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首页> 外文期刊>Energy & fuels >Nitrogen in Biomass Char and Its Fate during Combustion: A Model Compound Approach
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Nitrogen in Biomass Char and Its Fate during Combustion: A Model Compound Approach

机译：生物质炭中的氮及其燃烧过程中的命运：一种模型复合方法

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摘要

The emission of nitrogen oxide (NO_x) from biomass combustion is still a concern, even though the nitrogen content of biomass in general is relatively small. To elucidate the pathways of fuel N conversion during combustion processes, many studies have focused on the pyrolysis of amino acids and/or model compounds. In contrast, the model compound char nitrogen and its fate during combustion have not been investigated. The partitioning of nitrogen between the volatiles and char and the type of nitrogen species released during char combustion are very important, because volatile N is better controlled by low NO_x burners than the nitrogen retained in the char. In this study, low heating rate biomass model chars were prepared from a combination of either cellulose or glucose and five of the amino acids most commonly found in terrestrial biomass: L-proline, l-glutamine, L-histidine, L-asparagine, and L-tryptophan. The chars were characterized by X-ray photoelectron spectroscopy (XPS), and the partitioning of nitrogen was also calculated. Furthermore, the impact of protein nitrogen on emissions of nitrogen species from combustion processes was investigated by thermogravimetric analysis-mass spectrometry (TGA-MS) combustion tests, which were used to calculate the char combustion kinetics and conversion of char nitrogen to different nitrogen-containing species. Results indicate that there may be a correlation between the proportion of pyridinic N and pyrrolic N (and/or possibly some quaternary N) in the char and the N precursor. However, further correlations to the N species formed during the char combustion to the N functionalities in the chars were not obtained and merit further investigation. Finally, the char yields obtained and N partitioning of the model chars are comparable to those reported in the literature for biomass chars.
机译：尽管生物质的氮含量通常相对较小，但生物质燃烧产生的氮氧化物（NO_x）排放仍然值得关注。为了阐明燃烧过程中燃料氮转化的途径，许多研究集中在氨基酸和/或模型化合物的热解上。相比之下，尚未研究模型化合物炭氮及其燃烧过程中的命运。氮在挥发物和炭之间的分配以及在炭燃烧过程中释放的氮种类的类型非常重要，因为与残留在焦炭中的氮相比，低NO_x燃烧器可以更好地控制挥发氮。在这项研究中，低热量生物质模型炭是由纤维素或葡萄糖与陆地生物质中最常见的五个氨基酸的组合制备的：L-脯氨酸，l-谷氨酰胺，L-组氨酸，L-天冬酰胺和L-色氨酸。通过X射线光电子能谱（XPS）对炭进行表征，并计算氮的分配。此外，通过热重分析-质谱法（TGA-MS）燃烧试验研究了蛋白质氮对燃烧过程中氮的排放的影响，该燃烧试验用于计算炭燃烧动力学和将炭氮转化为不同的含氮量。种类。结果表明，在焦炭和N前体中，吡啶N和吡咯N（和/或可能是一些季氮）的比例可能存在相关性。然而，未获得与在炭燃烧中形成的N物种与炭中的N官能度的进一步相关性，值得进一步研究。最后，所获得的焦炭产量和模型炭的N分配与文献中有关生物质炭的报道相当。

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  • 来源
    《Energy & fuels》 |2012年第novaadeca期|6482-6491|共10页
  • 作者

    Leilani I. Darvell; Celeste Brindley; Xiaomian C. Baxter; Jenny M. Jones; Alan Williams;

  • 作者单位

    Energy Research Institute, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;

    Department of Chemical Engineering, University of Almeria, 04120 Almeria, Spain;

    Energy Research Institute, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;

    Energy Research Institute, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;

    Energy Research Institute, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;

  • 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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