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

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.