Pollutant control through staged combustion of pulverized coal. Technical progress report, January--December 1977
- Author
- Wendt, J. O. L.
- Published
- United States : [publisher not identified], 1978.
Springfield, Va. : National Technical Information Service, [approximately 1978] - Physical Description
- microfiche : negative ; 11 x 15 cm
- Additional Creators
- Lee, J. W. and Pershing, D. W.
- Summary
- Mechanisms governing the fate of fuel nitrogen during pulverized coal combustion are often controlled by events occurring in a fuel rich environment. This is especially true for staged combustion, which, although known to be effective for NO/sub x/ abatement, still requires its optimum configuration to be determined. The tests reported here constitute a major portion of an in-depth investigation of NO/sub x/ formation mechanisms under fuel rich and staged combustion conditions. Time resolved measurements of NO/sub x/, CO, CO/sub 2/ and O/sub 2/ were obtained in a plane flame 2 kg/h pulverized coal combustor. It was found that at all fuel rich conditions, NO is formed very rapidly and then slowly destroyed, the early peak NO is a strong function of stoichiometric ratio, and consists entirely of fuel NO. Time resolved profiles obtained under staged combustion conditions indicated that ''second stage'' NO was very important at low first stage stoichiometric ratios, that it consisted of fuel NO, and that, surprisingly, it was independent of first stage residence time. At higher but still fuel rich stoichiometric ratios NO was observed both to be formed and to be destroyed at the staging position. The major limitations to increased NO/sub x/ abatement through classical staging were found to arise from (a) the high initial rate of NO formation, (b) the slow rate of NO reduction, and (c) the formation of second stage NO. An advanced staging concept, described herein, was designed to eliminate these limitations and was successful in achieving a 90% NO reduction.
- Report Numbers
- FE-1817-4
- Other Subject(s)
- 01 coal, lignite, and peat
- 010900 - coal, lignite, & peat- environmental aspects
- 014000 - coal, lignite, & peat- combustion
- 500200 - environment, atmospheric- chemicals monitoring & transport- (-1989).
- 54 environmental sciences
- Air pollution abatement
- Bituminous coal
- Black coal
- Burners
- Carbonaceous materials
- Chalcogenides
- Chemical reaction yield
- Chemical reactions
- Coal fines
- Coal
- Combustion
- Cryogenic fluids
- Elements
- Energy sources
- Flames
- Fluids
- Fossil fuels
- Fuels
- Nitric oxide
- Nitrogen compounds
- Nitrogen oxides
- Nitrogen
- Nonmetals
- Oxidation
- Oxides
- Oxygen compounds
- Pollution abatement
- Thermochemical processes
- Yields
- Collection
- NTIS collection.
- Note
- DOE contract number: EX-76-C-01-1817
OSTI Identifier 6943924
Research organization: Arizona Univ., Tucson (USA). Dept. of Chemical Engineering.
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