中文摘要：

对肥城煤（FC）、淮南煤（HN）和大同煤（DT）3种典型的高中低硫煤作了煤岩学分析,利用DTA、XRD、SEM、光学显微镜和粒度分析仪对钙基矿物添加剂及其固硫灰渣进行了矿物学研究.主要研究了温度、钙硫比、矿物添加剂等因素对煤种固硫率的影响.实验表明,相同的燃烧条件下,不同煤种对碳酸钙适应性有很大差异,淮南煤和肥城煤对碳酸钙的适应性明显好于大同煤,高硫煤更有利于950℃和1050℃下固硫;煤样自身固硫能力较差,碳酸钙固硫效果显著,当Ca/S=4,燃烧温度分别为1050、850和950℃时,肥城煤、大同煤和淮南煤固硫率分别达到最高值（89%、72%和89%）;膨润土促进大同煤固硫,却降低了肥城煤和淮南煤固硫率;钙基矿物添加剂协同作用能更有效地提高低硫煤的固硫效果,在1050℃时,可将固硫率由51%提高到74%.

英文摘要：

The rock characteristics of three typical Chinese coals, high sulphur content of Feicheng coal （FC）, middle sulphur content of Huainan coal（HN） and low sulphur content of Datong coal（DT）, were analysed in this work . DTA, XRD, SEM, optical microscopy, and particles size measurement were used to study the mineral features of Ca-based mineral additives and calcined slag. Experiments were conducted to investigate effects of combustion temperature, Ca/S molar ratio, mineral addtives on sulfur retention during coal combustion. The results show that the sulfur retention of adaptability to CaCO3 differs greatly from coal types, the adaptability of HN and FC coal is better than DT coal, high sulphur content coal can achieve better S retention ratio ; Self-sulfur retention ability of each coal is poor. CaCO3 helps to improve sulfur retention ratio effectively, when Ca/S =4, eombusted at 1050℃, 850℃, 950℃ FC coal, DT coal, and HN coal can reach the highest S retention ratio of 89% ,72% , and 89% respectively; bentonite can promote sulfur retention ratio of DT coal, yet slow down the other coals. With CaCO3, vermiculite, and bentonite, a higher sulphur retention ratio of 74% can be achieved on DT coal even at 1050℃, which is increased from 51% comparing with the sample without adding vermiculite.