摘要
采用MDMDY-300型全自动密度仪和体积法测量了生物质和3种惰性颗粒的颗粒密度和堆密度,在有机玻璃流化床内考察了生物质单组分及其与3种惰性颗粒双组分体系的最小流化空隙率和流化速度。结果表明,单组分颗粒密度随粒径的变化可以忽略,而堆密度却随粒径的增大有所减小;双组分体系的最小流化空隙率随细颗粒组分增加而出现先减小后增大的趋势,最小值出现在细颗粒组分体积分数为30%左右,且颗粒粒径差异越大变化趋势越明显;双组分体系的起始流化速度、最小流化速度和完全流化速度均随细颗粒组分含量增加呈现减小的趋势,当细颗粒体积分数达到30%左右后起始流化速度的下降趋势趋于平缓。
The particle density and bulk density of biomass and three kinds of inert particles were measured using MDMDY-300 Automatic Density Meter and traditional volume method,respectively.The minimum voidage and minimum fluidization velocity of biomass monocomponent and three inert particles were observed in the plexiglas bed.The results indicate that the monocomponent particle density is almost independent from particle size,while the bulk density reduces with increment of particle size.The minimum voidage decreases when fine particles are introduced and reaches a minimum value at the fine particles of about 30 %（v/v）.The minimum voidage of bi-component system starts to increase with fine particles increasing.Moreover,the greater the difference in particle size,the more obvious this trend.The initial,minimum and full fluidization velocities of bi-component system decrease with increment of the volume fraction of fine particle.It is similar to the minimum voidage,the minimum fluidization velocity decreases slowly when the volume fraction of fine particles is more than 30 % or so.
出处
《生物质化学工程》
CAS
2011年第1期15-20,共6页
Biomass Chemical Engineering
基金
国家自然科学基金资助(20976191)
"十一五"国家科技支撑计划资助(2006BAD07A03)
教育部新世纪人才支持计划资助(09-0342)
关键词
生物质
惰性颗粒
双组分体系
流化特性
biomass
inert particles
bicomponent system
fluidization characteristics
