LNG缠绕管式换热器试验研究中的热物性计算方法
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摘要:摘要在基本负荷型的LNG工厂中,多股流缠绕管式换热器是应用最广泛的主低温换热器,多组分介质在管程和壳程的传热与流动特性是主低温换热器试验研究的关键,而混合介质的热物性(密度、动力黏度、导热系数、比热容)对试验研究的影响较大。为此,在考虑了压力对气态混合物热..
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摘要在基本负荷型的LNG工厂中,多股流缠绕管式换热器是应用最广泛的主低温换热器,多组分介质在管程和壳程的传热与流动特性是主低温换热器试验研究的关键,而混合介质的热物性(密度、动力黏度、导热系数、比热容)对试验研究的影响较大。为此,在考虑了压力对气态混合物热物性计算影响的情况下,对气态和液态混合介质的4种基本热物性的计算方法进行了提炼、集成,并将计算结果与HYSYS的计算结果进行了比较,结果表明:相关的热物性计算方法是可行的,计算误差均控制在工程允许范围内。该计算方法为国内开发大型冷塔提供了技术支撑,有助于早日实现LNG缠绕管式换热器冷塔的国产化。A multi-stream spiral wound heat exchanger is one of the most widely used main cryogenic heat exchangers(MCHEs) in a basic-load type LNG plant.The key point of the research on MCHE is the heat transfer and flow characteristics of multi-component media in tubes and shell sides,while the thermo-physical properties of mixture media have great effect on experimental research.This paper introduces calculation methods of the thermal-physical properties of gas and liquid media,including density,dynamic viscosity,heat conductivity,and specific heat capacity.It compares the results with those computed by the HYSYS software.The result shows that the calculation error is controlled within the engineering allowance range.Hence the calculation methods introduced in the paper are feasible.It provides technical support for the development of domestic large-scale cold towers and promotes the China-made spiral wound LNG heat exchangers. 基金国家高技术研究发展计划(863计划)重点项目(编号:2009AA044802) 关键词LNG 主低温换热器 缠绕管式换热器 传热 流动特性 混合介质 热物性 计算方法LNG,main cryogenic heat exchanger(MCHE),spiral wound heat exchanger,heat transmission,flow behavior,mixture medium,thermo-physical property,calculation method |
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