生物质气化产物在流化床内旋涡加力燃烧的CFD建模

S. Kobzar, I. Borisov, A. Khalatov, A. Teplitski, Y. Pitsukha
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引用次数: 0

摘要

对二次风涡送风的流化床生物质气化产品加力燃烧过程进行了CFD模拟。确定了二次空气加热对烟气生态特性的影响。模拟结果表明,气化产物在主腔内旋转,形成中心涡,服从固体旋转规律。二次空气温度的增加导致其切向速度的增加,结果是离心质量力的增加。计算表明,随着二次风温度的升高,湍流动能的最大值向外围移动,且绝对值增大。这导致更有效地混合中央(生产者气体)和外围(二次空气)流。因此,这会导致更完全的燃烧。确定了二次风加热对炉体生态特性的影响。由于空气从30°C加热到300°C,一氧化碳的浓度降低了1.5倍以上。氮氧化物的浓度几乎没有变化,为3.5 mg /nm3。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CFD MODELING OF VORTEX AFTERBURNING OF BIOMASS GASIFICATION PRODUCTS IN A FLUIDIZED BED FURNACE
CFD modeling of the afterburning of biomass gasification products in a fluidized bed furnace with a vortex supply of secondary air has been carried out. The effect of secondary air heating on the ecological characteristics of flue gases has been determined. Modeling has shown that gasification products swirl in the primary chamber with the formation of a central vortex, which obeys the law of solid-body rotation. An increase in the temperature of the secondary air leads to an increase in its tangential velocity and, as a consequence, to an increase in centrifugal mass forces. Calculations have shown that with an increase in the secondary air temperature, the maximum of the kinetic energy of turbulence shifts to the periphery and increases in absolute value. This results in more efficient mixing of the central (producer gas) and peripheral (secondary air) streams. As a result, this leads to a more complete combustion. The influence of secondary air heating on the ecological characteristics of the furnace has been determined. As a result of air heating from 30° C to 300° C, the concentration of carbon monoxide decreases by more than 1.5 times. The concentration of nitrogen oxides practically does not change and amounts to 3.5 mg /nm3.
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