摘要
使用12种不同分散剂对14种不同变质程度的煤进行了成浆性实验,分析了182个水煤浆(CWS)样品的流变性。结果表明,低变质程度和高灰煤浆多呈屈服假塑性,煤的性质起主导作用;变质程度高且灰分较低煤浆的流变性,主要依赖于分散剂的结构与性质;分子结构单元立体空间效应大,疏水基团与亲水基团呈立体间隔分布的分散剂,易形成屈服假塑性CWS;分子线度长,亲水基团与疏水基团呈线性间隔分布的分散剂,易形成胀塑性CWS。复合煤粒间的相互作用方式是决定CWS流变特性的关键。
The rheological behavior of 182 CWS samples was studied using 14 Chinese coals with 12 dispersants. The results show that the CWS rheology of low rank or high ash coal is mainly due to the physical and chemical properties as well as surface structure characteristics of coal. The CWS rheology of high rank coal depends mainly on the structure and property of the dispersants. Generally, when the molecular structure unit of dispersant has large space effect, its hydrophilic and hydrophobic groups are space alternate distribution, it results easily in CWS to exhibit pseudo-plastic behavior. When the dispersant is a length chain polymer, its hydrophilic and hydrophobic groups are linear alternate distribution, it results easily in CWS to exhibit dilatant behavior. Furthermore, the effect of interaction among complex coal particles on CWS rheological behavior has been discussed.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2003年第6期519-524,共6页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(50074033)~~
