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The effect of varying pore structures on the kinetics of SO2–Ca O reactions is not fully understood in the previous studies.Combining fractal pore model,gas molecular movement model and two-stage reaction model,a new desulfurization model is established in this paper.Fractal pore model is used to simulate Ca O particle and gas molecular movement model is used to simulate gas diffusion in pores.Fractal dimension is used to characterize complexity of pore structure instead of tortuosity factor.It is found that the reaction is significantly affected by pore structures.A modulus is introduced to characterize the relationship between varying pore structures and apparent reaction parameters.And this relationship is verified by thermo-gravimetric analysis(TGA)data.Comparing to the previous models,the effect of varying pore structure on the kinetics of the reaction is described more accurately by the desulfurization model.
The effect of varying pore structures on the kinetics of SO2-CaO reactions is not fully understood in the previous studies. Combining fractal pore model, gas molecular movement model and two-stage reaction model, a new desulfurization model is established in this paper. Fractal pore model is used to simulate Ca O particle and gas molecular movement model is used to simulate gas diffusion in pores. Fractal dimension is used to characterize complexity of pore structure instead of tortuosity factor. It is found that the reaction is significantly affected by pore structures. A modulus is introduced to characterize the relationship between varying pore structures and apparent reaction parameters. And this relationship is verified by thermo-gravimetric analysis (TGA) data. Comparing to the previous models, the effect of varying pore structure on the kinetics of the reaction is described more accurately by the desulfurization model.