共查询到20条相似文献，搜索用时 46 毫秒
1.
NaturalgasisbecomingwidelyusedincitiesofChina,andtherateofgasuseisveryhigh .Inrecentyears,especially ,alotofgaspipelinenetworkshavebeenequippedwithcomputermonitoringsystem .Thissystemcanmonitortheoperationofthegaspipelinenetworkinreal timeandgreatlyimproveworkefficiencyandman agementlevel[1,2 ] .Butthefactthatthedailyoperationofthegasdistributionnetworkisstillmanuallyperformedaccordingtoone′sexperiencedoesn′tmatchthesystem .Manualoperationcandealwithsimplegasdistributionsystem ,butasforcomp… 相似文献
2.
高温烟气在实际生产活动以及船舶、航天航空等领域均有大量涉及,而如何对其进行冷却是亟待解决的问题.本文以某实际管道内的高温烟气为研究对象,利用Fluent软件数值仿真不同喷射参数条件下管道内烟气的冷却过程,并对所得仿真结果进行对比分析.仿真结果表明:采用圆周上均匀分布8个喷孔,单个喷孔流量为0.05 kg/s时,可满足烟气冷却要求.基于数值仿真结果,设计了适用于该管道结构的冷却装置.本研究结果对管道内高温烟气的冷却处理具有参考意义,所设计的冷却装置具有实际应用价值. 相似文献
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SELEZNEV V. E PRYALOV S. N 《浙江大学学报(A卷英文版)》2007,8(11):1775-1788
This paper presents a method of forecasting stable operation of gas compressor unit (GCU) centrifugal supercharger (CFS) installed on a piping of compressor shops servicing gas pipelines. The stability of superchargers operation is assessed in relation to the phenomenon of surge. Solution of this problem amounts to the development and numerical analysis of a set of ordinary differential equations. The set describes transmission of gas through a compressor shop as a fluid dynamics model with lumped parameters. The proposed method is oriented to wide application by specialists working in the gas industry. The practical application of this method can use all-purpose programming and mathematical software available to specialists of gas companies. 相似文献
4.
介绍了输气管道仿真教学系统的构成和功能。在开发过程中,使用VC 来编制计算程序,根据已建立的各种数学模型对天然气长输管道系统的动态过程参数进行计算;同时使用工业组态软件来制作图形界面和建立数据库,将数据库中的变量与图形界面中的各图元相连接,通过实时更新数据库来驱动画面。这种仿真系统是操作者掌握天然气长输管道动态运行时全线压力过程的变化和对全线的监控的一个有效工具。 相似文献
5.
论文首先阐述了建立天然气长输管网信息系统建设的必要性和紧迫性,对系统的用户需求进行了分析,论述了系统的设计原则、目标。研究了天然气长输管网信息系统的总体设计和功能模块设计。并针对目前我国天然气长输管网数字化建设的设计、竣工等资料,以及设备信息和数字化管网运行阶段的信息特点,论述了系统数据库的内容和组织,并设计系统数据库,对管网进行完整性管理。最后论文以具体项目为研究对象,构建了天然气长输管网信息系统应用平台。系统实现了管道地理信息管理、日常生产管理,管道巡检,以及安全决策等相关功能,为各级天然气管理部门提供了实用的管理决策依据。 相似文献
6.
输气管道泄漏音波信号在传播过程中高频部分迅速衰减,低频部分能传播较远的距离.根据这一特点拟合仿真信号模型,以信噪比和均方根误差为指标对傅里叶变换、维纳滤波、中值滤波和小波分析进行对比分析,结果表明：小波分析去除背景噪声具有较高的信噪比和较小的均方根误差,中值滤波次之,维纳滤波和傅里叶变换最差. 相似文献
7.
利用计算机网络系统构建原油长输管道控制平台，以网络中不同的工作站模拟长输管道SCADA系统的控制中心及各泵站控制终端。作者以大庆至铁岭输油管道为背景开发了管道运行离线仿真软件和通讯软件，并且开发了与现场一致的虚拟操作界面，建成了输油管道仿真教学系统。 相似文献
8.
针对网络控制系统的数据丢包问题,提出将网络控制系统中的丢包问题等价地转换为k采样周期网络控制问题,进而通过变换将k采样周期的网络控制系统等价转化为变时延网络控制系统。在此基础上,将李雅普诺夫稳定性理论与线性矩阵不等式方法相结合,给出这种变时延网络控制系统的稳定性判据和控制器设计方法。最后通过仿真结果验证了文中方法的有效性。 相似文献
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针对当前燃气输配场站运维管理缺少有效的协同管理平台、信息化水平低的问题,将BIM技术引入到燃气输配场站运维管理之中。结合唐山市某燃气输配场站实际工程案例,进行燃气输配场站BIM运维模型的构建,并对基于BIM的输配场站的运维信息管理、设施设备维保管理、管线综合管理、资产管理等方面进行应用研究。研究结果表明,将BIM技术应用于燃气输配场站的运维管理之中,可以实现燃气输配场站工程运维的三维可视化管理和各类运维信息的集成管理,为燃气输配场站参与运维管理的各方提供信息共享和协同管理的平台,能够有效提升燃气输配场站运维管理效率和信息化水平。 相似文献
11.
CFD Analysis of Gas Distributor in Packed Column--Prediction of Gas Flow and Effect of Tower Internals Geometry Structure 总被引：1，自引：0，他引：1
Computational fluid dynamics (CFD) simulations were carried out on the gas flow patterns of twin-tangential annular deflector gas distributor in the absence of liquid flow in a packed column (6.4 m in diameter), and the gas flow field in the column was presented close to reality on the whole. Furthermore, after ame-lioration of this gas distributor frame, turbulence energy and turbulence energy dissipation rate were both decreased greatly.Simulation results showed that the flow pattern and the distribution of gas flow were strongly affected by the column bottom frame; the proper column bottom frame could decrease the flow pressure drop greatly. Multifold factors, such as the column bottom geometry structure and distributor structure which affects the distribution capacity, must be considered. 相似文献
12.
论文分析了我国天然气联网的趋势及联网后天然气市场格局的变化。借鉴了联网条件下天然气市场变化的国际经验,利用市场营销学4P理论分析了天然气管道联网对产品、价格、渠道、促销四个方面的影响,提出了适应联网的营销策略。 相似文献
13.
Biogas from renewable sources and natural gas (NG) are both high-efficient and good-quality gaseous fuels on account of their enrichment in methane. Due to the dissimilar physical properties of biogas and NG, biogas cannot substitute NG directly without treatment and is usually used on site due to the high cost of the transportation and distribution via exclusive pipeline system. Consequently, the injection of biogas into existing NG infrastructure was proposed to address the deficiency. In this paper, the Wobbe index (WI) as well as the combustion potential (CP) were introduced for analyzing the interchangeability of an NG-biogas mixture, and a mathematical framework was put forward for modeling and simulating NG grid with a decentralized biogas injection. Results show that the maximum admissible amount of biogas in mixture was 10.5 by volume. A medium pressure network was used to interrogate the comprehensive effect of distributed biogas injection, which showed an impact on both gas quality and hydraulic regime across the grid. 相似文献
14.
CFD Analysis of Gas Distributor in Packed Column ——Prediction of Gas Flow and Effect of Tower Internals Geometry Structure 总被引：2，自引：0，他引：2
Asoneofinternalparts,thefeedgasdistributorplaysanimportantroleinapackedcolumn.Thesmoothoperationandbetterqualityofproductsaregreatlyinfluencedbyitsperformance,especiallyinthecolumnwithlargediameter,shortpackedbedandlowpressuredrop.Duetotheimpor tanceoftheuniformityofinletgasdistribution ,itisessentialtodesignagoodfeedgasdistributor.However,fewtheoreti calandexperimentalapproacheshavebeencarriedoutinthisareasofarduetothecomplexityofthefluidflow[1 ,2 ] . Theliquidflowstructureisimprovedbyanew… 相似文献
15.
根据液压传动课程的教学内容和特点,通过实例说明流体动力学软件Fluent在教学中的应用,直观展示了流体在元件内部的流动情况,速度、压力的定量分布规律,依此分析结构对流动特性及元件性能的影响。仿真教学有助于学生掌握抽象的流体力学理论,加深对元件工作原理的理解及仿真设计方法的使用,拓展了现有的教学方式,加强了教学与工程应用之间的有机结合。 相似文献
16.
Using data from the super-sample of the ‘PISA Suisse’ 2003 assessment, this article examines the relationship between the characteristics of education systems (made up of homogeneous or heterogeneous tracks) and their consequences in terms of effectiveness and equity. Our results indicate that it is not so much the official structure of tracks as the ways in which tracking is really organised – and, in particular, the degree of segregation that tracking methods involve – which make it possible to explain inequalities among students. They also show that some education systems are more inegalitarian than others and that the factors leading to inequalities can vary significantly from one Swiss canton to another. Finally, through multilevel analyses, we demonstrate that when the individual and aggregate characteristics of students are taken into account, the type of track a student attends is of only limited significance for explaining inequalities, which suggests that the effects of tracking are in fact linked to the nature of the population educated in the tracks. 相似文献
17.
煤层抽放钻孔合理封孔深度的确定 总被引：4，自引：0，他引：4
钻孔的合理封孔深度不仅是瓦斯抽放的一个重要环节,而且是提高瓦斯抽放效率的关键;采用合理测定“三带”的方法,在顾桥矿1117（3）工作面进行了试验,通过数值模拟软件的模拟,得出了顾桥矿1117（3）工作面预抽钻孔的合理封孔深度,从而为高效的实现瓦斯抽放打下坚实的基础。 相似文献
18.
Dependent on automatically generated unstructured grids, a comprehensive computational fluid dynamics(CFD)numerical simulation is performed to analyze the influence of nozzle geometry on the internal flow characteristics of a multi-hole diesel injector with the multi-phase flow model based on Eulerian multi-fluid method.The diesel components in nozzle are considered as two continuous phases, diesel liquid and diesel vapor respectively.Considering that both of them are fully coupled and interpenetrated, sepa... 相似文献
19.
梁金禄 《四川三峡学院学报》2013,(3):60-63
为了迎接低碳高效的天然气＂蓝金＂时代,广西从国家北部湾大开发战略高度出发,大力推进天然气管网建设,布局LNG接收站来保障多气源联动供气,推进城市燃气和车船用气改造、加气站建设,大力开发天然气分布式能源利用,并且理顺天然气定价体制,以及建立技术人才培养和保障制度,这些技术策略的实行使得广西大跨步进入天然气时代. 相似文献
20.
According to the problem during mining coal seam with high gas and its control, the theory numerical calculation of gas and strata movement law caused by protection layer mining was studied, with the background of Snake Mountain coal mine. First of all, the basic principle of fluid (gas)-solid coupling was briefly described, and a three dimensional model was established by FLAC software. Secondly, the calculation parameters of fluid-solid coupling were obtained based on the measured data, and the numerical calculation of sublevel mining was carried out in turn. Lastly, initial stress state, gas movement law, deformation law of pore pressure and movement characteristics of rock strata were studied, respectively. The results show that the gas and pressure were greatly reduced with the advance of 4 coal seam working surface, as well as the constant increase of area of goaf. Facilitating gas and the stress were gradually penetrated and released to goaf during the whole process of mining. The gas pressure, the aggregation degree and the surrounding rock pressure of the 1 coal seam and the 3 coal seam were greatly reduced. 相似文献