Title:
Primary Tar Reduction by Fe-Olivine as Catalytically Active Bed Material in a Dual Fluidised Bed System for Steam Gasification of Biomass
Author(s):
Koppatz, S., Pfeifer, C., Hofbauer, H.
Document(s):
Paper
Abstract:
Tars and lower hydrocarbons are undesired products of every gasification process, since the condensation of these impurities causes clogging or blockage in downstream process units. Therefore these gaseous impurities are a central item in the development of biomass gasification. The present work focuses on primary tar reduction in a dual fluidised bed system for biomass steam gasification, since primary measures are a promising option for improvement of the overall gasification technology. Within the work a Iron-catalyst (Fe-olivine) is investigated as reactive bed material for fluidised bed processes, since Fe is a non-toxic material for tar reforming. The examinations are conducted at a 100 kW fuel power dual fluidised bed gasifier system. Biomass gasification experiments with the Fe-catalyst are performed over a defined temperature range of 770 – 850°C. The syngas is analysed with regard to the H2, CO, CO2 and CH4 content. Furthermore the tar content and composition is determined according to gravimetric and GC/MS method in accordance with the tar protocol. The results show the influence of the temperature on the syngas composition as well as on the tar content and composition. To highlight the effect of the Fe, the results are compared with previous experiments, which were carried out with conventional olivine as bed material. The comparison reveals the effect of the Fe, which enhances mainly the tar conversion, since lower tar contents are determined. The application of the Fe-catalyst bed material contributes to the gasification overall efficiency. Due to the tar conversion, the products of the tar reforming (H2 and CO) contribute to the heating value of the syngas.
Keywords:
catalyst, dual fluidized bed, syngas, tar removal, biomass gasification
Topic:
Thermochemical conversion - Gasification for power and CHP and polygeneration
Subtopic:
Gasification for power and CHP and polygeneration
Event:
18th European Biomass Conference and Exhibition
Session:
VP2.1.32
Pages:
710 - 714
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-VP2.1.32
Price:
FREE
