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Municipal solid wastes pyro-gasification using high-temperature flue gas as heating resource and gasifying agent
Shaoheng Ge1, Dezhen Chen1, Lijie Yin1
1Thermal and Environmental Engineering Institute, School of Mechanical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Engineering Research Center of Multi-source Solid Wastes Co-processing and Energy Utilization, 1239 Siping Road, Shanghai 200092, China.
This study explores using high-temperature flue gas (HTFG) to reform volatile compounds from municipal solid waste (MSW) pyrolysis. The research shows HTFG composition significantly impacts syngas quality and energy recovery from waste.
Area of Science:
- Waste Management and Energy Recovery
- Chemical Engineering and Process Optimization
- Environmental Science and Technology
Background:
- Municipal solid waste (MSW) pyrolysis offers a route to energy recovery from combustible waste fractions.
- Effective treatment of volatile compounds and char is crucial for optimizing syngas production.
- High-temperature flue gas (HTFG) presents a potential resource for enhancing pyrolysis processes.
Purpose of the Study:
- To investigate the reforming of volatile compounds from MSW pyrolysis using char and HTFG.
- To evaluate the influence of HTFG composition and flowrate on syngas, char, and oil yields and properties.
- To determine optimal conditions for producing high-quality syngas from MSW.
Main Methods:
- A tailor-made experimental setup was used to reform MSW pyrolysis volatiles.
- Char from MSW pyrolysis acted as a reforming agent.
- HTFG (1200 °C), including CO2, H2O, and a model flue gas mixture, was employed as a heating and gasifying agent.
- Product yields (syngas, char, oil) and properties (Higher Heat Value - HHV, Cold Gasification Efficiency - CGE) were analyzed.
Main Results:
- HTFG composition significantly influenced product yields and quality.
- CO2 and H2O in HTFG enhanced char gasification and volatile reforming.
- Increased model flue gas flowrate led to higher CGE (>75%) and improved syngas HHV, surpassing direct air gasification.
- Volatile reforming reactions competed with, and partially inhibited, char gasification.
Conclusions:
- HTFG reforming is an effective strategy for upgrading syngas from MSW pyrolysis.
- The use of CO2 and H2O in HTFG improves energy recovery and gasification efficiency.
- This research provides valuable insights for optimizing MSW valorization into high-quality syngas.
