Optimized Fuel Injector Design for Maximum In-Furnace N0x Reduction and Minimum Unburned Carbon

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Coal burners/injectors are an integral part of PC-fired facilities and their design plays a crucial role in many of the most cost-effective NO{sub x} control strategies (staged low NO{sub x} burners, reburning, or hybrid approaches such as reburning and SNCR). The effort described in this presentation/paper involves two of these techniques, low NO{sub x} burners and reburning, and focuses on the role of the solids, in particular, the impact of heterogeneous chemistry and two-phase mixing on NO{sub x} formation/reduction and carbon conversion. The inter-related roles of fluid mechanics and char reactivity have been evaluated experimentally and computationally in an effort ... continued below

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3 p.; Other: FDE: PDF; PL:

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Harding, S.; Davis, K. & Valentine, J. July 1, 1997.

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Description

Coal burners/injectors are an integral part of PC-fired facilities and their design plays a crucial role in many of the most cost-effective NO{sub x} control strategies (staged low NO{sub x} burners, reburning, or hybrid approaches such as reburning and SNCR). The effort described in this presentation/paper involves two of these techniques, low NO{sub x} burners and reburning, and focuses on the role of the solids, in particular, the impact of heterogeneous chemistry and two-phase mixing on NO{sub x} formation/reduction and carbon conversion. The inter-related roles of fluid mechanics and char reactivity have been evaluated experimentally and computationally in an effort to understand their effects on NO{sub x} formation/destruction and carbon burnout. Experiments will be discussed that describe chemistry and mixing phenomena relevant to both coal-fired burners and reburning. In addition, simulations focusing on similar issues in a still-scale boiler environment have been performed using simple and advanced models of char oxidation developed during the course of the program. These results provide insight into the importance of heterogeneous NO{sub x} formation/reduction mechanisms and the importance of the interaction between char reactivity and the temperature/oxygen-concentration history of coal particles. In addition, burner and particle size specific sources of carbon-in-ash can be identified.

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3 p.; Other: FDE: PDF; PL:

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OSTI as DE98051623

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  • Advanced coal-based power and environmental systems `97 conference, Pittsburgh, PA (United States), 22-24 Jul 1997

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  • Other: DE98051623
  • Report No.: DOE/PC/95103--98/C0925
  • Report No.: CONF-970772--
  • Grant Number: AC22-95PC95103
  • Office of Scientific & Technical Information Report Number: 620968
  • Archival Resource Key: ark:/67531/metadc694797

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 11, 2015, 1:09 p.m.

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Harding, S.; Davis, K. & Valentine, J. Optimized Fuel Injector Design for Maximum In-Furnace N0x Reduction and Minimum Unburned Carbon, article, July 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc694797/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.