锅炉技术2026，Vol.57Issue(2)：49-54,6.
低灰熔点煤的熔融特性研究分析
Study on the Fusion Characteristics of Low Ash-Fusion-Temperature Coals
摘要
Abstract
During the combustion of low ash-fusion-temperature coal,severe melting phenomena occur,leading to the fouling of heat exchange surfaces.Long-term operation can result in serious slagging.Therefore,studying the melting characteristics of low ash-fusion-temperature coal is of significant importance.Three different low ash-fusion-temperature coals with varying ash contents were analyzed,along with a high ash-fusion-temperature coal.The slagging indices were calculated based on the ash composition and fitted with the ash fusion temperature.Coal ash was prepared at different temperatures,and the variations in the content of alkali/alkaline earth metals in the ash were investigated,along with their influence on the prediction of slagging characteristics.The study found that the content of calcium and iron metals in low ash-fusion-temperature coals was much higher than in high ash-fusion-temperature coal.The acid-base ratio(B/A),silica ratio(G),silica-alumina ratio,iron-calcium ratio,and a comprehensive index all showed a certain relationship with the ash soft temperature.However,the comprehensive index and the silica-alumina ratio had a better linear relationship with the ash soft temperature.High-temperature viscosity experiments showed that when the flue gas temperature decreased to the ash flow temperature,the viscosity of the ash increased rapidly,leading to its adhesion to heat exchange surfaces.As the coal ash preparation temperature increased,the sodium content in the ash decreased rapidly,while the relative content of iron and calcium showed an increasing trend.The magnesium content first increased and then decreased.关键词
低灰熔点煤/结渣/灰熔融/碱金属/高温黏度Key words
low ash-fusion-temperature coal/slagging/ash fusion/alkali metals/high-temperature viscosity分类
能源科技引用本文复制引用
沈兰,于洁,成丽波,秦荣江,程型,赵义,陈雪林,陈辉,王秀军,李明洲..低灰熔点煤的熔融特性研究分析[J].锅炉技术,2026,57(2):49-54,6.基金项目
国家自然科学基金面上项目(52076091) （52076091）
国家能源集团科技创新项目(GJNY-24-69) （GJNY-24-69）
