冷轧浓油废水预处理设施的设计与运行

就宝钢不锈钢有限公司配套建设的冷轧浓油废水处理工程的浓油废水预处理设施的设计与运行进行了介绍和分析,可作为相似工程中的借鉴和参考。     

抗滑桩细观受力特征的数值模拟研究

抗滑桩是滑坡防治工程中一种非常有效的支挡措施,其受力特征直接关系到滑坡防治效果,因此开展抗滑桩细观受力特征的数值模拟研究具有重要的工程应用价值。基于有限元数值模拟方法,采用ANSYS软件中的分离式模型,以SOLID65单元和LINK8单元分别模拟钢筋混凝土抗滑桩中的混凝土和钢筋,研究了不同荷载作用下抗滑桩的细观受力特征。结果表明:在相同荷载作用下,抗滑桩在高度较小阶段,其高度与抗滑桩的变形呈非线性变化,随着抗滑桩高度的增加,其高度与抗滑桩的变形趋于线性关系;有限元数值模拟能较好地反映钢筋混凝土抗滑桩的细观受力特征。该研究可以为抗滑桩工程的设计提供借鉴与参考。     

海水淡化水在既有管网输配的铁释放控制研究

由于具有强腐蚀性,海水淡化水在既有市政管网输配过程中往往会产生严重的"红水"现象,主要是由于管网中铁的释放.为了研究控制既有管网中铁释放的有效措施,对管龄为30～40 a的钢管和灰口铸铁管内壁的腐蚀瘤进行分析,主要组成物质为Fe3O4和FeOOH;选择腐蚀较严重的钢管进行静态浸泡试验,重点分析了自来水和淡化水的掺混比、pH值、碱度、氯离子和硫酸根离子对铁释放的影响,并以铁浓度为控制量,初步给出了海水淡化水在既有管网中安全输配所需满足的水质条件:自来水和淡化水的掺混比≥2∶1,pH值在7.6以上,碱度>200 mg.L-1.     

微生物絮凝剂ZS-7的纯化及其结构特征研究

采用透析、乙醇沉淀、凝胶过滤层析对微生物絮凝剂ZS-7进行了纯化.经鉴定纯化后的微生物絮凝剂ZS-7是一种新型的糖蛋白,其产量大约为0.98 g/L发酵液.ZS-7主要由多糖和蛋白质组成,含量分别为91.5%和8.4%.进一步的分析表明ZS-7中含有酸性多糖包括糖醛酸(16.4%)、丙酮酸(7.1%)和乙酸(0.5%).采用凝胶色谱法测得ZS-7的相对分子质量为6.89×104.红外光谱、X射线能谱图和核磁共振图谱说明糖蛋白絮凝剂ZS-7含有羟基、氨基、羧基、甲氧基和磺酸等功能性基团.单糖组成分析说明ZS-7主要由鼠李糖、甘露糖、葡萄糖和半乳糖组成,各单糖的摩尔比大致为:半乳糖∶葡萄糖∶甘露糖∶鼠李糖=142∶2.2∶4.5∶3.4.     

火灾下钢框架结构热-力耦合模拟与性能分析

基于"自然火灾安全概念"(NFSC)的基本思想,提出了火灾下钢结构热-力耦合模拟方法。利用ANSYS的参数化设计语言,建立了ANSYS软件与OZone火灾分析软件的数据接口,实现了火灾分析软件与大型有限元软件的耦合运用。基于火灾模拟软件OZone的分析结果,利用APDL语言,对钢框架结构进行了真实火灾场景下的热-力耦合模拟。研究表明:钢框架结构在真实火灾场景下,受非均匀变热流影响,结构内部将产生热应力梯度和应力牵移现象;同时钢框架中钢梁固接时,火灾初期变形较小,当达到某个关键时间点后将开始大的变形破坏,其主要原因是钢框架内部产生塑性铰,即钢梁由固接变为铰接,释放了对钢梁的约束。     

钢铁行业大气环境影响评价方法与建议

按钢铁行业大气环评报告书的结构和顺序,结合HJ 2.2-2008《环境影响评价技术导则大气环境》中的相关技术要求,从评价因子、源强、评价等级、大气监测、大气预测、防护距离等方面出发,分析了钢铁行业大气环评中的评价等级确定、大气监测、大气预测等工作中存在的问题,并提出解决方案和建议对策。     

Effect of oxide-based fluxes on mechanical and metallurgical properties of Dissimilar Activating Flux Assisted-Tungsten Inert Gas Welds

Present investigation is to study the “Effect of Activating Fluxes on Mechanical and Metallurgical Properties of Dissimilar Activated Flux-Tungsten Inert Gas Welds”. Effect of current, welding speed, joint gap and electrode diameter on weld bead dimensions on 6 mm thick dissimilar weld between carbon steel to stainless steel, was studied under Activated Flux-Tungsten Inert Gas Welding process. During this investigation three different types of oxide powders were used-TiO₂, ZnO and MnO₂. After welding samples were subject to mechanical testing, in addition to characterization via micro hardness and microstructures of Normal Tungsten Inert Gas Welds and Activated Flux-Tungsten Inert Gas Welds. Activating fluxes TiO₂ and ZnO are effective fluxes for Activated Flux-Tungsten Inert Gas Welding of dissimilar weld between CS to SS. Highest depth/width (D/W) ratio reported under TiO₂ and ZnO fluxes compare to Normal-Tungsten Inert Gas Welds. Lowest angular distortion was observed under TiO₂ flux compare to Normal-Tungsten Inert Gas Welds. Mechanical properties, Joint Efficiency of Activated Flux-Tungsten Inert Gas Welds are higher than normal-Normal Tungsten Inert Gas Welds. Tensile Test specimens of both the processes failed from the parent metal (carbon steel side). Carbon migration from CS to SS, had occurred which led to failure of weld joints from CS side.     

Microstructure of 2205 duplex stainless steel joint in submerged arc welding by post weld heat treatment

The 2205 duplex stainless steel (DSS) is of both good properties austenitic steel and ferritic steel, which applies to the shipbuilding industry usually. In this paper, the OM, XRD and microhardness test methods are used to analyze the variation of submerged arc welded (SAW) joints with and without post weld heat treatment (PWHT). The research results show that the σ phase disappear in the fusion edge zone near heat affect zone (HAZ) and an increase in the welded center zone during the follow-up PWHT, while the amount of γ phase is decreased in the welded center zone with PWHT. A segregation distribution of some second phases is also found in the welded center zone after PWHT. There have two pick values of microhardness arise in the fusion edge zone and the welded center zone separately without PWHT. However, a maximum value of microhardness at the fusion edge zone near HAZ is disappeared and the other is still held at the welded center zone during PWHT. It can be attributed to the changes of second phases, element diffusions and particle segregation during PWHT. A developing mechanism is issued to demonstrate the second phases transferring of the 2205 DSS SAW joints by PWHT.     

45~#钢在西双版纳大气环境下的腐蚀研究

目的研究西双版纳热带雨林地区大气环境下材料的初期腐蚀行为。方法使用45#碳钢在西双版纳大气环境下进行1年的大气暴露腐蚀试验,并利用质量损失分析、SEM、XRD和FTIR等技术,分析45#碳钢在西双版纳大气环境下暴露1年的腐蚀行为。结果 45#碳钢的腐蚀产物以γ-FeOOH,Fe(OH)3和Fe3O4为主,并有少量的α-FeOOH。结论西双版纳大气环境腐蚀性为C2级。在暴露1年的时间内,锈层化学稳定性随试验时间的延长逐渐增强,对基体的保护性逐渐加大。     

某大型钢结构项目喷涂废气污染防治措施可行性分析研究

钢结构建筑是一种新型的节能环保的建筑体系,大多数大型钢结构产品在生产过程中均需要进行抛丸除锈、喷涂处理,使用油漆进行喷涂过程中将不可避免地产生含TVOC(主要为甲苯、二甲苯和非甲烷总烃)的有机废气。大型钢构类生产项目喷涂废气的收集和处理尤为困难。文章结合某大型钢结构生产企业实际采取的喷涂废气治理方法进行喷涂废气污染防治可行性分析,旨在为同类项目喷涂废气污染治理及进一步改良涂装废气治理工艺和技术提供参考依据。