Since the use of pulverized coal as the fuel for the aggregate drying burner can greatly reduce the running cost of aggregate drying, a large amount of polluted gas was generated during the operation, so how to reduce the pollution caused by the aggregate pulverized coal burner things were the key to burner development. The method of numerical simulation was used to analyze the effects of different air velocity on emissions characteristics of aggregate drying pulverized coal burner and the features of emissions was summarized. The control model of the internal field in aggregate drying pulverized coal burner was constructed, which was based on the mechanism of coal combustion and the crafts of aggregate drying. Then the combustion process was numerically simulated by using the Fluent software. Regarding the velocity of primary air, secondary air and tertiary air as influence factors and the mass fraction of CO, CO2, NO, SO2 at the central axis of pulverized coal burner as the evaluating indicators, the effects of the velocity of primary air, secondary air and tertiary air on emission characteristics were analyzed. The results showed that with the velocity of primary air, secondary air, tertiary air increasing the burning was more completely, the lower of the velocity of the primary air, secondary air, tertiary air, the less NO was produced, the mass fraction of SO2 was least when the velocity of tertiary air was 40 m/s. The ranges of reasonable control parameters were 30~35 m/s for the velocity of primary air, 45~50 m/s for the velocity of secondary air, 30~40 m/s for the velocity of tertiary air.
Haiying CHENG Jianxin LI Yong ZHANG Jing WANG Zhiyong HU
. Effects of air velocity on emission characteristics of aggregate drying pulverized coal burner[J]. The Chinese Journal of Process Engineering, 2019
, 19(5)
: 1037
-1046
.
DOI: 10.12034/j.issn.1009-606X.218293
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