LKJ2000型机车监控装置柴油机转速记录抖动故障的分析

对LKJ2 0 0 0型机车监控装置在运用中出现的柴油机转速记录抖动现象 ,进行了深入的调查分析并制定解决措施 ,经实施 ,收到了较好的效果。     

LKJ2000型监控记录装置软、硬件存在的问题及解决措施

对LKJ2 0 0 0型监控装置软、硬件在我段使用过程中存在的几个主要问题进行了探讨 ,并提出了有效的解决方法。     

LKJ-93A列车运行监控记录装置系统故障分析

根据多年来LKJ 93A监控装置的运用和检修经验,探讨LKJ 93A列车运行监控记录装置发生系统故障的主要原因,并提出一些切实有效的解决方法。     

LKJ2000型监控装置显示器"黑屏"故障的解决

针对LKJ2000型监控装置在实际运用过程中出现的屏幕显示器“黑屏”故障,进行了全面、深入的调查分析,并制定攻关解决措施,取得了明显效果。     

监控记录装置故障原因分析及解决措施

对LKJ—93A型列车监控记录装置产生影响列车运行安全的故障进行了分析,并提出了相应的解决措施。     

南疆线DF8B型机车的设计改进

简要介绍了南疆线线路的特点及DF8B型机车运用情况;详细阐述了针对线路特点及运用中暴露的主要问题进行的设计改进;并简要探讨了南疆线DF8B型机车的牵引模式及进一步进行设计改进的设想。     

列车运行监控记录装置数据复核诊断系统的研究与应用

介绍了铁路列车监控记录装置数据复核系统的基本结构、组成和主要功能,阐述了系统硬件实现原理和软件模块.应用该系统可实现对LKJ2000型监控装置的测试、地面数据的比对复核、地面数据的曲线显示,监控模式的自动复核,运行达示控制自动验证,监控装置运行记录文件的自动回放等功能.很好地解决了监控模式复核、达示验证及地面数据开发中的繁琐、易错等问题,极大地减轻了现场工程技术工作人员的工作量,同时为准确地进行安全分析提供了良好的平台.     

关于内燃机车行车安全设备的两项改进

1问题的提出莱芜钢铁集团有限公司运输部现有内燃机车25台,自2005年开始到2006年底,在所有机车上都安装了行车安全设备。该设备由LKJ．93A型列车运行监控记录装置、Js型数字化通用式机车信号系统、机车速度系统和机车制动系统组成。     

LKJ2000型监控装置控制项目测试

LKJ2000型监控装置程序使用前,要对其进行评估,文章针对现有程序,给出一套完整控制项目测试内容,使软件管理人员能够迅速、可靠地完成评估。     

刘家峡2~#发电机定子线棒采用313°不完全换位

刘家峡2~# 发电机系1969年产品,定子线棒采用 0°/360°/0°换位方式,主绝缘为环氧粉云母带B级绝缘.这种换位方式使定子线棒的股线、电流及温度分布很不均匀,导致线棒的平均温度升高,局部温度更高,严重影响线棒运行的可靠性和使用寿命.为解决此问题,并结合发电机改造增容(由225MW增至250MW),决定线棒采用新的换位方式.     

Heat and Mass Transfer in Multicomponent Condensation and Boiling

This paper reviews the state of the art in design methods for multicomponent condensation and boiling. In multicomponent condensation, a range of methods of varying complexity are available to calculate the local heat and mass transfer rates; the complexity depends on the detail with which the mass transfer resistances are calculated. These methods are briefly reviewed and their interrelationships along with those of their expertmental validation are discussed. Mixture boiling research has thus far followed different lines and very little effort has gone into understanding the liquid multicomponent diffusion process in boiling. Research work has been mainly concentrated on understanding the dynamics of bubble growth; heat transfer calculations are done using empirical corrections to coefficients calculated for pure fluids. The extensive research in these areas is reviewed and also the few previous studies on convective two-phase heat transfer to mixtures are described. In conclusion, possible design recommendations are offered. It is suggested that, although condensation and boiling heat transfer in mixtures have hitherto been studied separately, a combined research approach may produce further advances.     

Morphological and statistical features of reaction zones in MILD and premixed combustion

Direct numerical simulation (DNS) results of turbulent MILD premixed and conventional (undiluted) premixed combustion have been investigated to shed light on the physical aspects of reaction zones and their morphology in MILD combustion. Results of a premixed case are used for comparative analyses. The analyses show that the regions with strong chemical activity in MILD combustion are distributed over a substantial portion of the computational domain unlike in the premixed case where these regions are confined to a small portion of the domain. Also, interactions of reaction zones are observed in MILD combustion with their spatial extent increasing with dilution level. These interactions give an appearance of distributed combustion for MILD conditions. The morphology of these reaction zones is investigated using the Minkowski functionals and shapefinders commonly employed in cosmology. Predominant sheet-like structures are observed for the premixed combustion case whereas a pancake-like structure is observed as the most probable shape for the MILD cases. Spatial and statistical analyses of various fluxes involved in a progress variable transport equation are conducted to study autoignitive or propagative characteristics of MILD reaction zones. The results suggest that there are local regions with autoignition, propagating-flames, and their coexistence for the conditions considered in this study. Typically, reaction dominated or ignition front and propagating-flame dominated regions are entangled for high dilution cases. Scalar gradient plays a strong role on whether reaction or propagating-flame dominated activities are favoured locally.     

南苑220 kV变电站高压线倒路设计

对南苑220kV变电站改造中各路高压线路的进出线倒路设计进行了介绍,阐述了倒路设计原则及过渡设计方案,解决了旧站增容改造工程中在完全不影响现有变电站正常运行的前提下,完成现有变电站所有出线线路改造及节省工程投资、合理控制工程造价。提高工程建设效率等一系列难题。     

Helium conservation and supply and demand projections in the USA

Simulataneous equation models are constructed to explain the interdependent relationships among the supply and demand as well as the stock of helium storage under the conservation programme and the natural gas reserve policies. Two-stage least squares techniques are employed for coefficient and elasticity estimation from data collected between 1955 and 1977. Long-run projections for helium supply and demand are presented. Policy issues on helium conservation and intergeneration welfare analysis are also discussed and suggestions on future helium utilization made. Since gas price deregulation will be up for review again in the USA, this paper may have some important implications for natural gas pricing policy in dealing with multiple products.     

The roles of science and technology in energy and environment research and development

Countries are becoming increasingly aware of the importance of science and technology in relation to national development and the necessity of formulating a concise science and technology policy. The need to strengthen and orient the scientific and technological infrastructure in line with national development goals, through more effective use of an available qualified work force and the higher education system, is becoming widely recognized. Consequently, appropriate methods of assessing the impact of science and technology on national development are needed so that efforts are concentrated on areas potentially having substantial impacts. Numerous planning studies have been undertaken to this end, particularly by international organizations such as UNESCO, UNIDO, OECD and IEA. This study examines the inter‐relationships of the disciplines of science and technology with energy and environment research and development (R&D) activities, particularly for developing countries. The connections between these topics are discussed along with some basic methods that can be used to exploit the relations. Some illustrative examples are presented. It is anticipated that the present study will serve as a preliminary step for more comprehensive work by providing an example of the utilization of formal methods in formulating science and technology policy for energy and environment R&D. Copyright © 2001 John Wiley & Sons, Ltd.     

Physiochemical and leaching characteristics of fly and bottom ash

Bottom ash and fly ash are the by-products of coal in thermal power plants. They are the combustion wastes and contain many elements that may harmful to the environment. The present study investigates the physiochemical, mineral, and leaching characteristics of an Indian coal ash (bottom ash and fly ash). From the characterization of bottom ash and fly ash, it is found that the ash samples are enriched predominantly in silica, alumina, and iron oxides. A series of leaching experiments have been performed to analyze the tracing elements of metal at the different liquid to solid ratio (L/S). The L/S varies from 20:1 to 80:1. From the leaching results of the fly ash and bottom ash data, it is observed that the tracing elements of Mn, Mg, Cr, Zn, Ni, Pb, Fe, and Cu are the most abundant elements, while Hg, Mo, and Co are the least abundant elements.     

汽化炉同轴度和垂直度测量和调整的探究

汽化炉同轴度和垂直度的测量与调整是目前国内比较难以解决的问题。随着我公司汽化炉等石化产品产量增加,测量精度要求提高,以前的测量方法已经无法满足检测需要。为此,我们借鉴了国内外同行业先进的检测技术,用测微准直望远镜等光学仪器进行测量,提高了测量精度。     

Status and prospects of local solar heating and cooling systems

In this paper, a state-of-the-art of solar heating and cooling systems is presented. Solar air heaters and different types of solar water collectors are discussed in detail. Storage systems including water, rocks, and heat-of-fusion salts are described as are space heating systems employing solar air heaters, in conjunction with rock or heat-of-fusion salt storage, and the use of water collectors plus hot water storage for space heating and domestic hot water. An indication of the commercialization of various space-heating systems and broad economic projections are presented. The three major solar cooling methods—absorption cooling, solar mechanical systems, and those involving humidification-dehumidification cycles—are also discussed in detail. Finally, an overview of solar heating and cooling activities in Kuwait is also given.     

能源与环境的新形势和新任务

2003年，将是我国国民经济持续高速发展的一年。也是国家重点强调能源和环境保护的一年。文章根据国家有关部门领导的报告，综合了我国能源和环境现状，介绍国家的计划安排和相应政策，侧重于燃煤烟气脱硫方面的政策措施，使能源和环境科技工作者明确在新的一年中我们肩负的重任。     

卧式内燃燃油和燃气锅炉的结构和设计

讨论了卧式内燃燃油和燃气锅炉的总体结构和设计。提出燃油和燃气锅炉炉膛、尾部受热面和燃烧器设计的要求。