Abstract This paper reports the enhanced production of H2 and polyaromatics during lignite pyrolysis under pressurized entrained-flow conditions. The pyrolysis temperature and pressure ranged between 600−900 °C and 0.1–4.0 MPa, respectively, and were found to greatly influence the yield and composition of pyrolysis products. The results showed that the concentration of H2 in the light gas fraction increased drastically with pyrolysis temperature and pressure, reaching 91.69 vol% at 900 °C and 4.0 MPa, which corresponded to H2 generation of 0.27 m3/kg coal. The yield of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene, biphenylene, fluorene, phenanthrene, pyrene, and fluoranthene was also promoted at elevated pyrolysis temperatures and pressures. The highest PAHs concentration of 90.4 area% in the pyrolysis oil was obtained at 900 °C and 4.0 MPa. It was also found that the changes in the hydrogen distribution under pressurized entrained-flow conditions mainly took place during the secondary pyrolysis reactions. It was postulated that hydrogen was formed via aromatization, condensation, aromatic ring growth mechanism, and direct cleavage reactions. The findings of this study showed that lignite could be efficiently converted to H2-rich gas, PAHs as chemical raw materials, and energy-dense lignite char via a novel poly-generation system based on pressurized entrained-flow pyrolysis.

中文翻译：

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褐煤加压夹带流热解以提高富氢气体和化工原料的生产

摘要 本文报道了加压夹带流条件下褐煤热解过程中 H2 和多环芳烃的产量增加。热解温度和压力分别在 600-900°C 和 0.1-4.0 MPa 之间，并且被发现对热解产物的产率和组成有很大影响。结果表明，轻质气体馏分中 H2 的浓度随着热解温度和压力的增加而急剧增加，在 900 ℃和 4.0 MPa 下达到 91.69 vol%，这对应于 0.27 m3/kg 煤的 H2 生成量。多环芳烃 (PAH) 如萘、联苯、芴、菲、芘和荧蒽的产率也在升高的热解温度和压力下得到提高。PAHs 的最高浓度为 90。在 900 °C 和 4.0 MPa 下获得了 4 面积%的热解油。还发现加压夹带流条件下氢分布的变化主要发生在二次热解反应期间。据推测，氢是通过芳构化、缩合、芳环生长机制和直接裂解反应形成的。这项研究的结果表明，褐煤可以通过基于加压夹带流热解的新型多联产系统有效地转化为富含 H2 的气体、作为化学原料的多环芳烃和能量密集的褐煤炭。缩合、芳环生长机制和直接裂解反应。这项研究的结果表明，褐煤可以通过基于加压夹带流热解的新型多联产系统有效地转化为富含 H2 的气体、作为化学原料的多环芳烃和能量密集的褐煤炭。缩合、芳环生长机制和直接裂解反应。这项研究的结果表明，褐煤可以通过基于加压夹带流热解的新型多联产系统有效地转化为富含 H2 的气体、作为化学原料的多环芳烃和能量密集的褐煤炭。