锅炉的氧腐蚀与解决方法研究

氧腐蚀是锅炉正常运行的大威胁,本文对氧腐蚀的原理、危害及目前解决锅炉氧腐蚀的办法进行总结和概括,探讨解决氧腐蚀的安全、合适、有效的方法。     

余热锅炉氧腐蚀原因分析及处理办法

某余热电站建成投运1年就发生窑尾SP余热锅炉低压段省煤器腐蚀漏水现象,结合腐蚀管样的分析报告和现场调研,判断是氧腐蚀所致;分析了氧腐蚀的产生原因和腐蚀机理.在此基础上,提出了解决和预防氧腐蚀的措施.     

低压锅炉运行中的氧腐蚀及新型除氧剂的应用

阐述了低压锅炉运行中氧腐蚀的特征、机理、影响因素以及危害,表明低压锅炉运行中的腐蚀主要是氧腐蚀,介绍了TGS—A新型除氧剂的除氧机理和现场应用,表明TGS—A除氧剂除氧效果明显,能够有效地控制锅炉的氧腐蚀,延长锅炉使用寿命,保证锅炉安全运行。最后阐述了锅炉除氧对锅炉安全经济运行的意义。     

锅炉系统常用除氧方法综述

锅炉和循环水设施的腐蚀是世界性的一大难题，各种腐蚀中尤以氧腐蚀最为严重，为防止和战轻热力设备的氧腐蚀，最重要的措施是对锅炉给水进行除氧处理。本文就常用的除氧方法作一综述。     

锅炉系统常用除氧方法综述

锅炉和循环水设施的腐蚀是世界性的一大难题，各种腐蚀中尤以氧腐蚀最为严重。为防止和减轻热力设备的氧腐蚀，最重要的措施是对锅炉给水进行除氧处理。本文就常用的除氧方法作一综述。     

鄂尔多斯钻井泥浆腐蚀性浅析

针对鄂尔多斯钻井过程中出现的钻具腐蚀穿刺严重的现象,对鄂尔多斯现场钻井泥浆进行了腐蚀性试验,结果表明钻井液本身的腐蚀速率较小,分析认为主要的腐蚀源为氧腐蚀.重点讨论了氧对钻具的腐蚀和除氧剂的使用问题,并就钻具腐蚀的控制提出了建议.     

低压锅炉的氧腐蚀问题及对策

针对锅炉承压部件氧腐蚀现象严重的情况,从理论和实践两方面对氧腐蚀现象的机理和特征、影响的主要因素及防止氧腐蚀的对策进行了论述.     

低压锅炉的氧腐蚀问题及对策

针对锅炉承压部件氧腐蚀现象严重的情况，从理论和实践两方面对氧腐蚀现象的机理和特征，影响的主要因素及防止氧腐蚀的对策进行了论述。     

锅炉给水除氧影响因素的研究

在锅炉运行中,氧腐蚀的问题显得格外突出,因氧腐蚀造成的锅炉事故有逐年上升趋势。以下分析影响热力除氧装置除氧效果的关键因素。     

联氨除氧剂

一、锅炉给水中的溶解氧及其去除溶解氧对于炉管的完整性来说是一种威胁。因为溶于水中的氧具有很强的腐蚀性,甚至氧的浓度很低时亦会造成腐蚀。氧腐蚀的最严重状况之一是它以点蚀的形式出现;点蚀使整个金属表面上腐蚀集中在小面积上。这种型式的腐蚀即使腐蚀速度比较低时,也会造成严重破坏。补充水能将相当数量的氧带入系统中。系统中氧的其它主要来源是通过水泵吸入口     

探讨敲击检测技术在复合材料无损检测中的应用

本文根据纤维增强复合材料的特性,列出了损伤的主要类型和产生原因;对适用于复合材料制品的无损检测敲击技术进行探讨;对敲击技术的基本原理、方法分类、适用范围进行介绍;对传统敲击法和数字敲击法进行比较;总结敲击法的未来发展状况。     

Application of the general rate model with the Maxwell-Stefan equations for the prediction of the band profiles of the 1-indanol enantiomers

The adsorption isotherm data of R- and S-1-indanol and of their racemic mixture on cellulose tribenzoate were measured by frontal analysis. These experimental data were fitted to the single-component and the modified competitive Bilangmuir isotherms. The overloaded elution profiles of bands of the pure enantiomers and of the racemic mixture were calculated for different sample sizes, using the best competitive isotherm model and the General Rate Model of chromatography coupled with the generalized Maxwell-Stefan equation that describes the surface diffusion flux. The calculated and the experimental profiles were found to be in excellent agreement in all cases. The parameters of the model of the mass transfer kinetics were derived from the band profiles obtained for the pure enantiomers. The same values of these parameters give an excellent prediction of the profiles of multicomponent bands. The new model described here allows a satisfactory interpretation of the competitive mass transfer kinetics.     

不同芯材热敏变色微胶囊的制备及性能研究

以隐色染料结晶紫内酯、酚酞、苯酚红、甲基红为电子给予体、显色剂双酚A为电子接受体和十二醇为溶剂,制备了可逆热致变色复配物,以密胺脂为壁材,通过原位聚合法进行微胶囊化研究,并对制备条件进行了优化。利用扫描电子显微镜、热重分析法等对微胶囊进行了结构与性能表征。     

噁二唑啉类化合物合成方法综述

噁二唑啉类化合物由于其良好的生物活性广泛应用于医药,农药领域。将噁二唑啉杂环引入其他化合物中,往往能生成一系列具有广谱生物活性的新化物。因此,在新药设计中,噁二唑啉杂环常被用于化合物的结构修饰。近年来,有关这类化合物的合成方法不断得到更新。作者对近年来噁二唑啉类化合物合成方法及反应机理进行了全面综述。     

Effect of the Incorporation of PVC on the Mechanical Properties of the Jute-Reinforced LLDPE Composite

Jute fabrics-reinforced linear low density polyethylene (LLDPE) matrix composites (50 wt% fiber) were prepared by compression molding and mechanical properties were studied. Polyvinyl chloride (PVC) matrix was incorporated instead of LLDPE in the jute based composites and their mechanical properties were investigated and compared with the control composites. It was found that with the increase of PVC in the LLDPE based composites, the mechanical properties were found to improve significantly. Degradation tests of the composites for upto 24 weeks were performed in soil medium. Water uptake and Thermo-mechanical properties of the composites were also studied.     

纳米无机粒子的分散及改性塑料研究进展

阐述了纳米无机粒子团聚的分类和原因,介绍了几种克服其团聚的方法;综述了纳米塑料常见的制备方法以及纳米塑料的优异性能与结构性能的表征方法。     

钛合金胶接接头耐水性的研究

本文介绍了几种表面处理方法对钛合金胶接性能的影响，并讨论了钛合金胶接接头的耐水性能。     

碳化塔内壁鼓包的测定与修复

报道了对某化肥厂碳化塔内壁鼓包进行检测的过程和结果以及修复方法。首先对塔内外壁进行了检验。随后对塔体每个筒节和每个鼓包用测厚仪进行壁厚测定,并对选定的鼓包进行切片检验。最后对鼓包进行了修复。修复后的碳化塔运行状况良好。由此总结出碳化塔修复的要求和技术措施,并对该设备的安全运行提出了建议。     

Effects of the Physicochemical Properties of Metronidazole-Corn Starch Mixtures on the Parameters of the Pellets in the Wet-Granulation Method

Whether the surface free energy of a powder mixture (metronidazole-corn starch) depends on the proportions of the components and how the forces of cohesion and adhesion between the particles affect their interactions as functions of the proportions of the components were investigated. Pellets were produced from the powder mixtures. The interactions between the powder mixtures and the binding agent were first investigated on the basis of the spreading coefficients (S) calculated from the surface free energy. The mechanical properties of the pellets produced were predicted from the S values. Pellet parameters were evaluated as functions of the corn starch content. The overall aim was to investigate the role of the surface free energy of two-component powder compositions in pellet production. In contrast with predictions from the S values, pellets with a more porous and loose texture and with unfavourable mechanical properties can be produced as the S values are increased.     

金属表面原位摩擦自修复陶瓷涂层的机理研究

在金属表面涂覆一层一定配比的超细硅酸盐陶瓷粉末材料和催化剂,经金属表面间的速摩擦作用制备了陶瓷涂层,并通过TEM、SEM等浏试手段研究了陶瓷涂层的成分分布及组织结构,分析了陶瓷涂层的形成机理。