富春江水电站220kV开关站混凝土构架的检测及修补技术

富春江水电站运行40多年,电站开关站混凝土构架出现混凝土剥蚀和裂缝。针对实际情况,对混凝土构架进行无损检测,检测内容包括凝土裂缝深度、混凝土强度、混凝土碳化深度、构架内部钢筋保护层厚度和构架内部钢筋锈蚀检测等,并根据检测的情况提出了补强加固方案。该技术对于水电站混凝土构架的检测和加固具有一定指导意义。     

电厂入炉煤水分软测量分析及软件实现

煤的水分是煤在开采、运输、储存、洗选和使用过程中最容易改变的参数,也是对锅炉燃烧的安全和经济性影响最大的因素之一。对于大多数火力发电厂而言,锅炉入炉煤煤质分析一般都滞后于锅炉运行,对入炉煤水分的实时监测是长期以来锅炉设计、制造特别是运行人员所期盼的。以磨煤机热平衡机理为依据,对入炉煤的水分的软测量方法加以分析和讨论,借助软件工具实现了这一计算方法并在多家发电厂进行了现场检验。     

浅谈预应力钢筋混凝土输水管外压校核

预应力钢筋混凝土输水管外压校核是确定管子级别中非常重要的问题 ,论述了外压校核基本方法 ,为实际工程中选取合适管子级别提供了重要依据。     

Exergetic utilization of solar energy for feed water preheating in a conventional thermal power plant

This communication is based on exergy concept for the utilization of solar thermal energy in a Rankine cycle‐based fuel‐fired thermal power plant (FFTPP). It has been shown that solar thermal energy as an aided source for feed water preheating helps to reduce the exergy loss in feed water heater (FWH) of Rankine cycle and develops more work than that could have been produced in a solar thermal power plant (STPP). It has been found that this enhancement in work increases for low‐pressure FWHs. For further illustration, a case study has been carried out of a typical 50 kW STPP and a 220 MW FFTPP. The effect of utilizing the same input solar thermal energy of typical STPP, if used as an aided source in a 220 MW FFTPP for feed water preheating is investigated. The work output of STPP is 59.312 kW, while the extra work output of FFTPP by using solar thermal energy of STPP is 90.27 kW. It has been found that the efficiency of work conversion of aided solar thermal energy in FFTPP is higher than the efficiency of work conversion in STPP. Copyright © 2009 John Wiley & Sons, Ltd.     

天生桥一级水电站混凝土面板堆石坝的施工实践与体会

对天生桥一级水电站工程的拦河大坝——混凝土面板堆石坝的主要施工方法进行了介绍,同时对施工中遇到的一些实际问题进行探讨,阐述了我们的实际作法,并结合施工实际提出了建议。     

Optimization of the working cycle for a hydrogen production and power generation plant based on aluminum combustion with water

The working cycle of a novel hydrogen and power generation system based on aluminum combustion with water is analyzed in order to evaluate the best performance in terms of energy conversion efficiency. The system exploits the exothermic reaction between aluminum and steam and produces thermal power for a super-heated steam cycle and hydrogen as a by-product of the reaction.     

Facile construction of well-defined hierarchical NiFe2O4/NiFe layered double hydroxides with a built-in electric field for accelerating water splitting at the high current density

Interfacial charge redistribution induced by a strong built-in electric field can expertly optimize the adsorption energy of hydrogen and hydroxide for improving the catalytic activity. Herein, we develop a well-defined hierarchical NiFe₂O₄/NiFe layered double hydroxides (NFO/NiFe LDH) catalysts, exhibiting superior performance due to the strong interfacial electric field interaction between NiFe₂O₄ nanoparticle layers and NiFe LDH nanosheets. In 1 M KOH, NFO/NiFe LDH needs 251 mV and 130 to drive 50 and 10 mA cm^?2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Moreover, only 1.517 V cell voltage is needed to reach 10 mA cm^?2 towards overall water splitting. Notably, under simulated industrial electrolysis conditions, NFO/NiFe LDH only needs 289 mV to drive 1000 mA cm^?2. This work puts a deep insight into the role of the built-in electric field in transition metal-based catalysts for accelerating water splitting and scalable industrial electrolysis applications.