轴流式风机常见故障原因分析及处理方法

华电包头发电有限公司#1、#2锅炉装配的轴流式一次风机通过可转动叶片可改变其倾角来调节流量和风压,它是一种能在大范围负荷变化下进行调节的高效风机。对轴流式送风机常见故障的原因进行了分析,采取了相应的处理措施,取得了较好的效果。     

某大型火电厂一次风机失速原因分析及预防措施

某电厂锅炉配置2台动叶可调轴流式一次风机,投运后时常出现失速故障,严重影响了机组的安全运行。通过对机组一次风机的试验调整,分析了风机实际运行中产生失速的原因,从运行技术管理的角度提出了风机失速的预防和处理措施,供同类型风机操作人员在预防及处理一次风机失速时参考。     

轴流式一次风机失速分析及其预防措施

针对火力发电厂锅炉轴流式一次风机失速危害机组正常运行的现象，分析了轴流式一次风机失速产生的机理，提出了处理方法及采取有效预防措施，使轴流式一次风机脱离失速区，以避免事故的发生。     

桐梓电厂2×600MW机组工程引风机选型

对贵州华电桐梓发电有限公司2×600MW机组工程采用引风机与脱硫增压风机合并的可行性进行了分析,提出了合二为一模式和分别独立设置模式下的风机选型方案。对2种模式下风机的初投资和运行维护费用等进行了比较,对合并风机的选型以及引风机配置数量进行了论证。推荐该工程采用引风机与脱硫增压风机合并设置的方案,推荐合并风机采用动叶可调轴流式风机。     

SAF28－16型动叶可调轴流式风机动叶片的研制

论述了电厂用新型ＳＡＦ２８－１６型动叶可调轴流式风机动叶片的试制过程，着重介绍了喷焊叶片的仿形加工方法及质量控制和检验的内容。并与进口的同类叶片进行了比较，证明可完全替代进口叶片而在电厂推广应用。     

南水北调西线工程深埋长隧洞施工通风研究

根据南水北调西线工程的特点和深埋长隧洞施工设计方案,对掘进机施工通风的独头通风长度、施工通风模式、系统参数、机械选型、通风布置等进行了初步研究,指出:深埋长隧洞双洞布置洞段宜采用平行巷道式施工通风方案;双洞施工通风布置中,横通道间距为500~2 000 m,风机最大送风长度为4 000 m,优质通风管平均百米漏风率为0.55%~1.20%;风机应选用高效、低噪音的轴流式风机,风管应选漏风率低、耐久性强、安装方便的大直径软管。     

二龙山水电站轴流式水轮机增容改造

本文介绍了二龙山水电站轴流式水轮机改造的必要性和改造的目的要求,分析了两种改造方案的利与弊,介绍了选用JK412转轮的原因和应用效果。改造获得圆满成功,两台轴流式水轮发电机增容45%￣55%。     

锅炉一次风机故障原因分析

分析了一次风机在运行中出现的故障原因,通过计算和比较,确定风机轴承选型设计错误是造成风机不能正常运行的根本原因,提出了解决问题的具体方法,实施后一次风机运行效果良好。     

高压通风排烟在螺路隧洞中的应用

通风排烟作为长距离隧洞掘进过程中的一个重要环节，通风方案选择的合理与否，直接关系到隧洞掘进的速度及掘进的成本。文章重点介绍了螺路工程长距离小断面隧洞掘进中，通风排烟方案的选择，空压机高压通风排烟可行性分析，轴流式风机通风排烟与空压机高压通风排烟优缺点分析比较，为相同类型隧洞掘进通风排烟可起到借鉴和参考作用。     

响水风电场风机基础不均匀沉降原因及处理方法

在风电场建设运营过程中,风机基础沉降状况直接关系到风机吊装及运行过程中的安全性,其中不均匀沉降对风电场危害尤大.结合响水风电场部分风机基础不均匀沉降情况,对风机基础不均匀沉降原因进行了初步分析,并提出相关处理方案以供一起探讨.     

HYDRODYNAMIC CHARACTERISTICS AND OPTIMIZATION DESIGN OF EFFICIENT AXIAL-FLOW BLAST WITH LOW NOISE AND ENERGY SAVING

Based on the demand on efficient axial-flow blast with low noise and energy saving, a blade was designed through the application of the unequal work distribution principle and the exponential twisted camber was used to shape blades. Then, the hydrodynamic characteristics of blades were studied and the strengths and vibrations of blades and hydrodynamic noise of blast were analyzed. Furthermore, the software of optimization design of axial-flow blast was developed. Finally, the HMF-T40No.20 axial-flow blast used in large textile conditioner system of cotton spinning industry was designed, which could meet the required total safety and environmental requirements as the corresponding test demonstrates. The study is beneficial to designing axial-flow blast.     

15度斜式轴流泵装置水动力特性实验研究

15度斜式轴流泵装置是我国近年在低扬程、大流量泵站引入的一种新型泵装置,由于出水流道前端呈S形弯曲,流道内的二次流导致某些工况下压力脉动和振动较大,这一问题尚有待深入研究。本文针对浙江盐官泵站技术改造所研制的新型15度斜式轴流泵装置进行了水动力学特性的实验研究。研究发现,与泵段相比,斜式轴流泵装置的最优工况点向负叶片角度和小流量区偏移。泵装置在较小叶片角度下的空化特性优于大叶片角度;当装置空化余量低到使泵装置效率下降1%时,叶片背面出现占据近1/3叶道区域的空化区。斜式轴流泵的飞逸转速在较大负叶片角度时可达额定转速的1.73倍。斜式轴流泵压力脉动在导叶出口、出水弯管和出水流道内明显高于常规立式轴流泵;从水泵进口方向看,当叶轮逆时针方向旋转时,斜式轴流泵装置出水流道隔墩左侧流量大于右侧。本文研究成果为大型斜式轴流泵站优化设计和稳定运行提供了新的科学依据。     

单台轴流泵模型0°安放角的数值计算分析

作者针对一轴流泵模型,基于ANSYS CFX软件,选用标准k-ε和可伸缩壁面函数,在0°叶片安放角下,采用全六面体网格,通过网格无关性分析,选择合适的网格数,分别在定常和非定常条件下进行了多工况点的数值模拟和外特性计算.在此基础上,将数值计算结果与物理模型实验结果进行对比,分析两者的差异,为逐步认识轴流泵CFD数值计算的精度,更好地指导工程应用提供基础.     

DESIGN OF IMPLANTABLE AXIAL-FLOW BLOOD PUMP AND NUMERICAL STUDIES ON ITS PERFORMANCE

This article presents the design of a new implantable axial-flow blood pump. The special feature of the flow channel inside the blood pump is that the blood is driven by a big-small tandem impeller installed in the inner hole of the cylinder magnet of a brushless direct current motor. The inner hole makes the main flow channel possible, while the gap between the inner end of the stator and the outer end of the cylinder magnet gives the shape of the tributary flow channel. There is no motor magnet inside the main flow channel, therefore, more blood can pass through it. The gap of the tributary flow channel is very small, but the blood flow in it is not blocked. Thus, the efficiency is increased and the volume and weight of blood pump can be reduced greatly. The outer diameter, length and weight of the manufactured implantable axial-flow blood pump are 29.6 mm, 76 mm and 158 g, respectively. The impeller spins at the speed of 9000 rpm and can generate a pressure head of 100 mmHg and a flow rate of 8 L/min. In an animal experiment, the blood pump has been successfully applied as a Ventricular Assist Device (VAD) in the chest of a small cow. Besides, a mathematical model is established to simulate the flow inside an axial-flow blood pump of implantable VAD. The numerical studies on the performance of the implantable axial-flow blood pump are carried out by combining this mathematical model and the Fluent software. The numerical results agree well with those of experiments, with the maximum error less than 10%.     

Numerical analysis of cavitation within slanted axial-flow pump

In this paper, the cavitating flow within a slanted axial-flow pump is numerically researched. The hydraulic and cavitation performance of the slanted axial-flow pump under different operation conditio...     

大型双速全调节轴流泵及其应用

本文结合东江－深圳供水工程东江泵站技术改造，提出了双速全调节轴流泵及其优化选型数学模型和求解方法．在扬程变幅大的轴流泵站中，采用双速全调节新型结构轴流泵的应用实践表明，这种方式不仅技术上先进可靠，运行调节方便，而且具有高效节能，经济效益显著的特点．     

轴流式水轮机转轮叶片的强度和刚度分析

用ANSYS有限元分析方法对某轴流式水轮机的新老转轮叶片的刚度和强度进行了计算，对转轮叶片肩部的应力集中作了对比分析。     

OPTIMAL HYDRAULIC DESIGN AND CAD APPLICATIONS OF AXIAL FLOW HYDRAULIC TURBINE'S RUNNER

A method of the optimal hydraulic design and CAD application of runner blades of axial-flow hydraulic turbines are discussed on the basis of optimization principle and CAD technique in this paper. Based on the theory of fluid dynamics, the blade′s main geometrical parameter, working parameters and performances index of the blades and the relationship between them are analysed, and the mathematical model of optimal hydraulic design of axial-flow runners has been established. Through nonlinear programming, the problems can be solved. By making use of the calculation geometry and computer graphics, the distribution method of the singular points, and an CAD applied software, an optimal hydraulic design are presented.     

300MW机组低负荷停运增压风机的节能措施

介绍了引风机和增压风机的技术参数和性能,分析了在运行工况下停运增压风机的可行性,采取了停运脱硫增压风机且由吸风机串带脱硫系统的节能措施,取得了良好的经济效益。     

左江水利枢纽水轮发电机组的机型选择

介绍左江水利枢纽水轮发电机组的机型选择,结合电力系统稳定计算及本电站运行特点对贯流式和轴流式机组进行分析论证和经济比较,最终选择轴流转浆式机组。