Effects of Air Flowrate on the Combustion and Emissions of Blended Corn Straw and Pinewood Wastes

文献类型： 外文期刊

第一作者： Meng, Xiaoxiao

作者： Meng, Xiaoxiao;Zhou, Wei;Sun, Rui;Meng, Xiaoxiao;Rokni, Emad;Levendis, Yiannis A.;Zhao, Honghua

作者机构：

关键词： biomass combustion; biomass blending; effect of primary air; fixed-bed reactor; corn straw; gaseous emissions

期刊名称：JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME （ 影响因子：2.903； 五年影响因子：2.596 ）

ISSN： 0195-0738

年卷期： 2019 年 141 卷 4 期

页码：

收录情况： SCI

摘要： This research investigated the effects of the specific primary (under-fire) air flowrate ((m) over dot(air)) on the combustion behavior of a 50-50wt % blend of raw corn straw (CS) and raw pinewood wastes in a fixed-bed reactor. This parameter was varied in the range of 0.079-0.226 kg m(-2) s(-1), which changed the overall combustion stoichiometry from air-lean (excess air coefficient lambda = 0.73) to air-rich (excess air coefficient lambda = 1.25) and affected the combustion efficiency and stability as well as the emissions of hazardous pollutants. It was observed that by increasing (m) over dot(air), the ignition delay time first increased and then decreased, the average bed temperatures increased, both the average flame propagation rates and the fuel burning rates increased, and the combustion efficiencies also increased. The emissions of CO as well as those of cumulative gas phase nitrogen compounds increased, the latter mostly because of increasing HCN, while those of NO were rather constant. The emissions of HCl decreased but those of other chlorinecontaining species increased. The effect of (m) over dot(air) on the conversion of sulfur to SO2 was minor. By considering all of the aforesaid factors, a mildly overall air-rich (fuel-lean) (lambda = 1.04) operating condition can be suggested for corn-straw/pinewood burning fixed-bed grate-fired reactors.

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