空气分级燃烧对再热汽温静态特性的影响

Study on Effects of Air-Staging Combustion on the Static Characteristics of Reheat Steam Temperature

空气分级燃烧技术对炉膛燃烧和辐射换热过程有着明显影响,分析认为低负荷时再热汽欠温是由于主燃烧区烟温较高、辐射换热量较大引起的。理论分析和现场试验研究表明,优化锅炉运行氧量、炉膛-风箱差压设定值可以提高火焰中心高度,显著改善低负荷时再热汽欠温的状况,对指导空气分级燃烧的运行优化有一定的参考价值。

The air-staging combustion has great impacts on furnace combustion and radiant heat exchanging processes. The analysis figures out that the reheat steam under temperature at low loads is attributed to high flue gas temperature and substantial radiant heat exchange volume in the main combustion zone. In addition, the theoretical analysis and the field tests indicate that the optimization of oxygen contents and furnace-windbox differential pressure may raise the reheat steam temperature, thus improving the performance of reheat steam under temperature at low loads. This paper may provide valuable reference for the operation optimization of boilers with air-staging combustion.