组装集箱制造工艺优化

在原有的组装集箱制造工艺的基础上,又经过多个项目的生产实践,通过对组装集箱生产制造过程中出现的问题进行分析和总结,对其制造工艺进行了一些改进和优化,主要体现在对组装集箱装配工装的抗热处理变形能力和不锈钢拉撑定位板进行了改进,对管端的修正余量和管端复加工刀具进行了优化,对相应的部分制造工艺进行了调整。     

某电厂改造用缠绕管主要制造过程简介

本文针对某电厂改造用缠绕管的制造过程进行简单介绍,并结合制造过程对其结构、制造难点等方面进行了的详细介绍。     

催化裂化装置余热炉制造技术

主要对模块式余热炉的制造技术进行归纳和总结,对制造中的难点进行分析和说明。     

蒸汽过热器工艺制造技术精益改进

本文对蒸汽过热器的制造工艺及工艺流程方案进行了分析研究,并针对产品的重点、难点利用精益思想进行分析,总结提升了产品的制造质量,降低了生产制造成本,节约了生产制造时间。     

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.     

螺旋管屏制造技术浅析

本文在管屏宽度、制造公差、制造设备和螺旋倾角的控制等方面对螺旋管屏的制造技术进行了阐述。     

不锈钢冷渣器制造中的充氩保护技术

针对不锈钢冷渣器的制造技术进行归纳和总结,对制造过程中的难点进行分析和说明。     

锅炉旋流煤粉燃烧器制造技术改进与创新

针对锅炉旋流煤粉燃烧器技术要求高,形位公差精度要求严格,制造难度大等特点,通过对产品结构特点和影响成型质量的关键点进行总结分析,对制造工艺进行了优化改进,提高了产品制造质量。     

布风板管屏制造工艺措施

对布风板制造中遇到的问题以及采取的工艺措施进行了详细论述,根据近几年的生产制造经验,确定了管屏的制造工艺方案。     

汽轮机转子枞树型轮槽铣刀的制造研究

文了深入探讨．章在对枞树型轮槽精铣刀进行分析的基础上，结合实际生产经验，对其制造工艺流程、加工难点等问题进行并进一步对轮槽铣刀的关键加工技术进行了分析研究，制定出了合理有效的加工制造策略．为轮槽铣刀的加工制造提供了全面系统的技术参考．     

静止液体中浸没垂直导管口气泡形成实验

利用高速摄像技术研究气流通过浸没垂直导管口在液体中形成气泡的机理及其行为规律,分析导管内径、气体流量、导管口浸没深度和导管外径对气泡脱离直径的影响。结果表明:在导管内径分别为7、10和14 mm,气体流量在0~450 mL/s的条件下,气泡脱离直径随导管内径和气体流量的增加而增大;在浸没深度为0.05~1 m的条件下,导管口浸没深度对气泡脱离直径的影响很小可以忽略;当气体流量在100 mL/s以上,导管内径为10 mm、导管外径为14~26 mm时,随着导管外径的增加,气泡脱离直径减小。     

The effect of bottom reflectivity on the performance of a solar pond

The reflectivity of the bottom of a solar pond increases on account of the accumulation of dirt or the presence of undissolved salt. The effect of the reflection of the solar radiation at the bottom of the pond on the seasonal performance of the pond has been studied using a three zone model. The spectral reflectivity of dirt and common salt were measured in the laboratory and used in the analysis. The results obtained from the analysis show that the presence of dirt at the bottom of the pond does not affect the performance of the pond substantially. On the other hand, the presence of undissolved salt at the bottom of the pond results in substantial deterioration of the pond performance.     

基于Scada数据的风电场改扩建数值模拟研究

风电技术发展速度远高于风电场衰老速度,随着技术的不断进步,多数风电场可以进行有针对性的改扩建,并以此来最大化利用已有风电场内风能资源,增加经济收益。根据已建成风电场运行特性对风电场进行精细化设计是已建成风电场改扩建的关键。针对已建成风电场的Scada数据进行统计分析,了解风电场风能资源特征及运行特性,随后根据风电场风资源特征及运行特性,建立CFD模型,并通过对比风电场模型与风电场各机位点实际测风数据的误差,确认风电场CFD模型的精确程度,最后应用修正为自由流的已建机位点机舱测风数据进行模型修正,达到精准模拟风电场的要求,并以此来确定风电场改扩建排布方案,确保风电场发电量。工程实例的数据与结果分析表明了该方法的可行性。     

UASB处理养猪废水条件下进水浓度对污泥颗粒化的影响

通过进行废水浓度变化对污泥颗粒化影响的试验,发现：颗粒直径随进水浓度的上升而增大,受传质过程所能进入颗粒内部的营养量所控制.应根据COD去除率的情况适时提高进水浓度,及时地随微生物数量的增加补充营养,促进污泥颗粒化;避免了浓度变化太快引起细菌生长过快,污泥结构松散,沉降性能下降及COD去除率和产气率降低.     

Heat Transfer Coefficient from the Sheet-Piped Light-Absorbing Panels of the Flat-Plate Solar Water-Heating Collectors to the Heat Transfer Fluid in Their Heat-Removing Channels

It has been proposed to introduce a new parameter into the practice of the heat calculation and testing of the flat-plate solar water-heating collectors (FSWHCs)—the coefficient of heat transfer from the light-absorbing panel (LAP) to the heat transfer fluid in its internal heat-exchange channels (HECs) reduced to the unit area of the frontal surface of their cases. The mechanism of the formation of this parameter is studied, the design expression is derived, and a practical example of the calculation to define its value is performed. The structures of the flowing LAPs of a sheet-piped thin parallelepiped form are selected as the objects of the investigation. The reliability of the results of the investigations is proved by comparing the values of the specific (relative to the area unit of the frontal surface of the case) heating efficiency of the collector obtained based on the various formulas.     

背压微增条件下汽轮机出力的简化计算

为获得准确的背压微增条件下汽轮机出力特性,分析背压变化时机组热力系统变工况实际运行特性,基于对热力系统的合理假设和相关经验公式的应用,在忽略汽轮机本体结构和内部级组热力参数变化的前提下,提出了汽轮机背压微增出力特性的简化计算方法。以某300 MW湿冷机组和660 MW间冷机组的变背压工况性能试验数据为例进行验证,结果表明,简化计算获得的微增出力特性曲线的斜率和试验结果偏差在3%以内,是一种行之有效的背压微增出力特性高精度计算方法。     

Transition strategy of the transportation energy and powertrain in China

The problems of the transportation energy and environment are the major challenges faced globally in the 21st century and are especially serious for China. The future 20 years is the strategic opportunity period of the transition of the transportation energy and powertrain system for China. The greatest characteristics of hydrogen economy lie in its diversity of the primary energy source, the unification of energy carrier and the greening of energy transformation. Development of hydrogen energy transportation powertrain system is suitable for China from the views of the situation of Chinese resources and energy sources, the urban and rural layouts, the superiority of later development and the successful practices of clean cars and electric vehicle development projects. The transition of the transportation energy powertrain system includes three parts: the transition of the energy structure, the transition of the powertrain system and the transition of the fuel infrastructure. The technical pathways of energy powertrain system transition includes expending the use of gaseous fuel to prompt the multiform of the transportation energy and to prepare for the transition of the infrastructure simultaneously, developing and promoting the hybrid technology to solve the current energy and environment problems and to prepare for the transition of powertrain system, and focusing on the research and development and demonstration of fuel cell vehicles and the hydrogen energy technology to prompt the earlier formation of the market of fuel cell vehicles. The goal in the near and medium term of transition is to reduce the fuel consumption by 100 million ton in 2020 by substituting and saving, and the long-term goal is to setup the infrastructure of hydrogen and fuel cell vehicle as the main one replacing the petroleum internal combustion engine vehicle. In order to realize the strategic goals of the transition, the four-phases strategic periods and research and development activities are discussed and proposed.     

抽水蓄能电站甩负荷球阀动水关闭过程流固耦合研究

抽水蓄能电站甩负荷过渡过程中,内部流场与外部结构双向作用,对球阀安全运行造成不良影响。为探讨抽水蓄能电站甩负荷工况球阀动态关闭过程中流场演变对球阀关键部件的影响,基于流固耦合理论,建立球阀系统离散角度有限元仿真模型,以多角度结构分析近似模拟球阀在动水关闭过程中的结构瞬态过程,反映球阀流道的分布特点及薄弱环节的数据特征。为此,先对某抽水蓄能电站进行数值模拟,提取甩负荷过渡过程关键参数,根据仿真结果确定球阀流场边界条件;然后计算球阀流道内流场压力与速度分布;最后基于流场仿真结果建立球阀结构流固耦合模型,求解球阀瞬态过程结构强度相关参数分布。结果表明,甩负荷过渡过程中,在水流三维瞬变流动的影响下,球阀结构的应力分布具有明显规律性,工作密封与检修密封的过流面积突变,导致应力极大值出现在基座与枢轴部位。流场作用于球阀壁面的变形量叠加,球阀总变形量呈现由上游至下游逐渐递增的趋势。     

The influence of ibuprofen ((RS)-2-[4-(2-methylpropyl)phenyl]propanoic acid) additive on the structure ordering of coals of different rank during the process of co-pyrolysis

The mechanism of influence of the addition of 2 wt% of the expired pharmaceuticals (EPs) containing 80% of ibuprofen ((RS)-2-[4-(2-methylpropyl)phenyl]propanoic acid) on the transformation of the ordered structure of the three coals of different ranks was studied. The co-pyrolysates of coals with EP additive were studied with the method of X-ray diffraction (ХRD) and scanning electron microscopy (SEM). It was stated that the addition of 2 wt% of EP to all coals under study increases the intra-crystalline ordering. Under the influence of the addition of 2 wt% of EP at the stage of swollen grains of the co-pyrolysates of all coals, the amount of carbon ordered in crystallites decreases. In the co-pyrolysates of lower-rank coals (LRC) and higher-rank coals (HRC) under the influence of this additive at the stage of coke, the amount of the ordered phase decreases compared to the pyrolysates. In the co-pyrolysate of a medium-rank coal (MRC), the degree of ordering of coke does not change compared to the coke from single coal.     

Analysis of the influence of the current-voltage characteristics of the voltage rectifiers on the static characteristics of hydrogen electrolyzer load

Traditionally, the determination of static load characteristics is one of the main stages in the preparation of a design model of an electric power system. It is especially important to correctly take into account energy-intensive industries, which make a huge contribution to the formation of these characteristics. In particular, the increased interest in hydrogen technologies observed in the world as one of the most promising high-tech areas of energy development, and an increase in the share of the installed capacity of generation units based on renewable energy sources determine the prospects for the development of hydrogen production by water electrolysis. Accordingly, a significant increase in the scale of application of hydrogen technologies, in particular, in accordance with the “Hydrogen Strategy for Climatically Neutral Europe”, the European Commission for the production of “green” hydrogen, determines the task of forming correct mathematical models of these devices in terms planning of modes, analyzing their impact on the parameters of electric power systems. Determination of static load characteristics on the basis of a physical experiment will not allow obtaining a characteristic with a significant increase or decrease in voltage in the node of the electric power system, which occur only in emergency modes of operation of the power system. Therefore, it seems relevant to analyze and determine the electrical characteristics of consumers by mathematical modeling of the power circuit. This article presents the results of correcting the static load characteristic of a high-power electrolyzer used in the production of hydrogen. The analysis of these results obtained with the MATLAB software is carried out using least squares regression to procure polynomial functions of the static load characteristics. According to this analysis, the static characteristics of the considered electrolyzer, being close to linear within the control range, outside the control range acquire parabolic dependences of active and reactive power on voltage. The static load characteristics of the installation are determined by the parameters of the power circuit and the current-voltage characteristic of the rectifiers displacing the vertices of the parabolas from the origin, which should be taken into account to increase the reliability of the design scheme.