Low-NOx coal combustion via combining decoupling combustion and gas reburning

► Low-NOx emission is realized by combining decoupling combustion and gas reburning. ► Performances of decoupling combustion and gasification gas reburning were evaluated. ► Above 33% NOx emission can be reduced in decoupling combustion process. ► A 1.4 MW boiler was developed based on the principle of decoupling combustion and gas reburning.