燃煤锅炉低温再热器受热面综合治理

Comprehensive treatment of heating surface for low-temperature reheater of coal-fired boiler

介绍了某电厂2台锅炉低温再热器多次泄漏及再热汽温偏低等情况,对引起该问题的原因进行了全面分析,提出了解决思路及具体方法,即在保持低温再热器及低温过热器侧烟气份额分配设计值不变的情况下,减少低温再热器管排数量,增大烟气流通截面积,从而降低烟气流速,减轻磨损。同时,低温再热器侧通过扩展受热面的方法,增加低温再热器换热面积,达到了减轻低温再热器磨损并增加再热汽温的目的。

For a certain power plant,low-temperature reheaters of two boilers leak many times and the reheat steam temperature is lower. This paper introduces the problems,comprehensively analyzes their reasons,and proposes solving idea and concrete method,that is,to reduce the number of tubes of low-temperature reheater and enlarge the flow sectional area of flue gas while keeping the designed flue gas distribution value between sides of low-temperature reheater and low-temperature super heater constant in order to decrease flue gas velocity and reduce wearing.In addition,through expanding the heating surface to enlarge the heat exchange area of low-temperature reheater,it could reduce the wearing and increase the reheat steam temperature of lowtemperature reheater.