摘要
本文用脉冲二氧化硫荧光分析仪连续测试了煤样中二氧化硫的浓度,并用X荧光、X衍射和电子扫描电镜等方法,分析了添加钠离子样品的含硫率、物相及表面形貌,实验结果表明,钠离子添加剂改变了二氧化硫释放过程,抑制了硫酸钙的分解.灰样成分中既有稳定的三元化合物3CaO·3Al_2O_3·CaSO_4,也有不稳定的化合物硫酸钙存在,说明钠离子添加剂对提高固硫率有促进作用.
The sulfur dioxide release pattern during coal briquette combustion was monitored with a pulse fluorescence analyzer. The sulfur contents, crystalline phases, surf ace morphology and surface segregation over micro-area range of the ashes and slags were determined by X-ray fluorescence (XRF), X-ray diffraction(XRD), scanning electron microscopy (SEM) and energy-dispersive X- ray analysis (EDXA). Both the thermally stable ternary compound 3CaO·3A12O3 · CaSO4 and thermally less stable (over a temperature range of 1200-1350℃) simple compound CaSO4 were found in the combustion products. This fact suggests that the sodium additives can promote the formation of the thermally more stable ternary compound, probably through enhancing the diffusion rates of cations in the solids,and can suppress the decomposition of the thermally less stable gypsum through encapsulating the gypsum grains by a molten layer of sodium silicate.
出处
《环境化学》
CAS
CSCD
北大核心
1994年第6期492-497,共6页
Environmental Chemistry
关键词
型煤
燃烧
固硫
钠离子效应
助剂
coal briquette combustion,sulfur fixation,role of sodium additives.
