Effect of Slot Wall Jet on Combustion Process in a 660 MW Opposed Wall Fired Pulverized Coal Boiler

Yong Zhang, Yao Fang, Baosheng Jin, Youwei Zhang, Chunlei Zhou, Farooq Sher

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14 Citations (Scopus)
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Abstract

Numerical investigations of an anti-corrosion design and the combustion process (original conditions and optimal conditions) were conducted for a 660 MW opposed wall fired boiler. In order to solve high-temperature corrosion of the side wall, a scheme was proposed: slotting in the side wall and introducing air (closing-to-wall air) from the secondary air. The effect of anti-corrosion was disclosed in detail by varying the structures of slotting, gas velocities from nozzles and jet inclination angles. The temperature and NOx distribution in the furnace at optimized conditions were compared with those at the original operating conditions. Simulation results showed that the structures of the slot and gas velocities from the nozzles had a marked effect on anti-corrosion of the side wall. When the gas velocity was 4 m/s, an inclination angle of the gas velocity was not conducive to anti-corrosion of the side wall. When the gas velocity increased at the middle and bottom of the side wall, the anti-corrosion effect increased significantly. When the optimal scheme was adopted, the corrosion area of the side wall decreased obviously, but the furnace temperature and the NOx emission increased slightly. The detailed results of this work promote a full understanding of closing-to-wall air and could help to reduce the corrosive area in pulverized-coal furnaces or boilers.

Original languageEnglish
Article number20180110
JournalInternational Journal of Chemical Reactor Engineering
Volume17
Issue number4
Early online date14 Feb 2019
DOIs
Publication statusPublished - Apr 2019
Externally publishedYes

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Keywords

  • closing-to-wall air and NOx emissions
  • coal combustion
  • high-temperature corrosion
  • pulverized coal boiler
  • slotting

ASJC Scopus subject areas

  • Chemical Engineering(all)

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