摘要
在一300×2600mm二维双射流流化床中,采用多路压力信号采集装置,详细研究了射流气速、射流喷口管间距离、静床高度、物性参数对双射流流化床射流流动特性的影响,发现双射流从单独存在到两射流在其射流区内发生射流合并可由压力波动时间序列的功率谱主频和Hurst指数的变化定量确定,结果还表明,双射流流化床管间距减小时,射流在射流区发生合并的射流气速降低;而管间距相同时,静床高变大,射流在射流区发生合并的射流气速也降低;对于相同粒径的固体颗粒,颗粒密度增大使得射流在射流区发生合并的射流气速变大。
With a multi-channel pressure sampling system, a 300×50×2600mm two-dimensional jetting fluidized bed with double nozzles was used to investigate the effects of materials and operating parameters on flow characteristics, eight materials including four binary mixtures were used in this study The influences of jetting velocity, distance between two nozzles, static bed height and the physical properties of materials on jetting flow characteristics of jetting fluidized bed were discussed The experimental results showed that variation of the major frequency and Hurst exponent correspond with jetting gas velocity of coalescence, which means a transition from separating jet to coalescence of jets An empirical correlation is proposed for coalescence velocity, which could predict behavior of double jet colaescence within penetration depth
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1999年第6期535-540,共6页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金! (项目号 2 94762 62 )资助
关键词
双射流流化床
流动特性
煤气化
射流
jetting fluidized bed with double nozzles, nozzle distance, nozzle gas velocity, static bed height, hurst exponent, power spectrum density function
