摘要
为了给液态排渣锅炉安全燃烧准东高碱煤提供理论依据,在水平管式炉上利用刚玉斜坡对添加不同质量分数SiO2、CaO、Fe2O3和MgO的准东煤灰渣在空气气氛下的流动性能进行研究.利用XRF技术对煤灰渣的钠质量分数进行分析,并通过钠捕获效率来表征煤灰渣的固钠效果.研究表明:SiO2和Fe2O3能够促进准东煤灰熔融.当SiO2的质量分数为10%时,煤灰渣由结晶渣逐渐转变为玻璃体渣,流动性能大大提高;而CaO和MgO则会抑制煤灰熔融,导致流动性能降低.随着SiO2添加比例的增加,灰渣对钠的捕获效率逐渐升高,当SiO2的质量分数达10%时,钠捕获效率由原先的23%上升至30%;而随着Fe2O3添加比例的增加,钠捕获效率缓慢降低.因此,当SiO2的质量分数为10%时即可有效改善煤灰渣的流动性能,又能提高钠的捕获效率.
The flow characteristics of Zhundong coal ash slag with different mass percentages of SiO2, CaO, Fe2O3 and MgO in air atmosphere were investigated by using corundum slope in the horizontal tube furnace, in order to provide theoretical basis for the safe combustion of Zhundong high alkali coal in Slag-tap Boiler. The sodium content of coal ash slag was analyzed by XRF technology, and the sodium capture efficiency was used to characterize the sodium fixation effect of coal ash slag. Results show that SiO2 and Fe2O3 can promote the melting of Zhundong coal ash. When the mass fraction of SiO2 was 10%, the type of coal ash slag gradually changed from crystalline slag to vitreous slag, thus greatly improving the slag flow performance. Conversely, CaO and MgO can inhibit the melting of coal ash, resulting in degradation of flow properties. With the increase of SiO2 addition ratio,the sodium capture efficiency of slag increased gradually. When the addition ratio reached 10%, the sodium capture efficiency increased from 23% to 30%. On the contrary, the sodium capture efficiency decreased slowly with the increase of Fe2O3 addition ratio. Therefore, adding 10% SiO2 can effectively improve the fluidity of coal ash slag and the efficiency of sodium capture.
作者
周陈颖
周昊
邢裕健
张佳凯
周明熙
ZHOU Chen-ying;ZHOU Hao;XING Yu-jian;ZHANG Jia-kai;ZHOU Ming-xi(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2020年第3期623-630,共8页
Journal of Zhejiang University：Engineering Science
基金
国家“973”重点基础研究发展规划资助项目(2015CB251501).
关键词
准东高碱煤
高温灰渣
添加剂
流动特性
钠捕获效率
Zhundong high alkali coal
high temperature slag
additives
fluidity
sodium capture efficiency
