摘  要：本文是設計2噸燃氣鍋爐冷凝式煙氣熱回收換熱器的優化。設計中首先已知鍋爐的燃料參數，根據設計范圍，進行鍋爐的燃料與燃燒計算。燃料與燃燒計算包括理論空氣與理論煙氣容積的計算，根據煙氣出口情況設計換熱器，確定換熱器冷凝段和非冷凝段并計算各段的換熱量，由此計算兩端的換熱管長度，加入翅片，由翅片效率修正換熱長度，確定換熱器的布局，最后進行校核計算。

　　　主要內容和章節包括：

　　　第一章, 緒論，主要介紹了本次設計意義。

　　　第二章, 主要是鍋爐的熱力計算，包括理論空氣量和實際空氣量，煙氣量計算。

　　　第三章,  換熱器的換熱量的計算，包括露點溫度的確定，非冷凝段和冷凝段的換熱量的計算。

　　　第四章, 三種光管管長的設計方案，最終確定管子規格和冷凝段和非冷凝段管子長度。

　　　第五章, 換熱器管的布局，包括管間距，翅片效率，肋化效率，順排，幾排幾列，總管數等。

　　　第六章，本次畢業設計的最后總結。

關鍵詞：2t燃氣鍋爐;翅片管；設計校核

Abstract：This article is designed to two tons of condensing gas boiler flue gas heat recovery heat exchanger optimization. The design of the first known parameters of the boiler fuel, according to the scope of design, boiler fuel and combustion calculations. The calculation includes fuel and combustion theory of air with the theoretical calculation of flue gas volume and design heat exchanger according to the gas outlet to determine the heat exchanger condenser section and condenser section and calculate the heat, calculated at both ends of the heat exchange tubes length by adding fins, the fin efficiency correction. Heat exchanger  length , determine the layout of the heat exchanger, and finally checking calculation.

　　The main contents and chapters include:  

   Chapter 1, Introduction, introduces the design significance.

   Chapter 2, the main boiler thermodynamic calculations, including theoretical air and the actual amount of air, flue gas volume calculations

   Chapter 3, the heat exchanger heat transfer calculations, including the dew point temperature determined, non-condensing and condensing for the calculation of heat

   Chapter4 ，Three light pipe's design program, and ultimately determine the tube length of pipe specification and the condenser section and condenser section

   Chapter 5, the layout of the heat exchanger tube, including tube spacing, fin efficiency, the efficiency of the Rib, alignment, several rows and columns Explorer, the number of

   Concluded 6， The graduation project concluded

Key words：The 2t gas boiler; finned tube; design checking