de Almeida Sâmilla Gabriella Coelho, Fogarin Henrique Maziero, Costa Maria Angelica Martins, Dussán Kelly Johana
Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University-UNESP, Av. Prof. Francisco Degni, 55 Jardim Quitandinha, CEP, Araraquara, São Paulo, 14800-900, Brazil.
Bioenergy Research Institute (IPBEN), São Paulo State University (UNESP), Av. Prof. Francisco Degni, 55 Jardim Quitandinha, CEP, Araraquara, São Paulo, 14800-900, Brazil.
Environ Sci Pollut Res Int. 2024 Mar;31(12):17706-17717. doi: 10.1007/s11356-023-28171-y. Epub 2023 Jun 23.
This work conducted experimental combustion on a closed chamber using two different materials: mixture (1:1) sugarcane bagasse/straw and pre-treated biomass. The sampling method was an Andersen cascade impactor with eight stages. Tests were carried out on untreated biomass varying the velocities observed in the sampling duct (4.18; 5.20, 6.85, and 8.21 m.s). Pre-treated biomass tests were performed at 4.19 m.s because in this condition there is a higher speed stability inside the duct. During the combustion tests, the concentration of emitted particles was higher for the lower speed range, with an order of 4.19 > 5.40 > 6.85 > 8.21 m.s. The higher speeds observed inside the duct behaved as a dragging agent for particulate material. For the tests at the speed of 8.21 m.s where the flow inside the duct was 0.088 ms, this behavior is more evident. Considering the fine diameter particles (< 2.5 µm), they were emitted in a higher concentration, due to the biomass combustion process, which results in higher emission of ultrafine particles. The emission factors (EFs) obtained for PM for untreated biomass were in the range of 0.414 and 0.840. On the other hand, considering the pre-treated biomass, these factors were 0.70 and 1.51. The EFs of PM from the burning of the pre-treated biomass were higher when compared to untreated biomass, which is mainly due to the higher temperature of the process due to the higher HHV (higher heating value) of this material, caused by the removal of hemicellulose (4.71 times) and a proportional increase in lignin (1.52 times). Biomass combustion has the potential to partially replace fossil fuels in heat and energy generation. Nevertheless, more stringent and comprehensive legislation should be established to ensure that air quality is maintained. Furthermore, the emission factors obtained in this study might be useful as input data for air quality modeling in the context of sugarcane's burning biomass, thus, contributing to the generation of inventories that include emissions of this nature.
甘蔗渣/秸秆混合物（1:1）和预处理生物质。采样方法是使用具有八个阶段的安德森级联冲击器。对未处理生物质进行了测试，改变了在采样管道中观察到的流速（4.18、5.20、6.85和8.21米/秒）。预处理生物质测试在4.19米/秒的流速下进行，因为在这种条件下管道内的速度稳定性更高。在燃烧测试期间，较低速度范围内排放颗粒的浓度更高，顺序为4.19＞5.40＞6.85＞8.21米/秒。管道内观察到的较高速度对颗粒物质起到了拖拽作用。对于流速为8.21米/秒（此时管道内流量为0.088立方米/秒）的测试，这种行为更为明显。考虑到细直径颗粒（＜2.5微米），由于生物质燃烧过程，它们以更高的浓度排放，这导致超细颗粒的排放量更高。未处理生物质的颗粒物排放因子（EFs）在0.414至0.840范围内。另一方面，对于预处理生物质，这些因子为0.70和1.51。与未处理生物质相比，预处理生物质燃烧产生的颗粒物排放因子更高，这主要是由于该材料的较高高热值（HHV）导致过程温度更高，这是由于半纤维素去除（4.71倍）和木质素成比例增加（1.52倍）所致。生物质燃烧有潜力在供热和发电方面部分替代化石燃料。然而，应制定更严格和全面的法规以确保空气质量得以维持。此外，本研究中获得的排放因子可能作为甘蔗燃烧生物质背景下空气质量建模的输入数据，从而有助于生成包含此类排放的清单。
