MULTIPLE REACTOR TESTING OF A SYNTHETIC SORBENT FOR REGENERATIVE SULFUR CAPTURE IN FLUIDIZED-BED COMBUSTION OF COAL

A new synthetic regenerable sorbent was developed as an alternative to limestone and dolomite for regenerative sulfur capture in fluidized bed combustion (FBC) of coal. The sorbent consists of CaO (8-9 wt%) on a spherical 3 mm diameter gamma-Al2O3 support. A shrinking unreacted core model (SURE2) is proposed to describe the sulfation process. Experiments have been carried out in a 12 mm internal diameter fixed bed reactor, a 0.05 m ID fluidized bed reactor and a thermobalance. The results obtained for all three reactors are in good agreement with the predictions of the SURE2 model.