沙角A电厂5号锅炉空气预热器改造

沙角A电厂1025t／h锅炉原配围带传动三分仓容克式回转空气预热器，投运以来空气预热器漏风率大，影响锅炉安全及经济运行。采用中心传动带间隙调节系统的三分仓回转式空气预热器对愿空气预热器进行更换。文中介绍了新型空气预热器的结构和参数，改造安装遇到的问题和经验教训，并对改造前后空气预热器的经济性进行了分析。改造总投资1450万元，预计3．29a可收回全部投资，为同类型锅炉空气预热器的改造提供参考。

Analysis on air preheater of boiler No.5 in Shajiao A Power Plant

The 1 025 t/h boiler was originally equipped with a round-belt-driven Ljungstorm tri-sector regenerative air preheater in Shajiao A Power Plant. The air leakage rate was high since the air preheater was commissioned and affected boiler safe and economic operation. A center-driven tri-sector air heater with a clearance adjuster was adopted to replace the original air preheater. The structure and parameters of the new air preheater are introduced with the problems and experience met in the replacement. The economy of the air preheater before and after reform is also introduced. The total investment of the reform was RMB 1.45 million yuan and it is expected to pay off in 3.29 years. The reform in this power plant may be a reference for the reform of the same type air preheaters.