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基于模糊综合评判的凝汽器运行状态评价 总被引:5,自引:0,他引:5
针对凝汽器运行性能的影响因素多、运行状态难以用单一的评价指标加以评价的特点,采用多指标来评价凝汽器的实际运行状态。利用模糊数学理论,建立了凝汽器运行状态评价指标的模糊隶属函数,同时利用模糊综合评判方法建立了凝汽器运行状态的综合评价模型。该模型易于编程实现,对机组运行人员及管理人员具有一定的指导意义。 相似文献
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指出了现有的大多采用以磨制每吨煤所消耗的电量为基准来评判制粉系统耗电率的不足之处,提出了一种较为客观全面的评价方法-模糊综合评判法,并给出了模糊综合评判模型。不仅考虑到制粉系统的耗电量,还要考虑到磨制出的煤粉的“优劣”情况,如影响着火燃尽行性及不完全燃烧热损失的煤粉细度R90,反映干燥出力的磨出口煤粉温度、原煤的种类和性质,以及制粉系统的金属耗用量,材料耗用量和其它各种费用。新的评价方法使得制粉系统效率能够进行统一评判。 相似文献
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针对水轮发电机在线监测参数多、参数间关联不确定和模糊、难以评价设备整体健康状态的问题,提出基于模糊综合评判的水轮发电机组健康状态在线评价方法,通过合理选择状态监测信息,分部件建立水轮发电机健康状态评价层次指标体系,统一确定各个指标评价状态的隶属函数,按照模糊综合评判方法对各层指标进行评价及逐层融合,得出水轮发电机的综合运行健康状态。实例应用结果表明,该方法合理、可行,其评价结果与实际情况相符。 相似文献
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本文是以专家评分法列出汽轮机评价的因素和相应的权重分配,对机组的优劣程度直接评分,再按模糊综合评价法对专家评分的结果进行排序和选择,最后以上海汽轮机厂的优化型30万千瓦汽轮机和另一台外国同类机组为实例,得到定量的评价结果。 相似文献
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输电线路状态评估工作可为输电线路的检修和维护提供参考依据。基于模糊综合评判法提出了输电线路状态评估模型,建立了包含8个一级指标和31个二级指标的多层次输电线路状态评估指标体系,通过3标度层次分析法分析各指标的权重,采用模糊合成得出输电线路的状态评估结果,制定5级输电线路状态评语集。算例结果表明,基于模糊综合评判法的输电线路状态评估方法是合理和有效的。 相似文献
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针对水电监理队伍管理的实际和存在的问题,将模糊数学中的模糊综合评判原理应用于监理单位的监理水平评估和监理工程师的评优工作,并提出了详细的应用步骤和方法。应用实例表明,这种方法更为科学、公平和合理。 相似文献
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针对流量测量精度要求相对较低,且因工程改造中资金困难情况,或者管道设施无法满足流量仪器的基本要求情况下,提出了流量巡测法与有功功率换算法(Q-N法),实践与理论分析表明它们是有效可行的。 相似文献
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梯级泵站变速节能的优化计算 总被引:2,自引:0,他引:2
梯级泵站采用变速调节可以很好地满足各级站之间的水位、流量约束,故运行时的动态配合过程简单,其运行优化问题可以简化为整个提水系统的静态扬程分配问题。本文以整个梯级提水系统的总能耗最小为准则,通过求解动态规划模型来确定各级站的最优扬程和相应的开机方案及各机组的最优转速。 相似文献
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目前城市给水系统中大多数水泵的实际运行流量小于水泵的设计流量,导致了水泵运行效率降低。结合宜昌市某水厂送水泵房经济给水改造工程,提出了水泵选择应根据平均时用水量来计算扬程,水泵台数不宜太少,且应不同型号的水泵相互搭配,并采用3台泵组合完成该项改造工程,取得了较好的经济效益,降低了水厂运行成本。 相似文献
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This paper presents the experimental performance test evaluation of a commercial wind-driven positive displacement pump type JOBER of 3 in diameter. Results of the behaviour of pump lift rod peak force, in relation with the lift rod elasticity and the piston valve closure delay are presented. The pump performance is analysed in terms of its volumetric and overall efficiencies. Evidence about a possible effect of the piston valve closure delay over the pump overall efficiency is also discussed. 相似文献
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《International Journal of Hydrogen Energy》2022,47(6):3980-3993
Battery electric vehicles (BEVs) and hydrogen fuel cell vehicles (HFCVs) will predominate in near future, and the new energy vehicle (NEV) charging station which provides charging services for aforementioned NEVs could grow rapidly. The reliability of the NEV charging station would be the primary concern for early construction and NEV users. This study investigates the reliability evaluation of NEV charging station considering the impact of charging experience and analyzes the influence of various factors by comparing the evaluation results. The explicit modelling of the station considering power generation system, coupling devices and hydrogen storage is presented and an optimal revenue model is established to coordinate the operation of the station. A reliability index system is established to evaluate the charging reliability of the NEV charging station and reflect the charging experience. In addition, an amount model estimating the number of vehicles accessed in the coming days is proposed to address the impact of driver charging experience on the reliability evaluation. The results show that it is necessary to consider the charging experience in reliability evaluation. The comparison and analysis of reliability evaluation results reveal that the charging reliability and profit of the charging station are influenced by the initial hydrogen in tank, the price of hydrogen/electricity and the sizes of electrolyzer, hydrogen tank and fuel cell. The reliability evaluation provides guidance for determining the parameters of these factors. 相似文献
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An attempt to develop a simple framework for financial evaluation of renewable energy technologies (RETs) such as photovoltaic (PV) pump, windmill pump, biogas and producer gas-driven dual fuel engine pumps for irrigation water pumping has been made. The unit cost of water and unit cost of useful energy delivered by the RETs have been estimated. The monetary benefits that accrued to the end-user have been quantified in terms of the amount of diesel or electricity saved. Financial figures of merit for the investments made in the RETs have been estimated. The effect of fuel price escalation on these measures of financial performance has also been evaluated along with the estimation of the break-even prices of fuels likely to be substituted by RETs. Results of some exemplifying calculations are presented and briefly discussed. 相似文献
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《全球能源互联网(英文)》2020,3(6):521-531
Congo River has abundant hydropower resources, and large-scale cascade power stations, such as the Grand Inga, can be constructed in downstream locations. However, the fragile economic foundations of the Democratic Republic of the Congo and neighboring Central African countries, and the small-scale regional power consumption market prohibit the implementation of large-scale hydropower projects. As the high-voltage, long-distance power transmission technology matures, hydropower from the Grand Inga can be delivered to load centers in other regions of Africa. This study establishes a 6 dimensional comprehensive assessment model using the best–worst method to evaluate large-scale, long-distance, cross-border power interconnection projects.The model is applied to evaluate all the candidate inter-regional power delivery schemes of the Inga III hydropower station, and the evaluation results can effectively help investment institutions and policy makers in policy making and potential market targeting. 相似文献
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叙述了煤矿机电设备的运行现状,分析了设备的常见故障以及管理失位,提出了机电设备维护管理的相关措施,并展望了矿井机电设备维护的发展前景。 相似文献