O2 and CO2 combined supply oxygen-enriched combustion air supply system suitable for tangential boiler

The invention relates to the field of oxygen-enriched combustion, and discloses an O2 and CO2 combined supply oxygen-enriched combustion air supply system suitable for a tangential boiler, the system comprises a gas mixing tank, and the gas inlet end of the gas mixing tank is connected with a carbon dioxide pipeline and an oxygen pipeline; an oxygen heater is arranged on the oxygen pipeline, and an oxygen heater bypass pipeline is arranged on the oxygen pipeline; a heater front regulating valve is arranged in front of the oxygen heater, and an oxygen heater rear regulating valve is arranged behind the oxygen heater; an oxygen heater bypass pipeline regulating valve is arranged on the oxygen heater bypass pipeline; the gas outlet end of the gas mixing tank is connected with a mixed gas main pipeline; and the output end of the mixed gas main pipeline is communicated with a lower secondary air chamber of a first-layer combustor and an upper secondary air chamber of the first-layer combustor in the boiler. The pr