Natural draft dry cooling tower is attractive in recent decades with its superiority of zero water loss. Some old thermal power plants are under high pressure of waste water reducing emission, thus the natural draft wet cooling tower is obsoleted. Reconstructing natural draft wet cooling tower into natural draft dry cooling tower is attractive for the saving of capital expenditure. But it has not been researched before, this study aims to fill this gap. Based on an actual reconstruction case, the operation mode of reconstructed dry cooling system is established and relevant MATLAB programming is realized, which was validated by literature data. The reconstructed system consists of two reconstructed natural draft dry cooling towers, a usual natural draft dry cooling tower and two 660 MW power units. The cooling capacity of reconstructed natural draft dry cooling tower is lower through thermal characteristic comparison with the usual natural draft dry cooling tower. In order to realize the optimal operation, different water distribution schemes are presented and several operation parameters are analyzed. Under the optimized reconstruction design, the annual water saving and annual cost are discussed. The annual water saving is about14.49 million metric tons that is about 8.86 million dollars and the minimum annual cost is about 181.47 million dollars, which brings great economic and environmental benefits.

天然通风的干式冷却塔在近几十年来以其零失水的优势而吸引人。一些老火力发电厂处于废水高压下，减少了排放，因此自然通风湿式冷却塔被淘汰了。将自然通风的湿式冷却塔改造成自然通风的干式冷却塔对于节省资本支出很有吸引力。但是之前尚未进行过研究，本研究旨在填补这一空白。基于实际的改造案例，建立了改造后的干式冷却系统的运行模式，并实现了相关的MATLAB编程，并通过文献数据进行了验证。改造后的系统包括两个改造后的自然通风干式冷却塔，一个通常的自然通风干式冷却塔和两个660兆瓦的发电装置。与常规的自然风干式冷却塔相比，通过热特性，重建的自然风干式冷却塔的冷却能力较低。为了实现最佳运行，提出了不同的配水方案，并对几种运行参数进行了分析。在优化的改造设计下，讨论了年度节水和年度成本。年节水约1449万吨，约886万美元，最低年成本约18147万美元，带来了巨大的经济和环境效益。提出了不同的配水方案，并分析了几个运行参数。在优化的改造设计下，讨论了年度节水和年度成本。年节水约1449万吨，约886万美元，最低年成本约18147万美元，带来了巨大的经济和环境效益。提出了不同的配水方案，并分析了几个运行参数。在优化的改造设计下，讨论了年度节水和年度成本。年节水约1449万吨，约886万美元，最低年成本约18147万美元，带来了巨大的经济和环境效益。