A tentative idea of adding combustionstabilizing body and central air at the outlet of burners has been put forward

the ignition and stable combustion of pulverized coal and air flow can be realized by controlling the hot back flow amount of high temperature flue gas with aid of the central air magnitude. Study results show that the central back flow zone of each section outside the jet has been obviously improved by the combustionstabilizing body and the central air

and making the variation of velocity distribution outside the jet to be gently

but excessive central air can destroy the back flow zone. The optimization of adopting combustionstabilizing body and central air (4%) can make the tunable rich/lean berner to really realize the high efficient combustion

stable combustion at low load

and low emission of NO_x.