燃煤机组空预器低温腐蚀解决方案浅析

Brief Analysis on Low-temperature Corrosion Solution About Air Preheater of Coal-fired Units

[目的]空预器低温腐蚀危及电厂锅炉的运行安全,需要对解决燃煤机组空预器低温腐蚀的不同方案的技术特点进行分析比较。[方法]分析了空预器的低温腐蚀解决方案。通过技术分析、能耗分析对提高空预器冷端空气温度暖风器方案和热风再循环方案进行了技术探讨。[结果]暖风器方案和热风再循环方案在解决空预器的低温腐蚀问题上各有其技术特点,暖风器方案虽然设备初投资比较大,但其系统特点具有明显的优势。[结论]对于空预器的低温腐蚀问题,暖风器方案的适用性更广。

[Introduction] The low-temperature corrosion of the air preheater endangers the safety operation of the boiler in the pow-er plant. It is necessary to analyze and compare the technical characteristics of different solutions of the low temperature corrosion about the air preheater in the coal-fired units. [Method] The article focused on the low-temperature corrosion solution about air preheater. Two solutions which were steam-air heater system and hot air recirculation system were used to increase the cold end air temperature of air preheater by technical analysis and energy consumption analysis. [Result]Steam-air heater system and hot air recirculation system have advantages. Although the initial investment of the steam-air heater system is relatively large,its system features have obvious advantages. [Conclusion]The application of the steam-air heater system is more extensive for the low temperature corrosion problem of air preheater.