Thermodynamic research on chemical looping gasification of sludge and municipal solid waste: hydrogen production and waste recycling

In the era of rapid urbanization and environmental concerns, efficient waste resource utilization is vital for sustainable development. This study innovatively constructs a hydrogen production system model for municipal solid waste and sludge chemical looping gasification (MSCLG). The research finds that the optimal operating condition is when the mass mixing ratio of sludge to MSW is 4:6. Under the conditions of 680°C and 1 atm, the H₂ concentration at the outlet of the gasification reactor exceeds 70%. In the simulation, with a flow rate of 4000 kg/h for CS-MgO-ZrO₂ and 6000 kg/h for steam, when the carbon conversion rate is 0.8 and the syngas injection ratio is 0.15, the system achieves self-heating and generates 14.57 kW of heat. When combined with a CCS module, near-zero carbon emissions can be basically achieved, offering an efficient way for urban waste energy use and green hydrogen production.