浏阳河大桥钢箱拱拱肋HALS-MnZn新型防腐涂装技术

1概述 钢箱拱拱肋防腐涂装技术,从简单的油漆防腐,发展到金属热喷涂锌、铝和单一环氧树脂、聚氨酯树脂及其改性防腐涂层材料,以及环氧树脂和丙烯酸改性环氧复合防腐涂层的应用,无一不在记录着钢结构防腐技术的一个个里程碑.长沙火星北路浏阳河大桥在此基础上,以大桥百年大计为着眼点,广泛征询专家意见,并由此推出代表国内外先进的HALS-MnZn新型防腐涂装专项技术.     

冷喷锌防腐工艺研究

介绍了冷喷锌防腐涂装工艺、质量检查、防腐年限估算,并对常用的有机涂层、热镀锌、热喷涂锌和冷喷锌防腐方案进行了经济性分析。指出冷喷锌防腐技术具有节能、环保、施工方便、易维护、全寿命周期成本低、防腐年限长等优点,符合国家发展低碳经济要求。     

《建筑钢结构防腐蚀技术规程》设计使用介绍

介绍了《建筑钢结构防腐蚀技术规程》(JGJ/T 251—2011)有关的防腐蚀机理和防腐蚀设计的主要内容。主要包括:腐蚀性等级的判定,腐蚀裕量,防腐蚀构造措施,除锈方法和等级划分,防腐蚀保护层的设计原则、厚度选定,防腐涂装的配套使用,金属热喷涂的使用环境、热喷金属选择、热喷涂层封闭处理,钢结构防腐与防火。并通过算例介绍建筑钢结构防腐蚀的设计。     

浅析钢结构防腐涂装施工质量控制

钢结构的防腐处理是钢结构设计和施工工作中的关键环节,其和钢结构的使用年限、造价成本、维护保养以及美观性等有着密切的关系。所以,人们一定要做好钢结构防腐涂层施工质量的管理和控制工作,根据国家相关的热喷涂技术规定和要求,提高钢结构的防腐涂层的施工质量。     

大桥钢箱梁涂层翻新工艺

阐述了大桥钢箱梁涂层的使用寿命以及维修保养的最佳时期。为提高大桥钢构件防腐性能,延长钢箱梁涂层的使用寿命,参照国际标准ISO 14713—1999《铁和钢结构的防腐锌和铝涂层指南》热喷涂防腐蚀涂层体系,针对大桥钢箱梁涂层翻新设计了两种涂层配套方案。     

河北博锐特工程有限公司

博锐特工程有限公司成立于2006年，其前身是一家有着40年施工经验的综合性防腐保温，设计安装知名企业，主要承接各种设备、管道、船舶等设施项目的防腐、保温、防水、消防、防火、热喷涂、安装、环保等工程施工。     

论埋地PCCP管道的防腐措施

从PCCP管道的自防腐性能着手,介绍和比较了在严酷环境条件下目前国内外常用的各种PCCP管道的防腐措施,并提出了埋地PCCP管道防腐设计的实用准则和推荐复合防腐措施.     

聚乙烯胶带防腐层起泡原因分析及处理措施

聚乙烯防腐胶带在油气管道上应用已有近50年的历史,因其优越的防腐性能和施工性能,聚乙烯胶带防腐层体系,已成为国内外最重要的埋地管道尤其是埋地油气管道外防腐体系之一。     

热喷涂技术在钢结构防腐中的应用

钢结构腐蚀是一种惊人的浪费 ,多年来人们一直设法对钢结构进行防腐以减少这种浪费。我国目前基本采用油漆(涂料 )防腐或石油沥清防腐 ,有效期最长不超过五年。频繁的维修除需要大量维修费外 ,还会导致停工、停产 ,从而影响生产效益。据国外权威机构统计 ,全世界每年生产的钢铁 ,共有 1 10因腐蚀而浪费掉。在工业发达国家 ,因腐蚀造成的经济损失相当于生产总值的 2 %～ 4% ;1975年美国由于腐蚀造成的损失大约 70 0亿美元。国家科委的调查结果表明 ,我国每年因为腐蚀造成的损失也在 2 0 0亿元以上。热喷涂是一项金属表面强化、保护的新技术 ,…     

建筑钢结构防腐技术综述

随着建筑钢结构的发展,建筑铜结构的耐久性问题越来越引起了国内外工程界的关注和重视。介绍了建筑钢结构各种防腐方法及其防腐机理,防腐特点和使用情况。     

锅炉锅筒底部水渣沉积的解决措施

阐述了将DZL型热水锅炉铜筒排污管改为吸污引射两用管的具体方法,此方法有效地预防锅筒底部水渣沉积和锅筒鼓包、破裂等问题的发生。     

喷涂聚氨酯硬泡外保温系统龙骨热桥效应及抗风压性能研究

主要阐明了喷涂聚氨酯硬泡外保温系统中外挂装饰板所使用的龙骨产生的热桥效应以及由于龙骨外挂装饰板材所产生的空气层对系统抗风压性能的影响.通过建立足尺寸模拟房屋的大型实验,确定了热桥对外保温系统保温性能的影响程度,又通过大型风压试验确定了喷涂聚氨酯硬泡外保温系统中外挂装饰板做法的抗风荷载能力,为龙骨外挂装饰板的聚氨酯硬泡外保温系统的推广提供了依据.     

膨胀珍珠岩的聚合物改性技术与聚合物保温砂浆

采用适合于工业化大规模连续生产的热雾喷涂法技术制备了聚合物改性膨胀珍珠岩,与普通膨胀珍珠岩相比,改性膨胀珍珠岩的吸水率和强度等性能指标有了显著改善和提高.采用聚合物改性膨胀珍珠岩和多种聚合物改性剂的聚合物保温砂浆具有优越的性能,获得了热工性能和力学性能的最佳平衡,尤其适合于建筑外保温粘贴饰面砖的市场需求,得到了广泛的工程应用.     

喷涂油漆在薄金属表面燃烧特性研究

摘 要：通过锥形量热仪研究了喷涂油漆在薄金属表面的燃烧特性。选用35,50,65,80 kW/m2共4种热辐射强度,得到点燃时间、热释放速率、CO释放速率等参数。结果发现：薄金属表面油漆为典型的热薄型固体,点燃时间的倒数与热辐射强度呈线性关系。喷涂层数越多,引燃所需的热辐射强度越小,火灾危险性也越高,试验得到1层喷涂、2层喷涂和3层喷涂的临界热流强度分别约为30.8,10.0,5.0 kW/m2。热释放速率呈现出双峰特性,第一峰值和第二峰值随热辐射强度呈线性增长关系,且峰值随喷涂层数的增加而增加。CO释放速率则呈现出3个峰值。随着热辐射强度增加,各样品的火灾性能指数不断降低,火灾蔓延指数不断升高,火灾危险性增加。     

Development and Evaluation of Fire Barriers to Reduce Fire Hazards on large mining Equipment

The National Institute for Occupational Safety and Health has developed and evaluated various fire barriers for their effectiveness in preventing the spraying of pressurized hydraulic fluids onto simulated turbocharger hot surfaces, and in preventing the ignition of flammable vapors and mists onto barrier outer surfaces. This initial study, however, needs to be followed by a larger investigation that deals with barrier effectiveness in preventing or reducing hydraulic fluid fires within compartments of operating equipment, and barrier physical endurance under hostile environments within compartments. Some of the barriers were also evaluated for their effectiveness in suppressing simulated turbocharger fast-developing fires (initial fires, 32 kW). For the evaluation, modeled engine compartments with simulated turbocharger surfaces of 600°C, initial fires of 32 kW, and a pressurized hydraulic fluid spray system, were used. Also, conceptualized designs of some of the fire barriers, set within the compartments of typical mining equipment, have been reported to provide further guidance toward barrier fabrication and installation. The fire barriers included a parachute silica cloth barrier lined with flexible stainless steel foil; a one-panel insulated stainless steel barrier with a water-spray system; a foldable multi-panel insulated stainless steel barrier; and, an open–close steel strip barrier. Results show that all four fire barriers were effective in preventing the spraying of pressurized hydraulic fluids onto simulated turbocharger hot surfaces. Most of the barriers were also effective in preventing the ignition of flammable vapors and mists onto barrier outer surfaces. Results also show that the parachute barrier and the one-panel barrier with a water-spray system were effective in suppressing simulated turbocharger initial fires of 32 kW.     

液氨罐车车载水喷雾装置泄漏扩散及喷淋实验研究

设计并搭建了一套液氨车载水喷雾装置,用于研究液氨罐车操作箱内介质泄漏扩散规律和水雾抑制效果。首先,通过泄漏扩散实验对泄漏口的高度、泄漏方向和泄漏压力进行三因素三水平正交实验分析,研究各因素对氨气浓度分布的影响。实验表明：泄漏高度44 cm、泄漏方向朝上、泄漏压力0.3 MPa,操作箱内出现最危险工况,顶部氨气体积分数8.5 s内达到83.12%。其次,通过水喷雾抑制实验进行了喷嘴口径、雾化角度、喷水压力以及双喷嘴间距的四因素三水平正交实验分析,探索各因素对水雾抑制效果的影响规律。实验表明：各因素对水喷雾系统抑制效果影响的主次顺序:喷水水压＞喷嘴间距＞雾化角度＞喷嘴口径。水喷雾装置最优的选型方案为：喷嘴口径0.3 mm、雾化角度90̊、喷水水压10 MPa、喷嘴间距26 cm,采用该方案1.8 s内氨气浓度迅速抑制到2.16%,可显著降低爆燃风险。     

减缩剂喷涂工艺对水泥基材料的减缩效果

探讨了水泥基材料减缩剂喷涂工艺对水泥砂浆的减缩效果.结果表明:减缩剂喷涂对于水泥砂浆有很好的减缩效果.水泥砂浆脱模后在表面连续3 d喷涂3次30%(质量分数)的减缩剂溶液,1 d的减缩效果可以达到45%,28 d为22%.减缩剂喷涂工艺克服了内掺工艺影响水泥基材料强度的缺点,经喷涂减缩剂后的水泥砂浆抗压强度和抗折强度并未降低.另外,减缩剂喷涂工艺可减少减缩剂的使用量,降低成本.     

Exposure assessment of organic solvents for aircraft paint stripping and spraying workers

The main objective of this study is to investigate the personal or area exposure of organic solvents during paint stripping and paint spraying. Three aircraft paint stripping/spraying workplaces in Taiwan were selected, and the Council of Labor Affairs and NIOSH recommended sampling/analytical methods used in this study. Activated charcoal tubes were used to investigate the personal and area exposure concentration of organic solvents in paint stripping and paint spraying operations. During aircraft paint stripping, experiment results show that methylene chloride personal exposure concentration at the ground area, 42.01+/-31.86 ppm, is higher than that at the working platform 4 M high above the ground, 20.41+/-11.43 ppm. Exposure concentration of methylene chloride in the initial paint stripping operation stage of every workplace is over the PEL (50 ppm) set by the Taiwan Council of Labor Affairs. Corrective actions are needed. During paint spraying, concentrations of all organic solvents were found to be below the PEL of OSHA.     

Application of passive cooling systems in the hot and humid climate: The case study of solar chimney and wetted roof in Thailand

The thermal performance of two passive cooling systems under hot and humid climate condition is experimentally investigated. The experimental results were obtained from a test cell and a controlled cell with identical walls but different roof configurations. The passive cooling systems applied to the test cell are solar chimney and water spraying on roof. The experimental results obtained from the test cell are compared with the closed and no passive cooling controlled cell. In addition, the significant of solar-induced ventilation by using a solar chimney is realized by utilizing a wind shield to reduce the effect of wind-induced ventilation resulting in low measured air velocities to the solar chimney and low computed value of coefficient of discharge. The derived coefficient of discharge of 0.4 is used to compute Air Changes rates per Hour (ACH). The ACHs with application of solar chimney solely are found to be in the range of 0.16–1.98. The studies of air temperature differences between the room and the solar chimney suggest amount of air flow rates for different periods in a year. The derived relationships show that the air flow rate during February–March is higher than during June–October by 16.7–53.7%. The experimental results show that application of the solar chimney in the test cell could maintain the room temperature at 31.0–36.5 °C, accounting for 1.0–3.5 °C lower than the ambient air and 1.0–1.3 °C lower than the controlled cell. However, to make the test cell's room temperature much lower than the ambient temperature and increase the flow rate of air due to the buoyancy, the application of water spraying on roof is recommended together with solar chimney. The application of the two systems in the hot and humid climate are discovered to sustain the room temperature of the test cell to be lower than the ambient air by 2.0–6.2 °C and lower than the controlled cell by 1.4–3.0 °C.     

The droplet size and height effects in ammonia removal in a spray tower

Ammonia removal from lime treated sewage by spraying down through an unpacked air stripping tower was carried out on pilot plant scale. The effect of droplet size, tower height and tower geometry on ammonia removal was studied together with an instantaneous ammonia release obtained at the spraying nozzle, which was dependent on the nozzle design.