無機塩による微粒子生石灰の改質を利用した粉粒流動層での高効率乾式脱硫

抄録

Effect of inorganic additives in limestone on desulfurization efficiency of SO₂ was investigated for dry desulfurization process with powder-particle fluidized bed (PPFB). The addition of inorganic compounds such as sodium chloride and sodium carbonate enhanced the reactivity of calcined lime powder with SO₂ in the PPFB. When 2wt% Na₂CO₃ or NaCl was added into limestone, the pore structure of lime powder was changed and SO₂ removal capacity was enhanced. In particular, Na₂CO₃ addition resulted in higher SO₂ removal efficiency than NaCl. When the average residence time of gas in the bed is as short as 0.1s, the SO₂ removal efficiency reached almost 100% at 1173K and Ca/S molar ratio of 2 for 7μm sorbent powder prepared from limestone with 2wt% Na₂CO₃, while for 5.3μm untreated lime, the corresponding SO₂ removal efficiency was 70%.