板式换热器是由一系列具有一定波纹形状的金属片叠装而成的一种新型高效换热器，各种板片之间形成薄矩形通道，通过板片进行热量交换。板式换热器是液-液液-汽进行热交换的理想设备。它具有传热效率高、结构紧凑、占地面积小、操作灵活、应用范围广、热损失小、安装拆卸方便、使用寿命长等特点。在相同压力降的情况下，其传热系数是列管换热器的3-5 倍.占地面积为列管换热器的1/3，金属消耗量只有列管换热器的2/3，两种介质的传热平均温差可以小至1℃，热回收效率可达90%以上，因此板式换热器是一种高效、节能、节约材料、节约投资的先进热交换设备。

Plate heat exchanger is a kind of new and high effect heat exchanger which is consist of a series of metal plates with some corrugated form and there is a rectangular channel between plates and the medis exchange heat through plates.Plate heat exchanger is the perfect equipment of heat exchange for fluid-fluld and fluld-gas. lts advantages are high heat transfer efficiency. compact structure, small occupied area, easy opera- tion, wide range of application, little thermal losses, easy installation and removal and long service ife. In the case of same pressure drop, its heat

transfer coeffcient is 3-5 times than shel-and-tube heat exchanger, its occupled area is one third of shell-and-tube heat exchanger, its meta wastage is just two thirds of shell-and-tube heat exchanger,the mean temperature difference of the two media can be 1C,and the heat recovery effcency can be over 90%.Therefore,plate heat exchanger is an advanced heat exchange equipment with high effciency, energy conservation, economy of materials and investment save