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Emission characteristics and formation mechanisms of PM2.5 from co-firing of algal biomass and coal
Journal of the Energy Institute ( IF 5.7 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.joei.2021.07.011
Lingzi Fei 1 , Bingtao Zhao 1 , Jianjian Liu 1 , Yaxin Su 2
Affiliation  

To address the emissions and formation of fine particulate matter (PM2.5) from co-firing of algal biomass (Chlorella (Ch), Sargassum (Sa), and Enteromarpha (En)) and pulverized coal (Huating coal), the emission characteristics were experimentally investigated using a one-dimensional tubular furnace. The results indicate that algae species, the mixing ratio, and the reaction temperature have complex impacts on PM2.5 emissions. Its emission characteristics present either single- or double-peak distribution. The higher temperature and higher biomass fraction accelerate the formation of PM2.5 during co-firing. Different from the reduction in NOx and SO2 emissions, the PM2.5 emission from algal biomass-based co-firing is higher than that of coal alone on the whole, particularly for Sa and En. For En, the maximum PM2.5 concentration occurred at 900 °C with 91.73 mg/m3 when 20% En was co-fired with 80% coal. Meanwhile, the PM2.5 emission yield reached the peak of 553.64 ( × 10−2) mg/g. For Sa, the highest PM2.5 concentration and PM2.5 emission yield appeared when 20% Sa and 80% coal were co-fired at 1000 °C, were 125.30 mg/m3 and 354.41 ( × 10−2) mg/g, respectively. For Ch, the highest PM2.5 concentration appeared when 20% Ch and 80% coal were co-fired at 1000 °C and reached 1.11 mg/m3, but the largest PM2.5 emission yield was 3.21 ( × 10−2) mg/g when 20% Ch and 80% coal were co-fired at 1100 °C. PM2.5 generated from co-firing are mainly formed by vaporization and homogeneous/heterogeneous condensation, as well as fragmentation of internal/external minerals and char particles. In addition, it also depends upon a series of reactions between the alkali metal salt and other incombustible particles. The morphological characteristics of ash residues from Ch co-fired with coal were irregular and fragmented, and the structure was relatively compact, and those for Sa and En co-fired with coal are similar, both of which are irregular massive structures with white crystal particles attached.



中文翻译:

藻类生物质与煤混烧PM2.5的排放特征及形成机制

为了解决藻类生物质(小球藻 (Ch)、马尾藻 (Sa)Enteromarpha (En))和粉煤(华亭煤)烧产生的细颗粒物 (PM 2.5 )的排放和形成问题,排放特征为使用一维管式炉进行实验研究。结果表明,藻类种类、混合比和反应温度对 PM 2.5排放有复杂的影响。其发射特性呈单峰或双峰分布。更高的温度和更高的生物质比例加速了混烧过程中 PM 2.5的形成。不同于NO x和SO 2的还原排放方面,基于藻类生物质的混烧的 PM 2.5排放总体上高于单独的煤炭,尤其是SaEn。对于En,当 20% En与 80% 煤共同燃烧时,最大 PM 2.5浓度出现在 900 °C 时,为 91.73 mg/m 3。同时,PM 2.5排放量达到峰值553.64 ( × 10 -2 ) mg/g。对于Sa,当 20% Sa和 80% 煤在 1000 °C 共燃时出现最高 PM 2.5浓度和 PM 2.5排放量,为 125.30 mg/m 3和 354.41 ( × 10 -2 ) mg/g,分别。对于Ch,当 20% Ch和 80% 煤在 1000 °C 共燃时出现最高 PM 2.5浓度,达到 1.11 mg/m 3,但最大 PM 2.5排放量为 3.21 ( × 10 -2 ) mg/ g 当 20% Ch和 80% 煤在 1100 °C 下共烧时。下午2.5混烧产生的主要是汽化和均质/异质冷凝,以及内部/外部矿物和炭颗粒的碎裂。此外,它还取决于碱金属盐与其他不燃颗粒之间的一系列反应。Ch与煤共烧灰渣形态特征不规则、破碎,结构较致密,SaEn与煤共烧灰渣形态特征相似,均为白色结晶颗粒的不规则块状结构随附的。

更新日期:2021-07-28
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