论文部分内容阅读
前言目前热交换器管板焊接,大多数采用端部焊接的型式,即把管子插入管板孔内,在管板端焊接,其典型结构如图1所示。该结构的特点是焊缝外观检查及修复比较容易。对高温高压等重要热交换器,除端部焊接之外,还要胀管。强度主要由胀接来承受,焊接是保证密封。端部焊接的热交换器有两个问题,不好解决:①由于管子和管板之间带有缝隙,此处容易积垢,形成氯离子浓缩,
Preface At present, the heat exchanger tube plate welding, most of the use of the end of the welding type, that is, the tube inserted into the tube plate hole in the tube plate end welding, the typical structure shown in Figure 1. The structure is characterized by weld appearance inspection and repair easier. On the high temperature and pressure and other important heat exchanger, in addition to the end of welding, but also expanded. Mainly by the expansion to withstand the intensity, welding is to ensure that the seal. End welded heat exchanger has two problems, not good solution: ① due to the gap between the tube and the tube plate, where it is easy to scale, the formation of chloride ion concentration,