首钢烧结配加扬地粉试验研究

介绍了首钢原料条件下配加扬地粉对烧结生产影响的实验室研究.随着扬地粉配入量的增加,烧结矿转鼓强度、成品率改善,燃耗有少量上升,利用系数增加,低温还原粉化指数变差.研究结果表明:在首钢目前条件下,配入10%～20%的扬地粉是可行的.二烧车间进行了扬地粉工业试验,其最高配比达到30%,工业试验时烧结各项指标变化与实验室试验结果基本一致.     

新型钻井钢丝绳卷绳器的设计与应用

针对各油田用卷绳入卷筒和液压卷绳器存在劳动强度大、费工费时、效率低下以及液压油路易出现漏油和性能不够稳定等缺点,设计了新型钻井钢丝绳卷绳器。这种卷绳器使用减速电动机作动力,通过联轴器联接驱动大、小两根轴。大小卷筒均为空套卷筒,3个卷筒可以通过各自的离合器、刹车装置分别控制。大卷筒用来缠绕大绳,2个小卷筒用于缠绕穿大绳的引导小绳。20个井队现场使用表明,以前需要十几人6～7 h才能完成的工作,采用新型卷绳器后只需3人1h即可完成,且操作方便,使用灵活,没有污染。     

Ozonation of CI Reactive Black 5 using rotating packed bed and stirred tank reactor

This study investigates the ozonation of CI Reactive Black 5 (RB5) by using the rotating packed bed (RPB) and completely stirred tank reactor (CSTR) as ozone contactors. The RPB, which provides high gravitational force by adjusting the rotational speed, was employed as a novel ozone contactor. The same ozone dosage was separately introduced into either the RPB or the CSTR for the investigation, while the experimental solution was continuously circulated within the apparatus consisting of the RPB and CSTR. The decolorization and mineralization efficiencies of RB5 in the course of ozonation are compared for these two methods. Moreover, the dissolved and off‐gas ozone concentrations were simultaneously monitored for the further analysis. As a result, the ozone mass transfer rate per unit volume of the RPB was significantly higher because of its higher mass transfer coefficient and gas–liquid concentration driving force. Furthermore, ozonation kinetics was found to be independent of the gravitational magnitude of an ozone gas–liquid contactor. Therefore, the results suggest employing RPBs as ozone‐contacting devices with the advantage of volume reduction. The experimental results, which can be used for further modeling of the ozonation process in the RPB, also show the requirement of correct design for the RPB. Consequently, the present study is useful for the understanding of practical application of RPBs. Copyright © 2004 Society of Chemical Industry     

Comparison of mass transfer efficiency in horizontal rotating packed beds and rotating biological contactors

In this study, the mass transfer efficiencies of a novel horizontal rotating packed (h‐RPB) bed and the conventional disc‐type rotating biological contactor (RBC) were studied at four speeds and seven submergences. Pall rings of two different sizes (25, 38 mm), superintalox saddles and a wiremesh spiral bundle were used as packings in the h‐RPB. Volumetric gas–liquid mass transfer coefficients were determined by unsteady state absorption of atmospheric oxygen in de‐aerated water. Power consumption per unit liquid volume has been found for all geometries tested. The oxygen transfer efficiency values for the h‐RPB were found to be 2–5 kg kWh^?1 and for the disc RBC were found to be 1–2 kg kWh^?1. The performance of the h‐RPB was also compared with other gas–liquid contactors such as surface aerators. The study proves that the h‐RPB is a energy efficient alternative to conventional contactors. Copyright © 2005 Society of Chemical Industry     

Fourth-Order Semi-Compact Scheme for Flow Past a Rotating and Translating Cylinder

In the present investigation, the newly developed Higher Order Semi-Compact (HOSC) finite difference scheme has been tested for its capability in capturing the very complex flow phenomenon of unsteady flow past a rotating and translating circular cylinder. The physical problem has been modeled in stream function and vorticity formulation and the obtained governing equations are transformed into curvilinear coordinates using body fitted coordinate system to enable the developed scheme to handle the non-rectangular geometry of the problem. Qualitative and quantitative comparisons have been done at low-rotation parameters and found that the results obtained are in excellent agreement with the existing literature. Then simulations have been carried out at high-rotation parameters and noticed that the HOSC scheme is able to simulate some of the flow features known experimentally but not simulated numerically to the present date.     

回转窑窑体变形的一种实时监测与报警系统

针对回转窑在运行过程中窑体变形的情况开发了一种监测与报警系统。完成了系统的前向通道设计、单片机与PC机的串行通讯设计和报警显示。     

钻机绞车滚筒体的窄间隙埋弧焊

针对钻机绞车滚筒体采用手工电弧焊工人劳动强度大、焊接效率低、质量不稳定及返修率高等问题,研制了钻机绞车滚筒体窄间隙埋弧焊专机。该专机由ESAB—A2埋弧焊电源和焊接小车、窄间隙焊头、滚轮架、防窜装置、旋转地线夹、三维焊接工作台、焊剂自动回收机组成。使用表明,采用该焊机焊接的滚筒体焊缝质量完全符合设计要求,合格率100%,焊接效率比原来提高6倍。每件滚筒体的焊接可降低人工成本约80%。     

NaSCN装置脫色釜H_2S爆燃的原因分析与对策

分析了NaSCN装置脱色釜爆燃的原因,找出了引起爆燃的主要因素,提出了脱色生产安全防范措施。     

THE FLOW PRODUCED IN PARTICLE-SUSPENSION BY AN INFINITE ROTATING DISK:SERIES SOLUTION

To the flow produced in particle-suspension by a rotating disk of infinite extent,the asymptotic behavior at infinity is analyzed.A corresponding series solution is presented.It isshown that this approach yields widely valid solutions of high accuracy for all the cases in whichthat suction or weak injection at the disk surface exists.For the cases that strong injection or par-ticle-free band exists,the series method fails.     

代数应力模式的分析解及其在充分发展旋转管流中的应用

本文通过求解雷诺应力在代数应力模式中与平均速度梯度之间的分析关系，研究了代数应力模式在涡旋流动特别是在充分发展旋转管流中存在的内在缺陷，这些缺陷的主要表现为：（１）在不考虑固壁对湍流影响的代数应力模式中，分析解给出Ｗ∝ｒ和ｖｗ＝０的错误结论；（２）若在代数应力模式中考虑固壁对湍流影响，在对称轴上会有ｖ＾２不等于ｗ＾２的非物理解。与诺应力输运模式相比，代数应力模式的缺陷归限结底在于该模式的基本假设不