Comprehensive performance of variable-pitch overlapped helical baffled heat exchangers

doi:10.11949/j.issn.0438-1157.20150557

Abstract

Abstract:

Variable-pitch overlapped helical baffled heat exchangers were proposed and designed to improve the influence of leakage in triangle zone on the shell-side comprehensive performance.The comprehensive performance was analyzed based on numerical simulation.The results show that the main influence factors on variable-pitch helical baffled heat exchangers are helix angle combination,numbers of helix period and physical parameter of working medium.Variable-pitch helical baffled heat exchangers could improve the triangle leakage zone to some extent.Comprehensive performance of variable-pitch helical baffled heat exchanger is better than that of constant helical baffled heat exchangers with the same helix angle.When the comprehensive performance of the two kinds of helical baffled heat exchangers are the same,variable-pitch heat exchangers could enhance the heat transfer or save material of helical baffles and installing time.

Key words: variable-pitch helical baffled heat exchanger, numerical simulation, comprehensive performance, triangle leakage zone

摘要：

为解决三角区漏流对壳程综合性能的影响,设计提出变螺距搭接螺旋折流板换热器,并进行了数值模拟和综合性能分析。结果表明,变螺距搭接螺旋折流板换热器的综合性能主要受螺旋角组合方式、螺旋周期数量和工质物性参数影响;在一定程度上能够实现优化三角漏流区的目的,某些螺旋角组合方式下的换热器综合性能明显优于相同螺旋角下的等螺距换热器;当变螺距螺旋折流板换热器与等螺距螺旋折流板换热器综合性能相同时,其还具有强化壳侧传热或节省折流板用耗材和便于安装的优点。

关键词: 变螺距螺旋折流板换热器, 数值模拟, 综合性能, 三角漏流区

CLC Number:

TK124

DU Tingting, CHE Kai, WANG Danhua, CHENG Lin. Comprehensive performance of variable-pitch overlapped helical baffled heat exchangers[J]. CIESC Journal, 2015, 66(S2): 143-152.

杜婷婷, 车凯, 王丹华, 程林. 变螺距搭接螺旋折流板换热器综合性能[J]. 化工学报, 2015, 66(S2): 143-152.

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