Two-stage numerical simulation for temperature profile in furnace of tangentially fired pulverized coal boiler

Considering the fact that the temperature distribution in furnace of a tangential fired pulverized coal boiler is difficult to be measured and monitored, two-stage numerical simulation method was put forward. First, multifield coupling simulation in typical work conditions was carried out off-line with the software CFX-4.3, and then the expression of temperature profile varying with operating parameter was obtained. According to real-time operating parameters, the temperature at arbitrary point of the furnace can be calculated by using this expression. Thus the temperature profile can be shown on-line and monitoring for combustion state in the furnace is realized. The simulation model was checked by the parameters measured in an operating boiler, DO130-9. 8/540. The maximum of relative error is less than 12% and the absolute error is less than 120℃, which shows that the proposed two-stage simulation method is reliable and able to satisfy the requirement of industrial application.     

浅析光纤数字通信系统的维护

光纤通信发展迅猛，在电力系统通信中得到广泛应用。维护人员在掌握光纤数字通信系统原理的基础上，应重点掌握以下几方面。     

Effect of electromagnetic force on turbulent flow of molten metal in aluminum electrolysis cells

The standard κ-ε model was adopted to simulate the flow field of molten metal in three aluminum electrolysis cells with different anode risers. The Hartman number, Reynolds number and the turbulent Reynolds number of molten metal were calculated quantitatively. The turbulent Reynolds number is in the order of 10^3 , and Reynolds number is in the order of 104 if taking the depth of molten metal as the characteristic length. The results show that the molten metal flow is the turbulence of high Reynolds number, the turbulent Reynolds number is more appropriate than Reynolds number to be used to describe the turbulent characteristic of molten metal, and Hartman number displays very well that electromagnetic force inhibits turbulent motion of molten metal.     

《电路与电子技术》课程教学方法的改革

电路与电子技术基础是计算机类专业一门重要课程,课程内容涉及面广且较复杂,包含了电路和电子技术的知识。通过对该课程在教学方法、辅导方式、实践技能培养和考核方式的改革,利用有限的学时完成该课程的教学任务,不但了提高课程教学质量,而且提高了学生的综合思维和分析问题、解决问题的能力。     

定型工艺废气“超低排放”技术开发及研究

定型工艺是纺织物后整理的重要工序,定型机废气温度高、成分复杂、透明度差,需要对其进行有效处理。开发JRY定型废气处理工艺,通过试点项目投运,经检测达到"超低排放"标准要求。     

新型去毛刺机与辊道互锁设计及应用

为了获得良好的连铸坯火切毛刺去除效果,避免轧制钢板因板坯毛刺形成麻点等表面缺陷以及对设备造成损伤,新钢在连铸工序新增两套锯齿型去毛刺机,为此在原有的控制系统和新增去毛刺机控制系统之间建立通讯接口以及联锁关系,设计了相应的通讯程序以及联锁程序。系统投用后提高了板坯毛刺去除效率,保证了去毛刺机设备稳定顺行。     

易变形的汽车连接器模具设计创新

为了解决连接器的变形问题,模具设计进行了创新,结合MoldFlow对变形量的分析,对变形部分增加了补偿,有效的解决了变形问题。     

TiO2纳米棒光阳极的制备及性能改进

首先采用水热法制备 TiO2纳米棒光阳极,并引入 Au@SiO2纳米颗粒对其性能进行改善。结果表明,Au@SiO2纳米颗粒的引入虽然增强了光吸收,但同时减少了染料在 TiO2纳米棒上的吸附量,反而导致了电池器件性能的下降。因此,在 TiO2纳米棒/Au@SiO2纳米颗粒结构上进一步生长一层 TiO2钝化层：一方面可增加染料吸附量;另一方面有利于减少电荷复合。基于这种光阳极组装的染料敏化太阳能电池获得了 2.34%的光电转换效率,较单一 TiO2纳米棒光阳极组装的电池效率提高了 60%。     

分布式能源天然气冷热电三联供系统10万m~2办公建筑模拟分析

以供能面积为10万m2的办公建筑为例,建立了分布式能源天然气冷热电三联供系统的供能方案,并制定了运行策略。在此基础上,对供能方案的能源利用率、环境效益和经济性进行了分析。通过与常规供能方式(分别用市电、电制冷、燃气锅炉供电/冷/热的方式)的对比,总结了采用分布式能源天然气冷热电三联供供能的特点与优势。