Abstract: Thermal calculation method was constructed to complete the performance evaluation and adaptability analysis of a 130 t/h oxygen-enriched biomass combustion grate boiler. Results show that under the air supply condition with 26.7% oxygen content, the superheater water spray rate is appropriate, the furnace combustion temperature is equivalent to the conventional air combustion condition, and the exhaust gas temperature is lower than the maximum allowable operating temperature of the dust collector. Under oxygen-enriched combustion conditions, the boiler efficiency increases by 0.7%, and the flue gas volume decreases by 25% compared with air conditions. The risk of high-temperature corrosion and ash accumulation increases, the wear risk decreases and the low temperature corrosion risk is small. The boiler shows good adaptability. The dust concentration in the flue gas increases by 33%, the SO₂ volume fraction remains basically unchanged, the NO_x volume fraction decreases, and the environmental protection system demonstrates good adaptability. The high concentration of CO₂ under oxygen-enriched combustion conditions creates favorable conditions for low-cost green carbon capture.