新技术在600MW高压加热器制造中的应用

600MW高压加热器在制造工艺上采用了先进的管板深孔钻、管子与管板液压胀接等先进技术,保证了产品设计制造质量。     

液压胀管技术的应用

液压胀管工艺，其密封性好，抗拉脱强度高，胀接效率高等优点．本文主要通过工艺试验对试样的各种检查，同时同机械胀管的相互比较、分析，产品使用等方面，介绍液压胀管的优点。     

液压胀管与机械胀管技术对比

本文对我公司几年来在定型产品中应用液压胀管和机械胀管的试验与实践予以了阐述，从而得出了液压胀管技术的一些优点。     

330MW倒置立式高压加热器制造

本文介绍了330MW倒置立式高压加热器制的主要研制工艺，解决了MnMo钢管板堆焊碳钢，管子管板封口焊、液压胀管，氦检漏、隔板上装焊包壳及筒体与管系套装等工艺难题。     

应用液压胀管技术提高高压给水加热器胀管质量

本文对近几年哈锅公司在高压给水加热器产品制造中应用液压胀管技术的试验与实践予以了阐述。并和其他胀接技术-机械胀管做了比较,得出了在目前高压给水加热器产品制造中液压胀管技术优于其他胀接技术的结论。     

胀管方法综述

通过介绍胀接的基本原理,对机械胀管,爆炸胀管,橡胶胀管、液压胀管进行了详细的分析,并且对于不同胀管方法的操作方法,胀管器结构、工艺要求,存在问题等方面做了介绍。     

600MW机组超临界“W”火焰锅炉水冷壁联箱管座角焊缝裂纹分析与对策

对国产600MW机组超临界"W"火焰锅炉水冷壁上联箱管座产生大量裂纹的原因进行了综合分析,并利用ANSYS应力软件对该联箱管座进行了胀差应力模拟计算。分析和计算结果表明,管屏管间壁温偏差大、设计不合理,在管座角焊缝出现大的交变胀差应力是产生裂纹的根本原因。在此基础上,提出了通过割除管间鳍片增加管座光管长度,改变联箱炉顶密封结构的方案,使问题得到成功解决。     

超临界600MW高加自主开发设计

随着中国经济的不断发展,600MW及以上等级的火电机组建设进入到一个新的阶段,为了与国际知名大公司竞争,突破其技术垄断,本课题组成功开发出具有自主知识产权的超临界600MW高加,经专家评审,属国内首创,达到世界先进水平。以该型高加为技术依托,已成功在40余套600MW高加设计中推广应用,经济效益、社会效益显著。     

AHR型数控枪钻改进实验及分析

介绍了AHR型数控枪钻深孔钻床工作原理、结构、主要工作参数，枪钻的结构与加工参数。改进枪钻后使用AHR型数控枪钻深孔钻床加工600MW高加加热器管板试样，分析实验结果。     

秦山二期蒸汽发生器管子与管板液压胀管

核电站用蒸汽发生器的管子与管板胀接的胀紧度、密封性、拉脱力,距管板背面未胀接长度,均有严格的考核指标。秦山核电二期工程的蒸汽发生器采用液压胀管方法,为验证胀管设备、胀管接头性能、确定胀管工艺参数,熟悉操作技术进行了试验,并对试验结果进行分析,最后得出有关结论。     

Delay or removal of aneurysm formation in the Anaconda wave energy extraction device

Any distensible tube inflated beyond a critical pressure will experience aneurysm formation. The Anaconda wave energy device consists of a pressurised flooded tube, which when excited with an external incident wave of appropriate frequency, for the set inflation pressure, permits generation of internal bulge waves that provide the mechanism for more efficient wave energy extraction. The distensible tube must be designed to have structural integrity and to facilitate the bulge wave matching the incident wave. The bulge wave speed is governed by internal fluid density and tube distensibility. The latter is readily shown to be dependent upon volume–pressure gradient within the tube. With application of a displacement–pressure based finite element formulation the likelihood of aneurysm and its delay or avoidance can be investigated. The strain energy functions selected for use with the finite element analysis are the Yeoh and third-order Ogden model as these formulations have been previously shown by the authors to satisfy the required Maxwell equal area rule and provide the most consistent predictions when using different mixes of experimental stress-strain data. After summarising a representative set of known wave energy extraction devices, to appreciate how different Anaconda is, the paper looks at the extent and mode of deployment of an outer inextensible reinforcement to provide bulge waves of appropriate speed whilst also overcoming the onset of aneurysms within the Anaconda tube.     

管式空气预热器关键技术

针对管式空气预热器制造过程中的关键点,采取有效的质量控制措施,特别是针对胀管工序进行深入介绍,最终经过一系列改进,产品质量得到了保证。     

锅炉管板鼓疱及裂纹

锅炉管板是燃油锅炉主要的易损部件 ,对锅炉的安全运行造成了很大的隐患。文章结合一台在用的WNS1— 1 0—Y型锅炉的实际情况 ,对其上管板所产生的鼓疱及裂纹进行了综合检测 ,并对造成这些现象的成因进行了分析。另外 ,在对材质分析及强度校核计算的基础上 ,提出了相应的处理方案 ,对同类锅炉问题具有一定的参考价值     

高压不锈钢接管热套结构简述

本文主要叙述了高压管的热套过盈配合结构 ,提出大直径厚壁高压管的解决方法 ,用实例说明这一结构的特点、生产过程、经济效益 ,该结构既符合国情又有利于开发新的大型高温、高压石化产品     

高土石坝变形监测的监测管选型研究

在土石坝分布式光纤变形监测技术中,监测管是光纤与坝体间力-光转换的媒介,它需要适应土石坝围压大、变形量大等特点。据此,采用分段刻槽的ABS管作为光纤应变传递载体的监测管方案,建立坝料-监测管复合体的三维非线性有限元模型,并通过坝料-监测管的大型土工三轴试验验证了该数值模型的有效性。基于该数值模型,研究了监测管在最不利受力情况下的应力分布,以检验其在高围压下的适应性。结果表明,ABS管具有较高强度,可适应300m级高土石坝的高应力状态。研究成果可为土石坝的变形监测提供参考。     

Experimental study on high pressure hydrogen jets coming out of tubes of 0.1–4.2 m in length

The present paper deals with auto-ignition and combustion of high pressure hydrogen leaks through a tube with air into atmosphere. The experiments using a high pressure tube with hydrogen and an extension tube with air of 10 mm diameter are performed to clarify the auto-ignition and combustion behavior of high pressure hydrogen jet spouting through the extension tube. In order to improve repeatability and reliability of experiments, a plunger system with a needle is applied to control a rupture of a PET diaphragm, which separates hydrogen from air. The most important result obtained in the present study is that the minimum diaphragm burst pressure at which the auto-ignition is registered, is found to be between 1.0 and 1.2 m of the extension tube length. This tube length is longer compared to tubes used in the previous studies. Combustion and Mach disk at the extension tube exit to atmosphere are observed using a high speed camera which is set at the frame speed of 1 × 10⁵ fps when the ignited hydrogen jet is spouted out the tube.     

Experimental studies on heat transfer enhancement of the inside and outside spirally triangle finned tube with small spiral angles for high‐pressure preheaters

A new heat transfer enhanced tube—the inside and outside spirally triangle finned tube with small spiral angles (IOSTF tube)—was developed and manufactured for improving the performance of high‐pressure preheaters. The triangle flutes with small spiral angle on the outside surface of the IOSTF tube perform like the vertically fluted tube, and the triangle flutes with small spiral angle on the inside surface of the IOSTF tube perform like the spirally fluted tube. The experiments show that the total heat transfer coefficient of the vertical IOSTF tube is 63–95 per cent larger than that of the smooth tube with only a slight increase in the inside flowing friction and the field results show that a 43 per cent increase in the total heat transfer coefficient of the high‐pressure preheater with the IOSTF tubes can be obtained. Copyright © 2000 John Wiley & Sons, Ltd.     

近临界及超临界压力区垂直光管和内螺纹管传热特性的试验研究

阐述了眚上升布置的内螺纹管和光管在近临界及超临界压力区的传热牧场 生的试验结果。在近临界压力区。随着压力向临界压力造近,光管的传热特性变差,传热恶化的临界干度下降得很厉害,甚至在过冷区就会发生壁温飞升;内螺纹管在近临界压力区可以消除传热恶化,但是随着靠近临界压力其抑制传热恶化的能力下降。传热恶化后的光管和内螺纹管的最小传热系数分别在压力为21．0MPa和22．0MPa。超过临界压力后,光管和内螺纹管的传热特性得到改善,内螺纹管在高焓值区可以降低壁温。     

高分子聚合混凝土作为高堆石坝防渗膜垫层的液胀抗渗及渗漏排水试验

针对高堆石坝防渗膜垫层选用颗粒和水泥无砂混凝土在水压力作用下存在的不足,采用高分子聚合混凝土作为高堆石坝防渗膜垫层,通过液胀抗渗试验和缺陷渗漏排水试验,分析了土工膜的液胀抗渗性能影响因素及土工膜存在缺陷时的渗漏量。结果表明,高分子聚合混凝土垫层存在破损时对土工膜的变形影响最大,其透水性能满足缺陷渗漏的排水要求。     

Heat transfer and pressure drop performance of twisted oval tube heat exchanger

Twisted oval tube heat exchanger is a type of heat exchanger that aims at improving the heat transfer coefficient of the tube side and also decreasing the pressure drop of the shell side. In the present work, tube side and shell side heat transfer and pressure drop performances of a twisted oval tube heat exchanger has been experimentally studied. The tube side study shows that the tube side heat transfer coefficient and pressure drop in a twisted oval tube are both higher than in a smooth round tube. The shell side study shows that the lower the modified Froude number Fr_M, the higher the shell side heat transfer coefficient and pressure drop. In order to comparatively analyze its shell side performance of the heat exchanger, a rod baffle heat exchanger with similar size of the twisted oval tube heat exchanger is designed and its performance is calculated with Gentry's method. The comparative study shows that the heat transfer coefficient of the twisted oval tube heat exchanger is higher and the pressure drop is lower than the rod baffle heat exchanger. In order to evaluate the overall performance of the twisted oval tube heat exchanger, a performance evaluation criterion considering both the tube side and shell side performance of a heat exchanger is proposed and applied. The analyze of the overall performance of the twisted oval tube shows that the twisted oval tube heat exchangers works more effective at low tube side flow rate and high shell side flow rate.