(545u) Effect of Aerosol on MEA Slip in Capturing Carbon Dioxide

Large-scale deployment of post-combustion CO2 chemical capture, absorption by chemical solvents have been demonstrated to be possible. One of the remaining concerns is the leakage of amines, which may result in the damage of human health and environment.

Literature revealed that amine slip increases in the presence of aerosol particles in the flue gas. However, systematic investigation of the mechanism is still absence. In this research, aerosol was generated by an generator TSI-3076. A particle size analyzer TSI model 3330 was used to analyze the particle size distribution and particle counts in the aerosol created. The FTIR instrument Gasmet DX-4000 was calibrated to measure MEA concentrations in the outlet gas stream.

If no aerosol was introduced into the inlet gas of Packed Bed, Aspen plus shows that the concentration of MEA in the slip stream is about 37 ppm. This value is out of the range of the Gasmet, so analysis shows that there is no MEA in the slip stream. It was found that the average size of the particle generated is about 0.3 mm and the particle count is about 10⁵~10⁶ #/cm³. With the introduction of sulphuric acid aerosol, the concentration of MEA in the slip stream is about 1100~1400 ppm, whereas the particle will grow to about 1.2 mm and the particle counts was not changed much. If the sucrose aerosol was introduced into the inlet gas, the concentration of MEA would reduce to about 400~750 ppm. The result indicates that the property of nuclei can affect the MEA emission.

If the sulfuric acid aerosol was introduced into the Rotating Packed Bed, the concentration of MEA is about 10~200 ppm. It shows that RPB has lower MEA emission than normal absorber.

Acknowledgement: This work is financially supported by National Energy Program-Phase II: MOST 107-3113-E-007-002