An efficient integrated power generation system of solid waste coupled with anaerobic fermentation and incineration is proposed. Solid waste anaerobic fermentation is adopted to generate biogas

which enters the biogas burner to burn and generates high-temperature flue gas

and the flue gas heats the steam-water system and the primary and secondary air through the heater and air preheater in the unit. Under the condition that the heat generated by solid waste incineration in the boiler is not changed

the energy entering the steam turbine to do work is increased

thus the power generation efficiency of the whole unit increases. At the same time

according to the first law of thermodynamics and the second law of thermodynamics

the reasons for power generation efficiency and exergy efficiency improvement are analyzed. The results show that

compared with the case unit

the proposed hightemperature flue gas system with biogas combustion can increase the net power generation by 8.69 MW. In addition

the power generation efficiency and power generation exergy efficiency of the new system has increased by 3.56percentage points and 9.74 percentage points

respectively. Economic analysis shows that the proposed coupling system is equipped with an anaerobic fermentation biogas combustion system

and the dynamic recovery period is 3.78 years

which has obvious economic advantages.