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稻草及木屑与煤二元混合颗粒的流化特性 被引量:6

Fluidization Behaviours of Sawdust-Straw and Coal Binary Mixed Particles
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摘要 为获得生物质与煤混合颗粒的最小流化速度(Umf)与混合颗粒流化时的分离特性,借助高速摄像仪、压力在线采集系统等对稻草及木屑两种生物质与煤二元混合颗粒的流化特性进行了研究。当生物质掺混比(质量分数)低于5%时,二元混合颗粒的流化性能与煤粉单独流化接近,甚至在一定程度上提高了流化质量;但随着生物质颗粒与煤颗粒的粒径差异增大以及生物质掺混比增大到10%左右,二元混合颗粒流化质量变差,逐渐出现分离和穿孔等现象。随着混合颗粒中生物质掺混比的增大,最小流化速度随之增加。基于实验研究结果,提出了用于预测生物质与煤二元混合颗粒最小流化速度的改进模型。另外研究还表明随着生物质掺混比的增大,混合颗粒离析程度加剧,床层出现不稳定流化现象。 This paper aimed to study the fluidization and segregation behaviours of sawdust-straw and coal binary mixed particles during fluidization using the high-speed camera and online pressure acquisition system,further to propose an improved model to predict the related minimum fluidization velocity (Umf). Adding a small amount of biomass particles (mass fraction below 5%) could optimize the fluidization's characteristic. However, improper fluidization (segregation and channeling) occured when mass fraction was near 10% for rough particles. With an increase of hiomass mass fraction, the declined pressure drop and the enlarged Umf are obtained. In addition, the research also shows that as the mass mixing ratio of biomass grows, the segregation degree of mixed particles rises,and the fluidization becomes unstable.
出处 《华东理工大学学报(自然科学版)》 CAS CSCD 北大核心 2016年第1期1-8,共8页 Journal of East China University of Science and Technology
基金 新世纪优秀人才支持计划(NCET-12-0854) 国家自然科学基金(21306050) 中央高校基本科研业务费专项资金
关键词 稻草 木屑 混合颗粒 流化 最小流化速度 sawdust straw coal mixed particles fluidization minimum fluidization velocity
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参考文献27

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