铸锭铣床的技术改造

分析了影响铸锭铣床生产的设计和制造缺陷等因素，提出改进措施，取得了良好效果。     

浮式钻井平台升沉补偿系统主动力研究

为了提高浮式钻井平台升沉补偿系统的补偿效率,在被动补偿的基础上增设主动补偿系统。主动式补偿系统中主动力是关键参数之一,对系统的综合性能有重要影响。建立了天车补偿系统数学模型,基于Simulink软件系统,对主动力的影响因素开展研究。分析了补偿缸支撑载荷和储能器工作容积对主动力的影响规律,为补偿系统的开发提供设计依据和技术支撑。     

基于AMESim的液压混合动力系统节能特性

介绍了液压混合动力车辆制动能量回收、释放的原理,对其制动过程进行了分析,根据车辆动力学模型,建立了液压混合动力车辆AMESim模型,结合实际情况对车辆和相关液压参数进行设置,对制动能量回收、释放过程进行仿真,并在实验台上进行了相应的典型工况试验。仿真结果表明,车辆克服滚动摩擦和机械摩擦及蓄能器充放热能损耗后,能量回收率为38.7%,能量释放率达到85.1%。通过试验验证了仿真曲线的正确性,说明此模型能够比较直观地分析液压混合动力车辆的动力性能及制动效果,可以为以后液压混合动力车辆的研发与优化提供参考。     

Design and fabrication of a MEMS-based metal hydride/air accumulator for energy harvesting

Microaccumulators are one of the key components that will decide on the success of energy harvesting based autonomous micro-electro-mechanical systems (MEMS). Little efforts however were made to integrate high-capacity accumulators on chip level. Since the film thickness and therefore the achievable capacity per unit area of integrated Li accumulators is rather low, we propose a new integrated planar metal hydride/air microaccumulator of very high capacity, suitable for autonomous microsystem applications. The alkaline microaccumulator consists of a microstructured thin film air-breathing cathode and a high-capacity low-pressure type metal hydride anode. Both electrodes are separated by an anionic conducting polymer electrolyte membrane. A MEMS-based process was developed to fabricate the prototype microaccumulators. The preliminary testing results showed that the microaccumulator is able to deliver an open circuit voltage of 0.88 V and a maximum power density of 0.559 mW/cm². This result shows that the accumulator is competitive or even superior to today's thin film Li accumulators. The air-breathing electrode however was identified to mainly limit the cell performance and its fabrication process is therefore still under optimization for further improvement.     

地铁盾构施工蓄电池矿用机车选型与车辆编组

介绍了蓄电池矿用机车的结构及机车主要参数,进行了盾构施工水平运输车辆编组分析及机车选型,指出在盾构施工电瓶车选型时可根据线路条件、掘进参数,在提高掘进和运输效率的前提下,选择合理的机车型号和编组。     

时序能耗液压系统节能设计新方法

本文介绍一种以液压时序能耗平均值为设计依据,筛选出适合节能液压系统的2～4个特征压力源,以超级蓄能器、液压功率转换器和双压力驱动回路为技术手段,构建出一种多压力源、梯级负载蓄能站并实行主、辅工作泵制度的节能液压系统模型,应用该模型可以使现有液压系统节能率整体达到60％以上.     

基于AMESim捣固装置节能液压系统仿真

针对捣固车捣固作业过程中阀控节流系统在频繁周期动作时产生大量能量损失的问题,提出了一种节能液压系统方案.对捣固车捣固装置升降油缸高频往复运动工况进行分析,研究了其能量回收潜力;运用AMEsim软件建立原系统和节能液压系统仿真模型;比较了两种方案下的油缸位移和流量.研究结果表明:在此节能液压系统中,蓄能器的容积对系统节能...     

1MW塔式太阳能电站蓄热系统模拟分析

以1MW塔式太阳能电站蓄热系统为研究对象,通过理论分析,建立了管壳式换热器、热罐、冷罐以及蒸汽蓄热器的动态数学模型,经验证模型具有合理性.在此基础上对蓄热系统的充、放热过程进行了模拟计算,分析研究了换热器A和C的动态特性、冷热罐内油温的动态变化以及蒸汽蓄热器的充、放热特性.模拟结果为双级蓄热系统的过程控制提供了理论依据.     

A theoretical study of molten carbonate fuel cell combined with a solar power plant and Cu–Cl thermochemical cycle based on techno-economic analysis

A novel power and hydrogen coproduction system is designed and analyzed from energetic and economic point of view. Power is simultaneously produced from parabolic trough collector power plant and molten carbonate fuel cell whereas hydrogen is generated in a three-steps Cu–Cl thermochemical cycle. The key component of the system is the molten carbonate fuel cell that provides heat to others (Cu–Cl thermochemical cycle and steam accumulator). A mathematic model is developed for energetic and economic analyses. A parametric study is performed to assess the impact of some parameters on the system performance. From calculations, it is deduced that electric energy from fuel cell, solar plant and output hydrogen mass are respectively 578 GWh, 25 GWh and 306 tons. The overall energy efficiency of the proposed plants is 46.80 % and its LCOE is 7.64 c€/kWh. The use of MCFC waste heat allows increasing the solar power plant efficiency by 2.15 % and reducing the annual hydrogen consumption by 3 %. Parametric analysis shows that the amount of heat recovery impacts the energy efficiency of fuel cell and Cu–Cl cycle. Also, current density is a key parameter that influences the system efficiency.     

一种测试蓄热型波纹板流动传热特性的实验方法

通过实验方法准确而全面的测试得到蓄热型波纹板流动和传热性能,对于开发和设计紧凑换热器具有重要意义。瞬态实验方法可以求得蓄热型波纹板时间和空间上的平均传热系数,也即当量传热系数。单吹技术是一种应用单一流体的相对简单的瞬态实验方法,考虑蓄热型波纹板通道内波形板和定位板与空气层传热接触面积不同,拓展了单吹技术数学模型,并建立了相应的计算程序。将现有单吹实验装置中冷、热风进口分离开来,避免冷风流经加热装置,有效提高现有单吹实验装置的综合效率。测得DU-K(double corrugated-kaier,DU-K)波纹板的流动传热特性与Re拟合曲线,与文献中DU(double corrugated,DU)波纹板进行比较,在Re为1 000~11 000时,其传热特性平均比DU波纹板低17.41%,流动阻力平均比DU波纹板要低55.96%.针对DU-K与DU波纹板几何结构的不同,分析了DU-K综合特性较DU得以改善的原因。