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CD5#城市配气站工艺设计设计计算书毕业论文.doc

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CD5#城市配气站工艺设计设计计算书毕业论文.doc

摘要天然气作为一种优质能源,在全球范围内得到普遍发展,它清洁、经济、方便、用途广泛。天然气长输管线、城市配气系统应运而生。而城市配气系统又是从配气站开始的,天然气在配气站内经过除尘、调压、计量、添味后,然后通过各级配气管网和气体调压装置保质保量地根据用户要求直接地向用户供气。本文通过确定配气站的流程,根据已知条件进行设备计算及选型等完成配气站的工艺设计。本设计的流程为中低压天然气从分别经调压分离后进入1号汇管,再经过调压后进入2号汇管,从2号汇管出来的气体要流经三条管线,其中两条是供给用户的,在这两条管道上均安装有流量计,剩下的一条经调压后进入3号汇管,从3号汇管出来的气体会流经四条管道提供给四个用户,在这四条管道上均安装有流量计。在设备选型方面,分别对管线,汇管,阀门(闸阀、调压阀、安全阀等),分离器,流量计等进行计算并选型,对添味装置以及仪表如压力表,温度计进行比较选型。关键词天然气配气站工艺流程工艺设备AbstractAsakindofhighqualityenergyresources,naturegasisgenerallydevelopedworldwidebecauseitissanitary,economic,convenientandwideuse.Thennaturegaslonghaulpipeline,citydistributionsystemisemergingasthetimesrequire.Citydistributionsystemisbeginfromdistributionsubstation,naturegasflowsthroughdustexhauster,dumpvalve,flowmeterodorizerandthenthroughalllevelsofdistributionnetworkdirectlytotheconsumeraccordingtotherequirement.Thepaperfinishedthesubstationtechnologicaldesignbysitearrangement,flowchartandbasedontheequipmentcalculateandselection.Theflowchartaregivenasfollowslowandmediumpressurenaturegasrespectivelyflowsthroughthepressurecontrolvalvetothe1gatheringpipe,thentothe2gatheringpipeafterpressurecontrolling,gasflowingoutofthe2dividesintothreeparts,twoofthemflowtowardsconsumersaftermeasuringoneflowstothe3gatheringpipeafterpressurecontrolling.Gasoutofthe3dividesintofourparts,andflowsthroughtheflowmeterstowardsconsumers.Theaspectofapparatusselection,thefollowingshouldbecalculatedandthenselectedpipeline,gatheringpipe,valvee.g.brakevalve,pressurecontrolvalve,andreliefvalve,extractor,flowmetertheodorizer,applianceaspressuregauge,temperaturegaugeshouldbecomparedandselected.KeywordNaturegasDistributionsubstationTechnologicfacilityTechnologicapparatus目录1绪论.....................................................................................................11.1设计目的及意义............................................................................11.2国内外现状及发展趋势.................................................................12设计说明书..........................................................................................32.1设计已知参数及设计内容.............................................................32.1.1配气站已知参数..................................................................32.1.2设计依据及内容..................................................................32.2可行性分析...................................................................................32.3设计参数及设计原则....................................................................32.4设计遵循的主要标准和规范.........................................................42.5技术路线难点及关键点.................................................................42.5.1难点.....................................................................................42.5.2关键点.................................................................................42.6配气站工艺要求............................................................................52.6.1站址选择.............................................................................52.6.2站址安全距离要求..............................................................52.6.3配气站仪表、设备设置要求...............................................52.6.4配气站安全..........................................................................62.7配气站主要工艺设备的设计和安装..............................................82.7.1管线.....................................................................................82.7.2汇管.....................................................................................92.7.3阀门....................................................................................102.7.4安全阀................................................................................102.7.5调压阀................................................................................122.7.6流量计................................................................................142.7.7分离器................................................................................142.7.8添味装置............................................................................152.7.9绝缘法兰............................................................................152.8仪表..............................................................................................162.8.1压力表仪表.........................................................................162.8.2压力报警仪表.....................................................................172.8.3温度测量仪表.....................................................................172.9吹扫与试压..................................................................................182.10工艺流程概述.............................................................................183设计计算书.........................................................................................193.1设计参数......................................................................................193.1.1已知参数的单位换算及相关假设.......................................193.1.2压缩系数的计算.................................................................193.2管道设计......................................................................................203.2.1确定管径............................................................................203.2.2确定各段管道壁厚.............................................................213.3汇管设计......................................................................................233.3.1确定汇管内径.....................................................................233.3.2确定汇管壁厚.....................................................................243.4分离器的计算...............................................................................253.4.1操作状态下的天然气体积流量...........................................253.4.2操作条件下的天然气的密度..............................................253.4.3确定颗粒沉降速度.............................................................263.4.4雷诺数的计算.....................................................................263.4.5确定卧式分离器的直径......................................................273.4.6确定分离器的壁厚.............................................................273.5流量计的计算...............................................................................283.5.1流量计选择步骤如下..........................................................283.5.2主要参数的确定.................................................................283.6阀门的计算..................................................................................323.6.1调压阀的计算.....................................................................323.6.2安全阀的计算.....................................................................354结论及建议.........................................................................................40致谢........................................................................................................41参考文献................................................................................................42附录........................................................................................................43

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