Title:
BioSyn Biomass Gasification Process for the Production of a Tar-Free Synthesis Gas
Author(s):
Burhenne, L., Rochlitz, L., Lintner, C., Aicher, T.
Document(s):
Paper
Abstract:
A novel fixed¬bed biomass gasification process ("BioSyn gasifier") for the production of tar¬free synthesis gas was developed and demonstrated at Fraunhofer ISE. The process consists of four zones, namely gasification, partial combustion, cracking and a reduction/oxidation (redox) zone. The zones are separated by moving grates to control the residence time of the biomass in every step. Thermal cracking of all higher hydrocarbons and tars is achieved by temperatures in the cracking zone up to 1000 °C, ensured via a partial combustion of the raw gas. Besides, the coke in the cracking zones acts autocatalytically. In order to increase the heating value of the product gas and hence, the overall efficiency of the process, all remaining carbon is oxidized and CO from the reduction zone is mixed with the product gas. The produced gas is used for combined heat and power production with a gas engine. To demonstrate the feasibility of the process a pilot plant with 50 kWLHV(biomass) was designed, commissioned and tested with wood pellets. The gasifier produced a combustible gas with a lower heating value of 5,8 MJ/m³ and CO, H2 and CH4 concentrations of 26, 15 and 2%, respectively. Tar contents below 30 mg/ m3N could be achieved in continuous operation. The results suggested a considerable effect of the temperature and the bed height in the tar cracking zone on the reduction the CH4 concentration which is associated with the decrease of the tar content in the produced gas. After knowing the optimal gasification parameters for the operation with wood pellets, other biomass such as biocoal was tested.
Keywords:
biomass, combined heat and power generation (CHP), gasification, tar, thermochemical conversion, renewable energies
Topic:
R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Gasification for power, CHP and polygeneration
Event:
20th European Biomass Conference and Exhibition
Session:
2CO.4.2
Pages:
832 - 836
ISBN:
978-88-89407-54-7
Paper DOI:
10.5071/20thEUBCE2012-2CO.4.2
Price:
FREE
