PDF《离心力场中瘦煤水煤浆的沉降失稳特性》

第43 卷第

8 期煤炭学报Vol.

43 No.

8 2018 年8月JOURNAL OF CHINA COAL SOCIETY Aug.

2018 涂亚楠,王卫东,李峰,等. 离心力场中瘦煤水煤浆的沉降失稳特性[J]. 煤炭学报,2018,43(8):2318-2323. doi:10.

13225 / j. cnki. jccs. 2017.

1611 TU Yanan,WANG Weidong,LI Feng,et al. Sedimentation of lean coal water slurry in centrifugal field[J]. Journal of China Coal Society, 2018,43(8):2318-2323. doi:10.

13225 / j. cnki. jccs. 2017.

1611 离心力场中瘦煤水煤浆的沉降失稳特性 涂亚楠,王卫东,李峰,徐志强,邵帅(中国矿业大学(北京) 化学与环境工程学院,北京 100083) 摘要:将离心加速沉降和 Turbiscan 背散射光稳定性检测技术联合用于水煤浆稳定性分析,研究 了一种瘦煤水煤浆经不同离心转速和离心时间处理后的沉降失稳特性. 研究结果表明,水煤浆在 静置状态下的失稳过程表现出显著的分层特征,而离心状态下主要表现出体系压缩过程而没有显 著分层现象. 但无论是静置还是离心处理,主导水煤浆失稳的核心因素均是颗粒的聚并和体系沉 降. 其中,颗粒的聚并主导了中部沉降区和底部沉淀区的演化过程,而体系的整体沉降则主导了表 层的析水过程. 研究发现,通过分析样品底部

5 mm 区域的稳定性指标可以辨析样品出现软沉淀 的时刻及其演化期,以及硬沉淀开始生成的时间. 这个发现为快速、定量和准确表征水煤浆稳定性 提供了参考. 关键词:水煤浆;

稳定性;

离心;

沉降;

聚并;

颗粒 中图分类号:TQ534 文献标志码:A 文章编号:0253-9993(2018)08-2318-06 收稿日期:2017-11-17 修回日期:2018-04-03 责任编辑:许书阁 基金项目:国家自然科学基金青年基金资助项目(51504261);

国家自然科学基金面上资助项目(51574251) 作者简介:涂亚楠(1984―),男,山东潍坊人,讲师. Tel:010-62339899,E-mail:201315@ cumtb. edu. cn 通讯作者:王卫东(1978―),男,安徽淮北人,副教授. Tel:010-62339899,E-mail:wwd@ cumtb. edu. cn Sedimentation of lean coal water slurry in centrifugal field TU Yanan,WANG Weidong,LI Feng,XU Zhiqiang,SHAO Shuai (School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China) Abstract:A novel method combining centrifugation and backscattering technology was applied to analyze the stability of coal water slurry(CWS). The sedimentation behaviors of CWS prepared with a lean coal treated at different centrifu- gal speeds and centrifugal times were studied. The results indicate that the sedimentation of CWS in standing condition showed a significant delamination characteristic,while in centrifugal condition it mainly showed a system-compression characteristic with no significant delamination phenomenon. However,whether it was in static or centrifugal treatment, the core factors that lead to the CWS instability were particles coalescence and system subsidence. The particles coa- lescence dominated the evolution of CWS instability of the sedimentation area at the middle as well as the settling area at the bottom,while the system subsidence dominated the water liberation at the supernatant. It was found that the sta- bility index at the bottom

5 mm of the sample,whether in the static or centrifugal condition,could be used to identify the occurrence time and the evolution period of the soft deposition,and the time when the hard settling began to gener- ate. This finding provided a valuable reference for the rapid,quantitative and accurate characterization of coal water slurry stability. Key words:coal water slurry;