Diversity of Biogas Plant Realizations

A techno‐economic analysis for four different types of biogas plant realizations was performed, including one biogas biorefinery concept. For each concept detail, a process flow diagram was created. Mass and energy balances were estimated. The net present value and payback were calculated for each concept for a better feasibility understanding. The results showed that with the used expensive substrate, namely, wheat straw, the obtained paybacks appeared to be more than 100 years. Sensitivity analysis was done for the price range of a substrate. Critical factors were defined to improve feasibility.     

玻璃气浮桌的压力计算

通过使用流体力学理论对玻璃生产线气浮桌进行分析,给出气浮桌设计的理论依据。     

联合机组试车方案研究

分析了联合机组的特点,针对性提出了该机组试车方案,保证了联合机组的试车成功。     

回转窑托轮瓦研磨角度及研磨方法的改进

回转窑托轮轴轴承设计与刮研非常重要。介绍了JCJ03-1990轴瓦与轴颈装配要求,并根据实践经验提出了轴瓦与轴颈的接触角为30°,接触面内进行研磨和接触面内不进行研磨两种研磨方法。此类方法特点是轴瓦与轴颈的接触角小,从瓦口开始刮研油囊,油囊弧顶处一直延伸到接触带位置;能有效避免翻瓦和轴拉丝的重大事故。     

化工原理教学方法探讨

化工原理是一门重要的技术基础课程。文章从建立工程概念,突出重点,学生参与等几个方面入手,就如何促进课堂教学,达到学生轻松掌握理论知识,灵活应用知识的目的做了些探讨。     

Comparison of multi-inlet and serpentine channel design on water production of PEMFCs

Two flow field designs, a new multi-inlet design and a conventional serpentine design, for a PEMFC together with relative humidity (RH) and porosity of the gas diffusion layer (GDL) are studied in relation to net water production using a 3-dimensional computational fluid dynamics simulation. The results show that (1) with increasing GDL porosity, discharged water in the serpentine design slightly increases, because accumulated water decreases, whereas discharged water in the multi-inlet design decreases due to a reduction of generated water; (2) although fuel cell power performance improves as RH increases, net water production decreases in both designs, because more water is accumulated; and (3) comparatively higher power and net water production are observed with the multi-inlet design, owing to uniform distributions of reactant gas and water. It is determined that, for net water production without compromising power production, input water should be decreased and, for higher cell performance, flow field design like multi-inlet design should be developed.     

雷达装备保障能力评估研究

结合雷达兵部队装备保障的现实情况,从评估指标体系的建立原则、内容等方面着手,构建了完整的雷达装备保障能力评估指标体系,给出了综合评估的具体步骤,并通过实例进行了分析.     

一种光伏发电组合式升压DC-DC变换电路研究

针对传统光伏发电BOOST电路升压效果不理想,输入电压变化时电压增益不稳定,输出电能质量不高等缺点,提出一种光伏发电组合式升压DC-DC变换电路,详细分析了该电路的升压原理及互补控制的算法。该电路具有以下特点:电路的升压效果较好,电压增益约为4.5;输入电压变化时,电压增益稳定;输出电能质量较高,电压波动百分数1.5%;电路控制简单。     

250m甲板驳船带缆桩及其支撑结构强度分析

带缆桩作为典型的系泊设备,在其系泊作业时会受到巨大的集中力载荷的作用。根据中国船级社发布的MSC/Circ.1175通函要求,系泊设备的支撑构件的强度必须要进行有限元分析。运用有限元软件MSC/Patran及MD/Nastran,对船长250m的甲板货驳船,选取27号肋位处的带缆桩及其支撑结构强度进行了有限元校核,结果满足结构的强度要求,为带缆桩处结构的优化设计起到指导作用。