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The study of the effect of operating parameters on the PAH formation during the combustion of coconut shell in a fluidised

机译:流化床中椰子壳燃烧过程中操作参数对多环芳烃形成影响的研究

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摘要

The effect of combustion parameters on the PAH formation from coconut shell combustion in a FBC was investigated. Among the combustion parameters studied which included temperature, excess air, fuel particle size, and fuel moisture content, only excess air proved to have significant influence on the PAH formation. At 750 ℃, an increase of excess air from 20 to 80% resulted in a twelfth fold reduction of PAH emission. At high excess air levels, the combustion temperature had small influence on PAH emission level. In addition to above mentioned combustion parameters, the addition of secondary air to the freeboard was investigated. Due to the relatively low temperature, the addition of secondary air resulted in higher PAH emission. A strong correlation between the combustion efficiency and the PAH emission was observed. According to the results, the CO concentration can be employed as an indicator of PAH level in the exhaust gas.
机译:研究了燃烧参数对FBC中椰子壳燃烧产生的PAH的影响。在所研究的燃烧参数中,包括温度,过量空气,燃料颗粒尺寸和燃料水分含量,只有过量空气被证明对PAH的形成有重大影响。在750℃时,过量空气从20%增加到80%导致PAH排放降低了十二倍。在过量空气水平较高时,燃烧温度对PAH排放水平的影响很小。除上述燃烧参数外,还研究了向干舷添加二次空气的情况。由于温度相对较低,因此添加二次空气会导致更高的PAH排放。观察到燃烧效率和PAH排放之间有很强的相关性。根据结果​​,CO浓度可以用作废气中PAH水平的指标。

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