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一、前言 由于板式换热器具有一系列优点,近年来我国的实践证明,采用板式换热器在节约投资和节省能耗等方面都能获得良好的经济效益。为了在适宜应用板式换热器的温度和压力范围内不断地开拓采用板式换热器的领域,迫切需要研究开发出一种流阻很低的板式换热器。例如,正在研究开发中的低温供热核子反应堆,就要求开发出一种流阻小于50毫米水柱、传热系数高于1000 W/(m~2·℃)的板式换热器。而目前国内外的板式换热器
I. Introduction Since the plate heat exchanger has a series of advantages, our country’s practice in recent years has proved that the plate heat exchanger can obtain good economic benefits in terms of saving investment and saving energy consumption. In order to apply plate heat exchanger in the temperature and pressure range to continue to explore the use of plate heat exchanger in the field, there is an urgent need to study and develop a low flow resistance plate heat exchanger. For example, researching and developing cryogenic heat nuclear reactors requires the development of a plate heat exchanger with a flow resistance of less than 50 millimeters of water and a heat transfer coefficient of more than 1000 W / (m ~ 2 · ° C). At present, the plate heat exchanger at home and abroad