Effect of staged-air box structure on combustion and NOx emissions from a 300 MWe downshot-fired utility boiler

Lun Ma, Qingyan Fang, Chungen Yin, Bin Yao, Cheng Zhang, Gang Chen

Research output: Contribution to conference without publisher/journalPaper without publisher/journalResearchpeer-review

Abstract

Downshot-firing systems are widely used to burn coals with low volatile matter content, but often reported to have operational problems. This paper comprehensively investigates the effect of the staged-air box structure on the performance of a 300 MWe downshot-fired utility boiler.
First, testing and modelling are done on a 1:1-scaled model of the staged-air box to study the cold flow under one original and two new windbox structures, which sheds light on the proper use of a new staged-air box in the boiler. Then, simulations are performed for the utility boiler
to further investigate the influence of the new staged-air boxes on the boiler performance. Finally, the utility boiler is retrofitted by using one of the newly designed staged-air box. Performance tests are made for the boiler before and after the retrofit, showing the use of the new staged-air box greatly improves the boiler performance at full load, e.g., NOx reduction by 20.7% and thermal efficiency improvement from 88.76% to 90.48%.
Original languageEnglish
Publication dateOct 2018
Number of pages11
Publication statusPublished - Oct 2018
Event13th Conference on Sustainable Development of Energy, Water and Environment Systems (ISSN 1847-7178) - Palermo, Italy
Duration: 30 Sep 20184 Oct 2018
http://www.palermo2018.sdewes.org/

Conference

Conference13th Conference on Sustainable Development of Energy, Water and Environment Systems (ISSN 1847-7178)
Country/TerritoryItaly
CityPalermo
Period30/09/201804/10/2018
Internet address

Keywords

  • Downshot-fired boiler
  • staged-air box
  • aerodynamic field
  • thermal efficiency
  • NOx emission

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