安康水电厂3~#水轮机尾水管抗磨蚀处理

针对安康水电厂水轮机尾水管磨蚀破坏情况进行了分析 ,提出了利用喷涂技术进行抗磨蚀处理的方法。结合安康水电厂的实际情况 ,对喷涂材料、喷涂方法进行了试验和研究 ,最终选出最佳方案     

50 年来水力机电研究领域发展与回顾

50年来,中国水利水电科学研究院水力机电专业经过几代人的艰苦努力,研发能力得到极大的提高。在水力模型开发、测试技术和相关基础理论研究等方面取得了可喜的进展,目前是我国唯一专门从事水力机械应用基础和关键技术研究的国内外知名科研机构。本文从测试技术、机电装备技术和数值模拟技术3个方面,概述了我院近50年来在水力机电研究领域的发展过程和主要成果;回顾了水力机电研究领域建立、健全和成长的历史。最后简要阐述了水力机电研究领域今后的研究重点和发展方向。     

Autothermal hydrogen generation from methanol in a ceramic microchannel network

In this paper, the authors present the first demonstration of a new class of integrated ceramic microchannel reactors for all-in-one reforming of hydrocarbon fuels. The reactor concept employs precision-machined metal distributors capable of realizing complex flow distribution patterns with extruded ceramic microchannel networks for cost-effective thermal integration of multiple chemical processes. The presently reported reactor is comprised of five methanol steam reforming channels packed with CuO/γ-Al₂O₃, interspersed with four methanol combustion channels washcoated with Pt/γ-Al₂O₃, for autothermal hydrogen production (i.e., without external heating). Results demonstrate the capability of this new device for integrating combustion and steam reforming of methanol for autothermal production of hydrogen, owing to the axially self-insulating nature of distributor-packaged ceramic microchannels. In the absence of any external insulation, stable reforming of methanol to hydrogen at conversions >90% and hydrogen yields >70% was achieved at a maximum reactor temperature of 400 °C, while simultaneously maintaining a packaging temperature <50 °C.     

混流式水轮机全流道三维几何数字化造型

针对混流式水轮机叶片形状复杂给三维实体造型带来的困难,借助于CAD软件中的水轮机二维图形,在Unigraphics软件平台下对水轮机全流道过流部件的三维数字化进行造型.研究结果表明,该模型与实际情况基本吻合,可供设计参考.     

Improved configuration of supported nickel catalysts in a steam reformer for effective hydrogen production from methane

The heat and mass transfer characteristics in a steam reformer are investigated via experimental and numerical approaches and a new configuration of packed catalysts is proposed for effective hydrogen production. Prior to the numerical investigation, parametric studies are carried for the furnace temperature, steam-to-carbon (S:C) ratio, and gas flow rate. After validation of the developed code, numerical work is undertaken to determine the relationship of the operating parameters. Based on the experimental and numerical results, and with the goal of obtaining optimum heat transfer characteristics and an efficient catalyst array, a new configuration for the packed bed is proposed and numerically investigated taking into account the endothermicity of the steam reforming reaction. A bed packed repeatedly with inert and active catalysts is found to be an efficient means to obtain the same, or better, hydrogen production with small amounts of the active catalysts compared with a typical steam reformer.     

汽轮机安装中心基准线的确立

介绍了３种汽轮机基准线的确立方法，主要阐述了采用激光找中方法所能解决的装配中出现的难点。     

Prediction of oxide scale growth in superheater and reheater tubes

In this paper a procedure on how to estimate the oxide scale growth in superheater and reheater tube utilizing the empirical formulae and the finite element modeling is proposed. An iterative procedure consisting of empirical formulae and numerical simulation is used to determine scale thickness as both temperature and time increase. Results of the scale thickness over period of time for two different design temperatures of the steam and different heat transfer parameters are presented. The procedures may provide better estimation on the oxide scale growth, provided that all the heat transfer parameters are well specified.     

评<中德合作三门峡电站抗磨研究与技术改造>

三门峡水轮机是由于水中泥沙引起的汽蚀所造成的快速破坏。《中德合作三门峡电站抗磨研究与技术改造》用轴面流速来计算磨损率是概念性错误 ,它仅仅用转轮室水平面积的增大 ,而不考虑过机流量的增大来计算磨损率 ,因此其磨损率不是减小了 ,实际是增大了。它删改了C 伊尔盖斯的磨损率计算公式用以解释水轮机破坏是不应该的。因为三门峡水轮机是个汽蚀破坏问题 ,所以采用抗磨涂层既无用而且还有害     

Development of advanced technology for biomass combustion—CFD as an essential tool

Major advances have been made in the development of bagasse combustion technologies and understanding the many processes involved in bagasse combustion and steam generation. CFD modeling has come to form an integral and critical part of this progression. The experience with CFD in the sugar industry through Sugar Research Institute has encompassed the full range of applications from fundamental code development, through the generation and commercialization of new ideas and technologies, to the resolution of practical plant problems. The paper summarises the numerous applications where SRI has achieved successful results utilizing CFD. It is demonstrated that the full benefits of CFD in the delivery of commercial outcomes, for new technologies and the solution of operating plant problems, are achieved through the close interaction between the code development and validation via full scale plant simulation. This two-way interaction enhances the code fundamentals by focusing on practical issues and similarly increases the confidence in the capabilities and accuracy of the CFD predictions, to an extent that justifies firm engineering decisions on commercial plant based solely on the characteristics predicted by the code.     

前郭石化烟气轮机结垢问题及处理措施

介绍了中国石油前郭石化公司100×104t/a重油催化裂化装置烟气轮机在运行中出现的结垢问题,分析了结垢原因,包括降烯烃催化剂的使用、烟气中催化剂粉尘的存在、反再系统操作波动和烧焦效果不好,并给出了应对措施和处理方法。