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Axial and radial CO concentration profiles in an atmospheric bubbling FB combustor

机译：大气鼓泡FB燃烧器的轴向和径向CO浓度曲线

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摘要

Atmospheric Bubbling Fluidised Bed Combustion (ABFBC) of a bituminous coal and anthracite with particle diameters in the range 500-4000 mu m was investigated in a pilot-plant facility (circular section with 0.25 m internal diameter and 3 m height). The experiments were conducted at steady-state conditions using three excess air levels (10, 25 and 50 percent) and bed temperatures in the 750-900 deg C range. Combustion air was staged, with primary air accounting for 100, 80 and 60 percent of total combustion air. The effect of limestone addition was also tested. Large CO concentrations were observed inside the bed, up to 8 and 6 percent (v/v) in the cases of anthracite and bituminous coals, respectively. These concentrations decreased sharply as the gases emerged from the bed, and the CO flue gas concentration observed was in general less than 2000 and 4000 ppm, respectively. The CO flue gas concentration increased with air staging and with limestone addition, but decreased with either excess air or temperature increase. The observed results confirm the influence of sand particles (and probably of SO_2) in the 'quenching' of the oxygenated free radicals (HO and HO_2) reactions responsible for the CO oxidation inside the bed.
机译：在中试工厂（内径为0.25 m且高度为3 m的圆形截面）中研究了粒径为500-4000μm的烟煤和无烟煤的大气鼓泡流化床燃烧（ABFBC）。实验是在稳态条件下使用三种过量空气水平（10％，25％和50％）以及床温在750-900摄氏度范围内进行的。分阶段燃烧空气，一次空气分别占燃烧空气总量的100％，80％和60％。还测试了添加石灰石的效果。在床层内部观察到较大的CO浓度，无烟煤和烟煤的CO浓度分别高达8％和6％。随着气体从床中出来，这些浓度急剧下降，观察到的CO烟气浓度通常分别小于2000和4000 ppm。 CO烟气浓度随空气分级和添加石灰石的增加而增加，但随过量空气或温度升高而降低。观察到的结果证实了砂粒（可能还有SO_2）在导致床内CO氧化的氧化自由基（HO和HO_2）反应的“猝灭”中的影响。

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