Effect of Opposing Tangential Primary Air Jets on the Flue Gas Velocity Deviation for Large-Scale Tangentially Fired Boilers

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• 作者：Yuegui Zhou ; Mingchuan Zhang ; Tongmo Xu ; Shien Hui
• 刊名：Energy & Fuels
• 出版年：2009
• 出版时间：November 19, 2009
• 年：2009
• 卷：23
• 期：11
• 页码：5375-5382
• 全文大小：975K
• 年卷期：v.23,no.11(November 19, 2009)
• ISSN：1520-5029

文摘

An experimental and numerical study on the effect of opposing tangential primary air jets with different biased angles on aerodynamic fields in the furnace and the flue gas velocity deviation in the horizontal flue gas pass was carried out in a tangentially fired boiler model of a 600 MW unit. The results show that the flow fields in the left and right sides of the upper furnace are obviously different and the gas velocity deviation in the horizontal flue gas pass is large for the original tangentially fired system. However, the actual tangential circle diameter in the furnace, the residual swirl intensity at the furnace exit, and the flue gas velocity deviation in the horizontal flue gas pass will be reduced when the appropriate opposing tangential angle of primary air jets is adopted in a new tangential firing system. The appropriate opposing tangential angle of primary air jets is 10−15° relative to the original primary air jets, and the ratio of opposing tangential momentum flux moment to tangential momentum flux moment XJ should be controlled at the low limit of 0.92 to decrease the flue gas velocity deviation in the horizontal flue gas pass.