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Influence of inner and outer secondary air ratio on flow and combustion characteristics of a swirl burner in a 29 MW pulverized coal boiler

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  • Yan, Rong
  • Chen, Zhichao
  • Zheng, Yu
  • Yuan, Linxuan
  • Zeng, Lingyan
  • Li, Zhengqi

Abstract

In this study, a novel swirl burner for industrial pulverized coal boiler was studied by laboratory experiments and industrial application tests. First, a cold flow experiment was carried out on a 1:3 scale model experimental platform. The cold air velocities of burner outlet were measured in detail. Moreover, the influence of the mass flow ratio of the inner and outer secondary air on the shape of the central reflux zone and the reflux rate at the burner outlet was analyzed. It was found that a stable central reflux zone can be formed at the burner outlet. In addition, an industry application test was carried out in a 29 MW hot water boiler. The flue gas temperature at the burner outlet and the composition of exhaust gas were obtained under different operating parameters. The influence of inner and outer secondary air damper opening on burner performance (ignition performance, NOx emission characteristics, stable combustion performance, and anti-slagging performance) was analyzed. The influence of inner secondary air damper opening on burner performance was found to be greater than that of outer secondary air damper opening. The maximum concentration of NOx emission at furnace outlet was 364.9 mg/m3, and low-NOx combustion was achieved for industrial pulverized coal boilers. The minimum load without natural gas support was 3 MW. The load regulation rate was close to 10:1, and low load combustion stability was achieved. During three heating seasons, the normal operation of the boiler was not affected by slagging.

Suggested Citation

  • Yan, Rong & Chen, Zhichao & Zheng, Yu & Yuan, Linxuan & Zeng, Lingyan & Li, Zhengqi, 2021. "Influence of inner and outer secondary air ratio on flow and combustion characteristics of a swirl burner in a 29 MW pulverized coal boiler," Energy, Elsevier, vol. 237(C).
    • Handle: RePEc:eee:energy:v:237:y:2021:i:c:s0360544221018739
    DOI: 10.1016/j.energy.2021.121625
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    References listed on IDEAS

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    Cited by:

    1. Yuan, Zhenhua & Chen, Zhichao & Zhang, Bo & Gao, Xuelin & Li, Jiawei & Qiao, Yanyu & Li, Zhengqi, 2023. "Study on the slagging trends of the pre-combustion chamber in industrial pulverized coal boiler under different excess air coefficients by CFD numerical simulation," Energy, Elsevier, vol. 264(C).
    2. Yuan, Zhenhua & Chen, Zhichao & Wu, Xiaolan & Zhang, Ning & Bian, Liguo & Qiao, Yanyu & Li, Jiawei & Li, Zhengqi, 2022. "An innovative low-NOx combustion technology for industrial pulverized coal boiler: Gas-particle flow characteristics with different radial-air-staged levels," Energy, Elsevier, vol. 260(C).
    3. Mohammadpour, Mohammadreza & Ashjaee, Mehdi & Houshfar, Ehsan, 2022. "Thermal performance and heat transfer characteristics analyses of oxy-biogas combustion in a swirl stabilized boiler under various oxidizing environments," Energy, Elsevier, vol. 261(PA).

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