共查询到19条相似文献,搜索用时 156 毫秒
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简要叙述了中小汽轮机的选型及通流部分的改进措施。针对国产机组的状况以及我国现有的水平,参考国际大公司采用的提高通流部分效率的方法。为老机组改造及新的中小汽轮机的设计提供一些建议。 相似文献
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介绍了山东十里泉发电厂2号汽轮机(125MW)通流部分现代化改造情况,通过采用国际先进的冲动式通流设计改造技术,使机组的安全性、经济性、可靠性得到较大的提高,对国产125MW汽轮机的改进具有参考意义。 相似文献
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主要总结和分析了600MW中间再热空冷凝汽式汽轮机通流部分的特点,重点介绍了机组通流部分设计的先进性和空冷末级叶片的气动设计特点.结果证明,机组的经济性和安全性均达到先进水平,机组推出后受到用户关注. 相似文献
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阐述了基于留格尔公式提出的特征通流面积概念的定义及计算方法,在IAPWS-IF97公式基础上,利用Vis-ual Basic 6.0平台初步开发了汽轮机组通流部分特征通流面积计算软件,并以国产600MW超临界机组为研究对象,对机组变工况下级组的特征通流面积进行了计算和分析。研究结果表明:汽轮机级组的特征通流面积在通流部分尺寸不发生变化时,其值保持不变,并且变工况下其计算精度能满足工程要求,可以作为机组通流能力及通流部分故障诊断的准则参数,为机组通流部分的状态监测与故障的精确诊断提供依据。 相似文献
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盘山电厂3号汽轮机组由哈尔滨汽轮机厂有限责任公司设计制造,受当时设计及制造工艺水平限制,存在诸多不完善之处,各项经济技术指标无法满足设计要求.通流改造从优化机组通流部分和改进汽封的结构两方面入手,提高机组经济性. 相似文献
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国产四缸四排汽300MW汽轮机设计于60年代,由于历史条件的限制,机组无论是设计水平,制造和安装质量,运行方式都存在一些缺陷,如轴承箱负荷过重,摩擦阻力大,刚性不足,机组因膨胀不畅而引起启停时间过长及振动超标等问题,各电厂虽经过多次正常大修,完善化大修和技术改造,但目前仍存在一些制约机组稳定经济运行的因素,如达不到设计出力,不能适应电网调峰的要求等。迄今为止,东汽厂已对该类型的4台机组进行了改造。作者着重从该类型机组通流部分以及静止部件,如汽缸,通流间隙,滑销系统、辅助系统等阐述了改造设计特点。 相似文献
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根据上海汽轮机厂引进型汽轮机的设计要求,开发了反动式汽轮机通流部分CAD系统。该系统采用控制模块和菜单管理方式,自动化水平高,标准化和通用性好,实现了通流部分气动热力设计、强度振动计算和动叶、隔板施工图自动绘制的三位一体化。实际应用结果表明,提高设计工效约10倍,缩短了新产品开发周期,优化设计还可提高机组通流部分效率。 相似文献
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哈汽自主开发的国产首台350 MW-60 Hz汽轮机为亚临界、双缸和双排汽机组,被安装在巴西坎迪奥塔火电厂.本文介绍了机组的设计特点,并且针对高转速的特点采用的特殊设计进行了论述.本文可供同行参考,有助于加深对该种特殊机型设计上的了解. 相似文献
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介绍了汽轮机级组特征通流面积在工程实际应用中的相关表达式,以某火电厂310MW机组为例,对汽轮机级组特征通流面积进行分析。通过计算级组特征通流面积的偏差率和级组的相对内效率,判断汽轮机通流部分的运行状况,得出汽轮机第Ⅰ级组通流面积减小、其它级组工作正常、第7段和第8段抽汽压力测量值不准确、以及第5段和第6段抽汽口可能有热蒸汽漏入的结论,并提出在机组大修中对重点部位进行检查和处理建议。实践证明,利用级组特征通流面积进行理论分析的结果与实际相吻合。 相似文献
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New high profitable wind turbines 总被引:1,自引:0,他引:1
To generate more quantities of electric energy from wind it is necessary to use a new type of wind turbine built in the regulable mantle's nozzle. This wind turbine type replaces the free air stream from wind by a programmed, i.e. regulated, and partially concentrated stream of air. The nozzle shell is designed as an aerodynamically shaped ring with wings with its lower pressure side pointed towards the centre so that the lift force on each part of the wing is directed radially towards the centre. This induces centrifugal reaction force in the airflow that causes the stream field to expand strongly downstream of the rotor and includes a greater number of streamlines in the active stream in front of the rotor (upstream). Thus the nozzle forces a higher mass flow rate of air through the turbine. The higher mass flow and higher velocity reduction behind the rotor result in a higher energy output from the wind turbine in the nozzle. In this way the wind turbine efficiency is multiplied. New turbines induce more power from weaker and medium winds and their lasting time, because of the relation P=f(v3) (i.e. the power corresponds to wind velocity raised to third power). Wind turbine nozzle produces three times more energy than conventional wind turbine. Short economic analysis for conditions of the island of Lastovo indicates that profit gained by new turbines is up to five times higher than by conventional turbines. The new wind turbine nozzle should generate interest and demand on an international market, even for regions with weaker winds. 相似文献
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The principle of optimally tuning the air flow rate and subsequent distribution of pressure drops is applied to optimize the performance of a thermodynamic model for an open regenerative cycle of an externally fired micro gas turbine power plant with pressure drop irreversibilities by using finite-time thermodynamics and considering the size constraints of the real plant. There are eight flow resistances encountered by the working fluid stream for the cycle model. Two of these, the friction through the blades and vanes of the compressor and the turbine, are related to the isentropic efficiencies. The remaining flow resistances are always present because of the changes in flow cross-section at the compressor inlet and outlet, the turbine inlet and outlet and the regenerator hot/cold-side inlet and outlet. These resistances associated with the flow through various cross-sectional areas are derived as functions of the compressor inlet relative pressure drop, and control the air flow rate and the net power output and thermal efficiency. The analytical formulae for the power output, efficiency and other coefficients are derived, which indicate that the thermodynamic performance for an open regenerative cycle of an externally fired micro gas turbine power plant can be optimized by adjusting the mass flow rate (or the distribution of pressure losses along the flow path). It is shown that there are optimal air mass flow rates (or the distribution of pressure losses along the flow path) which maximize the net power output. 相似文献
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AP1000作为未来国内发展的主力核电堆型,比现有二代半堆型功率更大、寿命更长,且有内陆应用要求等新特点,其发展对汽轮机设计开发提出了新的要求。介绍了上海电气电站设备有限公司上海汽轮机厂(以下简称STP)在AP1000核电汽轮机设计中的创新设计特点,通过对核电汽轮机关键部件60年寿命设计、核电汽轮机及基础整体抗震性能评估、核电汽轮机低压焊接转子设计、核电汽轮机长叶片系列化设计等方面的介绍,旨在探讨如何提高汽轮机的运行寿命、安全性和经济性。这些创新设计基于大量的试验计算研究,其研究结果将对我国AP1000核电汽轮机的自主化设计及未来核电产品的出口起到积极的推动作用。 相似文献
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300MW中间再热直接空冷凝汽式汽轮机主要技术特点 总被引:1,自引:1,他引:0
介绍了上海汽轮机有限公司空冷300MW汽轮机的主要技术特点,通过对结构、通流、轴系和差胀进行优化设计,确保机组运行的安全性及其性能的先进性。目前该机组在市场上取得了良好的经济效益和社会效益。 相似文献