采用刷子汽封提高汽轮机内效率

为了提高汽轮机的内效率;汕头万丰热电有限公司在50 MW汽轮机上全面使用刷子汽封,并获得了优异效果:除汽轮机效率提高1.57%外,还有效地提高了汽轮机的真空度,并大大减少了汽轮机机油进水.介绍了轴、隔板和叶顶刷子汽封结构参数的确定方法,计算了刷子汽封的效益,并评估了刷子汽封对凝汽器真空度的影响.     

基于C8051F单片机的钢丝断线检测装置

基于C8051F单片机的断线检测是一种低成本、并且容易实现的断线检测装置.介绍了该装置的测量原理、软件及硬件电路设计,试验结果表明,该装置具有很高的可靠性和适用性.     

平整机除尘设备的改进与创新

通过对平整机传统除尘设备的分析,指出被动除尘的不足之处,介绍一种新型刷辊旋转主动除尘方法,并对相关设备改进和创新进行探讨。     

45钢曲轴表面修复研究

通过热喷涂、冷焊、电刷镀3种修复试验对正火态45钢进行表面修复,根据其修复工艺及厚度,对各修复层的金相显微结构、维氏硬度、结合强度、耐磨性能等进行对比分析,结果表明:超音速镍基自熔性合金粉末喷涂层的结合强度相对较低,快速镍刷镀层的耐磨性能相对较差。     

刷镀镍对1Cr15Ni4Mo3N钢性能的影响

研究了刷镀镍对1Cr15Ni4Mo3N钢疲劳、氢脆等性能的影响.测定了1Cr15Ni4Mo3N钢刷镀镍镀层的结合力和显微硬度等镀层性能.并采用功能考核疲劳试验评价了刷镀镍修复后的衬套零件.结果表明:1Cr15Ni4Mo3N钢刷镀镍后可通过200h氢脆试验,氢脆性能合格;刷镀镍后疲劳极限下降36%,但可通过衬套的功能考核疲劳试验;刷镀镍镀层与1Cr15Ni4Mo3N钢基体具有良好的结合力,镀层硬度与1Cr15Ni4Mo3N钢相近.刷镀镍工艺可用于1Cr15Ni4Mo3N钢零件的修复.     

极压抗磨添加剂在Ni-P镀层表面的作用机理

利用球-盘摩擦磨损试验机全面地研究了润滑油极压抗磨添加剂硫化烯烃及磷酸三甲酚酯在Ni-P电刷镀层表面的作用效果,并利用X射线光电子能谱仪和俄歇电子能谱仪分析了各摩擦表面润滑膜的成分及结构,进而讨论了硫化烯烃及磷酸三甲酚酯在Ni-P镀层摩擦表面的作用机理。研究结果表明,润滑油中加入硫化烯烃时对Ni-P镀层有良好的润滑效果,但加入磷酸三甲酚酯时的润滑效果较差。     

Droplet: A virtual brush model to simulate Chinese calligraphy and painting

This paper proposes a virtual brush model based on droplet operation to simulate Chinese calligraphy and traditional Chinese painting in real time. Two ways of applying droplet model to virtual calligraphy and painting are discussed in detail The second droplet model is more elaborated and can produce more vivid results while being slightly more time-consuming. The novel feature of the proposed droplet virtual brush model successfully enables the simulation painting system to overcome the poor expressional ability of virtual brush based on particle system and avoids the complex evaluation of physical brush with solid model. The model, derived from the actual calligraphy and painting experience, due to the simplicity of the droplet operation and its powerful expressive ability, considerably improves the performance of the simulation system and maintains painting effect comparable with real brush by supporting special Chinese brush effect such as dry brush, feng and stroke diffusion.     

MS9001E燃气轮机透平密封改造

浙江镇海的300MW燃气—蒸汽联合联合循环电站由两台100MW的MS9001E燃气轮发电机组、一台100MW蒸汽轮发电机组及两台无补燃余热锅炉组成。燃气轮机由美国GE公司提供,机组起停机时用0#柴油,正常运行时燃用180cSt重油。其中#8燃气轮机(到性能改造前总运行时间37 290·5小时、启动8     

大型水轮发电机碳刷温度过高、打火原因分析及处理

针对某电站水轮发电机碳刷温度过高、打火缺陷情况,利用机组停机状态,对发现的异常问题应采取的措施:①集电环表面有凹坑,返厂重新进行车削,使集电环圆度、同轴度与环面粗糙度达到R2.5的标准要求.②对刷握座与刷架接触电阻偏大现象进行处理.③如集电环、刷架表面碳粉堆积引起接触电阻增大,对碳粉吸收装置进行优化,将其滤袋和振打电机...     

Optimizing Chain Topology of Bottle Brush Copolymer for Promoting the Disorder-to-Order Transition

The order-disorder transitions (ODT) of core-shell bottle brush copolymer and its structural isomers were investigated by dissipative particle dynamics simulations and theoretically by random phase approximation. Introducing a chain topology parameter λ which parametrizes linking points between M diblock chains each with N monomers, the degree of incompatibility at ODT ((χN)ODT; χ being the Flory–Huggins interaction parameter between constituent monomers) was predicted as a function of chain topology parameter (λ) and the number of linked diblock chains per bottle brush copolymer (M). It was found that there exists an optimal chain topology about λ at which (χN)ODT gets a minimum while the domain spacing remains nearly unchanged. The prediction provides a theoretical guideline for designing an optimal copolymer architecture capable of forming sub-10 nm periodic structures even with non-high χ components.