Title:
Experimental Study of a Downdraft Char Gasifier: Variation of Temperature and Gas Concentration in the Radial and Longitudinal Directions
Author(s):
De Paula-Oliveira, A., Brammer, J., Van de Steene, L.
Document(s):
Paper
Abstract:
Biomass gasification is considered today as a promising route for energy production, including electricity, natural gas or synthetic biofuels. Mechanisms involved in such processes are very complex and need further understanding. In downdraft gasification processes, the gasification zone containing carbon residues (char) is fundamental to the energy efficiency and the quality of gas produced. This work provides the necessary data for validation of 2D CFD codes to investigate the behaviour of the gasification zone of a downdraft gasifier. The experiments were performed in a cylindrical reacting char bed and measurements of pressure drop, gas composition (longitudinal direction) and temperature (radial and longitudinal directions) were made. The char bed height was kept to 65 cm and the product gas was extracted through the bottom of the reactor and taken to a combustion chamber for final oxidation, after passing through a cyclone which separates the fine particles. Profiles of gas composition and temperature are presented for two different inlet gas compositions. In both cases the temperature varied by up to 100ºC from the centre to the wall of the reactor.
Keywords:
char, fixed bed, gasification, sampling, syngas
Topic:
Thermochemical conversion - Gasification for synthesis gas production
Subtopic:
Gasification for synthesis gas production
Event:
18th European Biomass Conference and Exhibition
Session:
VP2.2.18
Pages:
869 - 875
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-VP2.2.18
Price:
FREE
