基于大数据的继电保护装置健康状况评估与预测研究

分析了传统电厂继电保护装置健康检测的问题和瓶颈,介绍了基于大数据的继电保护装置健康评估与预测的程序及优势,探讨了大数据技术在电厂继电保护中的应用路径以及未来发展的应用趋势。     

多场景与分时段计量下的穿越电量研究

随着新能源快速发展,新能源电厂与火电厂上网出线进行新建、变更或删除,使得电厂上网路径呈现多种形式。在不同接线方式下,电厂下网有可能出现部分电量通过其他出线上网,从而引起潮流闭环运行状态,产生穿越电量问题。通过分析不同电厂一次主接线图以及关口计量表位置,甄别功率穿越的不同路径,提出多场景分析法并建立模型分析;同时根据下网时段引起穿越电量这一现象,提出一种分时段分析法解决穿越电量问题。从而为决策者提供更多的选择,结果证明这两种方法求解决电厂穿越电量问题的实用性和可行性。     

“花园式”城市型燃机电厂生态化设计研究

  目的  随着清洁电力工业的发展，燃机电厂建设成为城市区域规划的重要内容。作为一个庞大的工业建筑群体，如何塑造其形象，使其作为一个大型景观群体出现，以生态、和谐、自然、环保的积极作用为周围环境增彩成为现今燃机电厂设计的新方向和必然趋势。  方法  在燃机电厂设计之初确定全厂建筑、环境进行景观化和生态化设计的目标，对各建筑进行整体性的景观化设计，并融入生态化设计理念。  结果  以华能东莞燃机电厂为依托工程，对全厂布局优化考虑、景观化优化设计理念进行分析，打造出一个建筑新颖、景色美观、环境清新、生态良好的现代化“花园式”电厂。  结论  所提实施路径可供后续同类电厂设计参考。     

燃煤电厂全过程低碳节能技术路径探讨

  目的  燃煤电厂的低碳节能路径是缓解我国能源危机与环境污染的重要策略。  方法  文章评述了当前燃煤电厂在燃料供应设计阶段和节能运行维护阶段的低碳节能技术以及低碳技术潜在的发展方向。  结果  对于电厂燃料供应设计阶段的低碳技术应优化生物质/氨与煤的掺烧比例,良好的掺烧比例有利于炉内充分燃烧,降低碳排;电厂节能运行维护阶段吸收技术、吸附技术和气体分离技术是碳颗粒捕集的常用手段,同时储能技术、深度调峰技术、柔性直流供电技术对于CO₂减排具有重要作用。  结论  对电厂低碳技术发展进行展望,认为采用综合互补低碳协同方式,并结合电厂运行过程中的监管反馈调控措施,将是促进电厂可持续能源发展的重要发展方向。     

西门子高度灵活的燃气轮机联合循环电厂

介绍了为满足电网对机组灵活性及降低全寿命运行成本的要求，西门子所提出的“灵活燃气轮机联合循环电厂(FlexPlant)”(下简称灵活电厂)设计理念，即一种具有频繁快速启动和调峰能力，总体运行效率更高。更灵活的联合循环电厂；并详细列举了“灵活电厂”设计中所采取的先进技术．以及在缩短启停时间，提高低负荷效率以及减少电厂的排放水平所取得的成果。“灵活电厂”具有的巨大经济效益和市场竞争力将明显超过现有的燃气轮机联合循环电厂。     

区域秸秆资源最优化收集路径与运输成本分析

从GIS技术在秸秆收集运输过程中的应用出发,研究了基于Arcgis模型手段与Python脚本功能的两点间最优路径的批量分析方法.并以即墨市20 MW秸秆电厂原料的收集运输过程为例,完成了最短路径的分析、最优收集点的选择及其最小运输成本的估算,以期为全国秸秆资源合理收集与运输提供基于空间分析技术的科学解决途径.     

电厂粉煤灰物理化学特性研究及综合利用方案优化

本文对哈三电厂的粉煤灰进行了物理化学性能研究分析，在此基础上，对哈三电厂的粉煤灰进行了品质评定；同时进行了粉煤灰综合利用方案的优化分析，得到哈三电厂粉煤灰的应用应以分选灰为主，同时配以粉煤灰的制品生产。     

DG400—140型给水泵增容节能改造

锅炉给水泵是火力发电厂最重要的辅机设备，它的安全经济运行在电厂中起了至关重要的作用，水泵效率的高低直接影响电厂的节能降耗的工作。几年来各电厂结合了辅机效率测试的普查工作，积极开展节能降耗工作。自９３年起，永安电厂积极做好节能工作，进行水泵增容改造、提高效率等一系列工作。本篇文章对永安电厂＃７、＃８、＃９三台ＤＧ４００－１４０给水泵进行节能改造进行总结，效益分析。     

采用燃气蒸汽联合循环改造老电厂的途径

根据我国目前电厂状况及国家燃料政策的现状，论述了不同类型老电厂的改造方式和条件，合理的电厂改造容量，阐明了采用燃气蒸汽联合装置是改造老电厂的有效途径，并对改造方案进行了分析。     

樟洋燃机电厂电气主接线选择的考虑

结合燃机电厂的特点，介绍了樟洋燃机电厂电气主接线，说明了燃机电厂电气主接线选择时的原则，并根据该电厂的实例，阐述了是否装设发电机出口断路器等主接线选择时考虑到的一些问题。     

浅析磨合期汽车的使用

如何合理使用磨合期的汽车，使其摩擦机件的磨损量能够平稳、均匀地磨合而不至于过度磨损，对汽车实际使用寿命有着重要的意义。从机器磨合期的特点和磨损机理出发，对汽车磨合期如何正确使用进行了有实际意义的探讨。     

高压变频器在炼铁厂节能改造中的应用

叙述了高压变频器系统的功能与节能效益,指出高压变频器应用于除尘系统的技术改造可提高设备的自动控制水平,还能达到节能降耗的目的。     

10月份煤炭市场供需形势综述

通过对我国10月份煤炭产量的分析,表明我国煤炭市场需求增势强劲,价格呈现了持续攀升的良好势头,同时指出受市场供需及其他因素的影响,近期煤炭价格还会上涨,煤炭供应和销售问题仍应引起有关方面重视。     

Utilization of straw in biomass energy in China

China is a big agricultural country and one of the most abundant straw resources in the world, producing more than 620 million tons of straw in 2002, and representing about 33–45% of energy consumption for livelihood in rural areas. Utilization of straw as energy with high efficiency and rationality not only meets the demands for energy as the economy grows, but also provide a basis for environmental protection and sustainable development of society in China. This paper reviews the present utilized technologies of straw in biomass energy, including improved stove, biogas, straw gasification and straw briquette, which are already commercialized and popularized in China. Other technologies, such as liquefaction, straw carbonization and bio-coal, are also presented. Based on the technology status and potential, the future research and development of straw in the biomass energy portfolio in China are proposed.     

Energy economics of cooking in households in Nepal

This paper focuses on the economic analysis of energy consumed for cooking in urban households in Nepal. In this paper, annual energy requirements, energy efficiency, various combinations of fuels, stoves and utensils used for cooking and their corresponding costs have been examined through lab experiments and surveys. The estimate of system efficiencies for household cooking is one of the major contributions of this paper. The paper also discusses costs of energy use and compares various energy alternatives for cooking. It is believed that the analysis presented here will be helpful to the policy planners to devise better energy options for households.     

Condensation of vapor in the presence of non-condensable gas in condensers

This paper presents a set of differential and algebraic equations that model heat and mass transfer in condensers in which a mixture of water vapor and non-condensable gas is cooled. The model has been used to predict the condensation rate, the bulk temperatures of the coolant and the gas–vapor mixture, and the surface temperatures of the condenser wall. The predicted results for counter flow tube condensers are compared with three sets of published experimental data for system in which air is the non-condensable gas. It is found that the predicted condensation rates and coolant bulk temperatures agree very well with all the three sets of experimental data, the predicted wall temperatures agree reasonably well with the experimental results, and the agreement between the predictions and the experimental results on the bulk temperature of the air–vapor mixture is excellent for one set of the experimental data, reasonable for the second set of experimental data, but poor for the third set of experimental data. It is suggested that the poor agreement between the predicted and measured bulk temperatures of the mixture for the third set of experimental data arises from the experimental errors. The results from this study show that when modeling vapor condensation in the presence of a non-condensable gas, a simple model for the mixture channel alone may not be sufficient since neither the temperature nor the heat flux at the wall can be assumed to be constant. The results also show that the wall temperature in the coolant channel can be quite high, and careful modeling of the heat transfer in the coolant channel is needed in order to achieve good agreement between the model predictions and the experimental results.     

Thermophoresis of particles in aqueous solution in micro-channel

A theoretical analysis of micro motion of particles under the action of thermophoresis in aqueous electrolyte solution is presented in this paper. A two-dimensional, incompressible and laminar fluid flow model is proposed to simulate the fluid flow and particle motion trajectory in micro-channel. The effects of thermophoretic force and viscous force on the particle are calculated. The particle trajectories considering the effects of particle size, inlet flow velocity and temperature difference between bottom side and top side in micro-channel with a length of 2000 μm and a height of 500 μm are simulated. The effect of thermophoresis on separation motion of particles in micro-channel is analyzed. The results show that thermophoretic force increases with the increase of temperature gradient in micro-channel and particles with smaller diameter, smaller density and smaller gravity acceleration can pass the micro-channel more easily.     

计算流体力学在发动机冷却水套设计中的应用

针对某三缸发动机在试验中出现的“拉缸”现象,应用STAR-CD软件对该机冷却水套中的流场和温度场进行分析,发现水套中存在大范围的低流速区和高温区,通过调整气缸垫中机体通往缸盖分水孔的大小和分布设计了改进方案,利用STAR-CD软件分析得到了最终的优化方案。     

Seasonal constraints in management of alternative sources of energy in rural areas

A plan for the management of alternative sources of energy, namely, wind, solar and biomass, available in a typical village of arid area has been formulated and it is found that the energy potential available in the village from mid February to mid September is much more than the energy requirement of the village; and during the remaining period the energy available is about 78.5 per cent of the energy requirement. Appropriate technologies for the effective and efficient use of these energies are earmarked so as to convert the energy potential available into useful energy.