热力发电2018，Vol.47Issue(1)：59-65,7.DOI:10.19666/j.rlfd.201705032
飞灰中晶体矿物及非晶体与残碳分布的关系
Relationship of crystal minerals and amorphous as well as residual carbon distribution in fly ash
摘要
Abstract
In order to study the distribution regularities of fly ash in circulating fluidized bed boilers, the fly ash with different densities at the same particle size was analyzed using X-ray diffraction (XRD), Maud (whole pattern fitting) and scanning electron microscope (SEM). The distribution regularities of crystalline minerals, amorphous glass and residual carbon in fly ash were investigated. The results show that the mass fraction of the residual carbon in fly ash varied with density. For the fly ash with small densities, unburned carbon would form due to the fly ash's short residence time in the circulating fluidized bed, so the residual carbon content was high. On the other hand, the fly ash with large densities showed a low carbon content because of its long residence time in the circulating fluidized bed (reaching full combustion). The residue carbon content reached the maximum in the fly ash with density ranging from 1.85×103 kg/m3 to 2.15×103 kg/m3. The crystal minerals existed uniformly in the fly ash with different densities. The crystalline minerals, amorphous glass and residual carbon showed dependent distribution patterns. The residual carbon coexisted with Si-Al amorphous minerals in the fly ash. The results provide the basis for the utilization of fly ash in circulating fluidized beds.关键词
煤矸石/飞灰/密度/晶体矿物质/非晶玻璃相/残碳Key words
gangue/fly ash/density/crystalline minerals/amorphous glass/residual carbon分类
化学化工引用本文复制引用
梅丹,崔志刚,马素霞..飞灰中晶体矿物及非晶体与残碳分布的关系[J].热力发电,2018,47(1):59-65,7.基金项目
山西省青年科技研究基金资助项目(2015021124) Shanxi Youth Science and Technology Research Foundation (2015021124) （2015021124）
