CO_2 removal rate rises with the ammonia temperature and concentration

and decreases with the increasing CO_2 volume fraction and spray tower diameter-height ratio. The rules of ammonia escape and CO_2 absorption under different conditions obtained in this work can provide references for the development and improvement of ammonia CO_2 absorption technology.