Sulphation of limestones in a fluidized bed combustor: The relationship between particle attrition and microstructure

被引：29
作者：
Scala, Fabrizio [3 ]
Montagnaro, Fabio [2 ]
Salatino, Piero [1 ]
机构：
[1] Univ Naples Federico 2, Dipartimento Ingn Chim, I-80125 Naples, Italy
[2] Complesso Univ Monte St Angelo, Univ Naples Federico II, Dipartimento Chim, I-80126 Naples, Italy
[3] CNR, Ist Ric Combustione, I-80125 Naples, Italy
来源：
CANADIAN JOURNAL OF CHEMICAL ENGINEERING | 2008年 / 86卷 / 03期
关键词：
fluidized bed combustion; limestone; sulphation; attrition; fragmentation;
D O I：
10.1002/cjce.20069
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Sulphation of two limestones in a fluidized bed combustor has been investigated. One limestone (coarse-grained) was characterized by a significant population of relatively large pores after calcination; the other (fine-grained) presented a finer and fairly unimodal pore size distribution. Differences in the microstructure were reflected by different thickness of the sulphate shell formed upon sulphation and ultimate calcium conversion degree. Particle attrition/fragmentation were fairly small under moderately bubbling fluidization conditions. Fragmentation upon impact was significant. The fine-grained limestone, characterized by a thinner sulphate shell, was more susceptible to fragmentation than the other. Particle fragmentation discloses unreacted CaO enabling secondary sulphation of exhausted particles.
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页码：347 / 355
页数：9
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