水泵密封的改造与使用

随着企业对生产过程高连续性的要求越来越高及企业维修周期越来越长的要求。对生产装置的运行可靠性也就越来越高。而作为普通水泵的盘根密封系统存在的泄漏、使用寿命短、能耗大等问题就不能为企业所接受。水泵的密封系统所出现的泄漏已成为影响设备正常运转的最大问题之一。无填料密封或新型层状剪切式填料密封效果较好，在节能降耗、延长检修周期方面都有较显著的成效，而且无填料密封技术在我厂研究攻关多年，已积累了一定的经验。应用无填料密封技术改造后，预计主要产生的经济效益为节电效益；由于改造后密封良好，消除了泄漏。从而改善了现场环境；解决了泵两端轴承体内润滑油脂的溅水乳化问题。延长了轴承的使用寿命。降低了泵的维修次数；能够降低检修成本和维修工作量。     

水泵密封在线修复技术-注入式软填料密封的原理及应用

分析了水泵密封泄漏的危害和传统密封存在的问题，介绍了水泵密封在线维修技术，彻底解决水泵端的密封问题。     

悬臂式离心风机轴承箱密封的改造

本分析了风机轴承箱在密封方式及结构上存在的问题,提出了对轴承箱进行结构改造,并采用新的密封方式,使泄漏问题最终得到解决。     

离心式空压机密封失效故障分析与改进

RIKT型离心式压缩机在大修后出现油箱内正压、电机轴承箱及压缩机后轴承回油管路大量漏油,导致机组无法正常运行.经分析,发现前轴承箱密封系统失效,压缩空气通过前轴承气封、油封泄漏到润滑系统是导致油箱负压环境破坏、各润滑点漏油的直接原因.通过改造压缩机前轴承箱密封结构,成功解决气封漏气故障.     

高炉冲渣系统技术改造

随着高炉出渣量的增加,浮渣在冲渣系统水泵入口处沉积,致使冲渣水泵的流量减小,影响高炉冲渣系统的正常运行。对高炉冲渣系统进行技术改造,在水泵入口处管道增加连通,冲渣水主管道增设泄压阀,应用了变频技术。改造后的冲渣系统投入运行后,各项设备均运转正常,降低了设备故障率和工人劳动强度,节约了电能,降低了生产成本,取得了较高的经济效益。     

浅析火力发电厂凝结水泵变频节能改造

对某电力公司1#机组凝结水泵变频节能技术改造前后的电流、功率及节能情况进行了对比分析,详细介绍了凝结水泵变频改造的调试方案。凝结水泵变频改造后取得了较好的节电效果。     

高炉冲渣泵的变频调速节能

根据高炉冲渣水泵的工艺运行特点 ,提出利用变频调速器对冲渣泵进行节能技术改造方案 ,对方案进行了可行性分析 ,并对改造后经济效益进行了分析 ,不仅满足冲渣工艺要求 ,而且取得了年节约 4 6.63万元的经济效益     

高炉热风阀法兰带压密封夹具的设计与应用

针对天钢3 200 m3高炉热风阀法兰出现的突发泄漏的现象,为了确保热风阀法兰泄漏部位带压密封的可靠性,根据现场的工况及阀门的结构特点设计制作出一套带压密封夹具,给出了密封夹具的施工方法以及带压密封封堵操作程序,取得了很好的带压密封效果,节约了检修时间,减少了停产损失.     

Φ980×1600铸轧机列卷取机的技术改造

本从理论和实践的结合上对铸轧机卷取机技术改造进行全面讨论，取得了改造的成功。解决了设备的泄漏问题，节约了原辅材料，提高了设备运转率。     

韶钢5号烧结机扩容改造及效果

介绍了韶钢炼铁部5号烧结机(360 m2)扩容改造的情况及其生产效果.此次扩容改造主要包括:台车加宽0.5m,机尾增加一个1.5m长的风箱,料层提高50 mm,以及相应的配套设施改造;同时更换了机头、机尾密封装置.改造后,有效烧结面积增加51 m2,全年可提高产量约80万t,节约成本达1.4亿元,效果显著.     

一次除尘风机稀油润滑系统的改进

通过更换供油泵和增加一个低位油箱,解决了在低转速下风机轴瓦和耦合器轴承的润滑问题,也杜绝了风机轴瓦漏油现象,确保了风机的正常运行。通过更换大容积高位事故油箱,为事故和故障的处理创造了条件,有效的防止了恶性事故的发生。     

Efficacy of Genetic Algorithm to Investigate Small Scale Aquitard Leakage

The movement of water from a shallow aquifer to a semiconfined aquifer through a localized area of leakage in an aquitard, designated as an aquitard window, is an area of concern in certain gulf coastal plain aquifer settings. Locating these windows, or areas of leakage, has been historically arduous. The purpose of this study was to evaluate the use of a genetic algorithm (GA) technique as an inverse technique for locating highly probable areas of leakage based upon aquifer head data near the suspected area of leakage. The GA technique has previously been tested on synthetic data alone, and this research offers insight into the capabilities of the technique with actual field data from a site with a known aquitard window. Research sites with historical and ongoing data collection efforts are rare and offer the best opportunity for robust evaluation of new methodologies. Based upon the GA technique, the steady-state accretion flux to the Memphis aquifer at the Shelby Farms study site was determined to be 12,346 m3/day with a standard deviation of 821 m3/day and compared well with the range from 510 to 9,911 m3/day previously determined for the site.     

汽车大梁用钢WL510连续冷却过程的相变和组织

通过Thermecmastor-Z热模拟试验机研究了WL510钢(/%:0.090C、0.13Si、1.45Mn、0.005S、0.019P、0.040Al、0.020Ti、0.030Nb)粗轧后板坯(36 mm×1 500 mm)在1～36℃/s连续冷却条件下的相变和组织的变化,并用热膨胀法测定了试验钢连续冷却转变(CCT)曲线。结果表明,试验钢WL510在1～23℃/s低冷却速度下,主要形成多边形铁素体和少量珠光体;当冷却速度≥30℃/s时,主要组织为细针状铁素体、少量细珠光体和岛状马氏体/奥氏体(M/A)随着冷却速度的增加,试验钢组织明显变细。     

Clinical evaluation of the HeartPak. A new pneumatic portable driver for use with the HeartMate Implantable Pneumatic Left Ventricular Assist System

The HeartPak Portable Pneumatic Driver was designed for use with the HeartMate Implantable Pneumatic Left Ventricular Assist Device (IP-LVAS) (Thermo Cardiosystems, Inc., Woburn, MA). The HeartPak measures 48 x 23 x 15 cm, weighs 9.3 kg with batteries, and can be carried by a handle, by a shoulder strap, or on a trolley. Four 12 V batteries provide power for as long as 8 hr. To test the HeartPak in the hospital environment, seven men were studied who were bridge-to-transplant patients (mean age, 59.8 +/- 8.87 years) undergoing HeartMate IP-LVAS therapy. They were supported by the HeartPak for 429 days with a cycle count of 57,826,560. To normalize the mean pump flow rate, we used the body surface area to obtain a pump flow index in each case. The mean flow rate was 2.65 +/- 0.57 L/min/m2 for the HeartPak vs. 2.64 +/- 0.45 L/min/m2 for the HeartMate 1000, the conventional driver previously used in these patients. The only potentially serious problem with the HeartPak was console failure in one case. The patient took appropriate backup measures, and the HeartPak was replaced. In no case did the device cause any adverse effects or interruption of LVAS support. Compared with HeartMate 1000, the HeartPak was more convenient, easier to operate, and allowed better patient mobility.     

An implantable centrifugal blood pump for long term circulatory support

A compact centrifugal blood pump was developed as an implantable left ventricular assist system. The impeller diameter is 40 mm and the pump dimensions are 55 x 64 mm. This first prototype was fabricated from titanium alloy, resulting in a pump weight of 400 g including a brushless DC motor. Weight of the second prototype pump was reduced to 280 g. The entire blood contacting surface is coated with diamond like carbon to improve blood compatibility. Flow rates of over 7 L/min against 100 mmHg pressure at 2,500 rpm with 9 W total power consumption have been measured. A newly designed mechanical seal with a recirculating purge system ("Cool-Seal") is used as a shaft seal. In this seal system, seal temperature is kept under 40 degrees C to prevent heat denaturation of blood proteins. Purge fluid also cools the pump motor coil and journal bearing. The purge fluid is continuously purified and sterilized by an ultrafiltration filter incorporated into the paracorporeal drive console. In vitro experiments with bovine blood demonstrated an acceptably low hemolysis rate (normalized index of hemolysis = 0.005 +/- 0.002 g/100 L). In vivo experiments are currently ongoing using calves. Via left thoracotomy, left ventricular apex-descending aorta bypass was performed utilizing a PTFE (Polytetrafluoroethylene) vascular graft, with the pump placed in the left thoracic cavity. In two in vivo experiments, pump flow rate was maintained at 5-8 L/min, and pump power consumption remained stable at 9-10 W. All plasma free hemoglobin levels were measured at < 15 mg/dl. The seal system has demonstrated good seal capability with negligible purge fluid consumption (< 0.5 ml/ day). Both animals remain under observation after 162 and 91 days of continuous pump function.     

莱钢2#750m3高炉软水循环泵改造

为了满足高炉增加循环水量的要求,运用射流——尾迹三元流水泵叶轮设计方法对莱钢2^#750m^3高炉软水循环泵进行改造。改造后,2^#750m^3高炉炉体的循环流量达到1230m^3／h,扬程60m,冷却强度提高,冷却壁寿命延长了2年,提高了系统运行的安全性,年节电效益13万元。     

New design for a pumping artificial lung

A new prototype of a pumping artificial lung (PAL) has been designed and tested. The device performs the functions of both the pump and oxygenator components of an extracorporeal perfusion circuit. Previous prototypes that the authors developed (Type A) had gas exchanging microporous fibers formed into propeller-like vanes that, upon rotation, pump the blood. The design of the new PAL prototypes (Type B) uses the rotation of an annular bank of fibers to drive flow. The fiber bank, including sealed gas manifolds, lies within the housing of a modified Bio-Medicus BMP-50 pump head (Bio-Medicus, Eden Prairie, MN). Rotation of the fiber bank is driven through a magnetic coupling. Inlet and outlet gas lines enter the pump head through a sealed bearing. The Type A PAL suffered from insufficient pumping rates and gas exchange, necessitating redesign. The authors have constructed two PAL-B prototypes with a priming volume of only 140 ml and gas exchange surface areas of 0.16 and 0.60 m2. During in vitro saline testing, these prototypes showed significant pump performance, pumping 7.0 L/min against zero head at 3,500 rpm. The larger prototype had exchange rates in saline of up to 71 ml O2/min and 75 ml CO2/min. Gas exchange fluxes (O2 = 119 ml/[min.m2] and CO2 = 125 ml/[min.m2]) for the PAL-B are significantly higher than that of commercially available oxygenators in saline. Future prototypes will have increased surface area and fibers smaller than the 0.038 cm outside diameter fibers used in the present prototypes. A primary concern in using microporous fibers to push the blood was the durability of the fibers at high pump speeds. High speeds exhibited no negative effects on gas exchange abilities or fiber durability.     

B对X100/X120高强度管线钢连续冷却相变组织的影响

 利用热模拟技术（DIL805A热膨胀仪）和显微分析方法,对不同成分体系X100/X120高强度管线钢在连续冷却转变下的显微组织的变化规律进行了研究。研究结果表明,对于无B钢,随冷速增加,组织中依次出现多边形铁素体(PF)、粒状贝氏体(GB)、贝氏体铁素体(BF)和马氏体(M)。B元素的添加使得管线钢相变开始温度降低到500℃左右,抑制了多边形铁素体的形成,促进了贝氏体的形成。为了获得高级别管线钢X100的复相组织,无B钢的冷却速度应控制在20~30℃/s,而含B钢的冷速只需控制在5~15℃/s,简化了冷却工艺。     

100t转炉汽化冷却烟道改造

通过炼钢转炉汽化冷却系统的改造,将强制循环和自然循环相结合的冷却方式改为自然循环冷却方式,改造后彻底解决了中压泵漏水问题,改变了汽化冷却系统的运行状况,设备故障率明显降低,达到了同行业设备先进水平,并有效地节约了电能。     

高温轴承钢M50连续冷却转变曲线的测定与分析

利用膨胀法在DIL805A型淬火膨胀仪对高温轴承钢M50（/%:0.82C,4.25Cr,4.17Mo,1.03V）开展了临界点测定及冷却速度0.02～40℃/s的连续冷却转变试验,并绘制了静态CCT曲线,结合室温下的显微组织以及维氏硬度分析,系统研究了冷却速率及奥氏体化温度（1 000℃和1 120℃）对高温轴承钢M50组织转变以及静态CCT曲线的变化影响。结果表明:高温轴承钢M50的临界点不受奥氏体化温度影响,A_c1与Accm温度分别为808℃和852℃;珠光体转变的临界冷速为0.05℃/s,奥氏体化温度的提高促进了马氏体转变起始温度的降低以及贝氏体转变区间在静态CCT曲线上的右移,并且显著提升了高温轴承钢M50在较低冷却速率条件下的室温硬度。