2025/6/2118.3Airheaters
§8-3空气预热器1.Functionofairheaters空气预热器的作用 Airheatersareusedinmoststeamgeneratingplantstoheatthecombustionairandenhancethecombustionprocess.进一步降低排烟温度，提高锅炉效率，节省燃料；排烟温度每降低15oC，锅炉效率提高约1%。改善燃料的着火与燃烧条件，降低不完全燃烧热损失q3、q4，进一步提高锅炉效率。节约金属，降低造价。强化了炉膛内的辐射换热，减少水冷壁的用量。改善引风机的工作条件。（降低排烟温度）
2025/6/2128.3Airheaters
§8-3空气预热器2.Classificationofairheaters空气预热器的分类Recuperativeairheater传热式Inarecuperativeheatexchanger,heatistransferredcontinuouslyanddirectlythroughstationary,solidheattransfersurfaceswhichseparatethehotflowstreamfromcoldflowstream.Themostcommonheattransfersurfacesaretubesandparallelplates.热量连续不断通过传热面由烟气传递给空气，烟气和空气有各自的通路Recuperativeairheatersfunctionwithlittlecross-contamination,orleakage,betweenstreams.传热式空气预热器具有气流间污染小，漏风少的特点。Tubularairheater管式:一般采用立管式，由若干各标准尺寸的立方形管箱、连通风罩及密封装置组成Plateairheater板式
2025/6/2138.3Airheaters
§8-3空气预热器2.Classificationofairheaters空气预热器的分类Regenerativeairheater蓄热式（回转式）Regenerativeairheaterstransferheatindirectlybyconvectionasahotstoragemediumisperiodicallyexposedtohotandcoldflowstreams.Avarietyofmaterialscanbeusedasthemediumandperiodicexposuretohotandcoldflowstreamscanbeaccomplishedbyrotaryorvalveswitchingdevices.Insteamgeneratingplants,tightlypackedbundlesofcorrugatedsteelplates波纹板severasthestoragemedium.烟气和空气交替地通过受热面，烟气通过时，热量由烟气传递给受热面材料，并被蓄积起来，然后空气通过受热面，将蓄积地热量带走，受热面被周期性地加热冷却。Regenerativeairheatersarerelativelycompactandarethemostwidelyusedtypeforcombustionairpreheatinginelectricutilitysteamgeneratingplants.Themostnotableoperatingcharacteristicsisthatasmallbutsignificantamountofairleaksintothegasstreamduetotherotaryoperation.
2025/6/2148.3Airheaters
§8-3空气预热器3.Tubularairheaters一般采用立管式，由若干各标准尺寸的立方形管箱、连通风罩及密封装置组成，图8-11(Fig.13)
2025/6/2158.3Airheaters
§8-3空气预热器3.Tubularairheaters管式空气预热器Configuration结构管