灰中焦对煤灰熔融特性的影响

采用连有电脑－摄像头的煤灰熔融特性测定装置，在Ar气氛下研究了灰中焦对煤灰熔融特性的影响。结果表明，灰中焦对灰熔融特征温度和灰熔融动态特征具有显著影响，影响程度与煤种以及煤焦的质量分数有关。掺焦的灰熔融温度高于不掺焦的熔融温度；掺焦量增加，其灰熔融温度升高。当掺焦量提高至20%时，在接近或高于煤灰熔融温度时由于焦与焦之间通过熔融煤灰的黏结作用形成了不熔骨架，使灰锥高度不再随温度的提高而发生变化，这也是灰锥很难出现或者根本不出现软化温度和流动温度的原因。

Effect of char on the melting characteristics of coal ash

The effect of char on the melting characteristics of coal ash was studied in the argon atmosphere using an ash fusion determinator connected with a camera and a computer.The results show that the coal char in ash has remarkable influence on the ash melting points as well as the ash melting behavior.The effects are related to the coal rank and the char content addition.For the coal ashes investigated,the deforming temperatures(DT),the softening temperatures(ST),and the flowing temperatures(FT) of all samples with the addition of coal char are higher than those of corresponding initial ashes.The ash melting points increase with the coal char addition amount.When the content of coal char is 20% and the temperature reaches or exceeds the corresponding original ash melting point,an infusible skeleton can be formed because of the sticking interaction between char and ash.When the skeleton is formed,the softening temperature and flowing temperature of the sample are difficult or impossible to occur.