螺旋缠绕管式换热器传热性能优化与计算程序开发

Optimization of heat transfer performance and computational program development of spiral

摘要:

螺旋缠绕管式换热器作为新型换热设备，与传统换热器相比，更为紧凑的管排列方式，增大了设备单位体积内的传热面积，且流体流动过程更易多流股化，从而提升传热综合效率；对设备的传热特性进行研究并与计算机技术相结合实现性能优化与计算方法改善，对于实际设备设计生产与使用具有重要意义；通过计算流体力学（CFD）方式，对螺旋缠绕管式换热器进行简化计算模型结构工作并开展数值模拟，研究不同管排列方式，相邻管层间距，壳程流速，换热管使用材料在设备换热性能方面的影响情况，得到设备优化结构，实现设备性能提升；选定管内径，管缠绕圈数，壳程流速以及管缠绕半径四个因素及其相对应水平参数开展正交试验，并分析单因素对于绕管式换热器综合传热性能PEC的影响情况及各因素的主次程度；运用Visual Basic语言进行计算程序开发，通过对流体物性参数，管内径，管缠绕圈数，管程数等进行输入并自动计算，实现压降，传热系数，综合性能指数等结果的可视化，提高后期设计工艺计算精度。

Abstract:

As a new type of heat exchange equipment, the spiral wound tube heat exchanger has a more compact tube arrangement compared with traditional heat exchangers, which enables the equipment to have high heat transfer efficiency, large heat transfer area per unit volume, and easy multi-streaming, etc. It is of great significance for the design, production and use of actual equipment to study the heat transfer characteristics of equipment and combine it with computer technology to achieve performance optimization and calculation method improvement. In this paper, the computational fluid dynamics method(CFD) is used to numerically simulate the spiral wound tube heat exchanger, and the effects of different tube arrangements, adjacent tube layer spacing, shell side velocity, and heat exchange tube materials on the heat transfer performance of the equipment are studied and selected the four factors of inner diameter of tube, number of coils of tube winding, shell side velocity and tube winding radius and their corresponding levels were selected to carry out orthogonal test to analyze the influence of single factor on comprehensive heat transfer performance and its primary and secondary degree. Using Visual Basic language to develop the calculation program, through the fluid physical parameters, tube diameter, tube winding number, pipe number and other input and automatic calculation, to achieve the visualization of pressure drop, heat transfer coefficient, comprehensive performance index and other results, improve the calculation accuracy of the later design process.