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Transformation of mineral and emission of particulate matters during co-combustion of coal with sewage sludge

机译：煤与污水污泥共燃过程中矿物的转化和颗粒物的排放

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Co-combustion of coal with sewage sludge was carried out in laboratory-scaled drop tube furnace to understand the interaction between different fuels. The combustion conditions were selected as follows: the raw material feeding rate was 0.2-0.3 g/min, temperature was 1200℃, the atmosphere of 10% O_2 and N_2 being balance was used to guarantee an air ratio of 1.5, and the residence time varied from 0.6 to 2.4 s. The coal/sewage sludge is kept at 50:50 (wt% to wt%), four fuel pairs were selected with respect to the mineral association within individual fuel. The results showed the obvious interaction between coal and sewage sludge during their co-combustion. For the carbon conversion, the devolatilization of mixing fuel occurred quickly; the combustion of both char and evolved volatile progressed almost completely. As a result, the unburnt carbon was almost zero in the fly ash. In addition, the evolution of both mineral and PM varied with the association of minerals in raw fuels. For both coal and sewage sludge rich in included minerals, they combusted separately in the furnace, less interaction occurred accordingly. Conversely, for both them rich in excluded minerals, the minerals reacted with each other to form much agglomeration, and therefore, the particle size of the fly ash was increased, while the amount of PM was decreased, which changed as the coarse fly ash particles. Finally, for the case of coal rich in excluded mineral and sludge rich in included mineral, their co-combustion led to the interaction of their minerals. As a result, more the fine particles were formed, which in part changed into PM. For the vaporized trace elements, they were adsorbed by the melt CaPO_4/Al-Si in the ash and accordingly, their contents in the particulate matter were reduced whereas their particle size distribution shifted to the large value.
机译：在实验室规模的滴管炉中进行了煤与污水污泥的共燃烧，以了解不同燃料之间的相互作用。燃烧条件选择如下：原料进料速度为0.2-0.3 g / min，温度为1200℃，平衡使用10％O_2和N_2的气氛以保证1.5的空气比，停留时间从0.6到2.4秒不等。煤/污水污泥保持在50:50（wt％到wt％），根据单个燃料中的矿物组成选择了四个燃料对。结果表明，煤和污水污泥在燃烧过程中有明显的相互作用。对于碳转化，混合燃料的脱挥发分迅速发生。炭和挥发物的燃烧几乎完全进行了。结果，飞灰中未燃烧的碳几乎为零。此外，矿物和PM的演变随原始燃料中矿物的关联而变化。对于富含内含矿物质的煤和污水污泥，它们分别在炉中燃烧，因此相互作用较少。相反，对于富含排除矿物质的两种矿物，矿物质彼此反应形成大量的团块，因此，粉煤灰的粒径增大，而PM的含量降低，随粗粉煤灰颗粒的变化而变化。 。最后，对于富含排除矿物质的煤炭和富含排除矿物质的污泥而言，它们的共燃烧导致了它们矿物之间的相互作用。结果，形成了更多的细颗粒，其部分变为PM。对于汽化的痕量元素，它们被灰烬中的熔融CaPO_4 / Al-Si吸附，因此，它们在颗粒物质中的含量降低，而其粒径分布却移至较大的值。

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