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首页> 外文期刊>Fuel >Influence of operating conditions and coal properties on NO_x and N_2O emissions in pressurized fluidized bed combustion of subbituminous coals
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Influence of operating conditions and coal properties on NO_x and N_2O emissions in pressurized fluidized bed combustion of subbituminous coals

机译：亚烟煤加压流化床燃烧中工况和煤质对NO_x和N_2O排放的影响

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This experimental study is aimed at finding effects of operating conditions in PFBC on nitrogen oxide emissions for subbituminous coals differing in ash contentlcomposition, combustion/gasification reactivities and in particle size distribution. The experiments have been done on a smaller laboratory apparatus with ID = 8 cm. The effects of operating pressure (0.1-1 MPa), temperature of the fluidized bed (800-900 deg C), freeboard temperature and oxygen concentration (3-10 vol. percent) on the nitrogen oxides emissions are relatively complex, coupled with temperature of burning coal particles. The coal ash contentlcomposition (esp. CaO and Fe_2O_3) and fly ash freeboard concentration play an important role in formation/destruction chemistry of both NO and N_2O. The NO_x emissions decrease with increasing operating pressure at the same volumetric oxygen concentration and temperature. Temperature, volatile content, reactivities of coals and ash composition are the most important factors for N_2O emissions. The N_2O emissions are either almost constant or can exhibit a maximum at increasing operating pressure. Influence of increasing oxygen concentration on NO_x and N_2O emissions is more pronounced at lower operating pressures, esp. for the less reactive, medium ash coal. The particle size distribution of the coal (influence of coal dust) can cause characteristic changes in NO_x and N_2O emissions in PFBC, esp. at lower combustion temperatures (800-840 deg C). The emission changes are dependent on ash properties/composition.
机译：这项实验研究的目的是发现PFBC的操作条件对烟灰组成，燃烧/气化反应性和粒度分布不同的次烟煤氮氧化物排放的影响。实验是在ID = 8 cm的小型实验室设备上完成的。工作压力（0.1-1 MPa），流化床温度（800-900摄氏度），干舷温度和氧气浓度（3-10％体积百分比）对氮氧化物排放的影响相对复杂，并伴有温度燃烧的煤颗粒。煤灰含量组成（特别是CaO和Fe_2O_3）和飞灰干舷浓度在NO和N_2O的形成/破坏化学中都起着重要作用。在相同的氧气体积浓度和温度下，NO_x排放随着工作压力的增加而降低。温度，挥发物含量，煤的反应性和灰分组成是N_2O排放的最重要因素。 N_2O排放几乎是恒定的，或者在增加的工作压力下会显示出最大值。特别是在较低的工作压力下，氧气浓度增加对NO_x和N_2O排放的影响更为明显。用于反应性较低的中灰煤。煤的粒径分布（影响煤粉尘）会导致PFBC中NO_x和N_2O排放物的特性发生变化，尤其是。在较低的燃烧温度（800-840摄氏度）下。排放变化取决于灰分性质/组成。

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