摘要
提出射流穿透深度是表征喷动流化床煤气化过程中射流特性的重要参数.在300mm×30mm×2000mm的喷动流化床煤气化炉冷态试验装置上,采用压力信号分析和快速摄像图像分析相结合的方法,系统地考察了喷动气速、喷口直径、物料特性、静止床高和流化气流率对射流穿透深度的影响.结果表明,射流穿透深度随喷动气速、喷口直径的增大而增大,随静止床高、物料密度、物料直径、流化气流率的增大而减小.另外,引入两相弗劳德数(Fr)、颗粒雷诺数(Rep)等无量纲参数,对试验结果进行多元回归分析,建立了喷动流化床射流穿透深度的关联式,该关联式全面考虑了各种影响因素,特别是静止床高和流化气流率的影响.关联式的预测值与本文及国内外其他一些研究者的试验值进行了比较,结果吻合得较好.
Jet penetration depth (JPD) is proposed as an important parameter to describe jet action during the chemical process of spout-fluid bed (SFB) coal gasification. A two-dimensional SFB coal gasifier cold model with a dimension of 300 mm × 30 mm × 2000 mm, a multi-channel pressure sampling system and a high resolution digital camera were employed to investigate JPD. Effects of the spouting gas velocity, spout nozzle diameter, static bed height, particle property and fluidizing gas flow rate on JPD have been systematically studied by pressure signal analysis and digital image processing. In addition, two-phase Froude number (Fr), particle Reynolds number (Rep) and other dimensionless parameters were used to develop a new correlation for predicting JPD. Experimental results indicate that JPD increases with increasing spouting gas velocity and spout nozzle diameter, while it decreases with increasing particle density, particle diameter, static bed height and fluidizing gas flow rate. The new correlation presented considers the entire above effects especially static bed height and fluidizing gas flow rate, which is in well agreement with current experimental investigations on SFB and other references to jetting fluidized beds.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第1期29-34,共6页
Journal of Southeast University：Natural Science Edition
基金
国家重点基础研究发展计划(973计划)资助项目(G199902210535)
江苏省高等学校研究生创新计划资助项目(X0428)
东南大学985资助项目
东南大学优秀博士学位论文基金资助项目.
关键词
流态化
喷动流化床
射流穿透深度
射流
Coal gasification
Digital signal processing
Fluidization
Image processing
Reynolds number
