阴离子型添加剂的分子结构特征对水煤浆浆体性质的影响

选用分子结构特征不同的三类共七种添加剂和变质程度不同的八种煤，对添加剂的分子结构特征与煤质及水煤浆浆体各性质间的匹配规律进行研究。结果表明，以多核芳烃为缩聚单体的磺酸盐类添加剂中甲基取代基的引入对煤的成浆性不利，但有利于浆体向塑性流体转变和静态稳定性的提高；苄基取代基的引入能提高分析基氧体积分数低的煤种的成浆性，但是其浆体的静态稳定性较差。富含极性含氧官能团且变质程度较低的煤种在使用磺化程度较高的腐植酸盐类添加剂制浆时，可以制备出较高定黏浓度的水煤浆。腐植酸类添加剂磺化度较高时改善了浆体的流变性。对于腐植酸类和木质素类添加剂，磺化度较高的添加剂有利于挥发分较高的煤种所制浆体的静态稳定性的提高。

Effect of the structural characteristics of anionic additive on the properties of coal water slurry

Ideal coal water slurry(CWS) with maximum coal loading should be relatively stable at static stability and good rheological behavior.Additives have usually been used to improve the slurryability and rheological behavior as well as static stability of CWS to meet requirement of its transportation,storage and combustion in industrial application.The selection of high efficient additives is one of the key steps for preparation of CWS.Therefore,the investigation of the relationships between the properties of CWS and molecular structure of additives plays an important role in selecting high efficient additives.In this paper,7 additives with different structural characteristics and 8 coals are selected to evaluate the correlation between the structural characteristics of additives and the properties of CWS.The results indicate that introducing methyl substitute into the monomer of polynuclear aromatic sulphonate promotes the rheological behavior and the static stability of CWS,but at the same time it is unfavorable for the slurryability of CWS.The presence of benzyl substitute improves the slurryability of CWS prepared with coals of low content of Oad,but it is unfavorable for improving the static stability of CWS.CWS with high coal loading could be prepared by using both low rank coals with a lot of polar oxygen groups and humate additive with high degree of sulphonation.It is also found that additives of humate and lignosulfonate with high degree of sulphonation increase the static stability of CWS prepared by coals with high content of Vdaf.