催化剂颗粒流的基本方程

本文借助于土力学和流体力学等的基本方程,对催化剂颗粒流作了五点假定,建立了封闭的动力学状态方程。为求解移动床以及管内催化剂的高密度重力流动和高密度输送流动等奠定了基础。     

添加剂对含硫镍粉流态化脱硫效果的影响

本文对含硫镍粉进行了脱硫实验研究，研究结果表明：用石英砂作为添加剂对含硫镍粉进行氢还原流态化脱硫是行之有效的。加入一定量的添加剂，可于2～5分钟内将含硫12％左右的镍原矿粉料脱硫至所要求的1．5％以下。     

CFD simulation of fluidization quality in the three-dimensional fluidized bed

Multiphase computational fluid dynamics （CFD） has become an alternative method to experimental investigation for predicting the fluid dynamics in gas-solid fluidized beds. The model of Brandani and Zhang, which contains additional terms in both the gas- and solidphase momentum equations, is employed to explore homogeneous fluidization of Geldart type A particles and bubbling fluidization of Geldart type B particles in three-dimensional gas-fluidized beds. In this model, only a correlation for drag force is necessary to close the governing equations. Two kinds of solids, i.e., fine alumina powder （dp= 60 μm and pp = 1500 kg/m^3） and sand （dp = 610 μm and pp = 2500 kg/m^3）, are numerically simulated in a rectangular duct of 0.2 m （long） × 0.2 m （wide）× 0.5 m （high） size. The results show good agreement with the classic theory of Geldart.     

钛基二氧化铅电极及其在流化床电沉积中的应用

本文描述了钛基二氧化铅电极的基本性质及制作的工艺过程。指出电极的损坏主要有3种形式:脱落、散落、失活,探讨了损坏的机理,并提出了提高电极寿命的方法。作为析氧体系中的不溶性阳极、钛基二氧化铅电极在流化床中进行了应用试验。     

流化床辐射换热机理研究

本文通过对高温流化床内辐射传热特点进行分析,提出了颗粒堆积多层反射模型.径与劣质煤流化床锅炉的实验结果相比较,证明该机理模型能有效地计算大颗粒流化床中的辐射分量.     

不同分布不同种类的粗粒子流化床中气泡的研究

对几种粒度分布宽窄不同、平均粒径近似的粗粒石英砂,以及几种粒度分布较宽的其它粗粒子,在两维床中做了实验研究。本文认为,两相理论对粗大粒子流化床不适用,过余气体不是全部以气泡形式通过床层,文中提出了气泡当量直径沿床高随过余气体流速变化的定量关系式: D_e=(1.11(u—u_(mf))~(2/3))/g~(1/3(h+2.89W_(co))~(2/3)此式与现有的两组数据——本次实验的数据和前人所得的数据,符合都很好。此外,着重讨论了粒度分布对粗粒子流化特性的影响。     

氢还原含硫镍粉流态化脱硫研究

经过对含硫镍粉进行流态公脱硫研究，结果表明：用氢还原流化床对合硫镍粉进行流化脱硫是行之有效的。加入一定量的外加剂，可在２－５分钟内将含硫１２％左右的镍原矿粉料脱硫至所要求的３％以下。     

CFD simulation of fluidization quality in the three-dimensional fluidized bed

Multiphase computational fluid dynamics (CFD) has become an alternative method to experimental investigation on predicting the fluid dynamics in gas-solid fluidized beds. The model of Brandani and Zhang, which contains additional terms in both the gas- and solid-phase momentum equations, is employed to explore homogenous fluidization of Geldart type A particles and bubbling fluidization of Geldart type B particles in three-dimensional gas-fluidized beds. In this model, only a correlation for drag force is necessary to close the governing equations. Two kinds of solids, i.e., fine alumina powder (d_p=60 μm and ρ_p=1500 kg/m³) and sand (d_p=610 μm and ρ_p=2500 kg/m³), are numerically simulated in a rectangular duct of 0.2 m (long) ×0.2 m (wide) ×0.5 m (high). The results show good agreement with the classic theory of Geldart.