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Carbonaceous aerosols emission reduction by using red mud additive in coal briquette
Fuel Processing Technology ( IF 7.5 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.fuproc.2019.106290
Yue Zhang , Zhenxing Shen , Bin Zhang , Jian Sun , Tian Zhang , Xin Wang , Tianshu Wang , Hongmei Xu , Pingping Liu , Tao Wang

Residential coal combustion is a major source of carbonaceous aerosol globally. Clean coal briquettes can be used for pollution emission control. In this study, red mud (RM), a high alkalinity byproduct generated from the Bayer process, was employed as additive in coal briquettes. Combustion tests of briquettes and raw coal were conducted to evaluate the emission reduction effects on PM₂.₅ and carbonaceous aerosols. The highest emission reduction rates of PM₂.₅, organic carbon (OC), elemental carbon (EC) for bituminous were 37.5%, 13.2%, 82.6% and for anthracite were 31.2%, 11.1%, 30.0%. Total carbon (TC)/PM₂.₅ remained stable between raw coal and briquettes while EC/OC was altered significantly (from 0.32 to 0.08 and 0.08 to 0.03 for bituminous and anthracite). Subfractions (in both OC, EC) showed a similar decreasing trend with the increase of RM content, while OC3 and OC4 reduction was not significantly compared to raw coal emission. Regression model showed that volatile matter and RM content are the two most significant (p < 0.01) fuel properties affecting the emission of PM₂.₅ and OC. Moisture and RM content influenced EC emission most significantly (p < 0.01). This study demonstrated that RM-added coal briquettes can effectively improve regional air quality.

中文翻译:

型煤中赤泥添加剂的碳质气溶胶减排

住宅用煤燃烧是全球碳质气溶胶的主要来源。洁净煤可用于污染排放控制。在这项研究中,红泥 (RM) 是一种拜耳工艺产生的高碱度副产品,被用作煤球的添加剂。对型煤和原煤进行燃烧试验,评价对PM2.₅和含碳气溶胶的减排效果。沥青的PM2.₅、有机碳(OC)、元素碳(EC)减排率最高,分别为37.5%、13.2%、82.6%,无烟煤分别为31.2%、11.1%、30.0%。原煤和煤球之间的总碳 (TC)/PM2.₅ 保持稳定,而 EC/OC 显着改变(烟煤和无烟煤从 0.32 到 0.08 和 0.08 到 0.03)。亚组分(在 OC、EC)随着RM含量的增加呈现出类似的下降趋势,而与原煤排放相比,OC3和OC4的减少并不显着。回归模型表明,挥发性物质和 RM 含量是影响 PM₂.₅ 和 OC 排放的两个最重要的 (p < 0.01) 燃料特性。水分和 RM 含量对 EC 排放影响最显着(p < 0.01)。本研究表明,添加 RM 的型煤可以有效改善区域空气质量。
更新日期:2020-03-01
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