HOT GAS DESULFURIZATION WITH ZINC TITANATE SORBENTS IN A FLUIDIZED-BED .2. REACTOR MODEL

High-temperature high-pressure sulfur removal is considered to be one of the key steps in the hot gas cleanup train of an integrated gasific ation combined cycle (IGCC) process. Regenerable mixed metal oxide sor bents such as zinc titanates are prime candidates for this purpose. As part of sulfur removal process development, Carbona Corp. is developi ng fluidized bed reactor models for scale-up. In the first part of thi s work, the parameters for the unreacted shrinking core and overlappin g grain models were determined to describe the rate of zinc titanate i n H2S capture. A method using these sorbent particle conversion models for fluidized bed application is presented in this paper. Both models show a reasonably good fit to the high-pressure fluidized bed sulfida tion test data, with the same order of magnitude parameters as obtaine d in the previously reported solid conversion rate tests.