天然气

With a gradual contraction longitudinal straight inlet port applied on the Multi-Point Injection natural gas engine, the concentration of natural gas and the pressure field in the intake manifold after the injection of natural gas were investigated, then in the following intake process the volocity vector map and mass distribution of natural gas inside the cylinder were also numerically examined.

在此基础上，考察了渐缩形直进气道应用於多点电喷天然气发动时，天然气喷射后进气岐管内的天然气浓度场和压力场，以及随后天然气-空气混合气在气缸内的质理分布和速度分布。

As a result, by merely replacing the gasoline injector with natural gas injector, a large volume of natural gas is injected on the intake valve and then reflected, which makes the fuel concentration and pressure field in the intake manifold after the natural gas injection for the natural gas engine differ greatly from those for gasoline engine.

结果表明，若仅把MPI汽油机的喷油器用天然气喷射阀更换，大量的天然气喷到进气阀后反射，造成天然气发动机进气岐管内的燃料浓度场、压力场与MPI汽油机明显不同；并且进气阀被打开后，先期吸入气缸的天然气在纵向滚流的作用下被挤向进气阀底部下方，与后期吸入气缸的空气形成明显的分层充气构造。

The ISO Upstream NaturalGas Technical Committee（ISO/TC193/SC3）is mainly engaged in standardization work in the upstream area of natural gas from wellhead to longdistance pipeline including allocation and measurement, wet gas measurement, and hydrate control and management.

国际标准化组织天然气技术委员会天然气上游领域分委会（ISO/TC193/SC3）主要从事天然气上游领域（从井口到进入长输管线前）的有关分配、测量、湿气、天然气水合物控制管理的标准化工作。

Through vehicles, ships etc, LNG can be transported to subordinate stations, then LNG can be supplied to all kinds of users after being evaporated.For the high cost and complicated crafts of the subordinate station"s construction, it has different features compared to normal crafts. The LNG craft needs the assistance of many crucial techniques. The aims of this book is to speculate on the feasibility of subordinate station"s construction after learning the properties, crafts of LNG and analyzing the crucial techniques.

由于液化天然气卫星站的建设是一项技术复杂的、投资较高的工程，具有与常规天然气输送工艺不同的特点，液化天然气工艺需要许多关键的技术支撑，本文的目的是通过对液化天然气的性质和工艺的了解，以及对关键技术的分析，来探讨城市LNG卫星站建设的可行性。

And strive to make sure a development direction of the China natural gas industry and make effort on settle a substructure of development.

中国天然气资源开发利用现状研究和对中国天然气勘探开发的技术经济分析表明，中国具有天然气工业发展的资源基础，具有天然气产业发展的广阔前景。

Years 9 on 9, China National Petroleum Group to Australia's largest oil and gas producer Woodside Petroleum to buy up to 45 billion Australian dollars worth of liquefied natural gas, the Bank of China the same day the conversion price, 1 Australian dollar to 6.2430 yuan to calculate, when the China National Petroleum Corporation's property for 280.935 billion yuan.

二千零七年9月9日，中国石油天然气集团对澳大利亚最大的石油和天然气生产商伍德赛德石油公司购买最多45亿美元的液化天然气，中国银行的同一天，澳元兑换价， 1澳元六点二四三零元计算，当中国石油天然气集团公司的财产为2809.35亿元。

Based on the achievements and developm ents in studying natural gas hydrates at home and abroad,the mechanism of causi ng the oil and gas reservoirs to be tightly sealed by the natural gas hydrates i s systematically analyzed in the paper through discussing the formation mechani sms,evolution properties and distribution laws of the natural gas hydrates.In li ght of the research on their control effects on petroleum accum ulation and reservoir preservation,several geologic models of oil and gas accumu lation and preservation related to the natural gas hydrates are proposed,such as vertically and laterally screened models,screened-by-drape and screened-by- contact models and syngenetically and epigenetically screened models,etc.

以国内外天然气水合物的研究成果和进展为基础，通过讨论天然气水合物的形成机制、演化特征以及其分布规律，系统分析了天然气水合物可以得天独厚地封盖油气藏的机理，探讨了其对油气藏尤其是气藏聚集和保存的控制作用，提出了天然气水合物聚集和保存油气的多类地质模式，如垂向遮挡和侧向遮挡、披覆遮挡和接触遮挡以及同生遮挡和后生遮挡等。

In this paper,experiments for measuring absolute adsorption of N 2, CO 2 and natural gas on 8 different artificial cores using an accurate porosimeter and an precise chromatographic instrument under room temperature (283～292°K) and low pressure (0 167～0 3MPa) have been studied.From these experiments,the following result...

实验结果表明：用 N2 测得的吸附气量在原始气中所占的比例为0 。4 %～ 4 %不等，CO2 的为 1 %～ 5%不等，天然气的为 3%～ 6%不等；吸附前后自由天然气的摩尔组成有显著的差异，表明岩心对天然气有明显的吸附；天然气各组分间存在竞争吸附，重质组分的相对吸附量大于轻质组分。

Seaborne Liquefied Natural Gas is an industry of high risk. Stevedoring operation of LNG is the key tache that being at the begning and the end of transportation at sea.

液化天然气海上运输是一种高风险的行业，液化天然气的装卸作业是海上运输起始和终止的关键环节，其安全性直接影响液化天然气海上运输事业的健康发展，对于液化天然气的安全利用起着决定性作用。

In only 12 month, Tanan Shenran 150 thousand M3 per day LNG project has finished the work from the very beginning to the very end. This project has created a milestone on China gas history, it is not only the first on constructing period, but also make many first on technology: The first self-owned intellectual property LNG plant which is nitrogen expanding and recycling refrigerating in China; the first plant which are all made in China; the first plant which use the parallel connection temperature expander refrigerate technology; the first use the pressure dryness vaporizer technology on Nitrogen gas liquefaction and purity system; the first use the deep fat stove technology in purity system; the piston nitrogen compressor is the biggest in China and etc.

短短12个月内，泰安深燃日产15万立方米液化天然气工程项目完成了从立项到投产的全部建设工程，该套项目的顺利投产完成创造了中国燃气史上的一个新的里程碑，不仅在建设周期上创造了第一，在技术方面同样创造了多个第一：我国首个具有自有知识产权的氮气膨胀、循环制冷液化天然气设备，填补了国内在这一技术领域的空白，对我国名族天然气液化事业的发展产生了积极的推动作用；首次实现设备国产化达到100%；首次采用并联双温区的膨胀机制冷技术；首次将等压干燥脱水技术应用于天然气液化系统、净化系统；首次在净化系统采用了导热油炉、单炉双温区共用形式；所采用的单级双列活塞式氮气压缩机位国内最大等技术。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。