85m直径熟料库钢网架屋盖设计与实现

基于85 m直径熟料库钢屋盖设计和施工,本文阐述了一种大跨度熟料库钢屋盖网架的设计思路,底部数环采用三层网架的型式(加强圈)减小环向杆件的螺栓直径,避免了大直径螺栓难以拧进、焊接球网架动火施工的问题;同时,本文阐述了网架杆件送样检测过程、棱台面网架主要的施工步骤,可供行业同仁参考交流。     

新型立磨的结构特点及其关键部件安装方法

东方希望5000t/d水泥熟料线原料粉磨采用了2009年获得发明授权的新型立磨。简要论述了该新型立磨与传统立磨的结构区别及传动特点;在此基础上详细介绍了该新型立磨关键部件——静压轴承系统、大齿圈、减速机和电机等的安装方法及调整措施。     

聚乙烯格网阻风、消泡的研究与应用

当废水中有表面活性剂成分时,通常采用消泡剂消除好氧曝气池液面聚集的泡沫,但消泡效果差,同时会增加成本和污染物的量。试验发现超小尺寸格网具有阻风、割裂泡沫的功能,采用超小尺寸格网覆盖好氧曝气池池面,能够彻底解决泡沫乱飞的危害,每年可节省消泡剂费用70万元,人工成本20万元,生化出水CODCr的质量浓度比投加消泡剂时下降15～25 mg/L,而且易于管理。     

On MHD heat and mass transfer over a moving vertical plate with a convective surface boundary condition

In this paper, the magnetohydrodynamics (MHD) boundary layer flow with heat and mass transfer over a moving vertical plate in the presence of magnetic field and a convective heat exchange at the surface with the surrounding has been studied. The similarity solution is used to transform the system of partial differential equations, describing the problem under consideration, into a boundary value problem of coupled ordinary differential equations, and an efficient numerical technique is implemented to solve the reduced system. The results are presented graphically and the conclusion is drawn that the flow field and other quantities of physical interest are significantly influenced by these parameters.     

PDA微机三维配管工程设计软件的应用与体会

介绍PDA三维配管设计软件的功能特点 ;结合硝酸尾气治理项目工程设计中使用的体会 ,对PDA软件提出了改进建议。     

立式热虹吸再沸器设计及核算软件开发

在查阅和分析国内外大量立式热虹吸再沸器资料的基础上,传承再沸器的各种设计方法,并用具体的工业生产实例进行考核。最终,编制出通用于各种工艺工况,便于进行立式热虹吸再沸器设计的软件,为编制开发出统一应用于各种工艺条件下热虹吸再沸器的设计软件包成为可能。     

Combined effects of internal heat generation and buoyancy force on boundary layer flow over a vertical plate with a convective surface boundary condition

This paper considers the effect of buoyancy force and internal heat generation on laminar thermal boundary layer over a vertical plate with a convective surface boundary condition. We assumed that left surface of the plate is in contact with a hot fluid while a stream of cold fluid flows steadily over the right surface with a heat source that decays exponentially. Using a similarity variable, the steady state governing non‐linear partial differential equations have been transformed into a set of coupled non‐linear ordinary differential equations, which are solved numerically by applying shooting iteration technique together with fourth order Runge–Kutta integration scheme. The effects of Prandtl number, local Biot number, the internal heat generation parameter and the local Grashof number on the velocity and temperature profiles are illustrated and interpreted in physical terms. A comparison with previously published results on special case of the problem shows excellent agreement. From our results, an overshoot of fluid velocity within the boundary layer is observed due to combined effect of buoyancy force and internal heat generation, in addition, internal heat generation causes thickening of thermal boundary layer. © 2011 Canadian Society for Chemical Engineering     

沙特CCC二期石灰石预均化堆场网架基础设计与优化

在设计沙特CCC二期373m×59m长形石灰石预均化堆场时,基于现场施工场地和降低工程成本因素,对堆场网架基础进行了设计优化,通过改变网架的支座型式(由一期的双支座改为二期的单支座),并对荷载重新进行组合,以优化基础设计,从而减少了材料用量,并确保了工程的施工组织和高效实施。     

POD analysis of oscillating grid turbulence in water and shear thinning polymer solution

Oscillating grids are frequently used with water and Newtonian fluids to generate controlled turbulence and mixing. Yet, their use with shear thinning fluids still requires experimental characterization. Proper orthogonal decomposition (POD) is applied to PIV measurements of the flow generated by an oscillating grid in water and a shear thinning dilute polymer solution (DPS) of xanthan gum. The aims are to investigate the ability of POD to isolate periodic flow structures, and to use it to describe the effects of the shear thinning property. A dominance of the low order POD modes is evidenced in DPS. The methods applied in blade stirred tanks to identify oscillatory motion fail here. However, a strong mode coupling in the grid swept region is observed, determined by the working fluid and by an underlying chaotic nature of the flow. Possibilities of reconstructing turbulence properties using high order modes are discussed.