連續型和鋸齒型螺旋翅片管翅片效率計算和分析

　　摘要：

　　介紹了煙氣換熱領域常用的兩類高頻焊鋼質螺旋翅片管.指出目前存在多種連續型與鋸齒型高頻焊螺旋翅片管翅片效率計算方法，不便于同類換熱實驗結果的相互比較.通過深入分析與計算比較，對連續型與鋸齒型高頻焊螺旋翅片管分別給出了建議的翅片效率計算方法，供相關的工程設計及實驗研究選用.兩種管型的翅片效率比較表明，鋸齒翅片的翅片效率較高，提高的幅度隨翅片高度增大而增大.

　　關鍵詞：

　　余熱鍋爐； 螺旋翅片管； 連續型翅片； 鋸齒型翅片； 翅片效率

　　中圖分類號：TK 223 文獻標志碼：A

　　Calculation and analysis of fin efficiency of solid and serrated helical-finned tubes

　　MA You-fu， YUAN Yi-chao

　　（School of Energy and Power Engineering， University of Shanghai for Science

　　and Technology， Shanghai ， China）

　　Abstract：

　　This paper introduced two types of helical-finned tube which are manufactured by high-frequency resistance welding and widely applied to various flue gas heat exchangers. However， various methods for calculating the fin efficiency of solid and serrated helical-finned tubes have been used in the literature， which makes it inconvenient to compare the experimental results of helical-finned tube heat transfer by different researchers. Based on a comprehensive analysis and comparison， the calculation methods of fin efficiency of solid and serrated helical-finned tubes were recommended for the design of heat exchanger and the processing of experimental heat transfer data. The comparison of fin efficiency between the solid and serrated fin tubes indicated that the serrated fin has a higher fin efficiency than the solid fin， and the fin efficiency difference between the two types of finned tube increased with the increase in fin height. The fin efficiency of the serrated fin tube is approximately 15% higher than that of the solid fin tube when the fin height is equal to 28 mm； the fin efficiency of the serrated fin tube is only 1% higher than that of the solid fin tube when the fin height is equal to 12 mm.

　　Key words：

　　HRSG； helical-finned tube； solid fin； serrated fin； fin efficiency

　　在聯合循環余熱鍋爐、化工廢熱鍋爐等大型高溫煙氣換熱設備中，通過高頻電阻焊接技術制造的螺旋翅片管（翅片材質為碳鋼或合金鋼）得到了廣泛應用.實際應用的高頻焊螺旋翅片管分為連續型與鋸齒型兩大類，如圖1所示.其中，d0為基管外徑；df為翅片外徑；hf為翅片高度；pf為翅片螺距；hs為鋸齒高度；ws為鋸齒寬度；δf為翅片厚度.鋸齒型