The experimental research on the CFB-FGD of semi-dry process in ambient temperature were conducted in a demo plant of Tsinghua university. The designed flow rate of flue gas treated by the CFB-FGD demo plant was 20,000Nm~3/h. In order to achieve the internal circulation of solid particles, special structure was adopted within the absorber of the CFB-FGD.A series of experiments were carried out to investigate the influence of basic operating parameters such as approach-to-saturation temperature (ASAT), Ca/S ...