燃煤固体产物中元素分布特征

Distribution Characteristics of Elements in Burned Coal Solid Products

利用中子活化分析、原子发射光谱等元素分析方法研究我国典型低钙和高钙燃煤固体产物中的元素分布。结果表明 :亲硫元素与有机结合态元素 (As、Se、Sb、Co、Ni)从底灰—飞灰—结渣—沾污的含量依次增高 ,而稀土元素和放射性元素 (U、Th)则与之相反。在燃煤飞灰中 ,铁质颗粒中多数微量元素的含量高于钙质和硅铝质颗粒。

Through the use of element analysts methods, such as neutron activation analysis and atomic emission spectrometry, etc an investigation is conducted of the elements distribution in typical low-calcium and high-calcium burned coal solid products. The results of the investigation indicate that sulfur-affinity element and organically bonded-state elements (As, Se, Sb, Co, Ni) have their quantity increased consecutively, depending on the content of bottom ash-fly ash-slag-fouling. Meanwhile, rare earth elements and radioactive element (U, Th) on the contrary assume an opposite tendency. In the fly ash of burned coal the content of many trace elements in iron particles happens to be higher than that of calcium and silicon-aluminum particles. The distribution characteristics of in-coal accompanying elements in the combustion products is related to the chemical properties and assigned state of the element itself.