三聚甲醛/水换热器的数值模拟及结构改进

Study on Numerical Simulation and Structure Improvement of S-Trioxane/Water Heat Exchanger

针对某大型化工企业的三聚甲醛/水换热器在生产中发生的失效问题,借助于ANSYS FLUENT 15.0软件对换热器的流体流动以及传热进行数值模拟。通过分析管程和壳程流体的流速分布、温度分布及压力分布情况,找到产生故障的原因,提出结构改进措施,并采用数值模拟的方法,验证结构改进的合理性。研究结果表明:改变管程进口的方向和距离,调整壳程进、出口的位置,并在管程和壳程进口处加防冲档板能够使管程和壳程进、出口处的流场分布趋于均匀;降低流体对管束的冲击力,改善管束周边的应力分布状态。结构改进后可有效防止事故的发生。

In order to solve the failure problem of s-trioxane / water heat exchanger used in a large chemical industry,a numerical simulation on the fluid flow and heat transfer of the heat exchanger was established by using ANSYS FLUENT15. 0 software. By the analysis of the velocity field,temperature field and pressure field,the cause of the failure was found,and it put forward a measure to modify the structure. The improved rationality of structure was verified by the mean of numerical simulation. The research results show that the field distribution in the inlet and outlet of shell and tube tends to be uniform after the structure improved. The impact force of the fluid to the tube bundle is reduced and the stress distribution around the tube bundle is improved. The accidents could be effectively prevented after the structure improved.