Abstract
Kinetics of NH3 emission in the absorption process of carbon dioxide (CO2) from fossil fuel power plant flue gases was studied using a typical range of CO2 absorption conditions (i.e., 3–7mol/L MEA, 6–21% O2, 0–0.45 CO2 loading, 0–800ppm SO2 and NO2 derived products in MEA solution; H2SO3 and HNO3, and 328–393K temperature). This study presents kinetic rate information of NH3 emission as a function of CO2 capture parameters in which an increase of MEA and flue gas O2 concentrations and temperature all increased the emission rate of NH3. On the other hand, increase of CO2 loading and concentration of H2SO3 and HNO3 inversely affected the emission rate. A useful kinetic rate equation for estimation of NH3 emissions is also proposed: rNH3 emission={1.75×10−6e−(0.62/RT)[MEA]0.38[O]3.41}/{1+0.86[CO2]0.57+0.46[H2SO3]0.16+1.45[HNO3]0.08}. The goal is to help plant operators to quickly identify NH3 release from the CO2 capture system. The rate equation developed in this study represents one of only a few capable of providing truly quantitative information on NH3 emissions.
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