Oxidation Reaction of Calcium Sulfide in an Advanced PFBC Condition (II)
Sulfation Reaction and Grain Model Application
1999 年 78 巻 9 号 p. 750-759
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1999 年 78 巻 9 号 p. 750-759
The effects of particle size, O2 concentration, temperature, and sorbent type on sulfation of calcium sulfide were investigated at temperatures of 650 to 850°C Calcium sulfide particle is oxidized to CaSO4 through reaction: CaS + 2O2↑CaSO4 when reaction temperature is below 850°C. CaS particle with a diameter below 0.005 mm was found to achieve complete conversion to CaSO4. However, CaS particle with a diameter above 0.02 mm wasn't be completely converted to CaSO4 due to the pore blockage of sulfate product layer. A kinetic study of the sulfation reaction (CaS + 2O2 ↑CaSO4) has shown its activation energy to be 57.2 kJ/mol. A grain model has been developed to analyze the oxidation reaction within a CaS particle. The effects of temperature, O2 concentration, particle size and type of limestone on the reaction process were discussed.
