Title:
An Evaluation of Limitations of Co-Firing in Pulverized Fuel Facilities
Author(s):
Fuller, A., Maier, J., Miller, E., Kruczek, H., Fryda, L., Scheffknecht, G.
Document(s):
Paper
Abstract:
In the frame of the European co¬funded project DEBCO, advanced co¬firing applications of various feedstocks have been demonstrated in lab¬ scale up to industrial scale. This paper reports on the co¬firing of higher thermal shares of biomass beyond industrial practices in a 0.5 MWth pilot facility and smaller laboratory facilities. Findings from a large scale demonstration run are also highlighted. Results show that co¬firing of biomass up to about 50% thermal share is manageable. The combustion may be unstable with a thermal share beyond 50%. This is believed to be due to the combustion of the biomass volatiles that may delay the oxygen penetration necessary to start the residual char combustion. The O2 profile concentrations increased with the increase of biomass co¬firing in pilot scale tests, since volatile combustion likely creates a cloud around the char particle. This probably prolonged the combustion of both the larger biomass particles, as well as the coal char particles. As is shown in the results, this promotes undesired deposits, likely due to reduced zones that facilitate eutectic compound formations. The 100% thermal share of biomass combustion showed a stable combustion and no problematic deposit formations. However, other occurrences are shown such as alkali salt formations, giving rise to a more possible enhanced fouling problem.
Keywords:
biomass, co-combustion, co-firing, thermochemical conversion
Topic:
R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Solid biofuel combustion for large utility
Event:
20th European Biomass Conference and Exhibition
Session:
2CO.1.2
Pages:
793 - 806
ISBN:
978-88-89407-54-7
Paper DOI:
10.5071/20thEUBCE2012-2CO.1.2
Price:
FREE
