Tube bundle replacement for segmental and helical shell and tube heat exchangers: Performance comparison and fouling investigation on the shell side
Tube bundle replacement for segmental and helical shell and tube heat exchangers: Performance comparison and fouling investigation on the shell side
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DOI：
10.1016/j.applthermaleng.2012.10.025
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发表时间：
2013-03
影响因子：
6.4
通讯作者：
Sirous Zeyninejad Movassag;F. Taher;K. Razmi;R. Azar
中科院分区：
文献类型：
--
作者：
Sirous Zeyninejad Movassag;F. Taher;K. Razmi;R. Azar
管壳式换热器中的传统分段折流板虽然具有良好的验收记录和功能性，但也存在一些局限性和缺点。特别是，壳侧流路是浪费的，导致过多的压力损失，同时回收的传热较少。这种特殊的挡板布置也限制了最大热效率，并导致出现结垢的死区。本文介绍了在大不里士石油公司用螺旋换热器替换节段式壳管式换热器的管束的结果。该项目的目的是减少关键热交换器的污垢和压降；从而降低运营和维护成本。本论文分为三个阶段。首先，讨论工业领域中管束的替代以及螺旋折流板相对于传统分段折流板的优势。然后，由于生产线中热交换器的入口受到限制，两种情况下的壳程流动行为将通过 CFD 方法进行比较。最后，将引入计算代码来研究分段式和螺旋式壳管式换热器的传热和压降。
Conventional segmental baffles in shell and tube heat exchangers, while having an excellent record of acceptance and functionality, represent some limitations and shortcomings. In particular, shell-side flow path is wasteful which causes excessive pressure loss while recovering less heat transfer. This particular arrangement of baffles also limits maximum thermal effectiveness and encourages dead zones where fouling occurs. This paper describes the results of tube bundle replacement of a segmental shell and tube heat exchanger with a helical heat exchanger, which was conducted in Tabriz Petroleum Company. The aim of the project was to reduce fouling and pressure drop of the critical heat exchanger and; as a result, reduce operation and maintenance costs. Present paper consists of 3 phases. First, tube bundle replacement in industrial field and also the advantages of helical baffles over conventional segmental baffles are going to be discussed. Then, due to limits on the access to the heat exchangers in production lines, comparison of shell-side flow behavior in both cases is going to be presented by CFD means. Finally, computational code is going to be introduced to investigate on heat transfer and pressure drop for both segmental and helical shell and tube heat exchangers.