锅炉冷风加热系统方案综合对比分析

Comprehensive Comparison and Analysis on Cold Air Heating System Schemes in Boiler

为探究避免锅炉空气预热器腐蚀的更优系统,以江苏某660 MW超超临界燃煤机组为应用对象,对比了目前实际运行中常用的3种系统,即热风再循环联合低温省煤器系统、蒸汽暖风器联合低温省煤器系统、水媒暖风器联合低温省煤器系统,分别从结构、性能和经济性方面考虑,选出最适合机组的系统。结果表明:在冬季工况下,水媒暖风器联合低温省煤器系统运行的可靠性较好、可调性较好、节煤量最大、投资回收期最短,综合性能最佳。

In order to explore a better system for preventing the corrosion of air preheater,taking a 660 MW ultra-supercritical coal-fired unit in Jiangsu Province as an application object,comparisons were conducted on following present commonly used three systems in actual operation,namely the system of hot air recirculation combined with low temperature economizer,the system of steam-medium air heater combined with low temperature economizer,and the system of water-medium air heater combined with low temperature economizer.After which,the most suitable system for the unit was selected from the aspects of structure,performance and economy.Results show that,under winter condition,the system of water-medium air heater combined with low temperature economizer has a best comprehensive performance with a better reliability,a better adjustability,a maximum coal saving,and a shortest investment payback period.