Task 3.15 -- Impacts of low-NOx combustion on fly ash and slagging. Semi-annual report, July 1--December 31, 1996
Abstract
With the advent of the Clean Air Act Amendments of 1990, the coal-fired power industry began a more accelerated move toward using low-NOx burner (LNB) technologies to reduce NOx emissions. Most LNBs incorporate less oxygen with the coal initially, creating a cooler and somewhat substoichiometric initial combustion zone, with additional oxygen added further on in the combustion process to complete char combustion. Another method used to achieve lower NOx emissions is to fire the coal substoichiometrically and add additional air through overfire air ports. Both of these methods create certain impacts on fireside performance that are different from conventional high-excess-air firing arrangements. Some of the impacts that have been noticed by the utility industry are higher levels of unburned carbon in the fly ash and bottom ash, increased boiler tube corrosion, higher particulate loadings on control devices, and changes in slagging in the main furnace. Work on the fundamental mechanisms of entrained ash and ash deposit formation during low-NOx combustion has been sparse. This project by the Energy and Environmental Research Center (EERC) focuses on the issues of entrained ash formation and slagging for low-NOx combustion systems in general. Time-resolved combustion tests under conventional and low-NOx conditions have been conductedmore »
- Authors:
- Publication Date:
- Research Org.:
- North Dakota Univ., Energy and Environmental Research Center, Grand Forks, ND (United States)
- Sponsoring Org.:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- OSTI Identifier:
- 634174
- Report Number(s):
- DOE/MC/30097-5587
ON: DE97002234; TRN: AHC2DT01%%185
- DOE Contract Number:
- FC21-93MC30097
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: Aug 1997
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 01 COAL, LIGNITE, AND PEAT; PROGRESS REPORT; FLY ASH; SLAGS; NITROGEN OXIDES; AIR POLLUTION ABATEMENT; FOULING; PARTICLE SIZE; CHEMICAL COMPOSITION; PERFORMANCE TESTING; BOILERS
Citation Formats
Zygarlicke, C.J., and McCollor, D.P. Task 3.15 -- Impacts of low-NOx combustion on fly ash and slagging. Semi-annual report, July 1--December 31, 1996. United States: N. p., 1997.
Web. doi:10.2172/634174.
Zygarlicke, C.J., & McCollor, D.P. Task 3.15 -- Impacts of low-NOx combustion on fly ash and slagging. Semi-annual report, July 1--December 31, 1996. United States. doi:10.2172/634174.
Zygarlicke, C.J., and McCollor, D.P. Fri .
"Task 3.15 -- Impacts of low-NOx combustion on fly ash and slagging. Semi-annual report, July 1--December 31, 1996". United States.
doi:10.2172/634174. https://www.osti.gov/servlets/purl/634174.
@article{osti_634174,
title = {Task 3.15 -- Impacts of low-NOx combustion on fly ash and slagging. Semi-annual report, July 1--December 31, 1996},
author = {Zygarlicke, C.J. and McCollor, D.P.},
abstractNote = {With the advent of the Clean Air Act Amendments of 1990, the coal-fired power industry began a more accelerated move toward using low-NOx burner (LNB) technologies to reduce NOx emissions. Most LNBs incorporate less oxygen with the coal initially, creating a cooler and somewhat substoichiometric initial combustion zone, with additional oxygen added further on in the combustion process to complete char combustion. Another method used to achieve lower NOx emissions is to fire the coal substoichiometrically and add additional air through overfire air ports. Both of these methods create certain impacts on fireside performance that are different from conventional high-excess-air firing arrangements. Some of the impacts that have been noticed by the utility industry are higher levels of unburned carbon in the fly ash and bottom ash, increased boiler tube corrosion, higher particulate loadings on control devices, and changes in slagging in the main furnace. Work on the fundamental mechanisms of entrained ash and ash deposit formation during low-NOx combustion has been sparse. This project by the Energy and Environmental Research Center (EERC) focuses on the issues of entrained ash formation and slagging for low-NOx combustion systems in general. Time-resolved combustion tests under conventional and low-NOx conditions have been conducted to note particle-size formation and slagging deposition. The results from this work are yielding an increased understanding of the mechanisms of ash formation during low-NOx combustion along with methods for enhancing heat transfer and fly ash collectability. Specific objectives of this research project include (1) determining whether initial char and ash generated under low-NOx conditions have greater tendencies for slagging than conventionally generated ash and (2) determining the differences, if any, between particle size and composition for entrained ash generated under low-NOx and conventional combustion conditions.},
doi = {10.2172/634174},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 1997},
month = {Fri Aug 01 00:00:00 EDT 1997}
}
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Task 3.15 -- Impacts of low-NO{sub x} combustion on fly ash and slagging
This project by the Energy and Environmental Research Center (EERC) focuses on the issues of entrained-ash formation and slagging for low-NO{sub x} combustion systems in general. Time-resolved combustion tests under conventional and low-NO{sub x} conditions have been conducted to note particle-size formation and slagging deposition. Results will be used to support demonstration projects at the utility boiler scale. The results from this work are yielding an increased understanding of the mechanisms of ash formation during low-NO{sub x} combustion along with methods for enhancing heat transfer and fly ash collectibility. Specific objectives of this research project include (1) determining whether initialmore » -
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Task 7.1 - Strategic Planning: Semi-annual report, July 1- December 31, 1996.
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