成组技术是适合中国国情的先进制造模式

从先进制造技术的发展入手,分析了先进制造技术和先进制造模式的相互关系,并通过成组技术(GT)与其它先进制造模式的比较,提出GT是适合中国国情的先进制造模式。     

IGCC气化炉制造过程中的质量检验要点

本文以某企业生产制造的气化炉为背景,对制造过程的问题进行总结,提出制造过程中的质量检验要点,为后期的产品制造提供一定的指导。     

洗涤塔关键制造技术

介绍了洗涤塔的主要结构及制造过程,着重叙述了设备制造过程中的内件制造、总体装配工艺,为相似类型立式压力容器的制造积累了经验。     

捷克动力工业发展统计

捷克动力制造工业发展情况如下:1945年开始制造3.2万瓩机组,1954年开始制造5和5.5万瓩机组,1961年起制造10和11万瓩机组,1970年起制造20万瓩机组,接着又设计、制造了30万瓩的机组,目前正在制造     

浅谈锅炉钢结构制造控制技术难点

本文通过对钢结构典型产品制造工艺制造过程和难点分析,阐述了锅炉钢结构制造中的下料、坡口制备、装配、焊接、校正、油漆等关键制造工艺过程和控制措施,从而保证钢结构制造质量,并为类似项目生产提供了经验。     

球形集箱制造工艺探讨

上海锅炉厂有限公司首次制造球形集箱.分析了球形集箱的制造难点,提出了相应的工艺方案与对策,详细介绍了球形集箱的制造过程,解决了球形集箱本体材料的选择、球面上钻孔、斜接管的制造和内部清理等关键技术问题.产品制造符合标准要求,合格出厂.     

1000MW等级核电单体式除氧器制造技术研究

本文介绍了1000MW等级核电单体式除氧器制造技术难点,简述了主要零部件制造工艺流程,重点阐述了制造过程中遇到的技术难点和质量控制措施,为此类大直径核电除氧器的生产制造提供一些有益经验。     

高水头抽水蓄能机组两瓣式蜗壳座环焊接制造技术应用研究

随着抽水蓄能机组不断向高水头、大容量、高转速方向发展,为了保证机组的高性能指标要求和轻量化结构设计要求,将大量采用新材料、新结构进行制造,增加了其制造难度.本文分析了高水头抽水蓄能机组两瓣式蜗壳座环的工艺结构及生产制造难点,并对制造难点提出了解决方案,形成了一套高水头抽水蓄能机组两瓣式蜗壳座环制造工艺方案和制造技术.     

900MW超临界直流锅炉制造工艺特点

90 0MW超临界直流锅炉与上海锅炉厂有限公司以往制造的锅炉产品相比 ,其省煤器、过热器、再热器及相应集箱的材料、结构和制造工艺除了尺寸较大之外无大的差异。此锅炉制造中最大的难点在于螺旋水冷壁 ,特别是其中过渡段的制造。介绍 90 0MW超临界直流锅炉制造工艺的一些特点 ,特别是螺旋水冷壁过渡段制造中的难点及应采取的措施     

我国交通运输设备制造业能源消费及用电分析

全面分析了交通运输设备制造行业能源消费现状和用电情况,同时分析了交通运输设备制造行业的能源消费特点,提出了促进我国交通运输设备制造行业节能节电的措施建议,可为推动我国交通运输设备制造行业的节电工作提供参考。     

Identifying the Effect of Tidal Height on Offshore Wind Speed Profiles

The rise and fall of the sea surface due to the tide effectively moves an offshore wind turbine hub through the wind shear profile. Offshore wind farms are being built around the coasts of Europe, including in the Baltic and the North Sea. Tidal ranges in the North Sea are greater than those in the Baltic, and the potential effect on the wind shear profile of the change in sea surface height is likely to be more significant. This article seeks to identify the effect of tidal height on the shear profile at a mast off the east coast of the UK where the maximum tidal range is 7 m. Definite evidence for the effect of tidal height on wind shear is presented, though the effect is small and there is considerable scatter in the data. Copyright © 2003 John Wiley & Sons, Ltd.     

燃料电池船舶舱内氢气泄漏爆炸的数值模拟研究

以燃料电池客船“Water-Go-Round”号为对象,利用FLUENT软件模拟燃料电池客船舱内管道发生氢气泄漏并引发爆炸的情况,研究不同舱室氢气点火爆炸事故的影响规律。结果表明：可燃氢气云被点燃后,爆炸超压波自点火位置向四周迅速传播,点火位置对超压波的分布影响较大;控制舱爆炸时,超压强度最大,对船体超压危害最大;乘客舱爆炸强度最小,但超压中心分布在乘客舱,超压对乘客造成的危害最大;船舶舱室燃烧火焰温度主要由可燃氢气云的分布决定,燃料电池舱的火焰衰减趋势基本相同;乘客舱受到的高温危害较低,船艏舱无燃烧火焰的高温危害。     

气缸盖机械加工工艺设计综述

本文结合近年来国内外内燃机行业发展的新趋势，对结构复杂的气缸盖从毛坯、基准的选择、面与孔的加工等基本问题进行了分析，并对气缸盖的工艺难点进行了分析和探讨。     

可变偏心距风力机应力应变特性研究

针对新型可变偏心距风力机,通过数值模拟及实验测试的方法,研究偏心距离对风轮、塔筒及侧偏调节机构受力的影响。结果表明,在来流风速增大的条件下,可变偏心距风力机通过增大偏心距可减小叶片受力,风轮向右侧偏心100 mm时叶片最大应力是未偏心工况的86%;随着偏心距离的增大,塔筒在俯仰方向受力增长趋势放缓,受风轮偏转角增大的影响,塔筒在侧弯方向受力处于持续增大的状态;在向右偏心距离增大的过程中,风轮侧偏调节机构应力及应变逐渐向右侧集中,最大应力、应变始终处于中间部位,结果验证了偏心距调节方式的可行性及安全性。     

Performances and acoustic noise of micro multi-blade fan

In this paper, the performances and the acoustic noise of the traditional type micro multi-blade fan were investi- gated experimentally and numerically, to optimize the specifications of the fan for the resident circumstances. The acoustic noise level decreases but the efficiency deteriorates slightly with the increase of the blade number of the impeller. Besides, the acoustic noise decreases with the increase of the distance between the impeller outlet and the volute tongue, in accompanying with the increase of the input and the deterioration of the fan efficiency.     

Experimental study of the vapour–liquid equilibria of HI–I2–H2O ternary mixtures,Part 1: Experimental results around the atmospheric pressure

In the framework of the massive production of hydrogen using the sulfur–iodine thermochemical cycle, the design of the reactive distillation column, chosen by CEA for the HIx section, requires the knowledge of the partial pressures of the gaseous species (HI, I₂, H₂O) in thermodynamic equilibrium with the liquid phase of the HI–I₂–H₂O ternary mixture in a wide range of concentrations up to 270 °C and 50 bar. In the first of these two companion papers, we describe the experimental device which enables the measurement of the total pressure and concentrations of the vapour phase (and thus the knowledge of the partial pressures of the different gaseous species) for the HI–I₂–H₂O mixture in the 20–140 °C range and up to 2 bar. This device is used to carry out a large set of experiments investigating various mixtures with optical on-line diagnostics (FTIR for HI and H₂O, UV–visible for I₂). This leads to the determination of the concentrations in the vapour phase for many experimental conditions, results of which are given in this paper. The companion paper (part 2) describes the experimental device which enables measurements of the total pressure and species concentrations in the vapour phase in the process domain.     

O形橡胶密封圈封油结构研究

对O形橡胶密封圈的密封机理、密封形式进行了介绍,并阐述了其封油结构设计要点。结合理论对J11系列涡轮增压器O形橡胶密封圈封油结构进行改进,减少了增压器润滑油泄漏的可能性。同时,为J8系列涡轮增压器封油结构的改进作了有益的探索。     

Performance assessment of some ice TES systems

In this paper, a performance assessment of four main types of ice storage techniques for space cooling purposes, namely ice slurry systems, ice-on-coil systems (both internal and external melt), and encapsulated ice systems is conducted. A detailed analysis, coupled with a case study based on the literature data, follows. The ice making techniques are compared on the basis of energy and exergy performance criteria including charging, discharging and storage efficiencies, which make up the ice storage and retrieval process. Losses due to heat leakage and irreversibilities from entropy generation are included. A vapor-compression refrigeration cycle with R134a as the working fluid provides the cooling load, while the analysis is performed in both a full storage and partial storage process, with comparisons between these two. In the case of full storage, the energy efficiencies associated with the charging and discharging processes are well over 98% in all cases, while the exergy efficiencies ranged from 46% to 76% for the charging cycle and 18% to 24% for the discharging cycle. For the partial storage systems, all energy and exergy efficiencies were slightly less than that for full storage, due to the increasing effect wall heat leakage has on the decreased storage volume and load. The results show that energy analyses alone do not provide much useful insight into system behavior, since the vast majority of losses in all processes are a result of entropy generation which results from system irreversibilities.     

电场作用下冷气泡行为试验研究

气泡的生成、成长、脱离和上升等行为均是决定电场强化传热机理的主要过程,为获得电场作用下气泡生长的动态过程,研究了电场作用下冷态氮气泡的行为特性,利用高速摄像机拍摄了不同电场强度下的气泡生长试验图像,并对气泡脱离形态、周期和速度及加速度进行对比分析。试验结果表明,冷态氮气泡沿着场强方向拉长,呈圆柱体形状脱离壁面,气泡的脱离周期、速度与场强成正比,而加速度与场强成反比。     

Economie d'énergie en trigénération

Trigeneration is defined as the production of three useful forms of energy—heat, cold and power—from a primary source of energy such as natural gas or oil. For instance, trigeneration systems typically produce electrical power via a reciprocating engine or gas turbine and recover a large percentage of the heat energy retained in the lubricating oil, exhaust gas and coolant water systems to maximize the utilization of the primary fuel. The heat produced can be totally or partially used to fuel absorption refrigerators. Therefore, trigeneration systems enjoy an inherently high efficiency and have the potential to significantly reduce the energy-related operation costs of facilities. In this paper, we describe a model of characterization of trigeneration systems trough the condition of primary energy saving and the quality index, compared to the separate production of heat, cold and power. The study highlights the importance of the choice of the separate production reference system on the level of primary energy saving and emissions reduction.