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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >NO_x EMISSIONS IN A STEEL REHEAT FURNACE FIRING BY-PRODUCT FUELS
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NO_x EMISSIONS IN A STEEL REHEAT FURNACE FIRING BY-PRODUCT FUELS

机译：钢加热炉燃烧副产物燃料中的NO_x排放

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A DOE-funded program was used to understand the mechanisms that control the formation of NO_x during the combustion of steelmaking by-product fuels and to investigate possible low-cost control options to minimize the NO_x emissions. This paper discusses the CFD modeling results of NO_x emissions in a reheat furnace. The reheat furnace has a total of 20 burners distributed over three firing zones. The furnace is fired at a rate of 250Xl0_6 Btu/hr and an overall stoichiometric ratio of 1.06 (fuel lean). Fuels with heating values of approximate 500 Btu/SCF were examined, including coke oven gas (COG), blast furnace gas (BFG) and a blend of COG, BFG, natural gas (NG) and nitrogen. A good range of process variables was modeled to examine effects of fuel type, air preheat, stoichiometric ratio, firing rate and burner stoichiometry distribution on NO_x emissions. Modeling results indicated that NO_x formation in the reheat furnace is dominated by thermal NO, with some variation depending on the fuel fired. Temperature profiles showed an effective separation of the furnace interior into top and bottom zones as a result of the steel slab barrier. Higher temperatures characterized the bottom zone and elevated NO_x levels as a result of the confined space and enhanced fuel air mixing provided by the slab supports. Results also showed that rebuming of NO_x plays a significant role in final NO_x emissions with 30-40% of NO_x formed being reduced by reburning in most cases. Modeling identified that operating the side burners in each burner zone slightly substoichiometric (while maintaining the overall furnace stoichiometry at 1.06) provided significant NO_x reduction via reburning. NO_x reductions of 23% and 30% were predicted when firing with COG and COG-NG-Air fuels, respectively. Overall furnace exit temperatures and heat flux profiles were not significantly affected by the biased firing.
机译：美国能源部资助的程序用于了解在炼钢副产物燃料燃烧过程中控制NO_x形成的机制，并研究可能的低成本控制方案以最大程度地减少NO_x排放。本文讨论了再热炉中NO_x排放的CFD模拟结果。再热炉共有20个燃烧器，分布在三个燃烧区域。以250×10 6 Btu / hr的速率和1.06的总化学计量比（贫燃料）燃烧该炉。检查了热值约为500 Btu / SCF的燃料，包括焦炉气（COG），高炉煤气（BFG）以及COG，BFG，天然气（NG）和氮气的混合物。对大量过程变量进行了建模，以检查燃料类型，空气预热，化学计量比，燃烧率和燃烧器化学计量分布对NO_x排放的影响。建模结果表明，再热炉中的NO_x形成主要由热NO决定，其变化取决于燃烧的燃料。温度曲线表明，由于钢坯的阻挡，炉内有效地分成了顶部和底部区域。由于有限的空间和平板支架提供的增强的燃料空气混合，较高的温度表征了底部区域和NO_x水平升高。结果还表明，NO_x的再沸腾在最终的NO_x排放中起着重要作用，在大多数情况下，通过再燃烧减少形成的NO_x的30-40％。模型确定，在每个燃烧器区域中运行侧燃烧器时，其化学计量比化学计量稍低（同时将炉膛总化学计量保持在1.06），通过再燃烧可显着降低NO_x。预计分别使用COG和COG-NG-Air燃料燃烧时，NO_x减少23％和30％。偏向烧成不会显着影响整体炉膛出口温度和热通量分布。

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