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The nw1n objeclivc of lhis work was lo compare lhe· reaclivily of limeslones wilh narrow and open parlicle size distribution in a bubling lluidized bed rcactor and veri fy if the reactivity or lhe open sized mixtures could be predicled, using lwo simple moclels, from lhe known parameters o f the narrow sizecl particlcs. five narrow sizes were used, respectivcly 385, 460, 545, 650 anel 775 pm for lwo differenl limeslones, one Calcitic (Cl) and one Dolomilic (DP). Using this samc material and one of the modcls, tour mixtures wcre preparecl with 498, 540, 543 anel 6 17 pm of average diameter. The mixlure or 540 pm had an aproximalcly normal di stribulion o r sizcs anel lhe mixturc o r 543 pm a llat one. The becl , wilh I 60 mm o r diameler. was tluidized wilh ai r at a tcmperature o f 850"C. and ~ kg or sand \\'i th thl:! same sizc as the limcst0111.:s. \\'as uscd as lhe bcd materi al. A llow o f S0 2 was mix(~d with the tluidization a ir prior to the gas distributor, producing a uni l'orm cone ' ntration of about 1000 ppm al lhe reaclor gas exaust. Thc limeslone was then introduced in a batch of 50g and lhe S0 2 concentration monilorccl. The changc in lhe S02 concentration a fter thc limestone was introcluced in the reaclor was uscd to derive thc reacti ve parameters, namely the conversion, rale oi' convcrsion anel global coeiTicicnt of reaction rate . The parliclc size distribution models produced a good correlation among the mixtures anel lhe narrow s ized parti cles during sul fa tation. The calcinalion proccss was more slow for lhe opcn distribution or limestone DP but not afTec tecl for Cl. In ali cases therc \\'HS a clear incrcase in tlte S02 absorplÍOI1 as the parl icle SÍZC was reduceci. Limestone DP was much more clTecti ve in the remova! of S0 2 than Cl. Keyworcls: lluiclized bcd; limestone; sulfatation; calc ination.

Efeito da distribuição granulométrica do calcário na absorção de SO2 em reator de leito fluidizado

Efeito da distribuição granulométrica do calcário na absorção de SO₂ em reator de leito fluidizado