減少氮氧化物 低污染燃燒器 火上空氣口 爐底再循環燃氣風門 燃氣混合風扇 燃氣再循環風扇 強噴嘴 弱噴嘴 隔離燃氣 DeNOx Pollution minimum burner PM burner Over firing air port Bottom gas recirculation damper BGR Gas mixing fan GMF Gas recirculation fan GRF Concentrated nozzle CONC Weak nozzle Flue gas recirculation through the windbox SGR