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首页> 外文期刊>Environmental Engineering Science >Formation and Control of Nitrogen Oxide in the Heating System of a Coke Oven
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Formation and Control of Nitrogen Oxide in the Heating System of a Coke Oven

机译：焦炉加热系统中氮氧化物的形成与控制

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Formation of nitrogen oxides was investigated in the heating system of a coke oven during the combustion of enriched blast furnace gas (BFG). Due to the high temperatures in the heating system in situ measures cannot be taken. With the help of computational fluid dynamics (CFD) the combustion process can be investigated in order to predict the formation reaction of NO. For this problem a nonadiabatic simulation model composed of different models and submodels that described turbulence of flow, radiation, flame characteristics, species transport, and the formation of NO was used to calculate the thermal and prompt NO emission in a pseudo steady state. The simulation tool was applied to predetermined operating points of the coke plant. The goal of this study was to investigate the influence of a staged combustion of BFG that was enriched with natural gas, converter gas, and alternatively coke oven gas on NO emission. The NO emissions of the single-stage BFG combustion increased with rising air excess up to an O2 offgas content of 3%. After having passed this maximum the NO emissions decreased. Although the double-stage NO emissions show a slight increase with rising air excess, the CFD analysis demonstrated that a double-stage combustion of BFG produces lower NO emissions than a single-stage combustion.
机译：在浓缩高炉煤气（BFG）燃烧过程中，在焦炉加热系统中研究了氮氧化物的形成。由于加热系统中的高温，无法采取现场措施。借助计算流体力学（CFD），可以研究燃烧过程，以预测NO的形成反应。对于这个问题，一个非绝热模拟模型由不同的模型和子模型组成，这些模型和子模型描述了流动，辐射，火焰特性，物质迁移和NO的形成紊流，用于计算伪稳态下的热NO排放和即时NO排放。将模拟工具应用于焦化厂的预定操作点。这项研究的目的是研究富含天然气，转炉气和焦炉煤气的高炉煤气的分段燃烧对NO排放的影响。单级高炉煤气燃烧的NO排放随着过量空气的增加而增加，直至O2废气含量达到3％。超过此最大值后，NO排放量减少。尽管随着空气过量的增加，两级NO排放量略有增加，但CFD分析表明，高炉煤气的两级燃烧产生的NO排放量比单级燃烧低。

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