300 / 2024-03-15 09:05:52

Effects of municipal solid waste compositions on co-gasification performance under CO2 atmosphere

municipal solid waste,physical composition,CO2 gasification,energy recovery,carbon conversion

6、能源资源清洁加工与转化利用 > 8、固废资源综合利用

CO₂ gasification of municipal solid waste (MSW) is an effective way of CO₂ utilization and energy recovery. However, the effect of complex MSW compositions on co-gasification characteristics is still unclear. In this work, the contribution of kitchen waste, paper, electronic waste, plastic, rubber, and wood is explored by comparing the co-gasification performance parameters of experimental MSW (Exp-MSW) and calculated MSW (Cal-MSW). The results show that the activation energy of Exp-MSW (42.06 kJ/mol) is smaller than that of Cal-MSW (68.90 kJ/mol) in the volatile decomposition stage (≤700 ℃), but larger in the carbon gasification stage (800-900 ℃). The average activation energy of Exp-MSW (99.32 kJ/mol) is slightly smaller than that of Cal-MSW (99.80 kJ/mol), indicating the potential promotion effect of the MSW composition interaction. Principal component analysis shows that the biomass and paper contribute to a greater maximum weight loss rate of Exp-MSW (7.66 %/min) than that of Cal-MSW (6.66 %/min) in the volatilization stage. In the carbon gasification stage, the contribution of electronic waste and wood leads to a smaller maximum weight loss rate of Exp-MSW (5.49 %/min) than Cal-MSW (7.91%/min). At 700-900 ℃, the gasification cold gas efficiency (38.72%→68.40%) and carbon conversion ratio (23.43%→43.72%) of Exp-MSW increase with increased temperatures, which are all higher than those of Cal-MSW. The positive contribution of paper, kitchen waste, and rubber is significant, while that of electronic waste is negligible. The results of this work can provide classification guidance for the CO₂ gasification disposal of mixed MSW.