搜索结果: 46-60 共查到“知识库 颗粒学”相关记录90条 . 查询时间(4.636 秒)
针对催化汽油辅助反应器改质降烯烃工艺，在一套提升管-流化床耦合反应器大型冷态实验装置上，系统研究了提升管出口段的颗粒流动特性，通过定义约束指数Ri（Ri为颗粒约束返混区实际截面平均固含率与理论截面平均固含率之比）定量反映提升管出口分布器及流化床层的约束作用。结果表明，与常规提升管相比，耦合反应器提升管出口存在一个颗粒约束返混区，其长度主要受表观气速、颗粒循环强度及上部流化床内颗粒静床高度影响;由于...
稀疏两相射流中颗粒碰撞的数值研究
硬球模型 直接数值模拟 稀疏气固两相流
2009/6/5
为了研究稀疏气固两相流动中颗粒间的碰撞行为及其对颗粒扩散的影响，对三维两相湍流射流进行了直接数值模拟。其中对流场控制方程的求解采用有限容积法和分步投影算法，对颗粒的跟踪采用拉格朗日方法，对颗粒间的碰撞采用硬球模型模拟。结果发现，在流场中局部浓度较高的区域颗粒碰撞频繁发生;受局部富集效应和湍流输运作用两方面的影响，颗粒的平均碰撞次数并不是随着Stokes数的增加呈现简单的线性增加，而是在Stokes...
洗涤塔脱除燃烧源超细颗粒的实验研究
颗粒 洗涤塔
2009/6/5
在填料洗涤塔中进行了利用蒸汽相变原理促进燃煤和燃油超细颗粒凝结长大并高效脱除的实验研究;采用电称低压冲击器(ELPI)、SEM及XPS对两种燃烧源细颗粒凝结洗涤前后的数浓度、粒径分布、形貌和元素组分进行了分析测试，考察了洗涤塔进口气液温差、进口烟气含湿量及液气比等对脱除效率的影响。结果表明，燃煤和燃油产生的超细颗粒形貌和组分具有较大的差别，燃煤超细颗粒主要为硅铝矿物质，而燃油超细颗粒主要为含炭物质...
采用转相法制备了阴离子聚丙烯酸羟基树脂包覆HDI缩二脲乳胶粒.用TEM观察了包覆乳胶粒形态结构，分析了影响包覆乳胶粒粒径的影响因素.结果表明，乳胶粒呈现明显的核-壳结构，HDI缩二脲被聚丙烯酸羟基树脂包覆.聚丙烯酸羟基树脂分子量越大、溶剂极性越强，乳胶粒粒径越小.增加苯乙烯用量，乳胶粒粒径随之先减小后增加，苯乙烯质量分数为10%时粒径最小.乳胶粒粒径随羟基含量的增加而增大.当羟值为60 mg KO...
SBR好氧污泥颗粒的脱氮性能研究
污泥处理 好氧污泥颗粒 脱氮性能 SBR
2009/3/23
The sequencing batch reactor （SBR） was started up by seeding the anaerobic granular sludge and the aerobic granular sludge was successfully cultivated. The performance characteristic of the aerobic gr...
超临界反溶剂过程制备槲皮素超细颗粒
栎精 类黄酮 超临界体
2009/3/13
Supercritical antisolvent (SAS) process is a recently developed technology to produce micro- and nanoparticles. This paper presents a continuous apparatus to conduct experiment of SAS process. With th...
超临界流体重结晶制备HMX微细颗粒和结晶速率的研究
supercritical carbon dioxide microparticle recrystallization rate
2009/3/13
Microparticle formation and crystallization rate of 1,3,5,7-tetranitro-1,3,5,7- tetraazacyclooctane (HMX) in acetone solution using supercritical carbon dioxide antisolvent (GAS) recrystallization we...
The formation of BaTiO3 nanoparticles via the reaction of BaCl2, TiCl4 and NaOH in aqueous solution has been systematically studied. The formation of BaTiO3 from the ionic precursors has been elucidat...
PCL/PMVS共混物的辐射交联行为与性能
PCL/PMVS共混物 辐射交联 性能
2009/3/11
测量了PCL/PMVS共混物的凝胶含量、力学性能和形状记忆行为,研究了聚己内酯(PCL)与甲基乙烯基硅橡胶(PMVS)共混物的辐射交联行为.研究表明,PCL/PMVS共混物的辐射交联符合Charlesby-Pinner关系式,且PMVS对PCL的辐射交联有促进作用.随着共混物中硅橡胶用量的增加,凝胶化剂量降低,裂解与交联几率的比值p0/q0比值变小,辐射交联效率提高.共混物的拉伸强度和断裂伸长率随...
Chemical modification (CM) and deposition-precipitation (DP) methods were used for the dispersion of active Au nanoparticles on mesoporous silica materials in this work. XRD, TEM, N2 adsorption isot...
The discrete particle method was used to simulate the distribution of gas holdup in a gas-liquid standard Rushton stirred tank. The gas phase was treated as a large number of bubbles and their traject...
The minimum fluid velocity to maintain particles just suspended was deduced, and the theoretical analysis shows that the minimum velocity is influenced by the properties of the solid and liquid, not...
浆料系统内上升气泡周围微细颗粒浓度分布和附着效率的理论研究
Brownian diffusivity distribution function Fokker-Planck equation
2009/3/6
Quantitative prediction of distribution function and adhesion efficiency of particles around a risingbubble in slurry systems is presented in this work. By solving the convection-diffusion equation ...
宽筛分硅粉颗粒的流化特性
宽筛分 硅粉颗粒 流化特性
2009/3/6
Fluidization characteristics of silicon particle system are studied by the pressure fluctuation method.The existence of fine particles in the system canimprove fluidization. Silicon particles with a w...