准东煤灰熔融特性试验研究

将神华准东煤（神华煤）和天池能源准东煤（天池煤）与碱沟煤按照不同质量掺混比进行混合并制得灰样,将NaCl、CaO、Al2O3和SiO2按不同添加比例加入神华煤和天池煤并制成灰样,对上述混合灰样的熔融特性进行研究.结果表明：碱沟煤掺混2种准东煤后,随着准东煤质量掺混比的增大,混合灰各个灰熔点特征温度先降低后升高;随着灰样中Na含量增加,准东煤灰样的变形温度显著降低,软化温度、半球温度和流动温度先降低后趋于不变;当灰样中Na含量达到一定比例后,NaCl对准东煤灰熔融特性的影响明显减弱;CaO对准东煤灰熔点的影响较复杂,可以降低也可以提高灰熔点;随着Al2O3添加比例的增加,准东煤灰熔点先升高后急剧降低;随着SiO2添加比例的增加,神华煤灰样的变形温度先升高后降低,而天池煤灰样的变形温度逐步升高,其他3个特征温度均逐渐降低.

Experimental Study on Ash Fusion Characteristics of Zhundong Coal

Experimental tests were performed to study the ash fusion characteristics of coal mixtures prepared with Zhundong coal （respectively from Shenhua and Tianchi Energy） and Jiangou coal in different blending ratios,and of mixtures prepared by blending following additives into above two kinds of Zhundong coal,such as NaCl,CaO,Al2O3 and SiO2 in different ratios.Results show that for the Jiangou-Zhundong coal mixture,the ash fusion temperature drops first and rises later with the increase of blending ratio of Zhundong coal.For the mixture of Zhundong coal added with various additives,the ash deformation temperature（DT） decreases significantly,while the ash soft temperature （ST）,hemispherical temperature （HT） and flow temperature（FT） drop first and then get stable,with the increase of Na content; the influence of NaCl on the coal ash fusibility is significantly weakened when the Na content reaches a certain percentage; the influence of CaO on the coal ash fusibility is very complicated,it can both improve and reduce the ash fusion temperature of the mixture; with the rise of Al2O3 content,the ash fusion temperature of Zhundong coal first increases then decreases sharply; with the rise of SiO2 content,the ash DT of Shenhua Zhundong coal first rises then drops,and that of Tianchi Energy Zhundong coal increases gradually,while other three characteristic temperatures of the Zhundong coal reduces gradually.