基于强化传热的火电机组节水与安全运行研究
发布时间：2018-11-02 14:53
【摘要】：根据低温多效蒸馏海水淡化系统的工况范围及对传热和流动的要求,并结合板式蒸发器紧凑、高效的特点,本文提出了在低温多效蒸馏海水淡化系统中采用板式蒸发器替代传统管壳式蒸发器的设想。以窄通道的人字形板式蒸发器和宽通道的LT型板式蒸发器为实验元件,设计并搭建了强化传热实验台。针对蒸发和凝结两种不同的换热方式,进行了传热性能和流动性能的实验研究。实验得到了在不同蒸汽流量下,水蒸气在两种换热器中的凝结换热系数、蒸发换热系数和流动阻力,并拟合成Nu以及f随Re变化的无因次关联式。通过实验获得的数据,对两种板片的换热能力进行对比分析。研究结果为板式蒸发器应用在海水淡化水电联产系统提供参考。 本文最后以蛇形翅片扁平管为研究对象,以预测管内凝结水冻结规律为目的,搭建了风洞实验台,获得管内为单相水对流换热条件下的蛇形翅片扁平管的传热性能。实验结果可以作为预测扁平管内凝结水冻结规律的依据,为火电直接空冷机组防冻措施的制定提供参考。
[Abstract]:According to the operating range of low-temperature multi-effect distillation seawater desalination system and the requirement of heat transfer and flow, combined with the compact and efficient characteristics of plate evaporator, In this paper, the idea of using plate evaporator to replace the traditional tube and shell evaporator in low temperature multieffect distillation seawater desalination system is put forward. Taking the narrow channel herringbone plate evaporator and the wide channel LT type plate evaporator as the experimental elements, a heat transfer enhancement experiment platform is designed and built. The heat transfer performance and fluidity of two different heat transfer modes, evaporation and condensation, were studied experimentally. The condensation heat transfer coefficient, evaporation heat transfer coefficient and flow resistance of water vapor in two kinds of heat exchangers are obtained under different steam flow rates, and the dimensionless correlations of Nu and f with Re are proposed. Through the experimental data, the heat transfer ability of the two kinds of plates was compared and analyzed. The results provide a reference for the application of plate evaporator in seawater desalination hydropower system. Finally, in order to predict the freezing law of condensate water in a serpentine finned flat tube, a wind tunnel experimental bench is built to obtain the heat transfer performance of a serpentine fin flat tube under the condition of single-phase water convection heat transfer. The experimental results can be used as the basis to predict the freezing law of condensate in flat pipe and provide a reference for the formulation of anti-freezing measures for direct air-cooled units of thermal power plants.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P747
本文编号：2306119
[Abstract]:According to the operating range of low-temperature multi-effect distillation seawater desalination system and the requirement of heat transfer and flow, combined with the compact and efficient characteristics of plate evaporator, In this paper, the idea of using plate evaporator to replace the traditional tube and shell evaporator in low temperature multieffect distillation seawater desalination system is put forward. Taking the narrow channel herringbone plate evaporator and the wide channel LT type plate evaporator as the experimental elements, a heat transfer enhancement experiment platform is designed and built. The heat transfer performance and fluidity of two different heat transfer modes, evaporation and condensation, were studied experimentally. The condensation heat transfer coefficient, evaporation heat transfer coefficient and flow resistance of water vapor in two kinds of heat exchangers are obtained under different steam flow rates, and the dimensionless correlations of Nu and f with Re are proposed. Through the experimental data, the heat transfer ability of the two kinds of plates was compared and analyzed. The results provide a reference for the application of plate evaporator in seawater desalination hydropower system. Finally, in order to predict the freezing law of condensate water in a serpentine finned flat tube, a wind tunnel experimental bench is built to obtain the heat transfer performance of a serpentine fin flat tube under the condition of single-phase water convection heat transfer. The experimental results can be used as the basis to predict the freezing law of condensate in flat pipe and provide a reference for the formulation of anti-freezing measures for direct air-cooled units of thermal power plants.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P747
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