2025/6/2118.2Economizers
§8-2省煤器Economizersarefeed-waterheatersinwhichtheheatfromwastegasesisrecoveredtoraisethetemperatureoffeed-watersuppliedtotheboiler.Theyofferthefollowingadvantages:FueleconomyLongerlifeoftheboilerIncreaseinsteamingcapacityFinnedTubeEconomizers鳍片管省煤器C.I.GilledTubeEconomizers肋片管省煤器PlainTubeCoilEconomizers光片管省煤器
2025/6/2128.2Economizers
§8-2省煤器1.FunctionofEconomizer省煤器的作用Thetermeconomizercomesfromearlyuseofheatexchangerstoreduceoperatingcostsoreconomizeonfuelbyrecoveringextraenergyfromthefluegas. 利用换热器可以节省燃料，降低运行费用，故称为省煤器Economizeralsoreducethepotentialofthermalshockandstrongwatertemperaturefluctuationsasthefeedwaterentersthedrumorwaterwalls.当给水进入锅筒和水冷壁时，降低热冲击的潜力和强烈的水温波动。Savingfuel节省燃料Improvingtheworkingconditionofstreamdrum改善汽包工作条件Reducethecapitalcostsofboiler降低锅炉造价
2025/6/2138.2Economizers
§8-2省煤器西交大省煤器动画
2025/6/2148.2Economizers
§8-2省煤器2.Economizertypes省煤器的种类Classifiedbymaterials按材料分类Castiron铸铁:只用于工作压力低于4MPa的锅炉中，强度低不能承受高压，耐磨耐腐蚀性好，通常用在小容量锅炉上。Steeltube钢管：强度高，能承受冲击，工作可靠，传热性能好，重量轻，体积小，价格低，耐磨耐腐蚀性较差.Classifiedbyoutletwatertemperature按给水温Steamingtype沸腾式:汽化水量占总给水量10~15%,中压锅炉由于水的汽化潜热较大，为减少蒸发受热面的吸热量，防止炉内温度过低影响燃烧的稳定性，常采用。Non-steamingtype非沸腾式:一般低于饱和点20~25oC，随着压力的提高，水的气化潜热减少，液相加热到饱和温度所需预热热增大，将水的部分加热过程转移到炉内进行，以防止炉膛出口烟温过高。
2025/6/2158.2Economizers
§8-2省煤器3.Economizersurfacetypes省煤器的表面型式Baretube光管省煤器ThemostcommonandreliableeconomizerdesignIn-line(顺列),crossflow(横向流动)Staggered(错列)，crossflows2s1SidespacingBackspacingFluegass2s1S1/d=2~2.5S2/d=1~1.5S1/d=2~2.5S2/d=2
2025/6/2168.2Economizers
§8-2省煤器
2025/6/2178.2Economizers
§8-2省煤器Extendedsurfaces扩展表面（pp.194图8-3）Toreducecapitalcosts,mostboilermanufacturershavebuilteconomizerswithvarietyoffin(鳍片)typestoenhancethecontrollinggas-sideheattransferrate.Finsareinexpensivepartswhichcanreducetheoverallsizeandcostofaneco