湮灭辐射法煤炭灰分旁路测量的实现

本文所述湮灭辐射法煤炭灰分旁路测量装置采用７．４ＧＢｑ６０Ｃｏγ射线反散射方案，通过６０Ｃｏγ射线照射煤样，测出电子对引起的正电子湮灭辐射峰和康普顿反散射峰的强度来确定灰分。这种方法测量精度高（绝对不确定度小于２％），时间短（小于５ｍｉｎ一组数据），可用于国内煤种复杂煤质以次充好的入口检测，也可用于火力电厂煤种类繁多，煤灰分成分变化较大的上炉监测，以便调整进煤量，节约能源，减少污染。

全钒液流电池的旁路电流测量与仿真

全钒液流电池的旁路电流引起电荷损失、降低电池效率,升高电堆两端的单电池电压,导致副反应发生和减少电池寿命。目前,关于旁路电流的理论研究较多,但是测量数据较少。首先,为了测量旁路电流,采用双极板中嵌入电流表的方法监测流过双极板的电流,该电流与外部电流之差即为旁路电流,因此,能够排除电解液交叉污染引起的电荷损失干扰。其次,建立了全钒液流电池系统的改进模型,将旁路电流的仿真结果和实测数据进行比较,验证了改进模型的合理性,并对各单电池的电压、电流时间变化及电堆内电压分布进行仿真。同时,对总管电阻、支路电阻、电池内阻对电池的电流效率、电压效率、电池效率的影响进行了分析,得出为了提高电池的效率,有必要增加总管电阻,降低电池内阻的结论。该模型和实验可用于液流电池设计,为高性能液流电池技术发展提供理论依据。

脱硝烟气排放连续监测系统氨浓度的测量

针对脱硝烟气排放连续监测系统氨浓度测量存在的技术难题进行了技术改造,提出抽取式旁路测量装置的整体优化设计创新设计方案,工程试验结果表明,能够实现对氨浓度的稳定测量。

The Influence of Modulated Slotted Synthetic Jet on the Bypass of Hump

This paper deals with the influence of phase modulated synthetic jet on the aerodynamics of the hump in a closed test section Of the Eiffel-type wind tunnel. Three experimental methods of measurement techniques of this phenomenon were used： the pressure profile using the Kiel total pressure probe, the velocity profile using the CTA （constant temperature anemometry） probe and the visualization of the flow field using the hot film and the thermo camera, The experimental results with and without the influence of the synthetic jet were compared, as well the impact of the phase shift of the neighbouring synthetic jets. As a reference case, the flow around the hump without the influence of the synthetic jet was selected. The results of the measurement are presented in figures and compared.

Evaluation of Heat and Current Characteristics of Bypass Diodes for Fault Detection in Photovoltaic Module

In recent years, PV （photovoltaic） systems have been installed rapidly around the world. However, there is often a delay in the practical application of fault detection in PV systems. In this study, the temperature of BD （bypass diodes） mounted on PV modules was measured for simple and practical fault detection. The temperature of the BD of Module 31 was higher than other modules and a large current passed through one of the BDs. Measuring BD temperatures is easier than other conventional methods of fault detection. From the results of the rise in BD temperature under dark conditions, the increase in temperature increased linearly with increasing current flow. There is a proportional relationship between heat generated and the increasing temperature of the terminal box. The experimental results about surface temperature of the junction box in actual system operation suggested that the electric current through a BD in a terminal box can be known by measuring the surface temperature of the terminal box for PV module fault detection without a system shutdown. Moreover, we tried to evaluate temperature distribution of a terminal box using heat conduction equations. The evaluated results agreed well with the measured results.