南师大锅炉原理课件7-4 蒸汽温度调节.pptx

2025/6/2111.EffectsofoperatingvariableonST汽温影响因素(pp.19-13)Boilerload锅炉负荷:负荷增加，汽温上升Excessair过量空气系数：α增加，对流传热加强，Ts上升Feedwatertemperature给水温度降低，燃料量增加，燃烧常务的容积增加，出口烟温升高，汽温上升HeatingsurfacesCleanlinessof受热面的污染情况炉膛受热面结渣或积灰，炉内辐射传热量减少，过热器区域烟气温度升高，汽温升高过热器本身结渣或积灰，导致汽温下降UseofSaturatedsteam饱和蒸汽用汽量BurnerOperation燃烧器的运行方式,火焰中心提高,Ts上升Fueltypeandcomposition燃料种类和成分,煤粉变粗，水份增大或灰分增加，过热汽温提高。7.4Steamtemperatureadjustmentandcontrol

§7-4蒸汽温度调节

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§7-4蒸汽温度调节steamtemperaturecharacteristics汽温特性过热器或再热器出口汽温与锅炉负荷之间的关系(Fig.19-12)Convectionsuperheater对流式过热器Atmaximumload,or100%steamoutput,thegasweightishighest;heattransferisalsohigh.Thehigherheatabsorptionresultsinhighersteamtemperatureleavingthesuperheaterandahigherboileroutput. 随着负荷的增加，汽温增加。Radiantsuperheater辐射式过热器Thesteamtemperatureleavingtheradiantsuperheaterislowestathigherloadsfortworeasons.RadiantabsorptiondoesnotincreaseasrapidlyasboileroutputAthigherloadsthereismoresteamtocooltheeffectsoftheradiantabsorption. 随着负荷的增加，汽温降低。

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§7-4蒸汽温度调节

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§7-4蒸汽温度调节2.SteamtemperatureAdjustment蒸汽温度调节Permitsatoleranceof-10~+5oCinaspecificsteamoutlettemperatureduringoperation 运行中汽温允许波动值范围：-10~+5oCBasicrequirementsforadjustivedevice对调节设备的要求Simplystructure,reliablyoperation 设备结构简单，运行可靠Sensitive,littledeviationofsteamtemperature,easilyautomatic调节灵敏，汽温偏差小，易实现自动化Havenobadeffectsonboilerandsystemefficiency 不影响锅炉或热力系统的效率keepthestablesteamtemperatureattherangeofload. 在一定的负荷范围内(60~100%)保持额定的蒸汽温度

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§7-4蒸汽温度调节2.SteamtemperatureAdjustment蒸汽温度调节Adjustivemethods调节方法STadjustmentonsteamside蒸汽侧调节汽温Surfaceattemperator表面式减温器Steam-steamexchanger汽-汽交换器Sprayattemperator喷水减温STadjustmentonflu