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Experiences with firing pyrolysis fuel oil on industrial scale

机译：在工业规模上烧制热解燃料油的经验

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To meet the industrial demands of biomass combustion at industrial scale the performance of pyrolysis oil combustion on an industrial scale is examined. In this paper the combustion characteristics of different pyrolysis oils are compared to a reference case of heavy fuel oil (HFO) in a 9 MWth industrial boiler. Combustion phenomena like flame-behavior, minimum air flow requirement, fouling of the atomizer tip and overall emissions are described in this paper for the fuels considered. The tests were carried out with a Stork Double Register Burner (DRB), using a Y-jet steam-assisted atomizer. The pyrolysis oils were made from pine and empty fruit bunch (EFB), of which the latter one batch was fired filtered and one unfiltered. Fuels were fired at one constant load, which varied between the fuels depending on fuel availability. A small natural gas pilot flame of 0.6 MW was required for flame stabilization when firing the pyrolysis oils, which was not needed for HFO firing. Further, the flame of the pyrolysis oils stabilized at a larger distance from the flame-stabilizer than the HFO flame, probably due to the moisture content of the pyrolysis oils. Firing pine oil gave a significant lower NO_x emission when comparing it to HFO, which is probably due to the reduced flame temperature and lower level of nitrogen in the fuel. Pine oil combustion was homogeneous and no abnormalities were visible. When firing filtered EFB, the combustion was inhomogeneous and harder to stabilize although the filtered EFB had a lower moisture content than the pine oil, Also the required air excess for complete combustion (low CO emission) increased. Combustion of the unfiltered EFB oil was inhomogeneous as well and had some stability difficulties, excess air for complete combustion was more than with the filtered EFB. The main outcome of this test is however that it is proven to be feasible to fire pyrolysis oil at industrial scale with standard equipment, with only a small natural gas pilot flame to enhance stabilization.
机译：为满足产业规模的生物量燃烧的工业需求，研究了对工业规模的热解油燃烧的性能。本文将不同热解油的燃烧特性与9 MWTH工业锅炉中重型燃料油（HFO）的参考情况进行比较。在燃料考虑的燃料中描述了燃烧现象，如火焰行为，最小空气流量要求，雾化器尖端的污垢和整体排放。使用Y型喷射蒸汽辅助雾化器，用鹳双升降器（DRB）进行测试。热解油由松树和空果实束（EFB）制成，其中后者一批被烧制过滤，一个未过滤器。燃料在一个恒定的载荷下被烧制，这取决于燃料可用性之间的燃料。在烧制热解油时，火焰稳定需要0.6mW的小天然气先导火焰，这是不需要HFO烧制所需的。此外，热解油的火焰在距火焰稳定剂的距离大于HFO火焰的距离稳定，可能是由于热解油的水分含量。当将其与HFO相比，烧制松油发射出显着的较低的NO_X发射，这可能是由于燃料中的燃料温度降低和较低的氮气水平。松油燃烧是均匀的，没有看到异常。当烧制过滤EFB时，燃烧不均匀且稳定稳定，尽管过滤的EFB具有低于松油的水分含量较低，但是完全燃烧的所需空气过量（低CO发射）增加。未经过滤的EFB油的燃烧也不是不均匀的，并且具有一些稳定性困难，完全燃烧的过量空气比过滤的EFB更多。然而，该测试的主要结果如此，据证明是在工业规模用标准设备灭火油的可行性，只有小型天然气先导火焰来增强稳定。

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