军歌壮三峡

2000年金秋，出席北京“第二十届国际大坝会议”的70多名中外水电专家云集湖北宜昌，兴致勃勃地参观了建设中的长江三峡水利枢纽工程。当他们亲眼目睹堪称世界之最的永久船闸时，都禁不住对世界水利史上的这一空前壮举击掌叫绝，称赞它是中国当代军人的惊世之作。江泽民、李鹏、朱镕基、李瑞环、胡锦涛、尉健行等党和国家领导人视察三峡期间。     

直喷汽油机轿车燃用不同比例甲醇汽油时的颗粒物排放特性

为了研究燃用不同掺混比的甲醇汽油对装备有直喷汽油机的整车颗粒物排放的影响,对一辆帕萨特轿车在新欧洲驾驶循环条件下燃用93#国Ⅳ汽油,以及以其为母油配制的M15、M25、M40三种甲醇汽油时的颗粒物质量和数量浓度进行了测试.结果表明,随着燃料中甲醇比例的增加,颗粒物质量呈明显下降趋势,而颗粒物数量却呈快速上升趋势.相比燃用市售汽油时,燃用M15、M25、M40三种甲醇汽油的颗粒物质量分别下降了33.2％、36.5％和40.2％,而颗粒物数量则分别增加了14.4％、15.7％和23.6％.     

Particles Emission from Gasoline Vehicles

Number concentration and size distribution from gasoline cars are investigated at transient modes on the chassis dynamometers,which are measured using electrical low pressure impactor (ELPI) for the ECE15 and EUDC cycles.Results indicate that,during cold start,particle number emission is higher than that under hot start.It is found that the number of particles increases with the vehicle speeds.Furthermore,particles with diameter smaller than 200 nm constitute the predominant part of total emission in the entire cycle.In addition,the tentative information about composition of emitted particles is also discussed.     

Regulated and Speciated Hydrocarbon Emissions from a Dual Fuel Light Duty Vehicle with and Without a Three-Way Catalyst

The regulated pollutants (CO,HC and NOx) and unregulated pollutants (volatile organic compounds and carbonyl compounds),emitted from a dual fuel vehicle fueled with gasoline and E10 fuel,are measured under a transient cycle and steady modes.The impacts of a three-way catalyst (TWC) are investigated for the two types of fuels.The measured results show that NOx and acetaldehyde emitted from the E10-fueled car are much more than that from the gasoline-fueled car under the same modes.On the basis of maximum inc...     

生物柴油发动机PM排放的理化特性研究

在1台直喷式增压柴油机上进行了生物柴油B100、柴油和掺混油B20的排放特性试验,对3种燃料排放颗粒物的物质形态、数量浓度以及化学组分等理化参数进行分析研究.试验结果表明:生物柴油的排放颗粒物形态与柴油机排放类似;比表面积BET、挥发性物质VOF比例和数量浓度均高于柴油机排放;总PAHs低于柴油机排放,但五环PAHs和BaP排放高于柴油机排放;在柴油机排放颗粒物元素分析中发现有硫元素.     

Size Distribution of Particles Emitted from Liquefied Natural Gas Fueled Engine

The results of measurements conducted to determine the number and mass concentration of particles emitted from the liquefied natural gas (LNG) fueled spark ignition engines are presented. Particle size distributions were measured at different speeds,different loads and ESC cycles. The nanoparticles with diameter smaller than 39 nm,measured by the electrical low-pressure impactor (ELPI),are dominant in number concentration that is nearly 92.7% of the total number of the emitted particles at the peak point. As for the mass of emission particle,it is shown that the mass of the particles greater than 1.2 μm is more than 65% that of the emitted particles.