【作者】 杨德才；

【导师】 何树植； 汪传生；

【作者基本信息】 青岛科技大学 ， 机械制造及其自动化， 2007， 硕士

【摘要】 本文对轮胎氮气硫化尾气(水蒸汽质量百分含量：10％～30％)在垂直列管内对流冷凝换热的机理进行了理论分析与实验研究。利用实验得到的关联准则式，建立了氮气回收冷却冷凝器的数学描述，编写了氮气回收冷却冷凝器的设计计算软件，并提出了一种氮气回收冷却冷凝器设计的新思路。首先，本文分析了含不凝性气体的混合气体在垂直管内对流冷凝换热的特点，对混合气体的对流传热与传质进行了理论分析。运用修正的膜模型理论和Nusselt凝结理论，考虑气、液膜的特点，建立了各自的数学描述，并提出了理论求解方法。其次，对轮胎氮气硫化尾气在垂直列管内的对流冷凝换热进行了不同工况的实验研究。通过对实验数据的处理，得到了雷诺数在2500～12000范围，混合蒸汽(水蒸汽质量百分含量：10％～30％)在垂直列管内对流换热的关联准则式，并从理论和工程应用方面分析了影响尾气对流冷凝换热的因素。在此基础上，对氮气回收冷却冷凝器进行了计算机模拟及分析。建立了氮气回收冷却冷凝器的数学描述，编写了《DHS氮气回收冷却冷凝器设计》软件，并利用软件分析了氮气回收冷却冷凝器的换热特点，提出了行之有效的强化传热措施。最后提出了一种氮气回收冷却冷凝器设计的新思路。更多还原

【Abstract】 Preceded from the consideration of theoretical request and engineering application,convection-condensation heat transfer of vapor mixed with incoagulable gas in verticaltubes was studied theoretically and experimentally in this paper. Vapor mass fraction inthe gas was about 10%～30%.Firstly, heat transfer characteristics of gas mixture in vertical tubes were introducedand heat and mass transfer of mixture gas were analyzed theoretically. Considered thecharacteristics of liquid film and gas film respectively, their mathematical descriptionsand solution to these equations were established through modified film model andNusselt theory.Secondly, heat transfer of vapor mixed with nitrogen in vertical tubes wasinvestigated under the different situations. Through processing experimental data,convective heat transfer correlations were presented as Nusselt number versus Reynoldsnumber, ranging from 2500-12000. Factors influenting the heat transfer were discussedthrough the theory and engineering application.On this basis, the mathematical descriptions of nitrogen-reclaiming coolingcondenser was buit."DHS cooling condenser" software was designed. Heat transfercharacteristics of nitrogen-reclaiming cooling condenser was analysed by the software.Effective measures of enhanced heat transfer were suggested.At last, a new type of cooling condenser used in nitrogen reclaiming was proposed.更多还原