2025/6/211Economizersandairheatersperformakeyfunctioninprovidinghighoverallboilerthermalefficiencybyrecoveringthelowlevel(lowtemperature)energyfromthefluegasbeforeitisexhaustedtotheatmosphere.省煤器和空气预热器在现代高效率锅炉系统中扮演重要的作用。Economizersandairheaterslocateatthebackpassinboiler,socalledbackpassheatingsurfacesorlowtemperatureheatingsurfaces.省煤器和空气预热器布置在锅炉系统的尾部，被称为尾部受热面或低温受热面。Inlettemperature600oC,outlettemperature140~170oC8.1Arrangementofbackpassheatingsurfaces
§8-1尾部受热面布置
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§8-1尾部受热面布置1.Functionofbackheatingsurface尾部受热面作用Foreach40F(22C)thatthefluegasiscooledbyaneconomizerorairheaterinaconventionalboiler,theoverallboilerefficiencyincreasesbyapproximately1%.Economizersrecovertheenergybyheatingtheboilerfeedwater;Airheatersheatthecombustionair.Airheatingalsoenhancesthecombustionofmanyfuelsandiscriticalforpulverizedcoalfiringtodrythefuelandensurestableignition.
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§8-1尾部受热面布置2.Arrangementofbackheatingsurface尾部受热面的布置Fig.2Economizerandairheaterlocationsinatipicalcoal-firedboiler燃煤锅炉典型的省煤器和空气预热器布置烟气每降低1oC，空气大约升温1.4oC空气预热器出口温差Δt≥30~40oC。
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§8-1尾部受热面布置2.Arrangementofbackheatingsurface尾部受热面的布置图8-17Arrangementofbackheatingsurface尾部受热面的布置Single-stageDouble-stage
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§8-1尾部受热面布置2.Arrangementofbackheatingsurface尾部受热面的布置图8-18Arrangementofbackheatingsurface尾部受热面的布置
2025/6/2168.1Arrangementofbackpassheatingsurfaces
§8-1尾部受热面布置
2025/6/2178.1Arrangementofbackpassheatingsurfaces
§8-1尾部受热面布置2.Arrangementofbackheatingsurface尾部受热面的布置图9-2Arrangementofbackheatingsurface尾部受热面的布置双级布置单级布置Question:为什么有不同的布置方式，适用条件是什么？
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