This paper discusses the advantages and disadvantages, cooling principle and structure of packed cooling tower and hollow cooling tower and introduces the problems that our company met during the tranformation from packed cooling tower to hollow cooling tower and the transformation programme in detail.%讨论了填料塔和中空塔的优缺点、冷却原理、结构等；详细介绍了在本公司填料塔改为中空塔过程中遇到的问题和改造方案。
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