Reburning of Animal Waste Based Biomass with Coal for NOx Reduction, Part I: Feedlot Biomass (FB) and Coal:FB Blends

Cattle biomass (CB or manure from cattle) is proposed as reburn fuel under slightly fuel-rich conditions. The CB includes wastes from cattle feedlots (cattle grown in feedlots to slaughter weights of 450–640 kg) termed as Feedlot Biomass (FB) and cattle wastes from dairy farms termed as Dairy Biomas...

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Bibliographic Details
Published in:Energies (Basel) 2021-12, Vol.14 (23), p.8030
Main Authors: Oh, Hyukjin, Annamalai, Kalyan, Goughner, Paul G., Thien, Ben, Sweeten, John M.
Format: Article
Language:English
Subjects:
09 BIOMASS FUELS
Agricultural wastes
Animal wastes
Atmospheric pressure
Biomass
Boilers
Cattle
cattle biomass
cattle biomss
Cattle industry
co-firing
Coal
Coal-fired power plants
combustion
Composting
Current injection
Dairy cattle
Dairy farming
Dairy farms
Efficiency
Emissions
Energy & Fuels
Equivalence ratio
Experiments
Factory farming
Feedlots
Gases
Heat exchangers
Intensive farming
Literature reviews
Manures
Mixtures
Nitrogen oxides
NOx reduction
Power plants
reburn
Reburning
renewable energy
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Summary:Cattle biomass (CB or manure from cattle) is proposed as reburn fuel under slightly fuel-rich conditions. The CB includes wastes from cattle feedlots (cattle grown in feedlots to slaughter weights of 450–640 kg) termed as Feedlot Biomass (FB) and cattle wastes from dairy farms termed as Dairy Biomass (DB). NOx emissions from coal-fired power plants can be reduced by using pure CB and Coal:CB mixtures as reburn fuels (10~30% by heat) injected after the primary combustion region. Experiments with Coal:CB mixtures as reburn fuels were performed using the 30 kW burner facility. Part I deals with results from experiments using pure FB and Coal:FB blends as reburn fuels while Part II presents results on extent of NOx reduction using pure DB and Coal:DB blends as reburn fuels (RF). In the current work, results on NOx emission are presented with FB and Coal:FB blends as RF. The parametric studies include: equivalence ratio in reburn zone (ERRBZ), vitiated air, angle of reburn nozzles, presence and absence of heat exchangers (HEXs), and baseline NOx concentration. The optimum operating conditions for FB reburning were found to be conditions with vitiation at ERRBZ = 1.1 with 45° upward counter-current injection in the presence of HEXs. NOx emissions were reduced by as much as 96%.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14238030