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A New Energy-saving Hybrid System Consisting of Latent Thermal Energy Storage and Flash Evaporation

潜热储能与闪蒸的新型节能混合系统

基本信息

批准号：
03555200
负责人：
MIYATAKE Osamu
金额：
$ 11.46万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

An energy-saving hybrid system which consists of a latent thermal energy storage unit and a flash evaporation unit has been developed in order to generate the process steam by utilizing various sources of intermittent waste heat. We adopt form-stable polyethylene as a phase change material, and water as a heat transfer medium. The adaptation of this phase change material, which does not undergo melt flow even above the melting temperature, make it possible to perform the direct heat exchange with the heat transfer medium. The spray flash evaporation technique developed originally in our laboratory is applied to the flash evaporation unit. The heat transfer medium heated in the latent thermal energy storage unit is injected through a circular tube nozzle into the flash evaporation unit, where a portion of it flashes off as vapor.The discharge characteristics of the latent thermal energy storage unit, the evaporation efficiency of the flash evaporation unit, and the over-all thermal efficiency of the hybrid system are experimentally examined. As a result, the system is found to generate the process steam relevant to the heat quantity more than 95% of the stored thermal energy, even in the case of lower superheats, due to the high efficiency of the spray flash evaporation technique. The result suggests that out hybrid system can be applied to energy-saving systems.In addition, semi-empirical equations for predicting the time variation of the temperature and the evaporation rate of the heat transfer medium are deduced as the function of various operating parameters. These results make it possible to simulate the time variation of the amount of steam generated.

开发了一种由潜热储能单元和闪蒸单元组成的节能混合系统，以便通过利用各种间歇废热源来产生工艺蒸汽。我们采用形状稳定的聚乙烯作为相变材料，水作为传热介质。即使在熔化温度以上也不经历熔体流动的这种相变材料的适配使得可以与传热介质进行直接热交换。将本实验室自行开发的喷雾闪蒸技术应用于闪蒸装置。将在潜热储能单元中被加热的传热介质通过圆管喷嘴注入闪蒸单元中，在闪蒸单元中，传热介质的一部分作为蒸汽闪蒸掉。对潜热储能单元的放电特性、闪蒸单元的蒸发效率以及混合系统的总体热效率进行了实验研究。结果发现，由于喷雾闪蒸技术的高效率，即使在较低过热的情况下，该系统也产生与大于所存储热能的95%的热量相关的工艺蒸汽。结果表明，外混杂系统可以应用于节能系统中，并推导出了传热介质温度和蒸发速率随运行参数变化的半经验公式。这些结果使得模拟所产生的蒸汽量的时间变化成为可能。