Municipal solid waste gasification by hot recycling blast furnace gas coupled with in-situ decarburization to prepare blast furnace injection of hydrogen-rich gas

Abstract

Waste-to-energy is one of the most effective methods to save energy and reduce carbon emissions. This paper proposes a novel process of municipal solid waste (MSW) gasification by hot recycling blast furnace gas (BFG) coupled with in-situ decarburization to prepare blast furnace injection of hydrogen-rich gas. MSW gasification by the hot BFG is conducted by using Aspen Plus software coupled with equilibrium model or kinetic model. Compared to the equilibrium model, kinetic simulation results exhibit good agreement with the experimental results. Moreover, the technological analysis is also performed to investigate the coupled effects of gasification temperature, MSW/BFG ratio, and steam/MSW ratio on the H₂-rich syngas generated from MSW gasification. The results reveal that all the investigated influencing factors have been found with a significant effect on the H₂-rich syngas formation. The 25.95 vol% of H₂ and 37.20 vol% of CO during MSW gasification by the hot BFG are achieved at a gasification temperature of 900 °C, steam/MSW ratio of 0.46 kg/kg, and MSW/BFG ratio of 0.34 kg/Nm³.

Keywords: Carbon reduction; H(2)-rich syngas; MSW gasification; Recycling blast furnace gas.