实现点检定修立体化管理 提高设备运行的稳定可靠性

热电厂现有主要设备：高炉汽轮鼓风机组六台，汽轮发电机组两台，锅炉7台，高炉干法除尘系统三套，湿式高炉煤气洗涤系统两套。高炉汽轮鼓风机组分别为AV80、AV56、AV50、德产GHH3200各一台，日产三菱MT—53两台，这六台机组分别担负着为股份公司炼铁厂四座750m^3高炉和型钢公司炼铁厂一座1880m^3高炉的供风任务，正常运行时为五运一备。汽轮发电机组均为12MW机组，肩负着缓解莱钢用电紧张，保证烧结、炼铁用电安全的主要任务。六台锅炉分别为130t／h一台，75t／h煤粉煤气混烧两台，75t／h、65t／h煤气锅炉各一台，其主要担负着为鼓风、发电机组，以及莱钢生产、生活用供应蒸汽，夏季五运两备，冬季则要全部运行。     

2#汽轮鼓风机凝汽器技术改造

天铁2#汽轮鼓风机机组改造后汽轮机汽耗量增加,运行中出现了凝汽器真空缓慢下降,凝汽器端差增大,汽轮机排汽温度显著升高等问题,影响鼓风机正常运行。通过分析计算发现原有凝汽器冷却面积不够用,并提出了2#汽轮鼓风机和备机4#汽轮鼓风机的凝汽器连接的具体措施,取得了良好的效果。     

单回路供电系统保安电源的应用

１概况唐钢动力厂目前有两台瑞士产汽轮鼓风机组，每台机组油系统有两台润滑／控制油泵和商台动力油泵，自１９８９年投入运行以来，系由２２０ｋＶ电网单回路供电，因而当电网发生突发性事故停电时，会导致油系统油压下降或断油，威胁机组的安全运行。２现状分析汽轮鼓风机组运行时，润滑／控制油泵和动力油泵供给机组的润滑、控制和风量调节油量，油泵电机分别为３８０Ｖ３０ｋＷ和１５ｋＷ，两泵运行时各有备用，电源引自同一变电所，该变电所是单回路２２０ｋＶ的分支变电所，变电所内有一条由特钢引来的保安电源５２２，联络在１０ｋＶ…     

D900-37型汽轮鼓风机的形成及应用

三明钢铁厂为提高风机出力，满足３１４ｍ～３高炉小高压炉顶供风的需要，决定重新配置一台汽轮鼓风机组。但国内无此种类型成套机组的定型产品，故通过认真的校验和计算，决定将杭汽厂的Ｎ３—２４型汽轮机与沈鼓厂的Ｄ９００—３１风机经改进后两者配套，从而形成新的Ｄ９００—３７型汽轮鼓风机组。文章介绍了改进方法及所遇到主要技术问题的处理办法。     

鼓风机站凝结水系统的工艺完善

１概况唐钢１＃鼓风机站，担负着唐钢２座１２６０m３高炉送风的任务。现有３台额定功率为１３６１３kW的汽轮鼓风机组和１台１２０００kW的电动机组，平时鼓风机组运行２台，电动机组长期运行运行。有喷雾填料式除氧器４台，全部投入运行。凝结水系统为母管制，每台机组的凝结水经凝结水母管，再进入每台除氧器。２存在问题２．１凝泵汽蚀由于４＃机组的凝汽器的直径较大以及现场位置所限，凝泵实际倒灌高度只有１．８５m，加之管道布置得不合理、弯管较多。在机组调试阶段出现了典型的汽蚀现象，凝结泵不能正常工作。２．２无法隔绝现运…     

Z—3250—46型鼓风机转子动叶片断裂原因初探

宣钢1260m^3高炉配两台Z—3250—46型轴流式鼓风机．由G12—35型凝汽式汽轮机作原动机，平时一开一备。本文以2#鼓风机1991年4月发生的一次设备事故为例，对转子动叶片断裂原因进行初步探讨。     

D1300-31型高炉鼓风机润滑油站加热器改造

1概述高炉鼓风机是供给高炉冶炼所需空气的专用设备,安钢380m3高炉配备了两台沈阳鼓风机厂制造的D1300—31离心式鼓风机,其进口流量为1300m3/min,出口压力为0.314MPa,各轴承均为滑动轴承,稀油润滑,其配套润滑油站型号为YZ—45。投运几年来运转平稳,满足了高炉生产的需要。在风机的润滑系统配备了两个型号为GYY/15—380/10电加热器,一个1.2m3的事故油箱,一台电动油泵,一个轴头泵,两个列管式油冷却器,用来保证机组各轴承部的正常润滑。电加热器的主要作用是在风机启动前把润滑油加热到20℃以上,确保形成良好的润滑油膜,防止因润滑油温度过…     

热轧站AI750/D500型煤气鼓风机润滑油系统改进

1前言随着攀钢热轧板厂进行三期扩能工程建设,攀枝花新钢钒有限公司动力厂热轧煤气加压站也相应地进行了扩能改造:新上3台高炉煤气鼓风机AI750,同时将原来2台焦炉煤气加压系统进行了改造,新上了3台焦炉煤气鼓风机D500。两种型号风机的轴承润滑系统工艺流程一致,见图1。它们都是用滑动轴承靠主油泵向各个润滑点供油,每套机组都单独设置了一个高位油箱,以达到机组停车或事故状态下保安用油润滑的目的。从机组油系统的设计、安装和试运行的实际情况分析,该站新上风机的润滑油系统存在几个方面的问题,由于两种机组存在缺陷基本一致,现一并介绍…     

1080m~3高炉冷风系统运行稳定性研究与实践

针对4台1080 m3高炉配套汽轮鼓风机运行不稳定的问题,通过实施主油泵联轴器改造、防喘阀起源改造、在线不减负荷凝汽器铜管差漏以及对调速系统的改造等措施,减少了汽轮机故障停机次数和供风波动,为高炉稳定生产创造了条件。     

应用粘接堵漏新工艺修复高炉鼓风机

本钢一铁厂现用的三台高炉汽轮鼓风机，均为部控设备。其中1#、2#风机为瑞士1928年产品，分别给1#、2#两座380m^3高炉供风；另外6#风机是1926年德国产品，做为1#、2#风机的备机。     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.     

Kinematics of the pelvic girdle and the thoracic and lumbar segments in the course of the lateral inclinations and rotations of the spine

Physiological displacements of the trunk are the addition of these of the pelvic girdle and thoracic and lumbar spine segments. For a long time (3), this conjunction had been noticed but without numbered precisions. The purpose of this communication is to appreciate quantitatively, from a series of 16 subjects, the respective share of each components during lateral bending movements in the frontal plan and movements of rotation in the transverse plan. It results from this work that the pelvic girdle presents as reduced amplitude (4 degrees) in lateral bending on the other hand, displacement predominate to the level of thoracic spine (50 degrees). In rotation pelvic displacements are very important (30 degrees), while the spine so thoracic that lumbar has a weak participation (inferior to 5 degrees). Moderated abduction of hips increases by significant manner the motility of the pelvic girdle.     

Design and analysis of the tunnel connecting the beamcorridor and the spectrum hall of the CSNS

There is a tunnel connecting the beamcorridor and the target station in the spectrum hall in the CSNS project. The length of the tunnel is about 20 m. The shielding design of the tunnel is very significant for the persons working in the spectrum hall beca     

江西省降水集中期及其期间降水量的变化特征及趋势分析

根据江西省地方标准中有关降水集中期的定义,统计1971～2008年4～9月的降水集中期,并用季节性Kendall检验方法做趋势分析.结果表明,1971～2008年4～9月期间,6～8月是降水集中期及其期间雨量较多的月份,4、5、9月是降水集中期及其期间雨量较少的月份.随时间变化,全省6～8月降水集中期及其雨量呈可能增多趋势,4、5、9月呈可能下降趋势.     

优化焊缝金相组织 充分发挥石油用 ERW管的技术经济优势

P2ERW管代替无缝管,用于石油开采所用油管和套管的关键,是确保焊缝的高质量。它不仅需要具备先进的技术装备和完善的检测手段,更需要发挥金相检验对优化各项工艺参数的指导作用,才能从根本上掌握生产优质ERW石油用管的规律。     

谈投标报价策略和技巧

建筑企业参加投标竞争,目的在于得到对自己最有利的施工合同,从而获得尽可能多的盈利.为此,做出投标决策以后,必须仔细研究投标报价策略,并借助投标报价技巧,以达到既能中标又能赢利的目的.