| Numerical calculation was carried on a small-scale fluidized bed to reveal its fluidization behavior firstly which was tested by experimentation,and then four different kinds of grains were tested in this fluidized bed to find the best inert carrier for thermal test. And then the promotion effect to CaO desulfurization by nanometer TiO2 were investigated by thermogravimetric analysis method and the results reveal that: the conversion of CaO is higher in higher temperature in the presence of oxygen, while lower in the absent of oxygen; oxygen act side effect in CaO desulfurization, which may be weakened by nanometer TiO2; Nanometer TiO2 have a promotion effect for CaO conversion which was about 22% in temperature 650～750℃. The kinetic behavior of desulfurization can be described by unreacted shrinking reaction core model which indicate that the overall rate of desulfurization is controlled initially by surface chemical reaction, and then controlled by layer diffusion, and nanometer TiO2 can prominent affect the second stage to promote CaO desulfurization.
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