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时间:2019-05-31
《中空纤维膜法回收火电厂烟气中水蒸气_陈海平》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第46卷第1期热力发电Vol.46No.12017年1月THERMALPOWERGENERATIONJan.2017中空纤维膜法回收火电厂烟气中水蒸气陈海平,刘彦达,周亚男(华北电力大学国家火力发电工程技术研究中心,北京102206)[摘要]火电厂排烟中水蒸气体积分数巨大,如能部分回收利用,效益可观。本文制备了PES-SPEEK56中空纤维膜,并研究了其在不同烟气温度、烟气流速、水蒸气活度下的烟气水分回收性能。结果表明:渗透系数比渗透通量更能确切反映
2、水蒸气的实际渗透性能;烟气温度在54~70℃时,随着烟气温度升高,渗透系数也不断增加,达到70℃以后,渗透系数基本不再变化;烟气流速(0.1~0.6m/s)的增加有利于提高渗透系数,但会降低水蒸气回收率;水蒸气活度(0.33~1.00)的增加会导致水蒸气的渗透系数和回收率均降低。在某600MW机组上的实际计算表明,采用该方法回收烟气中的水蒸气成本投入低、水分回收量大,同时可有效缓解烟囱腐蚀问题,有较好的应用前景。[关键词]中空纤维膜;PES-SPEEK56;烟气水分回收;烟囱腐蚀;渗透通量;渗透系数;回收率;酸露点[中图分类号]TQ340.68[文
3、献标识码]A[文章编号]1002-3364(2017)01-0100-06[DOI编号]10.3969/j.issn.1002-3364.2017.01.100ExperimentalstudyonrecyclingwatervaporfromfluegasofthermalpowerplantsusinghollowfibermembraneCHENHaiping,LIUYanda,ZHOUYanan(NationalThermalPowerEngineering&TechnologyResearchCenter,NorthChinaElectr
4、icPowerUniversity,Beijing102206,China)Abstract:Thewatervaporcontentintheexhaustofthermalpowerplantsishuge,usingmembranetore-coverthewatervaporfromfluegasmaybeanewwaytosavewaterforthermalpowerplants,becauseithasseveraladvantages,suchassimplesystem,highqualityofrecycledwater,gre
5、atseparationfactor,abletobestandardizedmanufacturedandmodularizedinstallation.ThispaperpreparedakindofhollowfibermembranenamedPES-SPEEK56,andstudieditsperformanceofwaterrecoveryunderconditionswithdif-ferentfluegastemperatures,velocitiesandwatervaporactivities.Theresultsshowtha
6、t,thepermeabilitycoefficientperformedbetterthanthepermeabilityfluxwhenevaluatingthemembraneperformance.Thepermeabilitycoefficientincreasedwiththefluegastemperaturerangingfrom54℃to70℃,butitchangedlittlewhenthefluegastemperatureincreasedtoabove70℃.Anincreaseinfluegasvelocity(0.1
7、m/sto0.6m/s)wasbeneficialtotheincreaseofthepermeabilitycoefficient,butwouldreducetherecoveryrate.Theincreaseofthewatervaporactivitydecreasedboththepermeabilitycoefficientandtherecoveryrate.Calculationfora600MWunitindicatesthat,usingthismethodtorecyclethewatervaporformthefluega
8、shasalowinvestmentcostandlargerecoveryrate,andcaneffectivelya
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