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• W2912922056 endingPage "1562" @default.
• W2912922056 startingPage "1551" @default.
• W2912922056 abstract "To further reduce unburned combustible in fly ash of the improved down-fired boiler with the eccentric-swirl-secondary-air combustion technology, a breakthrough idea is proposed to significantly increase the primary air velocity by reducing the damper opening of vent air. In this study, the effects of the high primary air velocity on anthracite burnout and NOx formation are investigated via industrial experiments. With increasing primary air velocity, there is a significant change in the dominant role between the inhibition effect of pulverized coal concentration reduction and the promotion effect of the recirculation zone enlargement on the pulverized coal ignition. With increasing primary air velocity from 23.9 to 32.6 m/s, the flue gas temperature in the furnace hopper increases by approximately 75 °C. Besides, the increase of coal char burnout rate at the initial combustion stage is larger than that at the intense combustion stage, and the sum of NOx reduction rates at the initial and intense combustion stages varies from 57 to 61%. The boiler thermal efficiency basically rises linearly from 91 to 92.34% with increasing primary air velocity from 23.9 to 32.6 m/s, and the change of primary air velocity has little influence on the NOx emission at the furnace outlet. Compared with the original boiler, unburned combustible in fly ash decreases by approximately four percentage points, boiler thermal efficiency increases by 3.3%, and NOx emission decreases by 43.3% under the primary air velocity of 32.6 m/s for the improved boiler." @default.
• W2912922056 created "2019-02-21" @default.
• W2912922056 creator A5009884297 @default.
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• W2912922056 date "2019-03-01" @default.
• W2912922056 modified "2023-10-12" @default.
• W2912922056 title "Experimental characterization of anthracite combustion and NO emission for a 300-MWe down-fired boiler with a novel combustion system: Influence of primary and vent air distributions" @default.
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• W2912922056 doi "https://doi.org/10.1016/j.apenergy.2019.01.080" @default.
• W2912922056 hasPublicationYear "2019" @default.
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