Effect of slot wall jet on combustion process in a 660 MW opposed wall fired pulverized coal boiler

Zhang, Y, Fang, Y, Jin, B, Zhang, Y, Zhou, C and Sher, F ORCID: https://orcid.org/0000-0003-2890-5912, 2019. Effect of slot wall jet on combustion process in a 660 MW opposed wall fired pulverized coal boiler. International Journal of Chemical Reactor Engineering, 17 (4): 20180110. ISSN 1542-6580

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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.

Item Type:	Journal article
Publication Title:	International Journal of Chemical Reactor Engineering
Creators:	Zhang, Y., Fang, Y., Jin, B., Zhang, Y., Zhou, C. and Sher, F.
Publisher:	Walter de Gruyter GmbH
Date:	14 February 2019
Volume:	17
Number:	4
ISSN:	1542-6580
Identifiers:	Number Type 10.1515/ijcre-2018-0110 DOI 1568218 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	27 Jul 2022 12:38
Last Modified:	27 Jul 2022 12:38
URI:	https://irep.ntu.ac.uk/id/eprint/46749

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