高-高压型螺纹锁紧环式换热器设计改进

DESIGN IMPROVEMENT OF HIGH-HIGH PRESSURE THREAD-LOCKING RING HEAT EXCHANGER

螺纹锁紧环式换热器在运行和检修中存在两个重大问题:内漏和螺纹锁紧环装拆时咬死。现有的螺纹锁紧环式换热器都不能同时避免上述两个问题。文章分两步对∅1800 mm高-高压型螺纹锁紧环式换热器进行设计改进:第一步,改进工艺,即将管、壳程介质互换使管程压力大于壳程,利用压力差进行自紧密封,主要解决内漏问题;第二步,改进结构,即采用D形螺栓代替主螺纹连接,使管箱端部质量减小约25%~30%。经过上述改进,不仅使原换热器总质量减小、成本降低,而且首次同时解决了内漏和螺纹锁紧环装拆时咬死这两个重大问题。

There are two major problems in the operation and maintenance of the thread-locking ring heat exchanger:internal leakage and seizure during the assembly and disassembly of the thread-locking ring.None of the existing thread-locking ring heat exchangers can avoid the above two problems at the same time.Design improvements were made for the∅1800 mm high-high pressure thread-locking ring heat exchanger in two steps.The first step is to improve the process,namely to exchange the medium between the tube side and shell side to make the tube side pressure greater than that of the shell side.The pressure difference was used for self-tight sealing,which mainly solved the problem of internal leakage.The second step is to use D-shaped bolts instead of the main thread connection to reduce the weight of the tube box by about 25% to 30%.After these improvements,the total weight and the cost of the original heat exchanger was reduced and the two major problems of internal leakage and seizure during assembly and disassembly of the thread-locking ring were solved.