Influence of Burner Mass-Flow Rate Bias and Injection Direction Offset on High-Temperature Corrosion and Combustion in a 660-MW Opposed Swirling-Fired Boiler
Publication: Journal of Energy Engineering
Volume 148, Issue 5
Abstract
combustion with deep air staging technology is commonly adopted to reduce emissions in coal-fired power plants. However, introducing deep air staging results in a strong-reducing atmosphere, which may cause high-temperature corrosion on the water-cooled wall. In general, alleviating the reducing atmosphere around the water-cooled wall is undoubtedly the lowest-cost and highest-efficiency technique. This study aims to investigate the influence of burner mass-flow rate bias and injection direction offset on high-temperature corrosion and combustion in a 660 MWe opposed wall-fired boiler. The results show that decreasing the load of burners close to the sidewalls can not only reduce the high-temperature zone and the CO and concentrations near the sidewalls but also improve combustion characteristics by controlling emissions. Taking the high-temperature corrosion, combustion, and emissions into account, it is recommended to decrease the load of burners close to the sidewalls by 10%. In addition, as the burner injection direction offset increases from 0° to 7°, the high-temperature zone near the sidewalls enlarges slightly, but as the burner injection direction offset further increases from 7° to 10°, the high-temperature zone near the sidewalls increases significantly. Considering the high-temperature corrosion, combustion and emissions, 7° may be the optimal value of the burner injection direction offset angle and is applied to the actual retrofit. The actual industrial application shows that compared to that before the retrofit, the temperatures near the sidewalls change slightly after the retrofit, but the CO concentrations significantly decrease and the boiler efficiency increases from approximately 93.27% to 93.46%. After a long period of operation, good performance without high-temperature corrosion of the sidewalls is achieved.
Get full access to this article
View all available purchase options and get full access to this article.
Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was sponsored by National Key R&D Program of China (No. 2017YFB0601805).
References
Cheng, P. 1964. “Two-dimensional radiating gas flow by a moment method.” AIAA J. 2 (9): 1662–1664. https://doi.org/10.2514/3.2645.
Desoete, G. G. 1975. “Overall reaction rates of NO and formation from fuel nitrogen, Fifteenth Symposium (International) on Combustion.” Combust. Inst. 15 (1): 991–1195. https://doi.org/10.1016/S0082-0784(75)80374-2.
Gada, H., D. Mudgal, and S. Parvez. 2020. “Investigation of high temperature corrosion resistance of Ni25Cr coated and bare 347H SS in actual husk fired boiler atmosphere.” Eng. Fail. Anal. 108 (Jan): 104256. https://doi.org/10.1016/j.engfailanal.2019.104256.
Gosman, A. D., and E. Ioannides. 1983. “Aspects of computer simulation of liquid-fueled combustors.” J. Energy 7 (6): 482–490. https://doi.org/10.2514/3.62687.
Hernik, B. 2015. “Numerical calculations of the WR-40 boiler with a furnace jet boiler system.” Energy 92 (Dec): 54–66. https://doi.org/10.1016/j.energy.2015.05.137.
Hernik, B., G. Latacz, and D. Znamirowski. 2016. “A numerical study on the combustion process for various configurations of burners in the novel ultra-supercritical BP-680 boiler furnace chamber.” Fuel Process. Technol. 152 (Nov): 381–389. https://doi.org/10.1016/j.fuproc.2016.06.038.
Hill, S. C., and L. D. Smoot. 2000. “Modelling of nitrogen oxides formation and destruction in combustion systems.” Prog. Energy Combust. Sci. 26 (4–6): 417–458. https://doi.org/10.1016/S0360-1285(00)00011-3.
Hu, Y. K., H. L. Li, and J. Y. Yan. 2014. “Numerical investigation of heat transfer characteristics in utility boilers of oxy-coal combustion.” Appl. Energy 130 (Oct): 543–551. https://doi.org/10.1016/j.apenergy.2014.03.038.
Hussain, T., A. U. Syed, and N. J. Simms. 2013. “Trends in fireside corrosion damage to superheaters in air and oxy-firing of coal/biomass.” Fuel 113 (Nov): 787–797. https://doi.org/10.1016/j.fuel.2013.04.005.
Jin, Q. M., G. F. Dai, and Y. B. Wang. 2020. “High-temperature corrosion of water-wall tubes in oxy-combustion atmosphere.” J. Energy Inst. 93 (4): 1305–1312. https://doi.org/10.1016/j.joei.2019.11.013.
Kawahara, Y. 2007. “Application of high temperature corrosion-resistant materials and coatings under severe corrosive environment in waste-to-energy boilers.” J. Therm. Spray Technol. 16 (2): 202–213. https://doi.org/10.1007/s11666-006-9012-5.
Kramlich, J. C. 1980. “Fate and behavior of fuel-sulfur in combustion system.” Diploma thesis, Dept. of Mechanical Engineering, Washington State Univ.
Liu, H., S. J. Hu, and L. Zhang. 2019. “Influence of near-wall air position on the high-temperature corrosion and combustion in a 1000 MWth opposed wall-fired boiler.” Fuel 257 (Dec): 115983. https://doi.org/10.1016/j.fuel.2019.115983.
Ma, H. H., L. Zhou, and S. X. Ma. 2018a. “Impact of multi-hole-wall air coupling with air-staged technology on H2S evolution during pulverized coal combustion.” Fuel Process. Technol. 179 (Oct): 277–284. https://doi.org/10.1016/j.fuproc.2018.07.016.
Ma, H. H., L. Zhou, and S. X. Ma. 2018b. “Reaction mechanism for sulfur species during pulverized coal combustion.” Energy Fuels 32 (3): 3958–3966. https://doi.org/10.1021/acs.energyfuels.7b03868.
Ma, L., Q. Y. Fang, D. Z. Lv, C. Zhang, Y. Chen, G. Chen, X. Duan, and X. Wang. 2015. “Reducing NOx emissions for a 600 MWe down-fired pulverized-coal utility boiler by applying a novel combustion system.” Environ. Sci. Technol. 49 (21): 13040–13049. https://doi.org/10.1021/acs.est.5b02827.
Ma, L., Q. Y. Fang, C. G. Yin, H. Wang, C. Zhang, and G. Chen. 2019a. “A novel corner-fired boiler system of improved efficiency and coal flexibility and reduced NOx emissions.” Appl. Energy 238 (Mar): 453–465. https://doi.org/10.1016/j.apenergy.2019.01.084.
Ma, L., Q. Y. Fang, C. G. Yin, L. Zhong, C. Zhang, and G. Chen. 2019b. “More efficient and environmentally friendly combustion of low-rank coal in a down-fired boiler by a simple but effective optimization of staged-air wind-box.” Fuel Process. Technol. 194 (Nov): 106118. https://doi.org/10.1016/j.fuproc.2019.06.002.
Ma, L., S. H. Yu, and Q. Y. Fang. 2020. “Effect of separated over-fire air angle on combustion and NOx emissions in a down-fired utility boiler with a novel combustion system.” Process Saf. Environ. 138 (Jun): 57–66. https://doi.org/10.1016/j.psep.2020.03.005.
Qian, G., C. Che, and X. F. Qian. 2015. “Analysis on high-temperature corrosion of water wall tubes in a supercritical boiler.” [In Chinese.] China Spec. Equip. Saf. 31: 59–64. https://doi.org/10.3969/j.issn.1673-257X.2015.Z1.013.
Sheng, C. D., B. Moghtaderi, R. Gupta, and T. F. Wall. 2004. “A computational fluid dynamics based study of the combustion characteristics of coal blends in pulverized coal-fired furnace.” Fuel 83 (11–12): 1543–1552. https://doi.org/10.1016/j.fuel.2004.02.011.
Shih, T. H., W. W. Liou, A. Shabbir, Z. Yang, and J. Zhu. 1995. “A new k- eddy viscosity model for high reynolds number turbulent flows.” Comput. Fluids 24 (3): 227–238. https://doi.org/10.1016/0045-7930(94)00032-T.
Shim, H. S., J. R. Valentine, and K. Davis. 2008. “Development of fireside waterwall corrosion correlations using pilot-scale test furnace.” Fuel 87 (15–16): 3353–3361. https://doi.org/10.1016/j.fuel.2008.05.016.
Smoot, L. D., and P. J. Smith. 1985. Coal combustion and gasification. New York: Plenum Press.
Ti, S. G., M. Kuang, and H. P. Wang. 2020. “Experimental combustion characteristics and NOx emissions at 50% of the full load for a 600-MWe utility boiler: Effects of the coal feed rate for various mills.” Energy 196 (Apr): 117128. https://doi.org/10.1016/j.energy.2020.117128.
Wang, Y., and Y. Zhou. 2020. “Numerical optimization of the influence of multiple deep air-staged combustion on the NOx emission in an opposed firing utility boiler using lean coal.” Fuel 269 (Jun): 116996. https://doi.org/10.1016/j.fuel.2019.116996.
Xiong, X. H., X. Liu, and H. Z. Tan. 2020. “Investigation on high temperature corrosion of water-cooled wall tubes at a 300 MW boiler.” J. Energy Inst. 93 (1): 377–386. https://doi.org/10.1016/j.joei.2019.02.003.
Xu, L. G., Y. J. Huang, and L. Zou. 2019. “Experimental research of mitigation strategy for high-temperature corrosion of waterwall fireside in a 630 MWe tangentially fired utility boiler based on combustion adjustments.” Fuel Process. Technol. 188 (Jun): 1–15. https://doi.org/10.1016/j.fuproc.2019.02.001.
Yang, W., B. Wang, and S. Lei. 2019. “Combustion optimization and NOx reduction of a 600 MWe down-fired boiler by rearrangement of swirl burner and introduction of separated over-fire air.” J. Cleaner Prod. 210 (Feb): 1120–1130. https://doi.org/10.1016/j.jclepro.2018.11.077.
Yang, W., R. You, and Z. Wang. 2017. “Effects of near-wall air application in a pulverized-coal 300 MW utility boiler on combustion and corrosive gases.” Energy Fuels 31 (9): 10075–10081. https://doi.org/10.1021/acs.energyfuels.7b01476.
Yin, C. G. 2015. “On gas and particle radiation in pulverized fuel combustion furnaces.” Appl. Energy 157 (Nov): 554–561. https://doi.org/10.1016/j.apenergy.2015.01.142.
Zhang, Z., Z. Li, and N. Cai. 2016. “Formation of reductive and corrosive gases during air-staged combustion of blends of anthracite/sub-bituminous coals.” Energy Fuels 30 (5): 4353–4362. https://doi.org/10.1021/acs.energyfuels.6b00599.
Zhao, Q. X., Z. X. Zhang, and D. N. Cheng. 2012. “High temperature corrosion of water wall materials T23 and T24 in simulated furnace atmospheres (in Chinese).” Chin. J. Chem. Eng. 20 (4): 814–822. https://doi.org/10.1016/S1004-9541(11)60252-8.
Zhou, L. X. 1993. Theory and numerical modeling of turbulent gas-particle flows and combustion. Boca Raton, FL: CRC Press.
Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 148 • Issue 5 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 17, 2021
Accepted: Apr 8, 2022
Published online: Jun 24, 2022
Published in print: Oct 1, 2022
Discussion open until: Nov 24, 2022
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.
Cited by
- Qiang Lyu, Chang’an Wang, Pengbo Zhao, Lei Zhou, Yujie Hou, Meijing Chen, Yongbo Du, Defu Che, Numerical Study on Coal–Sludge Cocombustion Characteristics and Emission Behaviors in a 330-MW Wall-Fired Boiler, Journal of Energy Engineering, 10.1061/JLEED9.EYENG-4856, 149, 5, (2023).