集中载荷作用下的套管抗挤能力分析

根据油田套管损坏情况,建立了集中载荷作用下的套管抗挤能力计算模型,利用能量法和曲杆理论,分析研究了承受180°对称分布集中载荷、90°均匀分布集中载荷和120°均匀分布集中载荷下中厚壁套管抗挤能力,得出了理想圆管抗挤强度和套管屈曲临界挤毁压力的计算公式,通过分析比较理论解与有限元解,其最大相对误差不超过1%,得出了套管抵抗局部载荷的能力低于抵抗均布载荷的结论。     

就地补偿在动力厂水泵电机上的应用实例

本文就我公司动力厂给水车间155kW水泵电机，进行无功就地补偿的可行性分析及经济效益研究，对工厂用电如何节能降耗有一定参考价值观。     

武钢 3×10~4m~3/h 空分手动变负荷生产的探索与实践

对武钢引进的两台３×１０４ｍ３／ｈ空分设备，为改变其自动变负荷生产调节范围小、时间长的问题，采用了人工手动变负荷的操作方法。实践表明：扩大了增减产范围，缩短了调节时间，有十分明显的综合经济效益，可供大型空分变负荷生产借鉴参考。     

二滩电厂双缸液压启闭机原理及故障分析

二滩电厂表孔采用弧形门,启闭形式为双缸液压启闭机.自投入运行以来,运行状况良好.汛期启闭方式已由原来的现地手动操作过渡到远方控制自动启闭.在闸门起落的过程中,由于工况的不同,两缸会出现不同步现象,因此设计中考虑了纠偏回路.本文简单介绍了二滩电厂表孔液压启闭机的原理和故障情况.     

锚索测力计有关应用问题的探讨

通过分析锚索测力计因受力状态不同而带来的系统误差,提出了测力计实测锚固力的修正方法及部分测力计传感器失效后延续锚固力测值的计算方法.     

紧凑 Tokamak(球形环)聚变堆第一壁及中心导体柱上中子负荷及核热计算与分析

采用通用蒙特卡罗粒子输运程序ＭＣＮＰ／３８计算低环径比Ｔｏｋａｍａｋ（紧凑环或球形环）聚变堆第一壁及中心导体上的中子壁负荷分布和核热沉积分布，并与常规Ｔｏｋａｍａｋ堆第一壁上中子壁负荷分布和核热沉积分布进行比较、分析。结果表明，在中子壁负荷归一化为１ＭＷ／ｍ２时，与常规Ｔｏｋａｍａｋ相比，在低环径比Ｔｏｋａｍａｋ堆第一壁及中心柱表面上中子壁负荷分布峰值并不比常规Ｔｏｋａｍａｋ堆第一壁上的峰值高，而且低于低环径比Ｔｏｋａｍａｋ堆整个第一壁上的平均值，而中心柱上的核热沉积峰值稍高于常规Ｔｏｋａｍａｋ堆第一壁上的核热沉积峰值，但对较高中子壁负荷情况，中心导体柱上的核热沉积和辐照损伤仍可能是比较严重和值得特别研究的问题。     

小眼井最优水力学设计及分析

在充分考虑小眼井钻井特点和合理确定环空压耗的基础上，将喷射钻井理论和环空携岩理论有机结合起来，导出了在两种工作方式下优化设计小眼井钻井水力参数模型，并开发了应用软件。通过实例计算，提出了在小眼井最优水力学设计中采用最大水功率工作方式的重要性，并建议在大眼井的水力参数设计中考虑钻柱的偏心、旋转和钻杆接头对环空压耗的影响。     

Stability of large-scale coal-fired MHD channels

Stability of large-scale coal-fired MHD channels is studied by (1) linearized stability analysis, and (2) time-dependent 1-D analysis. The channel length is 15 m with 600 electrode pairs, and the output power ranges from 220.6 MW through 258.7 MW. Linearized stability analyses show that the Faraday channels operated with fixed loading resistance are stable, whereas the two waves of u and u–a (u, a: gas and sound velocity) become unstable in the Faraday channel with fixed loading factor. Two waves of u and u–a are unstable in the diagonal channel with fixed loading current and the u + a wave becomes unstable in the diagonal channel with fixed electrode current. Time-dependent one-dimensional analyses indicate that the Faraday channels with fixed load resistance are smooth without growth of fluctuation. The diagonal channels with fixed electrode current are smooth with no fluctuation, though the linear theory indicates that the u + a wave is unstable. The diagonal channel with fixed load current suffers large disturbance along the latter half of the channel, being consistent with the linearized analysis which indicates that the u - a and u waves are unstable.     

Multiobjective dynamic load-dispatching method for optimal operation of power systems

A new practical method is proposed which gives a quasi-optimal solution of the dynamic load-dispatching problem formulated by a multiconstraint multiobjective optimization problem. Here, the multiple constraints are rate reserve constraints and power flow ones, and the multiple objectives are fuel cost and CO₂ emission. The proposed method is an integration of the following three techniques: (1) “Group Dispatch Scheme,” which is developed by the authors, is used to satisfy a violated constraint easily. This scheme consists of three steps. The first step is to classify all generators into two groups. One is the group which should be more loaded to satisfy the violated constraint, and the other is the should-be less loaded group. The second step is to add some load to the former group, and to subtract the same load from the latter. The third step is to dispatch each group load to each groups generators, respectively; (2) the dynamic load-dispatching algorithm is used which provides, in practical time, quasi-optimal generation trajectories; (3) the conventional weighting parametric method is used to obtain a Pareto optimal solution of multiobjective problems. The effectiveness of the method is clarified by a computer simulation on the actual power system of Kansai Electric Power Company.     

太钢3#高炉重力除尘器大件吊装

太钢3#高炉大修改造是集团公司重点外部工程项目之一，工程量大，工期紧，施工场地狭小，而质量要求较高。如何采取科学、经济的设备吊装方案，对整个项目经济指标的实现，意义重大。文章详细介绍了太钢3#高炉重力除尘器大件整体吊装方案。通过实际采用，取得良好的经济效果。