摘要
采用热重-差热分析法,研究了水煤浆中水分分布特征.通过水煤浆脱水率、Zeta电位、粒径、动态稳定性和黏度等指标的对比分析,研究了聚合氯化铝(PAC)调节水煤浆脱水性能以及错流过滤实现水煤浆浓缩的可行性,对比研究了平纹丙纶滤布与土工布过滤分离的性能.结果表明,添加PAC可以增加水煤浆中自由水的质量分数,显著提高水煤浆的脱水速率.添加0.01%(质量分数)的PAC,可以同时满足动态稳定性、黏度和脱水速率等要求;实验设计的错流过滤装置,能快速将水煤浆的质量分数由52%提升至65%以上,平纹丙纶滤布的水透过通量与煤水分离效果优于土工布.
The moisture distribution of CWS was analyzed by TG-DSC before and after polyaluminium chloride（PAC）adjustment,the effects of PAC dosage on the dewatering performance of coal-water slurry and the feasibility of cross-flow filtration were conducted,PAC adjustment mechanism was discussed according with several indexes such as dewatering rate,Zeta potential,particles potential,size,dynamic stability and slurry viscosity.The filtration performance of tabby polypropylene fabric and geotextile were compared with the membrane flux and pressure change.The results revealed that PAC can significantly increase the dewatering rate of coal water slurry;0.01%（mass fraction）PAC can meet the requirements of dynamic stability,viscosity and dewatering rate for long-distance pipeline transport and finally gasification device.The cross-flow filtration device can quickly improve the concentration of CWS from 52%to 65%,and the effect of plain polypropylene fabric＇s filtration rate and turbidity were better than that of geotextile.
出处
《煤炭转化》
CAS
CSCD
北大核心
2016年第4期46-50,55,共6页
Coal Conversion
