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

The invention discloses an oxygen-enriched combustion air supply system suitable for supplying O2 and CO2 jointly for a tangential boiler. In the prior art, carbon dioxide and oxygen are mixed to be supplied to a combustion system, after carbon dioxide is preheated, the temperature is high, oxygen comes from an air separation system, the temperature difference between carbon dioxide and oxygen is large, and direct mixing causes large energy loss. The device comprises a mixed gas main pipeline (11), one end of the mixed gas main pipeline is connected with a gas mixing tank (9) through a mixed gas flow regulating valve (10), the gas mixing tank is respectively connected with a carbon dioxide flow regulating valve (2), an oxygen heater rear regulating valve (6) and an oxygen heater bypass pipeline regulating valve (8), the carbon dioxide flow regulating valve is connected with a carbon dioxide pipeline (1), and the carbon dioxide pipeline (1) is connected with the mixed gas pipeline (1). The oxygen heater rear r