板式换热器的结构设计与计算.docx

摘  要 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紧凑 换热器。各相邻板片之间形成薄矩形通道，通过板片进行热量交换。板式换热器的传热 性能与板面的波纹形状、尺寸及流程组合方式都有密切关系。它与常规的管壳式换热器 相比，在相同的流动阻力和泵功率消耗情况下，其传热系数高，结构紧凑，占地面积小， 价格低，安装方便，易清洗，在适用的范围内有取代管壳式换热器的趋势。板式换热器 应用很广，尤其是更适宜用于医药、食品、制酒、化工等工业，并且随着板型、结构上 改进，正在进一步扩大它的应用领域。 本文对板式换热器的发展及应用领域作了简要的介绍，通过板式换热器的传热原 理，进行板式换热器热力计算和阻力计算，在满足了校核条件下，设计出板片波纹形式 为双人字形、板片数为 149 片的并联流程组合的可拆卸式板式换热器。在此基础上，用 AutoCAD 绘制板式换热器零件图及装配图。设计的换热器工艺性好，安全可靠，便于 操作、安装，成本低。 关键词： 板式换热器；结构设计；传热计算；阻力计算 Ⅰ Abstract Plate heat exchanger is a new compact and efficient heat exchanger, consists of a series of corrugated sheet metal with a certain shape made of stacked. Formed thin rectangular channels between adjacent plates, through plates exchange heat. Plate heat exchanger heat transfer performance are closely related with plate’s corrugated shape, size and process combinations. Compared with the conventional shell and tube heat exchanger, at the same flow resistance and pump power consumption, it has the advantages of high heat transfer coefficient, compact, small footprint, low price, easy to install and clean. It has the trends replace shell and tube heat exchanger within applicable range. Plate heat exchanger applications is very broad, especially more suitable for medicine, food, wine, chemical and other industries. With the improvement of plate’s shape and structural, its field of application is further expanding. In this paper, the development and applications of plate heat exchanger was made a brief introduction.Through the principles of heat transfer of the plate heat exchanger, performed thermal and resistance calculations, under meeting the checking conditions, designs detachable plate heat exchanger, that plate’s corrugated shape is double herringbone, plate number is 149, process composition is parallel. On this basis, using AutoCAD to draw plate heat exchanger parts and assembly drawings. Designed heat exchanger technology is good, safe, reliable, easy to operate, install, and low cost. Keywords: plate heat e