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本文浅述了沙角发电总厂A5机组汽水管道支吊架的运行现状和存在的问题 ,进行了四大管道管系应力校核计算分析及恒力弹簧吊架的载荷性能测试。在综合分析的基础上提出了支吊架调整方案 ,并进行了工程实施。 相似文献
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本文叙述了某燃气轮机发电厂1号机组余热锅炉再热器1出口至再热器2进口集箱支吊架的运行时状态和存在的问题,支吊架调整前,再热器1出口集箱垂直方向热位移异常,集箱一端向下热位移不足,另一端反向向上翘曲。支吊架在状态检查以及其应力校验、核算的基础上,通过综合性的研究分析提出了该管道支吊架的调整方案并且依据方案对再热器1出口集箱载荷设计偏大的2组支吊架进行了更换。热态复核检验结果为支吊架承载应力及热位移量正常,管道热位移量正常,管系应力合格,达到了整治目标。 相似文献
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通过对塔式锅炉的管道支吊架的介绍,概述了管道支吊架的分类和设计要求,阐述说明塔式锅炉各管道支吊架的设计要点.由于管道热位移大,布置紧凑,支吊架装置在设计安装时须因势利导,合理布置.列举了管道典型支吊的结构设计和安装注意事项,为同类项目的管道吊架的设计和安装提供参考. 相似文献
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坚持对管道支吊架进行监督和维护是保证管理和设备长期安全运行的重要措施,建立了电厂支吊架数据库对支吊架检修具有重要意义,广东大亚湾核电站非常注意安全生产,建立了常规岛支吊架数据库,确定了各系统支吊架检修周期,程序和内容,实现了支吊架维护的计算机化管理。 相似文献
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刘志华 《中国锅炉压力容器安全》2009,(3):16-19
本文介绍了管道支吊架的类型及其失效对电厂管道系统安全运行的影响,重点分析了在新建机组的调试过程中容易引起管道支吊架失效的原因,并提出了预防支吊架失效的措施及建议。 相似文献
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《热能动力工程》2016,31(8)
锅炉蒸汽管道是锅炉汽水管道系统中承受蒸汽温度和压力的重要部件之一,高温高压造成蒸汽管道蠕变产生宏观位移,同时导致弹性支吊架产生形变,影响火电机组的安全运行。本研究针对弹性支吊架与锅炉蒸汽管道的结构关系,提出一种间接在线测量管道位移的方法。该方法先在弹簧支吊架下节选取两个标志点,再以锅炉管道中心线为Y轴建立世界坐标系,利用2个平行安置的高清摄像机实时在线采集图像,通过双目视觉获取标志点在所建坐标系中的空间坐标,由这两点建立弹簧支吊架下节所在直线的直线方程,联立蒸汽管道的圆柱体曲线方程,得到二者的交点,根据该交点坐标的变化实时计算出管道在X、Y、Z 3个方向的宏观位移。利用试验对测量方法进行了验证。试验结果表明,该方法获得的管道在X、Y、Z 3个方向宏观位移数据的不确定度分别为ux=0.10 uy=0.09 uz=0.12,不确定度越小,表明测量的位移越准确,且实现该方法的系统装置易于安装。 相似文献
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蒸汽管网模拟优化技术应用 总被引:1,自引:0,他引:1
洛阳分公司蒸汽管网包括10MPa、3.5MPa、1.0MPa和0.3MPa共4个等级.其中3.5MPa和1.0MPa蒸汽管网是主要管网。两套管网均存在供汽结构不合理,管段散热损失大,管网保温材料老化及破损严重,管段外表面温发较高(在50℃以上,局部管段超过80℃)等问题。为此.根据3.5MPa和1.0MPa蒸汽管网平衡数据.作出流量平衡表.利用蒸汽管网模拟分析软件(SNAMER)建立蒸汽管网模型并进行离线模拟分析。根据模拟分析结果,提出增设一条蒸汽跨线,以提高1号汽轮机发电机入口压力和汽轮机输出功率;将热电站至化纤装置3.5MPa蒸汽母管管径改为DN500,以减少压降;将部分管线保温材料改为硅酸铝镁纤维,保护层材质改为镀锌铝皮.以减少散热损火。模拟结果显示,实施上述措施后,1号汽轮机发电机入口压力约提高0.3MPa,在耗汽量不变的情况下,输出功率可提高3%:3.5MPa年1.0MPa蒸汽管网总散热损失将分别下降24%和31%;若对部分管线进行改造,每年将节约费用500万元。 相似文献
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Steam pipelines applied in power units operate at high pressures and temperatures. In addition, to stress from the pipeline pressure also arise high thermal stresses in transient states such as start-up, shutdown or a load change of the power unit. Time-varying stresses are often the cause of the occurrence of fatigue cracks since the plastic deformations appear at the stress concentration regions. To determine the transient temperature of the steam along the steam flow path and axisymmetric temperature distribution in the pipeline wall, a numerical model of pipeline heating was proposed. To determine the transient temperature of the steam and pipeline wall the finite volume method (FVM) was used Writing the energy conservation equations for control areas around all the nodes gives a system of ordinary differential equations with respect to time. The system of ordinary differential equations of the first order was solved by the Runge-Kutta method of the fourth order to give the time-temperature changes at the nodes lying in the area of the wall and steam. The steam pressure distribution along pipeline was determined from the solution of the momentum conservation equation. Based on the calculated temperature distribution, thermal stresses were determined. The friction factor was calculated using the correlations of Churchill and Haaland, which were proposed for pipes with a rough inner surface. To assess the accuracy of the proposed model, numerical calculations were also performed for the thin-walled pipe, and the results were compared to the exact analytical solution. Comparison of the results shows that the accuracy of the proposed model of pipeline heating is very satisfactory. The paper presents examples of the determination of the transient temperature of the steam and the wall. 相似文献
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叙述了燃煤热电厂主蒸汽管道、热再热蒸汽管道、冷再热蒸汽管道、高压给水管道(四大管道)和支吊架构建的管道监测系统的结构、数据处理、模型组建以及系统模块的研发路径.介绍了现场应用三维可视化技术、管道设备在线监测和状态计算,取得的成功经验和应用效果.实时数据的接入和有限元计算的程序化,使原有的静态档案式管理模式提升为实时动态... 相似文献
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《International Journal of Heat and Mass Transfer》2006,49(15-16):2420-2436
A substantial increase of the concentration of non-condensable gases in the mixture with steam can occur in a non-vented pipeline due to the condensation. This phenomenon is investigated with the thermal-hydraulic and physicochemical code HELIO. The hydrogen and oxygen accumulation is simulated and analyzed for a real non-vented steam pipeline of the nuclear power plant. The results show the propagation of non-condensables concentration front, the temperature and velocity field of the steam–non-condensables mixture, and the velocity and thickness of the condensate that drains on the pipeline’s inner walls. The gas mixture temperature is verified with measurements from a full size test facility. The presented modelling approach and numerical results are unique regarding the simultaneous solution of the heat and mass transfer in the system consisting of the steam–non-condensable gases mixture and the thin liquid film on the pipe’s wall. 相似文献
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按照管道加工工艺的不同,管道可分为内径控制管和外径控制管。通过热轧工艺生产的外径控制无缝钢管,可满足火力发电厂汽水系统中绝大部分管道的使用要求。对于超(超)临界机组的主蒸汽和高温再热蒸汽管道采用的P91/P92材质的大口径厚壁无缝钢管,由于对材料性能和加工工艺有特殊要求,因此宜采用内径控制管。 相似文献