CO2 Capture Performance of Calcium-Based Sorbents in the Presence of SO2 under Pressurized Carbonation

In order to understand the effect of SO2 on the CO2 capture performance under pressurized carbonation conditions, tests by orthogonal design were carried out in a calcination/pressurized carbonation reactor system. The effects of variables such as carbonation temperature, carbonation pressure, SO2 concentration, CO2 concentration, and the number of cycles on carbonation and sulfation were investigated. A range method was employed for analysis. Phase structure and scanning electron microscopy images were measured as supplement for a reaction study. Temperature increase enhanced the SO2 capture, leading to a rapid decay in CO2 uptake. The carbonation pressure had a stronger effect on the CO2 uptake than the temperature. SO2 uptake increased rapidly with increasing pressure while CO2 uptake decreased.