透平膨胀机运行异常原因与应对措施

透平膨胀机更换新的叶轮转子部件及石墨气封后,重新启动运行时,出现了间歇性无规律异响和振动值增大的现象,且随着膨胀机转速不断提高,异响和振动值不断增大。加强监控透平膨胀机的振动值,直到故障消失,平稳运行。介绍故障发生时透平膨胀机的运行参数和整个故障过程,最后总结了此次故障分析和处理过程中得到的经验。     

气体轴承透平膨胀机常见故障分析和处理

叙述了空分设备所配套的风机制动气体轴承透平膨胀机在生产过程中出现的常见故障,并分析了透平膨胀机常见故障产生的原因和应采取的处理措施。     

低温氦透平膨胀机转子临界转速求解

针对EAST低温氦透平膨胀机开启问题,对传统Riccati传递矩阵法进行了改进,利用Matlab强大的矩阵计算能力,结合PRO/E和CAD软件,综合考虑了影响转子临界转速的各种因素,编写出了高精度的计算程序,分析了EAST启动透平膨胀机B过程中转速随阀门开度和叶轮进口压力的变化曲线和实验数据,计算得出了透平膨胀机B转子的临界转速,为后来试验开启透平膨胀机和进行氦透平转子稳定性研究提供了理论依据。     

一起透平膨胀机故障的原因分析及处理

分析了透平膨胀机损坏的原因,介绍了处理措施,通过增加一电磁阀控制气体进透平膨胀机和分馏塔的流路,以杜绝此类故障的发生。     

日立公司制作的透平膨胀机的国产化改造

河南平顶山市中国神马帘子布集团公司两套日立公司制作的透平膨胀机，在使用的过程中有时会出现故障，从国外进口备件不仅人格昂贵，而且周期很长。前几年透平机曾几次卡机，公司请了多家专业生产厂家进行修复，未参从根本上解决问题，长期以来机器带病工作，有时会严重影响公司正常生产，鉴于上述情况，决定对该设备的透平膨胀机进行彻底的国产化技术改造，从运行实况表明，自行设计改造的透平膨胀机，不仅结构紧凑合理，装拆方便，     

一起透平膨胀机设备故障的排除

新钢气体厂24000 m3/h空分设备配套的1台透平膨胀机,在正常运行过程中突然发生叶轮、主轴、轴承和密封器等设备损坏故障,分析了故障原因,并阐述了处理措施。     

空气轴承透平膨胀机失稳的故障分析及预防

作者在成功使用空气轴承透平膨胀机的基础上,总结出引起透平膨胀机卡机故障的三个原因,并介绍了预防措施;最后介绍了一种空气轴承透平膨胀机防喘振、卡机的安全装置。     

采用不同损失模型的低温透平膨胀机性能分析

针对氦气低温透平膨胀机变工况热力性能预测,研究了透平膨胀机各通流部分损失机理,并根据一维无量纲流动控制方程,采用基于焓降的损失系数分析了各部件内流动损失,结合各部件流动特性,确定了适合各通流部件的损失系数计算关联式,进一步开展了氦低温透平膨胀机变膨胀比和变转速的热力性能模拟研究,绘制了透平性能曲线,获得了透平膨胀机变膨...     

160万m~3/d天然气透平膨胀机的研制

介绍了160万m3/d天然气透平膨胀机的设计参数和运行参数,重点分析了透平膨胀机设计中遇到的问题及解决措施,调整设计参数和运行参数后,透平膨胀机运行性能良好,最后总结了天然气透平膨胀机设计中的经验教训。     

YPHe-100型氦液化装置的调试

本文介绍了国内首次试制的配有气体轴承透平膨胀机的 YPHe-100型氦液化装置流程、各机组设计情况,以及调试过程中透平膨胀机、预冷器、液化器、热交换器等出现的问题和改进措施。文中还对装置调试情况作了分析,并对装置优缺点进行了小结。图3,表5。     

低温氦气体轴承透平膨胀机的设计

针对我国氦透平膨胀机的研制任务，设计了一台氦气体轴承透平膨胀机。从机械性能方面就该氦透平膨胀机开展了理论与试验研究，以高稳定性为主要目标进行了氦透平膨胀机的结构设计，实现了绝热及密封、快速装拆等要求。氦透平常温、低温实验证明该机具有良好的热力性能及机械性能，本文侧重于对该氦透平膨胀机结构设计的探讨。     

应用于透平机械的相似模化方法评述

为解决氦透平膨胀机的相似模化试验问题，本文首先总结了以往选取透平机械相似准则的方法，进而对这些选取相似准则组织透平机械模化试验的各种方法进行了评论，其中重点评术透平机械中应用具有不同绝热指数的工质进行模化试验的多种方法，为研究以空气代替氦气进行氦透平膨胀机性能试验的问题奠定了基础。     

高温气冷堆能量转换气轮机基本特性的研究

高温气冷堆气轮机循环被认为是将来核能发电领域中最有潜力的方案之一。本文试图将高温堆气轮机循环中各种循环方案总结归纳为几种典型的循环,再将这几种典型循环从理论上抽象为氦气、氮气和空气布雷登循环并进行优化。然后针对这三种循环中的气轮机从热力学和气体动力学角度进行广泛的研究,得出氦气、氮气和空气气轮机的基本特性。     

Effect of rotation on the flow behaviour in a high-speed cryogenic microturbine used in helium applications

The complex flow characteristics in a high-speed helium microturbine used in cryogenic refrigeration and liquefaction cycles are highly influenced by the effects of rotation. In order to enhance the turbine performance and to improve the preliminary design process of the turboexpander, the flow characteristics within the turbine blade passage need to be investigated at different rotational speeds. Here, three-dimensional unsteady flow analysis of a high speed cryogenic microturbine used in helium applications was carried out using Ansys CFX^®. The loss generated by the various secondary and vortical flows for the different cases was quantified in terms of entropy loss coefficient. The loss generating mechanism was also assessed by analysing the velocity vectors, entropy contours and the behaviour of the vortex cores. With change in speed the influence of scraping flow due to relative casing motion and the blade loading on the flow characteristics was found to vary significantly. At lower speeds, the scraping flow decreases and thus augments the tip leakage flow which in turn interacts with the suction side leg of the leading edge vortex to form a single large vortex. This combined vortex increases the velocity defect and thus leads to increased loss generation. The analysis of the vortex core velocity and the blade loading diagram revealed the need for modifications in blade profile for improved turbine performance. Furthermore, the comparison of the CFD results with the Balje's n_sd_s chart showed remarkable variations, the results of which can be used to modify the chart for the design of efficient cryogenic microturbines for helium applications.     

EAST低温系统俄制氦透平膨胀机维修改进与测试

EAST氦低温系统是EAST( Experimental Advanced Super-conducting Tokamak)先进超导托卡马克实验装置重要子系统之一,4台不同进口参数的氦透平膨胀机又是EAST氦低温系统的核心部件,4种类型的氦透平膨胀机全是俄罗斯进口的氦透平膨胀机,其启动过程稳定差,易损坏.主要对俄制损...     

Flow field analysis of high-speed helium turboexpander for cryogenic refrigeration and liquefaction cycles

Turboexpander constitutes one of the vital components of Claude cycle based helium refrigerators and liquefiers that are gaining increasing technological importance. These turboexpanders which are of radial inflow in configuration are generally high-speed micro turbines, due to the low molecular weight and density of helium. Any improvement in efficiency of these machines requires a detailed understanding of the flow field. Computational Fluid Dynamics analysis (CFD) has emerged as a necessary tool for the determination of the flow fields in cryogenic turboexpanders, which is often not possible through experiments.In the present work three-dimensional transient flow analysis of a cryogenic turboexpander for helium refrigeration and liquefaction cycles were performed using Ansys CFX®, to understand the flow field of a high-speed helium turboexpander, which in turn will help in taking appropriate decisions regarding modifications of established design methodology for improved efficiency of these machines. The turboexpander is designed based on Balje's n_sd_s diagram and the inverse design blade profile generation formalism prescribed by Hasselgruber and Balje. The analyses include the study of several losses, their origins, the increase in entropy due to these losses, quantification of losses and the effects of various geometrical parameters on these losses. Through the flow field analysis it was observed that in the nozzle, flow separation at the nozzle blade suction side and trailing edge vortices resulted in loss generation, which calls for better nozzle blade profile. The turbine wheel flow field analysis revealed that the significant geometrical parameters of the turbine wheel blade like blade inlet angle, blade profile, tip clearance height and trailing edge thickness need to be optimised for improved performance of the turboexpander. The detailed flow field analysis in this paper can be used to improve the mean line design methodology for turboexpanders used in helium refrigeration and liquefaction cycles.     

高压氦风机的主要技术特点及运行情况

介绍了用于高压氦气试验回路的二级涡轮式氦气循环风机，由于采用了平衡结构、气动轴承、置入式电机、抽气冷却和交直流机组调速等手段，该风机具有轴向推力小、无油、无动密封、不引入其它介的南和调速方便等特点，本文将这些特点和高温气冷堆一回路氦气风机的技术要求作了比较。     

10MW高温堆气体透平方案初探

讨论了10MW高温气冷实验堆（HTR－10）气体透平总体方案设计中应考虑的主要因素。根据HTR－10及一期工程的特点,介绍了HTR－10可能的气体透平方案,初步探讨了直接循环和间接循环的特点。对一种可能的间接循环方案进行了总体设计方案的初步研究。该方案能够比较全面地研究氦气透平的特性,同时与HTR－10一期工程较容易衔接。     

PLPHe-9.3/9-0.3型氦透平膨胀机的新工艺开发与设计

介绍PLPHe-9.3/9-0.3型氦透平膨胀机结构及其特点,提出了运用精雕新工艺完成叶片的铣制加工等新工艺的开发与设计思路、实施过程和效果,为其他小型透平膨胀机的零件加工提供了一种新的工艺加工方法。