流化床燃烧中煤含灰量对灰渣形成特性的影响

为了研究煤颗粒灰质量分数对煤在流化床燃烧过程中灰渣形成特性的影响,在一台小型流化床反应炉上进行煤的灰质量分数对灰渣形成特性的实验.按煤颗粒的灰质量分数,把义马烟煤分为6个颗粒组,并选用各颗粒组的3个粒径范围的煤颗粒进行燃烧实验,研究煤颗粒的灰质量分数对底渣质量分数、底渣与飞灰中的碳量质量分数和粒径分布的影响.结果表明,随着煤颗粒灰质量分数的增加,燃烧形成的底渣质量分数增加,而煤颗粒的燃尽率和飞灰中的碳质量分数都降低.在粒径和燃烧时间相同的条件下,随着颗粒灰质量分数的增加,底渣中留在本粒径档的颗粒质量分数明显增加,而细颗粒的质量分数明显减少.而颗粒灰质量分数对飞灰的粒径分布没有明显的影响.

Experiments on effects of coal particle ash content on ash formation during fluidized bed combustion

To investigate the influences of coal particle ash content on the ash formation behaviors during fluidized bed combustion,experiments were conducted on a bench-scale fluidized bed combustor.Yima bituminous coal samples were divided into 6 ranks with different ash content.For every rank of coal sample,3 size ranges were used in the experiments.The results show that the mass fraction of the bottom residue increases with the ash content of the coal particles,while the burnout of coal particles and the carbon content of the fly ash decrease with the ash content of coal particles.The mass fraction of the bottom residues which have the same size range as the initial size range of the coal particles increases with the ash content.While the ash content of coal particles has no obvious influence on the size distribution of the fly ash.