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Does hydrothermal carbonization as a biomass pretreatment reduce fuel segregation of coal-biomass blends during oxidation?

机译：水热碳化作为生物质预处理是否会降低氧化过程中煤-生物质混合物的燃料偏析？

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摘要

Co-firing of biomass and coal may increase short-term renewable fuel usage. However, the lower heating value and higher reactivity (at lower temperatures) of raw biomass can result in fuel segregation in boilers, causing burnout at lower temperatures, lower steam generation efficiency and fouling. In addition, the relatively high water content of some biomasses requires extensive drying prior to combustion. These issues may be addressed by hydrothermally carbonizing moist biomasses to produce hydrochars that more closely resemble coal's properties prior to co-firing. In the present work, we probe the co-oxidation behavior of a series of hydrothermally carbonized biomass samples over a range of hydrochar-coal blend ratios to determine the degree of carbonization necessary to reduce fuel segregation. However, due to the presence of an extractable amorphous secondary char, even highly carbonized hydrochars have considerably higher oxidative reactivity than a representative bituminous coal sample. When blended, the hydrochars and coal display distinct derivative thermogravimetric oxidation ranges, in which a low-temperature peak is dominated by the secondary char oxidation, followed by a high-temperature char oxidation peak of the primary solid hydrochar. After extraction of the secondary char, the primary char displays a lower reactivity than the coal. As a co-fired fuel, it appears that blending hydrochars up to 10 wt% with a bituminous coal is possible as a partial fuel substitution. To increase the percentage of hydrochars blended with coal, it may be necessary to extract this secondary char (which contains valuable biofuels and platform chemicals) before blending.
机译：生物质和煤炭的混燃可能会增加短期可再生燃料的使用。但是，原始生物质的较低的热值和较高的反应性（在较低的温度下）会导致锅炉中的燃料偏析，从而在较低的温度下导致燃尽，较低的蒸汽产生效率和结垢。另外，某些生物质的相对较高的水含量需要在燃烧之前进行充分干燥。这些问题可通过在潮湿环境中对湿生物质进行水热碳化以产生与煤的性质更相似的水焦炭来解决。在目前的工作中，我们探讨了一系列水热碳化生物质样品在一定范围的炭-煤混合比下的共氧化行为，以确定减少燃料偏析所必需的碳化程度。但是，由于存在可萃取的无定形二级炭，即使高度碳化的炭也比代表性的烟煤样品具有更高的氧化反应性。当混合时，水煤和煤显示出明显的衍生热重氧化范围，其中低温峰由二次炭氧化占主导，其次是初级固体水炭的高温炭氧化峰。提取辅助焦炭后，主要焦炭的反应性低于煤炭。作为混合燃料，似乎可以将高达10 wt％的水煤与烟煤混合作为部分燃料替代品。为了增加与煤混合的碳氢化合物的百分比，可能需要在混合之前提取该次要碳（包含有价值的生物燃料和平台化学物质）。

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  • 来源
    《Energy Conversion & Management》 |2019年第2期|93-104|共12页
  • 作者

    Gao Lihui; Volpe Maurizio; Lucian Michela; Fiori Luca; Goldfarb Jillian L.;

  • 作者单位

    Boston Univ, Dept Mech Engn, 110 Cummington Mall, Boston, MA 02215 USA|China Univ Min & Technol, Sch Chem Engn & Technol, 1 Daxue Rd, Xuzhou 221116, Jiangsu, Peoples R China|Penn State Univ, John & Willie Leone Family Dept Energy & Mineral, EMS Energy Inst, Penn State Inst Energy & Environm, Hosler Bldg, University Pk, PA 16802 USA;

    Univ Trento, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento, Italy|Boston Univ, Pardee Ctr Study Longer Range Future, Bay State Rd, Boston, MA 02215 USA;

    Univ Trento, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento, Italy;

    Univ Trento, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento, Italy;

    Boston Univ, Dept Mech Engn, 110 Cummington Mall, Boston, MA 02215 USA|Penn State Univ, John & Willie Leone Family Dept Energy & Mineral, EMS Energy Inst, Penn State Inst Energy & Environm, Hosler Bldg, University Pk, PA 16802 USA|Univ Trento, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento, Italy|Cornell Univ, Dept Biol & Environm Engn, 226 Riley Robb Hall, Ithaca, NY 14853 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biomass; Coal; Co-firing; Hydrothermal carbonization; Fuel segregation; Secondary char;

    机译：生物质;煤炭;共烧;热碳化;燃料分离;二次焦;

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