低阶煤高温高压水热处理改性及其成浆特性  

Hot water treatment of low rank coal in high temperature and high pressure reactor and its slurry ability

作　　者：赵卫东[1] 刘建忠[1] 周俊虎[1] 曹晓哲[1] 张光学[1] 岑可法[1] 

机构地区：[1]能源清洁利用国家重点实验室(浙江大学),浙江杭州310027

出　　处：《化工学报》2009年第6期1560-1567,共8页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2004CB217701)~~

摘　　要：The coal water slurry(CWS) prepared from low rank coals(LRC),such as lignite or subbituminous coals always has a higher viscosity and poor fluidity while the solid concentration is smaller than high rank coal water slurry.The reason is there are larger inherent moisture and oxygen composition in LRC.Under high temperature and high pressure conditions,LRC was upgraded in hot water in a short time period of an hour.The heating value of LRC was also increased in such a process,and the physical and chemical characteristics of LRC changed meanwhile to improve its slurry ability which meant a higher solid concentration with a lower viscosity.The results showed that after hot water treatments,the maximum solid concentration of Xiaolongtan CWS increased from 44.6% to 64.55%,while that of MIP CWS increased from 39.71% to 64.61%.The improvement of LRC slurry ability depended much on the final temperature of hot water treatments.The mechanism was explained by the chemical analysis of oxygen-containing groups and the measurement of contact angle between coal surface and water.The coal water slurry （CWS） prepared from low rank coals （LRC）, such as lignite or subbituminous coals always has a higher viscosity and poor fluidity while the solid concentration is smaller than high rank coal water slurry. The reason is there are larger inherent moisture and oxygen composition in LRC. Under high temperature and high pressure conditions, LRC was upgraded in hot water in a short time period of an hour. The heating value of LRC was also increased in such a process, and the physical and chemical characteristics of LRC changed meanwhile to improve its slurry ability which meant a higher solid concentration with a lower viscosity. The results showed that after hot water treatments, the maximum solid concentration of Xiaolongtan CWS increased from 44. 6% to 64. 55%, while that of MIP CWS increased from 39.71% to 64.61%. The improvement of LRC slurry ability depended much on the final temperature of hot water treatments. The mechanism was explained by the chemical analysis of oxygen- containing groups and the measurement of contact angle between coal surface and water.

关 键 词：低阶煤 水煤浆 水热处理 含氧基团 接触角 

分 类 号：TQ536.9[化学工程—煤化学工程]