Ash effects during combustion of lignite/biomass blends in fluidized bed
Ash effects during combustion of lignite/biomass blends in fluidized bed
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DOI：
10.1016/j.renene.2009.05.005
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发表时间：
2009-12
期刊：
影响因子：
8.7
通讯作者：
D. Vamvuka;M. Pitharoulis;G. Alevizos;E. Repouskou;D. Pentari
中科院分区：
文献类型：
--
作者：
D. Vamvuka;M. Pitharoulis;G. Alevizos;E. Repouskou;D. Pentari
为了研究矿物质在评价低阶煤和生物质材料共烧应用中的作用，在实验室规模的流化床设施中燃烧地中海国家的农业残留物特性，一种褐煤及其与生物质比例高达20%wt的混合物。粉煤灰和床料的矿物学，化学和形态分析和结渣/污垢和团聚倾向进行了表征。结果表明，每种燃料单独燃烧都可能引起中度或高度沉积问题。原燃料的燃烧产生的飞灰富含钙，硅和铁矿物，以及钾和钠矿物的情况下，生物质样品。然而，混合燃料导致减少的Ca，Fe，K和Na，而增加的Si和Al元素的飞灰相比，褐煤燃烧，这表明较低的沉积和腐蚀问题，在锅炉燃烧这些混合物。使用铝土矿作为添加剂，使底灰富含钙化合物。在燃烧测试的条件下，没有注意到灰烬沉积或床层团聚的迹象。
Aiming at investigating the role of minerals in evaluating co-firing applications of low rank coals and biomass materials, agricultural residues characteristic of the Mediterranean countries, one lignite and their blends with biomass proportions up to 20% wt, were burned in a lab-scale fluidized bed facility. Fly ashes and bed material were characterized in terms of mineralogical, chemical and morphological analyses and the slagging/fouling and agglomeration propensities were determined. The results showed that combustion of each fuel alone could provoke medium or high deposition problems. Combustion of raw fuels produced fly ashes rich in Ca, Si and Fe minerals, as well as K and Na minerals in the case of biomass samples. However, blending of the fuels resulted in a reduction of Ca, Fe, K and Na, while an increase of Si and Al elements in the fly ashes as compared to lignite combustion, suggesting lower deposition and corrosion problems in boilers firing these mixtures. The use of bauxite as an additive enriched bottom ash in calcium compounds. Under the conditions of the combustion tests, no signs of ash deposition or bed agglomeration were noticed.