| 摘要 |
In order to suppress corrosion of a water wall tube and the like of a boiler and stabilize the combustion of a burner during an oxygen combustion operation of the boiler, this boiler combustion system is provided with a boiler (1) provided with a burner (5) and a two-stage combustion gas input port (9), an exhaust gas supply fan (29) for extracting exhaust gas from an exhaust gas treatment system of the boiler via an exhaust gas circulation line (27), a combustion gas supply line (31) diverging from the exhaust gas circulation line on the wave side of the exhaust gas supply fan, a fuel transfer gas supply line (33), a two-stage combustion gas supply line (35), an oxygen supply line (51) for supplying oxygen-enriched gas to the combustion gas supply line (31) and the fuel transfer gas supply line (33), combustion air supply fans (43, 45) provided in parallel with the exhaust gas supply fan (29) in order to supply combustion air, a switching means for switching between the operations of the exhaust gas supply fan and the combustion air supply fans, and dampers (57, 59) for adjusting the gas flow rates of the combustion gas supply line and the two-stage combustion gas supply line, respectively. |
