Experimental Study on the Characteristics of CO2 Capture with Spray Towers Using Ammonia Solution

Experiments were conducted to identify basic characteristics of CO2 capture using a spray tower with a single nozzle. Results were evaluated in terms of CO2 saturation which is the main determining factor of regeneration energy, and capture efficiency under various operating conditions. Changes in the capture efficiency under various conditions are well expressed as a monotone increasing function of the relative solvent (NH3):CO(2 )flow rate. Although changes in CO2 saturation are also well described as a function of the NH3/CO(2 )flow rate ratio, these are expressed as a monotone decreasing function, in contrast with the increasing function of CO2 efficiency. In recent research on the relationship between CO2 saturation and capture efficiency, CO2 saturation was found to decrease when capture efficiency increased. In conclusion, the results show that the amount of solvent used for achieving high capture efficiencies is excessive, as is the amount of regeneration energy needed.