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O efeito da granulometria na decrepitação durante a decomposição térmica de calcários e carvão

2004; Brazilian Chemical Society; Volume: 27; Issue: 1 Linguagem: Inglês

10.1590/s0100-40422004000100012

1678-7064

Paula Manoel Crnkovic, Wagner Polito, Claudionor Gomes da Silva Filho, Fernando Eduardo Milioli, Josmar Davilson Pagliuso,

Granular flow and fluidized beds

The use of fluidized bed combustors to burn coal is largely studied to permit the addition of limestone to capture SO 2 .The particle size for coal and limestone is an important parameter in this process.Thermogravimetry (TG) is used to elucidate the combustion and sulfation processes, but the experimental parameters must be evaluated to be representative in fluidized bed combustors.In the present study the effect of particle size is analyzed in the calcination of limestones and the combustion of coal through the thermogravimetric curve for limestone and derivative thermogravimetric curve for coal.Small peaks representing mass losses between 400 and 500 o C are observed due to the jumping of particles out of the crucible.This effect, recognized as decrepitation is observed for mid-sized particles provoked by the release of water vapor trapped within their lattice.