Primary fragmentation of limestone under oxy-firing conditions in a bubbling fluidized bed
Primary fragmentation of limestone under oxy-firing conditions in a bubbling fluidized bed
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DOI：
10.1016/j.fuproc.2011.03.005
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发表时间：
2011-08
期刊：
影响因子：
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通讯作者：
C. Lupiáñez;F. Scala;P. Salatino;L. Romeo;L. I. Díez
中科院分区：
文献类型：
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作者：
C. Lupiáñez;F. Scala;P. Salatino;L. Romeo;L. I. Díez
在实验室鼓泡流化床中，模拟氧气燃烧条件下两种石灰石的一次破碎过程，并与传统空气燃烧条件下的一次破碎过程进行对比。测试了床层温度、颗粒尺寸和同时发生硫酸化反应的影响。在一个加热带装置进行了额外的实验，以确定是否发生初级破碎在高加热速率条件下，但在没有颗粒碰撞的情况下，实验结果表明，只有有限的破碎发生在所有操作条件下测试的石灰石。在氧燃烧条件下的主要碎片显着减少相对于空气燃烧的操作，最有可能是因为没有石灰石煅烧下高CO2气氛。热冲击后，石灰石喷入热bed.Particle破碎本身并不能引起显着的颗粒尺寸，床温和硫酸化反应的同时发生被发现并没有显着影响石灰石的主要破碎程度下氧燃烧和空气燃烧条件。相反，石灰石类型被认为是一个更重要的变量方面的破碎化趋势。
Primary fragmentation of two limestones was studied in a lab-scale bubbling fluidized bed under simulated oxy-firing conditions and, for comparison, under traditional air-firing conditions. The influence of bed temperature, particle size and simultaneous occurrence of sulphation reaction was tested. Additional experiments in a heated strip apparatus were performed to determine if primary fragmentation occurred under high heating rate conditions, but in the absence of particle collisions.Results of the experiments show that only limited fragmentation occurred to both limestones tested under all operating conditions. Under oxy-firing conditions primary fragmentation was significantly reduced with respect to air-fired operation, most likely because of the absence of limestone calcination under high CO2atmospheres. Thermal shock upon limestone injection in the hot bed appears not to be able to induce significant particle fragmentation by its own.Particle size, bed temperature and simultaneous occurrence of sulphation reaction were found not to influence significantly the limestone primary fragmentation extent under both oxy-firing and air-firing conditions. On the contrary, the limestone type was found to be a more important variable with respect to the fragmentation tendency.