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FEEDLOT MANURE AS REBURN FUEL FOR NOX REDUCTION IN COAL FIRED PLANTS
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 203-214 in Air Pollution from Agricultural Operations III, Proceedings of the 12-15 October 2003 Conference (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1403.(doi:10.13031/2013.15513)
Authors: K. Annamalai, B. Thien, J. Sweeten, K. Heflin, and L. W. Greene
Keywords: Feedlot manure, Coal, NO, Power, Reburn fuel, Fuel properties
Reburn technology is used in power plants in order to comply with NOx emission levels in existing coal fired power plants. While the main fuel coal supplies almost 80-90% of power (% by heat), additional fuel, called reburn fuel and supplying the remaining power, is fired in a secondary combustion chamber to control the NOx. This reburn fuel is typically natural gas. However, recent small scale tests at a 30 kW (100,000 BTU/hr) boiler burner facility co-firing coal with feedlot manure (“feedlot biomass”, FB) suggested that FB can serve as a more effective reburn fuel than natural gas. The boiler burner facility used was modified to fire premixed propane fuel with ammonia injection in order to simulate NOx in the exhaust from coal-fired units. Experiments were performed with coal or FB as reburn fuels in order to determine the relative performance. The FB is partially composted, ground manure from a cattle feedlot in the Texas High Plains. Results indicated NOX reduction with FB is almost 80 % while that of coal was only about 40 %. Further, the % NOx reduction was less sensitive to stoichiometry compared to coal. Thus, a reburn technology with FB as the reburn fuel may reduce NOx emissions while providing a utilization method for FB. It is speculated that most of the N in FB exists as NH3, and volatile matter of FB (little fixed carbon) is twice that of coal and hence FB serves as a better reburn fuel in controlling the NOx emission. Since FB fuel for co-firing or reburn normally contains high P and high ash, cattle feeding trials were conducted to produce FB with low ash/low P content as well. Co-fire test results were reported for low P-FB, but reburn results with low P-FB are not yet available.
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