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首页> 外文期刊>Energy & fuels >Effect of Hydrothermal Carbonization on the Combustion and Gasification Behavior of Agricultural Residues and Macroalgae: Devolatilization Characteristics and Char Reactivity
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Effect of Hydrothermal Carbonization on the Combustion and Gasification Behavior of Agricultural Residues and Macroalgae: Devolatilization Characteristics and Char Reactivity

机译：水热碳化对农业残渣和大型藻类燃烧和气化行为的影响：脱挥发分特性和炭反应性

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摘要

Hydrothermal carbonization (HTC) can potentially improve the fuel quality of low-value biomass resources that are otherwise unsuitable for use in industrial heat and power applications. The effect of HTC pretreatment on the combustion and gasification behavior of two agricultural residues (grape marc and sugar cane bagasse) and a freshwater species of macroalgae was investigated, with an emphasis on devolatilization behavior and char reactivity. HTC was carried out in a custom-built, laboratory-scale, batch reactor at three temperatures, 180, 220, and 260 degrees C, with a slurry density of 15% w/w dry biomass in water. The volatile release behavior of the collected products (hydrochars) and untreated biomass feedstocks were characterized by dynamic thermogravimetric analysis. Char reactivity was characterized by isothermal gasification of samples of the hydrochars and untreated biomass in a thermobalance in carbon dioxide, following fast pyrolysis of the samples in a separate fixed-bed batch reactor. Hydrochars were more energy-dense and contained lower concentrations of catalytic metals, particularly K and Na, than the untreated biomass feedstocks. HTC caused a significant reduction in the total release of volatiles and an increase in the yield of char during devolatilization. The bulk of the volatile matter was released at higher devolatilization temperatures for the hydrochars. These trends became more pronounced with increasing HTC temperature from 180 to 260 degrees C. The char components of grape marc and macroalgae became substantially less reactive following HTC. The char component of bagasse became more reactive following HTC at 180 degrees C but became less reactive following HTC at 220 and 260 degrees C. Activation energies for char gasification of HTC-treated (220 degrees C) grape marc, bagasse, and macroalgae in CO2, were 177, 247, and 282 kJ mol(-1), respectively. These values are 92%, 10%, and 52% greater than the values for the untreated biomass.
机译：水热碳化（HTC）可以潜在地改善低价值生物质资源的燃料质量，否则不适合在工业热力和电力应用中使用。研究了HTC预处理对两种农业残留物（葡萄渣和甘蔗渣）和淡水大型藻类的燃烧和气化行为的影响，重点是脱挥发分行为和炭反应性。 HTC是在定制的实验室规模的间歇式反应器中于180、220和260℃这三种温度下进行的，浆液密度为水中干燥生物质的15％w / w。通过动态热重分析来表征收集的产物（碳氢化合物）和未处理的生物质原料的挥发释放行为。炭反应性的特征是在单独的固定床间歇式反应器中快速热解样品后，在二氧化碳的热天平中对炭和未处理生物质进行等温气化。与未经处理的生物质原料相比，碳氢化合物的能量密度更高，并且催化金属（尤其是钾和钠）的浓度更低。 HTC导致挥发分释放过程中挥发物的总释放量大大减少，焦炭收率增加。在较高的脱挥发分温度下，水蒸气释放出大部分挥发性物质。随着HTC温度从180摄氏度升高到260摄氏度，这些趋势变得更加明显。HTC之后，葡萄渣和大型藻类的焦炭成分反应活性大大降低。在180摄氏度的HTC下，蔗渣的焦炭成分变得更具活性，而在220摄氏度和260摄氏度的HTC下，蔗渣的活性变得较低。HTC处理过的（220摄氏度）葡萄渣，蔗渣和大型藻类在CO2中进行焦炭气化的活化能，分别为177、247和282 kJ mol（-1）。这些值比未处理的生物质的值分别高92％，10％和52％。

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  • 来源
    《Energy & fuels》 |2018年第4期|4149-4159|共11页
  • 作者

    Lane Daniel J.; Truong Ewan; Larizza Francesca; Chiew Precilla; de Nys Rocky; van Eyk Philip J.;

  • 作者单位

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;

    James Cook Univ, Coll Sci & Engn, Ctr Macroalgal Resources & Biotechnol, MACRO, Townsville, Qld 4811, Australia;

    Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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