油茶壳与煤掺混燃烧提升灰样的灰熔融温度

The Combustion of Camellia oleifera Shell Mixed with Coal Increases the Ash Melting Temperature of the Ash Sample

生物质与煤混合燃烧是减轻碳排放最有效的方法之一,对节约使用煤炭资源,发展生物质能源具有重要意义。以油茶壳(CS)和神木煤(SM)为研究对象,借助X射线荧光仪、X射线衍射仪、灰熔点测试仪和扫描电子显微镜,分析了不同掺混比的油茶壳与神木煤混合物(CS-SM)燃烧后的灰熔融特性。研究结果表明:添加CS能够明显改变CS-SM灰的灰熔融温度;CS-SM灰的灰熔融温度随着CS-SM中CS质量分数的增加而增加,其中软化温度增加的幅度最大,变形温度增加的幅度最小;当CS-SM中油茶壳掺混比不低于70%时,CS-SM灰的流动温度大于1 350℃,符合固态排渣要求;油茶壳与神木煤混合,在燃烧过程中发生了相互作用,生成了方解石、钙黄长石、六方钾霞石、方镁石等高熔点矿物质,从而导致了CS-SM灰的灰熔融温度升高;由扫描电镜图可知,CS-SM燃烧比较充分,灰渣颗粒随着CS-SM中CS质量分数的增加而增大。

Mixed combustion of biomass and coal was one of the most effective methods to mitigate carbon emissions,which was of great significance for the economical use of coal resources and the development of biomass energy.Taking Camellia oleifera shell(CS)and Shenmu coal(SM)as the research objects,the ash melting characteristics of the mixture of CS-SM with different blending ratios after combustion were analyzed with the help of X-ray fluorescence meter,X-ray diffractometer,ash melting point tester and scanning electron microscope.The results showed that:the addition of CS could significantly change the ash melting temperature of CS-SM ash;the ash melting temperature of CS-SM ash increased with the increase of CS mass fraction in CS-SM,where the softening temperature increased the most and the deformation temperature increased the least;when the blending ratio of CS in CS-SM was not less than 70%,the flow temperature of CS-SM ash was greater than 1350℃,meeting the solid-state slagging requirements;the CS was mixed with SM,and interactions occurred during the combustion process,generating high-melting-point minerals such as calcite,calcium yellow feldspar,hexagonal potassium chalcopyrite,and magnesite,which led to an increase in the ash fusion temperature of the CS-SM ash;from the scanning electron microscope diagram,it could be seen that CS-SM burned more fully,and the ash particles increased with the increase of the mass fraction CS in CS-SM.