环境大气压力条件对TRT发电量的影响

为了解决A、B钢厂的同型号TRT发电量差异较大的问题,通过理论计算的方法,结合TRT的工作特性,对影响两家钢厂TRT发电量的因素进行了分析。结果表明:大气条件的不同是造成两家钢厂同型号TRT发电量较大差异的原因。由于所处的大气条件不同,造成了TRT膨胀比和折合流量的不同,从而导致发电量的较大差异,并且导致B钢厂的TRT不能通过高炉的最大流量。钢厂在进行TRT选型时,不仅要考虑高炉总体运行参数,还要将大气条件计算在内,结合不同的大气条件进行理论估算,保证主要运行工况处于TRT的高效率区。     

低排放燃烧室燃料空气预混均匀性研究

为了解决燃料与空气均匀预混的问题,以气态燃料-低排放塔式同轴分级燃烧室为研究对象,采用数值模拟与实验设计数理统计方法相结合,研究了主燃级叶片角、叶片数、燃料速度和单面孔数对燃料和空气预混特性的影响,筛选出对燃料空气预混均匀性影响的显著项,并拟合得出均匀性的预测公式。结果表明：单面孔数及其平方项对预混均匀性影响最大;燃料速度与叶片角、燃料速度与单面孔数的交互效应其次;叶片数、叶片角、燃料速度及其平方项和交互项对均匀性的影响最小。     

A new ship energy management algorithm to the smart electricity grid system

In this paper, a new energy management algorithm has been suggested for the ships connected with alternative energies considering the smart electricity grid features. The algorithm focuses on the use of optimum energy source on the shipboard based on the priorities of authorities such as the most economic, environmental, or both criteria at the ports. The algorithm is performed in MATLAB, and several case studies are simulated to validate the results. The 5 maritime nations, which are at different regions: United States, Belgium, Turkey, China, and Australia, are taken into account in the case studies. The actual data of a bulk carrier ship have been used to achieve tangible results in the simulations. The results of the case studies are compared to determine the changes of energy cost and released emission to meet demand of electricity on the ships. Capital cost of the proposed concept is also given to make an economic evaluation. The results show that the ship energy management algorithm provides the significant economic and environmental advantages. This paper aims to contribute to the importance of the ships in the smart electricity grid concept for the maritime and electricity sector representatives.     

Analysis of the convective heat transfer and flow behavior around two counter‐rotating side‐by‐side cylinders

This study presents details of the heat and fluid flow around two counter‐rotating cylinders. For this goal, three different nondimensional gap spaces such as G/D = 1.5, 2.0, and 3.0 are examined in the constant Reynolds number of 200 and Prandtl number of 7.0. In addition, computations are carried out at various nondimensional rotating speeds (R.S) in the range from 0 to 4. The obtained results are validated against the available data in the open literature for stationary cases. The results showed that the flow structure, vortex shedding process, and exerted forces on the cylinders strongly depended on the R.S and G/D. Reductions of the drag coefficients are observed for both cylinders with increasing the R.S due to suppression of the wake downstream of the cylinders at low R.S and eliminating the vortex shedding process at high R.S. Finally, it is demonstrated that, regardless of the G/D value, increasing the R.S diminishes dramatically the convective heat exchange rate between the cylinders and fluid flow.     

平庄西露天煤矿西北帮滑坡分析

通过对平庄西露天煤矿西北帮滑坡的野外调查与观测，分析西北帮滑坡的边界条件及滑坡位移特征，确定了滑坡模式，论述了滑坡的诱发因素和边坡整治工程的理想部位。     

锅炉侧面来风对空冷机组换热效率的影响

环境风特别是横向环境风会引起热风回流,造成空气凝汽器换热恶化,影响直接空冷机组的安全、经济性运行。以国内某电厂300MW直接空冷系统为例,利用Fluent软件,针对锅炉侧面风给直接空冷机组带来的不利影响,对空冷岛外部流场进行了数值模拟研究。主要分析了锅炉侧面来风的不同风速下空冷平台流场情况,研究了锅炉侧面风在对空冷风机冷空气吸入量和空冷凝汽器换热性能的影响。     

基于改进灰色关联度分析的风机故障诊断系统

在分析原有高炉送风系统故障诊断方法所存在缺陷的基础上,提出了一种改进的灰色关联度计算方法,并成功地应用于系统的故障模式识别。该方法先以空间向量夹角的余弦来衡量比较序列之间的局部相似性,然后以局部相似性的平均值衡量比较序列之间的整体相似性,从而克服了原有灰色关联度计算过程中所存在的固有缺点。实践证明,该方法计算简单、计算量小、诊断结果更符合实际。     

Applications of state estimation in multi-sensor information fusion for the monitoring of open pit mine slope deformation

The traditional open pit mine slope deformation monitoring system can not use the monitoring information coming from many monitoring points at the same time, can only using the monitoring data coming from a key monitoring point, and that is to say it can only handle one-dimensional time series. Given this shortage in the monitoring, the multi-sensor information fusion in the state estimation techniques would be introduced to the slope deformation monitoring system, and by the dynamic characteristics of deformation slope, the open pit slope would be regarded as a dynamic goal, the condition monitoring of which would be regarded as a dynamic target tracking. Distributed Information fusion technology with feedback was used to process the monitoring data and on this basis Klman filtering algorithms was introduced, and the simulation examples was used to prove its effectivenes. Supported by Liaoning Province Technology Key Project(2007231003, 2006220019); Liaoning Province Talent Fund Projects(2005219005, 2007R24); Liaoning Province Innovative Team Projects(2007T071, 2006T076)     

爆破载荷作用下高陡节理岩质边坡动态响应的3DEC模拟

运用三维离散元程序3DEC, 对某露天矿高陡节理岩质边坡在自然状态下的静态响应和爆破载荷作用下的动态响应进行了模拟, 分析了爆破载荷作用下边坡质点的振动速度以及位移和应力特征, 并将计算结果与现场监测结果进行了比较。结果表明, 两者吻合较好, 用3DEC模拟爆破载荷作用下节理岩体边坡的动态响应是适合的。     

提高复测支导线定位精度的新方法

为了提高导线测量定位精度,在充分考虑传统导线计算特点的基础上,提出了用端点截取法来确定导线相对最弱边的方法,同时改进了复测支导线计算公式,用以确定该边的精度。实测数据验证表明,采用端点截取法确定的导线最弱边即为工程测量实际的最弱边。改进的计算方法简便有效,在缩短计算时间的同时确保了工程生产的精度要求,大大提高了特殊施工条件特别是井下导线测量的工作效率。