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Effect of inner and outer secondary air ratios on ignition, C and N conversion process of pulverized coal in swirl burner under sub-stoichiometric ratio

Author

Listed:
  • Chen, Zhichao
  • Qiao, Yanyu
  • Guan, Shuo
  • Wang, Zhenwang
  • Zheng, Yu
  • Zeng, Lingyan
  • Li, Zhengqi

Abstract

This study proposes changing the inner and outer secondary air ratios (RSA) under sub-stoichiometric (sub-SR) conditions to optimize the burn-out performance and reduce the NOx emissions of a swirl burner. The ignition and combustion characteristics, NOx formation, and the effect of RSA on the carbon and nitrogen conversion processes under sub-SR (SR = 0.85) were investigated via thermal tests carried out in a 0.5 MWe pulverized coal-fired furnace. The fuel-rich flow in the center of the furnace was further rearward than the fuel-lean flow. The pulverized coal burnt rapidly after entering the furnace. The average percentage of unburned carbon was less than 15% in the x/d = 3.5 (x is the axial direction distance, and d is the diameter of the burner) section away from the burner. The N to NO conversion at the beginning of combustion (x/d < 3.5) was effectively suppressed in the swirl burner under sub-SR conditions. The NO reduction reaction almost completely stopped after x/d > 11.5. RSA mainly affected the combustion characteristics and NOx generation characteristics of pulverized coal by changing the degree of air staging at different positions in the furnace. Larger RSA values meant a greater amount of oxygen involved in the early combustion. This accelerated the early burn-out of pulverized coal and the release of elements, increasing NOx emissions. This study recommends RSA values between 0.7 and 1, that the over-fire air (OFA) nozzle be positioned behind the near burner region (x/d > 3.5) for the combustion of bituminous coal to minimize NOx emissions and unburned carbon.

Suggested Citation

  • Chen, Zhichao & Qiao, Yanyu & Guan, Shuo & Wang, Zhenwang & Zheng, Yu & Zeng, Lingyan & Li, Zhengqi, 2022. "Effect of inner and outer secondary air ratios on ignition, C and N conversion process of pulverized coal in swirl burner under sub-stoichiometric ratio," Energy, Elsevier, vol. 239(PD).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pd:s0360544221026724
    DOI: 10.1016/j.energy.2021.122423
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    1. Choi, Minsung & Park, Yeseul & Li, Xinzhuo & Kim, Kibeom & Sung, Yonmo & Hwang, Taegam & Choi, Gyungmin, 2021. "Numerical evaluation of pulverized coal swirling flames and NOx emissions in a coal-fired boiler: Effects of co- and counter-swirling flames and coal injection modes," Energy, Elsevier, vol. 217(C).
    2. Ti, Shuguang & Kuang, Min & Wang, Haopeng & Xu, Guangyin & Niu, Cong & Liu, Yannan & Wang, Zhenfeng, 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, Elsevier, vol. 196(C).
    3. Wang, Pengqian & Wang, Chang'an & Yuan, Maobo & Wang, Chaowei & Zhang, Jinping & Du, Yongbo & Tao, Zichen & Che, Defu, 2020. "Experimental evaluation on co-combustion characteristics of semi-coke and coal under enhanced high-temperature and strong-reducing atmosphere," Applied Energy, Elsevier, vol. 260(C).
    4. Wang, Qingxiang & Chen, Zhichao & Wang, Jiaquan & Zeng, Lingyan & Zhang, Xin & Li, Xiaoguang & Li, Zhengqi, 2018. "Effects of secondary air distribution in primary combustion zone on combustion and NOx emissions of a large-scale down-fired boiler with air staging," Energy, Elsevier, vol. 165(PB), pages 399-410.
    5. Karasu, Seçkin & Altan, Aytaç & Bekiros, Stelios & Ahmad, Wasim, 2020. "A new forecasting model with wrapper-based feature selection approach using multi-objective optimization technique for chaotic crude oil time series," Energy, Elsevier, vol. 212(C).
    6. Ti, Shuguang & Chen, Zhichao & Li, Zhengqi & Xie, Yiquan & Shao, Yunlin & Zong, Qiudong & Zhang, Qinghua & Zhang, Hao & Zeng, Lingyan & Zhu, Qunyi, 2014. "Influence of different swirl vane angles of over fire air on flow and combustion characteristics and NOx emissions in a 600 MWe utility boiler," Energy, Elsevier, vol. 74(C), pages 775-787.
    7. Chen, Zhichao & Wang, Qingxiang & Zhang, Xiaoyan & Zeng, Lingyan & Zhang, Xin & He, Tao & Liu, Tao & Li, Zhengqi, 2017. "Industrial-scale investigations of anthracite combustion characteristics and NOx emissions in a retrofitted 300 MWe down-fired utility boiler with swirl burners," Applied Energy, Elsevier, vol. 202(C), pages 169-177.
    8. Xu, Mingxin & Li, Shiyuan & Wu, Yinghai & Jia, Lufei, 2017. "Reduction of recycled NO over char during oxy-fuel fluidized bed combustion: Effects of operating parameters," Applied Energy, Elsevier, vol. 199(C), pages 310-322.
    9. Wang, Qingxiang & Chen, Zhichao & Wang, Liang & Zeng, Lingyan & Li, Zhengqi, 2018. "Application of eccentric-swirl-secondary-air combustion technology for high-efficiency and low-NOx performance on a large-scale down-fired boiler with swirl burners," Applied Energy, Elsevier, vol. 223(C), pages 358-368.
    10. Li, Shiyuan & Xu, Mingxin & Jia, Lufei & Tan, Li & Lu, Qinggang, 2016. "Influence of operating parameters on N2O emission in O2/CO2 combustion with high oxygen concentration in circulating fluidized bed," Applied Energy, Elsevier, vol. 173(C), pages 197-209.
    11. Wang, Qingxiang & Chen, Zhichao & Che, Miaomiao & Zeng, Lingyan & Li, Zhengqi & Song, Minhang, 2016. "Effect of different inner secondary-air vane angles on combustion characteristics of primary combustion zone for a down-fired 300-MWe utility boiler with overfire air," Applied Energy, Elsevier, vol. 182(C), pages 29-38.
    12. Ti, Shuguang & Chen, Zhichao & Li, Zhengqi & Kuang, Min & Xu, Guangyin & Lai, Jinping & Wang, Zhenfeng, 2018. "Influence of primary air cone length on combustion characteristics and NOx emissions of a swirl burner from a 0.5 MW pulverized coal-fired furnace with air staging," Applied Energy, Elsevier, vol. 211(C), pages 1179-1189.
    13. Zeng, Guang & Xu, Mingchen & Tu, Yaojie & Li, Zhenwei & Cai, Yongtie & Zheng, Zhimin & Tay, Kunlin & Yang, Wenming, 2020. "Influences of initial coal concentration on ignition behaviors of low-NOx bias combustion technology," Applied Energy, Elsevier, vol. 278(C).
    14. Chen, Zhichao & Wang, Zhenwang & Li, Zhengqi & Xie, Yiquan & Ti, Shuguang & Zhu, Qunyi, 2014. "Experimental investigation into pulverized-coal combustion performance and NO formation using sub-stoichiometric ratios," Energy, Elsevier, vol. 73(C), pages 844-855.
    15. Chen, Zhichao & Li, Zhengqi & Zhu, Qunyi & Jing, Jianping, 2011. "Gas/particle flow and combustion characteristics and NOx emissions of a new swirl coal burner," Energy, Elsevier, vol. 36(2), pages 709-723.
    16. Yuan, Maobo & Wang, Chang’an & Zhao, Lin & Wang, Pengqian & Wang, Chaowei & Che, Defu, 2020. "Experimental and kinetics study of NO heterogeneous reduction by the blends of pyrolyzed and gasified semi-coke," Energy, Elsevier, vol. 207(C).
    17. Xu, Mingxin & Li, Shiyuan & Wu, Yinghai & Jia, Lufei & Lu, Qinggang, 2017. "The characteristics of recycled NO reduction over char during oxy-fuel fluidized bed combustion," Applied Energy, Elsevier, vol. 190(C), pages 553-562.
    18. Jing, Jianping & Li, Zhengqi & Zhu, Qunyi & Chen, Zhichao & Ren, Feng, 2011. "Influence of primary air ratio on flow and combustion characteristics and NOx emissions of a new swirl coal burner," Energy, Elsevier, vol. 36(2), pages 1206-1213.
    19. Li, Shiyuan & Li, Haoyu & Li, Wei & Xu, Mingxin & Eddings, Eric G. & Ren, Qiangqiang & Lu, Qinggang, 2017. "Coal combustion emission and ash formation characteristics at high oxygen concentration in a 1MWth pilot-scale oxy-fuel circulating fluidized bed," Applied Energy, Elsevier, vol. 197(C), pages 203-211.
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    2. Deore, Sujeetkumar P. & Gadkari, Prabodh & Mahajani, Sanjay M. & Kumar, Sandeep & Kumar, Sudarshan, 2023. "Development of a new premixed burner for biomass gasifier generated low calorific value producer gas for industrial applications," Energy, Elsevier, vol. 279(C).

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