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Effect of particle size on particulate matter emissions during biosolid char combustion under air and oxyfuel conditions
Fuel ( IF 7.4 ) Pub Date : 2018-11-01 , DOI: 10.1016/j.fuel.2018.05.163
Sui Boon Liaw , Xujun Chen , Yun Yu , Mário Costa , Hongwei Wu

Abstract In an industrial scale furnace, solid fuels can be fired in a wide range of particle sizes. This study aims to investigate the effect of the particle size on particulate matter (PM) emissions during combustion under air and oxyfuel (30% O2/70% CO2) conditions. Biosolid chars prepared from the pyrolysis of three different biosolid particle sizes at 1300 °C were burned in a drop tube furnace. The experimental results indicate that a shift from small to large char particles leads to >55% reduction in PM1–10 emission when combustion occurs in air, likely due to less intense char fragmentation experienced by the large char particles. Such a reduction originates from a decrease in Mg, Ca, P, Si, Al and some trace elements (V, Co, Cu, Zn and Mn) release as PM1–10. In contrast, PM1 emission is not affected by the char particle size. However, under oxyfuel conditions, the PM1–10 emission from the small char particles is ∼65% of that released during combustion in air. In addition, the PM1–10 emission from large char particles only reduced by ∼27% when compared to that from small char particles. This observation is likely to result from the coalescence of ash particles to form PM with particle sizes >10 µm due to the increase surface mobility caused by repeated formation and decomposition of CaCO3 in the ash.

中文翻译:

空气和氧气条件下生物固体炭燃烧过程中颗粒大小对颗粒物排放的影响

摘要 在工业规模的熔炉中,可以燃烧各种粒径的固体燃料。本研究旨在研究在空气和富氧燃料 (30% O2/70% CO2) 条件下燃烧过程中颗粒尺寸对颗粒物 (PM) 排放的影响。由三种不同尺寸的生物固体颗粒在 1300 °C 下热解制备的生物固体炭在降管式炉中燃烧。实验结果表明,当在空气中燃烧时,从小炭颗粒到大炭颗粒的转变导致 PM1-10 排放减少 55% 以上,这可能是由于大炭颗粒所经历的炭碎裂程度较低。这种减少源于 Mg、Ca、P、Si、Al 和一些微量元素(V、Co、Cu、Zn 和 Mn)作为 PM1-10 释放的减少。相比之下,PM1 排放不受炭颗粒大小的影响。然而,在富氧燃料条件下,来自小炭颗粒的 PM1-10 排放量是空气中燃烧过程中排放量的 65%。此外,与小炭颗粒相比,大炭颗粒的 PM1-10 排放仅减少了约 27%。这一观察结果可能是由于灰烬中 CaCO3 的重复形成和分解导致表面流动性增加,灰烬颗粒聚结形成粒径 >10 µm 的 PM。
更新日期:2018-11-01
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