| 초록 |
Absorption process using alkali solutions is the standard industrial method for removing CO2. However, the regeneration of large amount of solution by steam causes an increase in cost of electricity. Therefore, there have been many efforts to reduce the CO2 capture cost by phase changing solvent. Precipitating K2CO3 solution with high concentration is a promising solvent for reducing CO2 capture cost by selectively regenerating CO2-rich KHCO3 slurry which is separated from CO2-lean aqueous solution. Since large amount of water is removed by cooling crystallization of KHCO3, sensible heat and latent heat of water can be reduced. However, the yield of KHCO3 is not enough because the solubility is very limited when the solution is cooled by typical cooling water. Therefore, in this study, some alkanolamine antisolvents were used to enhance the crystal yield by further reducing the solubility. From the results using a continuous cooling crystallizer, their effect on crystal size distribution, crystal growth rate, and ion compositions in solution will be presented. |
