The kinds of newly developed burners in china are numerous

these newly developed burners are mainly used for retrofitting burners in coal-fired boilers.From aspects

such as combustion-stabilizing principle

residence time of burning products

flame temperatrure level

and the NOx emission etc.

the functions of several burners and their limitations have been analysed.For boilers with bad statility of combustion

adoption of retrofitting burners to enhance combustion stabilizing performance is fully feasible.So far ao the reduction of unburned combustibles in fly ash and the decrease of NOx emission are concerned

effective results are often difficult to be obtained through retrofitting boilers and burners.For this

the feasible way is to start with the fuel coal

adopting staged combustion technology in the entire furnace

whether to decrease the fineness of pulverized coal by a big margin

or to adopt compact form over-fired air(CFOA) and separated form overfired air(SFOA) etc..