Title:
Gasification of Herbage in Supercritical Water, Experimental Results
Author(s):
Boukis, N., Neumann, M., Galla, U., Dinjus, E.
Document(s):
Paper
Abstract:
The gasification of fresh herbage (grass) in supercritical water has been optimized in a labscale apparatus and then has been tested in the pilotplant scale. A high gasification yield is possible. The product gas consists of hydrogen, methane and some short chain hydrocarbons. The pretreatment of fresh herbage is complex. Sand should be removed by washing, size reduction with cutting devices and dilution to less than 10 wt. % DM. An enzymatic treatment at elevated temperatures for 24 h is useful for the subsequent gasification. Optimized process conditions are temperature of 650 °C, pressure of 28 MPa and mean residence time of 2 – 4 min; the resulting gasification yield of 98 % is high, also the hydrogen concentration. CO2 can be removed by a water scrubber at a pressure of 10 – 20 MPa. Due to technical boundaries the reaction temperature in the pilotplant experiments was lower and consequently the gasification yield was lower.
Keywords:
gasification, grass, hydrogen, pilot plant
Topic:
Thermochemical conversion - Gasification for power and CHP and polygeneration
Subtopic:
Technology development
Event:
18th European Biomass Conference and Exhibition
Session:
OA4.2
Pages:
562 - 566
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-OA4.2
Price:
FREE