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根据NOx的生成机理,利用FLUENT商用软件,通过利用CFD平台,对采用深度分级燃烧四角切圆的炉膛试验台内气固两相湍流流场进行冷态模拟。本文研究表明,采用合适的数学模型和计算方法,进行四角切圆燃煤锅炉炉内气固两相流的数值模拟是可行的。通过对不同一次风和二次风布置状况进行模拟,在实现炉膛中心处呈还原性气氛,炉膛四壁成氧化性气氛的水平分级的条件下,优化垂直分级,找出理想的气固两相流动状况下的一、二次风的布置工况,初步找出深度分级降低NOx生成的方法。
According to the formation mechanism of NOx, the FLUENT commercial software is used to simulate the gas-solid two-phase turbulent flow field in a furnace test rig with a deep-grade four-corner tangent furnace by using the CFD platform. The research in this paper shows that it is feasible to conduct numerical simulation of gas-solid two-phase flow in a tangentially fired boiler by the proper mathematical model and calculation method. Through the simulation of different primary air and secondary air arrangement, the vertical classification was optimized under the condition of reducing atmosphere at the center of the furnace and horizontal classification of the four walls of the furnace into an oxidizing atmosphere, and the ideal gas-solid two-phase Flow conditions of the primary and secondary wind conditions, initially identified the depth of classification to reduce NOx generation method.