液化天然气（LNG）拖头在盐田国际码头的应用

为建设绿色港口,进一步节能减排,盐田国际集装箱码头使用液化天然气（LNG）拖头。从技术成熟性、设备的市场供应情况以及安全和成本等几方面综合考虑,制定选用LNG集装箱拖头替代传统的柴油拖头的方案。详细介绍实施这一方案的方法。盐田国际（YICT）是全国第一个采用LNG拖头的码头公司。取得显著成效,可供借鉴。     

天然气重型发动机电控系统分析

介绍陕汽重型载货汽车T6114ZLQ3B型CNG天然气发动机电子控制系统的结构组成,阐述各相关部件的结构特点、工作原理和故障代码的读取。     

Well-to-wheel assessment of natural gas vehicles and their fuel supply infrastructures – Perspectives on gas in transport in Denmark

In this paper, potential natural gas and renewable natural gas supply pathways and natural gas vehicles (NGVs) have been selected and evaluated with regards to well-to-wheel energy expended, greenhouse gas (GHG) emissions, and regulated (air pollutant) emissions. The vehicles included in the evaluation are passenger cars, light-duty vehicles (LDVs), and heavy-duty vehicles (HDVs) for road-transport applications, and a short-range passenger vessel for maritime transport applications. The results show that, compared to conventional fuels, in both transport applications and for all vehicle classes, the use of compressed and liquefied natural gas has a 15–27% GHG emissions reduction effect per km travel. The effect becomes large, 81–211%, when compressed and liquefied renewable natural gas are used instead. The results are sensitive to the type and source of feedstock used, the type of vehicle engine, assumed methane leakage and methane slip, and the allocated energy and environmental digestate credits, in each pathway. In maritime applications, the use of liquefied natural gas and renewable natural gas instead of low sulfur marine fuels results in a 60–100% SOx and 90–96% PM emissions reduction. A 1% methane slip from a dedicated LNG passenger vessel results, on average, in 8.5% increase in net GHG emissions.     

Real-world gaseous and particle emissions of a Bi-fuel gasoline/CNG Euro 6 passenger car

The objective of the present study is the assessment of the environmental impact of a bivalent (bi-fuel) vehicle, running either on gasoline or compressed natural gas (CNG). To that aim, a Euro 6 passenger car was tested under various real-world driving conditions. In order to cover the full range of conventional powertrains currently in the market, the tests were also repeated on a Euro 6 diesel passenger car. Both cars were driven in two routes, the first complying with the regulation limits and the second going beyond them. Carbon monoxide (CO), nitrogen oxides (NO_x) and particle number (PN) emissions were recorded using a Portable Emissions Measurement System (PEMS). Apart from the aggregated emission levels, in g/km, the exact emission location along the route was also assessed. Natural gas proved beneficial for CO and PN emissions, the level of which always remained below the respective legislation limits. On the other hand, under the dynamic driving conditions with gasoline, the relevant limits were exceeded. Cold start, occurring at the beginning of the urban part, and motorway driving were identified as major contributors to total emissions, especially in gasoline mode. However, the application of natural gas was associated with a penalty in NO_x emissions, which were significantly increased as compared to gasoline. Local peaks within the urban part were identified in CNG mode. In any case, the diesel vehicle was by far the highest NO_x emitter.     

造船企业压缩空气管网水力计算分析

对某大型造船公司的压缩空气管网进行合理简化,得出可以用于管网水力计算的拓扑图,在此基础上建立各管段的压降方程、节点流量方程和环路能量方程等基本数学方程,最后选择几种基本的调度方案进行模拟计算,并分析和提出降低电能消耗可以采取的措施。     

菠萝庙船厂压缩空气站集中供气规划建议

本文主要阐述了菠萝庙船厂进行压缩空气站集中供气规划过程的一些设想,同时对我厂基础设施建设提出一些个人建议。     

国外城市交通政策回顾与我国城市交通的阶段性特征分析

近年来,我国的国家层面与部分发展较快的城市较为重视交通政策的规划、设计与研究,而中国的城市交通发展也处于一个敏感而关键的历史时期。论文对二战以后英国、美国、日本(东京)的城市交通政策的背景、导向、具体措施以及相关评价进行了回顾,并将其50年左右的发展分解为自由增长期、矛盾显露期、协调渐进期与优化整合期4个阶段。最后分析了我国所处的发展阶段,并认为部分发展较快城市所面临的问题与交通政策的规划设计正呈现出"叠合"式的特征。     

浅析汽车清漆缩孔的解决

在汽车面漆生产过程中,面漆缩孔是常见的缺陷,文章介绍了实际生产过程中对面漆缩孔问题,通过现场试验及验证,最终确定缩孔问题成因,有效解决了面漆缩孔问题。