| 稻草及木屑与煤二元混合颗粒的流化特性 |
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| 引用本文： | 徐阳,郭志国,陈雪莉,刘海峰.稻草及木屑与煤二元混合颗粒的流化特性[J].医学教育探索,2016(1):1-8. |
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| 作者姓名： | 徐阳 郭志国 陈雪莉 刘海峰 |
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| 作者单位： | 华东理工大学煤气化及能源化工教育部重点实验室, 上海市煤气化工程技术研究中心, 上海 200237,华东理工大学煤气化及能源化工教育部重点实验室, 上海市煤气化工程技术研究中心, 上海 200237,华东理工大学煤气化及能源化工教育部重点实验室, 上海市煤气化工程技术研究中心, 上海 200237,华东理工大学煤气化及能源化工教育部重点实验室, 上海市煤气化工程技术研究中心, 上海 200237 |
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| 基金项目： | 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 |
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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。
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| 关 键 词： | 稻草 木屑 煤 混合颗粒 流化 最小流化速度 |
| 收稿时间： | 2015/7/26 0:00:00 |
Fluidization Behaviours of Sawdust-Straw and Coal Binary Mixed Particles |
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| XU Yang,GUO Zhi-guo,CHEN Xue-li and LIU Hai-feng.Fluidization Behaviours of Sawdust-Straw and Coal Binary Mixed Particles[J].Researches in Medical Education,2016(1):1-8. |
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| Authors: | XU Yang GUO Zhi-guo CHEN Xue-li and LIU Hai-feng |
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| Institution: | Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China,Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China,Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China and Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | 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 biomass 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. |
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| Keywords: | sawdust straw coal mixed particles fluidization minimum fluidization velocity |
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