300MW“W”火焰锅炉叠梁吊装

东方锅炉厂引进福斯特惠勒公司技术生产的“Ｗ”火焰锅炉的大板梁采用叠梁结构，本文介绍了叠梁的吊装方案，为今后同类型锅炉板梁的安装提供借鉴。     

大容量锅炉叠梁的制造和安装要点

本文以东方锅炉设计制造的亚临界600MW机组“W”形火焰锅炉为例，对叠梁的制造和安装的要点进行了探讨。     

超临界600 MW锅炉大板梁吊装方案分析

对超临界600 MW锅炉叠大板梁分开吊装的可行性进行了分析,并对叠梁叠合面螺栓扭矩进行了计算。     

全跨无粘结混凝土梁抗力性能仿真分析

为进一步研究全跨无粘结混凝土梁的抗力性能,基于ABAQUS有限元软件,对全跨无粘结梁与完好梁的承载力及变形性能进行了仿真对比分析。结果表明,当全跨无粘结梁与完好梁的配筋方式及材料力学性能一致,受拉纵筋锚固良好且可进入屈服阶段时,全跨无粘结梁的极限承载力略高于完好梁,但钢筋有无粘结对混凝土梁的开裂荷载影响不大;混凝土开裂前全跨无粘结梁与完好梁抗弯刚度基本一致,但混凝土开裂后全跨无粘结梁的抗弯刚度明显小于完好梁,且其总变形量较完好梁大。     

采用环梁加固风机基础的有限元分析

讨论了采用混凝土环梁加固风机基础的可行性,采用有限元方法计算了不同环梁高度情况下风机基础的应力。研究显示,加高混凝土环梁对穿基础环孔钢筋应力和基础环侧壁应力的影响较小;当环梁高度大于500 mm时,基础环下法兰处的混凝土应力集中有所改善。文章的计算结果可为风机基础加固提供参考。     

预应力混凝土梁板后张法施工的探讨

随着预应力的发展,后张法预应力体系已经广泛应用于大型桥梁结构上,而桥梁工程中预应力混凝土梁板施工存在的问题已经不是一日形成的。基于后张法的实际应用,阐述了后张法预应力体系,分析了后张法混凝土梁板施工存在的相关问题,并从质量控制出发,重点以拉张阶段为前提,提出了后张法质量控制措施。     

岩锚梁混凝土施工期裂缝成因分析

针对岩锚梁混凝土结构施工期开裂问题,分析了产生混凝土不利应力的主要荷载,利用ANSYS、基于实测岩壁不均匀最大位移量进行了弹性有限元计算,并分析了计算结果.通过对岩锚梁有限元温度场和应力场的仿真计算与分析,获得了混凝土内的温度分布及其经时变化是引起开裂的主要原因.     

地下厂房岩锚梁结构温控防裂研究

由于施工段长度较长,混凝土标号较高、浇筑量较大,现代大型地下厂房中的岩锚梁结构较容易发生温度裂缝,影响结构安全稳定。对此,采用有限元法数值模拟了岩锚梁温度及应力场,并通过与实测结果的对比,验证了数值方法的有效性,在此基础上,采用数值模拟方法进一步研究了岩锚梁温度应力发展过程及主要影响因素。结果表明,最高温度是决定岩锚梁最大拉应力的主要因素之一,初期最高温度越高,后期降低至稳定温度时所形成的拉应力越大,开裂风险也越大。施工中应采取适当的温控措施降低最高温度,并合理控制分缝尺寸,以提高岩锚梁结构的抗裂安全。研究成果可为类似地下工程提供参考。     

对水平往复炉排梁尺寸标注的探讨

对水平往复炉排梁尺寸标注的探讨陈钦珠（石家庄市锅炉厂）众所周知，在工业锅炉生产厂，水平往复炉排梁（以下简称炉排梁）已作为通用件形成批量生产。目前，在机加工时，为使炉排梁达到ＺＢＪ９８０１０—８８标准规定的技术要求，由于工艺复杂而使生产效率很低。因此，...     

漫湾电站地下厂房岩壁吊车梁有限元计算

采用ABAQUS有限元计算软件，建立了地下厂房岩壁吊车梁运行期的有限元分析模型，分别计算了8种吊装工况下的模拟计算分析，超载模拟50％。计算分别给出吊车梁的内力和位移，以及吊车梁与围岩的开合值、锚杆的内力、围岩的位移，并与试验结果进行对比分析。通过计算分析，可以了解吊车梁的超载能力及安全稳定性，同时也为今后的吊车梁的设计提供帮助。     

糯扎渡水电站进水口叠梁门分层取水设施运行方式研究

鉴于糯扎渡电站进水口叠梁门分层取水设施的建设和运行管理缺乏经验,通过河道天然水温数据统计分析和水库水温分布结构预测,确定了糯扎渡电站进水口叠梁门分层取水设施的运行时段、运行水位、下泄水温的调控目标,并结合电站发电、防洪及航运等多目标水库运行要求,明确了进水口叠梁门分层取水运行方式,为电站投运后叠梁门多层取水提供了依据。     

水泵、节温器综合试验台的设计与应用

本文介绍了水泵、节温器综合试验台的设计与应用,论述了本试验台的设计依据、主要特点、构成及功能、实际应用等内容。本综合试验台的创新点在于：在该试验台上不仅可以完成发动机水泵的性能试验,还可以完成节温器性能和可靠性试验;而且更好的模拟了节温器在发动机上的实际使用状况,完美的将两者结合在一起,利用被试水泵作为供水泵完成了相配套的节温器试验内容。     

中国与美国用水总量统计方法及比较

为掌握现有的水资源状况,保证工业、农业和生活用水的可持续利用,需要对现有水资源量进行统计和规划。通过分析中国与美国供用水统计方法的发展情况,根据两国不同的工、农业和生活用水等方面的用水现状,分析了各用水户的供用水量统计方法。目前我国与美国由于用水户的用水量存在很大区别,特别是在火电用水、农业用水和生活用水方面,用水量统计方法存在较大差别。     

矿山断层突水原因分析及防水措施研究

通过对断层突水特性分析,总结断层突水的内部影响因素;通过对断层突水作业环境分析,总结断层突水的外部影响因素;根据矿山作业实际情况和断层突水特性,制定了矿山断层防水措施。     

大型链条炉排热水锅炉设计原则分析与探讨

本文通过对目前运行的大型链条炉排热水锅炉存在问题进行分析研究,并根据集中供热系统的运行特点,提出了大型链条炉排热水供热锅炉的主要设计原则,同时介绍了为解决近年来大型链条炉排热水锅炉在运行中出现的问题而最新开发的大型链条炉排热水锅炉新炉型.     

Analysis of a photochemical water splitting reactor with supramolecular catalysts and a proton exchange membrane

In this paper, a new type of photochemical water splitting system is proposed and analyzed. The system comprises two reactors in which photocatalytic half-reactions of water reduction and water oxidation are conducted. The two reactors are divided by a proton conducting membrane. Complex molecular devices based on ruthenium-(bipyridine)₃²⁺ photosensitizers are dissolved in both reactors, which generate electrons or holes when exposed to high energy photonic radiation, and act as catalysts for water splitting. The selected molecular devices for water reduction have a unique property to enhance the existence time of photoelectrons, such that the likelihood of generated electron pairs to produce a molecule of hydrogen is increased. In this study, the physical-chemical processes are analyzed and the main design parameters of the reactor are determined. The engineering design consists of a photochemical reactor, a mass flow controller to supply the fresh water, and two fans that extract the products of water splitting.     

Status and prospects of local solar heating and cooling systems

In this paper, a state-of-the-art of solar heating and cooling systems is presented. Solar air heaters and different types of solar water collectors are discussed in detail. Storage systems including water, rocks, and heat-of-fusion salts are described as are space heating systems employing solar air heaters, in conjunction with rock or heat-of-fusion salt storage, and the use of water collectors plus hot water storage for space heating and domestic hot water. An indication of the commercialization of various space-heating systems and broad economic projections are presented. The three major solar cooling methods—absorption cooling, solar mechanical systems, and those involving humidification-dehumidification cycles—are also discussed in detail. Finally, an overview of solar heating and cooling activities in Kuwait is also given.     

Recent progress on tungsten oxide-based materials for the hydrogen and oxygen evolution reactions

As a form of clean and renewable energy, hydrogen has received much attention recently. However, industrial hydrogen production is primarily via conversion of natural gas, which consumes a large amount of energy and emits large volumes of greenhouse gases. Electrochemical water electrolysis is a promising, pollution-free method for the production of hydrogen from water. Efficient, cost-effective, stable and abundant catalysts that can drive hydrogen production in water with minimal electrical bias are a major goal towards achieving electrolysis on a large scale. Recently, tungsten oxide-based materials have emerged as one of the most promising electrocatalytic compounds, due to their activity, low cost and durability in both acid and base conditions. There are often oxygen vacancies in metal oxides, whether intentional or not, which can potentially promote the water electrolysis. In this review, we provide an overview of tungsten oxide-based materials used for electrocatalytic water splitting. In addition, mechanisms to improve the electrocatalytic activities of oxygen vacant tungsten oxide are summarized and discussed, with proposals for future research. This review article will provide a valuable resource for scientists pursuing materials for electrochemical water splitting.     

引江济太工程调水效益评估

为了解引江济太工程的调水效益,采用分摊系数法、生产率变动法、水污染经济损失计算模型等方法,分别从经济、社会和环境三方面对调水效益进行量化,初步评估2010年引江济太调水为太湖流域受水区的经济、社会和环境带来的各种效益和影响。结果表明,2010年度引江济太调水综合效益约44.4亿元,工程调水效益显著。     

Interaction of hot water reservoirs and deep wells

A water reservoir and a deep water well producing from it constitute a hydraulic system connected in series. The prescribed amount of water to be produced most economically may be planned and withdrawn only if the elements of the system and the laws of their interaction are known. In the present paper the laws of interaction are given for production planning in the case of free flowing and airlift water production. Using a numerical example, the author demonstrates how the airlift of a water well producing gas-free water is to be planned with a minimum of specific air consumption.