Title:
Release and Conversion of Fuel-bound Nitrogen during Fixed-bed Gasification and Subsequent Staged Combustion
Author(s):
Mandl, C., Obernberger, I., Benesch, C., Scharler, R.
Document(s):
Paper
Abstract:
This paper presents experimental results derived from test runs performed with a laboratory-scale updraft fixed-bed gasifier coupled to a combustion chamber to produce data for the investigation of the release behaviour and the conversion of fuel-bound nitrogen during gasification and subsequent staged combustion of the producer gas using softwood pellets. The concentrations of relevant nitrogenous gas species including tars have been measured in the producer gas and at different positions in the combustion chamber. Based on the experimental measurements and results derived from the test runs, the pathway of the fuel-bound nitrogen could be described. Results show that during updraft fixed-bed gasification the fuel-bound nitrogen is mainly released as N bound in tars from the packed bed and is then subsequently released as HCN, NO, NH3 and N2 as a result of tar cracking during combustion. This strong N-fixation in the tars was not expected. It is of great relevance for the understanding of the behaviour of the fuel-bound nitrogen as a basis for a low-NOx combustion of the producer gas.
Keywords:
fixed bed gasification, nitrogen release, staged combustion
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Poligeneration and CHP
Event:
19th European Biomass Conference and Exhibition
Session:
OA8.4
Pages:
996 - 1001
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-OA8.4
Price:
FREE
