高压天然气流量计现场在线实流检定

介绍了引进的车载移动式标准表法的天然气流量标准装置的构成、不确定度分析及验证方法;使用该标准装置开展流量计现场实流检定时,保证流量计检定结果准确可靠应采取的措施,现场检定工艺流程和检定结果;并就流量计现场检定问题对计量站的设计提出了建议.实践表明,对天然气流量计实施现场在线实流检定可以有效地提高流量测量的准确度.     

移动式高压大流量天然气实流检定装置设计与实现

利用0.2级标准涡轮流量计,建立综合不确定度小于0.33%(k=2)的移动式高压大流量天然气实流检定装置,实现1.0级流量计的在线实流检定。文章从装置的工艺流程设计、标准/核查流量计的选择、监控与数据采集/处理系统,辅助功能设计等出发,论述如何用0.2级标准流量计满足检定1.0级流量计的要求,并且用实流台位和固定台位测试对比的方法,验证0.2级标准涡轮流量计和0.5级核查超声波流量计在移动标准装置上应用的可靠性和准确性。车载移动式高压大流量天然气流量标准装置克服了拆送检定过程中对流量计的损伤和影响以标准器溯源上的诸多不便,越来越受到用户的重视和采用。     

mt法天然气流量原级标准装置

介绍了西气东输计量测试中心工程正在建设的mt法天然气流量原级标准装置。该装置以天然气作为介质,能在高压条件下（5．0-9．6MPa）对标准喷嘴及高准确度的流量计进行检定,实现流量量值的溯源。该装置建成后可作为我国高压天然气流量计量的最高标准。     

《临界流文丘里喷嘴法气体流量标准装置》校准规范介绍

音速喷嘴作为一种气体流量计,由于其良好的长期稳定性及相对较低的价格,作为气体流量标准装置中的标准表在我国大量使用,目前国内已有此类装置几十套,每年量传的气体流量计达十几万台。虽然JJG643-2003《标准表法流量标准装置》检定规程对使用标准表的流量标准装置的检定已经进行了规范.     

启停质量法与标准表法集成油流量计检定系统研发

标准表法流量计检定系统以标准流量计作为标准器,使流体在相同的时间间隔内通过标准流量计和被检流量计,比较两者的输出流量值,从而确定被检流量计的计量性能。标准表法油流量标准装置主要由油流量源、试验管道、标准流量计、控制设备及系统组成,检定效率相对较高,但根据量值传递关系,其检定准确度受限于标准表的准确度。     

标准表法天然气流量标准装置的应用

随着天然气市场的发展，天然气流量计量越来越受到人们重视。计量检定是保证数据准确的前提，而天然气流量的实流检定是目前理想的检定方法，能解决传统检定方法所不能解决的难题，随着技术和市场的成熟，El前已具备推广的条件。本文介绍了中原油田的天然气流量计实流检定装置的组成及特点。     

高压天然气流量标准装置

介绍了我国新建的南京计量测试中心高压天然气流量标准装置建设的背景、站址条件、工艺流程、各级流量标准装置的构成和技术指标、流量量值传递框图及保证流量量值准确、可靠所采取的措施.高压天然气流量标准装置包括原级标准、次级标准、工作标准和移动标准,可以直接以高压天然气为介质对各种类型的气体流量计进行检定或校准.文中还给出了次级标准的比对试验结果和国际上现有的主要天然气流量标准装置的检定能力比较表.     

温度湿度对天然气流量计离线检定的影响

天然气流量计量是天然气生产、输送和销售的关键环节,其计量用流量计多为离线检定,检定结果的准确与否直接影响着现场计量的准确程度。该文就音速喷嘴法气体流量标准装置(负压法)检定气体流量计过程中的温度、湿度分别分析探讨了对流量计检定结果的影响,对气体流量计离线检定的规范化管理及操作具有重要意义。     

浮子流量计检定装置的研制

介绍了一种型号为LB311非水液体浮子流量计检定装置,该装置基于标准表法,采用一大一小离心泵来提供稳流源,用涡轮流量计作为标准表来检定浮子流量计,测试流量范围宽;采用三阀调节系统,调节精度高.     

天然气大流量计量装置管路流场对检定的影响分析

在国家天然气计量站大流量检定系统的应用过程中,由于工作需开启不同的检定管路,所实施的核查级标准表和被检工作表具有多样化的组合方式,且工作流量较大,其检定结果准确度非常易受介质流场不稳定性的影响。为此,基于典型大流量检定装置的流程模型,通过采用FLUENT模拟不同检定口径在不同流量点下的不同工作组合模式,计算得到不同管路工作条件下的天然气体积流量测定误差值。研究分析结果表明:计量站的标准表不同组合方式工作条件对检定工作质量具有不同的影响,工作管路的口径越大而造成的介质流动不稳定性产生的检定结果准确度影响越明显,通过改善检定系统中标准表与检测表的管容和增大进、入口管路的间距可降低检定误差,从而一定程度地消除介质流动状态带给计量检定的影响,有效提高天然气计量检测的量传水平。     

SO x emission and pollution control at Mellitah Gas Plant

Due to the increase of energy consumption, natural gas energy is becoming one of the most important sources to fulfil the world energy demand. However, normally the available raw natural gas is mixed with some heavy components such as C₃ ⁺ and/or some impurities such as CO₂, N₂ and sulfur compounds (H₂S and RSH). The raw gas should be treated in order to meet the international specifications and eliminate or at least minimize the emission of toxic and/or pollutant gases to the surrounding area. Mellitah Plant applies the latest technology in order to meet the international standards. In this paper, we will present the different process at Mellitah site in which we produce a clean natural gas for export and recover 99.8 wt% of associated sulfur compound with the raw gas and/or acid gas. The recovered sulfur is produced in liquid phase then dried for storage in solid phase. The solid sulfur is exported to international market. The emission control at Mellitah plant is optimized and controlled as per the latest available technology. The fuel gas utilized for all the process is completely clean gas; flue gas contains always less than 10 ppm of H₂S. Therefore, the burned gas produced mainly CO₂ and H₂O with a trace amount of SO _x . If SO _x emission at Mellitah is compared to any other industrial complex in Libya or any other similar plant any elsewhere utilizing fuel oil and/or diesel oil then the Mellitah emission will be the lowest. An erratum to this article can be found at     

天然气组分检测定性与定量方法的探讨

针对目前天然气组成分析的现状，通过实验验证GB13610-2003《天然气的组成分析气相色谱法》的两个不足，并提出相应的改进办法。     

Catalyst nanocomposites templates of carbon nanoribbons, nanospheres and nanotubes

Several attractive types of amorphous or crystalline carbon nanostructure were obtained by a single catalytic process, during natural gas decomposition using different nanostructured catalysts as template. The nanostructured catalyst templates were based on transition metal nanoparticles embedded in carbon matrixes and nanoceramic supports which consist of magnesium oxide doped with ceria rare earths, prepared by the high-energy mechanical milling. The yield and the nature of the nanostructured carbon are strongly influenced by the preparation method of the template and the chemical composition of the catalysts.     

气体流量量值溯源体系探讨

介绍了气体流量量值溯源中的关键环节,并对各环节的国际发展趋势进行了简单介绍.     

Study of the dispersion of natural gas issuing from compressor stations through silencers with upper cover

The aim of the present study is the simulation of the dispersion of natural gas issuing from the silencer of compressor stations during vent operations. The objective is to analyze the dispersion of the gas emitted under different conditions of mass flow rate at the exit and ambient cross-flow velocity. We have considered a silencer with an upper cover to protect it from the rain and the fall of objects. The influence of the upper cover of the silencer on the dispersion of natural gas has also been studied, and non-dimensional approaches of the model have been proposed to simplify the problem. Seven different cases have been solved, using two models: a 3D model based on the commercial code FLUENT, and a simplified quasi-one-dimensional model. The results obtained in both cases have been compared, and the range of validity of the one-dimensional model in non-dimensional form has been discussed.     

基于图像处理技术的天然气表检测

针对传统天然气检测系统存在的检测效率低和准确性不高的问题,提出了基于显著形状特征的天然气表数字图像识别方法,通过对数字外轮廓进行简洁、高效的编码,并辅助数字长宽比、内腔等其他形状特征,从而能同时识别整字和半字出现的情况,即而实现了气表检测过程中读数的自动化。实践证明,新系统的检测效率大为提高。     

Challenges in providing technical information for societal use: Examples from the gas resource assessment community

Assessments of likely sources of natural gas incorporate scientific, social, and cultural elements, and illustrate the complex interactions of economics, science, engineering, and social factors in the perception of natural resources. Two groups produce assessments of the potential natural gas resources of the United States: the private sector Potential Gas Agency and the public sector US Geological Survey and Minerals Management Service, which produce joint national reports. Both groups use similar technical methods but have adopted different operational structures that reflect different practices and norms in the public and private sectors. Both groups have encountered difficulties in communicating their technical information to the non-technical community, leading to legal and political interventions. These applied science programs meet the criteria for scientific success, but have room for improvement in meeting the needs of society.     

中压天然气流量计实流标定中气体压力、温度的影响及控制方法

论述在中压天然气流量计实流标定中,调压及流量点调节弓{起检定用天然气各参数变化对测量准确度的影响。并讨论了中压天然气流量计实流标定中天然气压力和温度的控制调节方法,保证检定用天然气各参数的波动符合检定规程的要求。     

Dynamic Viscosity Measurements of Three Natural Gas Mixtures—Comparison against Prediction Models

New and accurate viscosity measurements of three natural gas mixtures obtained directly at three different locations in the Norwegian gas transport network in the North Sea are presented. The viscosity measurements were performed using a vibrating-wire instrument with an uncertainty of ± 1%, and covered a wide range of temperatures and pressures (263–303 K and 5.0–25 MPa). The predictive power of various models was also examined in relation to our new viscosity measurements. It was found that one of the Lee–Gonzalez–Eakin variants, as well as the NIST’s SUPERTRAPP scheme, agreed very well with the present measurements. The correlative schemes reported by Schley et al. (Int J Thermophys 25:1623, 2004) and Vesovic–Wakeham (Int J Thermophys 22:415, 2001) were found to deviate significantly from the present measurements.     

湿度变化对置换法气体小流量装置影响的研究

测量了不同温度、不同湿度下的压缩空气和高纯氮气以不同流量进入装满水的容器后的湿度变化情况;分析了气体湿度变化对置换法气体流量装置的影响,提出了用气囊或隔膜把被测气体和水隔离的解决方法。