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Development of Subair Technique for Combustibility Enhancement and NOx Reduction in a Pulverized Coal-Fired Boiler
[Image: see text] In this work, subair injection was proposed to improve the combustibility and NOx emission in a 500 MW tangentially fired coal boiler. The location of injection ports was determined based on the coal particle trajectory and its effect was investigated numerically. The flow rate of...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648506/ https://www.ncbi.nlm.nih.gov/pubmed/31459472 http://dx.doi.org/10.1021/acsomega.8b03405 |
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author | Kim, Kang-Min Ahn, Seok-Gi Kim, Gyu-Bo Jeon, Chung-Hwan |
author_facet | Kim, Kang-Min Ahn, Seok-Gi Kim, Gyu-Bo Jeon, Chung-Hwan |
author_sort | Kim, Kang-Min |
collection | PubMed |
description | [Image: see text] In this work, subair injection was proposed to improve the combustibility and NOx emission in a 500 MW tangentially fired coal boiler. The location of injection ports was determined based on the coal particle trajectory and its effect was investigated numerically. The flow rate of subair was set to 0, 5, and 10% of the total combustion air. The secondary air flow rate was decreased appropriately to ensure that the total quantity of combustion air remained constant. The over-fire air was not adjusted to retain the effect of an air-staged combustion. The simulation results showed that the subair improved the combustibility of coal particles originating from burners A and B in the lower part of the furnace. Particles from other burners were not affected significantly. In addition, this method achieved reduction of NOx by 6.3 and 13.2% when the subair accounted for 5 and 10% of the combustion air, respectively. This reduction was attributed to the decrease in the peak temperature as a result of a wider combustion region. The proposed subair technique improved the coal combustibility and reduced the NOx emissions successfully in the furnace. |
format | Online Article Text |
id | pubmed-6648506 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-66485062019-08-27 Development of Subair Technique for Combustibility Enhancement and NOx Reduction in a Pulverized Coal-Fired Boiler Kim, Kang-Min Ahn, Seok-Gi Kim, Gyu-Bo Jeon, Chung-Hwan ACS Omega [Image: see text] In this work, subair injection was proposed to improve the combustibility and NOx emission in a 500 MW tangentially fired coal boiler. The location of injection ports was determined based on the coal particle trajectory and its effect was investigated numerically. The flow rate of subair was set to 0, 5, and 10% of the total combustion air. The secondary air flow rate was decreased appropriately to ensure that the total quantity of combustion air remained constant. The over-fire air was not adjusted to retain the effect of an air-staged combustion. The simulation results showed that the subair improved the combustibility of coal particles originating from burners A and B in the lower part of the furnace. Particles from other burners were not affected significantly. In addition, this method achieved reduction of NOx by 6.3 and 13.2% when the subair accounted for 5 and 10% of the combustion air, respectively. This reduction was attributed to the decrease in the peak temperature as a result of a wider combustion region. The proposed subair technique improved the coal combustibility and reduced the NOx emissions successfully in the furnace. American Chemical Society 2019-01-30 /pmc/articles/PMC6648506/ /pubmed/31459472 http://dx.doi.org/10.1021/acsomega.8b03405 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Kim, Kang-Min Ahn, Seok-Gi Kim, Gyu-Bo Jeon, Chung-Hwan Development of Subair Technique for Combustibility Enhancement and NOx Reduction in a Pulverized Coal-Fired Boiler |
title | Development of Subair Technique for Combustibility
Enhancement and NOx Reduction
in a Pulverized Coal-Fired Boiler |
title_full | Development of Subair Technique for Combustibility
Enhancement and NOx Reduction
in a Pulverized Coal-Fired Boiler |
title_fullStr | Development of Subair Technique for Combustibility
Enhancement and NOx Reduction
in a Pulverized Coal-Fired Boiler |
title_full_unstemmed | Development of Subair Technique for Combustibility
Enhancement and NOx Reduction
in a Pulverized Coal-Fired Boiler |
title_short | Development of Subair Technique for Combustibility
Enhancement and NOx Reduction
in a Pulverized Coal-Fired Boiler |
title_sort | development of subair technique for combustibility
enhancement and nox reduction
in a pulverized coal-fired boiler |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648506/ https://www.ncbi.nlm.nih.gov/pubmed/31459472 http://dx.doi.org/10.1021/acsomega.8b03405 |
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