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 Simulation of Boiler Proper System of 200MW Fossil-fired Generating Unit 200MW火电机组锅炉本体系统的仿真 短句来源 Based on characteristic parameters of the hot water two-section type lithium bromide absorbing refrigeration machine and the parameters of the central heating system in Taiyuan City proper, the thermal economic behavior of adopting cool-electricity cogeneration to 300 MW extraction condensing unit has been calculated and analysed. 根据热水二段型溴化锂吸收式制冷机的性能参数和太原市城区集中供热系统的参数,计算分析了300MW抽汽-凝汽式机组采用冷电联产的热经济性。 短句来源 It’s mainly designed with the adoption of the MCU AT89S51 together with special formaldehyde sensor. It can detect the HCHO concentration by designing the proper acquisition circuit and display the HCHO concentration in LabVIEW control panel through RS 232 serial port. 该系统以AT89S51单片机为核心,选用专用的甲醛传感器并设计了采集通道,通讯方式采用RS232串口,控制面板用LabVIEW开发,最后在控制面板上显示甲醛气体浓度曲线。 短句来源 We draw the conclusion that the proper TCO thickness is about 100 nm and n-μc-Si is more suitable for matching. 通过实验和理论计算,得到最合适的膜厚100nm左右。 与n-a-Si相比,n-μ-c-Si与TCO匹配更好。 It is found that the proper conditions ares the concentration of Li-ion 0. 8 mol/L, the concentration of PVP 0. 3 mol/L and the spin-speed of 2 000 r/min. The thickness of the film is about 0. 6 μm. 当转速为2 000 r/min,锂离子浓度为0.8 mol/L,聚乙烯吡咯烷酮浓度为0.3 mol/L时,可制得表观形貌较好的LiMn2O4 薄膜,薄膜厚度在0.6μm左右。 更多

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 proper
 LetRo andR1 be two Kempf-Ness sets arising from moment maps induced by strictly plurisubharmonic,K-invariant, proper functions. It is shown here that there are proper subsets of ${\cal M}$ that also form a complete set of translation invariants, and these subsets are characterized. The existence and uniqueness of optional and predictable projections of setvalued measurable processes are proved under proper circumstances. Benson proper efficiency in the nearly cone-subconvexlike vector optimization with set-valued functions Under the assumption of nearly cone-subconvexlikeness, a Lagrangian multiplier theorem on Benson proper efficiency is presented. 更多
 One of the ways to raise the efficiency and diminish local overheating is by the using of shields to decrease the stray losses produced in the stator core end-plates or rotor surface of an electrical machine due to the rotating magnetic fields. However, as has been indicated in the papers by several writers, positive effects of shielding are not always realized; that is to say, the stray losses may even increase if the material or thickness of the shield is not properly chosen. In this paper, theoretical analysis... One of the ways to raise the efficiency and diminish local overheating is by the using of shields to decrease the stray losses produced in the stator core end-plates or rotor surface of an electrical machine due to the rotating magnetic fields. However, as has been indicated in the papers by several writers, positive effects of shielding are not always realized; that is to say, the stray losses may even increase if the material or thickness of the shield is not properly chosen. In this paper, theoretical analysis of the losses in multilayer media in the rotating fields is made, a formula for the calculation of the stray losses in machines with shields is derived from this theoretical analysis based on the Maxwell's equations and curves are drawn. Finally a primary field coefficient Kp, so named by the authors, is given so as to facilitate the proper designing of the shields.. Experiments on a model have been carried out and the results obtained agreed with the analytical study. 利用屏幕以减少电机定子端部压板损耗或转子表面损耗是提高电机效率及减轻局部过热现象的措施之一。但在屏幕层的材料及厚度选用得不合适时，也有可能增加损耗。本文进行了旋转磁场中多层媒介质的损耗的理论分析，从马克士威方程推导出有屏幕时的损耗计算公式，文章最后提出了“原磁场系数”Κρ作为对选择适当的屏幕材料及厚度以减少某次谐波的损耗的判据。 计算公式的结果与从模型实验上所得的结果是相符的。 This paper presents a method of determining the actual average temperature rise of the stator winding of a high-voltage a.c. machine, by measurig-the resistance of that winding under load by means of Kelvin bridge. The method discussed herein has the following special features:1) The installation for measurement is at zero potential, so that safety is assured in operation,2) By taking appropriate measures, disturbance of the a.c. components is Kept away from the bridge circuit, so that the installation of a... This paper presents a method of determining the actual average temperature rise of the stator winding of a high-voltage a.c. machine, by measurig-the resistance of that winding under load by means of Kelvin bridge. The method discussed herein has the following special features:1) The installation for measurement is at zero potential, so that safety is assured in operation,2) By taking appropriate measures, disturbance of the a.c. components is Kept away from the bridge circuit, so that the installation of a complicated filter in the galvanometer circuit can he omitted. While the galvanometer still operates steadily.3) A unified method for choosing measuring elements can he applied to various ratings of machines.4) High accuracy of measurement is assured. The maximum error of resistance measurement is within 0.3%, if proper measuring elements were chosen.In the paper the result of measurement and its error are analyzed. 在本文中讨论了一种用双臂电桥测量高压交流电机在运行时的定子绕组电阻,从而得到定子绕组实际平均温升的方法。这种方法的特点是: 1.测量装置处于零电位,保证了操作的安全。 2.采取了适当的措施,将交流干扰消除在电桥线路之外。这样就避免了在检流计回路中采用复杂的滤波装置,而检流计仍能稳定工作。 3.对各种不同的电机可用统一的测量元件选择方法。 4.这种方法保证了较高的测量准确度。当合理选用测量元件时,电阻测量的最大误差可在0.3％以下。 文中分析了电阻测量结果及其误差,还列举了一些试验结果。 This paper gives certain preliminary opinions concerning the measures of insulation coordination to be adopted in EHV networks in China.The authors recommend that the actual network configurations should be considered while determining the basic insulation levels, that the use of shunt reactors and a. definite switching sequence are the principal means for limiting service frequency overvoltages, that the application of proper circuit breakers are effective and economical means to limit switching surges,... This paper gives certain preliminary opinions concerning the measures of insulation coordination to be adopted in EHV networks in China.The authors recommend that the actual network configurations should be considered while determining the basic insulation levels, that the use of shunt reactors and a. definite switching sequence are the principal means for limiting service frequency overvoltages, that the application of proper circuit breakers are effective and economical means to limit switching surges, and that the equipment and apparatus insulation levels are finally determined in accordance with the protecting levels provided by lightning arresters. It is emphasized that the effective limitation of overvoltages should be achieved by a proper combination of various means, which supplement one another.With reference to the present insulator design and operating experiences in China, the authors remind that the insulation level determination, the controlling effect of the specific creepage distance and the external insulation of the station equipment should fulfill the same requirement.In this paper, testing voltages for station equipment, air gaps, line and substation insulators in 330 KV networks are recommended. Finally, the various problems concerning EHV network insulation coordination are pointed out, which need a further investigation. 本文对我国超高压电力网的绝缘配合提出了初步意见。 文章认为:在选定绝缘水平时,必须考虑具体电网结构的特点;限制工频过电压的主要措施是并联电抗器和规定操作顺序;断路器作为限制操作过电压的首要措施是经济合理的;电气设备的绝缘水平,应最后按避雷器的保护水平来确定。文章强调,限制过电压的各种措施互相配合,互相补充,构成一个有效的限制过电压的整体;因此,必须依靠这些措施的综合作用。 文章根据我国的运行经验指出,采用现行结构的绝缘子时,绝缘水平的确定,洩漏比距所起的控制作用以及变电所的外绝缘,也应当满足同样要求。文中对330千伏电网中线路和变电所的绝缘子、空气间隙和电气设备的试验电压作了推荐。 文章最后提出了超高压电网绝缘配合方面应进一步探讨的若干问题。 << 更多相关文摘
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