美国风电两年翻一番达2000多万千瓦

美国风电发电量在过去两年翻了一番达列2000多万千瓦。美国风电协会预计到今年年底总装机将达到24．3吉瓦。美国能源部预测,到2030年美国20％的电力需求将来自风电。美国风电协会担心,如果联邦制政府年底不延长就要到期的生产课税扣除政策,风电的潜力不可能全部发挥出来。生产课税扣除即风电每发一度电,增加2分钱收入。     

世界风电发展形势及我国风电制造业面临的机遇

世界风电在近10年取得了飞速发展,在欧洲和美国已经成为新增主力发电电源之一.文章从技术、装备和市场发展等角度总结了世界风电的最新进展,着重介绍了2008年后美国、德国、西班牙等风电大国政策的调整和支持风电发展的实际行动,提出未来世界风电市场潜力巨大,国内风机制造企业应及早准备,积极开拓国际市场.     

生态友好型风电光伏发展建议

我国风电光伏呈现快速发展态势,地方政府与开发商在平衡风电光伏发展与生态环境保护方面面临着诸多挑战.为助力我国风电光伏与生态环境的友好发展,本文一方面通过文献综述系统梳理了风电光伏建设运营对生态环境产生的影响,另一方面借鉴了德国与丹麦的发展经验,提出了生态友好型风电光伏发展的建议.     

美国首座海上风电场“深海风电项目”即将建成

正1月21日,美国首座海上风电场"深海风电项目"即将建成,规模为30 MW.该项目于2015年春季开工,近来一期部分已建设完成,预计2016年初将全部建设完成.这预示着美国能源领域一个里程碑事件的诞生."深海风电项目"采用的风电机组是GE风电机组中最大,也是全美风电机组中最大.可供应罗德岛     

风电产业发展年度报告

2010年对于我国风电产业而言,是极具里程碑意义的一年:作为"十一五"的最后一年,经过近五年时间的大发展,我国风电装机在"十二五"到来之前终于超过美国跃居世界第一;我国风电技术进入了国际先进行列,各类型风机均可实现国产化,大容量机组相继出现;风电产业高度市场化,国有、民营、外资企业共同发展,独资、合资多种     

2012天津风电产业创新论坛召开

2月27日～28日,2012天津风电产业创新论坛在天津召开,这次论坛由天津市风能协会主办,并以"回顾、展望、创新"为主题,关注风电产业转型期的发展,论坛吸引了来自政府、行业协会、风电企业、高校以及科研单位等领域的     

美国风电发展面临四大挑战

美国是世界上的风电发展大国。2012年6月,美国风电累计装机容量超过5000万千瓦,全国约2.9%的电力来自于风电。美国还制定了一项更宏伟的目标,即到2030年,能源消费总量中将有20%来自风电。这意味着美国风电的发展将继续高歌猛进。但事实上,这几年美国的风电产业并不如意。2010年和2011年美国年均新增风电装机量较2009年下降30%以上。未来,面临不确定的补贴政策、持续低廉的天然气价格、地域劣势以及民众的抗议,美国风电发展面临着众多挑战。不确定的补贴政策美国的风电产业是在税收减免政策的扶持下成长的。     

2010年度新兴能源行业10大新闻

2010年风电10大新闻TOP 1我国风电总装机或超越美国成世界第一在2010年10月召开的"2010中国能源企业高层论坛"上,国家能源局副局长吴吟明确指出,"我国风电总装机将在年底超美国,成为世界第一"。统计数据显示,至2010年年中,我国风电装机容量已超过3000万kW,据业界专家的预测,到     

加快我国风电产业的发展

经过20多年的努力,我国风力发电通过"科技攻关"、"863计划"、"光明工程"和国际合作等一系列项目的实施,积累了不少的经验,为加快风力发电产业发展打下了基础,特别是<可再生能源法>正式实施,将为我国风电产业发展提供良好的机遇.但是,我国风电产业发展也面对着挑战,所以要重视近期我国风电产业发展的重点,加大投入,提升我国风电制造业技术水平和创新能力,鼓励支持科研院所和有实力的企业建立风电研发中心.     

明阳的明天

正作为一家于美国纽交所上市、在中国风电市场有稳健表现的民营公司,明阳的发展背后究竟有什么样的商业逻辑?3年,是明阳风电集团(以下简称明阳)从首台1.5兆瓦风电机组下线到在美国纽交所上市的时间。只要在明阳的历程中看到这一节点,你就可能吃惊她的"快"。但此后的装机增长中,这家公司并没有"一快再快",而是采取了相对稳健的前行策略。     

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。     

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。     

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。     

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.     

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.     

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.     

EMD在柴油机燃烧不良诊断中的应用

介绍了经验模态分解(EMD)方法的基本原理和实现过程,并应用该方法对柴油机气缸盖上面采集到的非线性非稳态复杂信号进行了分解,获得了线性稳态的本征模函数(IMF)信号。每个本征模函数信号包含了比较单一的故障特征,对其进行功率谱密度分析最终找到了产生剧烈振动的激振源激振频率。分析、判断激振的频率可以知道产生剧烈振动的最终原因为燃烧不良。现场拆装发动机缸盖部分发现喷油孔严重烧损,验证了结论的正确性。     

FHDO技术在混合二甲苯脱烯烃中的工业应用

催化重整生成油中富含芳烃和少量烯烃,要想生产合格的芳烃产品,必须脱除其中的烯烃。目前,广泛采用的脱除烯烃的方法是白土吸附和加氢精制工艺。抚顺石油化工研究院开发的FHDO技术,在成功应用于重整生成油苯、BTX等馏分脱烯烃基础上,首次在安庆石化1.0Mt/a催化重整装置混合二甲苯精制单元实现工业化应用。FHDO技术在较低反应温度(120~170℃)、反应压力(1.0~1.8MPa)、反应空速2~4h-1和氢油比(200~500∶1)下,生产出符合GB/T3407—2010的混合二甲苯产品。运行结果表明,HDO-18催化剂具有良好的活性和选择性,适用于催化重整生成油混合二甲苯馏分选择性加氢脱烯烃,FHDO技术可以有效替代常规的白土吸附和加氢精制工艺,从而彻底解决了常规混合二甲苯脱烯烃工艺中白土使用寿命短、需要频繁更换和废弃白土污染环境问题,以及加氢精制工艺在深度加氢脱烯烃过程中,带来的芳烃损失偏高等问题。FHDO技术的成功应用,填补了国内在催化重整生成油混合二甲苯馏分选择性加氢领域的空白,也是今后芳烃脱烯烃工艺的发展趋势。