Reburning of Animal Waste Based Biomass with Coals for NO x Reduction, Part II: Dairy Biomass (DB) and Coal–DB Blends

Hyukjin Oh, Kalyan Annamalai, John M. Sweeten and Kevin Heflin
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Hyukjin Oh: Mechanical Engineering, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843, USA
Kalyan Annamalai: Mechanical Engineering, Texas Engineering Experiment Station, Texas A&M University, College Station, TX 77843, USA
John M. Sweeten: Texas Agri-Life Research, Texas A&M University System, Amarillo, TX 70106, USA
Kevin Heflin: Texas Agri-Life Research, Texas A&M University System, Amarillo, TX 70106, USA

Energies, 2021, vol. 14, issue 23, 1-24

Abstract: Concentrated animal feeding operations (both slaughter and dairy cattle) lead to land, water, and air pollution if waste storage and handling systems are not effectively managed. At the same time, cattle biomass (CB), which includes both slaughter/feedlot biomass (FB) and dairy biomass (DB), have the potential to be a source of green energy at coal-fired power plants. Part I presented results on NOx reductions with pure FB or Coal: FB blends as reburn fuels. Part II deals with results from reburning with pure DB or Coal: DB blends as reburn fuels. A mixture of NG with a small amount of NH3 was used to generate the baseline NOx of 400–420 ppm (or 185–194 g/GJ). NOx emissions were found to be reduced by as much as 96% when reburning with FB. The effects of reburn fuel type, equivalence ratio (ER RBZ ) in the reburn zone, vitiated air, several injection configurations of reburn fuel and initial NO concentrations on NOx emissions were investigated. The ER RBZ shows a significant effect on the NOx reduction. The 20% heat input by reburning was the better operating condition for the long-term operation due to its ash production. The results reveal that reburn with DB fuels is an effective technology for NOx emission control when the initial NOx emission is higher than 275 ppm (or 127 g/GJ or 0.3 lb/MMBtu).

Keywords: dairy biomass; animal wastes; renewable energy; reburn; co-firing; combustion; NOx reduction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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