Hydrothermal gasification of biomass and organic wastes

✍ Scribed by H. Schmieder; J. Abeln; N. Boukis; E. Dinjus; A. Kruse; M. Kluth; G. Petrich; E. Sadri; M. Schacht

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 120 KB
• Volume: 17
• Category: Article
• ISSN: 0896-8446
• DOI: 10.1016/s0896-8446(99)00051-0

✦ Synopsis

Wet biomass and organic wastes can be efficiently gasified under hydrothermal conditions to produce a hydrogen rich fuel gas. New experiments in two tubular flow reactors and in two batch autoclaves with carbohydrates, with aromatic compounds, with glycine as a model compound for proteins and with real biomass are reported for different residence times, temperatures and pressures. It was found that at 600°C and 250 bar all compounds are completely gasified by addition of KOH or K 2 CO 3 , forming a H 2 rich gas containing CO 2 as the main carbon compound. Concentrations of CO, CH 4 and C 2 -C 4 hydrocarbons are low in the product gas (B 1, 3 and B 1 vol%, respectively). Carbon balances for the smaller flow reactor are closed to better than 96%. Ranges of product concentrations are given as estimated from experimental reproducibility. Some reflections for the engineering of a pilot plant are presented.