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Improving gas/particle flow deflection and asymmetric combustion of a 600 MWe supercritical down-fired boiler by increasing its upper furnace height

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  • Kuang, Min
  • Zhu, Qunyi
  • Ling, Zhongqian
  • Ti, Shuguang
  • Li, Zhengqi

Abstract

A solution characterized by lengthening its short upper furnace was put forward for improving the gas/particle flow deflection and asymmetric combustion within a 600 MWe supercritical down-fired boiler. Based on the present design dimensionless upper furnace height CH2 = 0.864, upper furnace was lengthened in turn to CH2 = 1.00, 1.125, and 1.263 so as to form four comparable settings. Accordingly, cold-modeling gas/particle flow experiments and numerical simulations on coal combustion were performed at these settings for confirming the solution and meanwhile recommending a reasonable CH2 setup. Moreover, real-furnace measurements, used to confirm the numerical simulation validity, were carried out under normal full load. Results at the design setting (CH2 = 0.864) show shat a severely deflected gas/particle flow field appears, with (i) the downward gas/particle flow penetrating much deeper in the front-half side than in the rear-half side and (ii) the upward flow fully deflecting towards the front-half side. Consequently, a bad asymmetric combustion pattern with gas temperatures being much higher in the rear-half side than in the front-half side (temperature gap reaching about 300–600 °C) develops, generating poor burnout and high NOx emissions. Additionally, the simulated results are consistent well with the acquired real-furnace data. In comparison with cold-modeling gas/particle flow experiments, the simulated downward gas/particle flow penetrates clearly shallower in a hot environment. Lengthening upper furnace apparently weakens both the experimental and simulated flow-field deflection and meanwhile improves the asymmetric gas velocity distribution in the upper furnace. As CH2 increases to 1.125 and 1.263, both the experimental and simulated flow-field symmetries are acceptable, accompanied by symmetrical gas velocity distribution in the upper furnace, improved burnout rate, and lowered NOx emissions. A comprehensive consideration of symmetrical combustion, high burnout rate, relatively low NOx emissions, and controlled cost for lengthening upper furnace suggests that a reasonable CH2 should be set at 1.125.

Suggested Citation

  • Kuang, Min & Zhu, Qunyi & Ling, Zhongqian & Ti, Shuguang & Li, Zhengqi, 2017. "Improving gas/particle flow deflection and asymmetric combustion of a 600 MWe supercritical down-fired boiler by increasing its upper furnace height," Energy, Elsevier, vol. 127(C), pages 581-593.
    • Handle: RePEc:eee:energy:v:127:y:2017:i:c:p:581-593
    DOI: 10.1016/j.energy.2017.04.002
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    References listed on IDEAS

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    1. Kuang, Min & Li, Zhengqi & Zhu, Qunyi & Zhang, Yan, 2013. "Performance assessment of staged-air declination in improving asymmetric gas/particle flow characteristics within a down-fired 600 MWe supercritical utility boiler," Energy, Elsevier, vol. 49(C), pages 423-433.
    2. Chen, Zhichao & Wang, Qingxiang & Wang, Bingnan & Zeng, Lingyan & Che, Miaomiao & Zhang, Xin & Li, Zhengqi, 2017. "Anthracite combustion characteristics and NOx formation of a 300MWe down-fired boiler with swirl burners at different loads after the implementation of a new combustion system," Applied Energy, Elsevier, vol. 189(C), pages 133-141.
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    1. Belošević, Srdjan & Tomanović, Ivan & Crnomarković, Nenad & Milićević, Aleksandar, 2019. "Full-scale CFD investigation of gas-particle flow, interactions and combustion in tangentially fired pulverized coal furnace," Energy, Elsevier, vol. 179(C), pages 1036-1053.

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