Low NOx combustion technology of China and staged combustion

When coal is burned, three types of NOx are formed: thermal NOx, quick NOx and fuel NOx. According to the fact of China, improved combustion and better operating environment are effective measures of NOx control. Main methods are: low oxygen combustion, staged air combustion, smokes recycle, CFB and fuel re-combustion. This paper discusses the technology of staged air combustion of which coal bums under the condition of lean oxygen and rich oxygen. The injected positions of staged air affect on the NOx emission. The lower injected positions are, the fewer NOx emissions are.