超低排放机组烟气换热器搪瓷换热管应用

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1、第46卷第9期热力发电Vol.46No.92017年9月THERMALPOWERGENERATIONSep.2017超低排放机组烟气换热器搪瓷换热管应用12张全斌，杨建国（1.浙江省能源集团有限公司，浙江杭州310007；2.浙江大学能源清洁利用国家重点实验室，浙江杭州310027）［摘要］水媒管式烟气换热器（MGGH）是锅炉烟气超低排放处理系统的重要组成部分，其运行环境恶劣，换热管腐蚀机理复杂，解决换热管低温腐蚀是一项关键难题。通过换热管腐蚀机理分析，表明MGGH烟气再热器低温段处于第Ⅱ腐蚀严重区。对比提出2种控制低温腐蚀速率工程技术手段，满足要求的换热管材质为31

2、6L、DIN1.4529、包塑管和搪瓷管，通过研究、比选，发现选用搪瓷换热管可满足工程要求。从耐硫酸腐蚀能力、热传导性能、材料机械性能、防冲刷抗磨损能力以及工程造价等方面论证，搪瓷换热管有优异的耐低温腐蚀、抗磨损和热传导性能，且传热效果优于钢管，能很好地解决换热管低温腐蚀问题，具有重要的工程推广价值。［关键词］搪瓷；换热管；低温腐蚀；烟气换热器；超低排放；酸露点；防腐［中图分类号］TK224.9［文献标识码］B［文章编号］1002-3364(2017)09-0130-05［DOI编号］10.3969/j.issn.1002-3364.2017.09.130Applic

3、ationstudyonenamelheatexchangetubeinGGHofcoal-firedunitswithultra-lowfluegasemissionZHANGQuanbin1,YANGJianguo2(1.ZhejiangProvincialEnergyGroupCompanyLtd.,Hangzhou310007,China;2.StateKeyLaboratoryofCleanEnergyUtilization,ZhejiangUniversity,Hangzhou310027,China)Abstract:Thewatermediumheat

4、pipegas-gasheater(MGGH)isanimportantpartofultra-lowfluegasemissiontechnologyforcoal-firedboilers,ofwhichtheoperatingenvironmentisbadandthecorrosionmechanismoftheheatexchangetubeiscomplex,itisakeyproblemtosolvethelowtemperaturecorrosionofheatexchangetube.Analysisoncorrosivemechanismofthe

5、heatexchangetubeshowsthatthelowtemperaturesectionofthegasreheaterintheMGGHislocatedontheNo.IIseriouscorrosionzone.Therearetwoengineeringtechniquestocontrolthelowtemperaturecorrosionrateandtheheatexchangertubematerialsof316L,DIN1.4529,plasticandenamelcansatisfytherequirement.Itfindsthatt

6、heenamelheatexchangetubecanmeettheengineeringrequirementsthroughtheresearchandcomparison.Fromseveralaspectssuchasthecorrosionresistanceofsulfuricacid,thermalconductivity,mechanicalpropertiesofmaterials,antierosion&abrasionresistanceandengineeringcost,theenamelheatexchangetubecansolvethe

7、problemoflowtemperaturecorrosion.Enamelheatexchangetubehasexcellentperformanceoflowtemperaturecorrosionresistance,wearresistanceandheatconduction,andthecapabilityofheattransferissuperiortothesteelpipe.Ithasbeenverifiedthattheenamelheatexchangetubecansatisfythetechnicalrequireme