Study on CO2 capture using dry potassium-based sorbents through orthogonal test method

The effect of reaction conditions on the carbonation characteristics of K2CO3 calcined from KHCO3 was investigated with a pressurized thermogravimetric apparatus. Results show that the conversion rate decreased as the reaction temperature and pressure increased, and the effect of CO2 and H2O concentration is little. The mean reaction rate maintained constant of 3%/min. The maximum reaction rate increased as the temperature and H2O concentration increased, and the pressure decreased. The reaction temperature and pressure are the key factors, and it is important to control those carefully for this technique. The optimum reaction condition is 60 °C, 18% CO2, 18% H2O, and 1 atm. K2CO3 calcined from KHCO3 showed excellent CO2 capture capability in this condition.