作　　者： ; ;

机构地区： 浙江大学化学工程与生物工程学系

出　　处： 《化学反应工程与工艺》 1997年第4期358-363,共6页

摘　　要： 基于两相理论建立了加压流态化床中垂直埋管与床层之间的传热模型，研究表明ｈ＝（１－δｗ）（２ｋ０ｅｗｄｐ＋αｗＣｐｇρｇＵ０）模型能较好地模拟实验值。并得到如下结论：气速对传热系数影响不明显，而随着压力的提高，传热系数明显增大，大约为每加０．５ＭＰａ传热系数增加２０Ｗ／ｍ２℃，从常压下２００Ｗ／ｍ２℃，增加到２．０ＭＰａ下３２０Ｗ／ｍ２℃。 A model of vertical tube bed heat transfer under pressure presented on the basis of the theory of two phase flow. After a number of simplificatations, a formula is obtained in the following form: h=(1-δ w )2k 0 ew d p +α w (c pg ρ g U 0) Experimental results showed that only small discrepancies were found between the values calculated by the model and experimental value. The operating velocity has little effect while pressure has great effect on heat transfer, When the pressure increases from 0.1 to 2.0 Mpa, the heat transfer coefficient increases from 220 w/m 2 ℃ to 320 w/m 2℃. The experiments showed that the transport phenomena for atmospheric and pressured fluidized beds are different.

关 键 词： 加压流态化 传热模型 流化床反应器 聚乙烯

领　　域： [化学工程]