Title:
Influence of Biomass Loading Frequency on Performances of a Stratified Biomass Gasifier
Author(s):
Allesina, G., Pedrazzi, S., Tartarini, P.
Document(s):
Paper
Abstract:
Since the first employment of gasification technology for power production, most gasifiers have been designed to work with continuous loading, but the filling methods and controls actually discretize the charge in a series of small batches. The loading frequency of these batches, as well as other control variables in a gasification power plant, can deeply influence its performance, such as syngas HHV, tar and water production. Downdraft stratified gasifiers seem to be the most influenced reactors by the loading conditions. These phenomena are due to the small thickness and superficial placement of the flaming pyrolysis layer in this kind of gasifier. This work is aimed at investigating the influence of loading conditions on a 160 kWel gasification power plant. Results have shown great variations in most of the plant outputs acquired during the experimental campaign: five days of tests for each loading condition (4¬second¬long and 15¬second-long). The 15¬second loading tests showed some scattered results that suggested the coexistence of pyrolysis and combustion zones in the reactor. These phenomena have been explained by the parallel running of two modified mathematical models that were obtained coupling Reed and Wang mathematical approach. Models results confirmed the presence of "chimneys" in the reactor where the majority of the air passes.
Keywords:
engine, gasification, modelling, loading
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:
2BV.2.5
Pages:
1011 - 1016
ISBN:
978-88-89407-54-7
Paper DOI:
10.5071/20thEUBCE2012-2BV.2.5
Price:
FREE
