宝钢3号高炉冷却壁更换及效果

对宝钢3号高炉冷却壁的现状及炉体冷却的薄弱环节进行了分析，指出了更换S-3段冷却壁的必要性。重点对更换S-3段冷却壁过程中一些主要的高炉操作经验进行了总结，如降料线操作、炉渣调整、休送风控制等，并阐述了更换S-3段冷却壁后高炉炉体冷却实际效果和技术经济指标的改进。     

由冷却壁损坏谈高炉长寿

南钢两座新建大型高炉,设计采用了较多长寿技术,但投产不到一年时间冷却壁开始损坏,两年内大量损坏,严重影响高炉顺行和技术经济指标。2007年6月项修将2000m^3高炉B1段冷却壁更换为铸铜冷却壁,目前运行情况良好。2009年4月项修更换2500m^3高炉S1、S2段铜冷却壁,现已顺利投产。本文分析冷却壁损坏原因,进而探讨高炉长寿技术,提出高炉长寿建议。     

2500m~3高炉挖补式更换冷却壁实践研究

高炉冷却壁是高炉冷却系统的重要设备,冷却壁的安装是高炉设备安装施工的重点和难点。文章阐述河钢集团承钢公司2500m3高炉冷却壁更换检修中的几个关键因素,并制定了相应的技术措施,高炉冷却壁更换成功。希望研究对同类施工具有指导和借鉴意义。     

邯钢3200m~3高炉中修停炉及开炉操作

邯钢3200m~3高炉中修停炉时,采用前期快速降料面、憋压出铁、充氮气保护、根据料面深度控制风量与打水量等措施,实现了高炉安全、环保、快速停炉。停炉后,采用不入炉直接更换铜冷却壁技术,使炉内降温、冷却壁更换与炉顶设备更换同时进行,既节约了中修时间,又避免了快速降温大量打水破坏炉缸炭砖。高炉中修开炉非常成功,开炉第3天利用系数达到2.45,燃料比降到495 kg/t。     

宝钢3号高炉冷却壁更换技术

对宝钢3号高炉快速更换整段冷却壁关键技术进行了总结。宝钢3号高炉投产10年后,因S3段冷却壁烧损变形严重,导致部分炉皮发红,对高炉寿命造成严重影响。为解决此问题,宝钢把它列为重大设备问题进行攻关, 对S3段冷却壁重新设计选型,并进行快速全量更换。经1年时间攻关,在100h内成功完成该项目,且复风后8h就达到全风量冶炼。     

济钢高炉更换冷却壁的实践

从冷却壁更换方案的确定、冷却壁的选型、施工网络的编制及准备工作等方面,介绍了济钢第一炼铁厂更换高炉冷却壁,进行炉壁再造的经验.     

安钢1号高炉冷却壁整体浇注实践

对安钢1号高炉冷却壁整体浇注实践进行了总结,阐述了冷却壁整体浇注工艺及技术难点.利用环保限产停炉时机,采用冷却壁整体浇注技术更换了 1号高炉部分漏水冷却壁.1号高炉开炉后的生产实践表明,冷却壁整体浇注结构整体性好,操作炉型较为规则,稳定性好,能够形成稳定的渣皮,有利于炉况稳定顺行;与浇注前相比,高炉主要技术经济指标不断...     

宝钢三高炉冷却壁更换施工技术

介绍宝钢三高炉S3段冷却壁更换施工技术.该技术实现了高炉宝修期间且作业人员不进入炉内就能完成大面积冷却壁拆除与安装的短期化、安全施工的目标,达到了国际先进水平.可为类似工程的施工提供参考.     

高炉炉身,炉腹修补技术

炉身上部的修补主要是喷补特制的耐火喷涂料，或安装预制的耐火壁、铸铁冷却壁；炉身中、下部的修补措施主要是喷补、灌浆造衬，在热点和发红部位加冷却棒、更换损坏的冷却设备；对于炉腹，主要是更换冷却设备或在损坏的冷却壁位置安装冷却棒，恢复冷却功能。     

大型高炉降料线快速恢复技术

对宝钢高炉降料线快速恢复技术进行了总结。1号高炉实施了降料线至炉身中下部进行喷涂,3号高炉实施了降料线进行S3段冷却壁整体更换作业,并且均实现了快速恢复,从送风开始至全风炉况正常仅历时8-9h。     

Protein concentration of subcutaneous interstitial fluid in the human leg. A comparison between the wick technique and the blister suction technique

The wick technique and the blister suction technique are the most common methods for sampling of subcutaneous interstitial tissue fluid in man. The blister suction technique has the advantage of being less invasive than the wick technique, but the reliability of this method is still controversial. The aim of this study was to evaluate whether the simpler blister suction technique using large (8 mm) blisters could replace the wick technique in the investigation of patients with postreconstructive leg edema. Fifteen patients with ipsilateral leg edema following infrainguinal bypass surgery for lower limb atherosclerosis were investigated. The two different fluid sampling techniques were applied simultaneously on both legs. The concentration of total protein and albumin as well as colloid osmotic pressure of the subcutaneous interstitial tissue fluid in the leg were measured in all fluid samples. Agreement analysis was applied to compare the two methods, while the correspondence between the methods was estimated with linear regression analysis. The agreement index was found to be positive for all variables from the operated as well as from the contralateral control limb. Furthermore, all values were within the agreement limit. The best agreement between the two methods was found for colloid osmotic pressure on the operated side. According to the equation of linear regression, there was a slight overestimation of the wick values compared to the observed blister values. In conclusion, there was a good methodological agreement between the blister suction technique and the wick technique. The less invasive blister suction technique should be regarded as the method of choice for the investigation of subcutaneous interstitial tissue fluid in patients with postreconstructive leg edema.     

水平超浓相供料溜槽系统全自动运行的微机控制改造(续)

介绍水平超浓相溜槽供配料自动控制系统的设计及生产过程。对氧化铝水平超浓相输送技术、控制设备的选型及自动控制过程进行探讨，使先进的氧化铝水平超浓相输送技术在铝电解生产中充分发挥作用，为企业的技术更新服务。     

水平超浓相供料溜槽系统全自动运行的微机控制改造

介绍水平超浓相溜槽供配料自动控制系统的设计及生产过程,对氧化铝水平超浓相输送技术、控制设备的选型及自动控制过程进行探讨,使先进的氧化铝水平超浓相输送技术在铝电解生产中充分发挥作用,为企业的技术更新服务.     

Detection of plaque-forming cells by a latex bead technique

A new latex bead technique for measuring the plaque-forming cell (PFC) responses to bacterial antigens is described. This technique has been designed for the study of antigens that cannot be readily coated onto SRBC but may also used for antigens that adsorb onto SRBC as well. Application of the latex based technique for the study of PFC response of hamsters to Treponema reiter antigen is described in detail. Using SIII, an antigen that readily adsorbs to SRBC, we have compared the latex bead technique and the conventional SRBC-PFC technique and found that the latex bead technique is more sensitive than the conventional technique. The technique can be used for direct and indirect PFC assays. Technical details for the optimal performance of the latex bead PFC assay are outlined.     

Peritoneal dialysis. An adjunct to pediatric postcardiotomy fluid management

The need for structural grafting in rhinoplasty arises when the nasal skeletal framework is weakened, malpositioned, or both. This review will be limited to structural grafting of the cartilaginous nasal skeleton. Current techniques will be reviewed and a technique introduced that addresses the common deformity of a superiorly rotated and deprojected nasal tip complex while simultaneously correcting nasal valve collapse. This technique is referred to as the Dynamic Adjustable Rotational Tip (DART) technique. The operative technique of the DART, as well as the basic philosophy regarding the tensile nature of the cartilaginous nasal skeleton will be described.     

色谱技术在变压器故障诊断中的应用

论述了变压器油中溶解气体色谱分析与故障诊断技术的原理和方法,结合生产中的典型故障,阐述了其应用,同时简要介绍了油中溶解气体分析和故障监测的其它方法。     

镍钼矿综合利用过程及研究现状

镍钼矿是一种多金属难处理复杂矿,其中含有Mo 0.2%～8.0%,Ni 0.2%～7.0%,镍钼矿的开发利用越来越多地受到关注。介绍了我国镍钼矿资源的特点及分布情况,综述了镍钼矿的选矿处理、冶金处理提取镍、钼的工艺条件、应用情况及各自的优缺点,以及镍钼矿中其他有价元素,如钒和硒的综合回收利用。由于镍钼矿组成和结构复杂,选矿成本高,选矿产生的经济效益不明显。镍钼矿处理的传统工艺为直接还原熔炼法制取镍钼铁合金,或钠盐焙烧后水浸制取氧化钼,但工艺过程产生含SO2的烟气,环境污染大,产品档次低;目前镍钼矿提钼主要采用氧压碱浸、氧化焙烧-碱浸等工艺,以获得高品质的钼酸铵,及较高的钼回收率,但镍钼矿中的镍在工艺过程中未能得到有效的回收利用。镍钼矿采用加钙氧化焙烧-低温硫酸化焙烧-水浸处理工艺,可以同时将镍钼矿中的钼和镍回收,镍和钼的回收率分别达到92%和96%以上,而且能够避免SO2烟气的产生,具有工艺流程短、生产成本低、环境友好等优点。此外,镍钼矿生物处理工艺也展现出了很好的应用前景。     

Periurethral polytetrafluoroethylene paste injection in incontinent female subjects: surgical indications and improved surgical technique

We present the results with 2 techniques for periurethral polytetrafluoroethylene (Polytef) injection in 21 female subjects with type III stress urinary incontinence. The standard technique included the use of a stainless steel needle for injection, paste "sopping" and a Wolff, Storz or Lewy syringe as an injecting element. Postoperatively, no catheters were left indwelling and all patients were encouraged to urinate following recovery from the anesthesia. The modified technique included the use of a 14F angio-catheter for injection of the paste, paste heating and a Lewy syringe or Mentor gun as injector. Postoperatively, all patients were left with an indwelling suprapubic catheter for 3 to 5 days. A total of 27 injections was performed, including 9 with the standard technique and the last consecutive 18 with the modified technique. Average followup has been 11.4 months. Cure, improvement and no change rates from the preoperative condition were 11%, 22% and 67% with the standard technique and 39%, 17% and 44% with the modified technique, respectively. In the latter group 3 patients had received pelvic radiotherapy as definitive treatment for pelvic malignancies. The overall failure rate in patients with a stable detrusor was 42% compared to 75% in the group with bladder instability and low compliance. Advantages of the modified technique include avoidance in the formation of intraoperative and postoperative fistulas, and easier handling and injection of the heated paste to achieve urethral compression. Improved short-term results with the modified technique indicate that a larger group of patients and long-term followup are essential requirements to determine the true efficacy of this technical modification. Based on these preliminary results, we now prefer the modified technique to the standard technique in the management of type III stress urinary incontinence.     

钼酸铵生产的湿法冶炼工艺

钼酸铵是冶金化工生产的一种重要的深加工原料。以钼焙砂为原料生产钼酸铵的湿法冶炼工艺比较多,目前应用比较广泛的主要有2种,既经典氨浸法和离子交换法。本文对2种工艺作了利弊分析,研究认为离子交换法所排放的生产污水氨氮含量低,基于环境保护国策,我国今后钼酸铵生产项目的改扩建或新建工程宜采用离子交换工艺。     

Electrocautery versus epinephrine-injection tonsillectomy

This prospective, single-blinded study on tonsillectomy was done to compare the Bovie electrocautery dissection technique with the epinephrine-and-lidocaine injection technique and to document which technique is safer, faster, and less morbid. Twenty-nine patients who were scheduled for tonsillectomy at two Northern California Region Kaiser Permanente Medical Centers were enrolled in the study. Each patient served as his or her own control, and tonsillectomy technique was randomized on the basis of even or odd numbers of the last digit of the medical record number. The time of injection of epinephrine and time of dissection for each tonsil was recorded. Blood loss was quantified for each dissection, and pain was assessed by asking the patient which side hurt more. I found no statistically significant difference in operating time, intraoperative blood loss, or postoperative hemorrhage between these two methods. The electrocautery, or Bovie, technique produced more clinically significant eschar and delayed healing than the epinephrine-injection technique did. The Bovie technique produced more inadvertent burns to surrounding tissue than the epinephrine-injection technique did, but the epinephrine caused transient tachycardia in 14% of the study participants. The present study showed no difference between the two techniques in postoperative pain experienced by study participants, but other recent studies have shown that patients experience more pain when the Bovie technique is used. Study data do not support the superiority of Bovie tonsillectomy. I recommend epinephrine-injection tonsillectomy as a safe and expedient operation.