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金沙江下游梯级电站中长期调度精细化出力计算方法 总被引:1,自引:0,他引:1
为满足金沙江下游梯级电站中长期精细化调度对水能计算的高精度要求,从基于最优流量分配的全站经济运行总表入手,分析了最优流量分配表在中长期水能计算中的适用性,推求了考虑电站日运行方式的中长期最优流量分配表,并在分析其特性的基础上提出了基于“最小点-调峰上临界点-调峰下临界点-最大点”的中长期精细化出力计算方法。该计算方法不仅实现了金沙江下游梯级电站中长期调度精细化水能计算,也为其他装机容量大、可运行水头范围广的大型电站中长期精细化出力计算提供了参考。 相似文献
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梯级水电站工作深度优选的模糊非线性规划模型 总被引:2,自引:0,他引:2
本文提出确定梯级水电站最优工作深度(死水位)的模糊非线性规划模型。这是水资源系统最优化问题研究中的一个新课题,它能使水能规划工作带来显著的经济效益,得到更优的梯级电站总保证出力。 相似文献
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本文提出了一个研究电力系统水电站最优建设顺序的模型,实质上也就是一个电力系统电源规划模型。该模型是按年分阶段、以电站建设可能的组合作状态的动态规划模型。模型既可以研究电力系统水火电站的最优建设顺序,也可以同时研究系统中某些电站的最优装机容量。文章分析和阐述了模型,并给出了应用此模型研究华南电力系统水火电站建设的结论。 相似文献
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长江是中国最大的水能资源,也是世界上最大的水能资源之一.长江的开发计划中有100座装机容量在25万千瓦以上的大坝,总装机达15000万千瓦.开发长江水能资源同时可以获得防洪、灌溉、供水和航运等效益。本文通过对100座坝址的地理位置、地形、水文、地质、综合效益、水库淹没和对外交通等条件的分析,认为三峡工程的地理位置和综合效益是最优的.同时提出在软弱基岩上或在岩溶地区建坝、地下建筑、高当地材料坝和拱坝以及抗震问题. 相似文献
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为充分利用水能资源,结合石头河水库管理局东干渠第三断面扩建后的过水能力,经过现场勘察及水能计算,为电站增容和工程的可行性提供依据。经过技术经济分析,认为电站增容切实可行。 相似文献
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通过对焦化厂所用水水质和不同用水系统工艺特点的分析,制订焦化厂梯级用水制度,降低水耗30%;对水处理设备进行改进,稳定水处理药剂浓度;根据阻垢及缓蚀实验结果,确定适用于高氯离子浓度循环水系统的阻垢缓蚀剂。 相似文献
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The methanol barrier layer adopted for high-concentration direct methanol fuel cells (HC-DMFCs) increases water transport resistance, and makes water management in HC-DMFCs more challenging and critical than that in the conventional direct methanol fuel cell (DMFC) without a methanol barrier layer. In the semi-passive HC-DMFC used in this work, oxygen was actively supplied to the cathode side while various concentrated methanol solutions, 4 M, 8 M, 16 M, and neat methanol, were passively supplied from the anode fuel reservoir. The effects of the cathode relative humidity, cathode pressure, and oxygen flow rate on the water crossover coefficient, fuel efficiency, and overall performance of the fuel cell were studied. Results showed that electrolyte membrane resistance, which was determined by its water content, was the predominant factor that determined the performance of a HC-DMFC, especially at a high current density. A negative water crossover coefficient, which indicated that water flowed back from the cathode through the electrolyte membrane to the anode, was measured when the methanol concentration was 8 M or higher. The back flow of water from the cathode is a very important water supply source to hydrate the electrolyte membrane. The water crossover coefficient was decreased by increasing the cathode relative humidity and back pressure. Water flooding at the cathode was not severe in the HC-DMFC, and a low oxygen flow rate was preferred to decrease water loss and yield a better performance. The peak power density generated from the HC-DMFC fed with 16 M methanol solution was 75.9 mW cm−2 at 70 °C. 相似文献
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Integrated collector/storage solar water heaters, due to their simple compact structure and inherent freeze protection, offer a promising approach for solar water heating in colder climates. Such a system, designed specifically for application at a Northern latitude, has been developed incorporating a heat retaining storage vessel mounted within a concentrating cusp reflector supported by a novel exo-skeleton framework. The performance was determined experimentally under real operational conditions in the Northern Irish climate. A detailed cost analysis is presented and payback periods, substituting different local fuel/power sources, determined. 相似文献
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针对目前再生水评估模型不全面、易丢失原始信息等情况,选取典型评价指标建立了一套多级再生水综合评价指标体系,采用层次分析法结合熵权法创建的组合赋权法确定各指标权重,针对多评价指标选择改进的多级优度评价法,建立起基于物元分析与关联函数的再生水综合评估模型,以关联度判别各指标的优劣,用多级优度计算结果判定再生水综合发展能力,最大程度地利用所有原始数据。云南省三市再生水综合发展能力评估应用表明,评估结果与实际情况相符,进而验证了多级优度评价法用于再生水综合评估工作的可行性与合理性。 相似文献
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本文以某冷轧循环水处理站设计为例,介绍了冷轧厂循环水水质要求、处理工艺流程,确定了循环水系统的水量平衡和相关设备参数,阐述了该水系统稳定水质的相关措施. 相似文献
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以合肥市为例,选取人均水资源量、年产水模数、人均供水量、植被覆盖率、日生活用水量、万元GDP用水量、万元工业增加值需水量、人口密度、城市化率、农田灌溉定额、水资源开发利用率、人均GDP、污水排放达标率、水功能区达标率、生态用水率15个指标,在建立合肥市水资源承载力评价指标体系及等级标准体系的基础上,构建模糊分析模型并借助Matlab工具计算隶属度、确定指标权重,进而计算2013~2017年水资源承载等级,获得了合肥市水资源承载力情况,计算结果对合肥市水资源开发利用具有一定的参考意义。 相似文献
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《International Journal of Hydrogen Energy》2022,47(95):40445-40461
One of the promising options in the pursuit of clean and sustainable energy is fuel cell technology. PEM fuel cell stands out among fuel cell technologies due to its high efficiency, compactness, and ability to be used in portable applications. SPEEK (with different sulfonation degrees) and PVA blend membranes, which are thought to create a good synergy for PEM fuel cell, were prepared by using the solution casting method. As a result of the weight loss experiments, it was understood that the membranes dissolve in water regardless of the degree of sulfonation. Thermal crosslinking was carried out to prevent the membrane dissolution in water, which is in continuous contact with water in the fuel cell. Dissolution was mostly prevented by means of the thermal crosslinking process. Changes in the physical, chemical, and mechanical structure of the membrane after thermal crosslinking were comparatively determined by fourier transform infrared (FTIR), thermogravimetric analysis – differential thermal analysis (TGA-DTA), differential scanning calorimetry (DSC), water uptake capacity, swelling property, ion exchange capacity (IEC), dynamic mechanical analysis (DMA), electrochemical impedance analysis and oxidative stability. In addition, single-cell performance tests were performed with the membrane that gave the best results in the characterization analyses. Analysis results showed that thermal crosslinking prevented the dissolution of membranes in water ingreat extent. In addition, it was determined that the thermally crosslinked membranes had a more stable structure. 相似文献