三元配煤矿物因子对煤灰熔融特性影响及熔融机理

Study on mineral factor of ternary-component blended coal on coal ash fusibility and its fusion mechanism

为研究配煤中矿物组成对煤灰熔融特性的影响,选取煤灰化学组成和煤灰熔融温度差异较大的3个原煤a,b,c进行三元配煤实验,利用X射线衍射(XRD)及X射线荧光光谱法(XRF)分别测定了煤样矿物组成和煤灰化学成分,并对高温煤灰熔融机理进行研究。结果表明:引入矿物因子(MF)来表征煤样矿物组成(耐熔矿物、助熔矿物)对高温煤灰熔融特性的影响具有一定的可靠性。高温下低灰熔融温度矿物钙长石钙含量的升高与高灰熔融温度莫来石矿物含量的减少共同导致了煤灰熔融温度的降低;在煤灰流动温度左右,钙长石物相最强衍射峰强度的高低以及低温共熔物相对含量的高低与煤灰流动温度呈现一定的负相关性,石英和莫来石则相反。

The work described in this paper was to determine the improved high-temperature ash-fusion behavior by means of ternary-component blended coal technique. All the experiments based on three kinds individual coal which existed remarkable difference in coal ash chemical composition and ash fusion temperature. According to ternary-com- ponent blended coal with a certain proportion, mineral components and ash chemical composition were analyzed by X- ray diffraction （XRD） and X-ray fluorescence （XRF） separately. The results show that refractory minerals and fluxing minerals in coal have a prominent effect on high-temperature ash-fusion behavior. Mineral Factor（MF） is introduced to characterize this influence between minerals and ash-fusion behavior. Moreover, with the more content of anorthite, the fusion temperature will decrease more obviously, while the law of mullite is just the opposite. Meanwhile, A negative correlation is found between the strongest peak intensity of anorthite as well as the relative content of amorphous glass and the ash flow temperature, quartz and mullite are just on the contrary about ~T temperature. High-temperature ash- fusion behavior can be improved by utilizing ternary-component blended coal technique.