摘要
选择了大同、兖州、红会、八一及神木等五种煤样(其浆体流变特性呈胀性流体、静态稳定性较差)。系统地考察了超声处理时间及超声强度对各煤浆浆体的流变特性、静态稳定性以及成浆性的影响。实验结果表明,在一定的超声条件下(超声处理时间2~10min、超声强度40W/cm2~80W/cm2、超声频率20kHz),随着超声处理时间和超声强度的增加,五种煤的浆体都由胀性行为向屈服假塑性方向转化,浆体静态稳定性由几h可以提高到一个月!另一方面,添加剂的浓度为1%时(按干基煤含量计),超声处理导致各浆体表观粘度略有上升。粒度分析结果表明,超声处理使得细煤粒的比例明显增加,超声引起浆体性质变化的原因至少部分是由于粒度分布的变化所致。
The effect of ultrasonic treatment on the properties of coal water slurry (CWS), such as slurryability, rheological behavior and static stability, were investigated The ultrasonic intensity was varied from 40W/cm2 to 80W/cm2 and treatment time from 2 to 10 min Ultrasonic treatment markedly improved both rheological behavior and static stability of CWS, but it caused a slight increase in the apparent viscosity of CWS The analysis of coal particle size distribtuion indicated that ultrasonic treatment resulted in a higher proportion of fine coal which benefits to improve the rheological behavior and static stability of CWS
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1998年第2期125-129,共5页
Journal of Fuel Chemistry and Technology
基金
国家教委资助优秀年轻教师基金
宁夏教委高校科研基金
关键词
超声处理
水煤浆
流变性
稳定性
浆体性质
ultrasonic treatment,coal water slurry,rheological behavior,static stability