高炉循环冷却水补水的水稳试验研究

利用包钢总排回水作为高炉循环冷却水的补充水,采用静态筛选出了403复合水质稳定剂配方。试验结果表明403复合缓蚀阻垢剂具有优异的缓蚀阻垢性能,利用该配方处理加入包钢总排回水的高炉循环冷却水,可以满足高炉生产需要。     

空调循环水处理的分析与建议

空调循环冷却水很容易受到外界的污染,使循环冷却系统结垢、腐蚀以及微生物大量繁殖,以致寿命减少。本文研究采用软化法并结合排污,投加阻垢分散剂等方法除垢;用药剂法、表面涂耐腐蚀层等方法来防腐;用增设旁流水等方法来去除微生物。处理后冷却水水质良好。     

焦化厂循环水处理技术的研究与应用

根据焦化行业循环冷却水系统的特点和工艺条件,结合石家庄市水质特点,筛选出适合其运行条件的水质稳定剂配方,在实际运行中收到了良好效果,各项指标均达到了设计规范的要求。     

某钢厂连铸冷却水系统水质稳定试验研究与应用

通过对某钢厂连铸冷却水进行水质稳定处理试验研究，筛选出耐高温的 阻垢缓蚀剂配方，研究和现场试验结果表明，该配方具有优异的缓蚀阻垢效率和广泛的工业应用前景。     

工业循环冷却水水质稳定剂的研制与应用

通过对循环冷却水的阻垢和缓蚀药剂配方筛选实验和现场工业实验与应用，探索出了一条解决高硬度高碱度且含盐量变化频繁的工业循环冷却水的阻垢和防腐问题的方法。     

低频电磁场处理中水的水质稳定试验研究

 针对循环冷却水运行过程中常出现的结垢与腐蚀问题,采用低频梯度电磁场对中水进行水质稳定试验。通过静态正交试验对电磁场运行参数进行优化,然后将其应用到循环冷却水动态模拟试验中。结果表明,非换热界面的结垢与腐蚀问题可以得到显著控制,污垢沉积率与腐蚀率分别由静态试验条件下56.85 mg/(cm2·月)、0834 mm/a降低到动态试验条件下35.02 mg/(cm2·月)、0.136 mm/a,并有继续下降的趋势;换热界面的结垢现象严重,污垢沉积率达184.59 mg/(cm2·月),但腐蚀率可以得到显著控制,为0.158 mm/a。经XRD分析发现,中水中的大量Mg2+一方面抑制了电磁处理的阻垢作用,另一方面在电磁处理条件下可以促进铁表面形成致密的MgFe2O4保护膜,起到缓蚀作用。     

低频电磁场处理中水的静态阻垢缓蚀试验研究

针对循环冷却水运行过程中常出现的结垢与腐蚀问题,采用低频梯度电磁场对中水进行静态水质稳定试验。通过正交试验对磁场运行参数进行优化后,一次性过磁处理可以使阻垢率达到21.46%,缓蚀率达到12.31%;经多次性循环过磁处理可以使二者进一步提高,2.0h的多次循环处理阻垢率可提高到35.30%,缓蚀率可提高到17.50%。通过SEM与XRD分析发现,电磁处理能够改变碳酸钙晶体的结构形态,可以促进铁表面形成致密的γ-Fe2O3氧化膜,起到缓蚀作用。     

攀钢高炉净环水系统水质稳定技术──杀菌灭藻及缓蚀阻垢研究

循环冷却水系统中藻类的繁殖累积，将直接影响循环水的稳定性，故要杀菌灭藻，其方法和手段有多种。该厂通过研究以氧化型杀生剂优氯净和非氧化性杀生剂ＦＮ—７３２６混合使用，不但能杀菌灭藻，而且还能阻垢缓蚀。     

GSP系列水质稳定剂在铁合金电炉循环冷却水中的应用

针对电炉热量大，水温高，水冷设备容易结垢的运行特点，总结了应用全有机配方GSP－518和杀菌灭藻剂GSP－11进行循环冷却水水质稳定处理的经验。     

加热炉循环冷却水水质稳定的探讨与实践

针对加热炉循环冷却水存在的问题，提出了水质稳定方案，完善了水质监测手段，保证了冷却水系统的安全运行。     

Dynamic Tests on Large Cable-Stayed Bridge

This paper describes the dynamic tests performed on a large cable-stayed bridge, Vasco da Gama Bridge, on the basis of a nonconventional testing system, comprehending several independent accelerographs conveniently synchronized by a laptop, as well as a laser interferometry system for noncontact dynamic measurements in stay cables. This system showed to be rather portable, efficient, and accurate, leading to the creation of a very large high quality database concerning the dynamic behavior of the bridge. Subsequent processing of the data permitted accurate identification of all the significant modal parameters of interest from the aerodynamic and seismic point of view and presented a very good correlation with the corresponding values provided by the 3D numerical finite-element model previously developed at the design stage.     

中心组合设计优化SG-5型PVC稀土复合热稳定剂的研究

采用正交设计与中心组合设计法优化了以硬脂肪酸镧、硬脂肪酸高铈、硬脂肪酸钕为复合热稳定剂的配方,得到了这三种稀土化合物对SG-5型PVC热稳定性产生作用的响应面图,探讨了稀土金属离子对PVC的稳定机理;检测了产品的性能。优化结果表明,以SG-5型PVC0.5g、硬脂肪酸镧为0.013g、硬脂肪酸钕0.0196g及硬脂肪酸高铈0.02g所组合得到的PVC树脂,其热稳定温度达到183.3℃,并能稳定35分钟以上,比正交实验结果180.8℃提高2.5℃,其力学性能优于正交结果。La3 、Ce4 、Nd3 对PVC树脂的热稳定作用与它们离子半径的大小及与自由基成键的能力和吸附能力呈正相关性。     

环境友好型水质稳定剂的开发与应用

文章针对包钢循环冷却水水质(以黄河澄清水为补水),自主开发一种高效低磷的复合水质稳定剂,药剂合成方法简单、成本低廉,并进行了缓蚀阻垢性能测试,取得满意的实验结果。     

Study on Mechanism of Rare Earth PVC Stabilizer

Rare earth compounds can be used as PVC thermal stabilizers. According to the infrared spectra of the mixture of PVC and some stearates, the mechanism of stabilization of different stearates was studied. The specialty of rare earth stabilizers was found. They can change the conformation of PVC and restrain the elimination of HCI. From this aspect, the unique synergetic effect with other stabilizers of rare earth compounds can be explained.     

Parametric Study on the Dynamic Instability Behavior of Laminated Composite Stiffened Plate

This paper deals with the study of dynamic or parametric instability behavior of laminated composite stiffened plates with step-uniform and concentrated in-plane harmonic edge loading. The eight-noded isoparametric degenerated shell element and a compatible three-noded curved beam element are used to model the plate and the stiffeners, respectively. The method of Hill’s infinite determinant is applied to analyze the dynamic instability regions. Numerical results are presented through convergence and comparison with the published results from the literature. The effects of parameters like loading type, stiffening scheme, lamination scheme, dynamic load factor, and boundary conditions are considered in the dynamic instability analysis of laminated composite stiffened plate. It has been shown that the type of loading and the width of loading have remarkable effect on the dynamic instability characteristics of the stiffened plate.     

水质稳定剂在锰铁高炉煤气洗涤水中的应用

用ＷＴ－３０３Ｂ水质稳定剂处理锰铁高炉煤气洗涤水，可确保系统无垢运行，药剂 浓度可控制在５ｍｇ／ｌ左右。     

鞍钢炉料冶金性能动态热模拟试验研究

按球团矿在鞍钢2 580 m3高炉内不同高度位置的温度条件、气氛及停留时间,在实验室动态模拟了炉料在高炉内的升温还原变化过程。通过球团升温还原膨胀试验、不同温度下恒温还原试验和900℃标准检测结果对比分析,得出了在高炉条件下的还原膨胀率低于检验标准的900℃膨胀率;鞍钢球团矿还原膨胀在正常范围内,但对弓一球团还原膨胀也应引起重视。鞍钢高炉使用酸性球团矿的配比在20%~30%时,熔滴性能相差不大。高炉使用球团矿比例由25%提高到30%后,炉况波动的主要原因不在于球团矿比例增加。通过生产一定镁或钙含量的球团均可降低球团矿还原膨胀及改善熔滴性能,从而可提高球团矿使用比例。     

水稳剂在焦化厂循环冷却水系统的应用

介绍了焦化厂循环水工艺流程，系统水质及水质稳定剂的性能。该水稳剂投入运行后，解决了冷却设备的结垢，腐蚀及菌藻滋生的影响。     

Assessment of Soil Stiffness Properties by Dynamic Tests on Bridges

This paper presents a method to determine soil stiffness properties using measured structural modes of bridges. Normally, the identified mode shapes have to be smoothed. The mode shapes are approximated using functions describing the transverse vibration of distributed–parameter systems. Artificial coefficients are introduced into this solution in order to sum up the error contributions of displacements and its derivatives up to second order. Then, a pier-soil model based on normalized mechanical impedance functions is used. Applying this method along with more than one vertical mode shape leads to acceptable and more accurate results. The amplitudes of pier bottom vibrations are chosen as the suitable weights for the averaging procedure. For the Warth Bridge situated near Vienna, shear wave velocities and shear moduli at the pier foundations have been estimated. The results correspond quite well to the geological investigation.     

Tanaro Bridge: Dynamic Tests on a Couple of Spans

The Tanaro Bridge, an 18-span 225-m long bridge on the Tanaro River in northwestern Italy, presented the following elements of interest: (1) the barrel divided into adjacent arches; and (2) transverse tie bars and internal spandrels connecting the three parts of the barrels. Its demolition, in 2003, gave the opportunity of performing dynamic tests on a couple of spans at two stages of demolition: (1) fill removed; and (2) fill and internal spandrels removed. Without the uncertain contribution of the fill, some features of the mechanical response of masonry bridges are discussed and the efficiency of tie bars and internal spandrels is addressed. The data provided can be useful for safety assessment procedures.