查询词典 natural gas

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

The feasibility of changing natural gas into water gas was discussed in aspects of flaming gas exchangeability and combustion characteristic parameter.

从燃气的互换性以及燃烧特性参数等方面对水煤气作为原油输运加热炉替代燃料进行了可行性分析。

In Moss Landing, a huge natural gas power plant owned by Dynegy spews dirty gray smoke, called flue （ a pipe or tube that takes smoke, gas or hot air away from a fire, a heater or an oven ） gas.

在加州摩斯兰丁，「戴那基」公司拥有的一座巨大天然气电厂喷出污浊，名为烟道废气的灰烟。

Characteristic: 1st, when water flowing not the pressure damages; 2nd, non-contact induction signal sample; 3rd, guards against the dripping of a water clock, the size current capacity does not have the error; 4th, the installment does not divide the direction; 5th, table when assembly the disposable tack-dry, prevented cheats; 6th, can generate electricity the outer loop work to use electricity voluntarily, lengthens the battery period of revolution; 7th, the battery can replace voluntarily, the magcard box and the battery box are equipped with the self-locking security function; 8th, has the magnetization to guard against the boiler scale function; 9th, this table lifelong does not use the dial gauge; When 10th, this table uses in the natural gas and the liquid gas, whether there is can in the automatic detection room the air noxious gas, if has can start the exhaust fan automatically (exhaust fan switch with this table connection), and the automatic shut-off table valve, plays the safe role; When 11th, this table uses in the warm air, according to the temperature, the time, the area cost, the temperature could not achieve the stipulation cost, the user cannot act according to own current economic condition to open at will stops, and is equipped with the frostproof function, to does not need the warm air the heating equipment not to be able for a long time to ruin by freezing.

特点：1、水流动时无压损；2、非接触感应信号取样；3、防滴漏、大小流量没有误差；4、安装不分方向；5、表在装配时一次性粘固，防止作弊；6、能自行发电补充电路工作用电，延长电池使用时间；7、电池能自行更换，磁卡盒和电池盒设有自锁防盗功能；8、具有磁化防水垢功能；9、该表终身不用校表；10、该表用于天然气和液化气时，能自动检测室内空气有无有害气体，如有能自动启动排气扇，并自动关闭表阀，起到安全作用；11、该表用于暖气时，根据温度、时间、面积计费，温度达不到规定不计费，用户可根据自己的经济条件随意启停，并设有防冻功能，对长期不用暖气的采暖设备不会冻坏。

Study on adsorption in porous media of reservoir is very important for phase equilibrium calculation of condensate gas and the right way of insight at the gas or condensate gas reservoir.In this paper,experiments for measuring absolute adsorption of N2, CO2 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 results can be obtained:i.

利用高精度孔隙度测定仪和气相色谱分析仪，采用恒体积法，测定了室温(283～292K)、低压(0.167～0.3MPa)下N2、CO2和天然气在8个不同的岩心孔隙内表面的吸附量，对于天然气，还测定了吸附前后自由气体的摩尔组成，被吸附气体的摩尔组成和天然气各组分的相对吸附量。

Owing to the loss of product and unsafe circumstance when oil-gas products were loaded into uncorked tank cars in petrochemical enterprises, an improved technique was obtained by the following measures in Zhongyuan Oil-field Natural Gas Process Factory: using the technique of close loading and oil-gas absorption with current nontoxic diluent as absorber at low temperature, the oil-gas vaporized was recovered and returned to the raw material processing.

针对石化企业敞口槽车充装油气产品造成产品损耗及安全隐患的情况，中国石化中原油田天然气处理厂利用密闭装车技术和低温吸收技术，以现有的无毒稀释剂作为吸收剂，将气相挥发产品回收并返至原料重新处理，成功地对原工艺进行了改造。

Various factors influencing natural gas hydrate f ormation were studied in laboratory,including gas composition,temperature,pressu re,water saturation,ion concentration,gas stirrin g and carbon dioxide gas,etc.

本文主要就影响天然气水合物形成的各种因素进行实验研究，包括气体组成、温度压力、含水饱和度、离子浓度、气体搅拌、CO2 酸性气体等的影响。

All in all, TRZ series elastic sealing gas valve suitable for gas pipelines, particularly suitable for underground gas pipeline, from the study of the situation abroad, many countries have adopted flexible natural gas pipeline valve plate, the same nominal diameter flexible valve plate Compared with the ball, have fire protection features, the price is about 30% lower than the ball, use the same effect.

总而言之，TRZ系列弹性密封燃气闸阀适用于燃气管线，特别适用于地下燃气管线，从国外考察的情况来看，许多国家的天然气管线上都采用弹性平板闸阀，同公称通径弹性平板闸阀与球阀相比，都有防火功能，而价格比球阀低30%左右，使用效果相同。

Tight gas sandstone takes a large proportion in all natural gas reserves in China. Understanding the tight gas sandstone correctly is the most important thing in the sand gas reservoir development.

在我国，致密含气砂岩中的天然气储量占全国天然气总储量的比例较大，而正确地认识致密含气砂岩，是开发好致密砂岩气藏的首要条件。

Russia and Ukraine have been disputing more intensify in gas prices and gas transit issues for many years. The natural gas dispute between the two countries has become regular program after the"Orange Revolution". At the beginning of this New Year, a"gas war"once again cast a shadow on relations between Russia and Ukraine. But an agreement ultimately has been reached between the two countries through many times coordination by the European Union, that means the end of the struggle.

多年来，俄罗斯和乌克兰两国在天然气价格和天然气过境问题上的争执愈演愈烈，两国之间的天然气纠纷几乎成了&橙色革命&之后的定时节目。2009年初的一场&天然气大战&再次给俄乌关系蒙上阴影，但在欧盟多次协调下两国最终以达成协议方式而结束了争斗。

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。