To make a commitment on limiting temperature rise to 1.5 ℃, it is necessary to reduce the fossil fuel consumptions and greenhouse gas emissions. The bioenergy with carbon capture and storage （BECCS） technology has received extensive attention. A model of monoethanolamine（MEA）-based chemical absorption CO2 capture systems is developed. By comparing the performances of carbon capture systems in the biomass power plants taking wood,herb biomass and municipal solid waste as fuels and the coal-fired power plants taking bituminous and lignite as fuels,it is found that their flue gas composition are varied, and the CO2 capture rate, energy consumption and economic benefits of installing CO2 capture systems are different. The simulation results show that the CO2 volume fractions in biomass-combusted flue gas（bio-FG） whose components are varied with the types of fuels are more widely distributed than that in coal-fired flue gas. With the same lean MEA solution, the capture system's CO2 capture rate of bio-FG, except herbal biomass,reaches 63.73%-92.08%.It is higher than that of coal-fired flue gas which is 59.24%-79.53%. Except municipal solid waste's flue, the reboiler energy penalty and condenser energy penalty of bio-FG are 3.89-4.00 GJ/t and 1.57-1.71 GJ/t,respectively.They are lower than that of coal-fired flue gas which are 3.90-4.29 GJ/t and 1.61-1.97 GJ/t,respectively. Bio-FG leads to a slower oxidative degradation of MEA. On the premise of consistent and sufficient heat supply, the economic benefit brought by the installation of a CO2 capture system to a coal fired power plant is larger than that to a biomass power plant, however, the overall economic benefit of the biomass power plant is higher.
