Investigation of mineral transformation and ash deposition during staged combustion. Final report, October 1, 1993--September 30, 1997

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The purpose of this report is to document a recently completed four-year study to examine the impact of low-NOx firing technologies on ash formation and deposition while firing pulverized coal. Low-NOx burners and staged combustion inhibit NOx formation by restricting the amount of oxygen available to form a fuel-rich zone in which nitrogen compounds are reduced to molecular nitrogen (N{sub 2}) rather than oxidized. Additional oxygen is provided downstream for complete combustion. Consequently, coal and mineral particles encounter different temperatures and oxygen concentrations when they are burned under low-NOx firing conditions than they do in conventionally-fired units. Two coals with ... continued below

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102 p.

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Harb, J.N. December 31, 1997.

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Description

The purpose of this report is to document a recently completed four-year study to examine the impact of low-NOx firing technologies on ash formation and deposition while firing pulverized coal. Low-NOx burners and staged combustion inhibit NOx formation by restricting the amount of oxygen available to form a fuel-rich zone in which nitrogen compounds are reduced to molecular nitrogen (N{sub 2}) rather than oxidized. Additional oxygen is provided downstream for complete combustion. Consequently, coal and mineral particles encounter different temperatures and oxygen concentrations when they are burned under low-NOx firing conditions than they do in conventionally-fired units. Two coals with distinctly different inorganic contents and ash characteristics were fired in a pilot-scale laboratory combustor under both conventional and staged combustion conditions. Ash and deposit samples were collected at various locations in the reactor and analyzed in order to assess the influence of staged combustion. This report is organized as follows. First, a background section provides the foundation needed in order to understand the motivation for and the results of the experimental program. The next section presents a description of the experimental apparatus and procedures, including the development the analytical methods critical to the study. Results of the analyses of coal, ash and deposit samples are then presented and discussed for each of the two coals. Finally, the report ends with a short summary and statement of conclusions.

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102 p.

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OSTI as DE98054191

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  • Other Information: PBD: [1997]

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  • Other: DE98054191
  • Report No.: DOE/PC/93226--99
  • Grant Number: FG22-93PC93226
  • DOI: 10.2172/629351 | External Link
  • Office of Scientific & Technical Information Report Number: 629351
  • Archival Resource Key: ark:/67531/metadc693884

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 31, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 10, 2015, 7:56 p.m.

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Harb, J.N. Investigation of mineral transformation and ash deposition during staged combustion. Final report, October 1, 1993--September 30, 1997, report, December 31, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc693884/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.