共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
对上海汽轮机厂有限公司生产的2种超超临界660 MW机组三缸两排汽及四缸四排汽汽轮机从本体、技术经济指标、汽轮机房尺寸等几个方面进行了比较。结果表明,三缸两排汽汽轮机比四缸四排汽汽轮机少1个低压缸,汽轮机制造成本将降低;两者总换热面积基本相同,三缸两排汽汽轮机凝汽器横向尺寸较大;额定工况下,四缸四排汽汽轮机具有内效率较高,热经济性较好的特点,但在低负荷时,三缸两排汽汽轮机的效率更高;四缸四排汽汽轮机比三缸两排汽汽轮机可节省土建费用922万元。对机组选型提供了推荐意见。 相似文献
5.
常规工业汽轮机通常配置快速关闭进汽阀,以实现汽轮机紧急停机。某负压进汽凝汽式汽轮机进汽参数低,进汽蒸汽容积流量大,且汽轮机进汽端和排汽端的压差小。为减小进汽压力损失,不设置新汽速关阀,而是在汽轮机排汽端采用冗余的大通径快速真空破坏阀。当汽轮机需要紧急停机时,打开快速真空破坏阀,使大气快速进入汽轮机排汽端,汽轮机排汽端的压力迅速上升。针对所研究的进排汽压差为40 kPa的汽轮机组,最短可在4 s内实现汽轮机进汽端和排汽端压差为0,使汽轮机刹停,达到汽轮机紧急停机的目的。 相似文献
6.
大型汽轮发电机组的可靠性对经济发电是极为重要的。叶片振动的测量是一种重要的设计手段,而在运行中监视叶片振动,可以对预防性检修起指导作用,这是提高可靠性的主要措施。本文介绍一家汽轮机制造厂在为更好地测量低压汽轮机动叶片的动力特性所做的不断努力中,振动测量仪器和试验技术的发展。威斯汀豪斯电气公司目前设计的1800转/分汽轮机低压叶片最长达44英寸(1118毫米),3600转/分汽轮机的低压叶片最长达31英寸(787毫米)。由于蒸汽进出口(进汽口、排汽口和抽汽口)和静叶片偏差的影响,沿圆周方向的汽流分布总不是十分均匀的。这使动 相似文献
7.
凝汽器是构成电站热力循环的主要设备之一,其作用是将汽轮机排汽冷却凝结成水作为锅炉的给水循环使用,并在汽轮机排汽口建立并维持高度真空。为了保证凝汽设备的正常运行,必须经常系统地对其运行特性进行监督,以便及时发现问题, 相似文献
8.
一、凝汽器的优化设计近代大功率汽轮机凝汽器的设计工作已成为整个发电站设计的一个重要组成部分。正如国际电工行业工程师们通常所说的“冷端的最佳设计”或“尾部最佳参数的选择”。优化的任务可归纳为把冷却系统(包括冷却塔、供水管道、循环泵和土建施工等)、汽轮机低压缸(包括排汽面积、排汽口数目及末叶片高度等)、 相似文献
9.
10.
11.
The characteristics of well-known designs of steam noise silencers are analyzed. New steam noise silencers designed at Moscow Power Engineering Institute (MEI) are described, and results of tests of them carried out at different facilities are presented. It is shown that the MEI silencer can be used in a wide range of dump steam parameters and be applied in power units for both subcritical and supercritical steam conditions. 相似文献
12.
介绍小孔消声器在电厂蒸汽放空时的消声作用、效果及其阀门流量的适配,分析ZF416型消声器的流量-驻压特性曲线及其阀门结构的选择。 相似文献
13.
14.
Specific features of noise reduction in the exhaust part of a gas turbine unit are considered. A method is developed for calculating the optimal flow cross-sectional area of an absorption silencer installed in the path of a gas turbine unit. The effect of various factors on selection of the silencer’s optimal design is analyzed. 相似文献
15.
16.
汽轮机内湿蒸汽测量系统研究 总被引:1,自引:0,他引:1
火电厂汽轮机内湿蒸汽的存在对汽轮机经济、安全、可靠运行造成了严重的影响。以汽轮机内蒸汽湿度的准确测量为目的,设计了以微处理器MSP430为处理核心的测量系统,包括自动频率跟踪系统和等精度频率测量系统。自动频率跟踪系统的跟踪频率达到2.44 kHz,等精度频率测量系统在标准频率为10 MHz时,分辨率可达到10-7,通过仿真验证,这两部分的设计能够使湿蒸汽测量的精度达到0.4%,甚至更小,证明方案具有可行性,满足系统需要。 相似文献
17.
太原第一热电厂16 号机组在额定工况下运行时,机侧电动主汽门前的三通噪声很大,噪声级高达116dB 。由于蒸汽流的运动会产生声波,在蒸汽流有干扰的情况下,蒸汽流会加速; 同时,声波也会增强。在短距离内如果蒸汽流遇到连续的干扰,会使汽流速度再次增大,使声波的能级大大加强,因此产生较大的噪声。太原第一热电厂16 号机侧弯头B 至三通C 的距离仅为1 000 mm ,主蒸汽管噪声超标的原因可以认为是弯头B 至三通C 之间的间距太小,在短距离内蒸汽流遇到连续的曲面干扰所致。 相似文献
18.
汽轮机组声特性的拓展分析与探讨 总被引:1,自引:0,他引:1
该文分析汽轮机组噪声及其频谱是如何产生的.以200MW汽轮机为例,对其噪声及频谱是如何产生的作了较详细地分析计算.笔者做了动静摩擦故障与噪声的模拟试验,并探讨利用噪声传性进行汽轮机故障诊断.图3表1参8. 相似文献
19.
20.
The current state and ways for improving the effectiveness of steam turbine units at nuclear power stations (NPS) are examined. The specifics of NPS turbines is described. The comparison of NPS steam turbine performance with the performance of steam turbines at thermal power stations (TPS) demonstrates that power units of NPSs are much poorer in effectiveness due to relatively low steam conditions at the inlet and the presence of wet steam already in the first stages of turbines. A decrease in the relative internal efficiency of NPS turbines results from the enhanced negative effect of wetness in the expansion process: in modern NPS turbines, more than two-thirds of the heat drop is spent in the two-phase region, while less than one fourth in TPS turbines. It is demonstrated that the effectiveness of NPS steam turbine units can be increased drastically in the future only through a considerable rise in the turbine inlet steam conditions. This can be achieved by using a heat carrier at supercritical conditions in the NPS reactor. The dependence of the effectiveness of NPS modern turbines on the turbine inlet steam conditions in the applicable pressure ranges of the saturated steam and vacuum in the condenser, as well as on the turbine exhaust area, is examined. For a 1000 MW turbine, increasing the inlet pressure from 6.0 to 8.0 MPa raises the turbine power and efficiency by 3.5%. At a condensing turbine outlet pressure ranging from 2.5 to 7.5 kPa and a constant velocity downstream of the last stage, the turbine power and efficiency can be increased by 7%. The importance of the exhaust area for the turbine effectiveness is revealed. Alternative designs of the flowpath in a low-pressure cylinder are analyzed. A unique configuration of a steam turbine unit with two-stage moisture separation is proposed. The comparison of high-speed turbines with low-speed ones was performed. It is demonstrated that the efficiency of the examined turbines is nearly the same within the accuracy of design calculations and the test results, and it is slightly higher for low-speed turbines due to lower losses with outlet velocity. 相似文献