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首页> 外文期刊>Energy & fuels >Effects of Air Staging Conditions on the Combustion and NO_x Emission Characteristics in a 600 MW Wall Fired Utility Boiler Using Lean Coal
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Effects of Air Staging Conditions on the Combustion and NO_x Emission Characteristics in a 600 MW Wall Fired Utility Boiler Using Lean Coal

机译：空气分级条件对贫煤600 MW壁挂式电站锅炉燃烧和NO_x排放特性的影响

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摘要

A three-dimensional numerical investigation is presented on the coal combustion and NO_x emission in a supercritical 600 MW wall fired utility boiler fed with lean coal The distributions of velocity, temperature, and species were obtained using a finite volume method and some validated submodels. The influence of air staging condition, i.e., overfire air (OFA) ratio and OFA port position, on combustion and especially on NO_x emission was studied. The temperature of the burner zone and the carbon content in fly ash increased with increasing OFA ratio, while the NO_x emission decreased with increasing OFA ratio. An increase of the OFA port position resulted in a decrease of NO_x emission and an increase of carbon content in fly ash. In addition, high burnout rate of pulverized coal and low NO_x emission can be achieved in the present boiler, in which OFA was injected from Port 3 with a ratio of 34.2%, This study provides new insights into the physical and chemical processes in a wall fired utility boiler fed with lean coal and also illustrates a method to reduce NO_x emission.
机译：进行了三维数值研究，研究了贫煤给水的超临界600 MW壁挂式电站锅炉的燃煤和NO_x排放。使用有限体积法和一些经过验证的子模型获得了速度，温度和种类的分布。研究了空气分级条件，即过火空气（OFA）比率和OFA端口位置对燃烧，尤其是NO_x排放的影响。燃烧器区域的温度和飞灰中的碳含量随OFA比的增加而增加，而NO_x排放随OFA比的增加而减少。 OFA端口位置的增加导致NO_x排放的减少和粉煤灰中碳含量的增加。此外，在现有的锅炉中，以34.2％的比例从3号端口注入OFA，可以实现较高的煤粉燃尽率和较低的NO_x排放量。该研究为墙体的物理和化学过程提供了新的见解。燃用贫煤的公用事业锅炉，还说明了减少NO_x排放的方法。

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  • 来源
    《Energy & fuels》 |2013年第sepaaocta期|5831-5840|共10页
  • 作者

    Hu Liu; Yinhe Liu; Guangzhou Yi; Li Nie; Defu Che;

  • 作者单位

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

    Dongfang Boiler Group Co., Ltd., Dongfang Electric Corporation, Chengdu, Sichuan 611731, China;

    Dongfang Boiler Group Co., Ltd., Dongfang Electric Corporation, Chengdu, Sichuan 611731, China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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