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

Quimica nova

Polito, Wagner Luiz¹  Crnkovic, Paula Manoel¹  Milioli, Fernando Eduardo¹  Pagliuso, Josmar Davilson¹  Silva Filho, Claudionor Gomes da¹ 

[1] Universidade de São Paulo, São Carlos

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 useof fluidized bed combustors to burn coal is largely studied to permit the additionof limestone to capture SO2. The particle size for coal and limestoneis an important parameter in this process. Thermogravimetry (TG) is used toelucidate the combustion and sulfation processes, but the experimental parametersmust be evaluated to be representative in fluidized bed combustors. In the presentstudy the effect of particle size is analyzed in the calcination of limestonesand the combustion of coal through the thermogravimetric curve for limestoneand derivative thermogravimetric curve for coal. Small peaks representing masslosses between 400 and 500 ºC are observed due to the jumping ofparticles out of the crucible. This effect, recognized as decrepitation is observedfor mid-sized particles provoked by the release of water vapor trapped withintheir lattice.

【 授权许可】

CC BY