Title:
Air Staging and In-bed Quenching for Autothermal Generation of Char and Low-tar Producer Gas
Author(s):
Kirch, T., Birzer, C.H., van Eyk, P.J., Hall, P.A. , Medwell, P.R.
Document(s):
Paper
Poster
Abstract:
A fixed bed downdraft reactor for the combined production of char and producer gas through autothermal conversion of a solid biomass fuel was developed. The removal of tars from the products of thermochemical biomass conversion has been identified as a major challenge for efficient application of producer gas in heat and power generation. In this work, a single fixed bed reactor is investigated that combines multiple tar reduction mechanisms. The fixed bed reactor was designed to accommodate a primary air supply, to sustain an autothermal reaction front, and air staging capabilities downstream of the reaction front. Downstream of the air staging zone the reactor is externally water cooled to quench all oxidation processes within a solid char bed. Cooling the gas in a char bed allows for condensation and absorption of remaining volatile producer gas contaminants. Increasing the total air supply flux from 0.058 to 0.072 kg·m-2·s-1 has led to greater process temperatures, and a reduction of tars from 206 to 63 mg·mN-3 in the producer gas. The particulates content in the producer gas is <6 mg·mN-3 in all cases. The potential for the combined production of a char and a low tar content producer gas has been successfully demonstrated for a simple single reactor multi-stage autothermal process.
Keywords:
gasification, product gas, tar, biochar
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Gasification for power, CHP and polygeneration
Event:
27th European Biomass Conference and Exhibition
Session:
2CV.2.32
Pages:
876 - 880
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-2CV.2.32
Price:
FREE
