气-气热管换热器的优化选型设计

热管是一种传热效率极高的新型传热元件 ,由热管组成的热管换热器具有结构紧凑、有利于控制酸露点腐蚀、工作可靠等优点。这种换热器在热能利用、废热回收等方面应用广泛。热管换热器形式多样、结构复杂 ,因而如何选择其形式是工程应用中的一个重要环节。以气 -气热管换热器中的典型代表———热管空气预热器为例 ,详细阐述了热管换热器整体优化设计及优化选型方法。以年净收益最大为目标函数 ,建立了优化设计的数学模型 ,并采用穷举法和复形调优法对热管换热器的热管基管直径、冷热流体侧翅片间距、翅片厚度、管束横向管间距及冷热流体的迎风流速进行优化。开发了热管换热器优化选型程序 ,同时通过对实例进行计算和分析 ,并与常规设计计算结果进行比较 ,最后得出结论 :通过优化设计既可节省大量的初始投资 ,又可降低运行成本 ,从而获得可靠的经济效益 ,为工程设计提供了设计思路。

The Optimal Selection Design for Gas-Gas Heat Pipe Heat Exchanger

Heat pipe is a new type component with high heat transfer efficiency. The heat pipe heat exchanger composed of heat pipes has advantages of structure compact, easy to control the erosion of acid dew point and work-reliable, therfore was used widely in heat energy utilization and waste heat recalling. Heat pipe heat exchanger has many types, it is important how to choose them in engineering application. Examplifying a the typical gas-gas heat pipe heat exchanger(heat-pipe air preheater), this paper discuss in detail methods of integrated optimal design and the optimal type selection for heat pipe heat exchangers. In order to optimize the heat pipe diameter, spacing of fin, pipeline spacing,thickness of fin, and windward velocity of flow, we take the maximal net investment income as object function and establish a mathematical model about the optimum design by adopting limit illustration method and plural adjusting optimum method. The computer program of the optimal selection for heat-pipe heat exchanger is developed. Computing and analyzing the application and comparing the optimization result with the conventional design result, show that this method may save much initial investment and obviously cut operating cost down. So we gain reliable economic benefit. The software also can be used as reference of engineering dsign and provide design philosophy for engineering design.