2018傳熱傳質(zhì)學年會集

2．重慶大學工程熱物理研究所，重慶400030) Email:熱器余熱回收率從74.6%進一步提高至91.54%。1所示。該試驗平臺主要由中低溫煙2-3-4-5-6-7-L=700mm1所示，三維肋管結構如圖2所示。23個(a)肋結構示意圖 (b)三維肋管實物圖圖2三維肋管及其肋結構S1=72 (a)三維肋管換熱器結構示意圖 (b)三維肋管換熱器現(xiàn)場實物圖圖3三維肋管換熱器結構和和現(xiàn)場實物圖Qgmgcpgtg,otg,iQamacpata,ota,i

gaio為出口。

K

tg,ita,otg,ota,iT tg,ota,i Re

=vaa(ca,ota,oca,ita,i)vgg(cg,itg,ic xx x UYY

式中，Y為因變量，△Y為因變量的誤差；x為自變量，△x為自變量的誤差。根據(jù)公式4.6%。圖4所示。K擬合曲線K擬合曲線KK/(W/m230003500400045005000550060006500700075008000維肋管換熱器的總傳熱系數(shù)約由8%增大至16%。30003500400045005000550060006500700075008000350℃、Re35008000時，三維肋管換熱器的壓降增大約在不同煙氣溫度條件下(210℃350℃)400Nm3/h，改變冷分別如圖6和圖7所示。2K2K/(W/m 提高至23%。降提高約40%~58%。余熱回收率余熱回收率余熱回收率余熱回收率0

為了進一步探究三維肋管換熱器的余熱回收性能，在煙氣流量為500Nm3/h、換熱器煙氣溫度為540℃的條件下，獲得了三維肋管換熱器在不同空氣流量下的余熱回收性能，結果如圖9所示。從圖上可知，隨著空氣流量的增加，三維肋管換熱器的余熱回收余熱回收率余熱回收率

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