Limestone fragmentation and attrition during fluidized bed oxyfiring
Limestone fragmentation and attrition during fluidized bed oxyfiring
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DOI：
10.1016/j.fuel.2009.03.024
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发表时间：
2010-04
期刊：
影响因子：
7.4
通讯作者：
F. Scala;P. Salatino
中科院分区：
文献类型：
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作者：
F. Scala;P. Salatino
在模拟流化床富氧燃烧条件下，石灰石的磨损/破碎的研究是通过一个实验协议，已经开发的表征磨损/破碎的吸附剂在空气吹常压流化床燃烧器。该议定书是基于使用不同的和相互补充的技术。在实验室规模的流化床燃烧器在模拟富氧燃烧条件下进行的实验中，由表面磨损的磨损的程度和模式的流化床的密相进行了评估。吸附剂样品在模拟oxyfiring测试过程中产生的进一步特点，从破碎的角度来看，高速冲击，通过一个专门设计的颗粒撞击器。结果表明，在煅烧阻碍条件下的磨损和破碎模式发生在空气吹大气燃烧条件下有很大的不同。值得注意的是，磨损/破碎通过连续再生暴露的颗粒表面来增强颗粒硫酸化。
Attrition/fragmentation of limestone under simulated fluidized bed oxyfiring conditions was investigated by means of an experimental protocol that had been previously developed for characterization of attrition/fragmentation of sorbents in air-blown atmospheric fluidized bed combustors. The protocol was based on the use of different and mutually complementary techniques. The extent and pattern of attrition by surface wear in the dense phase of a fluidized bed were assessed in experiments carried out with a bench scale fluidized bed combustor under simulated oxyfiring conditions. Sorbent samples generated during simulated oxyfiring tests were further characterized from the standpoint of fragmentation upon high velocity impact by means of a purposely designed particle impactor. Results showed that under calcination-hindered conditions attrition and fragmentation patterns are much different from those occurring under air-blown atmospheric combustion conditions. Noteworthy, attrition/fragmentation enhanced particle sulfation by continuously regenerating the exposed particle surface.