弱还原气氛下水稻秸秆对晋城无烟煤的助熔机理

文章编号:0253-2409(2016)12-1440-07

Received :2016-07-27;Revised :2016-09-18. *Corresponding author.Tel :0351-*******,Fax :0351-*******,E-mail :fengjie @https://www.wendangku.net/doc/5a11500803.html,.

The project was supported by the National Natural Science Foundation of China (21376158),the National Youth Science Foundation of China (21206104)and State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology ,Taiyuan University of Technology (MKX-201503).

国家自然科学基金(21376158),国家青年科学基金(21206104)和煤科学与技术省部共建国家重点实验室培育基地开放课题基金(MKX-201503)资助弱还原气氛下水稻秸秆对晋城无烟煤的助熔机理

秦育红1,韩晴晴1,任伟平1,赵子兵1,冯 杰2,*,李文英2,高松平2,3

(1.太原理工大学化学化工学院,山西太原 030024;

2.太原理工大学煤科学与技术教育部和山西省重点实验室,省部共建国家重点实验室培育基地,山西太原 030024;

3.太原工业学院化学与化工系,山西太原 030008)摘 要:以高灰熔点的晋城无烟煤和水稻秸秆为研究对象,通过CaO-Al 2O 3-SiO 2三元相图二X 射线衍射分析(XRD )和扫描电镜耦合X 射线能谱分析(SEM-EDX )研究了弱还原气氛下水稻秸秆对晋城无烟煤的助熔机理三随着水稻秸秆添加比例的增加,灰熔融特征温度呈下降趋势,灰中碱性氧化物CaO 二Na 2O 和K 2O 含量增多,结渣指数R b /a 值在0.20-0.69;当水稻秸秆添加量为20%(质量分数)时,流动温度(FT )降低至1369?,可满足气化炉液态排渣的要求;水稻秸秆的添加降低了灰中液相出现的温度,增加了液相物质出现的比例和几率,使灰更易发生熔融;混合灰中所形成的钠长石等低熔点矿物质以及钙长石二石英和莫来石所形成的低温共熔物导致灰熔点降低三

关键词:晋城无烟煤;水稻秸秆;CaO-Al 2O 3-SiO 2相图;矿物质;助熔机理

中图分类号:TQ 531.9 文献标识码:A

Fluxing mechanism of rice straw for Jincheng anthracite under weak reducing atmosphere

QIN Yu-hong 1,HAN Qing-qing 1,REN Wei-ping 1,ZHAO Zi-bing 1,FENG Jie 2,*,LI Wen-ying 2,GAO Song-ping 2,3

(1.College of Chemistry and Chemical Engineering ,Taiyuan University of Technology ,Taiyuan 030024,China ;2.State Key Laboratory Breeding Base of Coal Science and Technology Co-founded by Shanxi Province and the Ministry of Science and Technology ,Taiyuan University of Technology ,Taiyuan 030024,China ;3.Department of Chemistry and Chemical Engineering ,Taiyuan Institute of Technology ,Taiyuan 030008,China )Abstract :The fluxing mechanism of rice straw for Jincheng anthracite with high ash fusion temperatures was investigated under weak reducing atmosphere by CaO-Al 2O 3-SiO 2ternary phase diagram ,X-ray diffraction (XRD )and scanning electron microscopy coupled with energy dispersive X-ray spectrometry (SEM-EDX ).The fusion temperatures of blended ash decrease ,and the content of basic oxide CaO ,Na 2O and K 2O increases with increment of rice straw addition.The slagging index R b /a is between 0.20and 0.69.The fluid temperature (FT )declines to 1369?by adding 20%rice straw ,which could satisfy requirement of liquid slag discharge for gasifier.The addition of rice straw reduces the initial temperature and increases the occurrences proportion and probability of liquid phase in the ash.The formation of crystal albite with low melting point and eutectics formed from anorthite ,quartz and mullite lead the decrease of ash fusion temperatures.Key words :Jincheng anthracite ;rice straw ;CaO-Al 2O 3-SiO 2ternary phase diagram ;mineral matter ;fluxing mechanism

灰熔融特性的变化是煤气化炉正常运行的一个

重要因素,同时也是煤气化炉设计的关键因素之一,它决定着煤气化炉的排灰形式及气化反应温度的控

制三高温化和排灰液态化是煤气化炉主要发展趋

势,而中国灰熔点大于1400?的煤约占中国煤炭

年产量的55%[1],限制了这部分煤的工业大规模应

用三实现煤灰熔点的降低或调控,工业气化炉主要通过添加助熔剂石灰石,但是石灰石的加入,一方面,增大了灰处理量;另一方面,降低了系统冷煤气效率三除传统的石灰石外,任何能与煤灰中硅/铝氧化物形成低熔点物质的组分都可以作为助熔剂的备选,在最大限度降低外加矿物质的基础上,保证高的第44卷第12期2016年12月燃 料 化 学 学 报Journal of Fuel Chemistry and Technology Vol.44No.12Dec.2016万方数据