石灰/石灰石粉吹き込みによる酸性ガス除去反応に関する理論研究 (地球環境問題<特集>)
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概要
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Reaction-rate equations and acid gas concentration exponent <I>m</I><SUB>1</SUB> were derived theoretically by applying the shell mode to the lime aerosol-SOx/HC<I>l</I> reaction system. The following results were found by applying experimental data to the theoretical equation.<BR>(1) For the changes of stoichiometric ratio, acid gas concentration and reaction time, the theoretical rate equation of product layer diffusion control is in good agreement with experimental data.<BR>(2) Judging from theoretical analysis of acid gas concentration, the controlling step of both SOx and HC<I>l</I> removal reactions by lime aerosol is the diffusion process in the product layer.<BR>This mechanism of product-layer diffusion control has been empirically allumed up to now. The validity of the theoretical equations was verified by agreement with above 2 points.<BR>Furthermore, according to theoretical analysis of the particle radius exponent <I>m</I><SUB>2</SUB>, the <I>m</I><SUB>2</SUB> value should be 0.850.97 under the normal SOx removal condition, but an <I>m</I><SUB>2</SUB> value of about 0.35 or less is observed in many experiments. And it has been suggested that the dependence of particle size for lime conversion is small. This gap between theory and experiment is due to aggregation of fine particles in the lime aerosol, it is thought.
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