The particle size effect on decrepitation during the thermal decomposition of limestones and coal

Química Nova

Polito, Wagner Luiz¹  Crnkovic, Paula Manoel¹  Milioli, Fernando Eduardo¹  Pagliuso, Josmar Davilson¹  Universidade de São Paulo, São Carlos¹  Silva Filho, Claudionor Gomes da¹ 

关键词: limestone;    coal;    decrepitation.;   

DOI  :  10.1590/S0100-40422004000100012

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

The use of fluidized bed combustors to burn coal is largely studied to permit the addition of limestone to capture SO2. 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 ºC 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.

【 授权许可】

Unknown