共查询到19条相似文献,搜索用时 125 毫秒
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超超临界锅炉的刚性梁为栅格式刚性梁系统。刚性梁主要由水平刚性梁、垂直刚性梁和桁架式刚性梁及各种刚性梁附件组成。本文主要介绍超超临界锅炉刚性梁的结构、原理及安装过程中的注意事项和相关处理的方法。 相似文献
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针对某电站锅炉首次试运行期间发生的水平烟道局部振动案例进行了分析,并认为水平烟道垂直、水平刚性梁的结构设计、安装等因素是局部振动的主要原因,着重对刚性梁的结构进行了讨论,提出了具体的改进方案和措施,取得了良好的效果。为同类型锅炉的设计安装注意事项提供了可借鉴的方案。 相似文献
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针对水冷壁爆漏,冷灰斗四角开裂导致漏热等问题,从刚性梁系统安装,运行方面加以分析探讨,制定制性梁系统的改造措施,以减少和防止水冷壁管爆漏、提高电厂运行安全等。 相似文献
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超临界锅炉的刚性梁导向装置,采用空间斜拉杆结构。导向装置一端与水平刚性梁相连,跟随水平刚性梁一起膨胀,另一端与钢结构相连,两端连接节点都采用铰接结构。导向装置主要承受地震荷载、风荷载、锅炉膨胀荷载。 相似文献
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通过求解椭圆方程技术来调整网格正交性和边界附近网格距离来生成非周期C型网格。周期国界采用物理参数双线性插值,结合矢通量分裂隐式差分格式对RD叶栅跨音流场进行了无粘数值模拟,结果表明非周期C型网格比周期H型网格可以更细致地模拟叶型头部区域流场,而且可以更准确地捕获激波。该网格系统有效地改善了网格正交性,加密比较自由,对透平叶栅数值模拟具有很好的发展前途。 相似文献
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系统地介绍了天中直流工程的基本情况,以及投产后对西北电网物理结构、调管关系、运作模式的综合影响,探索建立基于网-省两级横向考核及国-网-省三级纵向协调的西北电网运行控制模式,提出“天中直流外控制区”、“新疆电网内控制区”、“西北主网控制区”三大控制区划分思路,结合西北电网调度现状剖析各自的边界条件和判据关系,对比了2种基本控制协调模式的优劣,得出融合2种模式优点的最佳方案。 相似文献
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电力系统的新计算模式--网格计算 总被引:7,自引:1,他引:7
介绍了网格计算这种新的计算模式,它可以大幅度提高计算性能而且不需要增加任何额外硬件成本。分析了网格计算的特点,指出应用网格计算的关键在于将电力系统固有特点与网格计算特点相结合,并提出电力系统应用网格的体系结构,最后分析了应用网格计算所涉及的关键问题及技术。 相似文献
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西北750kV电网发展规划若干问题探讨 总被引:3,自引:1,他引:2
介绍了“十一五”前后至2015年西北750kV电网发展的主要目标:建设覆盖五省(区)的750kV主干网架、实现新疆与陕甘青宁750kV同步联网、实现西北电网与西藏联网、不断推进西北外送电通道建设并扩大外送电规模,以及750kV电网“十二五”规划最新进展。探讨了西北电力外送、西北与新疆联网、风电大规模送出、甘肃至宁夏和甘肃至青海第二回输电通道规划、电磁环网解环以及规划与运行校核标准不统一等当前西北电网发展规划中的重点、难点问题,并提出了相关建议。 相似文献
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This paper is aimed at presenting the changes experienced by a convective flow in a closed square enclosure when surface radiation is taken into account. The flow is driven by a centrally placed discrete heater in an air filled two dimensional square enclosure. Symmetrically cooled isothermal vertical walls and insulated horizontal walls are considered. The governing coupled partial differential equations were solved using a finite volume method on a uniformly staggered grid system. The resulting augmentation of fluid velocities and the factors causing them are discussed. 相似文献
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In the current context of a decarbonizing electricity system, grid innovation is needed to deal with the main challenges of integrating distributed generation, demand and storage, and large-scale renewable energy sources. Grid companies however have disincentives to innovate under the conventional regulatory framework, and if they do innovate, they are confronted with grid users that have disincentives to participate in the innovation. This paper analyzes three empirical cases where state of the art regulatory frameworks have been successful at stimulating grid innovation. The main lesson learned from the cases is that there is experience with addressing the disincentive of grid companies to innovate, but the participation of grid users in the innovation is much more an open issue. 相似文献
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Bassam A. Jubran Hilal A. Al-Hinai Yousef H. Zurigat Sami Al-Salti 《Renewable Energy》2003,28(10):1545-1553
This paper reports on the feasibility of using various Photovoltaic (PV) systems namely; Grid PV (GPV), Stand-Alone PV (SAPV), Grid PV Wind (GPVW) and PV Wind (PVW) for supplying the power requirements of a window-type air-conditioning system or other small loads. It was found that the GPVW system is the best system to meet the load requirement of a window-type air-conditioning system under the climatic conditions of Oman with values ranging from $39,500 to $56,500 for the capital cost and $9,000 to $33,000 for the total net capital cost depending on the wind speed. These values are attractive for remote off grid applications. 相似文献