目前,我国国家标准规定商品天然气的CoZ含量不大于3%,由于能量计量更科 学更先进,更能反映天然气的内在价值,现在世界上许多国家都已采用能量计量天然 气的计量方式考虑到未来我国天然气计量将逐步转为能量计量,管输气的C02含量 还可能进一步降低因此,所有酸性气田的天然气不仅需要脱除硫化氢,还要脱除二 氧化碳二氧化碳可应用于食品!焊接!消防!农业!油气开采!清洗!化工等许多 行业,二氧化碳市场潜力很大我国高酸性气田净化过程中脱除的C02主要是排放, 如果能将巨量的COZ资源妥善利用,不仅减少环境污染,而且可以利用碳资源为企业 增加经济效益 本文介绍了经济可行性研究相关经济理论,同时总结出CoZ的主要分离方法:化 学溶剂法!物理溶剂法!吸附法!低温分离法和膜分离法,通过对几种方法进行对 比研究,选择MEA法脱COZ作为报告经济分析的方法 从MEA法脱COZ工艺的基本原理和工艺流程出发,给出可以用于流程中主要设备 工艺计算的方法,提出适用于MEA法分离二氧化碳经济可行性研究的具体步骤,可以 为建设具体脱COZ厂的可行性研究提供技术经济理论体系通过对不同处理量,不同 二氧化碳含量原料气进行经济分析,得出建设脱C02厂项目可行与否以及评价指标随 基本参数变化的规律 报告给出的经济评价方法以及建设具体脱二氧化碳站场的经济分析结果,不仅可 以为气田用MEA法脱COZ的可行性研究作为参考,而且可以为气田建设类似天然脱 C02厂的可行性研究提供思路 关键词:天然气脱C02MEA法技术经济可行性研究ABSTRACT AtPresent,it.5stiPulatedinnationalstandardthattheeontentofearbondioxidein commoditynaturalgasshouldn.tbegreaterthan3%andmosteountriesuseenergy measurebeeauseenergymeasure15moreadvaneedandeanreflectinherentgasvaluemore. Consideringthatgasmeasuresmodeinoureountrywilltumintoenergymeasureinthe futureandtheeontentofearbondioxideingasinPIPelinesWillPossiblyredueefurther, therefore,gasinaciditygasfieldneedsnotonlytoeliminatehydrogensulfide,butalsoto eliminateearbondioxide.CarbondioxideeanbeaPPliedtomanyindustriessuehasfood, welding,fireeontrol,agrieulture,011andgasexPloit,wash,chemiealindustryand50on andmarketPotentialofearbondioxideinoureountry15verybig.HOwever,earbondioxide 15alwaysdisChargedinhighaciditygasfieldinPurifyingProeess,andifiteanbemade gooduseof,iteaneutdownenvironmentalPollutionandincreaseseeonomiceffeetof enterprise. Theoryabouteeonomyfeasibilitywasintrodueedandatthesametimethemain seParationmethodsweresummeduP:chemistrymenstruum,Physiesmenstruum, adsorPtion,lowtemPeratureseParationandfilmseParation.AndtlirougheomParisonof thesemethodsMEAmethodwasehoseasthemethodofeeonomyanalysisinthisPaPer. BasedonfundamentalPrineiPleandteehnologiealProeessofeliminatingCOZwith MEA,methodsoftechnologiealealculationofeaPitalequiPmentsinaProeessareProvided, andsPecificProceduresofeconomiefeasibilitystudysuitableforeliminatingCOZwith MEAaresuggested,whichProvideteChnologiealandeconomietheoriestosuPPort feasibilitystudyofeonstruetingarealCOZeliminatingstation.Aecordingtoeeonomie analysisofdifferentCOZtreatmenteaPaeityanddifferentfeedgas,theeonelusionof whetherornoteonstruetingaCOZeliminatingstation15reached.Meanwhile,thelawof evaluationindieationaeeordingtobasieParameterehanges15given. EconomicevaluationmethodandresultsofeconomielawineonstructingareaiCOZ eliminatingstationareProvidedinthisartiele,whiehgiveacluetoeeonomiefeasibility studyofCOZeliminatingwithMEA,andrefertofeasibilitystudyofgasfieldeonstruetion suchasnaturalgasPurifieationPlantaswell. Keywords:COZeliminationfromnaturalgas;MEAmethod:technologiealeeonomy; feasibilitystudy目录 1绪论.......,二,.,....................................................................................................1 1.1报告研究目的及意义..............................#1 1.2国内外气体脱碳技术现状........................,.........................,................1 1.3经济分析基础..........................................................................#~#3 1.3.1基础数据构成.........................................................................#3 1.3.2主要评价指标..................................................................#...4 1.4二氧化碳产品市场............................................................#5 1.4.1国外市场................................................................................#.....#.6 1.4.2国内市场..................................................................................#.....#..#7 1.5本文的研究思路和目标....,........................................................................8 1.6本文的主要工作.......................................................................8 2脱C02技术对比研究及选择.................................................................................10 2.1化学溶剂法...................................................................................#.....#...10 2.1.1醇胺法..................................................................................................10 2.1.2热钾碱法..........................................,.............................................12 2.2物理溶剂法.................................................................................................13 2.3吸附分离法.........................................................................................#........#15 2.4低温分离法..........................................................................#....16 2.5膜分离法.........................................................................................................17 2.5.1气体分离膜法....................................................................#...#.17 2.5.2气体吸收膜法.........................................................................#!#19 2.6脱c02工艺的选择....................................................#.19 2.7本章小结...........................................................................................,.-..,22 3MEA法脱C02工艺及站场费用现值研究..................................,二....23 3.IMEA脱碳工艺流程.....,..,...................................#23 3.2工艺模拟技术及醇胺平衡方程.....................................................................23 3.2.1工艺流程模拟技术...................................................#23 3.2.2醇胺平衡方程......................................................................23 3..3主要设备选型计算方法.................................................................................26 3.3.1分离设备工艺计算..............................................................................26 3.3.1.1立式分离器设计.......................................................................27 3.3.1.2卧式分离器设计.......................................................................28 3.3.2塔设备工艺计算..................................................29 3.3.2.1吸收塔设计.............................................................#..#...#29 3.3.2.2再生塔设计.................................................34 3.3.3冷换设备工艺计算...........................#35 3.3.3.1贫富液换热器设计.............................................35 3.3.3.2空冷器设计...............................................................................39 3.3.3.3再沸器设计........................................................................#...42 言3.4装置运行中可能出现的问题及解决方法.....................................................45 3.4.1设备腐蚀..............................................................................................45 3.哇.2吸收和解吸过程的发泡......................,.............,.....................45 3.4.3MEA溶剂的损失..................................................................................46 3.4.4溶液中非酸性气体的夹带..........................................;.................46 3.5费用现值研究.............................................................................................,.,.47 3.5.1总投资估算方法..................................................................................47 3.5.2总成本费用估算方法..........................................................................48 3.5.3销售收入与税金及附加估算方法......................................................48 3.6本章小结.........................................................................................................49 4MEA法脱CO:算例及经济分析研究.......................................................