硫元素对煤灰熔融性影响机理研究

Study on ash fusibility affected by sulphur and fusion mechanism

向林南仓煤和刘庄煤中分别添加含钙试剂(CaSO_4、CaO),使WCaO(%)分别为0.82,1.65,2.47,3.29,4.12,测定加钙煤灰熔融温度,利用X射线衍射仪(XRD)、扫描电子显微镜和X射线能谱仪(SEM-EDX)等测试手段研究渣样的晶体矿物组成、表观形貌和微区化学组成。结果表明,随着含钙试剂添加量的增大,煤灰熔融温度先降低后上升,添加CaSO_4后的灰熔融温度降低幅度更大;刘庄煤添加CaSO_4后,随着温度升高,渣样中以钙长石和莫来石为主,而添加CaO后,高温下渣样中仅存在莫来石;高温下硫在灰渣中以(Fe-O-S)melt共熔体或FeS晶体形式存在。

Linnancang coal,Liuzhuang coal was selected and added with calcium base flux（CaSO_4,CaO）to make WCa O（ %） = 0. 82,1. 65,2. 47,3. 29,4. 12. The ash fusion characteristics temperature was tested,and the crystalline mineral constituents,surface morphologies and micro-chemical composition of slag sample were investigated by XRD and SEM-EDX. The results show that the ash fusion temperatures would show reducing first and increasing then with addition of the calcium base flux. The ash fusion temperatures of coal decreased more apparently when adding CaSO_4. With the increase of temperature,anothite and mullite were founded in Liuzhuang slag with addition of CaSO_4,while mullite was only found in slag with addition of CaO.（ Fe-O-S）meltand the crystal of Fe S was found in slag at high temperature.