Experimental investigation of sewage sludge solid waste conversion to syngas using high temperature steam gasification. (15th February 2018)

• Record Type: Journal Article
• Authors: Lee, Uisung; Dong, Jun; Chung, J.N.
• Is Part Of: Energy conversion and management. Volume 158(2018)
• Page Start: 430
• Page End: 436
• Publication Date: 2018-02-15
• Subjects: Steam gasification -- Sewage sludge -- High temperature -- Waste -- Dynamics -- Carbon conversion -- Batch process; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2017.12.081
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Syngas with high hydrogen concentration was produced via steam gasification of sewage sludge. Dynamics of the gasification process was investigated, which reflected kinetic reaction rates. Hydrodynamics in the reactor affects the syngas production as well as the thermochemical characteristics. Sewage sludge decomposition rates were investigated by analyzing carbon conversion over time. Abstract: Sewage sludge from wastewater treatment facilities needs to be treated before it can be disposed of. While it is typically processed through an anaerobic digestion process, sludge can also be a good feedstock for alternative fuel production. High-temperature steam gasification is a process that decomposes organic materials into synthesis gas (syngas) with a high hydrogen concentration. In this study, a lab-scale steam gasification system which converts sewage sludge into valuable syngas was developed and experimentally evaluated. This study specifically focuses on investigating the chemical kinetics of syngas generation and feedstock decomposition in a batch process. The syngas generation rates and concentrations of syngas constituents were measured, and changes in carbon balance during gasification were tracked with respect to time, which shows how reaction rates vary over time. It was found that variations in steam flow rates modified the gasification reactions both thermodynamically and hydrodynamically. The gasification processes were fitted into logistics curves to understand the effects of different steam flow rates. The results indicate that the chemical reaction velocity can be controlled to achieve optimum operating conditions, which potentially can reduce both processing time and steam consumption while maximizing the syngas yield. This study would contribute more to the complete understanding of the sewage sludge gasification processes and the kinetics of the gasification chemical reactions.